A kind of treatment method of sodium tetrachloroaluminate solid slag

Abstract

The invention relates to a treatment method of sodium tetrachloroaluminate solid slag. The treatment method comprises the following steps: (1) mixing sodium tetrachloroaluminate solid slag with water for dissociation, and then adding a separating agent to separate out chlorine hexahydrate Aluminum chloride, or sodium tetrachloroaluminate solid slag is directly mixed with a separating agent for dissociation, and aluminum chloride hexahydrate is separated out, and then aluminum chloride hexahydrate solid and a filtrate are obtained through a solid-liquid separation; (2) The first filtrate is concentrated and crystallized, and the second solid-liquid separation is carried out to obtain sodium chloride solid and the second filtrate. The treatment method does not need to introduce an organic solvent, and there is no cross-contamination, and the cost can be reduced; and the aluminum chloride and sodium chloride obtained by dissociating the solid slag of sodium tetrachloroaluminate are fully recovered, and the sodium tetrachloroaluminate is realized. The high resource utilization of solid slag can also return the obtained secondary filtrate to the solid slag dissociation stage to provide a separating agent, which embodies the concept of circular economy and has the advantages of simple process flow and easy operation.

Description

technical field [0001] The invention relates to the technical field of inorganic chemistry, in particular to a method for treating solid slag of sodium tetrachloroaluminate. Background technique [0002] Methylphosphine dichloride is an important organic chemical intermediate, which is widely used in pesticides, medicines, synthetic materials and other fields. At present, domestic synthesis techniques for preparing methylphosphine dichloride mainly include the ternary complex method and the alkylaluminum method. However, no matter which synthesis process, after the separation of the product methyl phosphine dichloride, a large amount of solid waste will be produced, the main component of which is sodium tetrachloroaluminate, and a small amount of organic phosphine and other impurities. Since sodium tetrachloroaluminate is easily soluble in water, solid waste is often discharged directly after being dissolved in water, which will not only cause great pollution to the environ...

AI Technical Summary

Problems solved by technology

The method not only does not separate aluminum and sodium before the high-temperature reaction, but a large amount of phosphoric acid or phosphate needs to be added to the high-temperature reaction, which increases the processing cost, but also belongs to the high-temperature reaction with high energy consumption, and the product obtained by the high-temperature reaction is Mixture of sodium phosphate and aluminum tripolyphosphate, difficult to separate

[0007] In summary, the treatment methods disclosed in the prior art all have disadvantages such as complex process, high cost, and risk of cross-contamination. Therefore, it is urgent to develop an effective treatment method for sodium tetrachloroaluminate solid slag method to achieve the purpose of cost reduction, efficient and thorough resource utilization of sodium tetrachloroaluminate solid slag

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