期刊
HYDROMETALLURGY
卷 185, 期 -, 页码 55-60出版社
ELSEVIER
DOI: 10.1016/j.hydromet.2019.01.008
关键词
Synergistic solvent extraction; P204; 4PC; Manganese; Magnesium; Calcium
资金
- National Natural Science Foundation of China [NSFC51404297]
The synergistic solvent extraction (SSX) system consisting of di-2-ethylhexyl phosphoric acid (P204) and alkyl-4-pyridinecarboxylate ester (4PC) in sulfonated kerosene was used to separate manganese from magnesium and calcium and to prepare pure manganese sulfate solutions with battery grade. In batch tests, over 99.9% of Mn2+ was extracted after a four-stage counter current extraction using an organic solution consisting of 0.25 mol/L P204 and 0.5 mol/L 4PC in sulfonated kerosene and a feed containing 22 g/L Mn2+, 4 g/L Mg2+ and 0.1 g/L Ca2+ with an A/O ratio of 1:6 at 25 degrees C for 10 min, while extractions of magnesium and calcium were negligible. After scrubbing using 0.025 mol/L H2SO4 at an A/O ratio of 1:8, the loaded organic solution was stripped using 0.7 mol/L H2SO4 at an A/O ratio of 1:8 to prepare pure manganese sulfate solutions with battery grade. The results of continuous operation test indicated that the mass ratios of Ca/Mn and Mg/Mn in strip liquors were below 5.6 x 10(-5) and 2.5 x 10(-4), respectively, further demonstrating the efficient separation of manganese from magnesium and calcium using the SSX system.
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