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A method for preparing high-purity ammonium metavanadate from sodium vanadium liquid

An ammonium metavanadate, high-purity technology, applied in chemical instruments and methods, vanadium compounds, inorganic chemistry and other directions, can solve the problems of low vanadium precipitation rate and low purity of ammonium metavanadate, achieve good social and economic benefits, equipment The effect of low requirements and simple and easy-to-use process

Active Publication Date: 2016-05-04
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the low problem of vanadium deposition rate and ammonium metavanadate purity in the prior art, and a new method for preparing high-purity ammonium metavanadate is provided

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] This example is used to illustrate the method for preparing high-purity ammonium metavanadate from sodiumized vanadium solution provided by the present invention.

[0030] Add 1000 mL of sodiumized vanadium solution in Table 1 to a 2000mL clean beaker, add polyvinyl alcohol according to the mass ratio of vanadium in the sodiumized vanadium solution of 0.05:1, and according to the provided NH 4 + The molar ratio to vanadium is 2:1. Add ammonium sulfate. After the ammonium sulfate is dissolved in the vanadium solution, use sulfuric acid to adjust the pH to 8.0, stir and react at 35°C for 40 minutes, then filter and wash to obtain wet vanadium. Ammonium acid, put the wet ammonium metavanadate into an oven at 40°C for drying, and the drying time is 12 hours.

[0031] The vanadium content in the upper layer liquid of vanadium precipitation is 0.16g / L, the vanadium precipitation rate is 99.5%, and the bulk density of ammonium metavanadate detected is 1.8g / cm 3 The purity of ammoniu...

Embodiment 2

[0033] This example is used to illustrate the method for preparing high-purity ammonium metavanadate from sodiumized vanadium solution provided by the present invention.

[0034] Add 1000 mL of the sodiumized vanadium solution in Table 1 to a 2000mL clean beaker, add polyvinyl alcohol according to the mass ratio of vanadium in the sodiumized vanadium solution of 0.1:1, and according to the provided NH 4 + The molar ratio to vanadium is 4:1. Add ammonium sulfate. After the ammonium sulfate is dissolved in the vanadium solution, adjust the pH to 10.0 with sulfuric acid, stir and react at 5°C for 120 minutes, then filter and wash to obtain wet vanadium. Ammonium acid, put the wet ammonium metavanadate into an oven at 60°C for drying, and the drying time is 12 hours.

[0035] The vanadium content in the upper layer of vanadium precipitation was 0.26g / L, the vanadium precipitation rate was 99.2%, and the bulk density of ammonium metavanadate was 1.7g / cm. 3 The purity of ammonium metavana...

Embodiment 3

[0037] This example is used to illustrate the method for preparing high-purity ammonium metavanadate from sodiumized vanadium solution provided by the present invention.

[0038] Add 1000 mL of sodiumized vanadium solution in Table 1 to a 2000mL clean beaker, add polyvinyl alcohol according to the mass ratio of vanadium in the sodiumized vanadium solution of 0.01:1, and according to the NH provided 4 + The molar ratio to vanadium is 1:1. Add ammonium sulfate. After the ammonium sulfate is dissolved in the vanadium solution, use sulfuric acid to adjust the pH to 7.0, stir, react at 25°C for 40 minutes, and then filter and wash to obtain wet vanadium. Ammonium acid, put the wet ammonium metavanadate into an oven at 40°C for drying, and the drying time is 12 hours.

[0039] The content of vanadium in the upper layer liquid of vanadium precipitation is 0.34g / L, the rate of vanadium precipitation is 99.0%, and the bulk density of ammonium metavanadate is 1.5g / cm. 3 The purity of ammonium...

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Abstract

The invention discloses a method used for preparing high-purity ammonium metavanadate from sodium vanadate solution. The method comprises following steps: (1) polyvinyl alcohol, a soluble ammonium salt, and sodium vanadate solution are mixed, pH value of an obtained mixture is adjusted to be 7 or slightly higher when the soluble ammonium salt is dissolved, and reaction is carried out at the pH value; and (2) a mixed material obtained via reaction is subjected to solid-liquid separation, and a solid material obtained via separation is subjected to drying. According to the method used for preparing high-purity ammonium metavanadate from sodium vanadate solution, surfactant polyvinyl alcohol and the soluble ammonium salt are added into sodium vanadate solution so as to precipitate ammonium metavanadate, vanadium precipitation rate is higher than 99%, density of obtained ammonium metavanadate is 1.5g / cm3, and purity is as high as 99.5%. The method is simple; equipment requirement is low; operation is convenient; application range is wide; cost is low; and social benefit and economic benefit are excellent.

Description

Technical field [0001] The invention relates to a method for preparing high-purity ammonium metavanadate from sodium vanadium solution. Background technique [0002] Ammonium metavanadate is a pale yellow or white crystalline powder, slightly soluble in cold water, hot acetaldehyde and ether, soluble in hot water and dilute ammonium hydroxide; it becomes vanadium pentoxide when burned in the air, which is toxic. Mainly used as chemical reagents, catalysts, driers, mordants, etc. It is widely used as a glaze in the ceramic industry, and can also be used to prepare vanadium pentoxide and vanadium trioxide. [0003] In industrial production, ammonium metavanadate is mainly extracted from sodium vanadium solution. "Vanadium and Titanium Materials" (by Yang Shaoli, published by Metallurgical Industry Press on August 31, 2007) introduces the ammonium metavanadate precipitation method. The method is to add ammonium chloride or sulfuric acid to the purified vanadium leaching solution Amm...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G31/00
Inventor 殷兆迁付自碧王俊高官金
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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