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Method for precipitating vanadium from high vanadium and high sodium solution

A high-vanadium-high-sodium solution technology, which is applied in the field of metallurgy, can solve the problems of affecting the purity of vanadium pentoxide, easily forming sodium polyvanadate, and increasing production costs, so as to achieve the goal of not easily sinking waste, good product quality, and low waste water generation. less effect

Active Publication Date: 2018-10-19
PANGANG GRP PANZHIHUA STEEL & VANADIUM
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Problems solved by technology

Generally, the traditional vanadium precipitation method is suitable for vanadium solutions with a vanadium concentration lower than 35g / L
The lower the concentration of vanadium, the greater the amount of wastewater generated per unit of product, which not only increases production costs, but also increases environmental risks
For high-concentration vanadium solutions, especially vanadium solutions with high vanadium and high sodium, traditional methods are used to precipitate vanadium. Due to the high concentration of sodium and vanadium, hydrolysis of vanadium is easy to occur, and the hydrolyzed products of vanadium are obtained, which is difficult to separate from solid and liquid. , and the combination of sodium and vanadium is fast, it is very easy to generate sodium polyvanadate, which affects the purity of the product vanadium pentoxide

Method used

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  • Method for precipitating vanadium from high vanadium and high sodium solution

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Effect test

Embodiment 1

[0040] The vanadium solution with pH value of 10.3, vanadium concentration of 95.1g / L and sodium concentration of 58g / L was heated to 80°C. Ammonium sulfate is prepared into saturated ammonium sulfate solution with vanadium precipitation wastewater as the vanadium precipitation agent solution. to 25m 3 Add 5m of vanadium precipitation wastewater with a pH value of 2.5 in the vanadium precipitation tank 3 , add the vanadium solution and the vanadium precipitation agent solution into the vanadium precipitation tank at the same time according to the ratio of the ammonium addition coefficient for vanadium precipitation. During the process of vanadium precipitation, the pH value of the solution is continuously adjusted to 2.0-3.0, and a total of 15m vanadium solution is added. 3 , after the precipitation of vanadium is finished, the concentration of vanadium in the upper layer is 0.18g / L, and the precipitate ammonium polyvanadate (APV) is calcined to obtain vanadium pentoxide, and...

Embodiment 2

[0042] The vanadium solution with a pH value of 9.8, a vanadium concentration of 72g / L, and a sodium concentration of 46g / L was adjusted to a pH value of 7.5 with sulfuric acid, and heated to 85°C. Ammonium sulfate is prepared into saturated ammonium sulfate solution with vanadium precipitation wastewater as the vanadium precipitation agent solution. to 25m 3 Add 5m of vanadium precipitation wastewater with a pH value of 2.5 in the vanadium precipitation tank 3 , add the vanadium solution and the vanadium precipitation agent solution into the vanadium precipitation tank at the same time according to the ratio of the ammonium addition coefficient for vanadium precipitation. During the process of vanadium precipitation, the pH value of the solution is continuously adjusted to 2.0-3.0, and a total of 15m vanadium solution is added. 3 , after vanadium precipitation, the concentration of vanadium in the upper layer is 0.16g / L, APV is calcined to obtain vanadium pentoxide, and its ...

Embodiment 3

[0044] The vanadium solution with a pH value of 9.5, a vanadium concentration of 45.6 g / L, and a sodium concentration of 32 g / L was adjusted to a pH value of 7.0 with sulfuric acid, and heated to 75°C. Ammonium sulfate is prepared into saturated ammonium sulfate solution with vanadium precipitation wastewater as the vanadium precipitation agent solution. to 25m 3 Add 5m of vanadium precipitation wastewater with a pH value of 2.5 in the vanadium precipitation tank 3 , add the vanadium solution and the vanadium precipitation agent solution into the vanadium precipitation tank at the same time according to the ratio of the ammonium addition coefficient for vanadium precipitation. During the process of vanadium precipitation, the pH value of the solution is continuously adjusted to 2.0-3.0, and a total of 15m vanadium solution is added. 3 , after vanadium precipitation, the concentration of vanadium in the upper layer is 0.10g / L, APV is calcined to obtain vanadium pentoxide, and ...

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Abstract

The invention relates to a method for precipitating vanadium from a high-vanadium high-sodium solution, belonging to the technical field of metallurgy. The invention aims at providing a method for precipitating vanadium from a high-vanadium high-sodium solution. The method comprises the following steps: preheating the high-vanadium high-sodium solution; mixing with water, a vanadium precipitator solution and a pH regulator for vanadium precipitation; after the vanadium precipitation, performing solid-liquid separation of the mixed liquid, wherein the liquid is vanadium precipitation wastewater; and washing the solid and calcining to obtain vanadium pentoxide. Compared with prior art, in the invention, the high-vanadium high-sodium solution is adopted for precipitation, the technology is simple, the wastewater yield is low, and the production cost is reduced; and moreover, the reaction conditions are mild, waste is not easily precipitated, the product quality is good, the vanadium concentration in the supernate after vanadium precipitation is low, and the vanadium yield is high.

Description

technical field [0001] The invention relates to a method for precipitating vanadium from a high vanadium and high sodium solution, belonging to the technical field of metallurgy. Background technique [0002] The main purpose of vanadium precipitation is to separate the target element V from impurities such as Na from the vanadium-containing solution, and form a substance that is easy for further processing. According to the different precipitants used, it is divided into calcium salt precipitation, iron salt precipitation, hydrolysis precipitation, ammonium salt precipitation, etc.; depending on the pH value of the solution during precipitation, the ammonium salt precipitation method is divided into weakly alkaline ammonium salt precipitation method, weak Acidic ammonium salt precipitation method, acidic ammonium salt precipitation method, etc. Among them, acidic ammonium salt precipitation method is the most widely used. [0003] The traditional acidic ammonium salt vanad...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B34/22C22B3/44
CPCC22B3/44C22B34/22Y02P10/20
Inventor 刘学文王小江冉俊王永钢彭一村吴封
Owner PANGANG GRP PANZHIHUA STEEL & VANADIUM