碳热还原辉钼矿过程的物相变化规律研究

通过X衍射分析法研究了碳热还原辉钼矿过程的物相变化规律。不使用还原剂直接用CaO处理辉钼矿反应的最终产物为:CaS、Ca MoO4、Ca5Mo18O29和Mo;该反应过程中会出现Ca Mo6S8相,但在1 100℃下加热6 h时,Ca Mo6S8基本消失。使用炭粉作还原剂时,炭粉还原钼的中间产物由易至难的顺序为:Ca MoO4、Ca5Mo18O29和Ca Mo6S8;当温度≤1 150℃,炭粉配比小于4.0时的最终产物物相是Mo和CaS;当温度为1 150℃,炭粉配比为6.0时产物有少量的Mo2C生成。

Study on Product Phases during Carbothermic Reduction of Molybdenite

Product phases during carbothermic reducing of molybdenite were studied by XRD.Final product phases of molybdenite treated by lime directly are CaS,CaMoO4,Ca5Mo18O29 and Mo;CaMo6S8 is available during the reaction,but it disappears when the reaction proceeds for 6 hours at 1 100℃.Sequence of interim phases reduced by carbon from easy to difficult is CaMoO4,Ca5Mo18O29 and CaMo6S8;final product phases of molybdenite treated by lime with carbon as reducing agent are Mo and CaS when temperature below 1 150℃ and carbon ratio less than 4.0;but there is a little Mo2C phase in the final product when temperature at 1 150℃ and carbon ratio at 6.0.