Integrative method of two-stage acid leaching, washing and filter pressing for manganese powder pickle liquor

Abstract

The invention relates to an integrative method of two-stage acid pickling, washing and filter pressing for manganese powder pickle liquor in a membrane filter press, which is applied to the processing procedures of manganese powder leaching and filter pressing in an electrolytic manganese metal industry. The method comprises the following steps: (1) feeding materials; (2) carrying out acid leaching and washing for anolyte at twice; (3) washing by circulating water; (4) washing by a solution with lower manganese concentration or clear water; and (5) carrying out the filter pressing for a filter cake to finish operation. The invention can reduce manganese carbonate content (calculation by manganese) in an original filter pressing technology for manganese residues in the electrolytic manganese metal industry from 1.5%-2.0% to below 0.6%; manganese sulfate (calculation by manganese) can be reduced to below 0.8% from 1.5%-2.0% and the recovery rate of the ammonium sulfate can reach above 50%. Based on cleaner production idea of controlling a source, the invention recovers the ammonium sulfate by reducing residuals of manganese resource in manganese slag, thus environmental risk of manganese slag landfill is greatly reduced and the utilization ratio of the manganese resource is increased by about 8-14%.

Description

technical field [0001] The invention relates to an integrated method of two-stage acid leaching, washing, and pressure filtration for manganese powder acid leaching liquid, specifically a method for integrating two-stage acid leaching, washing, and pressure filtration of manganese powder acid leaching liquid in a diaphragm filter press. Manganese powder leaching and pressure filtration treatment processes in the electrolytic manganese industry. Background technique [0002] my country is the largest producer of electrolytic manganese in the world, but the production process of electrolytic manganese is extensive, the equipment is outdated, and the degree of mechanical automation is low, resulting in a large amount of available manganese remaining in the manganese slag. The serious waste of manganese resources has accelerated the consumption of manganese resources in my country. At present, all our electrolytic manganese enterprises have not carried out two-stage acid leachin...

AI Technical Summary

Problems solved by technology

Since about 30-35% of the electrolyte solution remains in the pressing, the concentration of manganese sulfate (calculated as manganese) is 30-36g / l, resulting in a higher loss of manganese in the manganese slag, which generally accounts for about 10% of the dry weight of the manganese slag At the same time, about 1.5-2.0% of the manganese carbonate in the manganese slag has not been converted into manganese sulfate in one stage of acid leaching, and only the filter press process, about 3.0-4.0% of the manganese in the manganese ore (accounting for the total manganese 18-25% of the volume) is not utilized

[0003] According to the actual measurement of the Chinese Academy of Environmental Sciences, manganese slag contains a large amount of harmful substances, and the existing stacking method has caused serious pollution to the surrounding water environment and soil environment

Especially the heavy metals in manganese slag not only pollute the environment, but also seriously endanger the health of local residents

[0004] In order to reduce the residual manganese in manganese slag, many enterprises and research institutes have conducted a lot of research, but no actual process for production and application has been seen so far.

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