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Method for recycling rare earths from waste neodymium-iron-boron material

A kind of neodymium iron boron and waste technology, which is applied in the field of recycling neodymium iron boron materials

Inactive Publication Date: 2012-11-14
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The common problem of these methods is that rare earth precipitation is not easy to complete, and impurity ion co-precipitation occurs.
At the same time, in order to obtain high-purity rare earth compounds, it is often necessary to precipitate and redissolve rare earths, and then carry out extraction, separation and purification. For the process, see Figure 2; the process has many steps, complicated operation, low rare earth recovery rate and high production cost

Method used

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  • Method for recycling rare earths from waste neodymium-iron-boron material

Examples

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Effect test

example 1

[0022] [Example 1] After crushing 10.0g of NdFeB waste (containing 2.92g of rare earth) to more than 100 mesh, dissolve it with 120mL, 4mol / L hydrochloric acid, and then adjust it with concentrated ammonia water: water with a volume ratio of 1:2. When the pH value reaches 2.0, add a saturated ammonium sulfide solution of 1.1 times the theoretical requirement in a water bath at 60°C, filter, add hydrochloric acid to acidify until no bubbles are generated, and after heating for 10 minutes, the ICP method detects that the content of rare earth elements accounts for all metals 94.563wt.% of ions.

example 2

[0023] [Example 2] After crushing 10.0g of NdFeB waste (containing 2.92g of rare earth) to more than 100 mesh, dissolve it with 80mL, 6mol / L hydrochloric acid, and then adjust it with concentrated ammonia water: water with a volume ratio of 1:2 When the pH value reaches 3.0, add a saturated ammonium sulfide solution of 1.2 times the theoretical requirement in a water bath at 60°C, filter, add hydrochloric acid to acidify until no bubbles are generated, and after heating for 10 minutes, it is detected that the content of rare earth elements accounts for the proportion of all metal ions 98.197wt.%.

example 3

[0024] [Example 3] After crushing 10.0g of NdFeB waste (containing 2.92g of rare earth) to more than 100 mesh, it was dissolved with 96mL, 5mol / L hydrochloric acid, and then adjusted with concentrated ammonia water: water with a volume ratio of 1:2. When the pH value reaches 2.5, add a saturated solution of ammonium sulfide 1.15 times the theoretical requirement in a water bath at 60°C, filter, add hydrochloric acid to acidify until no bubbles are generated, and after heating for 10 minutes, it is detected that the content of rare earth elements accounts for the proportion of all metal ions 98.032wt.%.

[0025] To further obtain high-purity rare earth compounds, the solution obtained in the final step of the above example can be directly extracted, separated and purified.

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Abstract

The invention relates to a method for recycling rare earths from a waste neodymium-iron-boron material, belonging to the technical field of recycling of neodymium-iron-boron materials. The method comprises the following steps: finely grinding a waste neodymium-iron-boron material, and separating out undissolved B element by a hydrochloric acid selective dissolution process; regulating the pH value of the obtained liquid to 2.0-3.0 with ammonia water; adding an ammonium sulfide solution into a 50-70 DEG C water bath, and reacting for more than 2.0 hours to sufficiently precipitate metal cation impurities under the action of ammonium sulfide; carrying out centrifugal filtration, wherein the filtrate mainly contains rare earth ions and chloride ions; and dropwisely adding hydrochloric acid into the filtrate until no bubbles are generated, heating for more than 10 minutes. The invention saves the trouble of intermediate ignition and secondary dissolution in order to perform extraction and purification in the past technique, and can be directly used for extraction and purification, thereby enhancing the recycling rate, simplifying the production process and lowering the production cost.

Description

technical field [0001] The invention relates to a method for recovering rare earths from waste NdFeB materials, and belongs to the technical field of NdFeB material recovery. technical background [0002] NdFeB permanent magnet material is a kind of permanent magnet material with superior performance. It is recognized as the "magnet king" because of its high remanence, high coercive force and high magnetic energy product. During the processing and production of NdFeB permanent magnet products, a large amount of debris, leftovers or waste composed of substandard products will be produced; on the other hand, NdFeB products will also produce some due to corrosion or other reasons during use. Scrap. The content of rare earth elements in NdFeB alloy is generally about 30%, which is several times or even dozens of times higher than that in raw ore; the content of iron is 60-65%. The main rare earth element contained in the above rare earth elements is Nd, and there are also Pr-N...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B3/10C22B3/44C22B3/26C22B59/00
CPCY02P10/20
Inventor 刘敏董传博索红莉赖伟鸿金琼花岳明刘卫强张东涛林红引王雁马麟王毅
Owner BEIJING UNIV OF TECH
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