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Method for preparing regenerated neodymium-iron-boron magnet from sintered neodymium-iron-boron slag

A neodymium-iron-boron and slag technology, which is used in the manufacture of magnetic objects, inductors/transformers/magnets, magnetic materials, etc., can solve the problems of cumbersome process, high manufacturing cost, environmental pollution, etc., and achieves simple process, low manufacturing cost, short process effect

Pending Publication Date: 2020-11-13
宁波源盛磁业有限公司
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Problems solved by technology

However, the above process is cumbersome, the process is long, the manufacturing cost is high, and a large amount of waste acid and waste liquid is produced, polluting the environment

Method used

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  • Method for preparing regenerated neodymium-iron-boron magnet from sintered neodymium-iron-boron slag

Examples

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Embodiment 1

[0018] A method for preparing NdFeB by regeneration of sintered NdFeB slag, the preparation method comprising the following steps:

[0019] (1) Anti-oxidation treatment of slag: Cool the slag with argon gas when opening the smelting furnace door, so that the slag is cooled to below 60°C, and immediately put the slag into a sealed bucket and fill it with nitrogen for protection.

[0020] (2) Slag remelting: quickly put the nitrogen-protected slag into the vacuum plasma furnace, close the furnace body, evacuate to below 5Pa, and then fill it with argon to -0.05MPa; start the plasma arc and induction heating power supply to the slag Carry out heating and remelting, the heating rate is 20°C / s, and the remelting temperature is 1600°C. After the slag is melted, it is stirred to make the harmful substances in the slag float up, and after the slag no longer floats up, it is refined for 4 minutes to cast the slag alloy ingot.

[0021] (3) Proportioning raw materials: The composition a...

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Abstract

The invention relates to a method for preparing a regenerated neodymium-iron-boron magnet from sintered neodymium-iron-boron slag, and belongs to the field of rare earth permanent magnet materials. Inthe process of preparing the neodymium iron boron by regenerating the sintered neodymium iron boron slag, the waste neodymium iron boron slag is smelted by a vacuum plasma induction furnace, and thesintered neodymium iron boron magnet with extremely high cost performance is obtained by a formula design and a sintering process. In the preparation process, slag is protected by inert gas after being discharged from the furnace, so that slag oxidation is avoided; the furnace slag is rapidly and completely dissolved through the extremely high temperature of the vacuum plasma induction furnace, and impurities can be removed more effectively; and the method is simple in process, short in flow and low in manufacturing cost, does not produce a large amount of waste acid and waste liquid, plays acertain positive role in environmental protection, and follows the sustainable development principle.

Description

[0001] field of invention [0002] The invention relates to a method for preparing a regenerated NdFeB magnet by using sintered NdFeB slag, belonging to the field of rare earth permanent magnet materials. Background technique [0003] Sintered neodymium iron boron (NdFeB) is currently the most magnetic rare earth permanent magnet material, it has a high magnetic energy product, good coercive force and high temperature resistance. Products are widely used in electric vehicles, wind power generation, inverter air conditioners, nuclear magnetic resonance, CD drives, instruments, mineral processing, toys and other fields. The wide range of applications brings about a rapid increase in annual output, but in the production process of sintered NdFeB magnets, about 30% of the total weight of raw materials will be produced NdFeB waste, including slag from smelting and ultrafine powder from jet milling , Cutting waste and sludge waste, etc. With the development of global environmental...

Claims

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Application Information

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IPC IPC(8): H01F1/057H01F41/02
CPCH01F1/0577H01F41/0253
Inventor 凌聪褚留顺江燕进
Owner 宁波源盛磁业有限公司
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