Pretreatment method of oil sludge obtained after neodymium-iron-boron material grinding through machine tool

A NdFeB pretreatment technology, which is applied in the field of pretreatment of NdFeB machine tool abrasive sludge, can solve environmental pollution, waste of rare earth resources and other problems, and achieve the effect of simple operation and good temperature control

Inactive Publication Date: 2013-01-30
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, this method is not only a great waste of rare earth resources, but also causes huge pollution to the local environment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] Add a small amount of distilled water to the beaker to dissolve the sludge generated after a small amount of abrasives. Take 10ml of the mixed liquid and pour it into the spinner bottle. Fix the rotary bottle on the right end of the rotary shaft, close the vacuum valve, vacuumize, and keep the pressure in the tube at 0.01MPa, set the temperature at 50°C and set the rotation speed at 10 rpm. At this time, turn on the heating button and the rotation button of the rotary evaporator, adjust the height of the rotary bottle, and then start the water bath heating. Keep the temperature, rotation speed and pressure constant for 1h30min, then the liquid in the rotary bottle can be evaporated to dryness. After cooling, the material body is taken out, and the rare earth oxides are obtained through acid dissolution, impurity removal, extraction separation, precipitation, and burning.

Embodiment 2

[0014] Add a small amount of distilled water to the beaker to dissolve the sludge generated after a small amount of abrasives. Take 10ml of the mixed liquid and pour it into the spinner bottle. Fix the rotary bottle on the right end of the rotary shaft, close the vacuum valve, vacuumize, and keep the pressure in the tube at 0.09MPa, set the temperature at 80°C and set the rotation speed at 150 rpm. At this time, turn on the heating button and the rotation button of the rotary evaporator, adjust the height of the rotary bottle, and then start the water bath heating. Keep the temperature, rotational speed and pressure constant for 51 minutes, then evaporate the liquid in the rotary bottle to dryness. After cooling, the material body is taken out, and the rare earth oxides are obtained through acid dissolution, impurity removal, extraction separation, precipitation, and burning.

Embodiment 3

[0016] Add a small amount of distilled water to the beaker to dissolve the sludge generated after a small amount of abrasives. Take 10ml of the mixed liquid and pour it into the spinner bottle. Fix the rotary bottle on the right end of the rotary shaft, close the vacuum valve, vacuumize, and keep the pressure in the tube at 0.10MPa, set the temperature at 100°C and set the rotation speed at 300 rpm. At this time, turn on the heating button and the rotation button of the rotary evaporator, adjust the height of the rotary bottle, and then start the water bath heating. Keep the temperature, rotational speed and pressure constant for 29 minutes, then evaporate the liquid in the rotary bottle to dryness. After cooling, the material body is taken out, and the rare earth oxides are obtained through acid dissolution, impurity removal, extraction separation, precipitation, and burning.

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PUM

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Abstract

The invention relates to a pretreatment method of oil sludge obtained after neodymium-iron-boron material grinding through a machine tool, belonging to the technical field of rare earth recovery. The pretreatment method comprises the following steps of: evenly dissolving oil sludge obtained after neodymium-iron-boron materials are ground, conducting distillation, keeping distillation temperature to be 50-100DEG C, rotating speed to be 10-300rpm (revolutions per minute) and atmospheric pressure to be 0.01-0.1MPa, and finally conducting acid dissolution, impurity removal, extraction separation, settlement and burning to residual products obtained after distillation to obtain rare earth oxides. By using the pretreatment method, the oil sludge is not needed to be oxidized and roasted during pretreatment, atmospheric pollution caused by dust is avoided and environmental protection is facilitated.

Description

technical field [0001] The invention relates to a pretreatment method for abrasive sludge of NdFeB machine tools. Background technique [0002] Since Japanese and American scientists discovered the (third generation) rare earth permanent magnet alloy based on NdFeB almost simultaneously in 1983, its huge magnetic energy product has refreshed the existing record of permanent magnet materials, causing a huge market for permanent magnet materials in the world. The change. The development of NdFeB in China is very fast, and the annual production capacity of nearly 100 enterprises in the country has reached nearly 100,000 tons. As we all know, in the production process of NdFeB materials, there are many scraps, defective products and scraps from cutting and grinding, and the total loss is as high as more than 30%. Therefore, it is important to strengthen the research and production of NdFeB waste recycling. significance. [0003] As the technology of recovering rare earths fr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/00C22B59/00
Inventor 刘敏赖伟鸿索红莉董传博金琼花岳明刘卫强张东涛马麟王毅
Owner BEIJING UNIV OF TECH
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