Method for recycling vanadium from vanadium-containing electrolysis aluminum slag ash

Abstract

The invention relates to a method for recyclingvanadium from vanadium-containing aluminum slag ash. The method comprises the following steps: first, purifying the aluminum slag ash, removing or converting soluble salts and aluminum nitride which are contained in the aluminum slag ash; then mixing the purified aluminum slag ash and sodium carbonate uniformly in a certain ratio, calcining the mixture for 60min at 900DEG C to obtain a clinker, leaching the clinker in a hot water of 80 DEG C, firstly precipitating the vanadium in the clinker through use of a calcium oxide emulsion or a barium hydroxide solution; in a hot solution containing a moderate amount of the sodium carbonate and a small amount of sodium hydroxide, stirring a vanadium-precipitating slag enriched with the vanadium so as to transfer the vanadium into the solution while stirring, removing impurities consisting of silicon, aluminum and phosphate step by step through respective use of a 20% hydrochloric acid, magnesium chloride and ammonia liquor, further precipitating and enriching the vanadium in the solution to obtain ammonium metavanadate through use of ammonium chloride. The method has the advantages of good comprehensive utilization of the aluminum slag ash, an ideal effect on recycling of the vanadium in the vanadium-containing aluminum slag ash, environment friendliness, and certain economic efficiency.

Description

technical field [0001] The invention belongs to the field of chemical beneficiation and secondary resource utilization, and in particular relates to a method for recovering vanadium metal oxide from the by-product vanadium-containing aluminum slag ash produced during the electrolytic production of primary aluminum in an electrolytic aluminum plant. Background technique [0002] Since the reform and opening up, China's aluminum industry has made great progress and has become a major country in the world's aluminum industry. It has formed a relatively complete industrial system integrating bauxite, alumina, electrolytic aluminum, aluminum processing, and aluminum alloy research and development. At present, my country has become the largest producer of primary aluminum. According to the "Statistical Bulletin of the People's Republic of China on National Economic and Social Development in 2011" issued by the National Bureau of Statistics, China's electrolytic aluminum output in 2...

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Problems solved by technology

[0007] The technical problem to be solved by the present invention is: in order to overcome the problem that aluminum and vanadium cannot be efficiently separated in the prior art, a method for recovering vanadium from vanadium-containing electrolytic aluminum slag ash is provided, which is a method for ensuring efficient separation of aluminum and vanadium On the basis of the method for preparing qualified ammonium metavanadate

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