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Method for recovering platinum group metal from spent automobile catalyst

A technology of automotive catalysts and platinum group metals, applied in the direction of improving process efficiency, etc., to achieve the effects of low reduction temperature, simple process, and easy scale-up

Inactive Publication Date: 2017-11-28
KUNMING INST OF PRECIOUS METALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problems existing in the existing methods of recovering platinum group metals from exhausted automobile catalysts, and propose a method for recovering platinum group metals from exhausted automobile catalysts by low-temperature pre-reduction-induction heating furnace smelting

Method used

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  • Method for recovering platinum group metal from spent automobile catalyst

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Embodiment 1

[0013] Embodiment 1, see attached figure 1 , finely ground (-0.074mm) 200g spent autocatalyst (SiO 2 33.6%, Al 2 o 3 30.3%, MgO 8.2%, Pt 221.3g / t, Pd 2259.2g / t, Rh 239.4g / t) mixed with 400g iron oxide and 50g coke powder, made into agglomerates, pre-reduced in a resistance furnace, reduced The temperature is 1000°C, the holding time is 40min, the reduction product is mixed with 60g of lime and 20g of borax and put into a crucible, placed in an intermediate frequency induction furnace for smelting for 80min, left to stand, and after cooling, the alloy phase is separated from the slag phase to obtain platinum group metals -ferroalloy. The contents of platinum, palladium and rhodium were respectively 3.1g / t, 8.7g / t and 3.8g / t in the slag sample analysis, and the recovery rates of platinum, palladium and rhodium were 97.9%, 99.2% and 97.6% respectively, and the platinum, palladium and rhodium The overall recovery was greater than 98%.

Embodiment 2

[0014] Embodiment 2, see attached figure 1 , finely ground (-0.074mm) 200g spent autocatalyst (SiO 2 33.6%, Al 2 o 3 30.3%, MgO 8.2%, Pt 221.3g / t, Pd 2259.2g / t, Rh 239.4g / t) mixed with 400g copper oxide and 40g coke powder, made into agglomerates, pre-reduced in a resistance furnace, reduced The temperature is 900°C, the holding time is 30 minutes, the reduction product is mixed with 60g of lime and 20g of borax and put into a crucible, placed in an induction furnace for smelting for 90 minutes, standing still, and after cooling, the alloy phase and slag phase are separated to obtain platinum group metals - copper alloy. The contents of platinum, palladium and rhodium were respectively 2.8g / t, 6.5g / t, and 3.2g / t in the slag sample analysis, and the recovery rates of platinum, palladium, and rhodium were 98.1%, 99.6%, and 98.0%, respectively. The overall recovery was greater than 98%.

Embodiment 3

[0015] Embodiment 3, see attached figure 1 , finely ground (-0.074mm) 200g spent autocatalyst (SiO 2 33.6%, Al 2 o 3 30.3%, MgO 8.2%, Pt 221.3g / t, Pd 2259.2g / t, Rh 239.4g / t) mixed with 500g iron oxide and 60g coke powder, made into agglomerates, pre-reduced in a resistance furnace, reduced The temperature is 1050°C, the holding time is 30 minutes, the reduction product is mixed with 80g of lime and 20g of borax and put into a crucible, placed in a high-frequency furnace for induction melting for 100 minutes, left to stand, and after cooling, the alloy phase and the slag phase are separated to obtain the platinum group Metal - iron alloy. The contents of platinum, palladium and rhodium were respectively 3.0g / t, 7.9g / t, and 3.6g / t in the slag sample analysis, and the recovery rates of platinum, palladium, and rhodium were 98.0%, 99.5%, and 97.8%, respectively. The overall recovery was greater than 98%.

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Abstract

The invention discloses a method for recovering platinum group metal from a spent automobile catalyst. The method comprises steps as follows: the fine-ground spent automobile catalyst, a metal oxide collector and a reducing agent are proportionally mixed, block mass is prepared from a mixture and subjected to prereduction in a resistance furnace, the metal oxide collector is reduced to a metallic state, reduced products and a slag forming constituent are proportionally mixed, put in a crucible and smelted by an induction heating furnace, an alloy is formed by collected metal and platinum group metal in the spent automobile catalyst, slag is formed by a spent automobile catalyst carrier and the slag forming constituent, a metal phase and a slag phase are enabled to be separated, a platinum group metal-collected metal alloy is obtained, and recovery of the platinum group metal is realized, wherein overall recovery rate of platinum, palladium and rhodium is higher than 98%. The platinum group metal is recovered with a low temperature prereduction-induction furnace smelting technology, and the technology is simple, environment-friendly and easy to implement; meanwhile, the formed platinum group metal-collected metal alloy contains no silicon, and therefore, follow-up refining and purification of the platinum group metal are facilitated.

Description

technical field [0001] The invention relates to a method for recovering platinum group metals, a method for recovering platinum group metals from exhausted automobile catalysts. Background technique [0002] my country's platinum group metal mineral resources are very poor, and the prospective reserves are less than 350 tons. At present, my country is in a period of rapid economic development, and the consumption of platinum group metals is increasing year by year. It has become the world's largest consumer of platinum group metals. In 2012, my country's annual demand for platinum group metals reached about 140 tons, accounting for about 20% of the world's total. As the service life of catalysts reaches its end of life and vehicles are scrapped, a large number of exhaust gas purification catalysts are produced, which become important secondary resources of platinum group metals. According to statistics, the spent catalysts replaced every year in my country contain 25-40 ton...

Claims

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Application Information

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IPC IPC(8): C22B11/02C22B7/00
CPCC22B7/001C22B11/026Y02P10/20
Inventor 董海刚赵家春保思敏崔浩童伟锋杨海琼吴跃东王亚雄吴晓峰
Owner KUNMING INST OF PRECIOUS METALS
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