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Purification method for deep silica removal of ammonium metavanadate

A technology of ammonium metavanadate and purification method, which is applied in the field of high-purity vanadium, can solve the problems of low silicon content, etc., and achieve the effects of high production efficiency, large feeding concentration and simple method

Active Publication Date: 2016-10-26
DALIAN RONGKE ENERGY STORAGE GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Some special ammonium metavanadate orders require extremely low silicon content, such as less than 20ppm. At this time, the weak alkaline flocculation precipitation method cannot meet the requirements, and it is necessary to find other methods for deep silicon removal.

Method used

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  • Purification method for deep silica removal of ammonium metavanadate
  • Purification method for deep silica removal of ammonium metavanadate
  • Purification method for deep silica removal of ammonium metavanadate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The crude ammonium metavanadate has a silicon content of 150ppm and other impurities not exceeding 150ppm. Granularity report see figure 1 .

[0029] Take 300g of the above-mentioned ammonium metavanadate, put it into 800ml water, stir and heat to 70°C, add 92.5% sulfuric acid, adjust the pH to 2.5, add acid for 10min, continue stirring for 30min, filter, the filtrate is ammonium sulfate solution, and the solid is polyvanadate Ammonium filter cake, containing 15% moisture;

[0030] Stir, add the ammonium polyvanadate filter cake to ammonia water, control the end point pH to 8, continue to stir for 30min, filter, the filtrate contains V 2 o 5 3g / L, used as a solution for converting crude ammonium metavanadate into ammonium polyvanadate; the filter cake was dried to obtain ammonium metavanadate A296g, the extraction rate of vanadium was 98.7%, and the silicon content was 35ppm.

Embodiment 2

[0037] Crude product ammonium metavanadate, with embodiment 1, silicon content is 150ppm, and other impurity is no more than 150ppm.

[0038] Take 300g of the above-mentioned ammonium metavanadate, put it into 800ml of water, stir and heat to 80°C, add 92.5% sulfuric acid, adjust the pH to 2.5, add acid for 120min, continue stirring for 5h, filter, the filtrate is ammonium sulfate solution, and the solid is polyvanadate Ammonium filter cake, containing 60% moisture;

[0039] Stir, add the ammonium polyvanadate filter cake to ammonia water, control the end point pH to 8, continue to stir for 30min, filter, the filtrate contains V 2 o 5 3.1g / L, the filter cake was dried to obtain ammonium metavanadate B with a silicon content of 20ppm.

[0040] The difference between embodiment 2 and embodiment 1 is the time of adding acid and the stirring time after adding acid, here will contrast the influence of adding time of acid on ammonium metavanadate. Moisture analysis shows that th...

Embodiment 3

[0042] Crude product ammonium metavanadate, with embodiment 1, silicon content is 150ppm, and other impurity is no more than 150ppm.

[0043] Take 500g of the above-mentioned ammonium metavanadate, put it into 800ml of water, stir and heat to 90°C, add 60% sulfuric acid, adjust the pH to 2.5, add acid for 120min, continue stirring for 5h, filter, the filtrate is ammonium sulfate solution, and the solid is polyvanadate Ammonium filter cake;

[0044] Stir, add the ammonium polyvanadate filter cake to ammonia water, control the end point pH to 8, continue to stir for 30min, filter, the filtrate contains V 2 o 5 1.7g / L, the filter cake was dried to obtain ammonium metavanadate C with a silicon content of 47ppm.

[0045] The difference between embodiment 3 and embodiment 2 is that the feeding amount of ammonium metavanadate is increased from 300g to 500g, and the silicon content of the product is higher than that of embodiment 2. This shows that the amount of feed will affect t...

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Abstract

The invention discloses a purification method for deep silica removal of ammonium metavanadate. The method comprises the following steps: (1) pouring ammonium metavanadate into water; (2) adding acid for acidification; (3) carrying out solid-liquid separation; (4) adjusting pH to 7-9 by adding ammonia water; and (5) filtering to obtain ammonium metavanadate. According to the method, caustic soda flakes are not used, wastewater is not generated, and the product is high-purity ammonium metavanadate and ammonium sulfate solution and can be recycled.

Description

technical field [0001] The invention relates to a purification method for deeply removing silicon by ammonium metavanadate, which belongs to the field of metallurgical chemistry of vanadium and also belongs to the field of high-purity vanadium. Background technique [0002] High-purity ammonium metavanadate refers to ammonium metavanadate with extremely low impurity content and high purity. It is a high-end product in the market and is mainly used in the production of catalysts and vanadium battery electrolytes. It has extremely high requirements for various impurity elements. [0003] Usually, the production method of high-purity ammonium metavanadate is to add crude ammonium metavanadate to alkali solution water to form sodium metavanadate solution, and then add ammonium salt to precipitate it to obtain ammonium metavanadate. However, this remelting method is only effective for removing impurities of some metal ions, and is ineffective for removing silicon, that is, the si...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G31/00
CPCC01G31/00C01P2004/52C01P2004/60C01P2004/61C01P2006/80
Inventor 阎成友丛林曹永强
Owner DALIAN RONGKE ENERGY STORAGE GRP CO LTD
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