Method for purifying liquid with vanadium and method for preparing ammonium metavanadate and vanadium oxide
A technology of ammonium metavanadate and solution, which is applied in the direction of vanadium oxide, chemical instruments and methods, vanadium compounds, etc., can solve the problems of low grade of vanadium products and the concentration of vanadium solution should not be too high, and achieve low sulfur content, low ammonia nitrogen concentration, The effect of improving product quality
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[0030] The present invention also provides a method for preparing ammonium metavanadate, which comprises purifying a vanadium solution containing vanadium homopolyate ions, and adjusting the pH value of the purified vanadium-containing solution with a pH regulator to be greater than 7.5 After being less than or equal to 9, it is contacted with an ammonium precipitating agent to obtain ammonium metavanadate precipitation. It is characterized in that, the method for purifying the vanadium solution containing the vanadium-containing homopolyacid ion is the above-mentioned method for purifying the vanadium-containing solution.
[0031] The above-mentioned pH adjusting agent can be various pH adjusting agents known in the art, and the present invention is preferably one or more of liquid ammonia, ammonia water, ammonium bicarbonate and ammonium carbonate.
[0032] According to the above-mentioned preparation method of ammonium metavanadate, wherein, the ammonium precipitant can be o...
Embodiment 1
[0040] The vanadium-containing solution produced by the sodium roasting-water leaching process of 2L containing vanadium 40.46g / L, sodium 31.5g / L, potassium 0.64g / L and temperature 40°C was passed through a macroporous strong acid styrene cation with a weight of 1000g. Exchange resin (D001 macroporous strong acid styrene cation exchange resin, exchange capacity ≥ 4.35mmolH + / g, Jiangsu Linhai Resin Technology Co., Ltd.) bed, the contact exchange time between the vanadium-containing solution and the ion exchange resin is 2min, and the vanadium solution after the exchange contains 40.25g / L of vanadium, 1.23g / L of sodium, and 0.01g of potassium. / L, pH=1.05, add ammonia water to the exchanged vanadium solution to adjust pH to 7.5, then add ammonium bicarbonate to carry out vanadium precipitation, control the ammonium addition coefficient (calculated as ammonium sulfate) to be 1, and the vanadium precipitation rate is 77.2%. After filtering and washing the precipitated ammonium m...
Embodiment 2
[0044] Pass 2L of vanadium-containing solution produced by sodium roasting-water leaching process containing vanadium 45.75g / L, sodium 29.3g / L, potassium 0.61g / L and temperature 50℃ through 1000g macroporous strong acid styrene cation exchange resin (D001 macroporous strong acid styrene cation exchange resin, exchange capacity ≥ 4.35mmolH + / g, Jiangsu Linhai Resin Technology Co., Ltd.) bed, the contact exchange time between the vanadium-containing solution and the ion exchange resin is 20min, and the vanadium solution after the exchange contains 45.43g / L of vanadium, 0.51g / L of sodium, and 0.01g of potassium. / L, pH=1.03, add ammonia water to the exchanged vanadium solution to adjust pH to 8.0, then add ammonium bicarbonate to carry out vanadium precipitation, control the ammonium addition coefficient (calculated as ammonium sulfate) to be 1.2, and the vanadium precipitation rate is 92.5%. After filtering and washing the precipitated ammonium metavanadate, it is fired in an e...
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