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Method for precipitating and reclaiming vanadium from spent liquor of Bayer process

A technology of separation of mother liquor and Bayer method, which is applied in the field of precipitation and recovery of vanadium by separation of mother liquor by Bayer method, can solve the problems of aluminum loss, poor effect of vanadium precipitation, unfavorable treatment steps, etc., and achieve the effect of recycling vanadium precipitation, efficient extraction, and low cost Effect

Inactive Publication Date: 2010-12-29
GUIZHOU BRANCH CHINA ALUMINUM IND
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  • Summary
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  • Description
  • Claims
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Problems solved by technology

The use of lime as a vanadium precipitation agent has many disadvantages. Lime mainly reacts with aluminate in the mother liquor to form calcium aluminate hydrate, while the amount of lime reacted with vanadium anions is very small, which first causes a large loss of aluminum in the mother liquor and affects alumina. The production process has a certain influence, and secondly, the vanadium precipitation effect is poor, the vanadium precipitation rate is not high, and the vanadium content in the obtained precipitate is very low, which is not conducive to the subsequent processing steps

Method used

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  • Method for precipitating and reclaiming vanadium from spent liquor of Bayer process

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Experimental program
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Effect test

Embodiment 1

[0020] at V 2 o 5 BaO and Na 2 CO 3 Add BaO at a molar ratio of 0.4, stir and react at 40°C for 15 minutes, then filter, wash, and dry the precipitate to obtain a vanadium-containing precipitate. The chemical composition is: BaO 51.71%, Al 2 o 3 2.57%, SiO 2 7.31%, Na 2 O 2.45%, V 2 o 5 2.62%;

[0021] At 100°C, the vanadium-containing precipitate (BaO 51.71%, Al 2 o 3 2.57%, SiO 2 7.31%, Na 2 O2.45%, V 2 o 5 2.62%) was added 60g / L of Na in an amount of 1 with a liquid-solid ratio 2 CO 3 In the solution, stir and react for 1h to obtain a vanadium leaching solution, the concentration of vanadium in the leaching solution is 25.25g / L;

[0022] The leached slag was calcined at 1200°C for 2 hours and then taken out, and the BaO content was analyzed to be 99.01%.

Embodiment 2

[0024] at V 2 o 5 BaO and Na 2 CO 3 Add BaO at a molar ratio of 0.5, stir and react at 60°C for 30 minutes, then filter, wash, and dry the precipitate to obtain a vanadium-containing precipitate. Its chemical composition is: BaO 55.71%, Al 2 o 3 3.27%, SiO 2 7.55%, Na 2 O 3.41%, V 2 o 5 2.13%;

[0025] At 100°C, the vanadium-containing precipitate (BaO 55.71%, Al 2 o 3 3.27%, SiO 2 7.55%, Na 2 O3.41%, V 2 o 5 2.13%) add the Na of 80g / L with the amount that liquid-solid ratio is 1 2 CO 3 In the solution, stir and react for 2h to obtain a vanadium leaching solution, the concentration of vanadium in the leaching solution is 20.54g / L;

[0026] The leached slag was calcined at 1300°C for 2 hours and then taken out, and the BaO content was analyzed to be 99.18%.

Embodiment 3

[0028] at V 2 o 5 BaO and Na 2 CO 3 Add BaO at a molar ratio of 0.6, stir and react at 80°C for 60 minutes, then filter, wash, and dry the precipitate to obtain a vanadium-containing precipitate. Its chemical composition is: BaO 55.71%, Al 2 o 3 3.27%, SiO 2 7.55%, Na 2 O 3.41%, V 2 o 5 2.03%;

[0029] At 100°C, the vanadium-containing precipitate (BaO 55.71%, Al 2 o 3 3.27%, SiO 2 7.55%, Na 2 O3.41%, V 2 o5 2.13%) adding 100g / L of Na in an amount of 1 with a liquid-solid ratio 2 CO 3 In the solution, stir and react for 2h to obtain a vanadium leaching solution, the concentration of vanadium in the leaching solution is 18.97g / L;

[0030] The leached slag was calcined at 1400°C for 2 hours and then taken out, and the BaO content was analyzed to be 99.19%.

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Abstract

The invention relates to a method for precipitating and reclaiming vanadium from spent liquor of Bayer process. The method is characterized by comprising the following steps: (1) adding BaO into the Bayer process spent liquor to obtain mixed precipitate of barium carbonate and barium vanadate, and returning the liquor to an alumina producing process after the vanadium is precipitated; (2) leaching the mixed precipitate of the barium carbonate and the barium vanadate with Na2CO3, introducing the barium into the solution in the barium vanadate way to prepare the barium vanadate solution, and generating the barium carbonate simultaneously to obtain residual slag of the barium carbonate; and (3) calcining the residual slag of the barium carbonate to generate BaO, and circulating the vanadium precipitating process of the Bayer process spent liquor in the step (1). By adopting the method, the precipitate slag with high content of vanadium can be obtained, and the leachate is easily treated to obtain the vanadium products. A vanadium-leaching agent can be recycled with good vanadium precipitate effect, cannot cause aluminum loss in the liquor, does not affect the alumina producing process, can realize low cost, and effectively extracts the vanadium in the Bayer process spent liquor.

Description

technical field [0001] The invention relates to a method for reclaiming vanadium by precipitating mother liquor in Bayer method. Background technique [0002] Vanadium is an important alloying element whose main field of use is the iron and steel industry. Vanadium-containing steel has the advantages of high strength, high toughness, and good wear resistance, so it is widely used in industries such as machinery, automobiles, shipbuilding, railways, and bridges. However, the resources of vanadium are relatively scarce. At present, the extraction of vanadium can only use low-grade and complex vanadium-rich iron slag, spent catalysts and coal ash as raw materials. [0003] The alumina production process contains relatively abundant vanadium resources, and vanadium is a kind of impurity that is harmful to the alumina production process. Therefore, extracting vanadium from the alumina production process can not only eliminate its impact on the alumina production process , but a...

Claims

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Application Information

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IPC IPC(8): C22B34/22
CPCY02P10/20
Inventor 赵卓尹中林
Owner GUIZHOU BRANCH CHINA ALUMINUM IND
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