At present, the electrolytic manganese metal production are mainly composed of 99.7% of the products (now most manufacturers actual has reached more than 99.8%), only a few manufacturer produces 99.9% of the products (as 99.9% of the product market demand is small, but a lot of enterprises in the feasibility study report are in the production of 99.9%), the main raw material for manganese oxide and manganese carbonate two categories - manganese ore, in addition to the former system of process fluid way is not the same, the electrolysis process are basically the same.
Manganese carbonate ore is directly using sulfuric acid and manganese carbonate reaction to produce manganese sulfate solution, and then through a series of processes such as neutralization, purification, filtration and so on to prepare electrolyte, after adding additives such as selenium dioxide, ammonium sulfite and so on can be entered into the electrolytic cell for electrolysis;Using electrolytic manganese manganese dioxide production technology and process of manganese carbonate with different, mainly manganese dioxide does not react with sulfuric acid under general conditions, must be treated as the bivalent manganese and then react with sulfuric acid to the preparation of manganese sulfate solution, its processing method for general roasting method, it is manganese dioxide and reducing agents (coal) is commonly airtight heating after mixed together, in a certain temperature under C will four price reduction for the bivalent manganese, after reaction with sulfuric acid, this method is called roasting method;Another method is called two ore method, that is, using manganese dioxide ore powder and pyrite under the action of sulfuric acid REDOX reaction to prepare manganese sulfate.However, these two methods are generally not adopted in the industry due to their high cost. Among them, roasting method is more common than two-ore method. However, the roasting furnace used by many roasting production plants is simple and easy to manufacture, but the reflection furnace with high energy consumption and large pollution, so it is not recommended to adopt them.
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