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Ultrafine NdFeB powder recovery method

A recovery method, NdFeB technology, applied in the field of comprehensive utilization of waste resources, can solve the problems of high sealing requirements, many process flows, and high equipment investment costs, and achieve reasonable and reliable composition, high safety and operability, The effect of saving manpower and materials

Active Publication Date: 2016-09-07
CHINALCO JINYUAN RARE EARTH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The traditional recycling method is to completely burn the superfine powder in the air, and then recycle it through the separation of rare earths. It has many procedures, high equipment investment costs, and low recovery rate, and it is impossible to realize the recovery of NdFeB superfine powder. Effective utilization of trace elements, such as B, Cu, Al, Nb, etc.
The recent emerging recycling method is to carry out powder packing, mixing, sieving, pressing, isostatic pressing and other operations on ultrafine powder, especially the use of pressing and isostatic pressing can make the pores in the ultrafine powder disappear and press The density of the billet is increased, but at the same time it is easy to cause elastic-plastic deformation or brittle fracture of the powder particles, and the ultra-fine powder has a high requirement for the sealing of the equipment during the pressing process, and the ultra-fine powder is easy to enter the dead corner and is difficult to clean. The process is very prone to spontaneous combustion. In addition, the anti-oxidation protection operation in this process is difficult, and it is easy to form product impurities or spontaneous combustion of ultra-fine powder, which has great quality problems and potential safety hazards.

Method used

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  • Ultrafine NdFeB powder recovery method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Follow the steps below to recycle NdFeB ultrafine powder:

[0027] (1) Anti-oxidation protection

[0028] Step A: Put a polyvinyl chloride plastic bag with a length, width and thickness of 56cm×32cm×0.008cm on the outlet of the ultrafine powder of the jet mill, keep the bag mouth and the outlet overlapped by about 5-8cm, and tie the plastic bag tightly with a medical tourniquet On the ultra-fine powder outlet, an iron frame platform with a length and width of 30cm×30cm is placed at a vertical distance of 25cm directly below the outlet to support polyvinyl chloride plastic bags;

[0029] Step B: Use a nitrogen gun to fill nitrogen, and repeatedly deoxygenate the plastic bag 3 times, fill the bag with nitrogen again to keep the plastic bag bulging, and slowly open the jet mill ultra-fine powder outlet valve to control the ultra-fine powder falling to the volume of the plastic bag At 1 / 2, close the superfine powder outlet valve and tap the superfine powder outlet with a r...

Embodiment 2

[0040] Follow the steps below to recycle NdFeB ultrafine powder:

[0041] (1) Anti-oxidation protection

[0042] Step A: Put a polyvinyl chloride plastic bag with a length, width and thickness of 56cm×32cm×0.008cm on the outlet of the ultrafine powder of the jet mill, keep the bag mouth and the outlet overlapped by about 5-8cm, and tie the plastic bag tightly with a medical tourniquet On the ultra-fine powder outlet, an iron frame platform with a length and width of 30cm×30cm is placed at a vertical distance of 25cm directly below the outlet to support polyvinyl chloride plastic bags;

[0043] Step B: Fill the plastic bag with argon gas using an argon gas gun, and repeatedly deoxygenate the plastic bag 3 times, fill the plastic bag with argon gas again to keep the plastic bag in a bulging state, and slowly open the jet mill ultra-fine powder outlet valve to control the ultra-fine powder falling to When the volume of the plastic bag is 1 / 2, close the outlet valve of the ultraf...

Embodiment 3

[0054] Example 2

[0055] Follow the steps below to recycle NdFeB ultrafine powder:

[0056] (1) Anti-oxidation protection

[0057] Step A: Put a polyvinyl chloride plastic bag with a length, width and thickness of 56cm×32cm×0.008cm on the outlet of the ultrafine powder of the jet mill, keep the bag mouth and the outlet overlapped by about 5-8cm, and tie the plastic bag tightly with a medical tourniquet On the ultra-fine powder outlet, an iron frame platform with a length and width of 30cm×30cm is placed at a vertical distance of 25cm directly below the outlet to support polyvinyl chloride plastic bags;

[0058] Step B: Fill the plastic bag with argon gas using an argon gas gun, and repeatedly deoxygenate the plastic bag 3 times, fill the plastic bag with argon gas again to keep the plastic bag in a bulging state, and slowly open the jet mill ultra-fine powder outlet valve to control the ultra-fine powder falling to When the volume of the plastic bag is 1 / 2, close the outlet...

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Abstract

The invention belongs to the technical field of comprehensive utilization of waste resources, and particularly relates to an ultrafine NdFeB powder recovery method. The method comprises the following steps: conducting anti-oxidation protection on the ultrafine NdFeB powder, and then transferring the ultrafine NdFeB powder subjected to the anti-oxidation protection to a high-temperature-resistant sintering box; carrying out stage-type heating sintering treatment to achieve 1000-1100 DEG C, and carrying out heat preservation for 1-2 h; and carrying out vacuum self-cooling to achieve material temperature of 880-920 DEG C, and then carrying out inflation air-cooling to reduce the material temperature to 50 DEG C or below, thereby obtaining an ultrafine NdFeB powder alloy. The method provided by the invention is low in cost, simple in technological process, easy to operate and high in recovery rate; microelements are effectively utilized and the resource waste problem is effectively solved; and the ultrafine NdFeB powder alloy recovered according to the method is low in impurity level and reasonable in composition.

Description

technical field [0001] The invention belongs to the technical field of comprehensive utilization of waste resources, and in particular relates to a recovery method of neodymium-iron-boron ultrafine powder. Background technique [0002] NdFeB magnetic material, known as the "Magnetic King" due to its excellent magnetic properties, is widely used in many fields, but in the production process of NdFeB magnets, NdFeB ultrafine powder waste will be generated, and ultrafine The proportion of powder accounts for more than 1% of the output. In order to save resources and improve the comprehensive utilization rate of waste resources, the recycling of NdFeB ultrafine powder has important practical significance and has a broad prospect. [0003] The traditional recycling method is to completely burn the superfine powder in the air, and then recycle it through the separation of rare earths. It has many procedures, high equipment investment costs, and low recovery rate, and it is impossi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F1/00B22F3/10H01F1/057
CPCH01F1/0577B22F3/10B22F1/14
Inventor 李容军黄伟超汤盛龙熊吉磊廖春晓甘家毅
Owner CHINALCO JINYUAN RARE EARTH
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