Abstract: A new purification process of industrial manganese sulfate was expounded emphatically.The specific details were presented as follows：the calcium-magnesium was removed by adding manganese fluoride in solution at first；then the ferrum was oxidated by potassium permanganate and purificated through hydrolyzation.Experiment results showed that the purification had good effect on the removal of calcium-magnesium and ferrum.MnO₂ was prepared by using a liquid co-precipitation method with the pre-purified manganese sulfate as a source of manganese，and finally LiMn₂O₄ products were successfully prepared.X-ray diffraction（XRD） and scanning electron microscopy（SEM） results showed the particles of as-synthesized LiMn₂O₄ products were small microspheres and X-ray diffraction peaks corresponded well to the Fd3m spinel structure. 

Key words: manganese sulfate, purification, manganese fluoride, LiMn₂O₄