加碳条件下钼精矿真空冶炼过程中主要杂质元素的行为分析

采用在钼精矿真空冶炼过程中添加碳粉的方法,进一步降低钼精矿真空冶炼过程中主要杂质SiO2、MgO、Al2O3和CaO的含量。热力学计算结果表明:SiO2、MgO、Al2O3和CaO均有可能与碳发生反应,生成气态物质被去除。试验研究结果表明,在钼精矿真空冶炼过程中加入碳粉可以明显降低其中Si、Mg、Al和Ca的含量,其中Si的脱除率约达到100%,Mg的脱除率约达到99.7%,Al的脱除率约达到78.44%,Ca的脱除率最高约为9.8%。采用品位为48%的低品位钼精矿为原料,经过真空冶炼过程,得到的金属钼产品中钼含量达到92%,S含量降至0.69%,主要杂质元素SiO2含量降至0.0021%,Cu含量小于0.005%,P含量小于0.005%,Mg含量降至0.001%,Al含量降至0.64%,Ca含量为0.51%。

Behavior analysis of main impurity elements in vacuum smelting of molybdenum concentrate with carbon

In order to further reduce the impurities content of SiO2,MgO,Al2O3 and CaO in the vacuum smelting process of molybdenite concentrates,a method of adding carbon powder in the vacuum smelting process of molybdenite concentrates was adopted.Thermodynamic calculation results show that SiO2,MgO,Al2O3 and CaO may react with carbon to generate gaseous substances which can be removed by vacuum pump.The results show that the addition of carbon powder in the vacuum smelting of molybdenite concentrate can significantly reduce the contents of Si,Mg,Al and Ca.The removal rates of Si,Mg,Al can reach about 100%,99.7%,and 78.44%,respectively.The max removal rate of Ca can reach about 9.8%.When 48%low-grade molybdenite concentrate are used as raw material in the vacuum smelting process,the content of Mo in the metal product can reach 92%,and the content of S decreases to 0.69%.The main impurity SiO2 decreases to 0.0021%,and the contents of Cu and P are all less than 0.005%,and the contents of Mg,Al and Ca are 0.001%,0.64%and 0.51%,respectively.