Recovery device for recovery of heavy metal in scraps of neodymium iron boron by utilizing saponification and extraction

Abstract

The invention of the creation relates to the technical field of metallurgy, in particular to a recovery device for recovery of heavy metal in scraps of neodymium iron boron by utilizing saponification and extraction. Hydrochloric-acid optimum solubilizing treatment is conducted on the scraps of the neodymium iron boron by utilizing an acid-decomposition device, so that rare earth chloride feed liquid is obtained, and extraction separation is conducted on the rare earth chloride feed liquid by an extraction separating device by utilizing a P507 phosphate extraction agent to obtain rare earth difficult-to-extract components and heavy metal ions; the rare earth difficult-to-extract components enter a second extraction tank, and the aqueous phases of the heavy metal ions enter the second extraction tank of a saponification device; and thus replacement is conducted on the aqueous phases of the heavy metal ions and the rare earth difficult-to-extract components in the second extraction tank, so that heavy metal aqueous phases are obtained, the heavy metal aqueous phases are subjected to treatment by a settling device and a vacuum filtration tank, and heavy metal carbonate solid bodies are obtained. According to the recovery device for recovery of the heavy metal in the scraps of the neodymium iron boron by utilizing saponification and extraction, compared with a traditional resource recovery technology of the scraps of the neodymium iron boron, recovery and using of the heavy metal are increased, so that wasting of resources can be effectively reduced, and the use ratio of resources is improved.

Description

technical field [0001] The invention relates to the technical field of metallurgy, in particular to a recovery device for recovering heavy metals in NdFeB waste by using saponification and extraction. Background technique [0002] NdFeB permanent magnet materials have the characteristics of high magnetism, wide application and rapid development. NdFeB magnets have the characteristics of high remanence, high coercive force and high magnetic energy product, so they are widely used in the fields of electronics, communications, medical equipment, aerospace, automobile industry and industrial automation. In recent years, the output of sintered NdFeB in my country has grown rapidly at an average annual rate of about 15%, accounting for about 50% of the world's total output. In recent years, the state has implemented mandatory plans for the exploitation of rare earth resources and carried out protective development, while the growth of global NdFeB will remain at about 30%. [00...

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Problems solved by technology

[0003] At present, in the production process of recycling rare earths from NdFeB waste resources, heavy metals such as cobalt, nickel, copper, and zinc enter the subsequent wastewater treatment in the form of chlorides, and then use the traditional method of hydrolysis and aggravation of heavy metal scavenger. It is precipitated and mixed with lime slag, and then pulled to the general solid waste landfill for landfill. This method is costly, wastes resources and damages the environment.

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