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Method for recovering noble-metal from waste catalyst

A waste catalyst and precious metal technology, which is applied in the field of recovering precious metals from waste catalysts containing precious metals, can solve the problems of difficult to completely remove carbon deposits, low recovery rate of precious metals, serious environmental pollution, etc., and achieve low cost and simple requirements for recovery devices , the effect of shortening the recycling cycle

Active Publication Date: 2007-11-21
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In these methods, waste materials containing precious metals should be treated at high temperature firstly, but for catalysts deactivated by carbon deposits, especially spent catalysts with a large amount of carbon deposits, due to the concentrated heat release and improper temperature control during the high-temperature firing process, it will It is difficult to completely remove the carbon deposit attached to the catalyst, and conventional leaching will inevitably result in a low recovery rate of precious metals; at the same time, conventional leaching with hydrogen peroxide, aqua regia, etc. is not only expensive, but also seriously pollutes the environment and is dangerous

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] 10.0g of industrial Pt / molecular sieve waste catalyst containing 0.350w% Pt was kept at 70°C for 2 hours, and the oxygen content was adjusted to 5.0v%; at 240°C for 2 hours, the oxygen content was gradually increased to 12.0v%. Keep the temperature at 430°C for 2 hours, gradually increase the oxygen content to 18.0v%; keep the temperature at 740°C for 2 hours, gradually increase the oxygen content to 21v%, and the heating rate between each stage is 5°C per minute. Add 100ml of leaching solution (wherein the molar concentration of sodium hypochlorite is 5mol / L, and the molar concentration of hydrochloric acid is 10mol / L) to the above sample, stir at 200°C for 2h, filter and fully wash the precipitate, and adjust the concentration of the solution containing platinum with sodium hydroxide. pH value to 4, remove the precipitate; then add sodium hydroxide to adjust the pH value of the solution to 8, remove the precipitate, reduce with hydrazine hydrate to obtain platinum grou...

Embodiment 2

[0023] 10.0 g of industrial Pt / alumina waste catalyst containing 0.250w% Pt was kept at 70°C for 1 hour, and the oxygen content was adjusted to 5.0v%, and at 250°C for 2 hours, the oxygen content was gradually increased to 12.0v %, keep the temperature at 450°C for 2 hours, gradually increase the oxygen content to 18.0v%; keep the temperature at 760°C for 3 hours, gradually increase the oxygen content to 21v%, and the heating rate between each section is 6 per minute ℃. Add the above sample into 150ml leaching solution (where the molar concentration of sodium hypochlorite is 5mol / L, the molar concentration of acid is 5mol / L, and the molar concentration of sodium chloride is 5mol / L), stir at 150°C for 3h, filter and wash the precipitate fully, and wash with hydrogen Sodium oxide adjusts the pH value of the solution containing platinum to 5, and removes the precipitate; then adds sodium hydroxide to adjust the pH value of the solution to 9, removes the precipitate, and then redu...

Embodiment 3

[0025] 10.0g of industrial Pd / alumina waste catalyst containing 0.30w% Pd, keep the temperature at 50°C for 2 hours, adjust the oxygen content to 8.0v%, keep the temperature at 230°C for 2 hours, gradually increase the oxygen content to 15.0v% , keep the temperature at 420°C for 2 hours, gradually increase the oxygen content to 18.0v%; keep the temperature at 700°C for 2 hours, gradually increase the oxygen content to 21v%, and the heating rate between each section is 4°C per minute . Add the above sample into 500ml leaching solution (where the molar concentration of sodium hypochlorite is 10mol / L, the molar concentration of nitric acid is 10mol / L, and the molar concentration of sodium chloride is 5mol / L), stir at 100°C for 5h, filter and wash the precipitate fully, and use hydrogen Sodium oxide adjusts the pH value of the solution containing platinum to 5, and removes the precipitate; then adds sodium hydroxide to adjust the pH value of the solution to 9, removes the precipit...

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Abstract

A method for recovering noble metal from waste catalysts containing noble metal is carried out by pre-treating for waste catalysts containing noble metal, stage roasting, leaching noble metal into solution, purifying and recovering noble metal from solution. The immersion liquid adopts mixed solution with sodium hypochlorite, hydrion and chlorine ion. It's cheap, safe, clean and complete. It has less pollution and higher recovery rate.

Description

1. Technical field [0001] The invention belongs to a method for recovering metal components from spent catalysts, in particular to a method for recovering precious metals from spent catalysts containing precious metals. 2. Background technology [0002] With the advancement of science and technology and the improvement of environmental regulations, precious metals are not limited to making decorations and playing a role in economics and finance, but also have been used in industrial production processes, especially in the catalysts used in petrochemical processes. application. [0003] Precious metals such as palladium and platinum play an important and irreplaceable role in various fields due to their unique physical and chemical properties. However, my country's palladium and platinum resources are very scarce, and the price is very expensive, while the domestic demand is increasing year by year, and more than 90w% of the domestic demand needs to be imported. At the same...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B11/00C22B3/04C22B7/00
CPCY02P10/20
Inventor 王敏段为宇凌凤香孙万富张喜文
Owner CHINA PETROLEUM & CHEM CORP
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