模拟菱锰矿硫酸浸出液中铁离子的去除

为了考察菱锰矿硫酸浸出液采用Na_3PO_4除铁的可行性,以及除铁所生成的FePO_4滤渣用NaOH处理以回收PO_4~(3-)的效果,对Mn~(2+)、Fe~(2+)浓度分别为18.04、5.20g/L的模拟菱锰矿硫酸浸出液进行了Na_3PO_4除铁、PO_4~(3-)回收工艺条件试验。结果表明:在H_2O_2用量为理论量、溶液pH=1.8、Na_3PO_4用量为1.7倍理论量、搅拌时间为15min情况下,Fe~(2+)去除率达99.85%、Mn~(2+)损失率仅为2.23%;FePO_4滤渣用0.75倍理论量的NaOH处理,反应3h时的PO_4~(3-)回收率达98.24%。因此,菱锰矿硫酸浸出液采用Na_3PO_4除铁不仅可行,而且因PO_4~(3-)可回收再利用,除铁工艺成本较低。

Iron Removal from Simulated Acid Leaching Solution of Manganese Carbonate Ore

In order to investigate the possibility of removing iron by phosphate on acid leaching solution of manganese carbonate ore，and explore the effects of recycling phosphate anions by NaOH in the processes of the generated FePO4 residue，the condition experiments of removing iron and recycle phosphate anions in the simulated solution obtained from acid leaching of manganese carbonate ore of Mn2+，Fe2+ concentrations were 18.04，5.20 g/L were conducted.The results show that the theoretical amount of H2O2，pH=1.8，sodium phosphate dosage of 1.7 times theoretical amount，reaction time to be 15 minutes at room temperature，the removal rates of Fe2+ is 99.85% and the loss rates of Mn2+ is only 2.23%.Under the optimal conditions that sodium hydroxide to be 0.75 times of the theoretical amount and response time of 3 hours，recovery of PO3-4 is 98.24%.Therefore，the processing of removing iron by phosphate on acid leaching of manganese carbonate ore is not only feasible，but also at a low price because of the high recovery of PO3-4.