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

Active Publication Date: 2010-06-09
PANGANG GRP PANZHIHUA STEEL & VANADIUM +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the method for V 2 o 5 Higher purity requirements

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[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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Abstract

The invention discloses a method for preparing sodium metavanadate, which comprises the following steps: a. adjusting the pH value of a leach solution obtained by sodium treatment and vanadium extraction to 1.1-1.6 by an inorganic acid, then heating the leach solution to 90 DEG C until boiling, and keeping for 60-90 minutes to generate solid sodium polyvanadate; b. adding sodium hydroxide solution to the obtained solid sodium polyvanadate, and stirring the obtained solid-liquid mixture, so that the pH value of the solution in the solid-liquid mixture is 8-8.5; and c. heating the solid-liquid mixture to 90 DEG C until boiling to generate solid sodium metavanadate. By the method, high-purity sodium metavanadate can be prepared and the method has small consumption of alkali and low cost.

Description

technical field [0001] The present invention relates to a kind of method of preparing sodium metavanadate, more specifically, relate to a kind of method of preparing sodium metavanadate by sodium vanadium extraction leach solution. Background technique [0002] Sodium metavanadate (NaVO 3 ) is widely used in the chemical industry. It can be used as a catalyst, drier, mordant, and ammonium vanadate and potassium metavanadate. It can also be used in medical imaging, plant inoculation, and corrosion inhibitor. At present, sodium metavanadate can be extracted from vanadium-containing sodium roasting leaching solution, and there are two main methods. [0003] The first method is to evaporate, concentrate and crystallize the vanadium-extracting leaching solution after removing impurities, so as to obtain sodium metavanadate solid. The method is simple in process and convenient in operation, but the leach solution for extracting vanadium has complex components and incomplete remo...

Claims

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Application Information

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IPC IPC(8): C01G31/00
Inventor 陈亮熊仁利李千文李大标
Owner PANGANG GRP PANZHIHUA STEEL & VANADIUM
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