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Preparation method of high-purity vanadium pentoxide

A high-purity vanadium pentoxide technology, which is applied in the field of preparation of high-purity vanadium pentoxide by multi-stage remelting operation, can solve the problems of increased dosage, complicated operation, and long process flow, and achieves low environmental pollution , easy operation and simple process

Inactive Publication Date: 2013-02-13
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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Problems solved by technology

However, with the increase of vanadium concentration, the amount of extraction agent and ion exchange resin will increase sharply, resulting in the increase of the production cost of the whole vanadium product, so it is relatively less used in industrial production; the chemical precipitation purification method removes impurities by adding The precipitant removes the impurity elements in the vanadium, but the process is long and the operation is complicated, and the impurity elements in the precipitant are introduced into the vanadium product, making it difficult to improve the purity of the vanadium product

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  • Preparation method of high-purity vanadium pentoxide

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[0014] The invention provides a kind of preparation method of high-purity vanadium pentoxide, and described preparation method comprises the following steps:

[0015] (1) Redissolving the crude vanadium in the alkali solution, and then filtering to remove metal impurities in the crude vanadium that precipitated with the alkali solution to obtain the first-stage return solution.

[0016] Wherein, the crude vanadium is metallurgical grade vanadium pentoxide, and the crude vanadium used in the present invention contains metal ion impurities such as chromium and sodium and non-metal ion impurities such as silicon. Preferably, the alkali solution adopts sodium hydroxide solution, and further, the sodium hydroxide solution can adopt analytically pure sodium hydroxide solution, of course other can dissolve the vanadium in the crude vanadium and react with the metal cation in the crude vanadium to generate hydroxide Alkaline solutions for the precipitation of substances are acceptable...

example 1

[0023] The thick vanadium of 100g is redissolved in sodium hydroxide solution (made by mixing 50g sodium hydroxide solid and 400ml deionized water), and the pH value of the resulting solution is 8.93, and then filtered to remove insoluble impurities to obtain the first-level return solution; Prepare a sulfuric acid solution with 200ml of concentrated sulfuric acid and 600ml of deionized water, then slowly pour the resulting 1100ml first-stage return solution into the prepared sulfuric acid solution, while stirring, and adjust the pH value to 1.0. The continuous addition of the first-stage return solution produces a large amount of red solid, and the viscosity of the solution increases. At this time, deionized water is added at a liquid-solid ratio of 1:1 to dilute the solution so that impurities Si enter the liquid phase and vanadium enters the solid phase. , to obtain a solid-liquid mixture, and realize solid-liquid separation by suction filtration. After the precipitate obtai...

example 2

[0025] The thick vanadium of 100g is redissolved in sodium hydroxide solution (made by mixing 50g sodium hydroxide solid and 400ml deionized water), and the pH value of the resulting solution is 8.93, and then filtered to remove insoluble impurities to obtain the first-level return solution; Prepare a sulfuric acid solution with 200ml of concentrated sulfuric acid and 600ml of deionized water, then slowly pour the resulting 1100ml first-stage return solution into the prepared sulfuric acid solution, while stirring, and adjust the pH value to 2.0. The continuous addition of the first-stage return solution produces a large amount of red solid, and the viscosity of the solution increases. At this time, deionized water is added at a liquid-solid ratio of 1:1 to dilute the solution so that impurities Si enter the liquid phase and vanadium enters the solid phase. , to obtain a solid-liquid mixture, and realize solid-liquid separation by suction filtration. After the precipitate obtai...

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Abstract

The invention discloses a preparation method of high-purity vanadium pentoxide. The preparation method comprises the following steps of: returning and dissolving coarse vanadium in aqueous alkali, and filtering the solution to remove metal impurities, which are subjected to precipitation reaction with the aqueous alkali, in the coarse vanadium, thus obtaining a primary returned solution; slowly pouring the primary returned solution into a sulfuric acid solution, adjusting the pH value of the solution to be 1.0-2.0 to obtain a liquid-solid mixture, and performing solid-liquid separation on the liquid-solid mixture; filtering and washing precipitates obtained from the solid-liquid separation of the mixture, and returning and dissolving the mixture into the aqueous alkali, thus obtaining a secondary returned solution; adding ammonium sulfate into the secondary returned solution for precipitating vanadium, and filtering the solution to obtain ammonium metavanadate; and processing the ammonium metavanadate to obtain the high-purity vanadium pentoxide. The preparation method adopting multiple stages of returned dissolving can be used for effectively removing the metal canon impurities of the vanadium pentoxide, and further obtaining the high-purity vanadium pentoxide with the metal canon impurity contents of less than 0.001% and the vanadium pentoxide content of 99.99%.

Description

technical field [0001] The invention relates to a preparation method of vanadium pentoxide, more specifically, relates to a preparation method of high-purity vanadium pentoxide by using multi-stage back-melting operation. Background technique [0002] Vanadium is an important resource, because of its inherent physical and chemical properties, vanadium is widely used in various fields of national defense and economic construction. Since vanadium is used in aerospace materials, special steels and alloys, the control of impurity elements is strictly required, so the purity requirements of vanadium products are also getting higher and higher, and the research on the preparation method of high-purity vanadium is particularly important . According to different vanadium-containing mineral resources, the impurity elements and content in vanadium products are different, but most of the impurity elements are metal impurities and silicon. At present, the commonly used methods for pur...

Claims

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Application Information

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IPC IPC(8): C01G31/02
Inventor 彭穗杨林江李道玉毛凤娇
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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