Method for extracting precious metals from dead catalysts containing precious metals

A waste catalyst and precious metal technology, which is applied in the field of extracting metals from waste catalysts, can solve the problems of complex tail liquid treatment process, high solution ion concentration, high energy consumption of pyrotechnic recovery, and achieve less impurities, strong selectivity, and easy operation. easy effect

Active Publication Date: 2013-12-18
XINGUANG RECYCLING SHANGHAI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the recovery of waste metal catalysts is troubled by technology and economy. At present, the recycling rate is not high, and it is limited to a few rare and precious metals with high content and high value. There are still many difficulties in the effective recycling of spent catalysts
[0004] In addition, the current main waste catalyst recovery processes include thermal recovery and wet recovery, while thermal recovery consumes high energy and causes large pollution, while wet recovery requires high acid consumption, high solution ion concentration, and complicated tail liquid treatment process

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] This precious metal-containing waste catalyst contains the following components in weight percentage: 18% Fe, 22% Zn, 28% Pd, 22% Pt, 0.6% Mg, 0.8% Ni, 8.6% Cu, and unavoidable impurities. First, the waste catalyst containing precious metals is broken into small pieces, and then the broken pieces are ground to 3mm, washed with deionized water, and dried at 120°C for 2 hours, then put into a heat treatment furnace, and roasted at 200°C 2 hours to remove the organic matter in the spent catalyst. Add a strong acid to the roasted spent catalyst according to the solid-to-liquid ratio of 1:5, and put it into a closed high-pressure reactor for acid leaching reaction, feed oxygen to reach an oxygen partial pressure of 0.8MPa, and a temperature of 150°C. The reaction time is 2 hours. After leaching, heat filtration is carried out with hot water at 80°C, and washed three times with hot water with a solid-to-liquid ratio of 1:2 to the leach residue. Solid-liquid separation allows...

Embodiment 2

[0019] This precious metal-containing waste catalyst contains the following components in weight percentage: 32% Fe, 23.2% Zn, 18.2% Pd, 20.3% Pt, 0.3% Mg, 0.5% Ni, 5.5% Cu, and unavoidable impurities. First, the waste catalyst containing precious metals is broken into small pieces, and then the broken pieces are ground to 4mm, washed with deionized water, dried at 130°C for 1 hour, then put into a heat treatment furnace, and roasted at 250°C 2 hours to remove the organic matter in the spent catalyst. Add a strong acid to the roasted waste catalyst according to the solid-to-liquid ratio of 1:8, and put it into a closed high-pressure reactor for acid leaching reaction, feed oxygen to reach an oxygen partial pressure of 1MPa, and a temperature of 160°C. The time is 2 hours. After leaching, heat filtration is carried out with hot water at 85°C, and washed twice with hot water with a solid-to-liquid ratio of 1:3 to the leach residue. Solid-liquid separation allows precious metals...

Embodiment 3

[0021]This precious metal-containing spent catalyst contains the following components in weight percent: 24.1% Fe, 20.3% Zn, 24.1% Pd, 25.4% Pt, 0.2% Mg, 0.7% Ni, 5.2% Cu, and unavoidable impurities. First, the waste catalyst containing precious metals is broken into small pieces, and then the broken pieces are ground to 5mm, washed with deionized water, dried at 140°C for 1 hour, then put into a heat treatment furnace, and roasted at 300°C for 1 hour to remove organic matter from the spent catalyst. Add strong acid to the spent catalyst after the calcination according to the solid-to-liquid ratio of 1:10, and put it into a closed high-pressure reactor for acid leaching reaction, feed oxygen to reach an oxygen partial pressure of 1.2MPa, and a temperature of 180°C. The reaction time is 1 hour. After leaching, heat filtration is carried out with hot water at 90°C, and washed twice with hot water with a solid-to-liquid ratio of 1:4 to the leach residue. Solid-liquid separation ...

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Abstract

The invention provides a method for extracting precious metals from dead catalysts containing the precious metals. The method comprises a pretreatment step, an oxygen pressure acid leaching step, a precious metal separation step and a palladium powder and platinum powder recovery step. The method can be used for removing base metals and heavy metal elements in the dead catalysts by combining the acid pressure leaching process and the precious metal enrichment process and has the characteristics of strong selectivity for the precious metal elements in a reaction process, high recovery rate, simplicity and convenience in operation, low energy consumption and the like. The yielded precious metal nanopowder contains few impurities, has high quality and can serve as products to be directly applied to the fields such as catalysts and medicines.

Description

technical field [0001] The invention relates to the field of extracting metals from waste catalysts, in particular to a method for extracting nanometer precious metal powder from waste catalysts containing precious metals. Background technique [0002] At present, there are about 2-2.5 million tons of waste catalysts produced and used by various industries in the world every year, and these catalysts themselves consume a lot of manpower and material resources in the manufacturing process. Among them, as far as metal raw materials are concerned, a large amount of precious metals, non-ferrous metals or their oxides are mainly consumed. In the catalyst, the content of valuable metals is not lower than that of the corresponding metals in the ore, and, due to the influence of the manufacturing process, the enrichment of some metals is even higher than that of ores in nature. Therefore, governments and companies around the world have long paid attention to the recycling of waste ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B11/00
CPCY02P10/20
Inventor 罗治
Owner XINGUANG RECYCLING SHANGHAI
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