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
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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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