Sodium sulfate and sodium chloride production process

Abstract

A sodium sulfate and sodium chloride production process is as follows: a sodium sulfate and sodium chloride solution is taken as a raw material liquid, after heat transfer heating of condensation water and high temperature nitrate making mother liquor in high temperature nitrate making process, the high temperature nitrate making is performed by high temperature mechanical compression evaporation at 80-150 DEG C, solid sodium sulfate and the high temperature nitrate making mother liquor are obtained by separation; after heat transfer of the high temperature nitrate making mother liquor and the raw material liquid, low temperature mechanical compression evaporation is performed at 40-60 DEG C, then solid sodium chloride and low temperature salt making mother liquor are obtained by separation; and after heat transfer heating of the low temperature salt making mother liquor and the condensation water and the high temperature nitrate making mother liquor in the high temperature nitrate making process, the high temperature mechanical compression evaporation is performed circularly. The process has no discharge of waste liquid, and has the characteristics of strong adaptability of raw materials, low production cost, high product quality, and no three waste discharge, the normal production needs no boiler to supply steam, the comprehensive energy consumption is reduced, the service life of mines is prolonged, the pollution discharge is reduced, and the sodium sulfate and sodium chloride production process is more environmentally-friendly.

Description

technical field [0001] The invention belongs to the technical field of inorganic salt preparation, in particular to a production process of sodium sulfate and sodium chloride. Background technique [0002] Sodium sulfate and sodium chloride are generally used chemical raw materials. At present, there are two methods for producing solid sodium sulfate and sodium chloride from a solution containing sodium sulfate and sodium chloride, namely, the multiple-effect evaporation nitric acid mother liquor recovery method and Multi-effect evaporation nitric acid mother liquor discharge method. However, the disadvantage of the multi-effect evaporation mother liquor recovery method is that it needs to configure a large-capacity boiler and produce a large amount of pollutants such as carbon dioxide and sulfur dioxide. The disadvantage of the multi-effect evaporation mother liquor discharge method is that it requires a large-capacity boiler and produces A large amount of pollutants such ...

AI Technical Summary

Problems solved by technology

However, the disadvantage of the multi-effect evaporation mother liquor recovery method is that it needs to configure a large-capacity boiler and produce a large amount of pollutants such as carbon dioxide and sulfur dioxide. The disadvantage of the multi-effect evaporation mother liquor discharge method is that it requires a large-capacity boiler and produces A large amount of pollutants such as carbon dioxide and sulfur dioxide, and the consumption of raw brine is high, and the high-salt mother liquor is discharged into the mine. After the mother liquor is discharged into the mine, the amount of salt enriched will affect the quality of the brine and shorten the service life of the mine.

Therefore, the above two processes are difficult to adapt to the national policy requirements of scientific development of energy saving and emission reduction

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