Technique for preparing high-purity vanadium pentoxide by high-vanadium edulcoration

A high-purity vanadium pentoxide technology, which is applied in the field of high-purity vanadium pentoxide preparation from high-vanadium impurities, can solve the problems of process growth, increased vanadium loss, and increased unit consumption of intermediate raw materials, so as to improve the rate of vanadium deposition , The effect of thorough removal of impurities

Inactive Publication Date: 2008-05-21
贾绍才
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Problems solved by technology

This method increases the unit consumption of intermediate raw materials and increases the process flow. Even after two crystallizations, it is difficult to stabilize the product quality above 99.5%. In the process of repeated crystallization, it not only increases the consumption of raw materials, but also increases the loss of vanadium.

Method used

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Embodiment Construction

[0012] A high-vanadium impurity removal process for preparing high-purity vanadium pentoxide, the specific method is:

[0013] (1) Purification process: Use hydrochloric acid to pre-adjust the desorption liquid to a pH value of 8 to 9. After the purification agent aluminum sulfate is stirred and dissolved in a small mixing tank, it is pumped into the purification tank to purify the desorption liquid and remove impurities. The purification tank Stir with air. After 48 hours of air stirring, it was left to stand for 72 hours;

[0014] (2) Solid-liquid separation: The clarified mixed solution is centrifugally filtered, and the filtrate is naturally filtered by the filter tank and then sent to the ammonium precipitation tank. The purified slag in the centrifuge is washed with processing water, the washing liquid with high concentration of vanadium enters the ammonium precipitation tank, and the washing liquid with low concentration of vanadium flows into the transfer tank and the...

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Abstract

The invention relates to a preparation technology of vanadium pentoxide with high purity by removing impurity from high vanadium. The method adopts hydrochloric acid to adjust the pH value of desorbed solution to 8-9 and adopts aluminum sulfate as purifying agent; the pH value of filtrate is adjusted by the hydrochloric acid to 8-9; the obtained solution is stirred under the normal temperature and is added with ammonium chloride for reaction for 3-4 days so as to obtain ammonium metavanadate crystals which are then treated with centrifugal dewatering after settling; the ammonium metavanadate obtained after dehydration is burned under the temperature of 500-550 DEG C in an electricity calcine stove for six to eight hours and is next cooled to obtain the vanadium pentoxide with high purity. The impurity removal by the technology of the invention is more thoroughly and the vanadium precipitation rate is improved and the purity of the obtained product can reach above 99.5 percent.

Description

technical field [0001] The invention relates to a process for extracting vanadium pentoxide from vanadium ore, in particular to a process for preparing high-purity vanadium pentoxide by extracting impurities from high vanadium. Background technique [0002] In the process of extracting non-oxidized vanadium from vanadium ore, the primary product of vanadium pentoxide in the analytical solution obtained after roasting and ion exchange contains Fe 2+ , Mg 2+ , Mn 2+ 、PO 4 3- , SiO 4 2- Various impurities such as vanadium pentoxide need to be purified to obtain higher purity vanadium pentoxide products. The traditional vanadium pentoxide purification method is to adjust the pH value of the solution with NaOH under neutral or slightly alkaline conditions to make a large number of cations precipitate, and then add NH 4 Cl precipitates vanadium to generate ammonium metavanadate, and the ammonium metavanadate is recrystallized after being washed by centrifugation. This meth...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G31/02
Inventor 贾绍才田仁国
Owner 贾绍才
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