The production process of manganese trioxide (Mn3O4)
Release time:
2021-08-03 14:49
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Industry News
Manganese tetroxide is one of the important raw materials for the preparation of soft magnetic materials such as manganese zinc ferrite. The existing technologies for preparing manganese tetroxide include roasting, reduction, oxidation, and electrolysis. The method of preparing manganese tetroxide using manganese sulfate solution involves adding alkaline substances to the manganese sulfate solution to convert it into Mn(OH)2, and then using an oxidizing agent or oxygen/air to oxidize the manganese hydroxide in the solution to obtain manganese tetroxide.
Manganese tetroxide has been produced in China since 1997 and has developed rapidly, currently achieving an annual production scale of nearly 40,000 tons. However, due to poor quality, the products mainly supply the domestic market, with only a small portion exported. Currently, the domestic production method for manganese tetroxide can only use the oxidation method of metallic manganese powder, with the technical principle originating from a US patent (US4812302). The main issues with the current process are: low technical content; high production costs, about 13,000 yuan per ton, while the selling price is about 15,000 yuan per ton, leaving almost no profit; uneven particle size, with a diameter greater than 2mm; and generally high impurity content, only able to produce ordinary grade products. The high impurity content is mainly due to the impurities brought in by the raw material, electrolytic metallic manganese powder, which requires a complex production process. It is difficult to effectively avoid the entry of certain impurities at each stage, making it hard to fundamentally reduce the impurity content in manganese tetroxide. The methods for producing manganese tetroxide abroad also mainly use the oxidation method of metallic manganese powder, in addition to methods for preparing ultra-pure manganese tetroxide, but the technology is strictly confidential, and the specific methods are not yet known.
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