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Regeneration method of rare earth permanent magnet material

A technology of rare earth permanent magnets and recycled materials, which is applied in the direction of magnetic materials, magnetic objects, and improvement of process efficiency. Simple, low-addition effect

Inactive Publication Date: 2003-04-30
北京磁源科技有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main disadvantage of this method is: since these scraps and scraps are sintered bodies, they have high hardness and are difficult to break. 2 Mechanical pulverization in gas has low efficiency, high energy consumption, and large loss of R-rich phases; in addition, waste is not classified, and new powder must be added to any scraps and waste after testing. The test workload is large, and the new powder A large amount is added, which increases the cost

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] take SmCo 5 The non-oxidizing recycled material removes impurities, cleans, removes oil, and dries. The above-mentioned dried raw materials were placed in a device for hydrogen treatment, vacuumed to below 1 Pa, and then fed with hydrogen to 0.1 MPa, and kept for 30 minutes to obtain coarse powder with an average particle size of less than 2 mm. This coarse powder is ground into a fine powder of about 5 microns by an air mill, and then the pressure is 2 tons / cm 2 , Under the condition of magnetic field strength of 15kOe, pressure forming is carried out to make a blank. The blank was sintered under argon at a sintering temperature of 1125°C, kept for 2 hours, cooled to 900°C at a rate of 0.7°C / min, held for 1 hour, and cooled to room temperature at a rate of 60°C / min. measured B r =9.6kGs, iH c = 26.7kOe, (BH) max =21.8MGOe.

Embodiment 2

[0019] will Nd 15 Fe 76.5 Al 0.5 B 8 The non-oxidized lower leftover scraps and wastes are removed sundries, washed, degreasing, and dried. The above-mentioned dried raw materials were placed in a device for hydrogen treatment, vacuumed to below 10 Pa, and then fed with hydrogen to 0.1 MPa, and kept for 20 minutes to obtain coarse powder with an average particle size of less than 2 mm. The coarse powder was ground into a fine powder of about 5 microns by jet mill, and then the fine powder was mixed with 3% of Nd-rich alloy powder whose nominal composition was Nd: 44wt%, Fe: 55wt%, B: 1wt%. This mixed fine powder is at a pressure of 2 tons / cm 2 , pressure forming under the condition of magnetic field strength 20kOe, and then press molding at 2 tons / cm 2 Cold isostatic pressing is carried out under conditions to make a blank. The blank is sintered in a vacuum state, the sintering temperature is 1080°C, the temperature is kept for 3 hours, the temperature is lowered to 900°...

Embodiment 3

[0021] will Nd 1.5 Fe 76.5 Al 0.5 B 8 Removal of debris, cleaning, degreasing and drying of the shavings and wastes containing oxidized materials. The above-mentioned dried raw materials were placed in a device for hydrogen treatment, vacuumed to below 1 Pa, and then fed with hydrogen to 1.0 MPa, and kept for 40 minutes to obtain coarse powder with an average particle size of less than 2 mm. The coarse powder was jet milled to a fine powder of about 5 microns. This fine powder was then mixed with 20% of Nd-rich alloy powder with the nominal composition of Nd: 44wt%, Fe: 55wt%, B: 1wt%. This mixed powder is at a pressure of 2 tons / cm 2 , pressure forming under the condition of magnetic field strength 20kOe, and then press molding at 2 tons / cm 2 Cold isostatic pressing is carried out under the conditions to make a blank. The blank was sintered under vacuum, the sintering temperature was 1110°C, the temperature was kept for 3 hours, the temperature was lowered to 900°C at ...

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Abstract

A process for regenerating the leftover of permanent-magnet RE alloy includes such steps as removing impurities, washing, drying, treating in H2 gas, breaking, fine grinding, adding R-enriched alloy powder, die pressing in magnetic field ,vacuum sintering in protecting atmosphere, and heat treating. Its advantages are high efficiency and magnetic property, and low cost.

Description

technical field [0001] The invention relates to a method for regenerating rare earth permanent magnet materials, belonging to the technical field of magnetic materials. Background technique [0002] Rare earth cobalt permanent magnet (RCo 5 , R 2 Co 17 and R 2 Fe 14 The emergence of type B) has greatly improved the performance and application range of permanent magnet materials. At the same time, in the process of sintering, processing, and assembly of rare earth permanent magnets, about 10% of waste products and scraps will be generated, which affects the utilization rate of rare earth metals and reduces the economic benefits of enterprises. In order to reduce the cost of magnets, some people have invented some technologies for regenerating rare earth permanent magnet waste and scraps, mainly including hydrometallurgy process (see CN1174104A), dry metallurgy technology (see CN1127797A), Ca reduction technology (see CN1272946A). The main disadvantages of the hydrometal...

Claims

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Application Information

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IPC IPC(8): B22F9/04C22B7/00H01F1/053
CPCY02P10/20
Inventor 姜忠良陈秀云刘海晨闵章宋沛文朱静
Owner 北京磁源科技有限公司
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