Comprehensive recovering and environmentally-friendly recycling method of wasted three-way catalyst

Abstract

The invention discloses a comprehensive recovering and environmentally-friendly recycling method of a wasted three-way catalyst. The method comprises the following steps: (1) collecting wasted automobile exhaust pipes containing the wasted three-way catalysts; crushing; and separating the wasted three-way catalysts and wasted iron housings; (2) incinerating the wasted three-way catalyst; and powdering; (3) extracting and melting the wasted three-way catalyst powder through an electric arc furnace in a dry manner; adding Fe serial iron block as a trapping agent; and extracting and separating platinum group metal enriched iron blocks and harmless wasted three-way catalyst carriers; (4) separating the iron blocks and platinum group metal from the platinum group metal enriched iron blocks; andseparating the platinum group metal by grades through a graded extracting and resin adsorbing type wet separation technology; and (5) refining and purifying the separated platinum group metal until the purity is more than 99.9%, thus obtaining the high-purity platinum group metal. According to the method, the precious metal recycling capacity is improved; the environmental pollution is reduced; and the environment is improved.

Description

technical field [0001] The invention relates to the technical field of recovering precious metals in waste three-way catalysts, in particular to a method for comprehensive recovery, environmental protection and recycling of waste three-way catalysts. Background technique [0002] At present, the role of platinum group metals in industry is just like our human body cannot do without vitamins, and it is also known as "industrial vitamins". Although the quantity is small, it is indispensable. Due to the unique properties of platinum group metals and the scarcity of resources, they are regarded as "strategic reserve metals" in the world, and are known as "the first high-tech metals" in the development of high-tech industries. [0003] With the advancement of science and technology, the application fields of platinum group metals are becoming wider and wider, and the consumption is increasing, so the recycling of secondary resources becomes more important. Therefore, all countri...

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Problems solved by technology

[0004] In view of the scarcity and importance of platinum group metal resources, due to the high physical and chemical stability of platinum group metals, during the use of its products, even if some of their functions are lost, the value of the metal itself is still there.

At present, the recovery and refining market of precious metal industrial catalysts and automobile exhaust catalysts in my country is still in its infancy, the market is chaotic, and the recycling and refining technology is backward. The recovery and refining process causes a lot of secondary pollution, low product purity, and serious waste of resources.

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