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Method for extracting vanadium pentoxide in Bayer-process seed-separating mother liquor

A technology of vanadium pentoxide and separation of mother liquor, applied in vanadium oxide and other directions, can solve problems such as no research reports, and achieve the effects of simple process, convenient operation and high recovery rate of vanadium

Inactive Publication Date: 2010-05-19
GUIZHOU BRANCH CHINA ALUMINUM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the research on vanadium extraction by ion exchange method mainly focuses on the recovery of vanadium in stone coal and spent catalysts, and there is no research report on the recovery of vanadium from mother liquor by Bayer process.

Method used

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  • Method for extracting vanadium pentoxide in Bayer-process seed-separating mother liquor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] with V 2 o 5 Add CaO 10g / L to the 0.42% seed separation mother liquor, stir and react for 2 hours at a temperature of 100°C, then filter, wash, and dry the precipitate to obtain a vanadium-containing precipitate. The chemical composition is: CaO 51.32%, Al 2 o 3 29.52%, SiO 2 4.61%, Na 2 O 0.68%, V 2 o 5 0.76%;

[0023] At 95°C, precipitate calcium vanadate (CaO 51.32%, Al 2 o 3 29.52%, SiO 2 4.61%, Na 2 O 0.68%, V 2 o 5 0.76%) add 40g / L of NaHCO in the amount of 200g / L 3 In the solution, pass 60L / h of CO 2 , stirred and reacted for 1h to obtain a vanadium leaching solution, the concentration of vanadium in the leaching solution was 1.19g / L;

[0024] Use 717 type strongly basic anion exchange resin to adsorb vanadium leaching solution, the solid (g) of resin and sodium vanadate solution: liquid (L) ratio is 20:1, adsorption temperature is 40 ℃, contact time is 1h, calculates the vanadium The adsorption rate is 95.2%;

[0025] Use 2.5mol / L NaOH solut...

Embodiment 2

[0028] with V 2 o 5 Add CaO 10g / L to the 0.42% seed separation mother liquor, stir and react for 2 hours at a temperature of 100°C, then filter, wash, and dry the precipitate to obtain a vanadium-containing precipitate. The chemical composition is: CaO 51.32%, Al 2 o 3 29.52%, SiO 2 4.61%, Na 2 O 0.68%, V 2 o 5 0.76%;

[0029] At 100°C, precipitate calcium vanadate (CaO 51.32%, Al 2 o 3 29.52%, SiO 2 4.61%, Na 2 O 0.68%, V 2 o 5 0.76%) add 60g / L of NaHCO in the amount of 200g / L 3 In the solution, pass 80L / h of CO 2 , stirred and reacted for 2h to obtain a vanadium leaching solution, the concentration of vanadium in the leaching solution was 1.25g / L;

[0030] Use 717 type strongly basic anion exchange resin to adsorb vanadium leaching solution, the solid (g) of resin and sodium vanadate solution: liquid (L) ratio is 25: 1, adsorption temperature is 45 ℃, contact time is 1.5h, calculates vanadium The adsorption rate is 96.3%;

[0031] Use 3mol / L NaOH solutio...

Embodiment 3

[0034] with V 2 o 5 Add CaO 15g / L to the 0.42% seed separation mother liquor, stir and react for 2 hours at a temperature of 102°C, and then filter, wash, and dry the precipitate to obtain a vanadium-containing precipitate. The chemical composition is: CaO 50.36%, Al 2 o 3 30.53%, SiO 2 4.08%, Na 2 O 0.60%, V 2 o 5 0.70%;

[0035] At 100°C, precipitate calcium vanadate (CaO 50.36%, Al 2 o 3 30.53%, SiO 2 4.08%, Na 2 O 0.60%, V 2 o 5 0.70%) add 60g / L of NaHCO with the amount of 200g / L 3 In the solution, pass 70L / h of CO 2 , stirred and reacted for 2h to obtain a vanadium leaching solution, the concentration of vanadium in the leaching solution was 1.09g / L;

[0036] Use 717 type strongly basic anion exchange resin to adsorb vanadium leaching solution, the solid (g) of resin and sodium vanadate solution: liquid (L) ratio is 20:1, adsorption temperature is 40 ℃, contact time is 1h, calculates the vanadium The adsorption rate is 94.9%;

[0037] Use 3mol / L NaOH ...

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Abstract

The invention relates to a method for extracting vanadium pentoxide in Bayer-process seed-separating mother liquor, which is characterized in that a process comprises the following steps: (1) adding CaO to Bayer-process seed-separating mother liquor in order to precipitate vanadium in the seed-separating mother liquor in the form of calcium vanadate; (2) dissolving precipitate in the form of calcium vanadate in NaHCO3 solution under the condition of supplying CO2 in order to obtain sodium vanadate solution; (3) performing V2O5 adsorption on the sodium vanadate solution through ion exchange resin; (4) using NaOH solution to elute saturated resin after adsorption and obtaining V2O5 eluent; and (5) adding NH4Cl to the eluent, precipitating ammonium metavanadate solid and obtaining V2O5 through filtration, drying and roasting. The method recovers the V2O5 in the seed-separating mother liquor during Bayer-process alumina production through seed-separating mother liquor vanadium precipitation, vanadium-containing precipitate leaching, resin adsorption, elution, secondary vanadium precipitation, ammonium metavanadate roasting and other processes. The method has the advantages of simple process, convenient operation, low cost and high recovery rate of vanadium.

Description

technical field [0001] The invention relates to a method for extracting vanadium pentoxide in Bayer process seed fraction mother liquor, in particular to a method for extracting vanadium pentoxide from Bayer seed fraction mother liquor by ion exchange resin adsorption. Background technique [0002] Vanadium is an important strategic material, which has the characteristics of high tensile strength, high hardness and high fatigue resistance, and is mainly used in the fields of ferroalloy and non-ferrous metal alloy industries. Vanadium is a resource-deficient metal, and there is no rich ore that can be mined alone, but it is symbiotic with other minerals at low grade. At present, more than 70% of the vanadium supplied in the world is produced from vanadium-rich iron slag, waste catalyst and coal ash. These raw materials have low grade vanadium and complex components. Therefore, the current various vanadium extraction technologies have high cost, Due to serious pollution, long...

Claims

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Application Information

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IPC IPC(8): C01G31/02
Inventor 赵卓尹中林
Owner GUIZHOU BRANCH CHINA ALUMINUM IND