Method for co-production of feed manganese sulfate by using wastewater of crude indium production

Abstract

The invention discloses a method for co-production of feed manganese sulfate by using wastewater of crude indium production. According to the method, on the basis of production of feed manganese sulfate through a wet method, the influence of excessive sulfuric acid and heavy metals including arsenic, cadmium and the like in the wastewater of the crude indium production through a wet method on the environment is thoroughly eliminated while the feed manganese sulfate is produced, so that the production of crude indium and the feed manganese sulfate through the wet method achieves comprehensive and full utilization of wastes, and the pollution caused by waste acid water containing heavy metals to the environment is thoroughly eliminated. The method comprises the steps of 1, performing leaching reaction on manganese ash in a leaching tank by using indium preparation wastewater; 2, performing pressure filtration; 3, adjusting the pH value of the filtrate to 4-4.5, and then pressing liquid; 4, adding barium sulfide to improve the pH value of a stock solution to 5-5.4, and then filtering; 5, cooling and standing the stock solution, adding an SDD (sodium dimethyl dithiocarbamate) solution and a flocculating agent, then performing pressure filtration, concentrating the filtrate, performing evaporative crystallization, and drying to obtain a feed manganese sulfate product. By adopting the method, the indium preparation wastewater and waste residues causing environmental pollution can be fully and comprehensively used, and a raw material for producing manganese sulfate is provided, so that the method is favorable for reducing the production cost and protecting the ecological environment.

Description

technical field [0001] The invention relates to a method for jointly producing feed manganese sulfate by using waste water from producing crude indium, and belongs to the technical field of chemical environmental protection. Background technique [0002] In our country's existing wet production crude indium technology, it is necessary to discharge waste acid water containing a certain amount of heavy metals such as arsenic and cadmium, which seriously pollutes the ecological environment and cannot be produced normally; because the wet leaching process of wet production of crude indium is used Excessive sulfuric acid, the degree of leaching is relatively enhanced, and at the same time, the leached impurities are relatively more, and the heavy metals such as arsenic and cadmium in the indium-containing materials are relatively more extracted. Although manufacturers of lead, tin, and bismuth-containing filter residues can be dragged away and sold as raw materials for production...

AI Technical Summary

Problems solved by technology

[0002] In our country's existing wet production crude indium technology, it is necessary to discharge waste acid water containing a certain amount of heavy metals such as arsenic and cadmium, which seriously pollutes the ecological environment and cannot be produced normally; because the wet leaching process of wet production of crude indium is used Excessive sulfuric acid, the degree of leaching is relatively enhanced, and at the same time, the leached impurities are relatively more, and the heavy metals such as arsenic and cadmium in the indium-containing materials are relatively more

Although manufacturers of lead, tin, and bismuth-containing filter residues can be dragged away and sold as raw materials for production, waste acid water containing arsenic, cadmium, and other harmful heavy metals is difficult to treat well.

However, when supporting water treatment, the arsenic and cadmium in the discharged wastewater are difficult to meet the standards, and the cost of water treatment is expensive, which is generally unaffordable for small crude indium plants. Therefore, the state does not support the production of small crude indium plants, and direct waste water treatment The crude indium plants in the row were resolutely and severely cracked down, so that the general small crude indium plants were closed due to the great damage to the environment caused by waste acid water and could not produce