Preparation system of raw material salt in combined alkali production

Abstract

The invention relates to the water treatment technology and soda ash production field, in particular to a preparation system of raw salt in combined alkali production. The system comprises a raw brine pool holding raw brine, an ultrafiltration membrane component, a refined brine pool and a combined alkali production system. The raw brine pool is internally provided with a reaction area for removing calcium and magnesium ions, a precipitation deslagging area for waste residue sedimentation, and a refining area holding the ultrafiltration membrane component. The precipitation deslagging area is communicated with the bottom of the reaction area, and the refining area is communicated with the top of the precipitation deslagging area. The refining area is communicated with a water inlet end of the ultrafiltration membrane component; a water outlet end of the ultrafiltration membrane component is connected to the refined brine pool. The refined brine pool is communicated with the combined alkali production system. The method involved in the invention eliminates a lot of tedious salt-leaching, salt-leaching refined brine refining processes in combined alkali production, lowers the investment cost of combined alkali production, simplifies the production system, and at the same time lowers the production cost.

Description

technical field [0001] The invention relates to the fields of water treatment technology and soda ash production, in particular to a system for preparing raw material salt in combined soda production. Background technique [0002] In the process of producing soda ash and ammonium chloride by the combined soda production method, NaCl is added to the production system in the form of solid. The combined soda production method uses raw salt as the main raw material, but most of the raw salt contains insolubles, calcium, magnesium, iron and other impurities. In order to avoid fluctuations in process operations caused by impurities and affect product quality, the raw salt needs to be refined before it is added to the system so that it can Try to meet the production requirements and lay a good foundation for high-quality and high-yield soda ash and ammonium chloride. Combined soda plants mostly use the washing method to refine raw salt. figure 1 The flow chart shows that the orig...

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Problems solved by technology

[0003] The original washing salt preparation process is long and complicated, and it is difficult to completely remove the mud and sand in the raw salt, and some of them will enter the production system, affecting product quality and increasing the amount of waste mud

At the same time, the washing brine in the salt washing process is continuously closed and used. With the continuous washing of the raw salt, the content of insolubles, iron, calcium, magnesium and other impurities in the washing liquid will gradually increase, and the washing effect will be affected. The raw salt quality of the system will fluctuate

The original technology needs to be equipped with a dirty brine refining process, which will increase production input costs and operating costs. The dirty brine refining process adopts traditional methods, which are complicated, low in efficiency, and large in waste residue

The combined alkali making system and the salt washing system are both closed circulation systems, and the trace water content in the washing saturated brine may cause water expansion in the salt washing process and the soda ash production system, which will affect the normal operation of stable production

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