含银氧化锰矿高温氯化过程研究

HIGH TEMPERATURE CHLORINATION OF SILVER-BEARING OXIDIZED MANGANESE ORE

对高温下Mn-Cl-O系及Ag/ASCl平衡图进行分析,找出了理论上银、锰的存在形态。以内蒙呼盟含银氧化锰矿石为原料,在实验室对高温氯化过程中影响银挥发率的因素进行了研究。得出了氯化剂用量,氯化温度、球团直径及氯化时间与银挥发率的定量关系。95％～98％的锰残留在球团中,主要以Mn_2O_3和MnSiO_3形态存在。在最佳条件下银挥发率为98.8％,球团残银12.1g/t。

The predominance area diagrams of Mn-Cl-O and Ag/AgCl systems show the stable products of silver and manganese at high temperature chlorination. Factors affecting the volatility of silver during high temperature chlorination were investigated in laboratory on the raw material from E REN TAO LEI GAI Inner Mongolia, China, revealing the relationship between volatility of silver and amount of calcium chloride, roasting time, temperature and pellet size. 95%-98% manganese remained in calcine in forms of Mn2O3 and MnSiO3. Under the optimum roasting conditions, the volatility of silver is 98.8% and the content of residual silver in calcine is 12.1g/t.