Method for extracting precious metal from spent automobile catalyst by concentration smelting-wet separation process

Abstract

The invention discloses a method for extracting precious metal from a spent automobile catalyst by a concentration smelting-wet separation process, and relates to a method for extracting platinum group metal from an automobile catalyst. The method comprises the following steps of: uniformly mixing the catalyst and auxiliary materials such as a flux and the like, and concentrating the precious metal in an alloy phase by the smelting process; pulverizing the alloy phase, and selectively leaching and separating base metal by using an acidic solvent to obtain a precious metal concentrate; and refining the precious metal concentrate to obtain a precious metal product. Compared with the single wet treatment process, the method has the obvious advantages that: the reagent consumption of a unit product and pollutants are greatly reduced, the recovery rate of the precious metal is greatly improved, the process is shortened, cost is reduced, and economic and environmental benefits are obviouslyimproved.

Description

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AI Technical Summary

Benefits of technology

This new technical effect described in this patented innovation relates to an improvement on existing methods that use expensive or environmentally harmful chemical agents such as cyanide compounds (CN), lead salt solutions, etc., while reducing their cost compared to current processes. Additionally, these improvements allow for efficient reuse of resources during remolded car bodies made from them due to better recoveries rates achieved through specific techniques like selecting suitable solvents based upon factors like type of alloy being treated. Overall, this novel approach provides more effective ways to treat wasted cars containing valuable metals at low costs.

Problems solved by technology

This patented technical problem addressed in the patents relates to improving the efficient removal of valuable materials like noble metals contained within these residues produced through conventional processes involving acid etching, hydrometry, and burning off organics. Existing solutions involve expensive physical absorption techniques, including ion exchange resins, adhesive gold extraction, solid state transformation, crystal growth, liquid immersion, and dry cleaning. These current technologies require significant capital assets and laborious operations, while new developments aimed towards more economically viable options include pyrite decomposition, zinc reduction, ammonia fusion, nitrified hydrogen refining, and advanced oxal decomposers.

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