Method for improving granularity and purity of chemical salt byproducts of acrid bittern

Abstract

The invention discloses a method for improving the granularity and the purity of chemical salt byproducts of acrid bittern. The method comprises a brine mixing crystallization procedure, a countercurrent washing procedure, a primary dehydration procedure, a secondary dehydration procedure and a drying procedure. According to the method, the problems of lower granularity and low purity of the chemical salt byproducts of the acrid bittern are effectively solved; proper process measures are taken to collect three salt byproducts to one place for production; a brine mixing crystallizer and countercurrent washing equipment are used for remarkably improving the granularity and quality of the salt byproducts to a first-grade state refined salt standard. According to the technical scheme, changes in the ratio of potassium to magnesium in brine are avoided, and the technical scheme can be smoothly implemented in an acrid bittern chemical enterprise. By a mixing crystallization process, the sodium chloride content of mixed brine is lowered, and the quality of a downstream product can be more favorably improved.

Description

[0001] Field [0002] The invention relates to a method for producing salt, in particular to a method for increasing the granularity and purity of bittern chemical by-product salt. Background technique [0003] In the existing bittern chemical production process, some by-product salts are often produced along with the production of potassium chloride products, which are the bitter salt precipitated during the precipitation of bittern in the production of potassium chloride and the secondary salt precipitated during the evaporation of potassium chloride. Salt and magnesium sulfate monohydrate are separated during the production of three by-product salts. Among them, the bitter salt has small particles and contains impurities such as organic residues, which makes the color black and yellow, and the quality is poor. Most of them are discarded as industrial waste. Second-effect salt usually enters the refined salt workshop through washing and dehydration processes to produce wet...

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problem of low particle size and purity of by-product salt in bittern chemical industry and low economic value, the present invention provides a method for improving the particle size and purity of by-product salt in bittern chemical industry, which effectively solves the problem of different quality of by-product salt The problem of high impurity content and fine particle size has significantly improved product quality

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