从高杂质低品位钼焙砂中苏打高压浸出钼的试验研究

以低品位高杂质含量钼焙砂为原料, 采用苏打高压浸出的方法浸取钼。研究了苏打加入量、液固比、浸出时间、浸出温度、添加剂种类及用量对浸出过程的影响。实验结果表明: 当苏打加入量为矿样的30%, 氧化镁加入量为矿样的2.5%, 温度160 ℃, 液固比2∶1, 浸出时间90 min时, 钼的浸出率可达到95.9%, 同时硅钼分离系数为25, 钼与主要杂质实现了初步分离。该工艺具有操作简单、试剂消耗少、钼回收率高的优点。

Experimental Study on Leaching Molybdenum at High Pressure with Soda from Low-grade Molybdenum Calcine with High Impurities

Low-grade molybdenum calcine with high impurities was used as raw materials and molybdenum was leached with soda at high pressure. The effects of the soda addition, L/S ratio, leaching time and temperature, the type and amount of additives on the leaching process were investigated. The results showed that with the amount of soda and magnesium oxide accounting for 30% and 2.5% of the ore samples respectively, at a temperature of 160 ℃, with L/S ratio of  2∶1, 90 min leaching time, the leaching rate of molybdenum reached 95.9%, with a separation coefficient of 25 for silicon and molybdenum, resulting in a preliminary separation between molybedenum and main impurities. This process has the advantages of simple operation, low reagent consumption and high recovery of molybdenum.