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A short process method for preparing high-performance sintered NdFeB magnets from sintered NdFeB sludge waste

A high-performance NdFeB technology, which is applied in the fields of magnetic objects, recycling technology, inductance/transformer/magnet manufacturing, etc., can solve the problems that cannot be applied, and the magnetic powder has no magnetic properties, so as to facilitate subsequent processing and avoid secondary Waste and reduce the effect of milling energy consumption

Active Publication Date: 2016-11-09
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this method can be used to obtain sintered NdFeB magnetic powder from NdFeB oil sludge, the obtained magnetic powder has no magnetic properties and cannot be used in practice.

Method used

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  • A short process method for preparing high-performance sintered NdFeB magnets from sintered NdFeB sludge waste
  • A short process method for preparing high-performance sintered NdFeB magnets from sintered NdFeB sludge waste
  • A short process method for preparing high-performance sintered NdFeB magnets from sintered NdFeB sludge waste

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021]Put 30ml of NdFeB sludge waste into a flask, add 450ml of distilled water, and use a rotary evaporator to carry out water bath distillation. Under vacuum conditions, the temperature is raised stepwise, starting from 30°C, and the temperature is raised by 5°C every 5 minutes until it reaches 80°C. After the internal liquid was evaporated to dryness, the operation was repeated 3 times to obtain 26.42 g of distilled powder. Add 52ml of acetone to the distilled powder, ultrasonically clean 3 times, then add absolute ethanol, ultrasonically clean 2 times, each ultrasonic time is 10min, after removing the lotion, dry it under vacuum at 50°C to obtain the pretreated powder; test XRD (such as figure 1 Shown), XRF (as shown in Table 1). Depend on figure 1 It can be seen that the powder after pretreatment is mainly Fe 3 o 4 , Nd(CO 3 )(OH) 4 ·xH 2 O, Fe 2 Nd and Fe 2 b. The XRF results are shown in Table 1.

[0022] According to the element content in Table 1 and accord...

Embodiment 2

[0024] Put 30ml of NdFeB sludge waste into a flask, add 450ml of distilled water, and use a rotary evaporator to carry out water bath distillation. Under vacuum conditions, the temperature is raised stepwise, starting from 30°C, and increasing the temperature by 5°C every 8 minutes until 80°C. After the internal liquid was evaporated to dryness, the operation was repeated twice to obtain 25.64 g of distilled powder. Add 51ml of acetone to the distilled powder, ultrasonically clean it 3 times, then add absolute ethanol, and ultrasonically clean it once under a magnetic field, and the ultrasonic time is 12min each time. After removing the lotion, dry it under vacuum at 50°C to obtain Powder after pretreatment; test XRF, the results are shown in Table 2.

[0025] According to the element content in Table 2 and RE 2 Fe 14 B stoichiometric ratio, adding Nd before reaction 2 o 3 Make the total amount of rare earth up to 40%, add FeB to make the B content in the powder excessive ...

Embodiment 3

[0027] Put 30ml of NdFeB sludge waste into a flask, add 450ml of distilled water, and use a rotary evaporator to carry out water bath distillation. Under vacuum conditions, the temperature is raised stepwise, starting from 30°C, and increasing the temperature by 5°C every 10 minutes until 80°C. After the internal liquid was evaporated to dryness, the operation was repeated 3 times to obtain 25.26 g of distilled powder. Add 50.5ml of acetone to the distilled powder, ultrasonically clean 3 times, then add absolute ethanol, ultrasonically clean 2 times, each ultrasonic time is 15min, after removing the lotion, dry it under vacuum at 50°C to obtain pretreatment Back powder; Test XRF, the results are shown in Table 3.

[0028] According to the element content in Table 3 and RE 2 Fe 14 B stoichiometric ratio, adding Nd before reaction 2 o 3 Make the total amount of rare earth up to 40%, add FeB to make the B content in the powder excessive 8%, CaH 2 The mass of CaO is 1.3 times...

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Abstract

The invention discloses a short-process method for preparing high-performance sintered NdFeB magnets by using sintered NdFeB oil sludge waste, which belongs to the technical field of recycling sintered NdFeB oil sludge waste. It includes distillation of organic matter in oil sludge, ultrasonic washing of oil sludge powder, calcium reduction diffusion, ultrasonic rinsing and drying under magnetic field, powder mixing and sintering and other steps. Regenerated high-performance sintered NdFeB magnets are directly obtained from NdFeB oil sludge waste; in the process of oil sludge distillation, the method of vacuum stepwise temperature rise is used to effectively remove most of the organic matter. During the sludge powder washing process, magnetic field ultrasonic treatment is used to effectively remove residual organic matter. The maximum magnetic energy product of the regenerated NdFeB sintered magnet obtained by doping nano-powder reaches 35.26MGOe. The invention has the advantages of short flow, high efficiency and environmental protection, and high rare earth recovery and utilization rate.

Description

technical field [0001] The invention belongs to the technical field of recycling sintered NdFeB sludge waste, and relates to a short-flow method for preparing high-performance sintered NdFeB magnets by using sintered NdFeB sludge waste. Background technique [0002] Compared with other magnetic materials, NdFeB magnetic materials have excellent magnetic and mechanical properties. Therefore, it is widely used in many fields such as electronic information, household appliances, medical treatment, aerospace, etc., especially plays an important role in the fields of new green energy such as energy-saving vehicles and wind power generation. 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 produce NdFeB waste, including cutting blocks and sludge waste. Take China as an example: China is a major producer of NdFeB materials. In 2013, the output ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F3/16B22F8/00H01F41/02H01F1/057
CPCB22F3/16B22F8/00B22F2009/001B22F2998/10B22F2999/00C22C2202/02H01F1/0577H01F41/0253C22C38/002C22C38/005C22C38/02C22C38/06C22C38/10C22C38/12C22C38/14C22C38/16C22C38/60Y02W30/50B22F3/02B22F3/10B22F9/04B22F9/20B22F2201/20B22F2202/05B22F2202/15
Inventor 岳明李萌刘卫强李现涛张东涛
Owner BEIJING UNIV OF TECH
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