Method for qualifying industrial ammonium chloride products

Abstract

A method for improving the quality of industrial ammonium chloride products, the steps are as follows: (1) first dissolve ammonium chloride into a saturated solution of ammonium chloride with water at 40-70°C or an unsaturated ammonium chloride solution; (2) then Cool the saturated solution of ammonium chloride to 10-25°C, and precipitate ammonium chloride crystals; (3) pass the ammonium chloride crystallization liquid through a thickener to increase the solid-liquid ratio, then enter the centrifuge for dehydration, and dry to obtain the finished ammonium chloride (4) in the mother liquor I that gets rid of when centrifuge dehydration again, add the not excessive barium chloride solution relative to the sulfate radical in mother liquor I, filter after generating the barium sulfate precipitation, obtain the mother liquor II after filtering, mix mother liquor II After heating up to 40-70°C, it is used to dissolve ammonium chloride and recycled. Compared with prior art, utilize the sulfate radical ion SO in the finished product ammonium chloride that the inventive method obtains 4 2- The content is low, generally below 0.02%. It is a superior product of industrial grade ammonium chloride, suitable for use in batteries and electric chromium.

Description

technical field [0001] The invention relates to a method for improving the quality of industrial-grade ammonium chloride products, in particular to a method for improving the quality of industrial ammonium chloride products by reducing the content of sulfate ion in the ammonium chloride. Background technique [0002] One of the main raw materials for the production of soda ash and ammonium chloride by the combined alkali method is sodium chloride, because sodium chloride contains a certain amount of sulfate ion SO 4 2- , and because there is a small amount of residual hydrogen sulfide H in the desulfurization post of the production system 2 S is oxidized, resulting in high sulfate ion content in the produced ammonium chloride products, generally around 0.04%-0.06%. This kind of ammonium chloride products cannot meet the needs of the production of high-end batteries and electric chromium industries. Therefore, How to Remove Sulfate Ion SO from Ammoni...

AI Technical Summary

Problems solved by technology

Its disadvantage is that the process requires high production input, resulting in high production costs; the removal of sulfate ion SO 4 2- The effect is poor, generally can only make the sulfate ion SO in the raw material sodium chloride 4 2- Reduced to about 0.5%, the sulfate ion SO in the ammonium chloride product produced with this raw material 4 2- The content is about 0.02%-0.03%; and after salt washing, a large amount of sewage will be produced to be discharged, which is not conducive to environmental protection

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