Method for preparing vanadium pentoxide
A technology of vanadium pentoxide and sodium hydroxide, which is applied in the direction of vanadium oxide, etc., can solve the problems of complicated operation, high cost, and high impurity content in products, and achieve the effects of high purity, convenient operation, and realization of recycling
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Embodiment 1
[0041] Add 300g of ammonium polyvanadate to 3L of 60g / L sodium hydroxide solution, heat to maintain the reaction temperature at about 85°C and stir for 2 hours. At this time, the pH value of the solution after the reaction is 10.67; the solution after the reaction is allowed to stand 30h, pour out the supernatant, add 1L of ethanol to the supernatant while stirring, let it stand for 30min, filter with suction, wash the filter cake three times with 300ml of 30% ethanol solution and drain it; Sodium acid filter cake was dissolved in 1L of high-purity water to obtain a vanadium-containing solution with a vanadium concentration of 67.2g / L. Add 200g of ammonium sulfate and stir slowly at about 65°C for 2 hours to precipitate ammonium metavanadate. After standing and cooling, suction filter, and use 300ml The saturated ammonium bicarbonate solution was washed for 3 times, drained to obtain high-purity ammonium metavanadate solid; the ammonium metavanadate solid was dried, ground and ...
Embodiment 2
[0043] Add 300g of ammonium polyvanadate to 3L of 70g / L sodium hydroxide solution, heat and maintain the reaction temperature at about 90°C and stir for 2.5h. At this time, the pH value of the solution after the reaction is 11.35; Set aside for 35 hours, pour out the supernatant, add 1.5L of ethanol to the supernatant while stirring, let it stand for 45min, filter with suction, wash the filter cake three times with 400ml of 50% ethanol solution and drain it; Sodium polyvanadate filter cake was dissolved in 1.5L of high-purity water to obtain a vanadium-containing solution with a vanadium concentration of 49.3g / L. Add 300g of ammonium sulfate and stir slowly at about 50°C for 1.5h to precipitate ammonium metavanadate. Filter, wash with 400ml saturated ammonium bicarbonate solution for 3 times, and drain to obtain high-purity ammonium metavanadate solid; dry ammonium metavanadate solid, grind and pulverize, and roast at 520°C for 2 hours to obtain high-purity ammonium metavanadate ...
Embodiment 3
[0045] Add 300g of ammonium polyvanadate to 3L of 80g / L sodium hydroxide solution, heat to maintain the reaction temperature at about 95°C and stir for 3 hours. At this time, the pH of the solution after the reaction is 11.82; the solution after the reaction is allowed to stand 40h, pour out the supernatant, add 2L of ethanol to the supernatant while stirring, let it stand for 60min, filter with suction, wash the filter cake three times with 500ml of 80% ethanol solution and drain it; Sodium acid filter cake was dissolved in 2L of high-purity water to obtain a vanadium-containing solution with a vanadium concentration of 40.7g / L. Add 400g of ammonium sulfate and stir slowly at about 45°C for 1h to precipitate ammonium metavanadate. The saturated ammonium bicarbonate solution was washed for 3 times, drained to obtain high-purity ammonium metavanadate solid; the ammonium metavanadate solid was dried, ground and pulverized, and roasted at 540°C for 2.5 hours to obtain high-purity ...
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