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Method for recycling silver and rhenium from invalid ethylene oxide catalyst

A technology of ethylene oxide catalyst and deionized water, which is applied in the direction of improving process efficiency, can solve the problems of high value and must be recycled, and achieves the effects of high recovery rate, clean production process and improved leaching rate.

Active Publication Date: 2017-08-11
GUIYAN RESOURCE YIMEN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The service life of the silver catalyst is about 3 years, and the spent silver catalyst contains precious metal silver and rare metal rhenium, which is expensive and must be recycled
[0005] There are many literatures on the comprehensive recovery of precious metal silver from spent silver catalysts, but there are few literatures on the recovery of rare metal rhenium from silver catalysts

Method used

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  • Method for recycling silver and rhenium from invalid ethylene oxide catalyst

Examples

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Comparison scheme
Effect test

Embodiment 1

[0035] Such as figure 1 Shown, the method for reclaiming silver and rhenium from spent oxirane catalyst, carries out successively according to the following steps:

[0036] A, ball milling: put the spent ethylene oxide catalyst into a ball mill and grind it into particles with a particle size of 80 mesh;

[0037] B. Activation: Put the invalid ethylene oxide catalyst particles obtained in step A into a titanium reactor, add deionized water, the liquid-solid ratio of deionized water to the invalid ethylene oxide catalyst particles is 2:1, and the liquid The solid ratio is the mass ratio. Stir at a stirring speed of 50 rpm, heat to 50°C, adjust the pH value of the solution to 9 with 5% sodium hydroxide solution, and start adding analytically pure hydrogen peroxide dropwise. The amount of hydrogen peroxide added is invalid. 3% of the mass of the ethylene oxide catalyst, and the reaction time is 60 minutes; the silver and rhenium in the invalid ethylene oxide catalyst will be wra...

Embodiment 2

[0045] The method for reclaiming silver and rhenium from spent oxirane catalyst, carries out successively according to the following steps:

[0046] A, ball milling: Put the spent ethylene oxide catalyst into a ball mill and grind it into particles with a particle size of 120 mesh;

[0047] B. Activation: Put the invalid ethylene oxide catalyst particles obtained in step A into a titanium reactor, add deionized water, the liquid-solid ratio of deionized water to the invalid ethylene oxide catalyst particles is 3:1, and the liquid The solid ratio is the mass ratio. Stir at a stirring speed of 75 rpm, heat to 60°C, adjust the pH value of the solution to 10.5 with 8% sodium hydroxide solution, and start adding analytically pure hydrogen peroxide dropwise. The amount of hydrogen peroxide added is invalid. The mass of the ethylene oxide catalyst is 5.5%, and the reaction time is 120 minutes; the silver and rhenium in the invalid ethylene oxide catalyst will be wrapped by various ad...

Embodiment 3

[0055] The method for reclaiming silver and rhenium from spent oxirane catalyst, carries out successively according to the following steps:

[0056] A, ball milling: Put the spent ethylene oxide catalyst into a ball mill and grind it into particles with a particle size of 160 mesh;

[0057] B. Activation: Put the invalid ethylene oxide catalyst particles obtained in step A into a titanium reactor, add deionized water, the liquid-solid ratio of deionized water to the invalid ethylene oxide catalyst particles is 4:1, and the liquid The solid ratio is the mass ratio. Stir at a stirring speed of 100 rpm, heat to 70°C, adjust the pH value of the solution to 12 with 10% sodium hydroxide solution, and start adding analytically pure hydrogen peroxide dropwise. The amount of hydrogen peroxide added is invalid. 8% of the mass of the ethylene oxide catalyst, and the reaction time is 180 minutes; the silver and rhenium in the invalid ethylene oxide catalyst will be wrapped by various addi...

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Abstract

The invention relates to the field of precious metal secondary resource comprehensive recovery and utilization and particularly relates to a method for recycling silver and rhenium from an invalid ethylene oxide catalyst. The method for recycling the silver and the rhenium from the invalid ethylene oxide catalyst comprises the following steps of (1), ball milling; (2), activation; (3), filtering; (4), dissolution with nitric acid; (5), washing and filtering; (6), adsorption and enrichment of rhenium with a silicon functional material; (7), electro-deposition of the silver. The recovery rate of the precious metal silver is higher than 99.6%, and the recovery rate of the silver is high; purity of a silver product reaches 99.99%, and silver quality is high; the rhenium is selectively adsorbed with the silicon functional material in a nitric acid dissolving solution and is enriched on the silicon functional material, and the recovery rate of the rhenium is higher than 85%; electro-deposition waste liquid is recycled, generated alpha-Al2O3 residues are inert residues, are poisonless and harmless and can be used as addition materials of building materials, the production process is clean, energy is saved, consumption is lowered, and the method is environmentally friendly.

Description

technical field [0001] The invention relates to the field of comprehensive recovery and utilization of rare and precious metal secondary resources, in particular to a method for recovering silver and rhenium from spent ethylene oxide catalysts. Background technique [0002] Ethylene glycol is mainly used to produce polyester fiber (PET), antifreeze, plastic, rubber, polyester paint, adhesive, nonionic surfactant, ethanolamine and explosives, and is also widely used as solvent, lubricant, plasticizer, etc. . Ethylene glycol is a very important organic chemical raw material. The market capacity is second only to ethylene and propylene as strategic bulk chemical basic raw materials. China is the world's largest consumer market for ethylene glycol. The actual use has exceeded 10 million tons, 70 More than 100% depend on imports. [0003] The current methods of producing ethylene glycol include petroleum route and coal-to-ethylene glycol route. Petroleum lines oxidize ethylene...

Claims

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Application Information

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IPC IPC(8): C22B7/00C22B61/00C22B11/00
CPCC22B7/006C22B11/048C22B61/00C25C1/20Y02P10/20
Inventor 贺小塘王欢吴喜龙赵雨熊庆丰李勇刘文李锟张选冬李红梅李子璇王华
Owner GUIYAN RESOURCE YIMEN
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