Method for extracting and separating vanadium and chromium from alkaline aqueous solution

An alkaline aqueous solution and an aqueous solution technology are applied in the field of hydrometallurgy, which can solve the problems of inability to extract and separate vanadium and chromium, and achieve the effects of convenient operation, large single-stage separation coefficient and low process cost.

Inactive Publication Date: 2015-06-10
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

Under weakly alkaline conditions, vanadium-chromium has a certain separation effect, but when the alkali concentration increases, it is still impossible to extract and separate vanadium-chromium

Method used

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  • Method for extracting and separating vanadium and chromium from alkaline aqueous solution

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] (1) Add 0.1 g of sodium sulfate to 20 mL of vanadium-chromium-containing alkali metal sodium hydroxide aqueous solution (the mass fraction of sodium hydroxide is 0.01%) to obtain a mixed aqueous solution;

[0048] (2) Fully mix 0.45mol / L hydrochloric acid solution and secondary carbon primary amine according to the volume ratio of 4:1 and let it stand to obtain a system in which the upper and lower layers of liquid coexist. Take the upper organic phase to obtain the acidified secondary Primary carboamines;

[0049] (3) the acidified secondary carboprimary amine and secondary octanol are mixed according to a volume ratio of 1:1 to obtain an organic solution;

[0050] (4) The organic solution and the above-mentioned mixed aqueous solution are mixed and extracted at room temperature according to a volume ratio of 1:1, and then left to stand after being fully mixed to obtain a system in which two layers of liquid coexist, the upper layer is a vanadium-rich organic phase, an...

Embodiment 2

[0055] (1) Add 2.2g of sodium sulfate to 20mL of vanadium-chromium-containing alkali metal sodium carbonate aqueous solution (the massfraction of sodium carbonate is 1%) to obtain a mixed aqueous solution;

[0056] (2) Fully mix 1.5mol / L hydrochloric acid solution and trioctylmethyl ammonium chloride according to the volume ratio of 5:1 and let it stand to obtain a system in which the upper and lower layers of liquid coexist. Take the upper organic phase to obtain the acidified Treated trioctylmethyl ammonium chloride;

[0057] (3) Trioctylmethyl ammonium chloride after acidification treatment is mixed with tributyl phosphate according to a volume ratio of 10:1 to obtain an organic solution;

[0058] (4) The organic solution and the above-mentioned mixed aqueous solution are mixed and extracted at room temperature according to a volume ratio of 1:80, and then left to stand after being fully mixed to obtain a system in which the upper and lower layers of liquid coexist, the upp...

Embodiment 3

[0063] (1) Add 0.15 g of sodium sulfate to 20 mL of vanadium-chromium-containing alkali metal sodium bicarbonate aqueous solution (pH=11) to obtain a mixed aqueous solution;

[0064] (2) After fully mixing 0.5mol / L nitric acid solution and tributyl tertiary amine according to the volume ratio of 6:1, let it stand to obtain a system in which the upper and lower layers of liquid coexist, take the upper organic phase, and obtain the acidified Tributyl tertiary amine;

[0065] (3) tributyl tertiary amine after the acidification treatment is mixed with isooctyl alcohol according to a volume ratio of 2:1 to obtain an organic solution;

[0066] (4) The organic solution and the above-mentioned mixed aqueous solution are mixed and extracted at room temperature according to a volume ratio of 1:50, and then left to stand after being fully mixed to obtain a system in which two layers of liquid coexist, the upper layer is a vanadium-rich organic phase, and the lower layer is chromium enri...

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Abstract

The invention discloses a method for extracting and separating vanadium and chromium from an alkaline aqueous solution. The method comprises the following steps: adding sulfate, carbonate and/or phosphate into the alkaline aqueous solution containing vanadium and chromium; adding an acidized amine extraction agent obtained by mixing with an acid solution in advance, mixing with the alkaline aqueous solution containing vanadium and chromium, and extracting vanadium, wherein chromium is not extracted and remains in the alkaline aqueous solution; after extraction, an organic phase loaded with vanadium can be subjected to reverse extraction by using an alkali metal salt, alkali metal hydroxides, sulfuric acid or aqueous nitric acid solution and can be acidized again to be recycled. According to the method disclosed by the invention, the vanadium and chromium can be extracted and separated from the concentrated alkaline aqueous solution with the pH value of more than 11, the single stage separation coefficient of the vanadium and chromium is large, the process flow is simple, and the extraction agent can be recycled.

Description

technical field [0001] The invention belongs to the field of hydrometallurgy, in particular to a method for extracting and separating vanadium and chromium from alkaline aqueous solution. Background technique [0002] The separation of vanadium and chromium has always been a difficult problem in industry. At present, chemical precipitation, ion exchange, extraction and other methods are mainly used in industry to separate vanadium and chromium in aqueous solution. [0003] The chemical precipitation method mainly uses the difference in the conditions for the precipitation of vanadium and chromium in the solution to control different conditions so that the selective precipitation of vanadium and chromium occurs, thereby realizing the separation of the two. Generally, by adjusting the pH value of the vanadium-chromium-containing aqueous solution to about 2, the vanadium is first precipitated in the form of ammonium vanadate. Reduction with sodium sulfide is then used to prec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B3/40C22B34/22C22B34/32
CPCY02P10/20
Inventor 黄焜孙盼刘会洲
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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