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

A technology of by-product salt and bittern, which is applied in the field of salt production, can solve the problems of fine particle size, high impurity content, and different quality of by-product salt products, and achieve the effect of improving quality and reducing content

Inactive Publication Date: 2014-01-08
天津长芦汉沽盐场有限责任公司
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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...

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

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Embodiment Construction

[0016] In order to further understand the invention content, characteristics and effects of the present invention, the following examples are given, and detailed descriptions are as follows in conjunction with the accompanying drawings:

[0017] A method for improving the granularity and purity of bittern chemical by-product salt is carried out sequentially according to the following steps:

[0018] (1) In the brine-mixing crystallization process, the separated salt produced in the separation process in the production process of magnesium sulfate monohydrate and the two-effect salt discharged from the potassium chloride two-effect evaporator are added to the brine-blending crystallizer as crystal seeds, and then Add bitter bittern, the mother liquor of salt making, and old bittern, the mother liquor of potassium chloride, to blend and mix evenly. The mixed brine overflowed from the brine crystallizer is discharged into the settler for sedimentation and clarification, the bitte...

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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...

Claims

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Application Information

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IPC IPC(8): C01D3/06
Inventor 任杰刘立平韩丰
Owner 天津长芦汉沽盐场有限责任公司
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