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Method for recovering neodymium iron boron alloy powder from neodymium iron boron oil sludge wastes by shot flow and preparation method of regenerated sintered magnet

A technology for recycling NdFeB and sintered magnets, applied in the direction of improving process efficiency, etc., can solve the problems of long process flow and environmental pollution, achieve the effects of shortening the process, reducing production costs, and realizing recycling and reuse

Pending Publication Date: 2019-06-07
JIANGSU JICUI ANTAI CHUANGMING ADVANCED ENERGY MATERIALS RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the final product of the hydrometallurgical process is rare earth oxides or metals, the process is long, and waste acid and liquid are produced, polluting the environment

Method used

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  • Method for recovering neodymium iron boron alloy powder from neodymium iron boron oil sludge wastes by shot flow and preparation method of regenerated sintered magnet
  • Method for recovering neodymium iron boron alloy powder from neodymium iron boron oil sludge wastes by shot flow and preparation method of regenerated sintered magnet

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Weigh 50g of NdFeB sludge waste into a crucible, heat at 350°C for 5 hours, and dry to obtain 46.1g of sludge powder; test XRF, the results are shown in Table 1. According to the contents of rare earth elements and iron elements in Table 1, add 0.4g of neodymium hydride powder, 0.1g of FeB powder, and 5.9g of calcium particles to the sludge powder, mix the reactants evenly, cover them with molybdenum sheets, and put them into a tube furnace , first carry out hydrogen reduction in hydrogen at 350°C for 90 minutes, and then carry out calcium reduction and diffusion reaction under the protection of inert gas. Ultrasonic water washing under 0.5kOe magnetic field, washing 6 times, 10min each time, and finally washing once with acetone, time 20min; drying under vacuum condition, temperature 400 ℃, time 90min, to obtain 23.3g NdFeB alloy powder, particle size is About 8μm, the recovery rate of NdFeB is 50.5%.

[0038] Add 20wt% neodymium hydride powder (particle size less tha...

Embodiment 2

[0042] Weigh 50g of NdFeB sludge waste into a crucible, heat at 200°C for 8 hours, and dry to obtain 45.8g of sludge powder; test XRF, the results are shown in Table 2. According to the content of each element in Table 2, add 0.3g of neodymium hydride powder, 0.1g of FeB powder, and 6.7g of calcium particles to the oil sludge powder, mix the reactants evenly, cover them with molybdenum sheets, put them into the tube furnace, and Carry out hydrogen reduction at 400°C for 30 minutes in hydrogen, and then carry out calcium reduction and diffusion reaction under the protection of inert gas. Ultrasonic water washing, washing 3 times, each time 20min, and finally washing once with acetone, time 10min; drying under vacuum conditions, temperature 400 ℃, time 150min, to obtain 23.1g of NdFeB alloy powder, the particle size is about 8μm, neodymium The recovery rate of iron and boron is 50.4%.

[0043] Add 10wt.% neodymium hydride powder (particle size less than 5 microns) and ball mill...

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Abstract

The invention discloses a method for recovering neodymium iron boron alloy powder from neodymium iron boron oil sludge wastes by a shot flow. The method comprises the following steps: an oil sludge waste drying step: the neodymium iron boron oil sludge wastes are dried to obtain neodymium iron boron oil sludge; and a reduction dispersing step: FeB, neodymium / neodymium-contained compounds and Ca are fed in the neodymium iron boron oil sludge for hydrogen reduction and calcium reduction dispersing reaction to obtain neodymium iron boron alloy powder and calcium oxide mixtures. The invention further discloses a preparation method of a regenerated sintered magnet, a neodymium iron boron sintered magnet and a neodymium iron boron bonded magnet. The method prevents such processes as distillationand acid dissolution through direct drying of the neodymium iron boron oil sludge wastes, shortens the flow, achieves high efficiency and environmental protection, and reduces the production cost. The magnetic energy product of the prepared sintered magnet reaches 33 MGOe.

Description

technical field [0001] The invention relates to the technical field of recycling NdFeB oil sludge, in particular to a short-process method for recycling NdFeB oil sludge to prepare a regenerated sintered magnet and the NdFeB sintered magnet. Background technique [0002] Due to its excellent magnetic properties, sintered NdFeB is widely used in many fields such as hybrid vehicles, wind power generation, medical equipment and electronic products. As its annual output increases year by year, more and more scraps are produced. In the production process of sintered NdFeB, about 1 / 4 of the final product output will be generated, especially in the process of mechanical cutting and grinding. A large amount of sludge waste will be generated. The waste contains a large amount of rare earth elements Nd and Dy, etc. Therefore, the recovery of NdFeB sludge has received more and more attention in recent years. [0003] The recovery of NdFeB oil sludge waste mainly adopts hydrometallurg...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B5/12C22B5/04B22F3/10B22F3/24
CPCY02P10/20
Inventor 周少雄李现涛张广强李宗臻董帮少郑伟张迁
Owner JIANGSU JICUI ANTAI CHUANGMING ADVANCED ENERGY MATERIALS RES INST CO LTD
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