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Precious metal leaching agent and method of recovering precious metal in waste catalyst

A technology for waste catalysts and precious metals, which is applied in the field of recycling precious metals in waste catalysts. It can solve the problems of difficult application, strong corrosion of chlorides, and the need for oxidation conditions, and achieve the effects of less resource waste, low volatility, and simple process.

Active Publication Date: 2019-11-22
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since chlorides are highly corrosive and require oxidizing conditions, they are difficult to apply

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] The Au@AC catalyst with a loading capacity (relative to the mass of the support) of 3wt% was prepared by the method of the literature [Functional Materials, 2012, 43:222-225]. The support is columnar activated carbon with a particle size of 50 mesh and an ash content of 3.0wt. %, specific surface area 1200m 2 / g, pore volume 1.0mL / g, the catalyst is used to catalyze the oxidation reaction of ethylene glycol and becomes a spent catalyst.

[0050] After mixing 3g of ionic liquid 1-butyl-3-methylimidazole bis-nitrile amine salt with 0.5g of iodoform and 5mL of acetone, add 1g of the above-mentioned spent Au@AC catalyst, and ultrasonicate at 80°C and 260W power under the condition of visible light irradiation After 2 hours, the solid and liquid were separated, the liquid phase was the ionic liquid containing the gold complex, and the solid phase was the catalyst. The catalyst was subjected to Soxhlet extraction, the solvent was 150 mL of acetone, the extraction temperature...

Embodiment 2

[0052] Au@SiO with a loading amount (relative to the mass of the carrier) of 1wt% was prepared by the method of the literature [Petroleum Refining and Chemical Industry, 2009, 40(2): 31-35]. 2 Catalyst, whose support is columnar SiO 2 , the particle size is 50 mesh, and the specific surface area is 300m 2 / g, the pore volume is 0.7mL / g, and the catalyst is used to catalyze the reaction of cyclohexane oxidation to become a spent catalyst.

[0053] After mixing 3g of ionic liquid 1-butyl-3-methylimidazolium dinitrile amine salt with 0.5g of iodoform and 5mL of acetonitrile, add 2g of the above Au@SiO 2 The spent catalyst was subjected to ultrasonication at 100°C and visible light for 2 hours with a power of 195W, and then the solid and liquid were separated. The liquid phase was the ionic liquid containing palladium complex, and the solid phase was the catalyst. The catalyst was subjected to Soxhlet extraction, the solvent was 150 mL of acetonitrile, the extraction temperature...

Embodiment 3

[0055] The Au@ZSM-5 catalyst with a loading capacity (relative to the carrier mass) of 5wt% was prepared by the method of the literature [Acta Catalytica Sinica, 2007, 28(5): 240-245]. The carrier is a columnar ZSM-5 molecular sieve with a particle size of 50 mesh, specific surface area 300m 2 / g, the pore volume is 0.6mL / g, and the catalyst is used to catalyze the oxidation of β-ionone to become a spent catalyst.

[0056] After mixing 5g of ionic liquid 1-ethyl-3-methylimidazolium bis-nitrile amine salt with 1g of iodoform and 5mL of ethanol, add 1g of the above-mentioned Au@ZSM-5 spent catalyst, and under the condition of 90°C and visible light irradiation with 260W power After ultrasonication for 1 h, the solid and liquid were separated, the liquid phase was the ionic liquid containing the palladium complex, and the solid phase was the catalyst. The catalyst was subjected to Soxhlet extraction, the solvent was 200 mL ethanol, the extraction temperature was 50° C., and the ...

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Abstract

The invention discloses a precious metal leaching agent and a method of recovering precious metal in a waste catalyst. The precious metal leaching agent comprises ionic liquid, iodoform and a solvent.The mass ratio of the ionic liquid to the iodoform is 30:1-5:1, and volume ratio of the solvent to the ionic liquid is 10:1-1:1. Negative ions of the ionic liquid are one or more kinds of chloride ions, bromine ions, iodide ions, thiocyanide ions and dual-nitrile amine root ions, and positive ions of the ionic liquid are one or more kinds of imidazole, pyrrolidine, quaternary ammonium salt and quaternary phosphonium salt. The precious metal leaching agent has the advantages of being economical, environmentally friendly and efficient. The invention provides the method of using the precious metal leaching agent to recover the precious metal from the waste catalyst. The method is simple in technological process and little in waste and byproduct emission, can effectively conduct harmless treatment on the waste catalyst and recover the precious metal in the waste catalyst, achieves the recycling of waste resources, reduces the environmental pollution and improves the social and economic benefit.

Description

[0001] (1) Technical field [0002] The invention relates to a precious metal leaching agent and a method for recovering precious metals in spent catalysts by using the precious metal leaching agent. [0003] (2) Background technology [0004] Precious metals mainly refer to eight metal elements including gold, silver and platinum group metals (ruthenium, rhodium, palladium, osmium, iridium, platinum). Precious metals are widely used in modern industry due to their high melting point, high boiling point, low vapor pressure, anti-oxidation and corrosion resistance. With the development of industries such as petroleum, chemical industry, and environmental protection, the amount of precious metal catalysts is increasing year by year. During use, the catalyst loses its activity due to problems such as poisoning, easy structure of the carrier, and carbon accumulation, and it needs to be replaced regularly. According to statistics, about 500,000 to 700,000 tons of spent catalysts ar...

Claims

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Application Information

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IPC IPC(8): C22B11/00C22B7/00
CPCC22B7/006C22B11/048Y02P10/20
Inventor 丰枫孙嫣霞芮佳瑶李小年赵佳刘佳媚郭伶伶张群峰许孝良卢春山
Owner ZHEJIANG UNIV OF TECH
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