Method for recycling sintered neodymium-iron-boron waste

A NdFeB recycling technology, applied in chemical instruments and methods, grain processing, transportation and packaging, etc., can solve the problems of inability to increase the proportion of waste recycling, product sample oxidation, low oxygen content and other problems, and reduce inventory costs , Improve the recycling rate, improve the effect of recycling rate

Active Publication Date: 2019-11-22
山东上达稀土材料有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Sintered NdFeB magnets will inevitably produce unqualified products or processing residues during the production and processing of blanks. These unqualified products or processing residues can only be reprocessed as waste products, resulting in waste of materials and increased costs; and At present, in the industry, these NdFeB substandard products or processing leftovers are cleaned u

Method used

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  • Method for recycling sintered neodymium-iron-boron waste
  • Method for recycling sintered neodymium-iron-boron waste

Examples

Experimental program
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Effect test

Embodiment 1

[0038] A method for recycling sintered NdFeB waste, comprising the steps of:

[0039]Step 1, waste classification: classify different grades of NdFeB waste, and store each kind of NdFeB waste with similar composition separately for future use;

[0040] Step 2, surface dezincification: Put the NdFeB waste materials of 33SH to 42SH classified in step 1 into the pickling tank, and wash the NdFeB waste materials by pickling method. The pickling method adopts a concentration of 5 % hydrochloric acid solution is used as pickling solution to remove the galvanized layer on the surface of the NdFeB waste material to obtain non-coated NdFeB waste material;

[0041] Step 3, degreasing the surface: put the NdFeB waste obtained in Step 2 into the degreasing tank, and wash the NdFeB waste by alkaline washing method, which uses hot lye with a temperature of 65°C as the alkaline wash liquid to remove the oil and impurities on the surface of the NdFeB waste, and then use a high-pressure water...

Embodiment 2

[0051] A method for recycling sintered NdFeB waste. The difference between this embodiment and Embodiment 1 is that in step 2, the mixed waste of N33-N42 is selected for pickling processing; in step 5, 2% of the total weight of waste particles is added. A single piece of praseodymium neodymium alloy with a size of 18 mm is mixed and hydrogen crushed as a rare earth metal block, and the dehydrogenation temperature is 560 ° C; after the jet mill in step 6, the particle size of the obtained fine powder is 4.3; the sintering temperature in step 7 is 1060°C, and the holding time is 5 hours; during the aging treatment in step 8, hold the heat at 900°C for 2 hours at the first aging, and hold at 480°C for 5 hours at the second aging.

[0052] After testing, the properties of N33-N42 NdFeB waste materials are as follows:

[0053] Br Hcb Hcj BHmax Hk HK / Hcj density 12.7 12.26 16.05 38.88 15.24 0.95 7.552 12.86 12.33 15.98 39.67 15.1 0.95 7.546 ...

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Abstract

The invention discloses a method for recycling sintered neodymium-iron-boron waste. The method includes the following steps of 1, waste classifying; 2, surface zinc removing; 3, surface oil removing;4, waste breaking; 5, hydrogen breaking; 6, airflow mill powder grinding; 7, briquetting sintering; and 8, aging treatment. According to the method for recycling the sintered neodymium-iron-boron waste, the use ratio of the waste can be effectively increased, consumption of the waste is accelerated, the inventory cost is reduced, the product quality is guaranteed, neodymium-iron-boron magnets withdifferent properties can be prepared effectively by adjusting the ratios and varieties of rare earth metal blocks, the application range of the waste is widened, a sealing plate can be effectively pushed through granular materials injected into a mixing device to rotate to inject an antioxidant and a lubricant quantitatively, thus, the processed particles are fully wrapped by the antioxidant andthe lubricant effectively, the granular materials are prevented from being oxidized during following machining, and the influences on the performance after the waste is recycled are reduced.

Description

technical field [0001] The invention relates to the technical field of utilization of rare earth materials, in particular to a method for reusing sintered NdFeB waste. Background technique [0002] NdFeB permanent magnet material is a permanent magnet material based on intermetallic compound ND2FE14B, and sintered NdFeB is a kind of NdFeB permanent magnet material. Because of its excellent magnetic properties, it is widely used in electronics, electric power Machinery, medical equipment, toys, packaging, hardware machinery, aerospace and other fields. [0003] Sintered NdFeB magnets will inevitably produce unqualified products or processing residues during the production and processing of blanks. These unqualified products or processing residues can only be reprocessed as waste products, resulting in waste of materials and increased costs; and At present, in the industry, these NdFeB substandard products or processing leftovers are cleaned up and then remelted or hydrogen p...

Claims

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Application Information

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IPC IPC(8): B22F9/04B22F9/02C23G1/08C23G1/19B22F3/04B22F3/10B22F3/24C22C38/00B22F1/02B02C23/08B03C1/30B01F13/00
CPCB22F9/04B22F9/023C23G1/08C23G1/19B22F3/04B22F3/10B22F3/24C22C38/005C22C38/002B02C23/08B03C1/30B22F2003/248B22F1/16B01F33/27
Inventor 周书台徐凯金亮
Owner 山东上达稀土材料有限公司
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