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Method for recovering rare earth elements from neodymium-iron-boron wastes

A rare earth element and neodymium iron boron technology is applied in the production process of high-efficiency recovery of neodymium iron boron waste, the regeneration and use of rare earth resources, and can solve the problems of rare earth metal impurities, low performance, and rare earth elements not being recycled. , to reduce the production cost, improve the use value, and improve the recovery rate.

Inactive Publication Date: 2011-04-13
BAOTOU XIJUN RARE EARTH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

A considerable part of rare earth elements has not been recycled
In addition, it is generally found in the industry that when producing rare earth metals, rare earth oxides produced from recycled materials will form "slime" near the cathode of the electrolytic cell, which affects the efficiency and service life of the electrolytic cell, and the produced rare earth metals are Contains more impurities, so it is mostly used to produce low-performance NdFeB permanent magnets

Method used

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  • Method for recovering rare earth elements from neodymium-iron-boron wastes
  • Method for recovering rare earth elements from neodymium-iron-boron wastes
  • Method for recovering rare earth elements from neodymium-iron-boron wastes

Examples

Experimental program
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Effect test

Embodiment 1

[0061] Prepare 2000kg of NdFeB waste, mix it with deionized water and grind it to 140 mesh, and the particle size is detected to be more than 95% of the particles larger than 120 mesh. The ground mud is subjected to vacuum filtration to make the water content less than 30%, and oxidized at 800°C-950°C for 2 hours to make the oxidation rate reach more than 98%. The oxidation product is thrown into the reaction tank after secondary grinding, and 5mM of 3mol / L hydrochloric acid is added 3 , Stir and heat to make the temperature of the slurry in the reaction tank reach 90°C, keep it warm for 3 hours, and separate the solid and liquid with a chamber filter press. Transfer the clear liquid to the clarification equipment for use, and then add 1.0m of solid slag 3 water and 0.1m 3 Hydrochloric acid is stirred to wash the slag twice, and the water for the third time is returned to the leaching process for recycling. Finally, after the solid-liquid separation of the chamber filter pre...

Embodiment 2

[0073] 1000kg of NdFeB waste was wet ball milled into 200-mesh mud, oxidized at 800°C for 90 minutes to make the oxidation rate over 95%, put it into the reaction tank after secondary grinding, and added 2.5mol hydrochloric acid 2m 3 , Stir and heat to make the temperature of the slurry in the reaction tank reach 90°C, keep it warm for 3 hours, and separate the solid and liquid with a chamber filter press. Transfer the clear liquid to the clarification equipment for use, and then add 0.5m of solid slag 3 water, 0.1m 3 Stir and wash the slag with hydrochloric acid, and then separate the solid and liquid through a chamber filter press, the clear liquid is merged into the clarification equipment, and the slag is discarded. Then the feed liquid of the clarification equipment is transferred into the preparation container for extracting and removing iron, and the clean rare earth feed liquid is obtained by extracting and removing iron, and the rare earth elements are separated thro...

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Abstract

The invention discloses a method for recovering rare earth elements from neodymium-iron-boron wastes, which comprises the steps of: mixing the neodymium-iron-boron wastes with water and then grinding; oxidizing the ground neodymium-iron-boron wastes; carrying out the secondary grinding for oxidation products; leaching by adding acid; separating solid from liquid; extracting to remove iron; chloridizing rare earth; separating the rare earth by extraction; extracting to remove aluminum; sedimenting; and firing. The method applied to recovery of the rare earth has the beneficial effects that the rare earth recovery rate is increased by 5-8%; the use value of the recovered rare earth is improved so that the production cost of further processing is reduced; the problem of puree fused salt in the electrolysis of single rare earth is solved, and the electrolytic efficiency of the rare earth metal during electrolysis is improved and energy consumption is effectively reduced; and the contents of non rare earth metals, such as C, S, O and the like are reduced.

Description

technical field [0001] The invention relates to the regeneration and use of rare earth resources, in particular to a production process for recycling NdFeB waste with high efficiency, and belongs to the technical field of chemical industry and resource recovery. Background technique [0002] With the rapid development of information industry, consumer electronics industry and new energy electric vehicle industry, the application fields of NdFeB permanent magnet materials are also expanding. Its annual output shows a high-speed growth trend, and it has reached nearly 100,000 tons per year at present, and it is still growing. NdFeB magnets are rich in rare earth resources, containing about 30% of light rare earth elements praseodymium and neodymium, and about 2% of medium and heavy rare earth elements such as dysprosium and terbium. At the same time, before NdFeB magnets enter the final product, various forms of waste will be formed, accounting for about 20-30% of the total r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B59/00C22B7/00
CPCY02P10/20
Inventor 李军张大鸣夏芧栗贾翔平
Owner BAOTOU XIJUN RARE EARTH
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