Method for recycling sintered neodymium-iron-boron waste materials

A technology of waste recycling and neodymium iron boron, which is applied in the direction of recycling technology, can solve the problems of many production processes, low recovery rate and high cost, and achieve the effect of simple process, resource saving and high recovery rate

Active Publication Date: 2014-12-10
SINO MAGNETICS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Using the method of purification and separation, although the rare earth elements in the NdFeB waste can be reused, the process is relatively complicated and the cost is high, and after the rare earth is purified, the purification of other elements is not high, so it is difficult to carry out Reuse
2) The second vacuum smelting method is adopted. Firstly, the waste material is first vacuum smelted together with an appropriate amount of aluminum to make an alloy steel ingot. NdFeB magnetic material is made by sintering, but its production process is complex, requiring two smelting, high production cost and low recovery rate
The waste treatment of this method needs to be cleaned with nitric acid, hydrochloric acid, sulfuric acid and other substances, so harmful substances waste acid water will be produced in the production process; and the waste needs to be prepared separately and in a specific proportion with rare earth-rich and iron-rich alloy powder Mixing and reprocessing molding, many production processes and high cost

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] 1) Classify the unqualified NdFeB waste generated in the production process and the leftovers generated by post-processing according to the performance grades, collect and store the NdFeB wastes with the performance grade 40H.

[0034] 2) Each time, put 80kg of NdFeB waste with performance grade 40H and 60kg of white corundum abrasive with a specification of 25x25 into the vibrating finishing machine each time, and then add FX-1 metal cleaning agent with a mass concentration of 2%. 5L, turn on the faucet after turning on the vibrator for 30 minutes, adjust the water volume to 400ml / min, continue to vibrate for 2 hours and then take out the waste.

[0035] 3) Take 15kg of the above-mentioned waste materials that have been treated by vibration and finishing each time and put them into the cleaning drum, place them in the YQ-1004 ultrasonic cleaning tank with a capacity of 80L in the washing machine, start cleaning, and the cleaning drum rotates at a speed of 10 rpm. Rotat...

Embodiment 2

[0043] 1) Classify the unqualified NdFeB waste generated in the production process and the leftovers generated by post-processing according to the performance grades, collect and store the NdFeB wastes with the performance grade 38SH.

[0044] 2) Each time, put 90kg of NdFeB scrap with performance grade of 38SH and 65kg of white corundum abrasive with specification of 25x25 into the vibrating finishing machine each time, and then add FX-1 metal cleaning agent with a mass concentration of 4%. 10L, turn on the faucet after turning on the vibrator for 30 minutes, adjust the water volume to 400ml / min, continue to vibrate for 3 hours and then take out the waste.

[0045] 3) Take 25kg of waste materials that have been treated by the above-mentioned vibratory finishing treatment and put them into the cleaning drum, place them in the YQ-1004 ultrasonic cleaning tank of the washing machine, start the cleaning, and the speed of the cleaning drum is 10 rpm. Rotate in the cleaning tank, t...

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Abstract

The invention discloses a method for recycling sintered neodymium-iron-boron waste materials. The method is characterized by including the following steps that the neodymium-iron-boron waste materials are classified and collected according to performance trade marks; the classified and collected waste materials and abrasive materials are mixed and then placed in a vibration polisher machine, and a cleaning agent is added for vibration finishing cleaning; the waste materials obtained after vibration finishing cleaning are ultrasonically cleaned and dried for standby; according to the standard identical to the performance trade marks of the waste materials obtained through the steps, alloy cast slices are prepared through batching, smelting and casting; the cleaned waste materials and the prepared alloy cast slices with the same trade marks are mixed, and hydrogen decrepitation processing is conducted on the mixture; the materials obtained after hydrogen decrepitation processing are ground into powder, pressed, formed, and sintered into a neodymium-iron-boron magnet. According to the method, no harmful matter is generated in the production process, the production process is environmentally friendly and free of pollution, resources can be effectively saved, the recovery rate is high, cost is reduced, and procedures are simple, easy and convenient to implement and feasible.

Description

technical field [0001] The invention relates to a method for recycling sintered NdFeB waste, in particular to a method for directly obtaining NdFeB magnets of the same grade as the sintered NdFeB waste. Background technique [0002] NdFeB products have developed rapidly in recent years due to their excellent performance. However, due to the large amount of leftover materials produced in the machining process and the existence of substandard products in the production process, resources are wasted. If they cannot be properly utilized, the production cost of the enterprise will inevitably increase. [0003] At present, the recycling methods for sintered NdFeB wastes include: 1) Using the technology of purification and separation of magnets to obtain elemental elements with high purity, such as praseodymium and neodymium. Using the method of purification and separation, although the rare earth elements in the NdFeB waste can be reused, the process is relatively complicated and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F8/00
CPCY02W30/50
Inventor 杨时康黄首谚孙斌
Owner SINO MAGNETICS TECH
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