辉钼矿石灰焙烧优势区域图

摘要

绘制了Ca-Mo-S-O系热力学优势区域图,研究了石灰对辉钼矿焙烧过程的作用.热力学分析表明,CaO显著降低Ca-Mo-S-O系的Pso2,在极低Po2条件下MoS2与CaO反应生成Mo、CaS;相比于Mo-S-O系,CaO的存在使Ca-Mo-S-O系Mo(Ⅳ)氧化为Mo(Ⅵ)的Po2显著降低,且Mo(Ⅳ)优先氧化生成CaMoO4;Ca-Mo-S-O系中S(Ⅱ)在Po2较低时以CaS存在,Po2较高时生成CaSO4;CaMoO4作为MoS2氧化焙烧固硫剂,在较高Po2下与MoS2生成CaSO4、MoO3.热力学研究结果与现有实验研究结论基本相符.%The predominance diagram of Ca-Mo-S-O system was drawn,and the effect of lime on roasting process of molybdenite was studied.Thermodynamic analysis shows that the presence of CaO significantly decreases the PSO2 of Ca-Mo-S-O system and MoS2 can be decomposed into Mo and CaS at lower PO2.The presence of CaO decreases the oxygen potential of Mo(Ⅳ) to Mo(Ⅵ),and Mo(Ⅳ) preferentially generates CaMoO4.When the oxygen potential is lower the S(Ⅱ) existes as CaS,and when oxygen potential is higher the S(Ⅱ) generates CaSO4.CaMoO4 can be used as the sulfur fixing agent for MoS2 oxidation roasting to produce CaSO4 and MoO3.The thermodynamic research results agrees with the existing experimental results.