Technology for recovering platinum, palladium and rhodium from spent auto-catalyst

Abstract

A technology for recovering platinum, palladium and rhodium from a spent auto-catalyst comprises the following steps: pre-processing, enriching, removing impurities, separating, and purifying to obtain relevant platinum, palladium and rhodium products. The technology has the following advantages: environment protection in the whole flow from preprocessing to enriched platinum, palladium and rhodium separation and purification and product discharge is good; the technology has good process continuity, simple flow, and high platinum, palladium and rhodium separation and purification efficiency; and in the recovery process, the direct recovery rate of platinum is not lower than 91%, and the direct recovery rate of palladium is not lower than 95%.

Description

technical field [0001] The invention belongs to the technical field of metal material extraction, in particular to a process for recovering platinum, palladium and rhodium from exhausted automobile catalysts. Background technique [0002] The three elements of platinum, palladium and rhodium (hereinafter referred to as platinum group metals) have unique physical and chemical properties, and are widely used in aviation, aerospace, navigation, missiles, rockets, atomic energy, microelectronics technology, chemical industry, petrochemical industry, glass fiber, Exhaust gas purification and metallurgical industry are widely used in various fields, and have become important materials in modern industry, military industry and high-tech industries, known as "modern industrial vitamins". [0003] In recent years, the consumption of platinum group metals in my country has continued to grow rapidly, from a few tons in the past to dozens of tons at present. However, my country's plati...

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Problems solved by technology

[0009] For overcoming above defect, the beneficial effect of a kind of technology that reclaims platinum palladium rhodium from exhausted automobile catalyst of the present invention is: effectively solve the problem that the leaching rate of invalidated automobile catalyst wet process is low, the leaching slag content is high, needs further extraction, greatly Reduce production costs and improve recovery efficiency; avoid the problem of a large amount of nitrogen oxides that are seriously polluted by the traditional sodium nitrite complexation method; the platinum-palladium solution obtained after rhodium precipitation uses ammonia ammonium chloride to work together to achieve good separation of platinum and palladium. High production efficiency and high direct yield; the separation of platinum, palladium and rhodium adopts the process of separating rhodium first and then simultaneously separating platinum and palladium. Increased production efficiency to the greatest extent and reduced production labor and reagent costs

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