Method for preparing battery-grade high-purity manganese sulfate through precipitation and ethanol crystallization technology

• Main Authors: LI SHAN, YANG KUAN, CHEN HOUYANG, HAN YUCHEN, ZHANG GUANGLIANG, MING XIANQUAN, LAN DAWEI, ZHAN FENG, LI GUILIANG, LI WEIJIAN, SHI SHUXIAN, YAO HONGBIN, GU YIXUN, HUANG GUANHAN, MO QUANXING, ZHAN HAIQING
• Format: Patent
• Language: Chinese; English
• Published: 26.05.2023
• Subjects: CHEMISTRY; COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSESC01D OR C01F; INORGANIC CHEMISTRY; METALLURGY

The invention provides a method for preparing battery-grade high-purity manganese sulfate through a precipitation and ethanol crystallization process, and belongs to the technical field of manganese sulfate purification. The method comprises the following steps: adding a precipitator at normal temperature, stirring and mixing, sequentially separating calcium and magnesium ions in an industrial manganese sulfate solution by using fluoride, separating potassium and sodium ions by using ferric sulfate, neutralizing iron ions by using manganese carbonate or manganese hydroxide for separation, and replacing and separating cobalt and nickel ions by using manganese powder. According to the method, impurity ions in the solution are preliminarily purified and then are subjected to salting-out crystallization by adopting absolute ethyl alcohol, so that impurities soluble in ethyl alcohol are further dissolved and removed, manganese sulfate crystals can be separated out from the manganese sulfate solution, and the probl