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Method for recovering rare earth and iron from superfine powder waste produced in NdFeB production process

A production process and ultra-fine powder technology, applied in the electrolysis process, electrolysis components, etc., can solve the problems of high labor intensity, complex process, large waste water, etc., to avoid pollution, simple process, and improve the recovery rate.

Active Publication Date: 2021-05-04
INNER MONGOLIA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these methods not only have complicated processes and high labor intensity, but also produce a large amount of waste water, which puts a lot of pressure on the environment.

Method used

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  • Method for recovering rare earth and iron from superfine powder waste produced in NdFeB production process
  • Method for recovering rare earth and iron from superfine powder waste produced in NdFeB production process
  • Method for recovering rare earth and iron from superfine powder waste produced in NdFeB production process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A method for reclaiming rare earth and iron from the superfine powder waste produced in the NdFeB production process, comprising the following steps:

[0026] (1) The superfine powder waste produced in the NdFeB production process is acid-dissolved with hydrofluoric acid with a mass concentration of 5%, and hydrofluoric acid is added at a ratio of 40mL / g according to the liquid-solid ratio, and fully stirred at room temperature , so that iron oxide is completely dissolved, and rare earth elements form rare earth fluoride precipitation;

[0027] (2) The precipitate is filtered, washed and dried to obtain solid A1 and filtrate B1, A1 is a rare earth fluoride, and B1 is a hydrofluoric acid solution in which iron oxide is dissolved. ICP-AES analysis of B1 shows that the recovery efficiency of each rare earth element is La77.3%, Ce81.7%, Pr99.8%, Nd99.8%, Gd99.8%, Tb99.8%, Dy99.6% , Ho100%. The total recovery efficiency of rare earth is 99.7%;

[0028] (3) The filtrate B1...

Embodiment 2

[0031] A method for reclaiming rare earth and iron from the superfine powder waste produced in the NdFeB production process, comprising the following steps:

[0032] (1) The superfine powder waste produced in the NdFeB production process is acid-dissolved with hydrofluoric acid with a mass concentration of 10%, and hydrofluoric acid is added according to the ratio of liquid to solid ratio of 40mL / g, and fully stirred at room temperature , so that iron oxide is completely dissolved, and rare earth elements form rare earth fluoride precipitation;

[0033] (2) The precipitate is filtered, washed and dried to obtain solid A1 and filtrate B1, A1 is a rare earth fluoride, and B1 is a hydrofluoric acid solution in which iron oxide is dissolved. ICP-AES analysis of B1 shows that the recovery efficiencies of rare earth elements are La79.8%, Ce83.3%, Pr100%, Nd100%, Gd99.8%, Tb99.8%, Dy99.8%, Ho100%. The total recovery efficiency of rare earth is 99.8%;

[0034] (3) The filtrate B1 is...

Embodiment 3

[0037] A method for reclaiming rare earth and iron from the superfine powder waste produced in the NdFeB production process, comprising the following steps:

[0038] (1) The superfine powder waste produced in the NdFeB production process is acid-dissolved with hydrofluoric acid with a mass concentration of 15%, and hydrofluoric acid is added at a ratio of 40mL / g according to the liquid-solid ratio, and fully stirred at room temperature , so that iron oxide is completely dissolved, and rare earth elements form rare earth fluoride precipitation;

[0039] (2) The precipitate is filtered, washed and dried to obtain solid A1 and filtrate B1, A1 is a rare earth fluoride, and B1 is a hydrofluoric acid solution in which iron oxide is dissolved. ICP-AES analysis of B1 shows that the recovery efficiencies of rare earth elements are La80.1%, Ce85.4%, Pr100%, Nd100%, Gd99.8%, Tb99.9%, Dy99.7%, Ho100%. The total recovery efficiency of rare earth is 99.8%;

[0040] (3) The filtrate B1 is ...

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Abstract

The invention relates to a method for recovering rare earth and iron from superfine powder waste produced in the NdFeB production process, comprising the following steps: firstly dissolving the superfine powder waste produced in the NdFeB production process in acid, and Stir to make it react completely, then filter and collect the filtrate and filter residue, wash the filter residue and dry to obtain rare earth fluoride. The method for recovering rare earth and iron from the NdFeB production process of the present invention does not generate waste water, waste gas and waste liquid in the whole process, unreacted hydrofluoric acid can be reused, and the rare earth elements in the ultrafine powder are in the form of rare earth fluorides It is recovered and can be directly used as raw material for electrolytic rare earth. The iron in the filtrate is recovered in the form of iron fluoride or iron oxide through electrolysis. The method greatly improves the recovery rate of the rare earth, and realizes the recovery of both the rare earth and iron in the superfine powder, and at the same time, the method realizes zero waste discharge in the recovery process of the superfine powder.

Description

technical field [0001] The invention belongs to the technical field of rare earth metallurgy, and in particular relates to a method for recovering rare earth and iron from superfine powder waste produced in the production process of neodymium iron boron. Background technique [0002] Because of its excellent magnetic properties, NdFeB permanent magnet materials are widely used in various fields of high-tech industries such as new energy vehicles, wind power generation, medical equipment, military equipment, and electronic products. With the development of these high-tech industries Rapid development, the amount of NdFeB permanent magnet materials will further increase. At this stage, China produces about 150,000 tons of NdFeB permanent magnet materials every year, accounting for more than 80% of the world's total output, and every ton of NdFeB produced will generate about 200-300 kg of waste. These wastes include ultra-fine powder produced in the milling process, oil sludge...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B7/00C22B59/00C25B1/245C25B1/01
CPCC22B7/007C22B59/00C25B1/00C25B1/245
Inventor 杨育圣赵增武兰超群李保卫
Owner INNER MONGOLIA UNIV OF SCI & TECH
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