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Method for preparing ammonium polyvanadate from high-concentration vanadium liquid

An ammonium polyvanadate, high-concentration technology, applied in chemical instruments and methods, vanadium oxide, vanadium compounds, etc., can solve the problems of vanadium precipitation from low-concentration vanadium solution, long process route, low production cost, etc., and achieve the vanadium precipitation rate. High, simple process, improved work efficiency

Active Publication Date: 2017-10-24
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of the above-mentioned problems in the prior art that only low-concentration vanadium liquid can be used for vanadium precipitation, the process route is long, and the production cost is high, the purpose of the present invention is to provide a high-concentration vanadium liquid vanadium precipitation solution with low production cost and high vanadium precipitation efficiency. method

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Embodiment 1 prepares ammonium polyvanadate with technical scheme of the present invention

[0034] The main chemical components of the reaction raw materials in Example 1 are shown in Table 1 below.

[0035] The main chemical composition of table 1 reaction raw material

[0036] materials

[0037] Take 267mL of high-concentration vanadium solution (TV=60.00g / L), raise the temperature to 75°C, adjust the pH to 7.30, and add ammonium sulfate according to the ammonium addition coefficient of 1.0; take 133mL of the supernatant, raise the temperature to 85°C, and add polyvanadate Ammonium powder 2.88g, adjust the pH to 2.30; use a peristaltic pump to gradually add high-concentration vanadium solution to the supernatant, and the dropping time is 14 minutes. After the dropping, continue to stir and react for 5 minutes, then filter and wash to obtain ammonium polyvanadate 34.32g, the vanadium deposition rate is 99.57%, the TV in ammonium polyvanadate is 50.40%, Na ...

Embodiment 2

[0038] Embodiment 2 prepares ammonium polyvanadate with technical scheme of the present invention

[0039] The main chemical components of the reaction raw materials in Example 2 are shown in Table 2 below.

[0040] The main chemical composition of table 2 reaction raw material

[0041] materials

[0042] Take 350mL of high-concentration vanadium solution (TV=68.55g / L), raise the temperature to 75°C, adjust the pH to 7.30, and add ammonium chloride according to the ammonium addition coefficient 1.2; take 50mL of water, raise the temperature to 85°C, and add vanadium pentoxide powder 4.80g, adjust the pH to 2.30; use a peristaltic pump to gradually add high-concentration vanadium liquid to the aqueous solution for 18 minutes, continue to stir and react for 10 minutes after the dropwise addition, then filter and wash to obtain 50.61g of ammonium polyvanadate, The vanadium precipitation rate is 99.63%, TV in ammonium polyvanadate is 50.41%, Na 2 O+K 2 O is 0.093%, an...

Embodiment 3

[0043] Embodiment 3 prepares ammonium polyvanadate with technical scheme of the present invention

[0044] The main chemical components of the reaction raw materials in Example 3 are shown in Table 3 below.

[0045] The main chemical composition of table 3 reaction raw material

[0046] materials

[0047] Take 328mL of high-concentration vanadium solution (TV=97.32g / L), raise the temperature to 75°C, adjust the pH to 7.30, and add ammonium sulfate according to the ammonium addition coefficient of 0.80; take 72mL of the supernatant, raise the temperature to 85°C, and add metavanadic acid Ammonium powder 6.40g, adjust the pH to 2.30; use a peristaltic pump to gradually add high-concentration vanadium solution to the supernatant, and the dropping time is 20 minutes. After the dropping, continue to stir and react for 30 minutes, then filter and wash to obtain ammonium polyvanadate 67.38g, the rate of vanadium precipitation is 99.42%, TV in ammonium polyvanadate is 50.25...

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Abstract

The invention belongs to the field of chemical industry, and in particular relates to a method for preparing ammonium polyvanadate from high-concentration vanadium liquid. Aiming at the problems that the existing technology can only deposit vanadium in low-concentration vanadium liquid, the process route is long, and the production cost is high, the present invention provides a method for depositing vanadium in high-concentration vanadium liquid with low production cost and high vanadium deposition efficiency, and adjusts high-concentration vanadium liquid After reaching a suitable temperature and pH value, ammonium salt is added, and then slowly added to a solution containing vanadium-containing powder material for reaction, and ammonium polyvanadate is obtained at the end of the reaction. The technical scheme of the invention effectively solves the problem of vanadium precipitation in high-concentration vanadium liquid, and can increase the total vanadium content in the vanadium precipitation liquid to 40-110g / L. The invention has simple process, high vanadium precipitation rate, and low impurity content in the product Compared with the existing acidic ammonium salt vanadium precipitation process, the volume of vanadium precipitation wastewater can be reduced by more than 50% / t V2O5, the operating efficiency can be greatly improved, and the effect of reducing production costs is obvious.

Description

technical field [0001] The invention belongs to the field of chemical industry, and in particular relates to a method for preparing ammonium polyvanadate from high-concentration vanadium liquid. Background technique [0002] At present, the acidic ammonium salt vanadium precipitation process is mainly used to recover vanadium from sodium vanadium solution, which is widely used at home and abroad because of its advantages such as fast vanadium precipitation, high product purity, high vanadium precipitation rate, and low ammonium salt consumption. The main disadvantages and limitations of acidic ammonium salt vanadium precipitation are as follows. The main reason is that the concentration of vanadium precipitation is limited by the concentration of sodium sulfate in the solution. Vanadium and sodium in the solution exist in a certain proportion. During the pH adjustment process, it is easy to Precipitation such as hydrolyzate or heteropoly acid is produced, there are many prec...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G31/00C01G31/02
CPCC01G31/00C01G31/02C01P2006/80
Inventor 郭继科彭一村付自碧王英黄可行殷兆迁刘学文蒋霖冉俊王俊潘少彦
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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