Method for recovering neodymium and iron from neodymium iron boron oil sludge through two-step co-precipitation

A neodymium iron boron and co-precipitation technology, applied in the direction of improving process efficiency, can solve the problems of human injury, acid-base waste liquid is difficult to handle, not made into industrial products, etc. The effect of the precipitation effect

Active Publication Date: 2013-10-09
BEIJING UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Based on the above current rare earth recovery methods, although these processes can regain rare earths, there are still many problems: first of all, from the results, the circular chain of the above processes does not form a real cycle, and the products obtained by these processes are only Rare earth oxides, but not made into industrial products that can be used directly
Only in the extraction process, because of the need

Method used

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  • Method for recovering neodymium and iron from neodymium iron boron oil sludge through two-step co-precipitation
  • Method for recovering neodymium and iron from neodymium iron boron oil sludge through two-step co-precipitation
  • Method for recovering neodymium and iron from neodymium iron boron oil sludge through two-step co-precipitation

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Experimental program
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Effect test

Embodiment 1

[0025] ①Take 5g of NdFeB sludge, add 60ml of 4mol / L hydrochloric acid to the waste, fully dissolve it, add excess hydrogen peroxide to the filtrate, and heat the oxidized solution to 70°C. Adjust the acidity with 1:2 ammonia water to control the pH value of the solution to 2.

[0026] ② Add excess 0.1mol / L oxalic acid solution under constant stirring, and continue to stir for two minutes; white fine crystal hydrated rare earth oxalate is formed in the solution (the amount of oxalic acid in the final solution is about 1-1% of the total mass of oxalic acid used) 1.5%). Aged at room temperature for 3 hours. Aging is beneficial to reduce the adsorption of impurities.

[0027] ③ After cooling to room temperature, filter with fast filter paper. And wash the precipitate with 1% oxalic acid solution 6-8 times. The precipitate is to be burned; the filtrate and washing liquid are sent to the next process together.

[0028] ④ Dilute the above liquid material to 0.1mol / L (that is, 0....

Embodiment 2

[0037] ①Take 5g of NdFeB sludge, add 60ml of 4mol / L hydrochloric acid to the waste, fully dissolve it, add excess hydrogen peroxide to the filtrate, and heat the oxidized solution to 80°C. Adjust the acidity with 1:2 ammonia water to control the pH value of the solution to 1.5.

[0038] ② Add excessively hot ammonium oxalate (ammonium oxalate solution is made by dissolving 1.5g ammonium oxalate in 20ml water) solution under constant stirring, and continue stirring for two minutes; white fine crystal hydrated rare earth oxalate is formed in the solution. Aged at room temperature for 3 hours. Aging is beneficial to reduce the adsorption of impurities.

[0039] ③ After cooling to room temperature, filter with fast filter paper. And wash the precipitate with 1% oxalic acid solution 6-8 times. The precipitate is to be burned; the filtrate and washing liquid are sent to the next process together.

[0040] ④ Dilute the above liquid material to 0.1mol / L (that is, 0.65 liters), add a...

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Abstract

The invention relates to a method for recovering neodymium and iron from neodymium iron boron oil sludge through two-step co-precipitation, belonging to the technical field of recycling of neodymium iron boron oil sludge. The method comprises the following steps of: dissolving the neodymium iron boron oil sludge by using hydrochloric acid and filtering undissolved substances, and then, controlling a certain pH value and reaction temperature after oxidizing through adding hydrogen peroxide; adding oxalic acid-ammonium bicarbonate and ammonium oxalate-ammonium hydroxide precipitating agent; co-precipitating a neodymium and iron sediment mixture in two steps; and respectively roasting a filtered product at the proper decomposition temperature to obtain neodymium and iron oxides. The neodymium and iron oxides can be used for re-preparing regenerated neodymium iron boron through reducing, forming, sintering and thermal treatment. A complex wet-method process for obtaining single high-purity rare earth in recovery is avoided, and the method is a key step for forming a cycle industry.

Description

technical field [0001] The invention relates to a method for preparing regenerated NdFeB two-step co-precipitated neodymium-iron alloys from NdFeB sludge, and belongs to the technical field of recycling NdFeB sludge. Background technique [0002] Today, one out of every six new technologies is related to rare earths, which fully demonstrates the role and status of rare earths in new technologies. Rare earth is an important strategic resource in the 21st century and the "monosodium glutamate" of modern industry. The reason why rare earth elements are called "strategic elements in the 21st century" is because they have special physical and chemical properties that other elements do not have. Many new rare earth materials made based on these characteristics have excellent performance and are widely used, and are widely used in electronic information, communication technology, automobile manufacturing, energy, aerospace and other fields. Rare earths have been hailed as "materi...

Claims

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Application Information

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IPC IPC(8): C22B7/00C22B3/44
CPCY02P10/20
Inventor 刘敏赖伟鸿索红莉李萌尹小文金琼花岳明刘卫强张东涛马麟王毅
Owner BEIJING UNIV OF TECH
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