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HomeNewsPreparation of manganese chloride tetrahydrate by leaching hydrochloric acid from waste hydrochloric acid

Preparation of manganese chloride tetrahydrate by leaching hydrochloric acid from waste hydrochloric acid

2019-11-18

Guizhou Zunyi Titanium Factory is China's largest large-scale smelting plant for sponge titanium. It is the leading sponge titanium production plant in China. In the smelting process, a large amount of chlorine gas is generated. In order to reduce environmental pollution, water is used to remove chlorine. This produces a large amount of waste Hydrochloric Acid. The concentration of this waste acid is about 20%, which is difficult to handle, and because the waste acid contains a large amount of impurities. Therefore, there are certain difficulties in recycling it. It is imperative to solve the problem of waste hydrochloric acid in titanium plants. As one of China's Guizhou province's mineral resources, its reserves of manganese ore of living in a third country. The manganese ore resources in Guizhou Province are mainly distributed in Zunyi and Songtao. With the serious disorderly Mining in recent years, the grade of manganese ore resources has gradually decreased. In this low-grade rhodochrosite as metallurgy, chemical industry raw materials, difficult to be exploited. Because most of the manganese ore resources in Guizhou Province are characterized by poverty, fineness and miscellaneous, there is certain difficulty in mineral processing . The comprehensive utilization of low-grade manganese ore resources in Zunyi and Songtao has always been a concern of researchers in metallurgical and chemical industries. The problem. Therefore, the authors propose an experimental scheme for the preparation of manganese chloride tetrahydrate from low-grade rhodochrosite in Zunyi by using hydrochloric acid waste hydrochloric acid. The single factor method is used to investigate the leaching temperature, leaching time, liquid-solid ratio and acid excess coefficient. The effect on manganese leaching rate.

First, the experiment

(1) Principle The leaching reaction of rhodochrosite and hydrochloric acid is mainly the reaction process of manganese carbonate and hydrochloric acid in rhodochrosite, and the components of Fe2O3, FeO, CaO and MgO in rhodochrosite can also be reacted with hydrochloric acid to dissolve into solution. The main reaction equation is as follows: MnCO3+2HCl(1)=MnCl2+H2O+CO2 △G@=-100.661KJ/mol) Calculate the Gibbs free energy ΔG Material W(Mn)/% W of the above reaction (Fe2+)/% W(Fe)/% Rhodochrosite 19 5.6 10 Psilomelane massive 28 - - Manganese dioxide 42 - - 3) Method and process by stirring and leaching, that is, hydrochloric acid and Sulfuric Acid slag are formulated according to a certain liquid-solid ratio The leachate is carried out under heating conditions, and then subjected to filtration purification to obtain a manganese chloride tetrahydrate product, and the process flow is shown in FIG.

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