Method of preventing interphase impurity in vanadium-chromium extraction separation process

Abstract

The invention discloses a method of preventing interphase impurity in a vanadium-chromium extraction separation process. The method is characterized by comprising the following steps of: deeply removing impurities in an extracted solution before extraction, such as phosphorus, silicon, calcium, iron, and the like; extracting the purified extracted solution through a mixed solution of an efficient composite amine extracting agent, a demulsifier and a thinner, regulating the pH of the extracted solution, controlling the extraction temperature, the extraction time, the concentration of the extracting agent and the concentration of the demulsifier in the extraction process. According to the method, solid particles possibly generating emulsification in the solution are deeply removed and the demulsifier is added to reduce the emulsification interphase stability when the extraction is finished so as to reduce the probability of inorganic salts in crystallizing on the interphase to form solid interphase membranes. The method can effectively eliminate the interphase impurity in the vanadium-chromium extraction separation process, improve the extraction equilibrium phase splitting speed, reduce the organic phase loss, save the operating cost and ensure the long-term circulation of the extraction system.

Description

technical field [0001] The invention belongs to the field of interface dirt prevention in metal extraction, and in particular relates to a method for preventing interface dirt from occurring in the extraction and separation process of vanadium and chromium. Background technique [0002] With the continuous deepening of environmental protection awareness, the recycling of toxic and harmful substances has become a research hotspot in current scientific research. Heavy metal resources, especially the mining of low-grade ores and the recovery and recycling of a large number of heavy metals have attracted more and more attention. Chromium-containing vanadium slag contains a large amount of rare metals vanadium and chromium. If it is not properly treated, it will pose a great threat to the ecological environment and people's health. Therefore, the vanadium and chromium in it are separated and recovered for recycling. deep meaning. [0003] The separation of vanadium and chromium...

AI Technical Summary

Problems solved by technology

The appearance of dirt at the interface during the extraction process will bring many adverse effects to the entire extraction process. It will seriously prolong the phase separation time, make the separation of vanadium and chromium incomplete, and cause the loss of extraction agent, increase production costs, and seriously Otherwise, the entire workshop will be shut down, making the extraction-stripping cycle impossible

However, dealing with interface fouling is a more challenging problem, because there are many influencing factors of interfacial fouling, such as aqueous phase composition, organic phase composition, external environment and the type of agitator will all promote the system to generate interfacial fouling, and interfacial fouling It is a stable heterogeneous emulsification system, its composition will be different with the change of the system, even in the same system, the composition of the interface dirt produced at different times is different, which is the interface dirt The elimination of the

[0005] Chinese patent CN1048889A discloses a preventive method involving interface emulsification in the separation and purification process of metal yttrium, which is characterized in that sulfide and chloride precipitants are used to remove impurities before extraction; The emulsified layer is settled and centrifuged, and then the different substances in the emulsified layer are separated; CN202671624U utility model patent discloses a device for efficiently separating the emulsified layer; CN101565776A discloses a method for eliminating emulsions in the extraction system of amines and phosphorus, Its feature is to add metal cleaning aids with brand names of CSP-925, CSQ-926 or GEA-746 in the extracted liquid in advance, and extract after stirring, settling, and filtering to remove impurities under certain conditions; US Patent US6500232 also The method of eliminating the interface dirt in the solvent extraction process has been reported, and the patent provides a special device to remove the interface dirt in the extraction process, although this method of separating the emulsified layer is suitable for the elimination of interface dirt in various systems , but it is necessary to add another equipment and an operation, which will increase the operating cost, and it cannot fundamentally eliminate the interface dirt, but only solve the problem to ensure the normal operation of the process

[0007] Based on the above mechanism research, the prevention method of the interface dirt of the system is put forward in a targeted manner. At present, there are no relevant literature reports at home and abroad.

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