Process for the recovery of precious metal from petrochemical process residues

Patent metadata

Field	Value
Publication number	US-10662500-B2
Application number	US-201815878533-A
Country	US
Kind code	B2
Filing date	Jan 24, 2018
Priority date	Jan 24, 2018
Publication date	May 26, 2020
Grant date	May 26, 2020

Abstract

A process for the recovery of precious metal (PM) from PM oil, the process including combustion of PM oil within a furnace, where the PM oil is burned in atomized form.

First claim

What is claimed is:

1. A process for the recovery of a precious metal from an oil comprising a precious metal and organic compounds, the process comprising:
atomizing the oil;
combusting the atomized oil to produce an off-gas; and
passing the off-gas over a precious metal collector to separate oil combustion residue containing a precious metal from the remainder of the off-gas, wherein the residue is non-gaseous at 20° C. and 10 5 Pa, wherein
the combustion takes place in an enclosed furnace chamber with an exhaust or abatement system, wherein the furnace chamber is equipped with the precious metal collector;
the precious metal collector is an air- or water-cooled container; and
the oil combustion residue becomes deposited on walls of the precious metal collector as the off-gas passes through the precious metal collector.

2. The process of claim 1 , wherein the oil has a precious metal content in the range of 0.01 to 0.8 wt.-%.

3. The process of claim 2 , wherein the precious metal content is composed of more than one precious metals.

4. The process of claim 1 , wherein the oil comprises rhodium.

5. The process of claim 1 , wherein the atomized oil is sprayed into a pilot flame.

6. The process of claim 1 , wherein the oil combustion of the atomized oil is performed with a stoichiometric amount or a stoichiometric excess of oxygen.

7. The process of claim 1 , wherein the atomized oil is combusted utilizing a forced-air burner.

8. The process of claim 1 , wherein the off-gas, after it has passed the precious metal collector and before it has left the exhaust or abatement system, is treated by passing it through one or more auxiliary collecting means in order to recover oil combustion residues containing a precious metal which has not been deposited on the precious metal collector.

9. The process of claim 8 , wherein the one or more auxiliary collecting means is/are selected from the group consisting of cyclone filter devices, fine particles filters and scrubber systems.

10. The process of claim 1 , wherein the oil combustion residue is subjected to wet-chemical or hydrometallurgical metal refining.

11. The process of claim 1 , wherein the furnace chamber contains an auxiliary precious metal collector.

12. The process of claim 11 , wherein the auxiliary precious metal collector contains coke or charcoal as a precious metal oil absorber material.

13. The process of claim 7 , wherein the forced-air burner is driven with air or oxygen-enriched air.

Assignees

• Heraeus Deutschland Gmbh & Co Kg
• Heraeus Precious Metals North America LLC

Inventors

• Peters Brian
• Taylor Jimmy
• Hobbs Chris
• Stoffner Felix
• Winkler Holger
• Richards Sr Thomas

Classifications

• C22B11/023 Primary

  from pyrometallurgical residues, e.g. from ashes, dross, flue dust, mud, skim, slag, sludge · CPC title

• C10G2300/1007

  Used oils · CPC title

• C22B11/026

  from spent catalysts · CPC title

• F23G7/05

  of waste oils · CPC title

• F23D11/00

  Burners using a direct spraying action of liquid droplets or vaporised liquid into the combustion space · CPC title