Manganese sulfate multi-effect evaporative crystallization production process

Abstract

The invention provides a manganese sulfate multi-effect evaporative crystallization production process, and relates to the technical field of manganese sulfate evaporative crystallization. The manganese sulfate multi-effect evaporative crystallization production process comprises the steps of liquid preparation, first-effect evaporation, second-effect evaporation, heat preservation and standing, water removal and centrifugation and the like. According to the method, the defects in the prior art are overcome, efficient crystallization of manganese sulfate is achieved in a double-effect evaporation mode, meanwhile, waste of water resources is reduced, and the production cost is reduced.

Description

technical field [0001] The invention relates to the technical field of manganese sulfate evaporation crystallization, in particular to a production process for manganese sulfate multi-effect evaporation crystallization. Background technique [0002] Manganese sulfate is a traditional manganese salt product widely used in fields such as fertilizer, feed, paint and pesticide. At present, the domestic manganese sulfate production process mainly uses pyrolusite as raw material, which is divided into two reduction leaching technologies: carbon fire reduction and wet reduction (pyrite, ferrous sulfate and other reducing agents) and acid leaching. Potassium and sodium are removed by the alum method, iron is removed by oxidation and hydrolysis, heavy metals are removed by sulfide, calcium and magnesium are removed by fluoride, the manganese sulfate solution after impurity removal and purification is obtained by standing precipitation and filtration, and the manganese sulfate solutio...

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Problems solved by technology

[0003] Traditional evaporation, concentration, and crystallization use evaporation tanks, so that the proportion of energy costs in it cannot be seen when the output is relatively small, but with the increase in the output of manganese sulfate and the rise in energy prices, it is obvious that the energy The cost is too high. According to the different extraction processes, about 3~4 tons of water need to be evaporated to obtain one ton of manganese sulfate monohydrate. If the calculation is based on 3 tons, if the evaporation tank is used, the steam consumption is about 3.3 tons.

[0004] The patent number is CN201310526375.7 "A method for preparing high-purity manganese sulfate by recrystallization", which adopts the method of recycling condensed water to reduce the waste of water resources, but in the actual use process, acidity adjustment and repeated remelting and crystallization are required , the procedure is relatively complicated, the actual operation wastes manpower and material resources, and is not suitable for mass production

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