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Isothermal kinetics of carbothermic reduction of ilmenite concentrate with the addition of sodium carbonate
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  • Xiaodong Lv,
  • Dan Chen,
  • Yuntao Xin,
  • Jie Dang,
  • Wei Lv,
  • Xuewei Lv
Xiaodong Lv
Chongqing University
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Dan Chen
Chongqing University
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Yuntao Xin
Chongqing University
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Wei Lv
Chongqing University
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Xuewei Lv
Chongqing University
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Abstract

The isothermal kinetics of carbothermic reduction of low grade ilmenite concentrate with the addition of sodium carbonate which was regarded as a novel process to obtain high quality UGS slag used for chlorination process through the semi-molten states was studied. The results showed that the addition of Na2CO3 can reduce the start temperature of the reaction and promote the reduction, which is benefit to improve the reaction kinetic by enhancing the carbon gasification reaction. The metal iron produced during the reaction was more likely to migrate and grow with the formation of the molten phase. With the increase of sodium carbonate, the reduction process of ilmenite concentrate is gradually changed from controlled by interfacial chemical reaction to controlled by diffusion. When the amount of sodium carbonate was 0%, 3% and 6%, the apparent activation energies were 105.01, 112.07 and 123.48 kJ/mol, respectively.