Preparation of electronic grade manganese sulfate from leaching solution of ferromanganese slag
(1. School of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China;
2. Innovation Base of Energy and Chemical Materials for Graduate Students Training of Hunan Province,
Changsha 410083, China)
2. Innovation Base of Energy and Chemical Materials for Graduate Students Training of Hunan Province,
Changsha 410083, China)
Abstract: Preparation of electronic grade manganese sulfate from ferromanganese slag, including grinding, leaching and purification, was studied. The impurities, such as Fe3+, Al3+, Ca2+, Mg2+, heavy metal ions and Na+, K+, were removed from leaching solution by neutralized-hydrolysis, fluorination precipitation, sulfuration precipitation and re-crystallization. Effects of pH of reaction, temperature and dosage of the different additives on removal rates of the metallic ions in leaching solution were investigated, and the suitable temperature, pH and the added amount of precipitating agent were obtained. The prepared manganese sulfate product, of which the mass fractions of Ca2+, Mg2+, Na+, K+ are all smaller than 0.005%, the mass fractions of Fe3+, Al3+ and heavy metal ions are smaller than 0.001%, and the mass fraction of Mn2+ is greater than 32%, can meet the demand of anode materials of lithium-ion batteries.
Key words: ferromanganese slag; leaching; purification; manganese sulfate; utilization of solid waste