Novel process for producing manganese sulfate by combination of pyrogenic process and wet process

Abstract

The invention discloses a novel process for producing manganese sulfate by combination of a pyrogenic process and a wet process. The novel process comprises the steps: (1), roasting with anthracite culm to obtain roasted manganese powder; (2), mixing the roasted manganese powder with a secondary solution and / or water for pulping, adding sulfuric acid, adding iron pyrite, performing a thermal reaction, filtering to obtain primary slag and a primary liquid; (3), pulping the primary slag by using water and / or third solution, adding sulfuric acid, adding iron pyrite, performing a thermal reaction, filtering to obtain secondary slag and a secondary liquid, rinsing and filtering the secondary slag to obtain third slag and a third liquid, discharging the third slag; and (4), removing iron from the primary liquid, removing heavy metals, standing, heating and concentrating and crystallizing, dewatering and drying to obtain the manganese sulfate. The novel process has the beneficial effects that (1), the content of full manganese in the manganese slag reaches below 4 percent, the content of tetravalent manganese slag reaches below 0.6 percent, the metal recovery rate reaches above 82 percent, and the mine consumption cost is low; and (2), the main content of a manganese sulfate product reaches above 98.5 percent, the content of a water insoluble is within 0.02 percent, the content of impurities is within 0.3 percent, and the content of heavy metal elements is within 6 ppm.

Description

technical field [0001] The invention relates to a production process of manganese sulfate, in particular to a new process for producing manganese sulfate by fire method combined with wet method. Background technique [0002] Manganese sulfate is a manganese salt product used in feed, fertilizer, paint drier, battery. At present, the production process of manganese sulfate mainly uses pyrolusite as the raw material. A leaching process, followed by oxidative iron removal, sulfide removal of heavy metals, filtration, static precipitation, solution heating and crystallization, centrifugal dehydration and drying, to obtain three grades of manganese sulfate products of industrial grade, feed grade or boutique grade, which are used for chemical fertilizers , feed, paint, pesticides and other fields. [0003] In recent years, most domestic manufacturers generally use fire or wet methods for production. However, the fire-based production of manganese sulfate has the problems of hig...

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Problems solved by technology

However, this method has the problems of poor product quality and low selling price.

In the "Technology Research on the Preparation of Manganese Sulfate by Roasting of Two Ores" published by Zhu Xianxu et al. on "Hunan Nonferrous Metals", the process research on the production of manganese sulfate by direct roasting of pyrolusite and pyrite was introduced, but this method There are problems of high discharge of manganese sludge and high cost

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