Author(s)

Hui Zhang, Da Song, Zejiang Wang, Qi Zhang and Xiping Huang

Corresponding Author

Da Song

ABSTRACT

Manganese sulfate is an important chemical raw materials, which is always prepared by sulfuric acid leaching of manganese ore stone. The impurities in ore shall enter into the solution and product along with manganese, especially calcium and magnesium impurities. Solubility determinations of calcium in water and acid solution have been carried out from 303.15K to 373.15K. The calcium solubility increased with the addition of sulfate acid. The data also increased with the increase of temperature until 353.15-363.15K, then the values decreased after the peak. A new method to remove Ca2+ impurity has been raised on base of the fundamental data. The removal ratio of Ca2+ impurity was as high as 59%. Purity of manganese sulfate was higher than the industry standard.

KEYWORDS

Manganese sulfate, calcium impurity, acidification process, crystallization, manganese ore