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针对一种复杂低品位钼精矿焙烧氨浸得到的钼酸铵溶液中Zn含量高的问题,在传统工艺基础上采用“碳酸铵-氨水、硫化铵”两段净化新工艺对经硫化铵处理后的钼酸铵溶液进行处理,着重考察了试剂用量、pH值、反应温度、反应时间对Zn脱除率的影响,得到优化净化工艺条件:一段净化中,碳酸铵加入量为理论量的1.2倍,反应温度45℃,反应时间0.5h,pH=9,Zn脱除率达95%以上;二段净化中,氨水和硫化铵加入量为理论量的1.1倍,反应温度45℃,反应时间0.5h,pH=8.5,Zn脱除率高于96%。综合Zn脱除率达到99.5%以上,Mo损失低于1%,净化液可直接通过酸沉、结晶获取钼酸铵一级品。
Aiming at the problem of high Zn content in ammonium molybdate solution obtained by roasting ammonia leaching of a complex low-grade molybdenum concentrate, traditional technology was adopted to purify the sulphurized new process with two steps of “ammonium carbonate-ammonia water and ammonium sulphate” Ammonium molybdate solution was treated with ammonia, the effects of reagent dosage, pH value, reaction temperature and reaction time on the removal rate of Zn were investigated. The optimized purification process conditions were as follows: the amount of ammonium carbonate added was the theoretical amount 1.2 times, the reaction temperature was 45 ℃, the reaction time was 0.5h, the pH was 9, and the removal rate of Zn was more than 95%. The amount of ammonia and ammonium sulphate in the second stage purification was 1.1 times of the theoretical amount and the reaction temperature was 45 ℃. Reaction time 0.5h, pH = 8.5, Zn removal rate higher than 96%. The comprehensive removal rate of Zn reaches more than 99.5% and the Mo loss is less than 1%. The purification solution can directly obtain the ammonium molybdate first grade by acid precipitation and crystallization.