Treatment method of NdFeB waste

A treatment method and NdFeB technology are applied in the field of NdFeB waste treatment, which can solve the problems of low oxidation efficiency, environmental pollution of hydrochloric acid, and high concentration of hydrochloric acid, and achieve the effects of improving oxidation efficiency and reducing oxidation costs.

Active Publication Date: 2022-04-01
BAOTOU RES INST OF RARE EARTHS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The used hydrochloric acid concentration of above-mentioned method is higher, and the volatilization of hydrochloric acid pollutes environment
In addition, the above method has low oxidation efficiency

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] Mix 100g of NdFeB waste with 25g of solution A (the concentration of hydrochloric acid is 0.5mol / L, and the concentration of ammonium chloride is 1.2mol / L) to obtain a mixture; add 1g of hydrogen peroxide to the mixture and react at 30°C to obtain the first a reactant. The water content of the first reactant was 3 wt%.

[0057] Add 25g solution B (concentration of hydrochloric acid is 0.02mol / L, ammonium chloride concentration is 0.01mol / L) to continue reaction in the first reactant, and form reaction mass; When the water content in the reaction mass is 2wt%, replenish 25g The solution B continues to react; in this way, the solution B is supplemented and reacted until the oxidation rate of iron is greater than or equal to 95%, and the second reactant is obtained.

Embodiment 2

[0059] Mix 100g of NdFeB waste with 25g of solution A (the concentration of hydrochloric acid is 0.8mol / L, and the concentration of ammonium chloride is 1.0mol / L) to obtain a mixture; add 3g of hydrogen peroxide to the mixture and react at 40°C to obtain the first a reactant. The water content of the first reactant was 3 wt%.

[0060] Add 25g solution B (hydrochloric acid concentration is 0.01mol / L, and ammonium chloride concentration is 0.02mol / L) to continue reaction in the first reactant, and form reaction mass; When the water content in the reaction mass is 2wt%, supplement 25g The solution B continues to react; in this way, the solution B is supplemented and reacted until the oxidation rate of iron is greater than or equal to 95%, and the second reactant is obtained.

Embodiment 3

[0062] Mix 1500g of NdFeB waste material with 250g of solution A (the concentration of hydrochloric acid is 0.9mol / L, the concentration of ammonium chloride is 1.2mol / L) to obtain a mixture; add 50g of hydrogen peroxide to the mixture and react at 35°C to obtain the first a reactant. The water content of the first reactant was 2 wt%.

[0063] Add 500g solution B (concentration of hydrochloric acid is 0.03mol / L, ammonium chloride concentration is 0.01mol / L) to continue reaction in the first reactant, and form reaction mass; When the water content in the reaction mass is 2wt%, replenish 500g The solution B continues to react; in this way, the solution B is supplemented and reacted until the oxidation rate of iron is greater than or equal to 95%, and the second reactant is obtained.

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Abstract

The invention discloses a treatment method of NdFeB waste. The treatment method comprises the following steps: (1) mixing NdFeB waste with solution A to obtain a mixture; adding hydrogen peroxide to the mixture, and heating Down reaction, obtain the first reactant; (2) add solution B reaction in the first reactant, obtain the second reactant; Wherein, solution A is the hydrochloric acid solution containing ammonium chloride; Solution B is selected from hydrochloric acid solution, chlorine One or more of ammonium chloride aqueous solution and water. The invention can avoid the use of high-temperature roasting and the generation of a large amount of tail gas.

Description

technical field [0001] The invention relates to a treatment method for NdFeB waste, in particular to a low-temperature treatment method for NdFeB waste. Background technique [0002] In recent years, with the development of wind power generation, new energy vehicles, medical equipment, aviation, military industry and other fields, the demand for NdFeB magnetic materials has been increasing year by year. The use of a large number of NdFeB magnets will also generate a large amount of NdFeB waste. In order to improve the secondary utilization rate of rare earth resources, it is imperative to recover rare earth elements in NdFeB waste. [0003] In the recycling process of NdFeB waste, the pyrotechnic process is more friendly to the environment, but the processing capacity is small, the recovery rate is low, the energy consumption is high, and the recovery cost is high. At present, most of the recycling processes used are oxidation roasting-acid dissolution-precipitation-based ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B7/00C22B59/00
CPCC22B7/006C22B59/00Y02P10/20
Inventor 赵永志马莹帅国胜候少春笪宗扬李二斗丁艳蓉张文娟宋静赵拓王晶晶
Owner BAOTOU RES INST OF RARE EARTHS
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