从含锰钴镍浸出液中萃取回收锰

采用P204作为萃取剂,磺化煤油为稀释剂,从锰钴镍溶液中二级萃取分离锰,有机相反萃取富集锰,考察各因素对锰萃取率及分离系数的影响并确定最优条件。结果表明,在室温下,一级萃取相比O/A=2.5,P204含量30%,pH=3.5,皂化率30%,锰萃取率为62.39%;二级萃取在P204含量30%,皂化率30%,O/A=2,锰的总萃取率达98.06%,锰与钴、镍分离系数分别为90.11、92.33。萃取液经硫酸反萃洗钴镍,按相比O/A=10,酸度70 g/L,可洗去85%以上的钴和镍。洗钴镍后液经硫酸反萃锰,按相比O/A=4,酸度110 g/L,可反萃98.27%的锰,反萃液钴、镍的浓度小于0.5 g/L。

Recovery of Manganese from Mn, Co, Ni Containing Leaching Solution by Extraction

With P204 as extractant and sulfonated kerosene as diluent, manganese was separated from cobalt and nickel bearing solution by two-step extraction and enriched by organic reverse extraction. Effects of factors on Mn extraction rate and separation coefficient were conducted and the optimum conditions were obtained. The results show that Mn extraction rate at room temperature is 62.39% at first stage under the conditions including O/A=2.5, P204 concentration of 30%, pH value of 3.5, and saponification rate of 30%. Total Mn extraction rate of two-step extraction is 98.06% and separation coefficient of Mn to Co and Ni is 90.11 and 92.33 respectively under the conditions including P204 concentration of 30%, saponification rate of 30%, and O/A=2. 85% above of Co and Ni is washed away by 70 g/L sulfuric acid with O/A=10. 98.27% manganese is stripped from Co-Ni-washed solution by 110 g/L sulfuric acid with O/A=4. Both concentration of Co and Ni in strip solution is 0.5 g/L below.