Method for producing low-salt high-quality soda ash dense

Abstract

The invention provides an improved method for producing low-salt high-quality soda ash dense by taking light soda ash produced by a hot method integrated soda process as a raw material. The low-salt high-quality soda ash dense can be prepared by the following steps of: in the process of producing the light soda ash by using the hot method integrated soda process, controlling the mass fraction of NaCl to be lower than 0.015 percent by adding a washing intermediate product of sodium bicarbonate filter cake so as to enable the mass fraction of light soda ash NaCl to be lower than 0.3 percent; and then producing the low-salt high-quality soda ash dense by taking the low-salt soda ash dense as the raw material and adopting a solid-phase hydration method or extrusion method. The method overcomes the defects that waste liquid of the low-salt soda ash dense produced by an ammonia-soda process has large discharge amount and the low-salt soda ash dense cannot be produced by a united soda production method; the raw material can be crude sea salt and rock salt or can be bittern explored by salt mine solution; in addition, the invention has no water liquid discharge, high quality of product and broad development prospect.

Description

technical field [0001] The invention relates to a method for preparing soda ash. Specifically, it relates to a method for preparing low-salt heavy soda ash with crude brine, and belongs to the industry of soda ash manufacturing, which is a basic chemical raw material. Background technique [0002] The light soda ash produced by industrial synthesis has a density of 0.45-0.79g / cm 3 , the particles are fine, the cost of packaging and storage is high, and the dust is flying when used. Therefore, most of the light soda ash should be processed into heavy soda ash. Heavy soda ash with a bulk density of 0.8g / cm 3 above. In addition, another important quality index to measure heavy soda ash is the salt content. Salt content (referring to NaCl mass fraction, the same below) is low-salt high-quality heavy soda ash if it is lower than 0.3%, and it is ordinary heavy soda ash if it is higher than this value. quality soda ash. When low-salt heavy soda ash is used to make glass, it ca...

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to overcome the shortcomings of the above-mentioned ammonia-soda method to produce low-salt heavy soda ash, which has a large amount of waste liquid discharge, and the combined soda production method cannot normally produce low-salt heavy soda ash, and provides an improved method for producing low-salt heavy soda ash

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