Method for recycling sintered neodymium-iron-boron waste materials

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...

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

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