Method for preparing sodium metavanadate
A technology of sodium metavanadate and sodium polyvanadate, which is applied in the fields of chemical instruments and methods, vanadium compounds, inorganic chemistry, etc., can solve the problems of high production cost and high price, and achieve fewer types of raw materials, simple process operation, and convenient The effect of industrial production
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[0022] According to the method for preparing sodium metavanadate of the present invention, the pH value of the sodiumized vanadium extraction leaching solution is adjusted to 1.1-1.6 with an inorganic acid, and then heated to 90°C to a boiling state for 60-90 minutes, which can hydrolyze and precipitate vanadium The rate is over 99.5%. During the heat preservation process, in order to ensure that the reaction proceeds more fully, an inorganic acid can be added to the reactant to maintain the pH at 1.1-1.6.
[0023] If the pH value is less than 1.1, not only the acid consumption increases, but vanadium is easily converted into dissolved VO 2 + Cation, vanadium precipitation rate decreased significantly. If the pH value is greater than 1.6, the solubility of polyvanadate ions will increase and the vanadium precipitation rate will decrease significantly. The inorganic acid can be selected from at least one of sulfuric acid, hydrochloric acid, nitric acid and the like. The concentr...
Example Embodiment
[0031] Example 1
[0032] Take 500mL sodiumized vanadium leaching solution (V 5+ The concentration is 29.23g / L, Na + The concentration is 16.2g / L, Cr 6+ The concentration is 1.1g / L, the Si element concentration is 0.7g / L, and the P element concentration is 0.01g / L). Use 98% concentrated sulfuric acid to adjust the pH value of the sodiumized vanadium leaching solution to 1.1, and then adjust it Heat to 90°C, stir well, add 98% concentrated sulfuric acid during the heat preservation period to keep the pH at 1.1, keep at 90°C for 60 minutes, filter out the hydrolyzed solid (sodium polyvanadate), and wash quickly to obtain Sodium polyvanadate crystals. Place the obtained sodium polyvanadate crystals in a reactor, and gradually add a 40% sodium hydroxide solution to it and stir it thoroughly so that the pH of the solution in the solid-liquid mixture is 8 (after gradually adding sodium hydroxide solution During the process, the pH value of the solution in the solid-liquid mixture cont...
Example Embodiment
[0037] Example 2
[0038] Take 500mL sodiumized vanadium leaching solution (V 5+ The concentration is 21.5g / L, Na + The concentration is 18.9g / L, Cr 6+ The concentration is 1.34g / L, the Si element concentration is 0.78g / L, and the P element concentration is 0.04g / L). Use 98% concentrated sulfuric acid to adjust the pH value of the sodiumized vanadium leaching solution to 1.3, and then adjust it Heat to 95°C, stir well, add 98% concentrated sulfuric acid during the heat preservation period to keep the pH at 1.3, keep at 95°C for 70 minutes, filter out the hydrolyzed solid (sodium polyvanadate), and wash quickly to obtain Sodium polyvanadate crystals. Place the obtained sodium polyvanadate crystals in a reactor, and gradually add 50% sodium hydroxide solution to it and stir well, so that the pH of the solution in the solid-liquid mixture is 8 (after gradually adding sodium hydroxide solution During the process, the pH value of the solution in the solid-liquid mixture continues to...
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