文章基本信息

标题：Carbothermic reduction kinetics of ilmenite concentrates catalyzed by sodium silicate and microwave-absorbing characteristics of reductive products
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作者：Wei Li ; Jinhui Peng ; Shenghui Guo 等
期刊名称：Chemical Industry and Chemical Engineering Quarterly
印刷版ISSN：1451-9372
出版年度：2013
卷号：19
期号：3
页码：423-433
DOI：10.2298/CICEQ120421077L
出版社：Association of the Chemical Engineers
摘要：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.
关键词：sodium silicate; ilmenite concentrates; catalytic reduction; kinetics; microwave absorbing characteristics