Extraction method for reducing vanadium in sulfuric acid leaching solution by using waste vanadium-poor catalyst

An extraction method and catalyst technology, which are applied in the field of vanadium extraction from waste-lean vanadium catalyst reduction sulfuric acid leaching solution, can solve the problems of low recovery rate of waste-lean vanadium catalyst, increase processing cost, waste of vanadium resources, etc., and achieve the recovery rate High, simple operation, environment-friendly effect

Pending Publication Date: 2022-03-11
王仕斌 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The method of the present invention is aimed at the current industry. Due to the low recycling rate of the waste-poor vanadium catalyst, the extraction is more difficult, and the cost of chemicals is higher. Few people are willing to recycle the waste-poor vanadium catalyst to extract vanadium, which leads to waste of vanadium resources. In order to solve the problem of increasing additional processing costs for enterprises, a method for extracting vanadium in sulfuric acid leaching solution reduced by spent vanadium-poor catalysts is provided

Method used

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  • Extraction method for reducing vanadium in sulfuric acid leaching solution by using waste vanadium-poor catalyst

Examples

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Embodiment 1

[0017] see figure 1 , a method for extracting vanadium in the sulfuric acid leaching solution reduced by spent vanadium-poor catalysts, comprising the following steps: adding 1000 g of 3.1% vanadium-poor catalyst-reduced sulfuric acid leaching solutions into a container, heating to 70° C. , add sodium hydroxide to it to adjust the pH of the solution to 7.5, continue to stir and react for 1 hour, the vanadyl sulfate in the solution is neutralized to form a vanadyl hydroxide precipitate, filter and wash, and add 10% sodium hydroxide to the filter residue In the solution, add hydrogen peroxide until the solution is light yellow and the pH value reaches 11, and continue to stir for 30 minutes to convert the vanadium hydroxide into sodium metavanadate into the solution, filter and wash to remove insoluble matter (the filter residue is iron oxide, discarded) , the filtrate was concentrated, crystallized, centrifuged, and dried to obtain 74.2g of sodium metavanadate product, and the ...

Embodiment 2

[0021] A method for extracting vanadium in the leach solution of sulfuric acid reduced by spent vanadium-poor catalyst, comprising the following steps: adding 1000 g of leach solution of sulfuric acid reduced by spent vanadium-poor catalyst with a vanadium mass fraction of 3.12% into a container, heating to 75° C. Add sodium hydroxide therein to adjust the pH of the solution to 7, continue to stir and react for 1.5 hours, the vanadyl sulfate in the solution is neutralized to form a vanadyl hydroxide precipitate, filter and wash, and add a mass fraction of 8% sodium hydroxide solution to the filter residue , add hydrogen peroxide until the solution is light yellow, and the pH value reaches 12, continue to stir for 30 minutes, so that the vanadium hydroxide is converted into sodium metavanadate into the solution, filter and wash to remove insoluble matter (the filter residue is iron oxide, discarded), The filtrate was concentrated, crystallized, centrifuged, and dried to obtain 7...

Embodiment 3

[0025] A method for extracting vanadium in a leach solution for reducing sulfuric acid by a spent vanadium-poor catalyst, comprising the following steps: adding 1000 g of a leach solution for reducing sulfuric acid by a spent vanadium-poor catalyst with a mass fraction of 3.09% into a container, heating to 80° C. Add sodium hydroxide therein to adjust the pH of the solution to 8, continue to stir and react for 2 hours, the vanadyl sulfate in the solution is neutralized to form a vanadyl hydroxide precipitate, filter and wash, and add a mass fraction of 12% sodium hydroxide solution to the filter residue , add hydrogen peroxide until the solution is pale yellow, and the pH value reaches 10, continue to stir for 30 minutes, so that the vanadium hydroxide is converted into sodium metavanadate into the solution, filter and wash to remove insoluble matter (the filter residue is iron oxide, discarded), The filtrate was concentrated, crystallized, centrifuged, and dried to obtain 74.1...

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Abstract

The invention discloses a method for extracting vanadium from a waste vanadium-poor catalyst reduced sulfuric acid leaching solution, which comprises the following steps of: adding the waste vanadium-poor catalyst reduced sulfuric acid leaching solution with the vanadium mass fraction of more than or equal to 3 percent into a container, heating to 70 to 80 DEG C, preserving heat, adding sodium hydroxide to adjust the pH value of the solution to 7 to 8, stirring and reacting for 1 to 2 hours, and filtering to obtain the vanadium-poor catalyst reduced sulfuric acid leaching solution. Neutralizing vanadyl sulfate in the solution to generate a vanadyl hydroxide precipitate, filtering and washing, adding filter residues into a sodium hydroxide solution with the mass fraction of 8-12%, introducing air or adding hydrogen peroxide to convert vanadyl hydroxide into a colorless or faint yellow sodium metavanadate solution with the pH value of 10-12, continuously stirring for 30 minutes, and filtering to obtain a vanadyl sulfate solution; converting the vanadyl hydroxide into sodium metavanadate to enter the solution, filtering and washing to remove insoluble substances, and concentrating, crystallizing, centrifuging and drying the filtrate to obtain a sodium metavanadate product; vanadium in the waste vanadium-poor catalyst is recycled scientifically in an environment-friendly mode, a small amount of iron oxide slag is generated, waste water and waste gas are not generated, and the method is environmentally friendly and suitable for popularization.

Description

technical field [0001] The invention relates to the technical field of vanadium recovery, in particular to a method for extracting vanadium in a sulfuric acid leaching solution reduced by a spent vanadium-poor catalyst. Background technique [0002] Vanadium and its compounds are important raw materials in the metallurgical and chemical industries, and are also widely used in machinery, construction, shipbuilding, automobiles, national defense, electronics and other industrial sectors. However, vanadium is scattered in nature, and its production and mining are mostly recovered as a by-product or recovered from vanadium-containing waste when mining and processing other metal ores. Recovery of vanadium from spent vanadium catalyst is also an important way. [0003] The vanadium content in the spent vanadium-depleted catalyst is about 2.5% (wt), while the vanadium content in the conventional spent vanadium catalyst is about 5%. It is more difficult and consumes more chemicals...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B34/22C22B7/00
CPCC22B34/225C22B7/007Y02P10/20
Inventor 王水平
Owner 王仕斌
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