Method for separating crystal slurry in synthetic heavy soda ash procedure

Abstract

A process for separating crystal from slurry in the procedure of synthesizing heavy sodium carbonate includes such steps as synthesizing heavy sodium carbonate in carbonizing tower, loading the reaction liquid in the thickening equipment, continuously growing crystal grains, loading the solid-liquid mixture in alkali filter for separation, calcining the solid to obtain finished product, and returning the clean liquid back to system.

Description

technical field [0001] The invention relates to a method for preparing alkali metal carbonate, in particular to a method for separating crystal slurry in the process of synthesizing heavy soda ash. Background technique [0002] In the prior art, such as the ammonia-soda method and combined soda method to produce heavy soda ash, its traditional technology is that the reaction feed liquid taken out from the carbonization tower directly enters the soda filter for separation, and then is calcined to obtain a finished product. The disadvantages are: The crystal grains in the reaction feed liquid are small. When entering the alkali filter for filtration and separation, part of the fine crystal grains and part of the heavy alkali dissolved in the mother liquor cannot be separated, and flow out with the mother liquor, resulting in a low yield. It is difficult to reduce the amount of washing water without changing. The solid-liquid ratio of the reaction materia...

AI Technical Summary

Problems solved by technology

[0002] In the prior art, such as the ammonia-soda method and combined soda method to produce heavy soda ash, the traditional process is that the reaction feed liquid taken out of the carbonization tower directly enters the soda filter for separation, and then is calcined to obtain a finished product. The disadvantages are: The crystal grains in the reaction feed liquid are small. When entering the alkali filter for filtration and separation, part of the fine crystal grains and part of the heavy alkali dissolved in the mother liquor cannot be separated, and flow out with the mother liquor, resulting in a low yield. Difficult to reduce with the same amount of washing water

The solid-liquid ratio of the reaction material-liquid mixture taken out will directly affect the production efficiency of the alkali filter machine. If the solid-liquid ratio is low, the production capacity of the alkali filter machine will be insufficient; if the solid-liquid ratio is high, the production process will be increased. When the amount of water remains the same, it is not conducive to reducing the salinity of heavy alkali