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研究了利用碳酸氢铵法与磷酸铵镁法连续处理富镁硫酸锰溶液的工艺。结果表明,利用碳酸氢铵法分离锰镁的优化条件为:碳酸氢铵浓度2.0 mol/L,溶液p H值=6.8~7.0,反应温度40℃,反应时间30 min,不静置直接抽滤洗涤。此时锰回收率达到了98.94%,镁保留率达到了89.07%。继续利用磷酸铵镁法回收溶液中保留的镁离子,以镁离子与磷酸根离子摩尔比为1.2∶1加入磷酸氢二铵,调p H=10,镁的回收率达到了97.75%。采用这两种方法连续处理富镁硫酸锰溶液,不仅有效地分离了锰镁离子,还得到了市场价值较大的碳酸锰和磷酸铵镁,具有较大的应用价值。
The process of continuous treatment of magnesium-rich manganese sulfate solution by using ammonium bicarbonate method and magnesium ammonium phosphate method was studied. The results showed that the optimum conditions for the separation of manganese and magnesium by ammonium bicarbonate method were as follows: the concentration of ammonium bicarbonate was 2.0 mol / L, the pH of solution was 6.8-7.0, the reaction temperature was 40 ℃, the reaction time was 30 min, washing. At this point, the recovery rate of manganese reached 98.94% and the retention rate of magnesium reached 89.07%. Continue to use magnesium ammonium phosphate recovery of magnesium ions retained in the solution, magnesium and phosphate ions molar ratio of 1.2: 1 to add diammonium hydrogen phosphate, adjust pH = 10, magnesium recovery rate reached 97.75%. Using these two methods to continuously treat magnesium-rich manganese sulfate solution not only effectively separated manganese and magnesium ions, but also obtained manganese carbonate and ammonium magnesium phosphate with larger market value, which has great application value.