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
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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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