Method for preparing high purity ammonium poly-vanadate

A technology of ammonium polyvanadate and sodium ammonium vanadate, applied in chemical instruments and methods, vanadium compounds, inorganic chemistry, etc., can solve the problems of high-purity ammonium polyvanadate product production technology that has not been reported, and achieve a good society Benefits and economic benefits, easy to operate, simple process effect

Inactive Publication Date: 2017-09-01
HEBEI IRON AND STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] It can be seen by inquiring about related technologies that ammonium vanadate, whether it is ammonium polyvanadate or ammonium metavanadate, is currently used as a raw material for vanadium products. There are many technologies in the production process of conventional products, but it involves iron, chromium, aluminum and other metal elements. Low production technology of high-purity ammonium polyvanadate product has not been reported

Method used

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Examples

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Effect test

Embodiment 1

[0021] A method for preparing high-purity ammonium polyvanadate. In the vanadium-containing purified leaching solution (the concentration of vanadium is 15g / L), ammonia gas is passed through the microporous distribution, reacted for 2 hours, and the pH value is controlled to 4.5. After stirring and filtering, the obtained Sodium ammonium vanadate: After adding water, sodium ammonium vanadate is heated and dissolved at 50°C to make the vanadium concentration of the solution reach 25g / L. Add ammonium bicarbonate and adjust the pH value to 2.0 to obtain high-purity ammonium polyvanadate with a purity of 90.1%. , The vanadium yield is 92%, and the impurity content is shown in Table 1.

[0022] The pressure of ammonia gas is 0.1Mpa, and the gas flow rate for treating each liter of vanadium-containing purified leachate is 0.018L / min; the microporous gas distribution device is a polytetrafluoroethylene material filter element, the shape is hemispherical, and the micropore diameter is ...

Embodiment 2

[0024] A method for preparing high-purity ammonium polyvanadate. In the vanadium-containing purified leaching solution (the concentration of vanadium is 20g / L), ammonia gas is passed through microporous gas distribution, reacted for 2 hours, and the pH value is controlled to 5.0. After stirring and filtering, the obtained Sodium ammonium vanadate: After adding water, sodium ammonium vanadate is heated and dissolved at a temperature of 55°C to make the vanadium concentration of the solution reach 30g / L. Add ammonium bicarbonate and adjust the pH value to 2.5 to obtain high-purity ammonium polyvanadate with a purity of 90.0%. , The vanadium yield is 93%, and the impurity content is shown in Table 1.

[0025] The pressure of ammonia gas is 0.2Mpa, and the gas flow rate for treating each liter of vanadium-containing purified leachate is 0.024L / min; the microporous gas distribution device is a polytetrafluoroethylene material filter element, which is hemispherical in shape and has a...

Embodiment 3

[0027] A method for preparing high-purity ammonium polyvanadate. In the vanadium-containing purified leaching solution (the concentration of vanadium is 22g / L), ammonia gas is passed through microporous gas distribution, reacted for 2 hours, and the pH value is controlled to 5.5. After stirring and filtering, the obtained Sodium ammonium vanadate: After adding water, sodium ammonium vanadate is heated and dissolved at 60°C to make the vanadium concentration of the solution reach 32g / L. Add ammonium bicarbonate and adjust the pH value to 2.3 to obtain high-purity ammonium polyvanadate with a purity of 90.5%. , The yield of vanadium is 91.9%, and the impurity content is shown in Table 1.

[0028] The pressure of ammonia gas is 0.3Mpa, and the gas flow rate for treating each liter of vanadium-containing purified leachate is 0.027L / min; the microporous gas distribution device is a polytetrafluoroethylene filter element, which is hemispherical in shape and has a micropore diameter o...

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Abstract

A method for preparing high-purity ammonium polyvanadate belongs to the technical field of hydrometallurgy and vanadium chemical industry. The method comprises the following steps: feeding ammonia gas into the vanadium-containing purified leaching solution, adjusting the pH value to 4.0-7.0, stirring, Sodium ammonium vanadate is obtained after filtration; the sodium ammonium vanadate is heated and dissolved after adding water, ammonium salt is added and the pH value is adjusted to 2.0-3.0 to obtain high-purity ammonium polyvanadate. The method has the advantages of simple process, low cost, and easy operation. The content of the prepared high-purity ammonium polyvanadate is greater than 90%, and the vanadium yield is greater than 90%. It has good social and economic benefits and is convenient for industrial promotion.

Description

technical field [0001] The invention belongs to the technical field of hydrometallurgy and vanadium chemical industry, and particularly relates to a method for preparing high-purity ammonium polyvanadate. Background technique [0002] Ammonium polyvanadate is a vanadium product with high vanadium content, which can be used as the main raw material in various vanadium production fields. Especially the raw material for the preparation of vanadium pentoxide and other vanadium oxide products. According to the product's requirements on the quality of vanadium oxide products, it is necessary to control the entry of impurity elements into the solid phase of ammonium vanadate during the production process of ammonium vanadate, so the quality of ammonium vanadate directly determines the quality of other vanadium oxide products. [0003] Patent 200710201754.3 provides a preparation method of ammonium polyvanadate, which adopts calcium method to dissolve and obtain ammonium polyvanada...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G31/00
CPCC01G31/00C01P2006/80
Inventor 朱立杰徐从美卢明亮
Owner HEBEI IRON AND STEEL
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