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Nd-Fe-B waste solution electrolysis regeneration method

A technology of electrolytic regeneration and neodymium iron boron, which is applied in construction waste recycling, photographic technology, instruments, etc., can solve the problem of low iron utilization efficiency and achieve the effect of high value-added utilization

Active Publication Date: 2020-05-15
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0016] It can be seen that the existing NdFeB wet recovery technology has a low utilization efficiency of iron, and can only produce iron products with low value, or even only remove iron
[0017] In summary, the existing technology can recover rare earth elements in NdFeB waste by means of high temperature, high pressure, strong acid, etc., but there are still gaps in the grade of rare earth products, the separation of rare earth elements, and the high value-added utilization of iron elements. room for improvement

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0032] Refrigerator door magnetic strip debris, the main components (multiple test range values) are: TFe 61.62% ~ 63.12%, Nd 21.31% ~ 22.97%, Pr 3.03% ~ 3.86%, La 1.39% ~ 1.72%, B 9.16% ~10.03%; as FeSO 4 ·7H 2 O Prepare a solution with a concentration of 0.98mol / L-1.03mol / L as the electrolytic solution; the electrolysis temperature is room temperature (12°C-27°C); the anode of the electrolytic cell is the refrigerator door magnetic strip debris, and the cathode is a high-purity iron plate; the electrolysis pH is 2.5 ~3.62, current density 20mA / cm 2 ~200mA / cm 2 (initial to final process value).

[0033] Use process:

[0034] (1) Electrodes. Weigh 500g of NdFeB waste material, and place the debris in the anode basket after being gathered by the magnetism of the waste material; clean the surface of the high-purity iron plate; place the anode basket and the cathode plate in the electrolyte;

[0035] (2) Electrolyte. FeSO 4 ·7H 2 O was prepared into 3L of electrolyte sol...

example 2

[0039] Disassemble the magnetic block of the motor, the main components (multiple test range values) are: TFe 61.73% ~ 63.09%, Nd 21.47% ~ 22.85%, Pr 3.14% ~ 3.89%, La 1.34% ~ 1.68%, B 9.22% ~ 10.01%; as FeSO 4 ·7H 2 O Prepare a solution with a concentration of 0.99mol / L-1.05mol / L as the electrolytic solution; the electrolysis temperature is room temperature (12°C-27°C); the anode of the electrolytic cell is a disassembled magnet block of the motor, and the cathode is a high-purity titanium plate; the electrolysis pH is 2 .5~3.62, current density 20mA / cm 2 ~500mA / cm 2 (initial to final process value).

[0040] Use process:

[0041] (1) Electrodes. Weigh 512g of NdFeB waste material, connect the anode of the power supply after the two magnetic blocks are assembled by means of waste magnetism; clean the surface of the high-purity titanium plate; place the anode magnetic block and the cathode plate in the electrolyte;

[0042] (2) Electrolyte. FeSO 4 ·7H 2 O was prepared...

example 3

[0046] Zero miscellaneous waste NdFeB permanent magnet debris, the main components are: TFe 62.87% ~ 62.95%, Nd 22.39% ~ 22.57%, Pr 3.26% ~ 2.31, La 1.42% ~ 1.59%, B 9.45 ~ 9.46%; FeSO 4 ·7H 2 O to prepare FeSO with a concentration of 1.51mol / L~1.53mol / L 4 The solution is used as the electrolytic solution; the electrolysis temperature is room temperature (15°C-28°C); the anode of the electrolytic cell is a waste NdFeB magnet, and the cathode is a high-purity titanium plate; the electrolysis pH is 2.5-3.62, and the current density is 20mA / cm 2 ~200mA / cm 2 (initial to final process value).

[0047] Use process:

[0048] (1) Raw material (anode material) preparation. Cut and obtain 3g ~ 5g NdFeB magnetic block, grind it with a grinder to remove the pollutants on the surface of the magnetic block to expose the fresh surface, weigh and record its weight;

[0049] (2) Cathode material preparation. Take a small piece of pure iron sheet, cut it regularly, wipe off the surface i...

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Abstract

The invention belongs to the field of renewable resources and particularly relates to a Nd-Fe-B waste solution electrolysis regeneration method. The Nd-Fe-B waste solution electrolysis regeneration method comprises the steps of firstly, removing an anticorrosive layer on the surface of a Nd-Fe-B dismantled waste material; gathering the waste materials into a whole through the Nd-Fe-B magnetism toserve as an anode of an electrolysis system, wherein in the electrolytic process, the anode is dissolved, rare earth and iron ions go into a solution, the iron ions are separated out at a cathode to become high-purity iron, and the rare earth is enriched in electrolyte in an ionic state; and recycling rare earth elements in the electrolyte in a solvent extraction mode after completion of electrolysis and producing rare earth oxides or further producing rare earth metals. Through the Nd-Fe-B waste solution electrolysis regeneration method, a high-purity electrolytic iron product can be directlyrecycled in the electrolytic process, Nd, La, Dy and other rare earth ions left in the electrolyte are separated through extraction, the technological process has the requirement for the temperatureand can be implemented at normal temperature, and the high value-added utilization of iron and rare earth is realized.

Description

technical field [0001] The invention belongs to the field of renewable resources and relates to a method for electrolytic regeneration of NdFeB waste solution. Background technique [0002] Rare earth is a valuable and key strategic resource, which plays a vital role in various fields of industry, military and life. With the increasing demand for high-performance magnetic materials in various countries, more and more rare earths are used to produce rare earth permanent magnet materials represented by NdFeB permanent magnets. The rare earth content in NdFeB permanent magnet waste is about 30%, which is much higher than that in raw ore, and the potential regeneration value is high. If it can be recycled effectively, it will have a positive effect on the entire industrial chain. To realize the recycling of rare earth elements, it is urgent to develop regeneration technology for waste NdFeB. The present invention can directly extract and separate the rare earth elements in th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B59/00C25C1/06C25C1/22
CPCC22B7/006C22B59/00C25C1/06C25C1/22Y02P10/20Y02W30/58
Inventor 胡文韬汪东芳刘欣伟
Owner UNIV OF SCI & TECH BEIJING
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