Specialized metallurgical processes – compositions for use therei – Processes – Free metal or alloy reductant contains magnesium
Reexamination Certificate
1996-07-29
2003-09-30
Andrews, Melvyn (Department: 1742)
Specialized metallurgical processes, compositions for use therei
Processes
Free metal or alloy reductant contains magnesium
C075S010280, C075S632000, C075S633000, C075S421000
Reexamination Certificate
active
06626978
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to a method for dressing a material comprising noble metals and platinum group metals, respectively, as well as impurities, and means for performing said method.
In practice, materials come to hand which have a total content of gold, platinum, palladium, rhodium, and iridium of 20% or more. Such materials mostly contain impurities being accompanying metals of said elements and/or other elements, which form volatile compounds and compounds of chlorine, respectively, with oxygen, hydrogen and chlorine. Materials of this kind may be residues from other processes, mixtures or alloys.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide a method for dressing said materials in such a way that a concentrated residue of gold, platinum, palladium, rhodium and/or iridium is left, this dressing being done as economically and environmentally safe as possible.
In the method of the above kind, for dressing a material comprising noble metals including platinum group metals, as well as undesired materials comprises subjecting the materials to an oxidizing treatment at a temperature within a first temperature range. The material is then subsequently subjected to a reducing treatment at a temperature within a second temperature range. Finally, the material is chlorinated at a temperature within a third temperature range.
Another object of the present invention is providing means for performing said method.
According to the present invention, a device for performing a method for dressing a material comprising noble metals, including platinum group metals, as well as impurities, comprises a reactor vessel that includes an inlet for a treatment medium for the material. The inlet is located in the lower region of the reactor vessel. The vessel also includes an outlet for the treatment medium that is located in an upper region of the reactor vessel. The reactor vessel also includes a device for distributing a stream of the treatment medium that is arranged inside the reactor vessel.
REFERENCES:
patent: T867020 (1969-10-01), Strickland
patent: 3867137 (1975-02-01), Inouye
patent: 3998926 (1976-12-01), Oliver et al.
patent: 4086084 (1978-04-01), Oliver et al.
patent: 1 052 367 (1959-03-01), None
patent: 1.547.653 (1968-11-01), None
patent: 2 264 880 (1975-10-01), None
patent: 798712 (1958-07-01), None
patent: 3-13532 (1991-01-01), None
Patent Abstracts of Japan, vol. 013, No. 562 (C-665), Dec. 13, 1989 & JP,A,01 234532 (Tanaka Kikinzoku Kogyo KK) Sep. 19, 1989.
Panias, Dimitris, et al. (1990) “Gold extraction from pyrite cinders by high temperature chlorination”, in: Erzmetal, vol. 43, No. 1, pp. 41-44.
Andrews Melvyn
Prior Engineering AG
Townsend & Townsend & Crew LLP
LandOfFree
Method for dressing materials does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method for dressing materials, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method for dressing materials will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3053723