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Method for recovering, smelting and reusing base material in jet mill procedure for sintered NdFeB production

A jet mill and NdFeB technology, applied in the direction of improving process efficiency, can solve the problem that the bottom material cannot be processed and reused, and achieve the effect of shortening the recycling cycle, simple process, and the same product performance

Inactive Publication Date: 2010-10-27
山西金山磁材有限公司
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  • Description
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  • Application Information

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Problems solved by technology

[0004] In order to solve the problem that the bottom material produced in the jet mill process in the sintered NdFeB process cannot be processed and reused, this method proposes a method for recycling, smelting and reusing the bottom material in the jet mill process of sintered NdFeB production

Method used

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  • Method for recovering, smelting and reusing base material in jet mill procedure for sintered NdFeB production
  • Method for recovering, smelting and reusing base material in jet mill procedure for sintered NdFeB production

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Embodiment 1

[0018] Embodiment 1. A method for recycling, smelting and reusing bottom material in jet milling process by sintering NdFeB, comprising the following steps:

[0019] (1) The collection and airtight storage of jet mill bottom material:

[0020] Centrally store the hard-to-break bottom material produced by the jet mill process, and store it in a sealed nitrogen-filled environment to prevent the increase in oxygen content during storage. In order to prevent the oxidation of the powder, the sealed tank is filled with nitrogen for protection; generally, when the oxygen content of the powder is ≤5000ppm, this method is suitable for addition and utilization (the base material can be stored within 10 days under the condition of filling nitrogen).

[0021] (2). Add the collected air-jet grinding bottom material to the normal material at a ratio of 10% during the ingot batching and smelting together. The adding method: select a roll-shaped industrial 0.1mm thick plain aluminum foil and ...

Embodiment 2

[0026] Embodiment 2, a method for recovering, smelting and reusing the base material in the jet mill process of sintering NdFeB production, comprising the following steps: collecting and sealing the jet mill base material:

[0027] Add 0.15% (weight ratio) of Pr-Nd alloy ingredients according to the designed 35H grade formula, select the plain aluminum foil with a thickness of 0.2mm in the roll industry, cut it into aluminum foil paper with a size of 300×300mm, and wrap the base material with 5% of the raw material weight Covering, the insufficient part of the metal Al is made up with the cut aluminum plate; after it is prepared, it is smelted together, and the subsequent process is the same as the normal sintered NdFeB production process: powder making, molding, sintering, tempering, and testing of magnetic properties. From the results in Table 2, it can be seen that the performance indicators of the magnets added with the primer are basically the same as those of the magnets ...

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Abstract

The invention relates to a processing technology of a base material generated in a sintered NdFeB production process, in particular to a method for recovering, smelting and reusing a base material in a jet mill procedure for sintered NdFeB production, which solves the problem of the prior art that the base material generated in the jet mill procedure in the sintered NdFeB production process can not be processed. The method comprises the following steps: collecting, sealing and storing the base material from a jet mill; adding the collected base material from the jet mill to normal materials according to a certain ratio in the process of steel ingot batching, and then smelting the mixture to obtain steel ingot; crushing and shaping in a static pressure manner; and finally tempering and sintering. The processing method of the invention breaks through the traditional thinking of the existing processing method, and turns the existing traditional processing mode of recovering the directly scraped powder by a rare earth manufacturer and then purifying the rare earth material in the recovered powder by a chemical method into the mode of directly utilizing the powder.

Description

technical field [0001] The invention relates to a processing technology for bottom material produced in the production process of sintered NdFeB, in particular to a method for recovering, smelting and reusing the bottom material in the jet milling process of sintered NdFeB production. Background technique [0002] As an important functional material, sintered NdFeB has developed rapidly in recent years, but with the rapid development of sintered NdFeB, the raw materials used in the production of NdFeB, especially the use of rare earth materials are also increasing. The astonishing rate of increase, although my country's rare earth resource reserves account for about 55% of the world's total reserves, is worthy of the name of a large country of rare earth resources, but if we do not consider the recycling and effective utilization of raw materials, we will still face serious consequences of resource scarcity. [0003] In the production process of sintered NdFeB, jet milling is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C33/04C22B1/245
CPCY02P10/20
Inventor 刘吉祥王瑜
Owner 山西金山磁材有限公司
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