Method for rapidly and efficiently recycling neodymium iron boron waste

A NdFeB, Scrap Technology

Pending Publication Date: 2018-08-03
江西离子型稀土工程技术研究有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main problem of this method is that a large amount of waste acid water is produced during the production process, and the waste material needs to be prepared separately, which cannot handle NdFeB mud powder, and needs to be mixed with alloy powder, the process is cumbersome, and the cost is also high

Method used

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  • Method for rapidly and efficiently recycling neodymium iron boron waste
  • Method for rapidly and efficiently recycling neodymium iron boron waste

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] (1) Batching furnace:

[0037] Weigh 16KG of massive NdFeB waste, weigh 3KG of NdFeB superfine powder and 3KG of pretreated oil sludge respectively, and press the powder into blocks. The oil sludge has been pre-burned in a rotary kiln at a temperature of 300°C and a burning time of 30 minutes. When loading the furnace, first place 8KG blocky waste on the bottom of the induction heating furnace, then place 6KG pressed powdery waste in the middle of the furnace, and finally place the remaining 8KG blocky waste on the upper and surrounding sides of the furnace.

[0038] (2) Non-vacuum smelting reduction:

[0039] After all the materials are loaded into the furnace, induction heating and smelting is carried out under non-vacuum conditions, and the temperature is raised rapidly until the materials are completely melted, and then the temperature is controlled at about 1500-1800°C for 5-30 minutes, and then casting is carried out to obtain ferroalloy ingots and slag.

[0040...

Embodiment 2

[0055] (1) Batching furnace:

[0056] Weigh 10KG of bulk NdFeB waste, 2KG of rare earth metal, 3KG of NdFeB superfine powder and 3KG of pretreated oil sludge, and press the powder into blocks. The oil sludge has been pre-burned in a rotary kiln at a temperature of 300°C and a burning time of 30 minutes. When loading the furnace, first place 6KG blocky waste and 2KG rare earth metals on the bottom of the induction heating furnace, then place 6KG pressed powdery waste in the middle of the furnace, and finally place the remaining 4KG blocky waste on the upper and surrounding sides of the furnace .

[0057] (2) Non-vacuum smelting reduction:

[0058] After all the materials are loaded into the furnace, induction heating and smelting is carried out under non-vacuum conditions, and the temperature is raised rapidly until the materials are completely melted, and then the temperature is controlled at about 1500-1800°C for 5-30 minutes, and then casting is carried out to obtain ferro...

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Abstract

The invention discloses a method for rapidly and efficiently recycling neodymium iron boron waste. The method comprises the steps that neodymium iron boron magnet waste is collected; the waste is divided into blocky waste and powdery waste, and oil sludge of the powdery waste is pretreated; the powdery waste is pressed into blocks and then charged, and a deoxidant is added according to the addingproportion of the powdery waste and the blocky waste; other alloy element oxides except rare earth in the waste are subjected to smelting reduction and deoxidation through rare earth metal in the blocky waste and the deoxidant; smelting reduction can be conducted in a medium-frequency induction furnace or an electric-arc furnace; a ferroalloy product and furnace slag are obtained after smelting iscompleted; the furnace slag is crushed, then molten salt electrolysis is conducted, and misch metal or rare earth ferroalloy is obtained; and chemical components of ferroalloy and chemical componentsof rare earth alloy are detected, alloy composition and impurity content of cast ingots are obtained, and the cast ingots are provided for neodymium iron boron manufacturers to be used as raw materials or used as intermediate alloy for other purposes after being detected to be qualified.

Description

technical field [0001] The present invention relates to the technical field of metallurgical preparation, in particular to a method for quickly and efficiently recycling NdFeB waste, which uses NdFeB waste to regenerate ferroalloys and mixed rare earth metals, and realizes efficient and green synergy of all alloy elements of NdFeB waste Recycle. Background technique [0002] NdFeB permanent magnets are a new generation of rare earth permanent magnet materials with high magnetic properties and high cost performance. They are widely used in many fields such as automobiles, computers, electronics, machinery, energy, and medical equipment. In the production process of NdFeB magnets, more waste materials are often produced, including cutting waste, slag, sintered blanks, scraps, substandard products, heavily oxidized powder, and heavily polluted cutting mud, etc., the total amount of which reaches About 30% of the total input material. These wastes contain a large amount of rar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B59/00C25C3/36C22B15/00C22B21/00C22B23/02
CPCC22B7/001C22B15/0026C22B21/0069C22B23/023C22B59/00C25C3/36Y02P10/20
Inventor 杨新华张金祥邱小英姚清海卢小能
Owner 江西离子型稀土工程技术研究有限公司
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