硫酸镍钴锰溶液中除氟工艺研究

针对从硫酸镍钴锰溶液中除氟效率低、有价金属损失严重等问题, 开展了以Al₂(SO₄)₃·18H₂O为沉淀剂、从硫酸镍钴锰溶液中除氟新工艺研究。考察了反应pH值、Al₂(SO₄)₃·18H₂O用量、反应温度、反应时间等参数对除氟效果的影响, 结果表明, 在初始pH值5.5、氟铝物质的量比为5、反应温度40 ℃、反应时间120 min条件下, 除氟后溶液中氟浓度从初始的3.22 g/L降至0.15 g/L以下, 且引入的Al³⁺浓度低于0.01 g/L, 镍钴锰总损失率低于5%。

Technical Process for Removing Fluorine from Ni-Co-Mn Sulfate Solution

Aiming at the problems of low efficiency of removing fluorine from Ni-Co-Mn sulfate solution and high losses of valuable elements in the process, a new fluorine removal process with Al₂(SO₄)₃·18H₂O as a precipitant was proposed, and the effects of pH value, dosage of Al₂(SO₄)₃·18H₂O, reaction temperature and reaction time on fluorine removal rate were investigated. The results show that after a 120-min reaction at 40 ℃, with an initial pH value at 5.5, and fluorine and aluminum at a molar ratio of 5, the fluoride concentration in the solution can be decreased from 3.22 g/L to less than 0.15 g/L, and the concentration of the added Al³⁺ in the solution is also less than 0.1 g/L. Furthermore, the total loss rate of Ni, Co, Mn in the solution is less than 5%.