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Carbothermic reduction kinetics of ilmenite concentrates catalyzed by sodium silicate and microwave-absorbing characteristics of reductive products

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Author(s): Li Wei | Peng Jinhui | Guo Shenghui | Zhang Libo | Chen Guo | Xia Hongying

Journal: Chemical Industry and Chemical Engineering Quarterly
ISSN 1451-9372

Volume: 19;
Issue: 3;
Start page: 423;
Date: 2013;
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Keywords: sodium silicate | ilmenite concentrates | catalytic reduction | kinetics | microwave absorbing characteristics

ABSTRACT
Carbothermic reduction kinetics of ilmenite concentrates catalyzed by sodium silicate was investigated; the reduction degree of ilmenite concentrates reduction reaction was deduced as. R = (4(16y+56x)(∆W∑ - fA-PW))/(7(16y + 56x + 112)). Results show that reaction activation energy of initial stage and later stage is 36.45 kJ/mol and 135.14kJ/mol, respectively. There is a great change for reduction rate at temperatures of 1100 ºC and 1150 ºC; the catalysis effect and great change of reduction rate were evaluated by TG and DSC curves of sodium silicate. Microwave-absorbing characteristics of reduction products were measured by the method of microwave cavity perturbation. It is found that microwave absorbing characteristics of reduction products obtained at temperatures of 900 ºC, 1100 ºC and 1150 ºC have great changes, combined XRD characterization, explaining the formation and accumulation of reduction product Fe, and great changes of microwave absorbing characteristics were due to the decrease of the content of ilmenite concentrates. [Acknowledgments. The authors would like to express their gratitude for the financial support of the Major Program of National Natural Science Foundation of China (Grant No. 51090385), the International S&T Cooperation Program of China (No. 2012DFA70570), the Yunnan Provincial International Cooperative Program (No. 2011IA004) and Reserve Talents of Middle-aged and Young Academic Technology Leaders in Yunnan Province (2011CI010)]
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