PROCESS FOR PRODUCING MANGANESE COMPOUND, POTASSIUM SULFATE AND FERTILIZER FROM MATERIAL COMPRISING POTASSIUM AND MANGANESE

摘要

The present invention relates to a method for manufacturing a high-purity manganese compound, potassium sulfate and a fertilizer from a material containing low-purity manganese and potassium. The method for manufacturing a high-purity manganese compound, potassium sulfate and a fertilizer from a material containing low-purity manganese and potassium according to the present invention comprises the steps of: separating a first solid from a first potassium leachate including potassium hydroxide via a first solid-liquid separation after adding water to a material containing low-purity manganese and potassium; removing a first foreign material by adding sulfide to the first potassium leachate and manufacturing high-purity potassium sulfate by adjusting pH using sulfuric acid; obtaining a first manganese leachate by adding hydrochloric acid and a reducing agent to the solid and obtaining a second manganese leachate by removing a second foreign material using sulfide and potassium hydroxide; manufacturing high-purity trimanganese tetraoxide from the second manganese leachate by adjusting pH using potassium hydroxide; obtaining a third manganese leachate from the first manganese leachate by removing a third foreign material using sulfide; and manufacturing high-purity manganese sulfate monohydrate from the third manganese leachate by adding sulfuric acid after adjusting pH using potassium hydroxide.