Ammonium metavanadate preparation method

A technology of ammonium metavanadate and ammonium vanadate, applied in chemical instruments and methods, vanadium compounds, inorganic chemistry, etc., can solve the problems of large amount of waste water, high production cost, large consumption of ammonium salt and sodium salt, etc. The effect of simplifying steps, reducing burden, and reducing costs

Active Publication Date: 2013-12-04
PANGANG GRP PANZHIHUA STEEL & VANADIUM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the invention of the present invention is to overcome the large consumption of ammonium salt and sodium salt existing in the process of preparing high-purity ammonium metavanadate in the prior art, the unstable quality of the high-purity ammonium metavanadate obtained, and the large amount of waste water And the defect that production cost is high, provide a kind of stable quality of the prepared ammonium metavanadate, ammonium salt usage is few, cost is low, and the preparation method of the high-purity ammonium metavanadate of environmental friendliness

Method used

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Examples

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preparation example Construction

[0011] The preparation method of ammonium metavanadate provided by the invention may further comprise the steps:

[0012] 1) Contact sodium vanadate solution with ammonium salt under acidic conditions, precipitate and separate the contacted product to obtain ammonium polyvanadate solid;

[0013] 2) The ammonium polyvanadate solid is contacted with water and an ammonium vanadate structural reformer, so that the ammonium polyvanadate is converted into ammonium metavanadate, and the contacted product is subjected to solid-liquid separation to obtain an ammonium metavanadate solution; The ammonium vanadate structural reformer is one or more of ammonium carbonate, ammonium bicarbonate and ammonia water.

[0014] In the present invention, the sodium vanadate solution is not particularly limited, as long as it is a sodium vanadate solution commonly used in the art to prepare ammonium metavanadate. For example, the sodium vanadate solution may be a solution obtained by sodium-roastin...

Embodiment 1

[0039] This embodiment is used to illustrate the preparation of ammonium metavanadate

[0040] 1) Add 10g of aluminum sulfate to 1000ml of sodium vanadate solution (based on vanadium element, the concentration of vanadium in sodium vanadate solution is 30g / L; pH is 12), then stir at 90°C for 30 minutes, and cool to Filtration was performed after room temperature to obtain the filtrate. Add sulfuric acid (concentration of sulfuric acid is 98% by weight) to the obtained filtrate to adjust the pH value to 5, then add ammonium sulfate (the molar ratio of the vanadium element in the sodium vanadate solution and the nitrogen element in the ammonium sulfate is 1:0.8 ), stirred at 95°C for 40 minutes, adjusted the pH to 1.9 with sulfuric acid (concentration of sulfuric acid: 98% by weight), kept at the same temperature for 40 minutes, and filtered to obtain ammonium polyvanadate solid.

[0041] 2) At 70°C, mix and beat the ammonium polyvanadate solid obtained with deionized water acc...

Embodiment 2

[0043] This embodiment is used to illustrate the preparation of ammonium metavanadate

[0044] 1) Add 12g of aluminum sulfate to 1000ml of sodium vanadate solution (based on vanadium element, the concentration of vanadium in sodium vanadate solution is 35g / L; pH is 12), then stir at 90°C for 30 minutes and then filter A filtrate was obtained. Add sulfuric acid (concentration of sulfuric acid is 98% by weight) to the obtained filtrate to adjust the pH value to 6, then add ammonium sulfate (the molar ratio of the vanadium element in the sodium vanadate solution and the nitrogen element in the ammonium sulfate is 1:0.9 ), stirred at 95°C for 45 minutes, adjusted the pH to 2.1 with sulfuric acid (concentration of sulfuric acid: 98% by weight), kept at the same temperature for 45 minutes, and filtered to obtain ammonium polyvanadate solid.

[0045] 2) At 80°C, mix and beat the ammonium polyvanadate solid obtained with deionized water according to the vanadium concentration (calcul...

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Abstract

The present invention discloses an ammonium metavanadate preparation method, which comprises that: a sodium vanadate solution contacts an ammonium salt under an acid condition, and the contacting product is subjected to precipitation and separation to obtain an ammonium polyvanadate solid; and the ammonium polyvanadate solid contacts water and an ammonium vanadate structure reforming agent to convert the ammonium polyvanadate into ammonium metavanadate, and the contacting product is subjected to solid-liquid separation to obtain an ammonium metavanadate solution, wherein the ammonium vanadate structure reforming agent is one or a plurality materials selected from ammonium carbonate, ammonium bicarbonate and ammonia water. According to the ammonium metavanadate preparation method, ammonium ions of the original ammonium polyvanadate can be completely utilized so as to reduce ammonium salt consumption; alkality of the ammonium vanadate structure reforming agent is completely adopted to achieve ammonium polyvanadate dissolving, such that the sodium salt (sodium hydroxide, sodium carbonate, and the like) is not required to be adopted to dissolve the ammonium polyvanadate so as to simplify steps and reduce cost; and no converted ammonia gas escapes so as to reduce burden on the environment .

Description

technical field [0001] The invention relates to a preparation method of ammonium metavanadate. Background technique [0002] Ammonium metavanadate (AMV for short), white or slightly light yellow crystalline powder, molecular formula: NH 4 VO 3 , Molecular weight: 116.98, relative density 2.326; melting point 200°C, slightly soluble in cold water, hot ethanol and ether, soluble in hot water and dilute ammonium hydroxide; when burned in air, it turns into vanadium pentoxide, which is poisonous. It is mainly used as chemical reagent, catalyst, drier, mordant, etc. It is widely used as glaze in ceramic industry, and can also be used to prepare vanadium pentoxide. [0003] In industrial production, the sodium vanadate solution is first prepared by sodium-roasting and water-immersing the vanadium-containing raw materials, and then the sodium vanadate solution is prepared through impurity removal and purification, and then ammonium metavanadate is stirred and precipitated with am...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G31/00
Inventor 李千文侯海军殷兆迁李彩霞赵小平
Owner PANGANG GRP PANZHIHUA STEEL & VANADIUM
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