This page has only limited features, please log in for full access.

Unclaimed
Zheng-Qi Guo
School of Minerals Processing and Bioengineering, Central South University, Changsha, China

Basic Info

Basic Info is private.

Honors and Awards

The user has no records in this section


Career Timeline

The user has no records in this section.


Short Biography

The user biography is not available.
Following
Followers
Co Authors
The list of users this user is following is empty.
Following: 0 users

Feed

Original paper
Published: 17 July 2021 in Journal of Iron and Steel Research International
Reads 0
Downloads 0

The influence of basicity on the metallurgical performances and reduction characteristics of fired super high-grade magnetite pellets under the simulated shaft furnace gas conditions was investigated. The fired pellets in the basicity range of 0.09 (natural basicity) to 1.00 show superior reducibility and low-temperature disintegration performance. However, in the basicity range of 0.20–0.80, the abnormal swelling of the fired pellets occurs. Improving basicity from 0.09 to 0.40 promotes the generation of low melting point slag phases and lower porosity of fired pellets, and accelerates the growth and densification of hematite crystals, impeding the reduction of hematite particles and the formation of metallic iron shell. In addition, the slags that distribute between the hematite particles absorb the reduction stresses by increased distances between the particles during the reduction process, which leads to the large reduction swelling of pellets.

ACS Style

Feng Zhang; De-Qing Zhu; Jian Pan; Zheng-Qi Guo; Meng-Jie Xu. Influence of basicity on metallurgical performances of fired super high-grade magnetite pellets in hydrogen-rich gases. Journal of Iron and Steel Research International 2021, 1 -11.

AMA Style

Feng Zhang, De-Qing Zhu, Jian Pan, Zheng-Qi Guo, Meng-Jie Xu. Influence of basicity on metallurgical performances of fired super high-grade magnetite pellets in hydrogen-rich gases. Journal of Iron and Steel Research International. 2021; ():1-11.

Chicago/Turabian Style

Feng Zhang; De-Qing Zhu; Jian Pan; Zheng-Qi Guo; Meng-Jie Xu. 2021. "Influence of basicity on metallurgical performances of fired super high-grade magnetite pellets in hydrogen-rich gases." Journal of Iron and Steel Research International , no. : 1-11.

Original paper
Published: 08 April 2020 in Journal of Iron and Steel Research International
Reads 0
Downloads 0

For improving the strength of pellets made of ultrafine and super-high-grade magnetite concentrates, the influence of basicity (CaO/SiO2 ratio) on the roasting and consolidation of pellets was investigated. The results showed that with the basicity of pellets increasing from 0.09 to 0.60, the compressive strength of both preheated and roasted pellets achieved an evident improvement from 502 and 2519 to 549 and 3096 N/pellet, respectively; meanwhile, the roasting time decreased from 15 to 9 min. The low-viscosity liquid phases were easily generated in fired pellets at the basicity range of 0.40–0.60 under the roasting temperature of 1240 °C, filled the voids between hematite particles and tightened the bonding among particles, effectively restraining the generation of concentric cracks and decreasing the porosity of fired pellets; low-viscosity liquid phases facilitated the solid diffusion of hematite, leading to the formation of coarse hematite crystals and thicker connecting necks.

ACS Style

Feng Zhang; De-Qing Zhu; Jian Pan; Zheng-Qi Guo; Meng-Jie Xu. Improving roasting performance and consolidation of pellets made of ultrafine and super-high-grade magnetite concentrates by modifying basicity. Journal of Iron and Steel Research International 2020, 27, 770 -781.

AMA Style

Feng Zhang, De-Qing Zhu, Jian Pan, Zheng-Qi Guo, Meng-Jie Xu. Improving roasting performance and consolidation of pellets made of ultrafine and super-high-grade magnetite concentrates by modifying basicity. Journal of Iron and Steel Research International. 2020; 27 (7):770-781.

Chicago/Turabian Style

Feng Zhang; De-Qing Zhu; Jian Pan; Zheng-Qi Guo; Meng-Jie Xu. 2020. "Improving roasting performance and consolidation of pellets made of ultrafine and super-high-grade magnetite concentrates by modifying basicity." Journal of Iron and Steel Research International 27, no. 7: 770-781.

Journal article
Published: 25 February 2019 in Powder Technology
Reads 0
Downloads 0

An innovative technology for direct reduction-magnetic separation with the addition of Na2CO3 and CaO was studied to upgrade copper slag assaying 40.33% Fetotal and 0.65% Cu. It is difficult to recover iron and copper from the slag by direct reduction since the iron mainly occurs in fayalite and the copper exists in copper sulfide. Additives such as Na2CO3 and CaO has been proven to be capable of reinforcing the reduction of refractory iron ore in many papers. In this study, the effect of Na2CO3 dosage and binary basicity (CaO/SiO2) on the coal-based reduction of copper slag was investigated. The results show that the addition of CaO at 0.5 basicity and 8% sodium carbonate, the recovery of the iron and copper can be significantly improved to 94.3% and 86.5%, respectively. Meanwhile, the iron and copper content of magnetic concentrate are maintained at 90.5% and 1.2%, respectively, which can be used as burden for smelting of weathering steel, and the nonmagnetic tailings obtained in this process can be applied as raw materials in cement and industry, and the dust collected from the direct reduction process contains 50.65% Zn and 8.56% Pb at a recovery of 99.16% and 91.89%, and can be used as feed for extraction of Zn and Pb.

ACS Style

Siwei Li; Jian Pan; Deqing Zhu; Zhengqi Guo; Jiwei Xu; Jianlei Chou. A novel process to upgrade the copper slag by direct reduction-magnetic separation with the addition of Na2CO3 and CaO. Powder Technology 2019, 347, 159 -169.

AMA Style

Siwei Li, Jian Pan, Deqing Zhu, Zhengqi Guo, Jiwei Xu, Jianlei Chou. A novel process to upgrade the copper slag by direct reduction-magnetic separation with the addition of Na2CO3 and CaO. Powder Technology. 2019; 347 ():159-169.

Chicago/Turabian Style

Siwei Li; Jian Pan; Deqing Zhu; Zhengqi Guo; Jiwei Xu; Jianlei Chou. 2019. "A novel process to upgrade the copper slag by direct reduction-magnetic separation with the addition of Na2CO3 and CaO." Powder Technology 347, no. : 159-169.

Journal article
Published: 29 September 2018 in Powder Technology
Reads 0
Downloads 0

High MgO content and the dehydroxylation of laterite ore particles lead to poor compressive strength of fired chromium-nickel bearing iron ore pellets at natural basicity. For improving the compressive strength of the fired chromium‑nickel bearing iron ore pellets, burnt lime was applied as the additive to improve the pellet structure. Results showed that with an increase in quaternary basicity, the compressive strength of fired pellets was enhanced obviously. The optimum basicity of fired chromium-nickel bearing iron ore pellets is suggested at 1.15. Under the optimal test conditions, the compressive strength of fired pellets with natural basicity is only 607 N/pellet, but the compressive strength of fired pellets reaches 1991 N/pellet at basicity of 1.15. The structure of fired chromium-nickel pellets at 1.15 basicity greatly depends on the liquid bonding phases among chromite, hematite and enstatite particles, which are composed of kirschsteinite, SFCA and glass, and amount to 19.27% in fired pellets. The liquid bonding phases fill in the voids among mineral particles and interconnect them to form the intertwined structure, which increases the shrinkage and significantly improves the compression strength of fired pellets.

ACS Style

Feng Zhang; Deqing Zhu; Jian Pan; Zhengqi Guo; Congcong Yang. Effect of basicity on the structure characteristics of chromium-nickel bearing iron ore pellets. Powder Technology 2018, 342, 409 -417.

AMA Style

Feng Zhang, Deqing Zhu, Jian Pan, Zhengqi Guo, Congcong Yang. Effect of basicity on the structure characteristics of chromium-nickel bearing iron ore pellets. Powder Technology. 2018; 342 ():409-417.

Chicago/Turabian Style

Feng Zhang; Deqing Zhu; Jian Pan; Zhengqi Guo; Congcong Yang. 2018. "Effect of basicity on the structure characteristics of chromium-nickel bearing iron ore pellets." Powder Technology 342, no. : 409-417.

Original paper
Published: 17 May 2018 in Journal of Iron and Steel Research International
Reads 0
Downloads 0

Indian hematite fines are normally characterized by high iron grade and minor impurities, which are usually used for sinter fines. With macroscale operations technology of blast furnace in Indian, pellets, as a kind of high-quality materials, attract more and more attention. However, the hematite fines possess the coarse size. Hence, they inevitably need to be further finely ground for pelletizing before balling. The grinding behavior of Indian hematite fines was revealed by conducting the ball milling tests and determining the Bond ball mill work index (Wi). The results show that Indian hematite fines have an excellent grindability with Wi of only 7.40–7.73 kWh/t, indicating that ball milling is an economically viable way to pretreat Indian hematite fines. Nonetheless, due to poor sedimentation and filtering properties of wet ground products, the dry ball milling is more appropriate to process Indian hematite fines. In addition, the superior quality green balls can be manufactured with dry ground products under the conditions of 0.5% bentonite dosage, 7.5% moisture and balling for 12 min, which further confirmed that the recommended pellet feed preparation technique is reasonable.

ACS Style

De-Qing Zhu; Zheng-Qi Guo; Jian Pan; Zhao-Yuan Wang. Insights on pretreatment of Indian hematite fines in grate–kiln pelletizing process: the choice of grinding processes. Journal of Iron and Steel Research International 2018, 25, 506 -514.

AMA Style

De-Qing Zhu, Zheng-Qi Guo, Jian Pan, Zhao-Yuan Wang. Insights on pretreatment of Indian hematite fines in grate–kiln pelletizing process: the choice of grinding processes. Journal of Iron and Steel Research International. 2018; 25 (5):506-514.

Chicago/Turabian Style

De-Qing Zhu; Zheng-Qi Guo; Jian Pan; Zhao-Yuan Wang. 2018. "Insights on pretreatment of Indian hematite fines in grate–kiln pelletizing process: the choice of grinding processes." Journal of Iron and Steel Research International 25, no. 5: 506-514.

Journal article
Published: 01 April 2018 in Powder Technology
Reads 0
Downloads 0

The mechanism of composite additive in promoting reduction of copper slag was revealed. In this paper, the kinetic study of direct reduction of copper slag (CS) was studied by isothermal method, and the phase transformation and growth behaviors of metallic iron particles during reduction process were clarified by X-ray diffraction, Scanning Electron Microscopy, and Energy Dispersive X-ray Spectroscopy analyses. The results indicated that the apparent activation energy of reduction reactions of iron oxides within CS sample was decreased from 71.27 KJ/mol to 49.86 KJ/mol with the addition of 15% composite additive, and the mean particle size of metallic iron particles increased from 9.2 μm to 35.2 μm. The composite additive can promote the reduction of iron minerals and induce the adequate growth of metallic iron particles, which is beneficial for iron and copper recovery in magnetite separation process.

ACS Style

Zhengqi Guo; Jian Pan; Deqing Zhu; Yang Congcong. Mechanism of composite additive in promoting reduction of copper slag to produce direct reduction iron for weathering resistant steel. Powder Technology 2018, 329, 55 -64.

AMA Style

Zhengqi Guo, Jian Pan, Deqing Zhu, Yang Congcong. Mechanism of composite additive in promoting reduction of copper slag to produce direct reduction iron for weathering resistant steel. Powder Technology. 2018; 329 ():55-64.

Chicago/Turabian Style

Zhengqi Guo; Jian Pan; Deqing Zhu; Yang Congcong. 2018. "Mechanism of composite additive in promoting reduction of copper slag to produce direct reduction iron for weathering resistant steel." Powder Technology 329, no. : 55-64.

Article
Published: 04 May 2017 in International Journal of Minerals, Metallurgy, and Materials
Reads 0
Downloads 0

Indian hematite fines normally have a high iron grade and minor impurities; they are usually used as sinter fines for feeding into a blast furnace. In this work, the grindability properties of two kinds of Indian hematite fines and the roasting behaviors and induration characteristics of pellets made from these fines were revealed through experiments involving dry ball milling and small-scale and pilot-scale tests. In addition, the microstructures of the particles of ground India hematite fines and fired pellets were investigated using optical microscopy. On the basis of the results, a grate-kiln production line with an annual output of 1.2 Mt of oxidized pellets was established in India. This pellet plant operates stably and reliably, further confirming that preparing high-quality pellets with Indian hematite fines pretreated by dry ball milling is an industrially feasible process.

ACS Style

De-Qing Zhu; Feng Zhang; Zheng-Qi Guo; Jian Pan; Wei Yu. Grate-kiln pelletization of Indian hematite fines and its industrial practice. International Journal of Minerals, Metallurgy, and Materials 2017, 24, 473 -485.

AMA Style

De-Qing Zhu, Feng Zhang, Zheng-Qi Guo, Jian Pan, Wei Yu. Grate-kiln pelletization of Indian hematite fines and its industrial practice. International Journal of Minerals, Metallurgy, and Materials. 2017; 24 (5):473-485.

Chicago/Turabian Style

De-Qing Zhu; Feng Zhang; Zheng-Qi Guo; Jian Pan; Wei Yu. 2017. "Grate-kiln pelletization of Indian hematite fines and its industrial practice." International Journal of Minerals, Metallurgy, and Materials 24, no. 5: 473-485.

Book chapter
Published: 09 February 2017 in Proceedings of the International Conference on Martensitic Transformations: Chicago
Reads 0
Downloads 0

Iron mainly exists as the magnetite and fayalite, while copper is primarily dispersed in the form of fine matte particles in the copper slag , which is difficult to recover by conventional separation techniques. In this paper, the feasibility of an integrated technological route to improve beneficiation of copper and iron components from copper slag through the modification of molten slag was investigated, and the results shows that: the copper grade of rougher copper concentrate was increased from 6.43 to 11.04%, iron recovery from magnetic separation was increased significantly from 32.40 to 63.36%, and other evaluation indexes were changed slightly, in comparison with unmodified copper slag. Meanwhile, the grains of the target minerals in the modified slag grew considerably to a mean size >50 μm after slow cooling. Ultimately, the beneficiation efficiency of copper and iron was improved because of the ease with which the target minerals were liberated.

ACS Style

Zheng-Qi Guo; De-Qing Zhu; Jian Pan; Feng Zhang. Improving Separation of Cu–Fe from Copper Slag by Modification of the Molten Slag. Proceedings of the International Conference on Martensitic Transformations: Chicago 2017, 269 -278.

AMA Style

Zheng-Qi Guo, De-Qing Zhu, Jian Pan, Feng Zhang. Improving Separation of Cu–Fe from Copper Slag by Modification of the Molten Slag. Proceedings of the International Conference on Martensitic Transformations: Chicago. 2017; ():269-278.

Chicago/Turabian Style

Zheng-Qi Guo; De-Qing Zhu; Jian Pan; Feng Zhang. 2017. "Improving Separation of Cu–Fe from Copper Slag by Modification of the Molten Slag." Proceedings of the International Conference on Martensitic Transformations: Chicago , no. : 269-278.

Erratum
Published: 23 August 2016 in JOM
Reads 0
Downloads 0
ACS Style

Zhengqi Guo; Jian Pan; Deqing Zhu; Feng Zhang. Erratum to: Mechanism of Mineral Phase Reconstruction for Improving the Beneficiation of Copper and Iron from Copper Slag. JOM 2016, 68, 2713 -2713.

AMA Style

Zhengqi Guo, Jian Pan, Deqing Zhu, Feng Zhang. Erratum to: Mechanism of Mineral Phase Reconstruction for Improving the Beneficiation of Copper and Iron from Copper Slag. JOM. 2016; 68 (10):2713-2713.

Chicago/Turabian Style

Zhengqi Guo; Jian Pan; Deqing Zhu; Feng Zhang. 2016. "Erratum to: Mechanism of Mineral Phase Reconstruction for Improving the Beneficiation of Copper and Iron from Copper Slag." JOM 68, no. 10: 2713-2713.

Journal article
Published: 02 August 2016 in JOM
Reads 0
Downloads 0

To maximize the recovery of iron and copper from copper slag, the modification process by adding a compound additive (a mixture of hematite, pyrite and manganous oxide) and optimizing the cooling of the slag was studied. The phase reconstruction mechanism of the slag modification process was revealed by thermodynamic calculations, x-ray diffraction, optical microscopy and scanning electron microscopy. The results show that the synergy between the burnt lime and the compound additive promotes the generation of target minerals, such as magnetite and copper matte. In addition, the multifunctional compound additive is able to improve the fluidity of the molten slag, which facilitates the coalescence and growth of fine particles of the target minerals. As a result, the percentage of iron distributed in the form of magnetite increased from 32.9% to 65.1%, and that of the copper exiting in the form of metallic copper and copper sulfide simultaneously increased from 80.0% to 90.3%. Meanwhile, the grains of the target minerals in the modified slag grew markedly to a mean size of over 50 μm after slow cooling. Ultimately, the beneficiation efficiency of copper and iron was improved because of the ease with which the target minerals could be liberated.

ACS Style

Zhengqi Guo; Deqing Zhu; Jan Pan; Feng Zhang. Mechanism of Mineral Phase Reconstruction for Improving the Beneficiation of Copper and Iron from Copper Slag. JOM 2016, 68, 2341 -2348.

AMA Style

Zhengqi Guo, Deqing Zhu, Jan Pan, Feng Zhang. Mechanism of Mineral Phase Reconstruction for Improving the Beneficiation of Copper and Iron from Copper Slag. JOM. 2016; 68 (9):2341-2348.

Chicago/Turabian Style

Zhengqi Guo; Deqing Zhu; Jan Pan; Feng Zhang. 2016. "Mechanism of Mineral Phase Reconstruction for Improving the Beneficiation of Copper and Iron from Copper Slag." JOM 68, no. 9: 2341-2348.

Journal article
Published: 26 July 2016 in Ironmaking & Steelmaking
Reads 0
Downloads 0

In the paper, the pre-treatment of fine Brazilian specularite concentrates with high iron grade and low impurities through pre-briquetting was proposed to improve the granulation and sintering performance of blends comprising some 30% specularite concentrates. The results show that the excellent sintering indexes are attained as follows in pot tests: productivity of 1.64 t m−2 h−1, tumble index of 59.87% and solid fuel consumption of 71.64 kg t−1 under the optimal conditions. Compared with traditional sintering process, productivity and tumble index were increased by 13.88 and 3.5%, respectively, and solid fuel consumption decreased by 4.82 kg t−1. The RI and RDI−3.15 reach 83.95 and 35.02%, respectively, which are superior for blast furnace. The mechanism of the pre-treatment of the specularite concentrates was demonstrated that better permeability was achieved by coarsening granule, more calcium ferrite was formed by basicity segregation and separation addition of coke.

ACS Style

D. Zhu; Z. Guo; J. Pan; F. Zhang. A study of pre-briquetting granulation sintering of the mixtures with high ratio of Brazilian specularite concentrate. Ironmaking & Steelmaking 2016, 43, 721 -729.

AMA Style

D. Zhu, Z. Guo, J. Pan, F. Zhang. A study of pre-briquetting granulation sintering of the mixtures with high ratio of Brazilian specularite concentrate. Ironmaking & Steelmaking. 2016; 43 (10):721-729.

Chicago/Turabian Style

D. Zhu; Z. Guo; J. Pan; F. Zhang. 2016. "A study of pre-briquetting granulation sintering of the mixtures with high ratio of Brazilian specularite concentrate." Ironmaking & Steelmaking 43, no. 10: 721-729.

Journal article
Published: 24 May 2016 in Metals
Reads 0
Downloads 0

In this paper, an effective method was developed to remove phosphorus and upgrade iron from high phosphorus oolitic hematite ore by high temperature flash reduction—a wet magnetic separation process. A thermodynamic analysis of iron and phosphorus mineral reactions and experiments with Fe-P separation process were performed, and the mechanism of phosphorus removal and beneficiation of iron is discussed as well. The results show that under the proper conditions, a final metallic iron powder assaying over 91% Fe and 0.25% P was obtained with iron recovery of 90% and phosphorus removal rate of 91.79% using the new process, indicating that the high temperature flash reduction process is a feasible and efficient way to process this kind of complex and refractory iron ore. Moreover, sodium sulfate is found to be capable of improving the removal of phosphorus and the upgrading of iron, as well as enhancing the growth of metallic iron grains significantly for higher recovery of iron.

ACS Style

Deqing Zhu; Zhengqi Guo; Jian Pan; Feng Zhang. Synchronous Upgrading Iron and Phosphorus Removal from High Phosphorus Oolitic Hematite Ore by High Temperature Flash Reduction. Metals 2016, 6, 123 .

AMA Style

Deqing Zhu, Zhengqi Guo, Jian Pan, Feng Zhang. Synchronous Upgrading Iron and Phosphorus Removal from High Phosphorus Oolitic Hematite Ore by High Temperature Flash Reduction. Metals. 2016; 6 (6):123.

Chicago/Turabian Style

Deqing Zhu; Zhengqi Guo; Jian Pan; Feng Zhang. 2016. "Synchronous Upgrading Iron and Phosphorus Removal from High Phosphorus Oolitic Hematite Ore by High Temperature Flash Reduction." Metals 6, no. 6: 123.