Effect of alkali types during iron precipitation on manganese sulfate crystallization from Indonesian manganese ore.

NMC is a lithium-ion battery that combines three primary metals, namely Nickel, Manganese, and Cobalt. Manganese metal is used in the form of manganese sulfate (MnSO4). This research has studied the effect of adding alkali in the precipitation of impurities from the solution of manganese ore leaching on the crystals of MnSO4 as raw material for the manufacture of NMC. Some manganese ores are leached using oxalic acid as a reducing agent in a sulfuric acid atmosphere. Then, the impurities (mainly iron) precipitation from pregnant leached solution was carried out with pH adjustment using various alkalis. The alkalis used in this study were NaOH, NH4OH, and Ca(OH)2. The MnSO4 products were characterized using XRF and XRD. The results showed that the use of Ca(OH)2 in the precipitation of iron and other impurities from the pregnant leached solution could provide better MnSO4 crystals than the use of NaOH and NH4OH. [ABSTRACT FROM AUTHOR]