Impurity removal method of oil-based neodymium iron boron oil sludge waste

An oil-based neodymium and neodymium-iron-boron technology, applied in the field of rare earth permanent magnet material recycling, can solve the problems of high carbon and hydrogen content, affecting cleaning effect, complex composition of cutting fluid, etc., and achieve the effect of low cost and short process.

Active Publication Date: 2019-09-10
BEIJING UNIV OF TECH
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Problems solved by technology

In addition, the composition of the cutting fluid is very complex, and contains a lot of high-boiling organic matter, resulting in high carbon and hydrogen content.
On the one hand, it is difficult to remove organic matter by distillation; on the other hand, it is tightly wrapped in the sludge, which seriously affects the cleaning effect
In conclusion, purification of oil-based waste is more difficult than water-based sludge
[0006] At present, the existing water-based NdFeB sludge waste treatment methods are not suitable for the treatment of oil-based sludge waste, and an efficient, short-process, and environmentally friendly impurity removal method for oil-based NdFeB sludge waste is developed to obtain carbon, hydrogen, and Single-phase regenerated NdFeB powder with low content of oxygen and other impurities is a process invention of great significance for saving rare earth resources and realizing the regeneration and utilization of rare earth permanent magnets

Method used

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  • Impurity removal method of oil-based neodymium iron boron oil sludge waste
  • Impurity removal method of oil-based neodymium iron boron oil sludge waste

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The main phase of oil-based slicing processing sintered NdFeB sludge waste ① is Nd 2 Fe 14 B. After sedimentation and centrifugation, organic impurities and NdFeB powder are separated to a certain extent, but they are still muddy. Take 10g of oil-based slice sludge and put it in a beaker, add 100ml of absolute ethanol, and perform ultrasonic cleaning at room temperature for 15min, with mechanical stirring during the process. The obtained mixed solution is magnetically separated to remove liquid, non-magnetic powder and solid impurities to obtain solid powder. At this time, the carbon content of the powder is 2.00%, the oxygen content is 5.95%, the hydrogen content is 1.76%, and the saturation magnetization at 3T is 136.59emu / g. Prepare 100ml of solution, including 1% hydrochloric acid, 5% OP-10 emulsifier, and water as the balance. After stirring evenly, use it to ultrasonically clean the obtained solid powder at room temperature for 2 minutes. After magnetic separat...

Embodiment 2

[0030] Oil-based slice processing sintered NdFeB oil sludge waste No. ② The main phase is Nd 2 Fe 14B, After precipitation, organic impurities and NdFeB powder are separated to a certain extent, but they are still muddy. Take 10g of oil-based slice sludge and put it in a beaker, add 100ml of absolute ethanol, and perform ultrasonic cleaning at room temperature for 15min, with mechanical stirring during the process. The obtained mixed solution is magnetically separated to remove liquid, non-magnetic powder and solid impurities to obtain solid powder. Among them, the carbon content is 2.00%, the oxygen content is 5.95%, the hydrogen content is 1.76%, and the saturation magnetization at 3T is 136.59emu / g. Prepare 100ml of solution, including 2% hydrochloric acid, 1% OP-10 emulsifier, and water as the balance. After stirring evenly, use it to ultrasonically clean the obtained solid powder at room temperature for 2 minutes. After magnetic separation, repeat the above process. Th...

Embodiment 3

[0032] The main phase in the oil-based slice processing sintered NdFeB oil sludge waste ③ is Nd 2 Fe 14 B, After precipitation, organic impurities and NdFeB powder are separated to a certain extent, but they are still muddy. Take 10g of oil-based slice sludge and put it in a beaker, add 100ml of absolute ethanol, and perform ultrasonic cleaning at room temperature for 15min, with mechanical stirring during the process. The obtained mixed solution is magnetically separated to remove liquid, non-magnetic powder and solid impurities to obtain solid powder. Among them, the carbon content is 2.00%, the oxygen content is 5.95%, the hydrogen content is 1.76%, and the saturation magnetization at 3T is 136.59emu / g. Prepare 100ml of solution, including 1% hydrochloric acid, 1% OP-10 emulsifier, and water as the balance. After stirring evenly, use it to ultrasonically clean the obtained solid powder at room temperature for 2 minutes. After magnetic separation, repeat the above process...

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Abstract

The invention discloses an impurity removal method of oil-based neodymium iron boron oil sludge wastes, and belongs to the technical field of recycling of rare earth permanent magnetic materials. Aiming at the problems of high content of carbon, hydrogen and oxygen, fine powders, extremely easy agglomeration of the powders and the like in oil-based slicing oil sludge wastes, an organic solvent, aninorganic solvent, a surfactant and an acid solution are used for cleaning the inorganic impurities oil sludge wastes, organic impurities, oxides and inorganic impurities in the oil sludge are removed by combining an ultrasonic and magnetic separation method, and regenerated neodymium iron boron powders which are low in carbon, hydrogen and oxygen content, good in performance and relatively highin purity are obtained. The method has the significant characteristics and advantages that, 1) the process is short, and the oil sludge is used as raw materials to directly obtain the regenerated neodymium iron boron powders; 2), the efficiency is high, and the performance of the regenerated powders is good, and the purity of the regenerated powders is relatively high; 3) the cost is low, and theconsumed energy in the process flow is less and the used raw materials and reagents are easy to obtain; and 4) the process is simple and easy to operate, and the repeatability is good.

Description

technical field [0001] The invention relates to a process for removing impurities from sintered NdFeB sludge waste, which directly obtains regenerated NdFeB powder through a green and efficient short-flow process, and belongs to the technical field of recycling rare earth permanent magnet materials. Background technique [0002] Sintered NdFeB is a rare earth permanent magnet material widely used in high-tech fields such as electronic information, hard disk drives, nuclear magnetic resonance instruments and wind power generators. In recent years, due to the increase in the price of rare earth metals, the production cost of rare earth permanent magnet materials has increased significantly. During the production and processing of NdFeB, about 45% of the total weight will be generated, such as scraps and oil sludge, which contain very precious rare earth elements, such as neodymium, praseodymium, dysprosium, terbium, holmium, etc. In order to comply with the development of cir...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B59/00H01F1/057H01F41/00
CPCC22B7/006C22B59/00H01F1/0571H01F41/00Y02P10/20
Inventor 岳明邱玉冰路清梅王峰刘卫强尹小文徐海波
Owner BEIJING UNIV OF TECH
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