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Method for recycling rare earth from NdFeB waste

A technology of NdFeB and waste materials, which is applied in the field of recycling industrial waste resources, can solve the problems of incomplete pickling and oxidation of NdFeB, high energy consumption, impure recovery of rare earth metals, etc., and achieves convenient and cheap sources, and process flow Simple, low-cost effect

Inactive Publication Date: 2017-01-11
XUNWU HENGYUAN TECH DEV CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to overcome the shortcomings of high energy consumption in traditional rare earth recovery, incomplete acid leaching and oxidation of NdFeB, and impure recovery of rare earth metals, the technical problem to be solved by the present invention is to provide a method of dissolving NdFeB waste using a certain proportion of mixed acid , first use N503 to extract iron ions in the extract solution, and then use P507 high-purity extraction to recover rare earth metal ions

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] a. Throw 120Kg of NdFeB waste into the filter press for pressure filtration, control the water content at 5%, the main components of the filtrate are water and a small amount of soluble salts, after the completion of the pressure filtration, take out the filter cake and place it in a hot air drying furnace Drying, the drying temperature is 120, the quality after drying is 105.6Kg.

[0031] b. Throw the dried filter cake into the NdFeB hydrogen crushing device, first pass argon gas to remove the oxygen in the device to prevent hydrogen explosion, and then pass in hydrogen gas, the flow rate of hydrogen gas is 50m 3 / h, in the case of incomplete dehydrogenation, the filter cake will be broken and become a fine powder. The operating temperature of hydrogen absorption is 25°C for 1h. Crushed and decomposed into fine powder. After the hydrogen absorption and crushing are completed, the vacuum pump is turned on for dehydrogenation, so that the vacuum degree is at 0.1Pa.

[...

Embodiment 2

[0042] a. Throw 120Kg of NdFeB waste into the filter press for pressure filtration, control the water content at 10%, the main components of the filtrate are water and trace soluble salts, after the completion of the pressure filtration, take out the filter cake and place it in a hot air drying furnace Drying, the drying temperature is 180°C, and the mass after drying is 102.5Kg.

[0043] b. Throw the dried filter cake into the NdFeB hydrogen crushing device, first pass argon gas to remove the oxygen in the device to prevent hydrogen explosion, and then pass in hydrogen gas, and the flow rate of hydrogen gas is 100m 3 / h, in the case of incomplete dehydrogenation, the filter cake will be broken and become a fine powder. Crushed and decomposed into fine powder. After the hydrogen absorption and crushing are completed, the vacuum pump is turned on for dehydrogenation, so that the vacuum degree is at 0.5Pa.

[0044] c. Transfer the hydrogen-absorbing and crushed fine powder to ...

Embodiment 3

[0054] a. Throw 120Kg of NdFeB waste into the filter press for pressure filtration, control the water content at 8%, the main components of the filtrate are water and trace soluble salts, after the completion of the pressure filtration, take out the filter cake and place it in a hot air drying furnace Drying, drying temperature is 160 ℃. The mass after drying was 113.5Kg.

[0055] b. Throw the dried filter cake into the NdFeB hydrogen crushing device, first pass argon gas to remove the oxygen in the device to prevent hydrogen explosion, and then pass in hydrogen gas, and the flow rate of hydrogen gas is 80m 3 / h, in the case of incomplete dehydrogenation, the filter cake will be broken and become fine powder. It breaks down into a fine powder. After the hydrogen absorption and crushing are completed, the vacuum pump is turned on for dehydrogenation, so that the vacuum degree is at 0.3Pa.

[0056] c. Transfer the hydrogen-absorbing and crushed fine powder to a roasting furna...

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Abstract

The invention discloses a method for recycling rare earth from NdFeB waste. The method is mainly characterized in that by utilization of oxidability and faint acid performance of hydrogen peroxide, a certain proportion of mixed acid is used for dissolving the NdFeB waste, the NdFeB waste is crushed through an NdFeB hydrogen crushing device, and after acid leaching is finished, N503 is used for extracting the iron element in a leaching agent; and then P507 is used for extracting the single rare earth metal ions, corresponding rare earth metal ions are deposited through oxalic acid and potassium carbonate, and the rare earth metal is further purified. Through scientific purifying design, the defects that in traditional rare earth recycling, energy consumption is high, and acid leaching of oxidation NdFeB is not thorough are overcome; and in the pretreatment process, grinding is not needed, a large amount of dust is prevented from being generated, energy saving and environment friendliness are achieved, and the NdFeB more thoroughly forms the rare earth metal ion through a mixed acid acid leaching method.

Description

technical field [0001] The invention belongs to the technical field of recycling industrial waste resources, and in particular relates to a method for recovering rare earths from neodymium-iron-boron waste. Background technique [0002] NdFeB is favored by industrial production because of its superior magnetic properties, but a large amount of NdFeB waste is inevitably produced in the industrial production process, and unfavorable recycling of NdFeB waste will generate a large number of pollution sources. Wasteful and not environmentally friendly. In addition to a large amount of Fe and B, these waste materials also contain a large part of rare elements Nd and Pr. Rare earth elements can be widely used in catalytic materials, alloy devices, luminescent materials, etc. Therefore, the recovery of rare earth elements from NdFeB waste can not only alleviate the crisis of rare earth resources, but also play an important role in promoting resource recycling. There are fewer comp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B59/00C22B7/00
CPCC22B7/007C22B59/00Y02P10/20
Inventor 叶亮
Owner XUNWU HENGYUAN TECH DEV CO LTD
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