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Production technology of harmless high-purity vanadium pentoxide

The technology of vanadium pentoxide and production process is applied in the field of production technology of harmless high-purity vanadium pentoxide, which can solve the problems of high impurity content of vanadium pentoxide, equipment corrosion, large heat consumption and the like, and achieve high recovery efficiency, achieve zero emissions, and improve the effect of purity

Inactive Publication Date: 2013-06-12
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the process of evaporating and concentrating the filtrate, not only will a large amount of heat be consumed, but also the ammonia nitrogen wastewater will seriously corrode the equipment during the evaporation process.
According to the traditional method of producing vanadium pentoxide, the treatment cost of ammonia nitrogen wastewater accounts for 1 / 3-1 / 5 of its production cost; in addition, since there is no suitable method to remove the impurities entrained in the vanadium precipitation process in the subsequent process, Therefore, the impurity content of vanadium pentoxide obtained by the above process is relatively high, and the grade of vanadium pentoxide is generally only about 98%.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] To pH 8.2, containing V 2 o 5 Add sulfuric acid in 1000ml of 38.25g / L sodium vanadate aqueous solution to adjust the pH value of the solution to 1.6, then stir at 95°C for 1 hour, filter and wash after stirring, to obtain red vanadium and vanadium-precipitated liquid; The latter liquid first absorbs the residual vanadium and chromium in D315, then cools to 5°C to crystallize and precipitate sodium sulfate, then adds calcium oxide to adjust the pH of the solution to 7.5 and returns it to the production process of sodium vanadate solution for recycling; red vanadium is used at a solid-to-liquid ratio of 1:5g / ml is added to the sulfuric acid-ammonium sulfate solution containing 0.5mol / L hydrogen ion and 0.6mol / L ammonium ion, stirred at 30°C for 5 hours to remove impurities, and then the red vanadium after the removal of impurities is heated at 550°C C was calcined for 1 hour to obtain V with a purity of 99.79%. 2 o 5 product. Add ammonium sulfate to the red vanadium ...

Embodiment 2

[0031] To pH 0.2, containing V 2 o 5 Add sodium hydroxide in the pentavalent vanadium aqueous solution 1500ml of 47.63g / L and adjust the pH value of solution to 2.1, then stir at 80 DEG C for 2 hours, filter and wash after stirring, obtain red vanadium and the liquid after precipitation of vanadium; After the vanadium liquid is cooled to 3°C to crystallize and precipitate sodium sulfate, it is returned to the pentavalent vanadium aqueous solution production process for recycling; red vanadium is added to the hydrogen ion concentration of 1.5mol / L and ammonium ion according to the solid-liquid ratio of 1:2g / ml. In the sulfuric acid-ammonium sulfate mixed solution with a concentration of 2mol / L, stir at 85°C for 1 hour to remove impurities, and then calcinate the red vanadium after removing impurities at 500°C for 2.5 hours to obtain V with a purity of 99.87%. 2 o 5 product. Add lime and sodium bicarbonate to the solution after removing impurities from red vanadium, adjust th...

Embodiment 3

[0033] To pH 10.2, containing V 2 o 5 Add sulfuric acid in the sodium vanadate aqueous solution of 96.15g / L600ml, the pH value of solution is adjusted to 1.0, then stir 4 hours at 65 ℃, filter after stirring, wash, obtain red vanadium; According to solid-liquid ratio 1:6g / ml, the concentration of red vanadium is added to the sulfuric acid-ammonium sulfate solution that the concentration of hydrogen ions is 2.5mol / L and the concentration of ammonium ions is 4.5mol / L (prepared in Example 2), and stirred for 3 hours at 60°C Removal of impurities, then calcining the red vanadium after removal of impurities at 520°C for 2 hours to obtain a V with a purity of 99.91%. 2 o 5 product. Add sodium hydroxide to the impurity-removed liquid of red vanadium, adjust the pH value of the solution to 7.5, precipitate impurities such as iron and silicon in the solution, filter again, and then cool the impurity-removed liquid to 7°C to crystallize Sodium sulfate crystals are filtered, then am...

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Abstract

The invention discloses a production technology of high-purity vanadium pentoxide and a treatment method of ammonia-nitrogen wastewater. The production technology concretely comprises the following steps of: carrying out hydrolysis and molybdenum precipitation on a pentavalent vanadium solution, removing impurities by taking sulfuric acid-ammonium sulfate solution as an impurity removing agent after obtaining red vanadium, burning the purified red vanadium to obtain high-purity vanadium pentoxide; in addition, cooling via liquid and crystallizing sodium sulfate after molybdenum precipitation, returning to the pentavalent vanadium solution production procedure to use in cycle; supplying sulfuric acid and ammonium sulfate to the solution to prepare a cleaning agent after removing sodium of cooled and crystallized sodium sulfate from the purified liquid of red vanadium, and returning to the red vanadium impurity-removing procedure to use in cycle. The refined vanadium prepared by the production technology is high in purity, less in reagent dosage, and free of ammonia-nitrogen wastewater discharge; and the entire craft process is closed cycle of water, and low in production cost.

Description

technical field [0001] The invention belongs to the field of inorganic chemistry, and in particular relates to a production process of harmless high-purity vanadium pentoxide. Background technique [0002] Vanadium pentoxide is an important vanadium compound, which is widely used in metallurgy, chemical industry and other industries. The traditional method of vanadium pentoxide production is the ammonium salt precipitation method, that is, first adjust the pH value of the solution containing pentavalent vanadium to 8.5-9.5, and then press the V in the solution to 2 o 5 The mass ratio of ammonium salt to ammonium salt is 1: 1.3-1.5. Add ammonium salt to precipitate ammonium metavanadate, or first adjust the pH value of the solution to 1.5-2.5 and then add ammonium salt to precipitate ammonium polyvanadate. The obtained ammonium metavanadate Or ammonium polyvanadate can be calcined to obtain vanadium pentoxide. In addition, some people use the neutralization hydrolysis meth...

Claims

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Application Information

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IPC IPC(8): C01G31/02
Inventor 王学文王明玉
Owner CENT SOUTH UNIV
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