Dechlorination method of chlorine rhodochrosite

Abstract

The invention discloses a dechlorination method of chlorine rhodochrosite, which has been ground into powder before dechlorination. The dechlorination method comprises the following steps: (1) at a room temperature, mixing chlorine rhodochrosite powder with lime slurry sufficiently to obtain mixed slurry; (2) adding sodium carbonate in the mixed slurry obtained from the step (1), and sufficiently mixing at the temperature of 25-40 DEG C; (3) performing the filtration and separation on the mixed slurry after being processed in the step (2) to obtain a precipitate and a filtrate; (4) washing the precipitate obtained from the step (3), and drying at the temperature of 30-80 DEG C to obtain the dechlorinated rhodochrosite powder. Compared with the prior art, the dechlorination method not only can remove chloridions in the chlorine rhodochrosite and prevent the loss due to manganese ion release, but also has the advantages of convenience in raw material source and low cost, and basically has no environmental pollution.

Description

technical field [0001] The invention relates to a method for dechlorinating rhodochrosite containing chlorine. Background technique [0002] In the process of producing manganese metal by electrolysis, chlorine is a harmful impurity element, but it is found to contain chlorine in some rhodochrosite (for example, rhodochrosite in northwest regions such as Xinjiang contains 0.5-1.5% by mass ratio of Chlorine), these chlorine will enter the leachate in the form of chloride ions during the leaching process. During the electrolytic production of manganese metal, these chloride ions tend to be enriched on the electrolytic plate, causing the corrosion rate of the plate to be greatly accelerated, and even "burning the plate" in severe cases, which not only affects the production efficiency, but also increases the production capacity. cost. In addition, a large amount of chlorine gas will be released during the electrolysis process, seriously polluting the environment and endangeri...

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Problems solved by technology

However, since the eluent used in this method is a mixed solution of ammonium sulfate and ammonia water, and its main component is ammonia water ("the quality of ammonium sulfate" only "accounts for 0.2% to 0.6% of the total mass of the mixed solution %"), therefore, when this method overcomes the shortcoming of "a large amount of chlorine gas will be released during the electrolysis of manganese", in the process of "removing chloride impurities", it uses the same method to cause environmental pollution. Polluted ammonia water—even if its "ammonia concentration is 0.01-0.05M", the storage and transportation of ammonia water is very inconvenient, and the ammonia gas released during use is a gas with a strong pungent odor, which endangers environmental safety

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