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Early invasive growth along specific anatomical structures, especially the white matter tract, is regarded as one of the main causes of poor therapeutic outcome of people with gliomas. We show that some glioma stem cells (GSCs) are preferentially located along white matter tracts, which exhibit a demyelinated phenotype, at the invasive frontier of glioma tissues. These GSCs are CD133Notch1, whereas the nerve fibers express the Notch ligand Jagged1. The Notch-induced transcription factor Sox9 promotes the transcription of SOX2 and the methylation level of the NOTCH1 promoter is attenuated by the upregulation of SOX2 to reinforce NOTCH1 expression in GSCs. This positive-feedback loop in a cohort of glioma subjects is correlated with a poor prognosis. Inhibition of Notch signaling attenuates the white-matter-tract tropism of GSCs. These findings provide evidence indicating that the NOTCH1-SOX2 positive-feedback loop controls GSC invasion along white matter tracts.
Jun Wang; Sen-Lin Xu; Jiang-Jie Duan; Liang Yi; Yu-Feng Guo; Yu Shi; Lin Li; Ze-Yu Yang; Xue-Mei Liao; Jiao Cai; Yan-Qi Zhang; Hua-Liang Xiao; Li Yin; Hao Wu; Jing-Na Zhang; Sheng-Qing Lv; Qing-Kai Yang; Xiao-Jun Yang; Tao Jiang; Xia Zhang; Xiu-Wu Bian; Shi-Cang Yu. Invasion of white matter tracts by glioma stem cells is regulated by a NOTCH1–SOX2 positive-feedback loop. Nature Neuroscience 2018, 22, 91 -105.
AMA StyleJun Wang, Sen-Lin Xu, Jiang-Jie Duan, Liang Yi, Yu-Feng Guo, Yu Shi, Lin Li, Ze-Yu Yang, Xue-Mei Liao, Jiao Cai, Yan-Qi Zhang, Hua-Liang Xiao, Li Yin, Hao Wu, Jing-Na Zhang, Sheng-Qing Lv, Qing-Kai Yang, Xiao-Jun Yang, Tao Jiang, Xia Zhang, Xiu-Wu Bian, Shi-Cang Yu. Invasion of white matter tracts by glioma stem cells is regulated by a NOTCH1–SOX2 positive-feedback loop. Nature Neuroscience. 2018; 22 (1):91-105.
Chicago/Turabian StyleJun Wang; Sen-Lin Xu; Jiang-Jie Duan; Liang Yi; Yu-Feng Guo; Yu Shi; Lin Li; Ze-Yu Yang; Xue-Mei Liao; Jiao Cai; Yan-Qi Zhang; Hua-Liang Xiao; Li Yin; Hao Wu; Jing-Na Zhang; Sheng-Qing Lv; Qing-Kai Yang; Xiao-Jun Yang; Tao Jiang; Xia Zhang; Xiu-Wu Bian; Shi-Cang Yu. 2018. "Invasion of white matter tracts by glioma stem cells is regulated by a NOTCH1–SOX2 positive-feedback loop." Nature Neuroscience 22, no. 1: 91-105.
With the increase of hot metal ratio in electric arc furnace (EAF) steelmaking process, physical sensible heat and chemical latent heat of gas increased significantly. As EAF raw material condition is similar to basic oxygen furnace (BOF), and the condition of BOF gas waste heat utilization technology is mature, waste heat utilization technology in EAF steelmaking will be getting more and more attention. Scrap preheating and steam production as mature technology is the main way of EAF gas waste heat utilization. Power generation converted high temperature steam to electricity will further improve the EAF gas utilization value. The previous ways are to recycle physical sensible heat of EAF gas. To use chemical latent heat of gas, the secondary combustion technology is usually adopted to make CO fully burn into CO2. Coal gas production can fully recycle the chemical latent heat of gas theoretically, which is higher efficiency than other ways. Coal gas production needs a stable steelmaking process to stabilize high temperature gas. And the way need to develop EAF sealing technology, oxygen removal technology and gas purification technology, to make gas content meet the requirements of coal gas production in EAF steelmaking process.
Ling-Zhi Yang; Tao Jiang; Guang-Hui Li; Yu-Feng Guo; Feng Chen. Present Situation and Prospect of EAF Gas Waste Heat Utilization Technology. High Temperature Materials and Processes 2018, 37, 357 -363.
AMA StyleLing-Zhi Yang, Tao Jiang, Guang-Hui Li, Yu-Feng Guo, Feng Chen. Present Situation and Prospect of EAF Gas Waste Heat Utilization Technology. High Temperature Materials and Processes. 2018; 37 (4):357-363.
Chicago/Turabian StyleLing-Zhi Yang; Tao Jiang; Guang-Hui Li; Yu-Feng Guo; Feng Chen. 2018. "Present Situation and Prospect of EAF Gas Waste Heat Utilization Technology." High Temperature Materials and Processes 37, no. 4: 357-363.
A novel process to prepare titanium dioxide from Ti-bearing electric furnace slag by NH4HF2-HF leaching and hydrolyzing process has been developed. In this present study, the effects of [NH4(+)]/[F] mXolar ratio, leaching temperature, [F] concentration, liquid/solid mass ratio, leaching time on the Ti extraction, and the phase transformations have been investigated to reveal the leaching mechanism of Ti-bearing electric furnace slag in NH4HF2-HF solution. In the NH4HF2-HF leaching process, the MgTi2O5 and Al2TiO5 are converted to TiF6(2-) and Mg-Al-bearing precipitate. Ti extraction rate reached 98.84% under the optimal conditions. In addition, 98.25% iron ions can be removed in the presence of NaCl prior to hydrolysis process. The effects of pH and temperature on the selective hydrolysis of TiF6(2-) during hydrolysis process were also studied. In the hydrolysis process, the TiF6(2-) is converted to (NH4)2TiOF4. By calcination, high grade TiO2 powder with its purity of 99.88% was obtained, using which the products, well crystallized anatase and rutile, were obtained through roasting at 800°C and 1000°C, respectively.
Fuqiang Zheng; Yufeng Guo; Guanzhou Qiu; Feng Chen; Shuai Wang; Yulei Sui; Tao Jiang; Lingzhi Yang. A novel process for preparation of titanium dioxide from Ti-bearing electric furnace slag: NH4HF2-HF leaching and hydrolyzing process. Journal of Hazardous Materials 2018, 344, 490 -498.
AMA StyleFuqiang Zheng, Yufeng Guo, Guanzhou Qiu, Feng Chen, Shuai Wang, Yulei Sui, Tao Jiang, Lingzhi Yang. A novel process for preparation of titanium dioxide from Ti-bearing electric furnace slag: NH4HF2-HF leaching and hydrolyzing process. Journal of Hazardous Materials. 2018; 344 ():490-498.
Chicago/Turabian StyleFuqiang Zheng; Yufeng Guo; Guanzhou Qiu; Feng Chen; Shuai Wang; Yulei Sui; Tao Jiang; Lingzhi Yang. 2018. "A novel process for preparation of titanium dioxide from Ti-bearing electric furnace slag: NH4HF2-HF leaching and hydrolyzing process." Journal of Hazardous Materials 344, no. : 490-498.
The application of the bottom-blowing in the steelmaking process of EAF can effectively shorten the mixing time of the molten bath, accelerate the removal of carbon, phosphorus and sulfur, and improve the production efficiency and product quality. Information about the effects of changing molten steel velocity during the smelting process would help to accurately model molten bath dynamics. In this study, numerical simulation software was employed to simulate the EAF steelmaking process under variable eccentric bottom-blowing gas flow situations. Velocity field data were obtained for the different bottom-blowing schemes. When other nozzles’ bottom-blowing gas flow rates were maintained at 133 L/min, the average velocity of molten steel in EBT (Eccentric Bottom Tapping Area) was increased from 2.8 × 10−3 to 3.4 × 10−3 m/s with the eccentric gas flow rate of bottom-blowing from 100 to 267 L/min, the average velocity of molten steel in the bath increased from 4.3 × 10−3 to 4.6 × 10−3 m/s with the eccentric gas flow rate of bottom-blowing from 100 to 267 L/min.
Ze-Shi Yang; Ling-Zhi Yang; Yu-Feng Guo; Guang-Sheng Wei; Ting Cheng. Simulation of Velocity Field of Molten Steel in Electric Arc Furnace Steelmaking. Proceedings of the International Conference on Martensitic Transformations: Chicago 2018, 69 -79.
AMA StyleZe-Shi Yang, Ling-Zhi Yang, Yu-Feng Guo, Guang-Sheng Wei, Ting Cheng. Simulation of Velocity Field of Molten Steel in Electric Arc Furnace Steelmaking. Proceedings of the International Conference on Martensitic Transformations: Chicago. 2018; ():69-79.
Chicago/Turabian StyleZe-Shi Yang; Ling-Zhi Yang; Yu-Feng Guo; Guang-Sheng Wei; Ting Cheng. 2018. "Simulation of Velocity Field of Molten Steel in Electric Arc Furnace Steelmaking." Proceedings of the International Conference on Martensitic Transformations: Chicago , no. : 69-79.
Yulei Sui; Qingxia Liu; Tao Jiang; Yufeng Guo. Synthesis of nano-TiO2 photocatalysts with tunable Fe doping concentration from Ti-bearing tailings. Applied Surface Science 2018, 428, 1149 -1158.
AMA StyleYulei Sui, Qingxia Liu, Tao Jiang, Yufeng Guo. Synthesis of nano-TiO2 photocatalysts with tunable Fe doping concentration from Ti-bearing tailings. Applied Surface Science. 2018; 428 ():1149-1158.
Chicago/Turabian StyleYulei Sui; Qingxia Liu; Tao Jiang; Yufeng Guo. 2018. "Synthesis of nano-TiO2 photocatalysts with tunable Fe doping concentration from Ti-bearing tailings." Applied Surface Science 428, no. : 1149-1158.
The oxidation process of Panzhihua titanium slag was investigated in this paper. According to the oxidation thermodynamics analysis of Ti-bearing minerals and iron-bearing mineral, the oxidation mechanism in the oxidation roasting process was proposed. The DSC/DTG/TG analysis of titanium slag oxidation, the effects of oxidation temperature on the mineral phase transformation, microstructure, and element distribution of the oxidized titanium slag were investigated. The results indicated that the transformation of Ti-bearing mineral into rutile was effectively increased with the increase in oxidation temperature from 600 to 1000 °C. The high oxidation temperature had a great effect on the microstructure and element distribution of the mineral phases in oxidized titanium slag. When the oxidation temperature was above 1400 °C, the titanium slag melted and TiO2 reacted with Al2O3 and MgO to form Al2TiO5 and MgTi2O5, which led to the Mg and Al contents of MxTi3−xO5(M = Mg, Al, Fe) obviously increased. The shape of rutile turned from acicular crystal to granular when the oxidation temperature was over 1000 °C, and the rutile particle grew up obviously from 1–2 μm (1000 °C) to 50–100 μm (1550 °C). The impurities in oxidized slag could be removed by pressure HCl leaching. The final rutile product with 90.06 mass% TiO2 was obtained.
Fuqiang Zheng; Yufeng Guo; Wenting Duan; Shuishi Liu; Guanzhou Qiu; Feng Chen; Tao Jiang; Shuai Wang. Transformation of Ti-bearing mineral in Panzhihua electric furnace titanium slag during oxidation roasting process. Journal of Thermal Analysis and Calorimetry 2017, 131, 1767 -1776.
AMA StyleFuqiang Zheng, Yufeng Guo, Wenting Duan, Shuishi Liu, Guanzhou Qiu, Feng Chen, Tao Jiang, Shuai Wang. Transformation of Ti-bearing mineral in Panzhihua electric furnace titanium slag during oxidation roasting process. Journal of Thermal Analysis and Calorimetry. 2017; 131 (2):1767-1776.
Chicago/Turabian StyleFuqiang Zheng; Yufeng Guo; Wenting Duan; Shuishi Liu; Guanzhou Qiu; Feng Chen; Tao Jiang; Shuai Wang. 2017. "Transformation of Ti-bearing mineral in Panzhihua electric furnace titanium slag during oxidation roasting process." Journal of Thermal Analysis and Calorimetry 131, no. 2: 1767-1776.
Yulei Sui; Subiao Liu; Tengfei Li; Qingxia Liu; Tao Jiang; Yufeng Guo; Jing-Li Luo. Atomically dispersed Pt on specific TiO2 facets for photocatalytic H2 evolution. Journal of Catalysis 2017, 353, 250 -255.
AMA StyleYulei Sui, Subiao Liu, Tengfei Li, Qingxia Liu, Tao Jiang, Yufeng Guo, Jing-Li Luo. Atomically dispersed Pt on specific TiO2 facets for photocatalytic H2 evolution. Journal of Catalysis. 2017; 353 ():250-255.
Chicago/Turabian StyleYulei Sui; Subiao Liu; Tengfei Li; Qingxia Liu; Tao Jiang; Yufeng Guo; Jing-Li Luo. 2017. "Atomically dispersed Pt on specific TiO2 facets for photocatalytic H2 evolution." Journal of Catalysis 353, no. : 250-255.
Yu-Feng Guo; Shuai Wang; Yu He; Tao Jiang; Feng Chen; Fu-Qiang Zheng. Deposit formation mechanisms in a pulverized coal fired grate for hematite pellet production. Fuel Processing Technology 2017, 161, 33 -40.
AMA StyleYu-Feng Guo, Shuai Wang, Yu He, Tao Jiang, Feng Chen, Fu-Qiang Zheng. Deposit formation mechanisms in a pulverized coal fired grate for hematite pellet production. Fuel Processing Technology. 2017; 161 ():33-40.
Chicago/Turabian StyleYu-Feng Guo; Shuai Wang; Yu He; Tao Jiang; Feng Chen; Fu-Qiang Zheng. 2017. "Deposit formation mechanisms in a pulverized coal fired grate for hematite pellet production." Fuel Processing Technology 161, no. : 33-40.
Yu-Lei Sui; Yu-Feng Guo; Tao Jiang; Guan-Zhou Qiu. Reduction kinetics of oxidized vanadium titano-magnetite pellets using carbon monoxide and hydrogen. Journal of Alloys and Compounds 2017, 706, 546 -553.
AMA StyleYu-Lei Sui, Yu-Feng Guo, Tao Jiang, Guan-Zhou Qiu. Reduction kinetics of oxidized vanadium titano-magnetite pellets using carbon monoxide and hydrogen. Journal of Alloys and Compounds. 2017; 706 ():546-553.
Chicago/Turabian StyleYu-Lei Sui; Yu-Feng Guo; Tao Jiang; Guan-Zhou Qiu. 2017. "Reduction kinetics of oxidized vanadium titano-magnetite pellets using carbon monoxide and hydrogen." Journal of Alloys and Compounds 706, no. : 546-553.
Feng Chen; Yu-Feng Guo; Tao Jiang; Fu-Qiang Zheng; Shuai Wang; Ling-Zhi Yang. Effects of high pressure roller grinding on size distribution of vanadium-titanium magnetite concentrate particles and improvement of green pellet strength. Journal of Iron and Steel Research International 2017, 24, 266 -272.
AMA StyleFeng Chen, Yu-Feng Guo, Tao Jiang, Fu-Qiang Zheng, Shuai Wang, Ling-Zhi Yang. Effects of high pressure roller grinding on size distribution of vanadium-titanium magnetite concentrate particles and improvement of green pellet strength. Journal of Iron and Steel Research International. 2017; 24 (3):266-272.
Chicago/Turabian StyleFeng Chen; Yu-Feng Guo; Tao Jiang; Fu-Qiang Zheng; Shuai Wang; Ling-Zhi Yang. 2017. "Effects of high pressure roller grinding on size distribution of vanadium-titanium magnetite concentrate particles and improvement of green pellet strength." Journal of Iron and Steel Research International 24, no. 3: 266-272.
Zinc ferrite (ZnFe2O4), one of the major forms of zinc in Electric Arc Furnace (EAF) dust and zinc leaching residue, is very difficult to chemically dissolve in either acidic or alkaline solutions. In spite of the zinc resources in the Electric Arc Furnace (EAF) dust and zinc leaching residue are abundant, there is no mature utilization technology. This situation not only causes the waste of resources, but also produces the harm to the environment. In the paper, the basic principle of this process has been established by revealing the phase equilibria in the CaO–Fe2O3–ZnO system, where Ca2Fe2O5 can be in equilibrium with ZnO rather than ZnFe2O4 at higher CaO region. It has also been demonstrated that the formed ZnO can be solved by ammonia-leaching and Ca2Fe2O5 keep in solid residue, which can be used as a flux for steel refining.
Zeqiang Xie; Yufeng Guo; Tao Jiang; Feng Chen; Lingzhi Yang. The Extraction of Zinc from Zinc Ferrite by Calcified-Roasting and Ammonia-Leaching Process. Proceedings of the International Conference on Martensitic Transformations: Chicago 2017, 485 -493.
AMA StyleZeqiang Xie, Yufeng Guo, Tao Jiang, Feng Chen, Lingzhi Yang. The Extraction of Zinc from Zinc Ferrite by Calcified-Roasting and Ammonia-Leaching Process. Proceedings of the International Conference on Martensitic Transformations: Chicago. 2017; ():485-493.
Chicago/Turabian StyleZeqiang Xie; Yufeng Guo; Tao Jiang; Feng Chen; Lingzhi Yang. 2017. "The Extraction of Zinc from Zinc Ferrite by Calcified-Roasting and Ammonia-Leaching Process." Proceedings of the International Conference on Martensitic Transformations: Chicago , no. : 485-493.
MxTi3-xO5 is the main titanium-bearing mineral in the titanium-bearing electric furnace slag (TEFS), which is produced by direct reduction-electric furnace smelting process with vanadium titanomagnetite concentrate in Panzhihua-Xichang region of China. In order to effectively utilize the titanium resource in TEFS, the thermomechanical analysis and conditions for the growing up of MxTi3-xO5 grain were investigated, which emphasized on the effects of CaF2 and cooling rate on the crystallization of MxTi3-xO5 in the melting process. The mineral phase and morphology of titanium-bearing slag were determined by XRD and electron microscope technique, respectively. The results indicated that the average grain size of MxTi3-xO5 grown up from 30 to 92 μm and the area fraction of MxTi3-xO5 reached about 66% from 61% under the conditions of 5 wt% CaF2 and cooling rate at 1 °C/min.
Fuqiang Zheng; XiaoMing Qu; Guanzhou Qiu; Yufeng Guo; Tao Jiang. Precipitation Behavior of MxTi3-xO5 in the Titanium-Bearing Electric Furnace Slag. Proceedings of the International Conference on Martensitic Transformations: Chicago 2017, 429 -437.
AMA StyleFuqiang Zheng, XiaoMing Qu, Guanzhou Qiu, Yufeng Guo, Tao Jiang. Precipitation Behavior of MxTi3-xO5 in the Titanium-Bearing Electric Furnace Slag. Proceedings of the International Conference on Martensitic Transformations: Chicago. 2017; ():429-437.
Chicago/Turabian StyleFuqiang Zheng; XiaoMing Qu; Guanzhou Qiu; Yufeng Guo; Tao Jiang. 2017. "Precipitation Behavior of MxTi3-xO5 in the Titanium-Bearing Electric Furnace Slag." Proceedings of the International Conference on Martensitic Transformations: Chicago , no. : 429-437.
Willemite is usually found in high-silicon oxide zinc ore and zinc metallurgical secondary resources but without effective extraction method yet. In this study, zinc was extracted from willemite by sodium salt roasting and ammonia-leaching process based on the idea of zinc phase reconstruction. The effects of Na2CO3 dosage, roasting temperature and roasting time on phase transformation and zinc leaching rate were studied, respectively. The results show that Zn2SiO4 was transformed into ZnO or Na2ZnSiO4 during roasting process. After roasting at 800 °C for 2.5 h at ratio of n(Na2CO3)/n(Zn2SiO4) = 2.5:1, willemite was thoroughly transformed into ZnO. The zinc leaching rate of the roasted sample was 97.62% in NH4Cl–NH3–H2O leaching system, which increased by 91.57% compared with zinc leaching rate of 6.05% when willemite was directly leached in NH4Cl–NH3–H2O system.
Xudong Liu; Ganghua Fu; Yufeng Guo; Tao Jiang; Wei Chen; Yujia Tan. Extraction of Zinc from Willemite by Sodium Salt Roasting and Ammonia-Leaching Process. Proceedings of the International Conference on Martensitic Transformations: Chicago 2017, 299 -307.
AMA StyleXudong Liu, Ganghua Fu, Yufeng Guo, Tao Jiang, Wei Chen, Yujia Tan. Extraction of Zinc from Willemite by Sodium Salt Roasting and Ammonia-Leaching Process. Proceedings of the International Conference on Martensitic Transformations: Chicago. 2017; ():299-307.
Chicago/Turabian StyleXudong Liu; Ganghua Fu; Yufeng Guo; Tao Jiang; Wei Chen; Yujia Tan. 2017. "Extraction of Zinc from Willemite by Sodium Salt Roasting and Ammonia-Leaching Process." Proceedings of the International Conference on Martensitic Transformations: Chicago , no. : 299-307.
The reduction of vanadium titano-magnetite pellets by H2–CO at temperatures from 850 to 1050°C was investigated in this paper. The influences of pre-oxidation treatment, reduction temperature, and \({{{V_{{H_2}}}} \mathord{\left/ {\vphantom {{{V_{{H_2}}}} {\left( {{V_{{H_2}}} + {V_{CO}}} \right)}}} \right. \kern-\nulldelimiterspace} {\left( {{V_{{H_2}}} + {V_{CO}}} \right)}}\) on the metallization degree were studied. The results showed that pre-oxidation played a substantial role in the reduction of vanadium titano-magnetite pellets. During the reduction process, the metallization degree increased with increasing temperature and increasing \({{{V_{{H_2}}}} \mathord{\left/ {\vphantom {{{V_{{H_2}}}} {\left( {{V_{{H_2}}} + {V_{CO}}} \right)}}} \right. \kern-\nulldelimiterspace} {\left( {{V_{{H_2}}} + {V_{CO}}} \right)}}\). The phase transformation of pre-oxidized vanadium titano-magnetite pellets during the reduction process under an H2 atmosphere and a CO atmosphere was discussed, and the reduced samples were analyzed by scanning electron microscopy (SEM) in conjunction with back scatter electron (BSE) imaging. The results show that the difference in thermodynamic reducing ability between H2 and CO is not the only factor that leads to differences in the reduction results obtained using different atmospheres. Some of Fe3−x Tix O4 cannot be reduced under a CO atmosphere because of the densification of particles’ structure and because of the enrichment of Mg in unreacted cores. By contrast, a loose structure of particles was obtained when the pellets were reduced under an H2 atmosphere and this structure decreased the resistance to gas diffusion. Moreover, the phenomenon of Mg enrichment in unreacted cores disappeared during H2 reduction. Both the lower resistance to gas diffusion and the lack of Mg enrichment facilitated the reduction of vanadium titano-magnetite.
Yu-Lei Sui; Yu-Feng Guo; Tao Jiang; Xiao-Lin Xie; Shuai Wang; Fu-Qiang Zheng. Gas-based reduction of vanadium titano-magnetite concentrate: behavior and mechanisms. International Journal of Minerals, Metallurgy, and Materials 2017, 24, 10 -17.
AMA StyleYu-Lei Sui, Yu-Feng Guo, Tao Jiang, Xiao-Lin Xie, Shuai Wang, Fu-Qiang Zheng. Gas-based reduction of vanadium titano-magnetite concentrate: behavior and mechanisms. International Journal of Minerals, Metallurgy, and Materials. 2017; 24 (1):10-17.
Chicago/Turabian StyleYu-Lei Sui; Yu-Feng Guo; Tao Jiang; Xiao-Lin Xie; Shuai Wang; Fu-Qiang Zheng. 2017. "Gas-based reduction of vanadium titano-magnetite concentrate: behavior and mechanisms." International Journal of Minerals, Metallurgy, and Materials 24, no. 1: 10-17.
The effects of basicity and MgO content on reduction behavior and separation of iron and slag during smelting vanadium titanomagnetite by electric furnace were investigated. The reduction behaviors affect the separation of iron and slag in the direct reduction-electric furnace process. The recovery rates of Fe, V, and Ti grades in iron were analyzed to determine the effects of basicity and MgO content on the reduction of iron oxides, vanadium oxides, and titanium oxides. The chemical compositions of vanadium-bearing iron and main phases of titanium slag were detected by XRF and XRD, respectively. The results show that the higher level of basicity is beneficial to the reduction ofiron oxides and vanadium oxides, and titanium content dropped in molten iron with the increasing basicity. As the content of MgO increased, the recovery rate of Fe increased slightly but the recovery rate of V increased considerably. The grades of Ti in molten iron were at a low level without significant change when MgO content was below 11%, but increased as MgO content increased to 12.75%. The optimum conditions for smelting vanadium titanomagnetite were about 11.38% content of MgO and quaternary basicity was about 1.10. The product, vanadium-bearing iron, can be applied in the converter steelmaking process, and titanium slag containing 50.34% TiO2 can be used by the acid leaching method.
Tao Jiang; Shuai Wang; Yufeng Guo; Feng Chen; Fuqiang Zheng. Effects of Basicity and MgO in Slag on the Behaviors of Smelting Vanadium Titanomagnetite in the Direct Reduction-Electric Furnace Process. Metals 2016, 6, 107 .
AMA StyleTao Jiang, Shuai Wang, Yufeng Guo, Feng Chen, Fuqiang Zheng. Effects of Basicity and MgO in Slag on the Behaviors of Smelting Vanadium Titanomagnetite in the Direct Reduction-Electric Furnace Process. Metals. 2016; 6 (5):107.
Chicago/Turabian StyleTao Jiang; Shuai Wang; Yufeng Guo; Feng Chen; Fuqiang Zheng. 2016. "Effects of Basicity and MgO in Slag on the Behaviors of Smelting Vanadium Titanomagnetite in the Direct Reduction-Electric Furnace Process." Metals 6, no. 5: 107.
High-quality titanium-rich material is of significance in the development of titanium industry as it is the main raw material to produce sponge titanium and titanium white using chloride process. Activation roasting of titanium slag with high Ca and Mg contents as adding H3PO4 followed by acid leaching was investigated to prepare titanium-rich material. The effects of H3PO4 dosage, roasting temperature and time, hydrochloric acid quantity, acid leaching temperature and time on TiO2 grade and removal of impurities were studied. The results show that after the finely ground titanium slag roasted with 8% H3PO4 at 1000°C for 2h, most Mg impurities in anosovite solid solution structure were converted into simple acid-soluble compounds. The impurities such as Ca and Mg obviously decreased when the hydrochloric acid concentration was 20%, leaching at 100°C for 2h, from which a titanium-rich material containing 82.56% TiO2 and 1.15% (CaO+MgO) was obtained.
Wenting Duan; Feng Chen; Fuqiang Zheng; Tao Jiang; Yufeng Guo. Preparation of High-Quality Titanium-Rich Material from Titanium Slag with High Ca and Mg Content by Activation Roasting Process. 7th International Symposium on High-Temperature Metallurgical Processing 2016, 559 -566.
AMA StyleWenting Duan, Feng Chen, Fuqiang Zheng, Tao Jiang, Yufeng Guo. Preparation of High-Quality Titanium-Rich Material from Titanium Slag with High Ca and Mg Content by Activation Roasting Process. 7th International Symposium on High-Temperature Metallurgical Processing. 2016; ():559-566.
Chicago/Turabian StyleWenting Duan; Feng Chen; Fuqiang Zheng; Tao Jiang; Yufeng Guo. 2016. "Preparation of High-Quality Titanium-Rich Material from Titanium Slag with High Ca and Mg Content by Activation Roasting Process." 7th International Symposium on High-Temperature Metallurgical Processing , no. : 559-566.
The hydrochloric acid leaching of titanium from titanium-bearing electric furnace slag was investigated under different experimental conditions. The results indicate that particle size, hydrochloric acid concentration and reaction temperature were of significance to the leaching kinetics. Specifically, reaction temperature was the most important factor followed by hydrochloric acid concentration and particle size. The shrinking core model was used to describe the leaching process which was controlled by surface chemical reaction. The kinetic equation was obtained and the activation energy was found to be 43.16 kJ/mol. Iron and calcium species were almost completely dissolved in the acid when the extraction degree of titanium reached 99.84%. MgO (19.34 wt.%) and Al2O3 (32.45 wt.%) in the spinel were still in the leaching residue and SiO2 (43.53 wt.%) in the form of quartz remained in the leaching residue.
Fuqiang Zheng; Feng Chen; Yufeng Guo; Tao Jiang; Andrew Yakovlevich Travyanov; Guanzhou Qiu. Kinetics of Hydrochloric Acid Leaching of Titanium from Titanium-Bearing Electric Furnace Slag. JOM 2016, 68, 1476 -1484.
AMA StyleFuqiang Zheng, Feng Chen, Yufeng Guo, Tao Jiang, Andrew Yakovlevich Travyanov, Guanzhou Qiu. Kinetics of Hydrochloric Acid Leaching of Titanium from Titanium-Bearing Electric Furnace Slag. JOM. 2016; 68 (5):1476-1484.
Chicago/Turabian StyleFuqiang Zheng; Feng Chen; Yufeng Guo; Tao Jiang; Andrew Yakovlevich Travyanov; Guanzhou Qiu. 2016. "Kinetics of Hydrochloric Acid Leaching of Titanium from Titanium-Bearing Electric Furnace Slag." JOM 68, no. 5: 1476-1484.
Willemite is typically found in oxidized zinc ores and metallurgical secondary resources but without effective extraction method yet. Based on the ideas of zinc phase reconstruction in the willemite, the extraction of zinc from willemite by calcified-roasting using CaO as additive and ammonia-leaching process was studied in this paper. The influences of CaO dosage, roasting temperature, roasting time on the phase transformation and zinc leaching rate were studied, which were characterized by XRD. The results indicated that Zn2SiO4 was transformed into ZnO or Zn2CaSi2O7 .After roasted with 1.4 times of theoretical CaO dosage at l280 “Cfor 40 minutes, willemite was thoroughly transformed into ZnO. The zinc leaching rate of the roasted sample was 97.45% in NH4Cl-NH3-H2O leaching system, which increased by 91.40 % compared with zinc leaching rate of 6.05% when willemite was directly leached in NH4Cl-NH3-H2O system.
Wei Chen; Yufeng Guo; Feng Chen; Tao Jiang; Xudong Liu. The Extraction of Zinc from Willemite by Calcified-Roasting and Ammonia-Leaching Process Based on Phase Reconstruction. 7th International Symposium on High-Temperature Metallurgical Processing 2016, 109 -116.
AMA StyleWei Chen, Yufeng Guo, Feng Chen, Tao Jiang, Xudong Liu. The Extraction of Zinc from Willemite by Calcified-Roasting and Ammonia-Leaching Process Based on Phase Reconstruction. 7th International Symposium on High-Temperature Metallurgical Processing. 2016; ():109-116.
Chicago/Turabian StyleWei Chen; Yufeng Guo; Feng Chen; Tao Jiang; Xudong Liu. 2016. "The Extraction of Zinc from Willemite by Calcified-Roasting and Ammonia-Leaching Process Based on Phase Reconstruction." 7th International Symposium on High-Temperature Metallurgical Processing , no. : 109-116.
The fluorine-bearing iron concentrate is one of the refractory raw materials for pelletization, which is mainly used in Baotou iron and steel company with lots of problems, such as narrow roasting temperature range and low compressive strength of products. According to its specific character, the effects of roasting temperature, time on the compressive strength and microstructure of pellets were researched. The results show that low melting substances formed during the roasting was the dominant reason of those problems. High melting substances were added in the roasting to investigate their effects on the roasting properties of fluorine-bearing iron concentrate pellets. Low melting substances were reduced when chromite was added. The compressive strength of products was 3100N/P when the 2% chromite was added at the roasting temperature of 1150 °C, which was increased 700 N/P compared with the pellets without chromite, and the roasting temperature range was expanded by 170 °C.
Lu Yang; Shuai Wang; Gang-Hua Fu; Yu-Feng Guo; Tao Jiang. The Preheating and Roasting Properties of Fluorine-Bearing Iron Concentrate Pellets and Main Influence Factors. 7th International Symposium on High-Temperature Metallurgical Processing 2016, 369 -375.
AMA StyleLu Yang, Shuai Wang, Gang-Hua Fu, Yu-Feng Guo, Tao Jiang. The Preheating and Roasting Properties of Fluorine-Bearing Iron Concentrate Pellets and Main Influence Factors. 7th International Symposium on High-Temperature Metallurgical Processing. 2016; ():369-375.
Chicago/Turabian StyleLu Yang; Shuai Wang; Gang-Hua Fu; Yu-Feng Guo; Tao Jiang. 2016. "The Preheating and Roasting Properties of Fluorine-Bearing Iron Concentrate Pellets and Main Influence Factors." 7th International Symposium on High-Temperature Metallurgical Processing , no. : 369-375.
Reduction roasting with sodium sulfate followed by magnetic separation was investigated to utilize vanadium tailings with total iron grade of 54.90 wt% and TiO2 content of 17.40 wt%. The results show that after reduction roasting–magnetic separation with sodium sulfate dosage of 2 wt% at roasting temperature of 1150 °C for roasting time of 120 min, metallic iron concentrate with total iron grade of 90.20 wt%, iron recovery rate of 97.56 % and TiO2 content of 4.85 wt% is obtained and high-titanium slag with TiO2 content of 57.31 wt% and TiO2 recovery rate of 80.27 % is also obtained. The results show that sodium sulfate has a catalytic effect on the reduction of tailings in the novel process by thermodynamics, scanning electron microscopy (SEM) and X-ray diffraction (XRD) and reacts with silica and alumina in the tailings to form sodium silicate and sodium aluminosilicate. Migration of elements and chemical reactions destroy the crystal structures of minerals and promote the reduction of vanadium tailings, resulting in that iron grains grow to large size so that metallic iron concentrate with high total iron grade and low TiO2 content is obtained.
Yu-Lei Sui; Yu-Feng Guo; Andrew Yakovlevich Travyanov; Tao Jiang; Feng Chen; Guan-Zhou Qiu. Reduction roasting–magnetic separation of vanadium tailings in presence of sodium sulfate and its mechanisms. Rare Metals 2015, 35, 954 -960.
AMA StyleYu-Lei Sui, Yu-Feng Guo, Andrew Yakovlevich Travyanov, Tao Jiang, Feng Chen, Guan-Zhou Qiu. Reduction roasting–magnetic separation of vanadium tailings in presence of sodium sulfate and its mechanisms. Rare Metals. 2015; 35 (12):954-960.
Chicago/Turabian StyleYu-Lei Sui; Yu-Feng Guo; Andrew Yakovlevich Travyanov; Tao Jiang; Feng Chen; Guan-Zhou Qiu. 2015. "Reduction roasting–magnetic separation of vanadium tailings in presence of sodium sulfate and its mechanisms." Rare Metals 35, no. 12: 954-960.