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Method for precipitating vanadium from high-aluminum vanadium-containing solution

A technology of vanadium precipitation and solution is applied in the field of hydrometallurgy, which can solve the problems of large consumption of ammonium salt and long reaction time, and achieve the effects of high vanadium precipitation rate and high purity of refined vanadium products.

Inactive Publication Date: 2014-11-05
西安西北有色地质研究院有限公司 +1
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

Weak basic ammonium salt vanadium precipitation means that when the pH is 8-9, the metavanadate in the solution reacts with the ammonium salt to form ammonium metavanadate, and the solubility decreases sharply at low temperature and crystallizes out, but there is a long reaction time, ammonium metavanadate Disadvantages such as large salt consumption

Method used

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  • Method for precipitating vanadium from high-aluminum vanadium-containing solution
  • Method for precipitating vanadium from high-aluminum vanadium-containing solution

Examples

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Effect test

Embodiment 1

[0017] 160kg of stone coal combustion fly ash (vanadium-containing fly ash) in a certain place in Shaanxi was reversed by "acid leaching-extraction-stripping" and reversed water V 2 o 5 The concentration is 42.45g / L, Al 3+ The concentration is 11.68g / L. Add ammonia water to adjust the pH value to 1.8, stir and crystallize at 20°C for 4 hours to precipitate ammonium vanadium; add sodium chlorate to the crystallization tail liquid to oxidize low-valent vanadium ions, control the potential at 1080mV, and oxidize at 60°C for 1.0h; add 25% Adjust the pH value to 2.5 with ammonia water, stir to precipitate vanadium at 93°C for 2 hours, and filter to obtain red vanadium (cake); calcinate the red vanadium cake at 550°C for 2 hours to obtain refined vanadium. See Table 1 for the rate of vanadium precipitation and the purity of refined vanadium.

Embodiment 2

[0019] 1500g of stone coal-type vanadium ore in a certain place in Chongqing was reversed by "acid leaching-extraction-stripping" and the reversed water V 2 o 5 The concentration is 70.58g / L, Al 3+ The concentration is 13.60g / L. Add ammonia water to adjust the pH value to 1.9, stir and crystallize at 10°C for 2 hours to precipitate ammonium vanadium; add sodium chlorate to the crystallization tail liquid to oxidize low-valent vanadium ions, control the potential at 1060mV, and oxidize at 60°C for 1.0h; add 25% Ammonia water was used to adjust the pH value to 2.3, the vanadium was precipitated by stirring at 94°C for 2 hours, and red vanadium was obtained by filtration; the red vanadium was calcined at 550°C for 2 hours to obtain refined vanadium. See Table 1 for the rate of vanadium precipitation and the purity of refined vanadium.

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Abstract

The invention provides a method for precipitating vanadium from a high-aluminum vanadium-containing solution. The method comprises the following steps: carrying out extraction and back extraction on a vanadium-containing acidic leaching solution so as to obtain backwater, adding ammonium hydroxide into the backwater, stirring and crystallizing so as to separate out aluminum ammonium sulfate; adding low-valence vanadium ions oxidized by sodium chlorate into a tail liquid obtained during crystallization, adding the ammonium hydroxide into an oxidized liquid, stirring and precipitating the vanadium; and drying and calcining a red cake so as to obtain a refined vanadium product. According to the method, the problems of influences of impurities Al<3+> in the backwater on the vanadium precipitating rate and the purity of the refined vanadium are solved via a process of firstly crystallizing the aluminum ammonium sulfate and then precipitating the vanadium by fully aiming at the characteristic of high content of aluminum in the backwater obtained by precipitating the vanadium from stone coal type vanadium ores or vanadium-containing coal ash, and the byproduct aluminum ammonium sulfate is obtained at the same time. The method is low in running cost, high in vanadium precipitating rate and high in refined vanadium purity, and can be widely applied to industrial production.

Description

technical field [0001] The invention belongs to the field of hydrometallurgy, and in particular relates to a method for precipitating vanadium from a solution containing high aluminum and vanadium. Background technique [0002] V in stone coal-type vanadium ore 2 o 5 When the grade is high, vanadium can be extracted directly; V 2 o 5 When the grade is less than 0.5%, priority can be given to power generation, and then vanadium can be extracted from fly ash. In order to improve the recovery rate of vanadium, high acid leaching is generally used. High acid leaching causes impurity ions in the solution (such as: Al 3+ , Fe 3+ 、K + etc.) with high concentration, extraction-stripping is usually used to purify the solution, and backwater is used for vanadium precipitation. [0003] There are mainly two processes for vanadium precipitation: hydrolysis vanadium precipitation and ammonium salt vanadium precipitation. The hydrolysis of vanadium precipitation has the disadvant...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B34/22C22B3/26C22B3/46
CPCY02P10/20
Inventor 齐建云赵笑益王明刘子延
Owner 西安西北有色地质研究院有限公司
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