Method and device for deeply purifying by-product ammonium sulfate solution from diachylon ammonium desulphurization

Abstract

The invention discloses a method and device for deeply purifying a by-product ammonium sulfate solution from diachylon ammonium desulphurization. The method comprises the steps of primary purificationof the ammonium sulfate solution, adjustment of the pH value, evaporative crystallization, deep purification and oxidization. The device comprises a desulphurization by-product storage tank, a quantitative ammonia water adding device, a primary purification reactor, a primary purification filter, a quantitative sulfuric acid adding device, a pH value adjusting reactor, an evaporation crystallizer, a centrifugal machine, a crystallization mother liquor storage tank, a quantitative ammonium sulfide adding device, a quantitative polyacrylamide adding device, a deep purification reactor, a deep purification filter, a quantitative hydrogen peroxide adding device, an oxidization reactor, a pipeline filter and a delivery pump. By means of the method, high-purity ammonium sulfate which meets therequirements for the superior product in GB / T 535-1995 is prepared, and efficient recycling of resources is achieved. According to the method, the ammonium sulfate is recycled from a filtrate obtainedafter purification of diachylon desulfurization mother liquor, and the method has the advantages of being low in energy consumption, high in product purity, economical and environmentally friendly. The situation that waste liquid containing heavy metals is discharged into the environment to cause environmental pollution is avoided.

Description

technical field [0001] The invention belongs to resource recovery and utilization technology, in particular to a method and equipment for deep purification of ammonium sulfate solution, a by-product of the desulfurization of lead paste ammonium method, which is used for the process of recovering regenerated lead from waste lead-acid batteries. Background technique [0002] In the secondary lead industry, lead paste is the most difficult to handle and has the highest content in waste lead-acid batteries, accounting for 35%-45% in flooded batteries and 55%-65% in lean batteries. The traditional method is to convert the lead-containing substances in the lead paste into reduced lead at high temperature (1100-1200°C) by pyrometallurgy. However, high-temperature smelting requires a lot of energy, auxiliary materials and equipment investment. At the same time, the lead recovery rate is low, a large amount of waste residue is produced, the production environment is relatively harsh,...

AI Technical Summary

Problems solved by technology

At present, there is no purification method for the ammonium sulfate solution, a by-product of desulfurization by the ammonium paste method, so a method and equipment for deep purification of the by-product of ammonium paste desulfurization by the ammonium paste method-ammonium sulfate solution have been developed to clean and regenerate the lead paste. The development of the industry is of great significance to promote

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