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Method for recovery of precious metals in catalyst by supercritical oxidation

A technology of supercritical oxidation and precious metals, which is applied in the direction of improving process efficiency, etc., to achieve the effects of ensuring recovery rate, reducing equipment cost, and occupying a small area

Active Publication Date: 2021-05-18
廊坊新奥龙河环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a method for reclaiming precious metals by supercritical oxidation, to solve the problem in the prior art that supercritical water oxidation reaction needs to be carried out under higher pressure

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Get 100kg of mother liquor containing rhodium octanoate, wherein, mother liquor pH is 7, calorific value is 25.39MJ / kg, total sulfur 11049.19mg / L, total chlorine 997.59mg / L, total bromine 8.21mg / L, total fluorine 6.58mg / L , total phosphorus 612.42mg / L, rhodium content 187.777mg / kg, viscosity 860mPa.s, solid content 7%, particle size less than 380μm, add 0.09m 3 Methanol (refined alcohol) and 0.81m 3 The water is configured into a slurry, and the calorific value of the slurry is 4.5MJ / kg.

[0030] Heat the supercritical oxidation device to 340°C with an electric heater, pressurize the supercritical oxidation device to 19MPa with water and nitrogen, and feed 10% methanol solution into the supercritical oxidation device with a flow rate of 0.45m 3 / h, after 4 minutes and 50 seconds, oxygen is introduced for ignition, and the oxygen flow rate is 50Nm 3 / h, while adjusting the flow rate of the top quenching water pump and the high-pressure quenching water pump, continue to ...

Embodiment 2

[0034] Get 100kg of mother liquor containing rhodium octanoate, wherein, mother liquor pH is 7, calorific value is 25.39MJ / kg, total sulfur 11049.19mg / L, total chlorine 997.59mg / L, total bromine 8.21mg / L, total fluorine 6.58mg / L , total phosphorus 612.42mg / L, rhodium content 187.777mg / kg, viscosity 860mPa.s, solid content 7%, particle size less than 380μm, add 0.15m 3 Methanol (refined alcohol) and 0.75m 3 The water is configured into a slurry, and the calorific value of the slurry is 6MJ / kg.

[0035] Heat the supercritical oxidation device to 350°C with an electric heater, pressurize the supercritical oxidation device to 20MPa with water and nitrogen, and feed 10% methanol solution into the supercritical oxidation device with a flow rate of 0.45m 3 / h, after 4 minutes and 50 seconds, oxygen is introduced for ignition, and the oxygen flow rate is 50Nm 3 / h, while adjusting the flow rate of the top chilled water pump and high-pressure chilled water pump, continue to raise the...

Embodiment 3

[0039] Get 100kg of mother liquor containing rhodium octanoate, wherein, mother liquor pH is 7, calorific value is 25.39MJ / kg, total sulfur 11049.19mg / L, total chlorine 997.59mg / L, total bromine 8.21mg / L, total fluorine 6.58mg / L , total phosphorus 612.42mg / L, rhodium content 187.777mg / kg, viscosity 860mPa.s, solid content 7%, particle size less than 380μm, add 0.03m 3 Methanol (refined alcohol) and 0.87m 3 The water is configured into a slurry, and the calorific value of the slurry is 3.2MJ / kg.

[0040] Heat the supercritical oxidation device to 350°C with an electric heater, pressurize the supercritical oxidation device to 20MPa with water and nitrogen, and feed 10% methanol solution into the supercritical oxidation device with a flow rate of 0.45m 3 / h, after 4 minutes and 50 seconds, oxygen is introduced for ignition, and the oxygen flow rate is 50Nm 3 / h, while adjusting the flow rate of the top chilled water pump and high-pressure chilled water pump, continue to raise t...

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Abstract

The invention relates to a method for recovering precious metals in catalysts by supercritical oxidation, comprising: preparing the waste slurry so that its pH is 6-12 and its heat value is 3.2-6MJ / kg; and igniting a vertical reactor After the ignition is successful, the temperature in the reactor is raised to 600-650°C, the pressure is raised to 22.1-22.8MPa, and then the prepared slurry is added to the reactor for supercritical oxidation reaction; after the reaction is completed, the ash and slag are collected. Precious metals in the liquid phase. The supercritical reaction is carried out in a vertical reactor, and the reaction can be fully carried out at a relatively low pressure, effectively removing the organic components combined with the catalyst, and at the same time ensuring the recovery rate of precious metals.

Description

technical field [0001] The invention relates to the field of precious metal recovery, in particular to a method for supercritical oxidation recovery of precious metals in catalysts. Background technique [0002] Precious metals include silver, gold, and platinum group metals (platinum, palladium, osmium, iridium, ruthenium, rhodium), which are widely used in industrial catalysts because of their excellent catalytic activity. Waste catalyst resources containing precious metals are very rich. Disposal methods include fire incineration technology, and wet separation and purification technology, such as extraction method, precipitation method, oxidation distillation method, washing method, adsorption separation method, chemical activation method, etc. [0003] However, the combustion method has certain disadvantages in extracting precious metals. During ashing, precious metals are easy to volatilize, and the pollution is serious. At the same time, the liquid in the extraction an...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B7/00C22B11/00
CPCC22B7/009C22B11/00Y02P10/20
Inventor 孟郊宋成才高志远高申李宁宁张帆王涛李泷
Owner 廊坊新奥龙河环保科技有限公司
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