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

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...

AI Technical Summary

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

Images