Method for preparing high-purity vanadium pentoxide through sodium polyvanadate

A technology for vanadium pentoxide and sodium polyvanadate, applied in the field of preparing high-purity vanadium pentoxide, can solve the problems affecting the quality of vanadium oxide products, the purity is less than 95wt%, etc., and achieve good social and economic benefits and environmental friendliness , The effect of the process is simple and easy to use

Inactive Publication Date: 2014-08-27
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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  • Summary
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AI Technical Summary

Problems solved by technology

Wherein, in the step of hydrolyzing vanadium precipitation, because the sodium content in the sodium polyvanadate precipitation that hydrolysis generates is as high as 6~15wt%, thereby cause the purity of the vanadium pentoxide prepared to be no more than 95wt%, seriously affect the vanadium oxide product quality
[0004] At present, there is no relevant literature to disclose the process research on the production of high-purity vanadium pentoxide after sodium polyvanadate is removed from sodium polyvanadate, so it is necessary to provide a method that can effectively remove sodium ions in sodium polyvanadate and ensure the quality of vanadium oxide products

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0034] Preparation mass concentration is 5% ammonium carbonate solution at normal temperature, the sodium polyvanadate that will have the composition listed in table 1 is ground to can pass through 120 mesh sieves, then gets the sodium polyvanadate after the grinding of 100g and joins in 1000ml In the above ammonium carbonate solution, stir and react for 30 min. Then filter, wash twice with pure water with a liquid-solid ratio of 2:1, and then dry for 5 hours to obtain sodium-free ammonium polyvanadate; then calcinate the obtained sodium-free ammonium polyvanadate to obtain vanadium pentoxide.

[0035] After testing, the sodium ion in the obtained sodium-free ammonium polyvanadate is 0.01%, the purity of the vanadium pentoxide obtained after calcination is greater than 99.5%, the vanadium content in the washing liquid is 0.05g / L, and the vanadium yield is greater than 99%. .

example 2

[0037] Prepare the ammonium bicarbonate solution that the mass concentration is 10% at normal temperature, the sodium polyvanadate with the composition listed in Table 1 can pass through a 120 mesh sieve, then get the sodium polyvanadate after 100g grinding and add to the above-mentioned 1000ml Ammonium bicarbonate solution, stirred for 120min. Then filter, wash twice with pure water with a liquid-solid ratio of 3:1, and then dry for 8 hours to obtain sodium-free ammonium polyvanadate; then calcinate the obtained sodium-free ammonium polyvanadate to obtain vanadium pentoxide.

[0038] After testing, the sodium ion in the obtained sodium-free ammonium polyvanadate is 0.005%, the purity of the vanadium pentoxide obtained after calcination is greater than 99.6%, the vanadium content in the washing liquid is 0.03g / L, and the vanadium yield is greater than 99.1%. .

example 3

[0040] It is the ammonium oxalate solution that preparation mass concentration is 27% at normal temperature, and the sodium polyvanadate that will have the composition listed in table 1 is ground to can pass through 120 mesh sieves, then gets the sodium polyvanadate after the grinding of 100g and joins in 1000ml In the above-mentioned ammonium oxalate solution, stir and react for 60 minutes. Then filter, wash twice with pure water with a liquid-solid ratio of 2:1, and dry for 12 hours to obtain sodium-free ammonium polyvanadate; then calcinate the obtained sodium-free ammonium polyvanadate to obtain vanadium pentoxide.

[0041] After testing, the sodium ion in the obtained sodium-free ammonium polyvanadate is 0.008%, the purity of the vanadium pentoxide obtained after calcination is 99.7%, the vanadium content in the washing liquid is 0.03g / L, and the vanadium yield is greater than 99.2%.

[0042] In summary, the present invention adopts a one-step process of removing sodium, ...

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Abstract

The invention discloses a method for preparing high-purity vanadium pentoxide through sodium polyvanadate. The method includes the following steps that a, a sodium removal agent aqueous solution is prepared, wherein a sodium removal agent is at least one of ammonium carbonate, ammonium bicarbonate and ammonium oxalate; b, the finely grinded sodium polyvanadate is added to the sodium removal agent aqueous solution, filtering, washing and drying are carried out after the stirring reaction, and sodium-free sodium polyvanadate is obtained; c, the high-purity vanadium pentoxide is obtained after the sodium-free sodium polyvanadate is calcinated. The process of removing sodium through one step is adopted, the removal rate of sodion in the sodium polyvanadate reaches about 99%, sodion content of vanadium pentoxide obtained through later preparation is very low, yield of vanadium also reaches more than 99%, and the problem that prepared vanadium pentoxide is not high in purity due to the fact that the sodium content in sodium polyvanadate obtained after hydrolysis of vanadium precipitation exceeds the standard is solved.

Description

technical field [0001] The invention belongs to the technical field of vanadium compound production, and more specifically relates to a method for preparing high-purity vanadium pentoxide by using sodium polyvanadate. Background technique [0002] Vanadium is an important metal with many excellent properties and is widely used in various fields. About 85% of vanadium in the world is used in the steel industry, and the remaining about 15% is mainly used in aerospace alloys, vanadium batteries, chemical industry, catalysts and other industries. [0003] Generally, the process of producing vanadium oxide from vanadium slag includes the steps of raw material pretreatment-roasting-leaching-vanadium precipitation-calcination and so on. Wherein, in the step of hydrolyzing vanadium precipitation, because the sodium content in the sodium polyvanadate precipitation that hydrolysis generates is as high as 6~15wt%, thereby cause the purity of the vanadium pentoxide prepared to be no mo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B34/22
Inventor 殷兆迁伍珍秀付自碧郭继科陈相全
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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