Method for enriching platinum from deactivated alumina platinum catalyst for cogeneration of metal aluminum

Abstract

The invention discloses a method for enriching platinum from a deactivated alumina platinum catalyst for cogeneration of metal aluminum, and relates to the technical field of rare and precious metal metallurgy. The method comprises the following steps that the deactivated alumina platinum catalyst and a fluxing agent are subjected to an electrolytic reaction to obtain crude aluminum and residual electrolytes; the crude aluminum is subjected to liguation to obtain metal aluminum and residue; the residue, a part of residual electrolytes and a part of crude aluminum are jointly smelted to obtainsmelting slag and metal melt; the smelting slag returns to an aluminum electrolytic cell, and the metal melt is subjected to water quenching treatment; a water quenching product reacts with dilute acid to obtain platinum ore concentrates and an aluminum-contained solution; the aluminum-contained solution and sodium hydroxide have a reaction to obtain aluminum hydroxide and sodium salt solutions; and the aluminum hydroxide is burned to obtain aluminum oxide to return to the aluminum cell, and the sodium salt solutions are concentrated and crystallized to obtain sodium salt products. According to the method, platinum and aluminum can be recycled from the deactivated alumina platinum catalyst, the platinum recycling rate is larger than 98.0%, the aluminum recycling rate is larger than 92.0%,the platinum enrichment multiple is larger than 120 times, and the aluminum product purity is larger than 98.0%.

Description

technical field [0001] The invention relates to the technical field of metallurgy of rare and precious metals, in particular to a method for enriching platinum and co-producing metal aluminum from spent alumina platinum catalysts. Background technique [0002] Currently, methods for enriching or recovering platinum group metals from spent aluminum-based catalyst supports are as follows: [0003] Wang Ming and others introduced the use of sintering-dissolution method to dissolve the alumina matrix in the spent catalyst to enrich platinum and then recover platinum from insoluble slag in "Precious Metals", Volume 32, Issue 4, 2011. The research results show that: the waste catalyst is calcined at 600°C for 1 hour, the carbon residue is 0.54%, and the decarburization rate reaches 92.66%; the slag is prepared according to the molecular ratio of 1.2, sintered at 800°C for 2 hours, and the clinker is dissolved in hot water at 95°C for 10 minutes , One-time sintering-dissolution, t...

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Problems solved by technology

[0013] For this reason, the present invention provides a kind of method that enriches platinum to co-produce metal aluminum from exhausted aluminum oxide platinum catalyst, to solve the problem that existing exhausted aluminum-based catalyst extracts platinum group metal mainly by wet method, due to the low content of platinum group metal , a large amount of waste residue, waste liquid, etc. are produced during the extraction process, and the carrier aluminum oxide loses its due value

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