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Regenerated alloy prepared based on neodymium iron boron oil sludge material and preparation method thereof

A recycled alloy and neodymium-iron-boron technology, which is applied in the direction of improving process efficiency, can solve the problems of limited ability to reduce rare earth oxides, no consideration of the order of feeding, low recycled alloys, etc., to achieve short recovery path, shorten recovery path, The effect of reducing reaction time

Active Publication Date: 2021-06-01
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the use of chloride as a low melting point auxiliary agent can reduce the reaction time, this method does not consider the order of feeding in the calcithermal reduction process, and further steps such as immersion and decalcification are required, and the process is relatively complicated.
In addition, due to the relatively active rare earths, the ability of Ca to reduce rare earth oxides is limited, and it is difficult to obtain recycled alloys with extremely low oxygen content.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0082] This embodiment provides a recycled alloy prepared based on NdFeB oil sludge and its preparation method. The preparation method includes the following steps:

[0083] (1) Wash and stir the NdFeB wire cutting oil sludge in sequence, put it aside for 10 minutes, filter, dry, and cool to room temperature to obtain solid powder; the washing liquid used in the washing is acetone, and the solid-liquid volume The ratio is 1:5; the stirring is carried out with an electric mixer, the stirring rate is 450rpm, and the time is 60min; the suction filtration is carried out in a vacuum suction filter; the drying temperature is 400°C, and the time is 4h, and Carried out under argon protection; the oxygen content of the solid powder is 13.2wt%, the iron content is 60wt%, the rare earth content is 25.2wt%, and the rest are other trace elements;

[0084] (2) First mix 4kg of anhydrous calcium chloride powder and 2kg of solid powder obtained in step (1) in a molybdenum crucible, and place ...

Embodiment 2

[0091] This embodiment provides a recycled alloy prepared based on NdFeB oil sludge and its preparation method. The preparation method includes the following steps:

[0092] (1) The NdFeB perforated oil sludge is washed and stirred successively, 8 minutes of static layering, suction filtration, drying, and cooling to room temperature to obtain a solid powder; the washing liquid used in the washing is ethanol, and the solid-liquid volume The ratio is 1:4; the stirring is carried out with an electric mixer, the stirring rate is 400rpm, and the time is 80min; the suction filtration is carried out in a vacuum suction filter; the drying temperature is 300°C, and the time is 5h, and Carried out under nitrogen protection; the oxygen content of the solid powder is 5.5wt%, the iron content is 66.3wt%, the rare earth content is 26.2wt%, and the rest are other trace elements;

[0093] (2) First mix 3kg of anhydrous sodium chloride powder and 2kg of solid powder obtained in step (1) in a ...

Embodiment 3

[0100] This embodiment provides a recycled alloy prepared based on NdFeB oil sludge and its preparation method. The preparation method includes the following steps:

[0101] (1) The NdFeB double-sided grinding oil sludge is washed and stirred successively, 12 minutes of static stratification, suction filtration, drying, and cooling to room temperature to obtain a solid powder; the washing liquid used in the washing is acetic acid, solid-liquid The volume ratio is 1:6; the stirring is carried out by an electric mixer, the stirring rate is 500rpm, and the time is 40min; the suction filtration is carried out in a vacuum suction filter; the drying temperature is 500°C, and the time is 3h. And carried out in helium protection; the oxygen content of the solid powder is 7.82wt%, the iron content is 64.5wt%, the rare earth content is 25.4wt%, and the rest are other trace elements;

[0102] (2) In the molybdenum crucible, mix 6kg anhydrous potassium chloride powder and 2kg step (1) gai...

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Abstract

The invention provides a regenerated alloy prepared based on neodymium iron boron oil sludge and a preparation method thereof. The preparation method comprises the following steps that (1) the neodymium iron boron oil sludge is pretreated, and solid powder is obtained; (2) the solid powder obtained in the step (1) is subjected to calcium thermal reduction treatment, and primary alloy is obtained; and (3) the primary alloy obtained in the step (2) is subjected to electroslag remelting treatment, a regenerated alloy is obtained, and the oxygen content of the regenerated alloy is smaller than or equal to 0.1 wt%. According to the provided preparation method, the operation process is simplified, the reaction time is shortened, non-metal impurities are further removed, and the purity of the regenerated alloy is improved.

Description

technical field [0001] The invention belongs to the technical field of industrial waste recovery and reuse, and relates to a recycled alloy, in particular to a recycled alloy prepared based on NdFeB oil sludge and a preparation method thereof. Background technique [0002] NdFeB magnetic materials are widely used in many fields such as national defense and military industry, electronic information, medical equipment, and clean energy because of their advantages such as high coercive force, high remanence, and high magnetic energy product. China is the world's largest producer of NdFeB, with an annual output of 170,000 tons in 2018, accounting for nearly 90% of the world's total output. According to statistics, more than 90% are sintered NdFeB. In the NdFeB production process, from raw material pretreatment to final product testing, every process inevitably produces waste. Among them, 20-30% oil sludge will be produced in the machining process, which is the largest category...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B5/04C22B7/00C22B1/00C22B9/10C22B9/18C22B59/00C22C33/04C22C38/00
CPCC22B5/04C22B9/18C22B59/00C22B7/001C22B1/005C22B9/10C22C33/04C22C38/005C22C38/002Y02P10/20
Inventor 王志李世健钱国余王东
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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