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Yuexin Han
School of Resources and Civil Engineering, Northeastern University, Shenyang 110819, China

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Review article
Published: 19 July 2021 in Separation and Purification Technology
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Flocculation magnetic separation process is one of the efficient and economical methods to recover fine weakly magnetic iron ore. It is well known that the structural characteristics of mineral flocculants have a significant effect on the flocculation magnetic separation process. Therefore, it is of great practical significance to adjust the structural characteristics and particle size of iron flocs to suit the high-gradient magnetic separation process. In this study, the effect of molecular structure and dosage of the reagents, pulp pH and stirring intensity on the flocculation performance and magnetic separation behavior of ultrafine specular hematite ore were studied by optical microscope observations along with image analysis and floc-magnetic separation experiments, respectively. Besides, the relationship among agglomeration factors, flocculation structure and separation index was established. The interaction mechanism between different starches and minerals was studied by electron scanning microscope (SEM) observation, particle interaction energy calculation, Zeta potential and infrared spectrometric measurements. The results showed that the flocs size gradually increased with the increase of molecular weight, amylopectin content and dosage of the reagent. An appropriate agitation intensity will be helpful to the aggregation of mineral particles, and the new flocculation will be destroyed as the stirring intensity is excessive. Compared with no additives in the separation process, the flocculation-magnetic separation process could increase the recovery rate by 1.5 ∼ 2.0 percentage points on average when the flocs size was about 23 μm. With the increase of amylopectin content and molecular weight, the separation index increased gradually. Compared with tapioca starch, using carboxymethyl tapioca starch as flocculent, the iron grade of concentrate was increased by 1-2 percentage points. The microscopic morphology of the mineral particles showed that the agglomeration of ultrafine specular hematite particles was formed by the polymer bridging of starch in the pulp. The calculation results of interaction energy between particles showed that there was repulsive force between specular hematite and quartz particles due to the existence of repulsive energy of hydration, so the specular hematite and quartz particles were dispersed in the pulp. Zeta potential and FTIR test results showed that these starches can be selectively adsorbed on the specular hematite surface through electrostatic interaction and hydrogen bonding, while there was no obvious adsorption existed between starches and quartz.

ACS Style

Libo Zhou; Yuexin Han; Wenbo Li; Yimin Zhu. Study on polymer-bridging flocculation performance of ultrafine specular hematite ore and its high gradient magnetic separation behavior: Description of floc microstructure and flocculation mechanism. Separation and Purification Technology 2021, 276, 119304 .

AMA Style

Libo Zhou, Yuexin Han, Wenbo Li, Yimin Zhu. Study on polymer-bridging flocculation performance of ultrafine specular hematite ore and its high gradient magnetic separation behavior: Description of floc microstructure and flocculation mechanism. Separation and Purification Technology. 2021; 276 ():119304.

Chicago/Turabian Style

Libo Zhou; Yuexin Han; Wenbo Li; Yimin Zhu. 2021. "Study on polymer-bridging flocculation performance of ultrafine specular hematite ore and its high gradient magnetic separation behavior: Description of floc microstructure and flocculation mechanism." Separation and Purification Technology 276, no. : 119304.

Journal article
Published: 24 May 2021 in Minerals
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The oxidation roasting of carbon-bearing micro-fine gold can eliminate or weaken the robbing effect of carbonaceous materials and clay, and destroy the encapsulation of micro-fine gold. The micropores produced by gas escaping during the roasting process are conducive to the diffusion of leaching agents, thus enhancing the cyanide leaching of gold. In this paper, the influence of the aeration rate during roasting on the leaching rate of fine-grained carbonaceous gold ore and its mechanism were studied using thermodynamic calculations, crystal structure analysis, surface chemical groups and bonds analysis, microporous structure analysis, and surface morphology detection. Under suitable roasting conditions, the carbonaceous and pyrite in the ore are oxidized, while carbonate minerals such as dolomite and calcite as well as clay minerals are decomposed, and the gold-robbing materials lose their activity. The experimental results have theoretical and practical significance for the popularization and application of oxidation roasting technology of fine carbon-bearing gold ore.

ACS Style

Hui Li; Wei Xiao; Jianping Jin; Yuexin Han. Oxidation Roasting of Fine-Grained Carbonaceous Gold Ore: The Effect of Aeration Rate. Minerals 2021, 11, 558 .

AMA Style

Hui Li, Wei Xiao, Jianping Jin, Yuexin Han. Oxidation Roasting of Fine-Grained Carbonaceous Gold Ore: The Effect of Aeration Rate. Minerals. 2021; 11 (6):558.

Chicago/Turabian Style

Hui Li; Wei Xiao; Jianping Jin; Yuexin Han. 2021. "Oxidation Roasting of Fine-Grained Carbonaceous Gold Ore: The Effect of Aeration Rate." Minerals 11, no. 6: 558.

Journal article
Published: 17 May 2021 in Minerals
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In this study, two auxiliary collectors (methyl naphthalene and naphthalene) of molybdenite and the traditional collector (kerosene) were mixed for molybdenite flotation, respectively. According to the selection and analysis of the auxiliary collector, it was found that the surface energy (γC= 44.50 mJ/m2) of the polycyclic aromatic hydrocarbons is very close to that (γS= 42.55 mJ/m2) of the molybdenite {100} surface. Therefore, it can be physically adsorbed onto the molybdenite {100} surface according to the principle of similar compatibility. Batch flotation was conducted on actual ore with the mixed collector, compared with kerosene alone. Batch flotation results showed that the mixed collector at a mass ratio of 95:5 of main collector to auxiliary collector at pH 11.0 improved molybdenite flotation, that is, the Mo recovery was increased by 3–4%. The practical application feasibility of the auxiliary collector was analyzed by the filtration speed of the flotation concentrate and the crystal resolution characteristics of the auxiliary collector. The results show that solid naphthalene (Nap) is easy to crystallize at low temperature and adhere to the surface of the flotation concentrate, resulting in a decrease of filtration velocity, while liquid methylnaphthalene (MNap) does not crystallize at low temperature. These results imply that the mixed collector Kerosene/MNap can generate a superior synergistic effect and achieve better collecting capacity than kerosene alone, resulting in the increase of flotation recovery by 3–4 percentage points. Moreover, the addition of MNap has little negative impact on the subsequent treatment of the product.

ACS Style

Hui Li; Tingshu He; He Wan; Yuexin Han; Yufeng Guo; Jianping Jin. Insights into Selection of the Auxiliary Collector and Its Applicability Analysis for Improving Molybdenite Flotation. Minerals 2021, 11, 528 .

AMA Style

Hui Li, Tingshu He, He Wan, Yuexin Han, Yufeng Guo, Jianping Jin. Insights into Selection of the Auxiliary Collector and Its Applicability Analysis for Improving Molybdenite Flotation. Minerals. 2021; 11 (5):528.

Chicago/Turabian Style

Hui Li; Tingshu He; He Wan; Yuexin Han; Yufeng Guo; Jianping Jin. 2021. "Insights into Selection of the Auxiliary Collector and Its Applicability Analysis for Improving Molybdenite Flotation." Minerals 11, no. 5: 528.

Journal article
Published: 05 April 2021 in Minerals Engineering
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Magnetic matrices are the core components of HGMS systems. In this study, the induced magnetic field distribution characteristics of ellipse magnetic matrices are investigated via numerical simulation. Besides, the effects of magnetic matrices structure parameters and magnetic field distribution characteristics on the cumulative adsorption behavior of magnetic particles are also discussed. First, the numerical simulation results indicated that compared with the simulation results of a single magnetic matrix, the multi-matrix composite system simulation results demonstrate that an interaction of the induced magnetic fields generated by the superposition of magnetic fields is enhanced with the increase in the long axis size or the decrease in the gap between the matrices, heightening the magnetic induction but leading to the magnetic field gradient and magnetic field forces to significantly decrease near the surface of the matrix. And the rapid reduction of the magnetic field forces around the single matrix leads to a reduction in the range of action. However, to a certain extent, the interaction of the induced magnetic fields also will make the scope of the magnetic field force expand with the decrease in the gap between the matrices. The magnetic cumulative adsorption tests prove that it is feasible to infer the adsorption behavior of magnetic particles through the numerical simulation and theoretical calculations. The adsorption morphology of magnetic particles on the surface of magnetic matrices show that the repulsive region of magnetic particles is perpendicular to the direction of magnetic field, and the adsorption region of magnetic particles is parallel to the direction of magnetic field and with the increase of the size of magnetic matrices, the effective adsorption area of magnetic particles on the surface of magnetic matrices decreases gradually. Besides, with the increase of the horizontal gap between adjacent magnetic matrices, the adsorption thickness of magnetic particles on the surface of magnetic matrices decreases. Moreover, with the expansion of the horizontal gap between the adjacent magnetic matrices, the adsorption amount of the magnetic particles gradually decreases due to the decrease of the adsorption area and fill rate. The adsorption amount of magnetic particles will decrease as the long axis size increases when the fill rate of the magnetic matrices is similar.

ACS Style

Libo Zhou; Wenbo Li; Yuexin Han; Yanjun Li; Dongquan Liu. Numerical simulation for magnetic field analysis and magnetic adsorption behavior of ellipse magnetic matrices in HGMS: Prediction magnetic adsorption behavior via numerical simulation. Minerals Engineering 2021, 167, 106876 .

AMA Style

Libo Zhou, Wenbo Li, Yuexin Han, Yanjun Li, Dongquan Liu. Numerical simulation for magnetic field analysis and magnetic adsorption behavior of ellipse magnetic matrices in HGMS: Prediction magnetic adsorption behavior via numerical simulation. Minerals Engineering. 2021; 167 ():106876.

Chicago/Turabian Style

Libo Zhou; Wenbo Li; Yuexin Han; Yanjun Li; Dongquan Liu. 2021. "Numerical simulation for magnetic field analysis and magnetic adsorption behavior of ellipse magnetic matrices in HGMS: Prediction magnetic adsorption behavior via numerical simulation." Minerals Engineering 167, no. : 106876.

Journal article
Published: 26 February 2021 in Minerals
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It is particularly significant to investigate the reduction behavior and existing form of phosphorus in metal and slag phase during coal-based reduction for the efficient development and utilization of high-phosphorus oolitic hematite. The reduction behavior of phosphorus minerals and their existing form in the metal and slag phase during the coal-based reduction of high phosphorus oolitic hematite were systematically investigated using HSC software simulation, thermodynamic calculation, X-ray diffraction (XRD), scanning electron microscopy (SEM), and energy-dispersive spectrometry (EDS). The results show that after Fe2O3 was reduced to metal iron, the reduction of apatite was promoted by providing the most inclined enrichment site of phosphorus (metallographic phase). Phosphorus existed mainly in two forms in the metal phase—one was in the form of Fe3P compound at the boundary of the metal phase, and the other was in the form of solid solution in the metal iron. There were two forms of phosphorus in the slag phase—one was incompletely reacted apatite, and the other was formed as CaO–SiO2–P2O5 solid solution. In the early stage of coal-based reduction, phosphorus in the slag phase mainly existed in the form of apatite, while in the later stage, it mainly existed in the form of CaO–SiO2–P2O5 solid solution.

ACS Style

Jianping Jin; Wentao Zhou; Yongsheng Sun; Yuexin Han; Yanjun Li. Reaction Characteristics and Existing Form of Phosphorus during Coal-Based Reduction of Oolitic Iron Ore. Minerals 2021, 11, 247 .

AMA Style

Jianping Jin, Wentao Zhou, Yongsheng Sun, Yuexin Han, Yanjun Li. Reaction Characteristics and Existing Form of Phosphorus during Coal-Based Reduction of Oolitic Iron Ore. Minerals. 2021; 11 (3):247.

Chicago/Turabian Style

Jianping Jin; Wentao Zhou; Yongsheng Sun; Yuexin Han; Yanjun Li. 2021. "Reaction Characteristics and Existing Form of Phosphorus during Coal-Based Reduction of Oolitic Iron Ore." Minerals 11, no. 3: 247.

Journal article
Published: 17 October 2020 in Minerals Engineering
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To ascertain the mechanism that the ore grinding characteristics were improved by high-voltage pulse discharge (HVPD) pre-treatment, an innovative experiment system was performed on magnetite quartzite. The HVPD pre-treatment improved the −0.074 mm mass fraction in ground products, and the increase in pulse number effectively enhanced the mass fraction. The values of relative grindability (K1 and K2) increased with the pulse number significantly, whereas their value reduced as the grinding fineness and grinding time extended. A laser particle size analysis showed that the distribution of HVPD pre-treatment products was uniform. The particle size distribution and cumulative distribution curves satisfied the lognormal distribution function and power function, respectively. The Brunauer–Emmett–Teller (BET) analysis indicated that the specific surface area, total pore volume, and the porosity of crushed products were improved effectively by the HVPD pre-treatment. The internal ore structure became loosened, resulting in the decline in the mechanical properties of the ore; this is conducive to improve the grinding efficiency. Scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy (EDS) analyses indicated that the grain-boundary breakage was obtained via the HVPD pre-treatment selectivity.

ACS Style

Yonghong Qin; Yuexin Han; Peng Gao; Yanjun Li; Shuai Yuan. Pre-weakening behavior of magnetite quartzite based on high-voltage pulse discharge. Minerals Engineering 2020, 160, 106662 .

AMA Style

Yonghong Qin, Yuexin Han, Peng Gao, Yanjun Li, Shuai Yuan. Pre-weakening behavior of magnetite quartzite based on high-voltage pulse discharge. Minerals Engineering. 2020; 160 ():106662.

Chicago/Turabian Style

Yonghong Qin; Yuexin Han; Peng Gao; Yanjun Li; Shuai Yuan. 2020. "Pre-weakening behavior of magnetite quartzite based on high-voltage pulse discharge." Minerals Engineering 160, no. : 106662.

Journal article
Published: 29 September 2020 in Powder Technology
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The wet grinding of iron ore powder was investigated using a stirred media mill. In this study, the fitting degree of four cumulative undersize distribution functions was compared and the parameters of the four functions were discussed. It was concluded that the particle size distribution (PSD) of grinding products followed well with the Rosin Rammler Benne (RRB) function. In addition, operational parameters such as ball filling rates, stirrer tip speeds and grinding time have been investigated in terms of the width of PSD and specific energy input. The results indicated that slight differences in the width of PSD could be observed at different ball filling rates and stirrer tip speeds. It was also found that increasing the ball filling rate and stirrer tip speed could improve energy efficiency. Furthermore, an equation was established to predict PSD based on the characteristic particle size of the RRB function and size-energy model, which provided a sound fit to the grinding products under various grinding conditions

ACS Style

Wang Guo; Yuexin Han; Yanjun Li; Zhidong Tang. Impact of ball filling rate and stirrer tip speed on milling iron ore by wet stirred mill: Analysis and prediction of the particle size distribution. Powder Technology 2020, 378, 12 -18.

AMA Style

Wang Guo, Yuexin Han, Yanjun Li, Zhidong Tang. Impact of ball filling rate and stirrer tip speed on milling iron ore by wet stirred mill: Analysis and prediction of the particle size distribution. Powder Technology. 2020; 378 ():12-18.

Chicago/Turabian Style

Wang Guo; Yuexin Han; Yanjun Li; Zhidong Tang. 2020. "Impact of ball filling rate and stirrer tip speed on milling iron ore by wet stirred mill: Analysis and prediction of the particle size distribution." Powder Technology 378, no. : 12-18.

Journal article
Published: 22 April 2020 in Minerals Engineering
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To investigate the effect of an amide group on the flotation performance of a fatty acid collector, a novel surfactant, 2-(carbamoylamino) lauric acid (2-CLA), was synthesized by introducing an amide group to the α-C position of lauric acid (LA). Flotation tests on pure quartz indicated that under suitable flotation conditions, pH of 11.5, 50 mg/L of CaCl2, and 100 mg/L of 2-CLA, the quartz recovery of 2-CLA flotation was above 98% and almost unaffected by pulp temperatures between 10 °C and 40 °C. For comparison, the quartz recovery of LA flotation was only 80% at high temperatures above 35 °C. The adsorption mechanisms of 2-CLA on the quartz surface were investigated using Fourier transform-infrared spectra, zeta potential measurements, and X-ray photoelectron spectroscopy analysis, which demonstrated that 2-CLA was adsorbed onto the surface of activated quartz by strong chemisorption and hydrogen bonding. This study also revealed that an additional amide group at the α-C position of fatty acids enhanced both the chemical bonding interaction and hydrogen bonding synergy during the adsorption of 2-CLA on the activated quartz surface.

ACS Style

Wenda Guo; Yimin Zhu; Yuexin Han; Yanjun Li; Shuai Yuan. Flotation performance and adsorption mechanism of a new collector 2-(carbamoylamino) lauric acid on quartz surface. Minerals Engineering 2020, 153, 106343 .

AMA Style

Wenda Guo, Yimin Zhu, Yuexin Han, Yanjun Li, Shuai Yuan. Flotation performance and adsorption mechanism of a new collector 2-(carbamoylamino) lauric acid on quartz surface. Minerals Engineering. 2020; 153 ():106343.

Chicago/Turabian Style

Wenda Guo; Yimin Zhu; Yuexin Han; Yanjun Li; Shuai Yuan. 2020. "Flotation performance and adsorption mechanism of a new collector 2-(carbamoylamino) lauric acid on quartz surface." Minerals Engineering 153, no. : 106343.

Journal article
Published: 23 November 2019 in Powder Technology
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Iron ore tailings have proved to be one of the most hazardous solid wastes. This paper presents an innovative technological method for recycling iron from tailings that involves coupling the magnetic separation preconcentration with fluidized roasting followed by low-intensity magnetic separation. After analyzing the separation index and chemical composition, on the basis of the basic theory, the influences of different conditions on iron recovery were determined. Moreover, a high-quality iron concentrate assaying 65.91% Fe with a recovery rate of 94.60% was obtained under the following optimum parameters: gas flow rate of 500 ml/min, CO concentration of 25%, roasting time of 2.5 min, roasting temperature of 600 °C, grinding fineness of approximately 90 wt% passing 23 μm, and magnetic intensity of 104 kA/m. In addition, XRD analyses and iron chemical phase, optical metallographic microscope and magnetic property measurements revealed that hematite was converted to magnetite successfully after roasting. Using this method, a large amount of iron can be recycled, and this hazardous solid waste can be transformed into a valuable resource. At the same time, this research promotes and provides a research basis for integrated utilization of such solid wastes.

ACS Style

Zhidong Tang; Peng Gao; Yanjun Li; Yuexin Han; Wenbo Li; Stephen Butt; Yahui Zhang. Recovery of iron from hazardous tailings using fluidized roasting coupling technology. Powder Technology 2019, 361, 591 -599.

AMA Style

Zhidong Tang, Peng Gao, Yanjun Li, Yuexin Han, Wenbo Li, Stephen Butt, Yahui Zhang. Recovery of iron from hazardous tailings using fluidized roasting coupling technology. Powder Technology. 2019; 361 ():591-599.

Chicago/Turabian Style

Zhidong Tang; Peng Gao; Yanjun Li; Yuexin Han; Wenbo Li; Stephen Butt; Yahui Zhang. 2019. "Recovery of iron from hazardous tailings using fluidized roasting coupling technology." Powder Technology 361, no. : 591-599.

Journal article
Published: 22 November 2019 in Powder Technology
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Iron ore tailings, which are important secondary resources, have outstanding latent application value in iron recovery. In this study, a pilot-scale experiment on the iron recovery from iron ore tailings was investigated using innovative technology of pre-concentration and suspension magnetization roasting (SMR), followed by magnetic separation and flotation. An iron concentrate containing 58.67% Fe at an iron recovery of 57.82% was obtained under the optimal SMR conditions: a feed rate of 100 kg/h, roasting temperature of 530 °C, CO reducing gas of 3.5 m3/h, and N2 fluidizing gas of 3.0 m3/h. During the SMR process, weakly magnetic hematite and siderite in the iron ore tailings were converted to strongly magnetic magnetite with an average magnetic conversion rate of 81.71%. The SMR reactor exhibited good performance with well-functioning equipment, controllable process parameters, and the production of a high-quality roasted product. This innovative SMR technology is a quantum leap in separating refractory iron ore, which opens up a new approach for the efficient recovery of iron from iron ore tailings.

ACS Style

Yongsheng Sun; Xiaolong Zhang; Yuexin Han; Yanjun Li. A new approach for recovering iron from iron ore tailings using suspension magnetization roasting: A pilot-scale study. Powder Technology 2019, 361, 571 -580.

AMA Style

Yongsheng Sun, Xiaolong Zhang, Yuexin Han, Yanjun Li. A new approach for recovering iron from iron ore tailings using suspension magnetization roasting: A pilot-scale study. Powder Technology. 2019; 361 ():571-580.

Chicago/Turabian Style

Yongsheng Sun; Xiaolong Zhang; Yuexin Han; Yanjun Li. 2019. "A new approach for recovering iron from iron ore tailings using suspension magnetization roasting: A pilot-scale study." Powder Technology 361, no. : 571-580.

Journal article
Published: 09 November 2019 in Applied Surface Science
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To investigate the effect of amide group at the α-C position of lauric acid on quartz flotation, a novel surfactant 2-(carbamoylamino) lauric acid (2-CLA) was synthesized and used as the flotation collector. The 2-CLA was characterized by element analysis, 1H NMR, and FT-IR. Quartz flotation tests showed that the 2-CLA was an anionic collector and flotation recovery was above 98% when the slurry temperature was as low as 10 °C. Zeta potential analysis combined with solution chemistry calculations and contact angle measurements indicated that electrostatic adsorption didn’t occur between collector 2-CLA and activated quartz. Computational simulation based on DFT showed that the adsorption probability of the main species in the pulp on quartz surface was in the order of Ca2+ > Ca(OH)+ > OH− > H2O > 2-CLA−, namely, activator was preferentially adsorbed. Also, it revealed that the strong chemisorption occurred between collector 2-CLA and activated quartz because 3s and 3d orbitals of the Ca2+ gained electrons from 2p orbital of the O atoms in 2-CLA. The CONH2 group containing special O and N atoms could strengthen the chemical bonding adsorption and hydrogen bonding synergy, which lead to the excellent flotation performance of collector 2-CLA even at 10 °C.

ACS Style

Wenda Guo; Yuexin Han; Yimin Zhu; Yanjun Li; Zhidong Tang. Effect of amide group on the flotation performance of lauric acid. Applied Surface Science 2019, 505, 144627 .

AMA Style

Wenda Guo, Yuexin Han, Yimin Zhu, Yanjun Li, Zhidong Tang. Effect of amide group on the flotation performance of lauric acid. Applied Surface Science. 2019; 505 ():144627.

Chicago/Turabian Style

Wenda Guo; Yuexin Han; Yimin Zhu; Yanjun Li; Zhidong Tang. 2019. "Effect of amide group on the flotation performance of lauric acid." Applied Surface Science 505, no. : 144627.

Journal article
Published: 06 November 2019 in Powder Technology
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Flotation kinetics is an excellent tool used to evaluate flotation performance, which is controlled by several factors, such as the particle size, bubble size, and surface property. In this study, we investigated the effects of particle size and ferric hydroxo complex produced by grinding with CB and CIB media on the flotation kinetics of pyrite using Python statistical analysis software and Origin software based on five flotation kinetic models. The results showed that the pyrite particles produced when CB was used as the grinding medium exhibited better cumulative experimental recovery owing to a lower formation of ferric hydroxo complexes. In the case of grinding with CB medium, the first-order flotation kinetic model (ε = ε∞(1 − e−kt)) provided the best fit for the experimental data, whereas the first-order and second-order flotation kinetic model are considered the best in the case of grinding with the CIB medium depending on the experimental conditions. In addition, the particle size and the ferric hydroxo complex were found to be the determining factors of the flotation rate constant (k) and cumulative ultimate recovery (ɛ∞), respectively, in both cases. The intermediate sizes of 10 to 120 μm were found to be the optimal particle sizes for achieving a higher pyrite flotation rate. Less quantity of ferric hydroxo complexes formed on the surface of the pyrite particles, resulting in a higher ɛ∞. The presence of ferric ions inhibited the pyrite flotation recovery and its flotation rate once the pulp pH was sufficient to cause complete precipitation of the ferric hydroxo complex.

ACS Style

Xiaolong Zhang; Yuexin Han; Peng Gao; Yanjun Li; Yongsheng Sun. Effects of particle size and ferric hydroxo complex produced by different grinding media on the flotation kinetics of pyrite. Powder Technology 2019, 360, 1028 -1036.

AMA Style

Xiaolong Zhang, Yuexin Han, Peng Gao, Yanjun Li, Yongsheng Sun. Effects of particle size and ferric hydroxo complex produced by different grinding media on the flotation kinetics of pyrite. Powder Technology. 2019; 360 ():1028-1036.

Chicago/Turabian Style

Xiaolong Zhang; Yuexin Han; Peng Gao; Yanjun Li; Yongsheng Sun. 2019. "Effects of particle size and ferric hydroxo complex produced by different grinding media on the flotation kinetics of pyrite." Powder Technology 360, no. : 1028-1036.

Journal article
Published: 10 October 2019 in Minerals Engineering
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Selective flotation has been considered the most promising strategy for treating chalcopyrite. Grinding, an essential procedure before flotation, has extraordinary significance in chalcopyrite flotation. In this study, the differences between the properties of the products obtained by grinding with cast iron ball (CIB, >3.5% C) and ceramic ball (CB, >90% Al2O3) media were investigated using various techniques: atomic absorption spectrometry, scanning electron microscopy combined with energy dispersive spectrometry, X-ray photoelectron spectroscopy, and contact angle and zeta potential measurements. The performance of chalcopyrite flotation was used as the final factor in determining the characteristics of both the grinding media. The results indicate that the Fe3+ concentration and the pH of the pulp obtained by grinding with CB medium were lower, while the dissolved oxygen content was obviously higher, than those of the pulp obtained by grinding with CIB medium. The Cu2+ concentrations were basically the same under the two grinding media systems. Furthermore, grinding with CB medium yielded products with relatively more even and smoother surface than grinding with CIB medium did. Fewer oxygen-containing floccules, i.e., FeOOH and Cu(OH)2, had formed and scattered on the chalcopyrite surface during grinding with CB medium, and this is mainly attributable to the limited local cell reaction of chalcopyrite alone. Additionally, it was found that better hydrophobicity and a lower iso-electric point of the chalcopyrite surface were achieved by grinding with CB medium. Consequently, grinding with CB medium exhibited better performance in terms of chalcopyrite recovery, which was approximately 16% higher than that obtained by grinding with CIB medium.

ACS Style

Xiaolong Zhang; Yuexin Han; Peng Gao; Yanjun Li. Effects of grinding media on grinding products and flotation performance of chalcopyrite. Minerals Engineering 2019, 145, 106070 .

AMA Style

Xiaolong Zhang, Yuexin Han, Peng Gao, Yanjun Li. Effects of grinding media on grinding products and flotation performance of chalcopyrite. Minerals Engineering. 2019; 145 ():106070.

Chicago/Turabian Style

Xiaolong Zhang; Yuexin Han; Peng Gao; Yanjun Li. 2019. "Effects of grinding media on grinding products and flotation performance of chalcopyrite." Minerals Engineering 145, no. : 106070.

Journal article
Published: 10 July 2019 in Minerals Engineering
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Arsenopyrite is a typical arsenic-containing mineral, and gold is generally hosted by arsenopyrite mineral which adversely affects gold leaching. In this study, a novel environmentally friendly oxidant, chlorine dioxide (ClO2), was used for the first time to efficiently oxidize arsenopyrite under acidic conditions, preventing the adverse effect of arsenopyrite on gold leaching. The addition of solid NaClO2 to acidic arsenopyrite slurry made the oxidation of arsenopyrite feasible for practical purposes, as NaClO2 generates ClO2 under acidic conditions, which then oxidizes arsenopyrite. For a 400 mL sample of arsenopyrite pulp with the initial concentration of 4.07 g/L (0.025 M), the oxidation efficiencies of Fe and As in arsenopyrite reached 94.25% and 85.39%, respectively for NaClO2 and H2SO4 concentrations of 0.125 M each, under magnetic stirring for 1 h at 30 °C in a constant-temperature water bath. At the end of the reaction, both the acidity and oxidation-reduction potential of the system increased, and the ClO2 concentration correspondingly decreased. Chemical composition analysis, X-ray diffraction analysis, particle size distribution measurements, scanning electron microscopy combined with energy dispersive spectrometer analysis, and X-ray photoelectron spectroscopy of arsenopyrite mineral ore and its oxidized residues were performed under different reaction conditions. Analysis results indicated that tiny amorphous precipitates of the oxidation by-products, such as FeAsO4·7H2O, H3AsO3, Fe2(SO4)3·7H2O, and hydrated ferric oxides would cover the surface of unreacted arsenopyrite at low H2SO4 concentration, which prevented the oxidation-reduction reaction from proceeding. As the concentrations of H2SO4 and NaClO2 increased, fine arsenopyrite particles were oxidized first, and ClO2 gradually eroded the surface of the unreacted arsenopyrite minerals to form cracks, defects, and pores, until arsenopyrite was fully oxidized. ClO2 presents several advantages: it can be easily prepared, it is a strong oxidant, and is non-polluting. Therefore, the procedure in this study is expected to be used as a novel method for preventing the effect of arsenopyrite enwrapping gold in refractory gold ores and for directly leaching gold.

ACS Style

Zaizheng Dong; Yimin Zhu; Yuexin Han; Peng Gao; Xiaotian Gu; Yongsheng Sun. Chemical oxidation of arsenopyrite using a novel oxidant—Chlorine dioxide. Minerals Engineering 2019, 139, 105863 .

AMA Style

Zaizheng Dong, Yimin Zhu, Yuexin Han, Peng Gao, Xiaotian Gu, Yongsheng Sun. Chemical oxidation of arsenopyrite using a novel oxidant—Chlorine dioxide. Minerals Engineering. 2019; 139 ():105863.

Chicago/Turabian Style

Zaizheng Dong; Yimin Zhu; Yuexin Han; Peng Gao; Xiaotian Gu; Yongsheng Sun. 2019. "Chemical oxidation of arsenopyrite using a novel oxidant—Chlorine dioxide." Minerals Engineering 139, no. : 105863.

Journal article
Published: 04 July 2019 in Powder Technology
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In this study, based on the characteristics of the rod matrix and the dentate plate magnetic matrix, the thread magnetic matrix is proposed. The numerical simulation technology and model test are utilized to analyze the magnetic field distribution characteristics of the thread magnetic matrix and the effects of structure parameters on magnetic field distribution characteristics are investigated. Firstly, the numerical simulation results indicate that the magnetic induction intensity on the sharp corner of the magnetic matrix is higher, which is inferred to be the magnetic particle adsorption zone, while the valley portion is inferred to be the magnetic particle exclusion zone owing to the low magnetic induction intensity comparing to the sharp corner. Besides, the suitable sharp angle of the magnetic matrix is 60° owing to the high magnetic field force and wide magnetic particle adsorption area and the magnetic particle exclusion zone on the valley region of the threaded magnetic matrix gradually shrink with the increase of the thread pitch and the appropriate thread pitch of the threaded magnetic matrix is 1.0 mm owing to the high magnetic field force. Moreover, the results of the model test indicate that the numerical simulation results are basically consistent with the measured results which prove the numerical simulation results are credible. Furthermore, the adsorption morphology of magnetic particles demonstrates that the magnetic particles are adsorbed on the sharp corner and the magnetic particle exclusion zone in the valley region gradually shrink with the increase of the thread pitch. These results further indicate the inference which the sharp corner of threaded matrix is the adsorption zone of the magnetic particle, while the valley region is the exclusion zone is correct. This study has certain guiding significance for the development of new type magnetic matrices and the application of high gradient magnetic separation technology.

ACS Style

Wenbo Li; Libo Zhou; Yuexin Han; Ruiqing Xu. Numerical simulation and experimental verification for magnetic field analysis of thread magnetic matrix in high gradient magnetic separation. Powder Technology 2019, 355, 300 -308.

AMA Style

Wenbo Li, Libo Zhou, Yuexin Han, Ruiqing Xu. Numerical simulation and experimental verification for magnetic field analysis of thread magnetic matrix in high gradient magnetic separation. Powder Technology. 2019; 355 ():300-308.

Chicago/Turabian Style

Wenbo Li; Libo Zhou; Yuexin Han; Ruiqing Xu. 2019. "Numerical simulation and experimental verification for magnetic field analysis of thread magnetic matrix in high gradient magnetic separation." Powder Technology 355, no. : 300-308.

Reviews
Published: 03 July 2019 in Mineral Processing and Extractive Metallurgy Review
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Improving utilization efficiency of refractory iron ore resources is a common theme for the sustainable development of the world’s steel and iron industry. Magnetization roasting is considered as an effective and typical method for the beneficiation of refractory iron ores. After magnetization roasting, the weakly magnetic iron minerals, including hematite, limonite and siderite, are selectively reduced or oxidized to ferromagnetic magnetite, which is relatively easier to enrich by magnetic separation after liberation pretreatments. The primary magnetization roasting methods include shaft furnace roasting, rotary kiln roasting, fluidized bed roasting, and microwave assisted roasting. This review highlights the developments in magnetization roasting of difficult to treat iron ores, including shaft furnace roasting, rotary kiln roasting, fluidized bed roasting, and microwave assisted roasting in the past decade. Fluidized bed roasting and microwave assisted roasting are considered as the most effective and promising methods, which is essential to be reviewed. Meanwhile, the effective and future magnetization roasting technologies are recommended throughout this review.

ACS Style

Jianwen Yu; Yuexin Han; Yanjun Li; Peng Gao. Recent Advances in Magnetization Roasting of Refractory Iron Ores: A Technological Review in the Past Decade. Mineral Processing and Extractive Metallurgy Review 2019, 41, 349 -359.

AMA Style

Jianwen Yu, Yuexin Han, Yanjun Li, Peng Gao. Recent Advances in Magnetization Roasting of Refractory Iron Ores: A Technological Review in the Past Decade. Mineral Processing and Extractive Metallurgy Review. 2019; 41 (5):349-359.

Chicago/Turabian Style

Jianwen Yu; Yuexin Han; Yanjun Li; Peng Gao. 2019. "Recent Advances in Magnetization Roasting of Refractory Iron Ores: A Technological Review in the Past Decade." Mineral Processing and Extractive Metallurgy Review 41, no. 5: 349-359.

Journal article
Published: 17 April 2019 in Powder Technology
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In this study, an innovative suspension magnetization roasting (SMR) technology was developed and utilized for the recovery of iron from a typical refractory iron ore. The effects of the roasting temperature, CO reducing gas flow rate, N2 fluidizing gas flow rate, and feeding rate on the iron recovery were investigated. Under the optimal roasting conditions, a continuous and stable pilot scale SMR test was conducted for 72 h, and a staged grinding and staged low-intensity magnetic separation (LIMS) process was designed to upgrade the roasted product. The results showed that with the appropriate SMR conditions — a roasting temperature of 520 °C, CO flow rate of 4.0 m3/h, N2 flow rate of 2.0 m3/h, and feeding rate of 100 kg/h — an iron concentrate with a total iron grade (TFe) of 60.18% and iron recovery of 90.17% could be obtained. Compared to the traditional process of shaft furnace magnetization roasting (SFMR) followed by LIMS, the novel technique developed here could improve the TFe and iron recovery of the iron concentrate by 12–14% and 17–22%, respectively, with well-functioning equipment. During the SMR process, hematite and siderite were transformed into magnetite, which enhanced the magnetism of the iron minerals. The utilization of the SMR method has the potential to provide a significant technological advance in the field of refractory iron ore recovery in China and globally.

ACS Style

Xiaolong Zhang; Yuexin Han; Yongsheng Sun; Yanjun Li. Innovative utilization of refractory iron ore via suspension magnetization roasting: A pilot-scale study. Powder Technology 2019, 352, 16 -24.

AMA Style

Xiaolong Zhang, Yuexin Han, Yongsheng Sun, Yanjun Li. Innovative utilization of refractory iron ore via suspension magnetization roasting: A pilot-scale study. Powder Technology. 2019; 352 ():16-24.

Chicago/Turabian Style

Xiaolong Zhang; Yuexin Han; Yongsheng Sun; Yanjun Li. 2019. "Innovative utilization of refractory iron ore via suspension magnetization roasting: A pilot-scale study." Powder Technology 352, no. : 16-24.

Journal article
Published: 01 March 2019 in Minerals Engineering
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Zaizheng Dong; Yimin Zhu; Yuexin Han; Xiaotian Gu; Kai Jiang. Study of pyrite oxidation with chlorine dioxide under mild conditions. Minerals Engineering 2019, 133, 106 -114.

AMA Style

Zaizheng Dong, Yimin Zhu, Yuexin Han, Xiaotian Gu, Kai Jiang. Study of pyrite oxidation with chlorine dioxide under mild conditions. Minerals Engineering. 2019; 133 ():106-114.

Chicago/Turabian Style

Zaizheng Dong; Yimin Zhu; Yuexin Han; Xiaotian Gu; Kai Jiang. 2019. "Study of pyrite oxidation with chlorine dioxide under mild conditions." Minerals Engineering 133, no. : 106-114.

Journal article
Published: 01 March 2019 in Powder Technology
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ACS Style

Zhidong Tang; Yuexin Han; Peng Gao; Erlei Li. Fluidization characteristics of a U-type reduction chamber in a suspension roaster. Powder Technology 2019, 345, 64 -73.

AMA Style

Zhidong Tang, Yuexin Han, Peng Gao, Erlei Li. Fluidization characteristics of a U-type reduction chamber in a suspension roaster. Powder Technology. 2019; 345 ():64-73.

Chicago/Turabian Style

Zhidong Tang; Yuexin Han; Peng Gao; Erlei Li. 2019. "Fluidization characteristics of a U-type reduction chamber in a suspension roaster." Powder Technology 345, no. : 64-73.

Journal article
Published: 14 December 2018 in Minerals Engineering
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Flotation collector α-Bromolauric acid (α-BLA) was used to separate fluorapatite (FAp) from hematite. Flotation performance was presented by pure mineral and mixed binary minerals flotation experiments. The adsorption mechanism of α-BLA on FAp surface was investigated by zeta-potential, FT-IR spectra, and XPS measurements. Flotation results showed that the α-BLA reduced the phosphorous grade of the concentrate to 0.25% and achieved the iron recovery of 91.67% at 19 °C. The mechanism research revealed that the anion of α-BLA interacted with calcium ion of the FAp surface by chemisorption making the FAp mineral float up despite the existence of cornstarch.

ACS Style

Nan Nan; Yimin Zhu; Yuexin Han. Flotation performance and mechanism of α-Bromolauric acid on separation of hematite and fluorapatite. Minerals Engineering 2018, 132, 162 -168.

AMA Style

Nan Nan, Yimin Zhu, Yuexin Han. Flotation performance and mechanism of α-Bromolauric acid on separation of hematite and fluorapatite. Minerals Engineering. 2018; 132 ():162-168.

Chicago/Turabian Style

Nan Nan; Yimin Zhu; Yuexin Han. 2018. "Flotation performance and mechanism of α-Bromolauric acid on separation of hematite and fluorapatite." Minerals Engineering 132, no. : 162-168.