废盐酸浸出菱锰矿扩大试验及除钙工艺优化

Amplified Experiment and Optimized Decalcification Process on Leaching Rhodochrosite Using Waste Hydrochloride

利用废盐酸对低品位菱锰矿进行了扩大浸出试验,并对除钙工艺进行优化。结果表明:扩大试验锰浸出率可达95%;氯化锰溶液中钙浓度低于5 g.L-1时,钙不会随结晶析出;草酸和硫酸锰对浸出液除钙后溶液中钙含量分别还有8.3和7.9 g.L-1;利用硫酸锰在浸出过程中同时除钙,过量系数为0.8时,浸出液经一次浓缩(浓缩比0.25)后钙浓度可降至1.7 g.L-1,除钙率达到96%,省略了额外的除钙工序,一次浓缩后获得石膏纤维副产品。

Amplified experiment on leaching low-grade rhodechrosite using industrial waste hydrochloride was operated.The optimized process of removing Ca was discussed.The results showed that the leaching rate of Mn could reach 95%.Ca would not be precipitated with crystallization process when Ca content was lower than 5 g · L-1 in MnCl2 solution.There still existed 8.3 and 7.9 g · L-1 of Ca content after using oxalic acid and manganese sulfate to remove Ca in the lixivium.However,manganese sulfate was more suitable for removing Ca at the same time.Ca content in lixivium would reduce to 1.7 g · L-1 after preliminary concentration（concentration ratio was 0.25）,the rate of removing Ca could reach 96%,and calcium sulphate crystal whisker would be formed.This new decalcification process was simple and promising.