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Method of extracting rare earth elements in neodymium iron boron waste by employing rare earth extraction raffinate

A rare earth element and raffinate technology is applied in the field of leaching rare earth elements from NdFeB waste by using rare earth raffinate, which can solve the problems of increasing recycling cost, wasting valuable elements, polluting the environment, etc., and achieving the effect of simple implementation.

Inactive Publication Date: 2017-08-04
XUNWU HENGYUAN TECH DEV CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the prior art, the method of leaching the rare earth elements in the NdFeB waste with the rare earth raffinate not only increases the recycling cost, but also wastes a large amount of valuable elements, which seriously pollutes the environment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 2

[0028] A method for leaching rare earth elements in NdFeB waste using rare earth raffinate in this embodiment consists of the following steps:

[0029] (1) The first step: the feed liquid is collected, and the rare earth raffinate is collected and put into a reaction tank;

[0030] (2) The second step: pretreatment, the rare earth raffinate in (1) is subjected to high-temperature distillation, and the distillation temperature is 1200 degrees Celsius to obtain pure rare earth raffinate;

[0031] (3) The third step: grinding, grinding the NdFeB waste into powder;

[0032] (4) Step 4: Oxidation, the medium-sized NdFeB waste powder in (3) is roasted and oxidized in a rotary kiln, and the roasting and oxidation time is 3 hours.

[0033] (5) The fifth step: mixing, mixing (4) and (2) in a ratio of 2:1;

[0034] (6) The sixth step: pressurizing, pressurizing the mixture of (5) under high pressure for 1 hour; the pressurizing pressure is 5 atmospheres.

[0035] (7) The seventh step...

Embodiment 3

[0037] A method for leaching rare earth elements in NdFeB waste using rare earth raffinate in this embodiment consists of the following steps:

[0038] (1) The first step: the feed liquid is collected, and the rare earth raffinate is collected and put into a reaction tank;

[0039] (2) The second step: pretreatment, the rare earth raffinate in (1) is subjected to high-temperature distillation, and the distillation temperature is 1300 degrees Celsius to obtain pure rare earth raffinate;

[0040] (3) The third step: grinding, grinding the NdFeB waste into powder;

[0041] (4) Step 4: Oxidation, the medium-sized NdFeB waste powder in (3) is roasted and oxidized in a rotary kiln, and the roasting and oxidation time is 3 hours.

[0042] (5) The fifth step: mixing, mixing (4) and (2) in a ratio of 2:1;

[0043] (6) The sixth step: pressurizing, pressurizing the mixture of (5) under high pressure for 3 hours; the pressurizing pressure is 3 atmospheres.

[0044] (7) The seventh ste...

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Abstract

The invention discloses a method of extracting rare earth elements in neodymium iron boron waste by employing rare earth extraction raffinate. The distillation temperature in the second step (2) is 1000-1300 DEG C, the roasting oxidization time in the fourth step (4) is 2-4h, and the pressure in the sixth step (6) is 3-5 atmospheric pressure. The method of extracting the rare earth elements in the neodymium iron boron waste by employing the rare earth extraction raffinate has the following beneficial effects: the problems in the prior art that the rare earth elements in the neodymium iron boron waste are not extracted with the rare earth extraction raffinate fully, the time and labor are wasted, resources are wasted, and the environment is polluted are solved, and the method is simple to implement and adapts to various areas.

Description

technical field [0001] The invention relates to the field of a method for leaching rare earth elements, in particular to a method for leaching rare earth elements in NdFeB waste by using rare earth raffinate. Background technique [0002] Due to its superior magnetic properties, NdFeB permanent magnet materials have been widely used in the fields of national defense, aerospace, medical equipment, computers, electronics and new energy automobile industries. China is a major producer of NdFeB, with an output of about 100,000 tons in 2012, and its annual output is still showing a high-speed growth trend. During the production and processing of NdFeB, about 30% of its own weight waste is produced, and the NdFeB permanent magnet contained in the product also enters the environment in the form of waste after the product is scrapped. Rare earth is an important strategic resource. The content of rare earth elements in NdFeB magnets is about 30%, of which neodymium accounts for abou...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/02C22B7/00C22B59/00
CPCC22B1/02C22B7/006C22B59/00Y02P10/20
Inventor 叶亮詹群
Owner XUNWU HENGYUAN TECH DEV CO LTD