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Method for recovering silver and rhenium from waste ethylene oxide catalyst

A technology of waste ethylene oxide catalyst and ethylene oxide catalyst, which is applied in the direction of improving process efficiency, can solve problems such as damaged packages and complicated methods, and achieves the effects of reducing pollution, improving leaching rate and reducing emissions

Active Publication Date: 2021-10-29
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The application technology performs activation treatment before catalyst leaching, destroys the package of various additives, improves the leaching rate of silver and rhenium, the recovery rate of silver is greater than 99.6%, the recovery rate of rhenium is greater than 85%, and the residual liquid of electrodeposition is recycled. produce α-Al 2 o 3 The inert slag can be reused, the production process is clean, energy-saving and environmentally friendly, but the method is more complicated, and it needs to use electrodeposition to recover silver

Method used

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  • Method for recovering silver and rhenium from waste ethylene oxide catalyst
  • Method for recovering silver and rhenium from waste ethylene oxide catalyst
  • Method for recovering silver and rhenium from waste ethylene oxide catalyst

Examples

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Effect test

Embodiment 1

[0044] Silver and rhenium are recovered from spent ethylene oxide catalysts, comprising the following steps:

[0045] (1) Grinding: Grinding the waste ethylene oxide catalyst into 100 mesh particles;

[0046] (2) Roasting: the particles obtained in step (1) are placed in a tube furnace, and a mixture of 8vol.% monochloromethane, 10vol.% methane, 2vol.% oxygen and 80vol.% nitrogen is introduced into the furnace. Gas, heating tube furnace to 220°C, roasting for 20h;

[0047] (3) Leaching: Put the waste ethylene oxide silver catalyst roasted in step (2) in the reactor, add nitric acid with a mass fraction of 15% and hydrogen peroxide with a mass fraction of 5% according to the volume ratio of 1:0.2 The mixed solution formed, and the solid-to-liquid ratio of the waste ethylene oxide silver catalyst in the reactor to the mixed solution was 1g: 3mL, heated the reactor to 70°C, and leached for 3 hours;

[0048] (4) Filtration, washing: after step (3) leaching finishes, filter, obta...

Embodiment 2

[0055] Silver and rhenium are recovered from spent ethylene oxide catalysts, comprising the following steps:

[0056] (1) grinding: the waste ethylene oxide catalyst is ground into 300 mesh particles;

[0057] (2) Roasting: the particles obtained in step (1) are placed in a tube furnace, and a mixture of 15vol.% monochlorethylene, 12vol.% propane, 5vol.% oxygen and 68vol.% nitrogen is introduced. Gas, heating tube furnace to 600°C, roasting for 60h;

[0058] (3) Leaching: Put the waste ethylene oxide silver catalyst roasted in step (2) in the reactor, add nitric acid with a mass fraction of 30% and hydrogen peroxide with a mass fraction of 10% according to the volume ratio of 1:0.5 The mixed solution formed, and the solid-to-liquid ratio of the waste ethylene oxide silver catalyst to the mixed solution in the reactor was 1g: 4mL, heated the reactor to 90°C, and leached for 5h;

[0059] (4) Filtration, washing: after step (3) leaching finishes, filter, obtain filtrate and fil...

Embodiment 3

[0065] Silver and rhenium are recovered from spent ethylene oxide catalysts, comprising the following steps:

[0066] (1) Grinding: Grinding the waste ethylene oxide catalyst into 100 mesh particles;

[0067] (2) roasting: the particles obtained in step (1) are placed in a tube furnace, and the mixed gas of methane and ethane (wherein the volume ratio of methane and ethane is 1:1), 3vol.% oxygen and 71vol.% nitrogen mixed gas, heating tube furnace to 500 ° C, roasting 55h;

[0068] (3) Leaching: the waste ethylene oxide silver catalyst after the step (2) roasting is placed in the reactor, adding nitric acid and 10% hydrogen peroxide by mass fraction is 1: 0.5 according to the volume ratio The mixed solution formed, and the solid-to-liquid ratio of the waste ethylene oxide silver catalyst in the reactor to the mixed solution was 1g: 4mL, heated the reactor to 80°C, and leached for 5h;

[0069] (4) Filtration, washing: after step (3) leaching finishes, filter, obtain filtrate ...

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Abstract

The invention discloses a method for recovering silver and rhenium from a waste ethylene oxide catalyst, and belongs to the technical field of metal recovery. The method comprises the following steps: grinding the waste ethylene oxide catalyst; roasting obtained particles in a mixed gas environment containing chlorine alkane-alkane-oxygen-nitrogen; leaching with a mixed solution of nitric acid and hydrogen peroxide, and filtering to obtain filtrate and filter residues; precipitating the filtrate with hydrochloric acid; after the precipitation is finished, filtering, and enriching and adsorbing rhenium on the obtained filtrate by adopting an ion exchange method; and dissolving the filter residues in the ammonia water, and adding a reducing agent for reduction to obtain sponge silver. According to the method, silver and rhenium in the waste ethylene oxide catalyst are recovered, the recovery rate of rhenium is larger than 87%, and the recovery rate of silver can reach 99.7% or above; and the finally obtained filter residue aluminum oxide contains few impurities and can be reused as a carrier and other raw materials, so that the emission of waste residues is reduced.

Description

technical field [0001] The invention belongs to the technical field of metal recovery, in particular to a method for recovering silver and rhenium from waste ethylene oxide catalysts. Background technique [0002] Ethylene oxide is an important chemical intermediate, which can further produce the main consumer chemical products required in the market, such as antifreeze, pharmaceuticals, detergents, plastics and dozens of other fine chemical products. [0003] At present, the industrial production of ethylene oxide is mainly the method of direct reaction of ethylene and oxygen under the silver catalyst, and the key technology of this process is Ag / Al 2 o 3 The use of catalysts can significantly improve the production efficiency of ethylene oxide. In addition to containing a large amount of active component silver, the catalyst also contains various additives, such as rare metal rhenium. The active component silver has a mass content of 5-40%, and the rare metal rhenium ha...

Claims

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Application Information

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IPC IPC(8): C22B7/00C22B1/02C22B11/02C22B11/00C22B61/00
CPCC22B7/002C22B1/02C22B7/007C22B11/026C22B11/048C22B61/00Y02P10/20
Inventor 程道建文启星吴登峰南洋
Owner BEIJING UNIV OF CHEM TECH
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