Integrated energy-saving Yuan Ming powder recovery device and preparation method thereof

Abstract

The invention discloses an integrated energy-saving anhydrous sodium sulphate recovery device, which comprises a membrane concentration system, an integrated normal-temperature crystallization system,a centrifugal machine and a drying machine connected sequentially. The membrane concentration system comprises a transformation membrane concentration unit, a liquid inlet pipe, a clear liquid discharge pipe, a concentrated liquid discharge pipe and an energy storage tank; one end of the transformation membrane concentration unit is connected with the liquid inlet pipe; the other end of the transformation membrane concentration unit is connected with the clear liquid discharge pipe and the concentrated liquid discharge pipe; the integrated normal-temperature crystallization system comprises an integrated normal-temperature crystallizer, a salt conveying hopper and a crystallization circulating pump; the integrated normal-temperature crystallizer comprises a dissolving chamber and a crystallizing chamber connected sequentially; the salt conveying hopper is used for feeding sodium chloride solids into the dissolving chamber. According to the integrated energy-saving anhydrous sodium sulphate recovery device disclosed by the invention, only saline water containing sodium sulfate is required to be concentrated to a certain concentration instead of saturation concentration through themembrane concentrating system, so that a lattice distortion agent is not needed to be added into a system, crystallization is carried out at normal temperature, and the process is simple.

Description

technical field [0001] The invention relates to the field of recovering sodium sulfate from brine, in particular to equipment and methods for desulfating sodium from light brine after electrolysis in the chlor-alkali industry. Background technique [0002] In the chlor-alkali industry, the sulfate radicals in the light brine were electrolyzed. The main early processes were barium method or calcium salt-chemical precipitation method and membrane method concentration plus freezing process. [0003] The chemicals added by the chemical precipitation method are mainly barium salt or calcium salt. The barium salt itself is toxic, which will cause great harm to the environment and people. The work intensity is high during operation. If leakage occurs, it will cause serious environmental pollution, and production Secondary fouling, blockage of pipelines, resulting in fouling of the ionic membrane, shortening the life of the ionic membrane, currently many manufacturers are not using ...

AI Technical Summary

Problems solved by technology

However, the process requires the sodium sulfate in the system to be concentrated to supersaturation through the membrane, so that sodium sulfate can be easily precipitated, and there is no problem in operation, but due to the osmotic pressure, the operating pressure of the system is relatively high, and the production requirements of the equipment are also high. It is relatively high, and at the same time requires the addition of lattice distortion agents, which makes the operating cost relatively high

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