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Method for preparing vanadyl sulfate from vanadium-containing solution

A technology of vanadyl sulfate and solution, applied in the direction of improving process efficiency, etc., can solve the problem of shortening the process flow, and achieve the effect of optimizing the extraction process, low impurity content, and high vanadium concentration

Pending Publication Date: 2021-07-30
四川星明能源环保科技有限公司
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  • Summary
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In addition, although the current extraction process can shorten the process flow, most of the products are vanadium-containing solutions, and the vanadium-containing solutions need to undergo vanadium precipitation and roasting to obtain a large amount of V 2 o 5 Products, if you want to prepare downstream vanadyl sulfate products, you need to V 2 o 5 The product is further processed, and the process flow is not significantly shortened compared with the traditional process

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Take vanadium slag sodium roasting leaching solution, in which vanadium concentration is 33.24g / L, chromium content is 1.14g / L leaching solution 300ml in a beaker, at 60 ℃, add sodium sulfite 120.6g, after stirring evenly, use sulfuric acid to adjust the pH of the solution 2; the reduction rate of vanadium is 99.89%; water is added to dilute the solution until the concentration of vanadium is 15g / L, and the pH of the solution is adjusted to 3.5 using sodium hydroxide;

[0037] Using 35% P204, 15% TBP, and 50% kerosene extractant, the saponification rate is 30%, the ratio is 1:1, the flow ratio is 1:1, the extraction is 10 stages, and the concentration of vanadium in the raffinate is 0.05g / L;

[0038] Use 0.15mol / L of H 2 SO 4 The solution is used as a pickling agent, the ratio is 2:1, the flow ratio is 1:1, pickling level 4, the content of vanadium in the organic phase after pickling is 15g / L, and the content of impurities Na, K, Ca, Si, etc. is less than 2ppm;

[003...

Embodiment 2

[0041] Take vanadium slag sodium roasting leaching solution, in which vanadium concentration is 33.24g / L, chromium content is 1.14g / L leaching solution 300ml in a beaker, at 60 ℃, add sodium metabisulfite 31g, after stirring evenly, use sulfuric acid to adjust the pH of the solution 2.5; the reduction rate of vanadium is 99.89%; adding water to dilute the solution to a vanadium concentration of 12g / L, using sodium hydroxide to adjust the pH of the solution to be 3.5;

[0042] Using 35% P204, 10% TBP, 55% kerosene extractant, the saponification rate is 10%, the ratio is 1:1, the flow ratio is 1:1, the extraction is 10 stages, and the concentration of vanadium in the raffinate is 0.04g / L;

[0043] Use 0.15mol / L of H 2 SO 4 The solution is used as a pickling agent, the ratio is 2:1, the flow ratio is 1:1, pickling level 6, the content of vanadium in the organic phase after pickling is 12g / L, and the content of impurities Na, K, Ca, Si, etc. is less than 2ppm;

[0044] Use 3mol / ...

Embodiment 3

[0046] Take the vanadium slag through sodium roasting-water immersion to obtain 300ml of leaching solution with a vanadium concentration of 44.5g / L in a beaker, add 150.6g of sodium sulfite at 60°C, stir evenly, and use sulfuric acid to adjust the pH of the solution to 2; The reduction rate is 99.89%; add water to dilute the solution until the vanadium concentration is 28g / L, and use sodium hydroxide to adjust the pH of the solution to 3.5;

[0047] Using 40% P204, 10% TBP, and 50% kerosene extractant, the ratio is 1:1, the flow ratio is 0.5:1, and the extraction is 8 stages. During the extraction process, there are serious three-phases, and the phases cannot be separated.

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Abstract

The invention discloses a method for preparing vanadyl sulfate from a vanadium-containing solution. The method comprises the following steps that S1, high-valence vanadium in the solution is reduced; S2, the vanadium content and acidity in the solution are adjusted; S3, vanadium in the solution is extracted into an organic phase; S4, vanadium reverse extraction is carried out on the vanadium-carrying organic phase by using sulfuric acid to obtain a vanadyl sulfate solution product; and S5, the organic phase is recycled after being subjected to iron and chromium reverse extraction and water washing; According to the method for preparing the vanadyl sulfate from the vanadium-containing solution, by aiming at the characteristics that vanadium is a variable valence metal and is in different states with different pH values, different potentials and different concentrations, the problem of separation of vanadium and impurities in the extraction process is effectively solved, and the effect that a vanadyl sulfate product with high vanadium concentration and low impurity content is prepared in a short process is achieved.

Description

technical field [0001] The invention relates to the technical field of preparing vanadyl sulfate, in particular to a method for preparing vanadyl sulfate from a solution containing vanadium. Background technique [0002] With the widespread application of vanadium in the field of flow batteries and alloys, the market demand for vanadium is gradually increasing. At present, the process of sodium roasting-hydrolysis vanadium precipitation-alkali dissolution-ammonium salt secondary vanadium precipitation process is the main method for vanadium extraction from vanadium-containing raw materials. However, most of the products of this process are bulk chemical products such as ammonium metavanadate or vanadium pentoxide, and the process is long. If fine chemical products are prepared, the process will be further extended. Therefore, extracting vanadium from the vanadium-containing solution is considered to be the best way to shorten the process flow. Patent CN102560115A avoids the...

Claims

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Application Information

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IPC IPC(8): C22B3/22C22B3/38C22B3/44C22B34/22
CPCC22B3/44C22B3/22C22B34/22Y02P10/20
Inventor 蒲年文刘磊付云枫张忠裕贾强方
Owner 四川星明能源环保科技有限公司
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