Method for selectively separating vanadium and chromium from vanadium and chromium-containing solution

A selective, vanadium-chromium technology, applied in the field of hydrometallurgy, to achieve the effect of selective deep separation of vanadium-chromium

Active Publication Date: 2020-06-19
ZHENGZHOU UNIV
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0008] Aiming at the problems that the existing vanadium-chromium separation technology is difficult to realize selective deep separation, the object of the present invention is to provide a method for selectively separating vanadium-chromium from the vanadium-chromium-containing solution, which uses selective floating extraction agent to vanadate ion The selectivity is regulated so that the flotation agent and polyvanadate form a molecular association, while the chromate is still in the solution, and then the vanadate component is selectively enriched and separated by floating extraction technology; Adding reducing agent, the Cr 6+ reduced to Cr 3+ , and then by adjusting the pH of the solution, the chromium can be converted into Cr(OH) 3 Precipitation in the form of precipitation, and finally the selective and efficient separation of vanadium and chromium

Method used

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  • Method for selectively separating vanadium and chromium from vanadium and chromium-containing solution

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Embodiment 1

[0025] A method for selectively separating vanadium-chromium from a vanadium-chromium-containing solution, such as figure 1 As shown, the process is as follows:

[0026](1) Add 1 mol / L hydrochloric acid and / or 1 mol / L sodium hydroxide to 1L of a solution with a vanadate concentration of 5 g / L and a chromate concentration of 5 g / L to adjust the pH of the solution to 6.8, Transform vanadium into polyvanadate and chromium into dichromate in the solution;

[0027] (2) Add a selective floating extraction agent to the above solution, the composition of which is: 50 parts by mass of primary amine N1923, 30 parts by mass of 1-octyl-3-methylimidazolium tetrafluoroborate, 20 parts by mass of tributyl phosphate Parts, the concentration is 10 g / L, add the association stabilizer, its composition is: 40 parts by mass of sodium sulfate, 30 parts by mass of sodium humate, 30 parts by mass of trisodium citrate, the concentration is 500 mg / L, then add Sodium hexametaphosphate dispersant, the ...

Embodiment 2

[0032] A method for selectively separating vanadium-chromium from a vanadium-chromium-containing solution, such as figure 1 As shown, the process is as follows:

[0033] (1) Add 1 mol / L hydrochloric acid and / or 1 mol / L sodium hydroxide to 1L of a solution with a vanadate concentration of 2 g / L and a chromate concentration of 500 mg / L to adjust the pH of the solution to 6.8 , so that the vanadium in the solution is converted into polyvanadate, and the chromium is converted into dichromate;

[0034] (2) Add a selective floating extraction agent to the above solution, the composition of which is: 60 parts by mass of primary amine N1923, 20 parts by mass of 1-octyl-3-methylimidazolium tetrafluoroborate, 20 parts by mass of tributyl phosphate Parts, the concentration is 4 g / L, add the association stabilizer, its composition is: 40 parts by mass of sodium sulfate, 30 parts by mass of sodium humate, 30 parts by mass of trisodium citrate, the concentration is 200 mg / L, then add Sodi...

Embodiment 3

[0039] A method for selectively separating vanadium-chromium from a vanadium-chromium-containing solution, such as figure 1 As shown, the process is as follows:

[0040] (1) Add 1 mol / L hydrochloric acid and / or 1 mol / L sodium hydroxide to 1L solution with a vanadate concentration of 100 mg / L and a chromate concentration of 100 mg / L to adjust the pH of the solution to 6.8, Transform vanadium into polyvanadate and chromium into dichromate in the solution;

[0041] (2) Add a selective floating extraction agent to the above solution, the composition of which is: 50 parts by mass of primary amine N1923, 30 parts by mass of 1-octyl-3-methylimidazolium tetrafluoroborate, 20 parts by mass of tributyl phosphate Parts, the concentration is 200 mg / L, add the association stabilizer, its composition is: 40 parts by mass of sodium sulfate, 30 parts by mass of sodium humate, 30 parts by mass of trisodium citrate, the concentration is 100 mg / L, then add Sodium hexametaphosphate dispersant, ...

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Abstract

The invention discloses a method for selectively separating vanadium and chromium from a vanadium and chromium-containing solution. The method comprises the following steps of adding a pH regulator into the vanadium and chromium-containing solution to convert vanadium in the solution into polyvanadate and chromium into dichromate, then adding a selective floating extraction agent into the solutionto promote the floating extraction agent and polyvanadate to form a molecular associate, adding an associate stabilizer and a bubble dispersant, introducing air to enable bubbles to be hydrophobically mineralized to form polyvanadate-floating extraction agent-bubble micro-droplets, and finally deeply enriching and separating polyvanadate components through floating extraction; and adding a reducing agent into the chromium-rich flotation raffinate to reduce Cr<6+> into Cr<3+>, finally regulating the pH value of the solution to separate out chromium in the form of Cr(OH)3 precipitation, and drying and calcining the vanadium-rich and chromium-rich components to obtain the high-purity vanadium-chromium product. The method is good in selective separation effect on vanadium and chromium, simplein technological process, low in operation cost and particularly suitable for deep separation of vanadium and chromium.

Description

technical field [0001] The invention belongs to the field of hydrometallurgy, and in particular relates to a method for selectively separating vanadium and chromium from a solution by means of a floating extraction method. Background technique [0002] As important scarce strategic metal resources, vanadium and chromium are widely used in iron and steel, metallurgy, chemical industry, medicine, aerospace and other fields. Vanadium and chromium belong to the transition metals of the fourth period. They are located next to each other in the periodic table and have very similar physical and chemical properties. They often exist in vanadium-titanium magnetite and chromite in nature. Vanadium and chromium products have higher requirements on the content of associated elements, such as V 2 o 5 The chromium content is required to be less than 0.15 wt%, Cr 2 o 3 The vanadium content is required to be less than 0.1 wt%. However, the accompanying existence of vanadium and chromiu...

Claims

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Application Information

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IPC IPC(8): C22B34/22C22B34/32C22B3/40C22B3/44
CPCC22B34/22C22B34/32C22B3/44C22B3/409Y02P10/20
Inventor 韩桂洪刘兵兵黄艳芳苏盛鹏薛毓斌王益壮
Owner ZHENGZHOU UNIV
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