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 hi

Method used

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

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[0017] Example 1:

[0018] A method for preparing NdFeB by regeneration of sintered NdFeB furnace slag. The preparation method includes the following steps:

[0019] (1) Slag anti-oxidation treatment: When the door of the melting furnace is opened, the slag is cooled with argon gas to cool the slag to below 60°C, and immediately after being discharged, the slag is placed in a sealed drum and filled with nitrogen for protection.

[0020] (2) Slag remelting: quickly load nitrogen-protected slag into a vacuum plasma furnace. After sealing the furnace body, vacuumize to below 5Pa, and then fill with argon gas to -0.05MPa; start plasma arc and induction heating power to treat the slag Perform heating and remelting with a heating rate of 20°C / s and a remelting temperature of 1600°C. After the slag is melted, stirring makes the harmful substances in the slag float up, and after the slag no longer floats, it is refined for 4 minutes to cast the slag alloy ingot.

[0021] (3) Proportioning ra...

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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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