Study on the preparation of trimanganese tetraoxide from rhodochrosite
Manganomanganic oxide of high purity is an important industrial raw material electronics manganese zinc oxide soft-magnetic material. With the rapid development of national implementation of "green light" project, televisions, mobile communications, computer and energy-saving lamps, soft magnetic ferrite rapidly growing demand, so that the demand for manganese tetroxide increases rapidly. Therefore, the development of trimanganese tetraoxide has broad prospects.
At present, the production of trimanganese tetraoxide is oxidized. This method uses pure electrolytic manganese metal sheets as raw materials to prepare high-purity trimanganese tetraoxide. It has the advantages of simple process, convenient operation, high manganese recovery and low pollution, but requires electrolysis. Metal manganese is used as raw material and the production cost is relatively high.
Compared with the oxidation method, the direct preparation of the trimanganese tetraoxide process from the primary manganese ore saves the electrolysis process and saves a large amount of power resources, which is of great significance for reducing the production cost of trimanganese tetraoxide and improving the competitiveness of the product.
1 raw materials and reagents
Raw materials: Manganese carbonate ore powder is supplied by Jinrui New Material Technology Co., Ltd. Guizhou Branch, particle size: -100 mesh, chemical composition is listed in Table 1.
Reagents: H2SO4 industrial grade, NH3·H2O industrial grade, SDD industrial grade, NH 4F industrial grade, NH4HCO3 industrial grade
2 Basic principles
Sulfuric acid leaching: The purpose of leaching manganese carbonate ore powder with sulfuric acid is to convert sulfuric acid in the manganese carbonate ore powder into a manganese sulfate solution by using sulfuric acid as a leaching agent. The chemical reaction is: MnCO3+H2SO4→MnSO4+H2O+CO2↑
Manganese sulfate solution purification: manganese carbonate powder containing varying degrees of calcium, magnesium, silicon, iron, aluminum, copper, cobalt, nickel, lead, and other impurities. In the leaching process, the removal of these impurities is carried out in four steps: the first step is oxidative neutralization and hydrolysis to remove iron; the second step is to remove heavy metals such as copper, cobalt and nickel by sulfide precipitation; the third step is fluorination. The precipitation method removes calcium and magnesium; the fourth step is concentrated flocculation and silicon removal.
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