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Optimization of preparation process of high-strength pellets from Panzhihua ilmenite concentrate

Journal of Iron and Steel Research International 2023年第12期30卷 2391-2402页

作者： Gang-wei Zhou Wei Lv Fu-rong Chen Zheng-gen Liu Man-sheng Chu Xue-wei Lv School of Metallurgy Northeastern UniversityShenyang110819LiaoningChina College of Materials Science and Engineering Chongqing UniversityChongqing400044China

The preparation of high-strength pellets from Panzhihua ilmenite concentrate is important for the hydrogen-rich smelting of titania slag and was *** effects of the magnetite concentrate and heating procedure including the pre-heating temperature and period as well as roasting temperature and period on the compressive strength of the roasted pellets were ***-strength ilmenite concentrate pellets(>2000 N)were prepared by optimizing the roasting *** addition of magnetite concentrate is beneficial for increasing the compressive strength of the Panzhihua ilmenite concentrate pellet by oxidizing hematite which filled the pseudobrookite particles,functioned as a bridge bond,and improved the interconnection between the *** compressive strength can reach up to 2900 N when the ilmenite concentrate pellet with 15%magnetite concentrate is pre-heated above 800℃ for 20 min and then roasted at 1250℃ for 20 *** addition,there is an overall upward trend in the compressive strength with an increase in the pre-heating temperature and period as well as the roasting temperature and *** micromorphology and strengthening consolidation mechanism of Panzhihua ilmenite concentrate pellets were also discussed.

关键词： ilmenite concentrate Pelletizing Roasting Compressive strength-Pellet

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Effects of Na_(2)CO_(3)on reduction mechanism and kinetics of iron during deep reduction of ilmenite concentrate

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Journal of Iron and Steel Research International 2023年第3期30卷 419-428页

作者： Xiao-dong Lv You-ling Hou Yun-tao Xin Wei Lv Xue-wei Lv Chongqing Key Laboratory of Vanadium-Titanium Metallurgy and New Materials Chongqing UniversityChongqing 400044China College of Materials Science and Engineering Chongqing UniversityChongqing 400044China School of Metallurgy Northeastern UniversityShenyang 110819LiaoningChina

High-quality upgraded titanium slag obtained through semi-molten reduction with the addition of Na_(2)CO_(3)is important for the fluidizing chlorination process to produce TiO_(2)*** key is the effect of Na_(2)CO_(3)on the reduction behavior of ***,the effects of Na_(2)CO_(3)on reduction mechanism and kinetics of iron during deep reduction of ilmenite concentrate were *** results indicated that the metallization ratio of the reduced sample increased with increasing temperature,time,and dose of Na_(2)CO_(3).The addition of Na_(2)CO_(3)significantly accelerated the reduction of iron in the ilmenite concentrate and promoted the growth of iron ***,the addition of Na_(2)CO_(3)produced sodium iron titanates;thus,the metallization ratio of the sample decreased with an increase in the temperature and time when the temperature was above 1200℃and the time was more than 30 *** the doses of Na_(2)CO_(3)were 0,3,and 6 wt.%,the reduction of iron was controlled by the interfacial chemical reaction,both the interfacial chemical reaction and diffusion,and diffusion,respectively,and the apparent activation energies were 134.91,64.89,and 120.82 kJ/mol,respectively.

关键词： ilmenite concentrate Sodium carbonate Metallization ratio Reduction mechanism Kinetics

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Effect of sodium carbonate addition on carbothermic reduction of ilmenite concentrate

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Transactions of Nonferrous Metals Society of China 2022年第3期32卷 1010-1018页

作者： Xiao-dong LÜ Dan CHEN Yun-tao XIN Wei LÜ Xue-wei LÜ College of Materials Science and Engineering Chongqing UniversityChongqing 400044China Chongqing Key Laboratory of Vanadium−Titanium Metallurgy and Advanced Materials Chongqing UniversityChongqing 400044China

The enhanced reduction mechanism and kinetics of different Na_(2)CO_(3) additions in the carbothermic reduction of ilmenite concentrate were *** reduction process was carried out at different heating rates in a thermogravimetry facility,and the kinetics was studied using the Starink *** results indicate that Na_(2)CO_(3) addition enhanced the reduction effect as well as reduced the initial temperature of the reaction and the activation energy by increasing reactant activity in reactant form;however,it deteriorated the late-stage kinetic conditions by generating a molten phase,thereby reducing the reaction rate in the late stages of *** average apparent activation energies of ilmenite concentrate with 0%,3%,and 6%Na_(2)CO_(3) are 447,289,and 430 kJ/mol,*** results from kinetics parameters confirm that Na_(2)CO_(3) addition accelerated the reduction kinetics;however,excessive addition worsened the reduction kinetics.

关键词： ilmenite concentrate non-isothermal kinetics reduction mechanism apparent activation energy

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