System and technology for recovering sodium nitrate from tin-containing waste liquid treatment tail water

Abstract

The invention relates to a system and a technology for recovering sodium nitrate from tin-containing waste liquid treatment tail water. The system for recovering sodium nitrate from tin-containing waste liquid treatment tail water comprises a waste water storage pool, a purification refining device, a multi-effect evaporator, a filter, a crystallization device, a centrifugal machine and a drying machine. The technology for recovering sodium nitrate from tin-containing waste liquid treatment tail water comprises the following steps of collecting tin-containing waste liquid treatment tail water, storing the collected tin-containing waste liquid treatment tail water in the waste water storage pool, feeding the tin-containing waste liquid treatment tail water in the waste water storage pool into the purification refining device to carry out purification refining, feeding the tin-containing waste liquid treatment tail water subjected to purification refining into the multi-effect evaporator, feeding steam into the multi-effect evaporator to carry out circulation evaporation, feeding the steam obtained by the previous step into the filter to carry out heat filtration, feeding the filtrate into the crystallization device to carry out crystallization to obtain crystals, carrying out centrifugation of the obtained crystals by the centrifugal machine to obtain solid slag and a mother solution, transferring the solid slag to the drying machine to carry out drying to obtain a sodium nitrate finished product, and feeding the mother solution back to the waste water storage pool for recycle. The system for recovering sodium nitrate from tin-containing waste liquid treatment tail water has the advantages of relatively low recovery cost, simple and convenient operation management, long-term and stable operation and no discharge of pollutants.

Description

technical field [0001] The invention belongs to the fields of inorganic salt recovery, comprehensive utilization, environmental protection technology and chemical industry, and relates to tail water reprocessing technology in the treatment system of electroplating tin stripping water or tin stripping liquid, in particular to a method for recovering nitric acid from tin-containing waste liquid treatment tail water Sodium recovery system and recovery process. Background technique [0002] With the rapid development of human industry and urbanization, the problem of environmental pollution is becoming more and more serious. Countries around the world have higher and higher requirements for environmental protection and the discharge of industrial pollutants. Under the situation of shouting for energy saving and emission reduction, my country's electroplating, Heavy polluting enterprises such as chemicals and circuit boards are facing severe challenges. [0003] Nitrate (NO 3 -...

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Problems solved by technology

[0007] Before the present invention is made, in the prior art, some theoretical researches have obtained certain progress, but there is still a certain distance from practical application, and need to be constantly perfected, optimized and developed; some technological methods are more mature, but the biggest problem of existence is Wastewater treatment costs are relatively high

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