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Method for extracting rare earth oxides from polishing powder waste materials

A rare earth oxide and polishing powder technology, which is applied in the direction of improving process efficiency, can solve the problems of polluting the environment, low rare earth leaching yield, and difficulty in meeting the technical requirements of polishing powder waste recycling, so as to improve the recovery rate of rare earth and meet the The effect of green environmental requirements

Active Publication Date: 2018-09-14
HUNAN RARE EARTH METAL MATERIAL RES INST
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Problems solved by technology

This method generally has low rare earth leaching yield, and the chemical raw materials used to recover rare earths are finally discharged with ammonia water, resulting in environmental pollution and other problems, so it is difficult to meet the recovery process requirements of polishing powder waste.

Method used

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  • Method for extracting rare earth oxides from polishing powder waste materials

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0069] 1, dissolving: 100g polishing powder waste material (the REO of 64.4wt%, the Al of 2.44wt% 2 o 3 , 13.32wt% SiO 2 , 0.23% MgO, 5.53wt% F and 0.82wt% CaO) were added into 150 g of the first hydrochloric acid with a molar concentration of 10 mol / L, heated to 90° C. and stirred and dissolved for 2 hours to obtain a mother liquor containing rare earth elements.

[0070] 2. Evaporation and impurity removal: Evaporate and concentrate the above-mentioned rare earth element-containing mother liquor at 50° C. to nearly dryness, add 400 g of hot water after cooling, stir and dissolve, and press filter to obtain the impurity-removed rare earth element-containing mother liquor.

[0071] 3. Extraction and impurity removal: adjust the pH value of the above-mentioned rare earth element-containing mother liquor after impurity removal to 1 with 0.5mol / L fourth hydrochloric acid, add an organic extractant to extract twice (wherein the organic extractant and the rare earth element after ...

Embodiment 2

[0077] 1, dissolving: 100g polishing powder waste material (the REO that contains 64.4wt%, the Al of 2.44wt% 2 o 3 , 13.32wt% SiO 2 , 0.23% MgO, 5.53wt% F and 0.82wt% CaO) were added into 300g of the first hydrochloric acid with a molar concentration of 12mol / L, heated to 100°C and stirred and dissolved for 2 hours to obtain a mother liquor containing rare earth elements.

[0078] 2. Evaporation and impurity removal: Evaporate and concentrate the above-mentioned rare earth element-containing mother liquor at 70° C. to nearly dryness, add 400 g of hot water after cooling, stir and dissolve, and press filter to obtain the impurity-removed rare earth element-containing mother liquor.

[0079] 3. Extraction and impurity removal: adjust the pH value of the above-mentioned rare earth element-containing mother liquor after impurity removal to 3 with 1mol / L fourth hydrochloric acid, and add an organic extractant to extract three times (wherein the organic extractant and the rare eart...

Embodiment 3

[0085] Embodiment 3 is substantially the same as embodiment 1, and the difference is that the dissolving step of embodiment 3 is:

[0086] Dissolving: with 100g polishing powder waste material (the REO that contains 64.4wt%, the Al of 2.44wt% 2 o 3 , 13.32wt% SiO 2 , 0.23% MgO, 5.53wt% F and 0.82wt% CaO) were added into 250g of the first hydrochloric acid with a molar concentration of 9mol / L, heated to 90° C. and stirred and dissolved for 2 hours to obtain a mother liquor containing rare earth elements.

[0087] After testing, the rare earth oxide obtained in Example 3 contains 99.15wt% REO, 0.0017wt% Al, 0.0014wt% Si, 0.0020wt% Mg, 0.0011wt% F and 0.0025wt% Ca. The yield of rare earth oxide was 91.15%.

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Abstract

The invention provides a method for extracting rare earth oxides from polishing powder waste materials. The method comprises the following steps of dissolving, evaporating impurity removal, extractingimpurity removal, washing impurity removal, and back extracting and burning. According to the method for extracting the rare earth oxides from the polishing powder waste, rare earth in the polishingpowder waste materials can be separated from silicon, aluminum, fluorine, calcium, magnesium and other impurities, and rare earth recovery rate can be effectively improved, no ammonia water is used inthe whole process, and the environment-friendly requirement is met.

Description

technical field [0001] The invention relates to the technical field of nonferrous metals, in particular to a method for extracting rare earth oxides from polishing powder waste. Background technique [0002] The polishing powder waste on the market is as high as hundreds of thousands of tons, which contains more than 65% of lanthanum-cerium mixed rare earth oxides. It is a valuable renewable resource. If it can be recycled, it will be beneficial to resource utilization and environmental protection, which is in line with national industrial policies. The traditional method of recovering valuable rare earths from polishing powder waste is mainly roasting-alkali leaching-purification and impurity removal-extraction separation and purification. This method generally has problems such as low rare earth leaching yield, and the chemical raw materials used to recover rare earths are finally discharged as ammonia water, resulting in environmental pollution and other problems, so it i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B59/00
CPCC22B7/007C22B59/00Y02P10/20
Inventor 刘荣丽王志坚樊玉川王贵超
Owner HUNAN RARE EARTH METAL MATERIAL RES INST
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