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Method for preparing vanadium pentoxide from vanadium-containing solution

A technology of vanadium pentoxide and solution, applied in the direction of vanadium oxide, etc., can solve the problems of high cost and difficult wastewater purification, and achieve the effect of improving quality and avoiding ammonia nitrogen wastewater

Inactive Publication Date: 2011-08-31
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the product quality of vanadium pentoxide produced by ammonium salt precipitation is guaranteed, it is difficult and costly to purify wastewater

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] With V 2 O 5 60.83g / L vanadium slag sodium roasting water extract 500ml, add concentrated hydrochloric acid to adjust the pH to 1.5, stir for 1 hour at 95℃, filter and wash the red vanadium filter cake, and calcinate the red cake at 350℃ for 2 hours to obtain vanadium pentoxide , The vanadium pentoxide obtained by calcination is leached at a solid-liquid ratio of 1:5g / ml and stirred at 80°C for 1 hour, filtered, dried at 85°C for 3 hours, and dried to obtain V with a purity of 99.5% 2 O 5 product.

Embodiment 2

[0020] Take V 2 O 5 1000ml of vanadium leaching solution containing 45.26g / L of vanadium, adding sodium chlorate, stirring at 85°C for 1 hour to oxidize the trivalent and tetravalent vanadium in the solution to pentavalent vanadium, and then adding hydroxide Adjust the pH value of sodium to 1.0, continue stirring at 85°C for 1.5 hours, filter and wash the red cake, calcining the red cake at 550°C for 1 hour to obtain vanadium pentoxide, and add water to the vanadium pentoxide obtained by calcination at a solid-liquid ratio of 1:3g / ml Stirring at 90℃, leaching for 1.5 hours, filtering, 125℃ drying for 1 hour, drying to obtain V with a purity of 99.9% 2 O 5 product.

Embodiment 3

[0022] 300ml of alkali leaching-ion exchange desorption solution containing 120g / L of stone coal oxidation roasting containing V2O5, adjust the pH to 2.0 with concentrated sulfuric acid, stir for 2.5 hours at 65°C, filter and wash to obtain red cake, and calcined red cake at 450°C for 1.5 hours to obtain pentoxide Vanadium, the vanadium pentoxide obtained by calcination was leached at a solid-to-liquid ratio of 1:8g / ml, stirred at 50°C for 2.5 hours, filtered, and dried at 85°C for 3.5 hours to obtain a V2O5 product with a purity of 99.7%.

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PUM

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Abstract

The invention relates to a method for preparing vanadium pentoxide from vanadium-containing solution. The method mainly comprises the following steps of: oxidizing the vanadium-containing solution, adjusting the pH value, settling red vanadium or directly adjusting the pH value to settle the red vanadium; and calcining the red vanadium to obtain the vanadium pentoxide, washing sodium by using the vanadium pentoxide, and drying to obtain a refined vanadium product. The method has the advantages of good quality of product, small using amount of reagent, low production cost and the like, and the ammonia nitrogen waste water is not produced.

Description

Technical field [0001] The invention relates to a method for producing vanadium pentoxide from a vanadium-containing solution. Background technique [0002] Vanadium is an important metal element, it is widely used in metallurgy, chemical industry and other industries. Vanadium pentoxide is not only a product of vanadium metallurgy, but also a raw material for smelting metal vanadium and ferro-vanadium alloys. At present, the raw materials used to produce vanadium pentoxide mainly include vanadium slag and stone coal obtained from the smelting process of vanadium-titanium magnetite. The commonly used process for extracting vanadium from vanadium slag is: sodium salt roasting of vanadium slag→water leaching→vanadium precipitation by ammonium salt→calcining to obtain refined vanadium. The most commonly used process for extracting vanadium from stone coal is: stone coal acid leaching→reduction→extraction → Reverse extraction → oxidation → ammonium salt precipitation of vanadium → ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G31/02
Inventor 王学文王明玉
Owner CENT SOUTH UNIV
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