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Method for efficiently and cleanly recovering platinum group metals from spent automobile catalyst

An auto catalyst, platinum group metal technology, applied in the direction of improving process efficiency, can solve the problem of high technical requirements, and achieve the effects of low smelting temperature, low reaction conditions and technical requirements, and high recovery rate

Inactive Publication Date: 2014-12-03
KUNMING INST OF PRECIOUS METALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The pyrotechnic process for the treatment of automobile exhaust catalyst not only has a large processing capacity, less waste water and waste gas, but also has a high recovery rate of platinum group metals, but it also requires higher technical requirements. At present, it is still in the research and development stage in China, and there is no relevant report

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  • Method for efficiently and cleanly recovering platinum group metals from spent automobile catalyst

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Experimental program
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Effect test

Embodiment 1

[0014] Embodiment 1, see attached figure 1 , 10kg of spent automobile spent catalyst (wherein SiO 2 About 40%, Al 2 o 3 About 35%, Pt357.49g / t, Pd963.77g / t, Rh192.90g / t) and 3.4kg of copper oxide, 3.5kg of lime, 3.2kg of quartz sand, 0.8kg of borax, 0.8kg of coke powder are fully mixed, placed Smelting at 1400°C for 5 hours in an electric furnace, separating the metal phase and slag phase to obtain 2.66kg of metal phase, Pt<1g / t, Pd3.9g / t, Rh<1g / t in the smelting slag, total platinum group metals The recovery rate is greater than 99.7%; 2.66kg of the metal phase is placed in an alumina crucible, blown into air, and blown at a temperature of 1250 ° C. After the reaction is completed, the copper oxide and the metal phase (platinum group metal enrichment) are separated to obtain 65.4g of platinum group metal enrichment, 3.27kg of copper oxide was returned to the smelting process as a collector, and the recycling rate of the collector was about 96%; 65.4g of platinum group meta...

Embodiment 2

[0015] Embodiment 2, see attached figure 1 , 10kg of spent automobile spent catalyst (wherein SiO 2 About 40%, Al 2 o 3 About 35%, Pt357.49g / t, Pd963.77g / t, Rh192.90g / t) and 3.5kg of copper oxide, 3.8kg of lime, 3.0kg of quartz sand, 1kg of borax, 1kg of coke powder are fully mixed and placed in an electric furnace Melting at 1350°C for 3 hours, separating the metal phase and slag phase to obtain 2.72kg of metal phase, Pt1.2g / t, Pd2.3g / t, Rh<1g / t in the smelting slag, the recovery rate of total platinum group metals Greater than 99.5%; put 2.72kg of metal phase in an alumina crucible, blow air into it, and blow it at a temperature of 1250°C. After the reaction, separate copper oxide and metal phase (platinum group metal enrichment) to obtain 70.2g Platinum group metal enrichment, 3.33kg of copper oxide is returned to the smelting process as a trapping agent, and the recycling rate of the trapping agent is about 95%; 70.2g of platinum group metal enrichment is dissolved in a...

Embodiment 3

[0016] Embodiment 3, see attached figure 1 , 10kg of spent automobile spent catalyst (wherein SiO 2 About 40%, Al 2 o 3 About 35%, Pt357.49g / t, Pd963.77g / t, Rh192.90g / t) and 3.4kg copper oxide, 3.4kg lime, 3.6kg quartz sand, 1.0kg borax, 0.8kg coke powder are fully mixed, set Smelting at 1300°C for 5 hours in an electric furnace, separating the metal phase and slag phase to obtain 2.65kg of metal phase, Pt1.7g / t, Pd3.9g / t, Rh1g / t in the smelting slag, the recovery rate of total platinum group metals Greater than 99.4%; put 2.65kg of metal phase in an alumina crucible, blow air into it, and blow it at a temperature of 1250°C. After the reaction, separate copper oxide and metal phase (platinum group metal enrichment) to obtain 68.3g Platinum group metal enrichment, 3.27kg of copper oxide is returned to the smelting process as a trapping agent, and the recycling rate of the trapping agent is about 96%; 65.4g of platinum group metal enrichment is dissolved in aqua regia at a te...

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Abstract

The invention discloses a method for efficiently and cleanly recovering platinum group metals from a spent automobile catalyst, which comprises the following steps: (1) smelting and collection: mixing the spent automobile exhaust catalyst with a collector, a reducer and a slag former, and carrying out high-temperature smelting to obtain a collected metal-platinum group metal alloy; (2) alloy phase oxidation and converting: blowing oxidizing gas into the collected metal-platinum group metal alloy to perform converting; (3) high-grade platinum group metal enrichment dissolution and separation: carrying out oxidizing solvent dissolution and ion-exchange separation to obtain a platinum group metal solution, adding alkali into the exchange raffinate to neutralize and precipitate, and returning the precipitate as the collector for the smelting step; and (4) platinum group metal refinement: refining and purifying the platinum group metal solution to obtain the platinum group metal product. The method efficiently recovers the platinum group metals; the recovery rate of the platinum group metals is greater than 99%, and the platinum+palladium+rhodium content in the smelting slag is less than 10g / t; and the collector can be recycled, so that the method is clean and pollution-free and can easily implement industrialization.

Description

technical field [0001] The invention relates to a method for efficiently and cleanly recovering platinum group metals from exhausted automobile catalysts, in particular to a method for effectively enriching platinum group metals from exhausted automobile exhaust catalysts or secondary materials of various refractory platinum group metals. 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. According to statistics, my country's automobile production in 2011 was 18 million. With the failure of catalysts and the scrapping of automobiles, the sp...

Claims

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Application Information

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IPC IPC(8): C22B7/00C22B11/00
CPCY02P10/20
Inventor 董海刚陈家林保思敏赵家春吴跃东李博捷杨海琼童伟锋王亚雄吴晓峰
Owner KUNMING INST OF PRECIOUS METALS
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