Patent US4998500A successfully refreshed from Google Patents.
Patent US3998926A successfully refreshed from Google Patents.
US3998926A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Treatment of material with hydrogen chloride
Assignee: Matthey Rustenburg Refiners Pty Ltd
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Filing: 1975-03-18
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Granted: 1976-12-21
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Expires: 1995-03-18
Abstract
Abstract This invention relates to refining platinum group metal concentrates and the separation therefrom of silver and of the majority of base metals which are present with them. In more detail, the process comprises reacting together gaseous hydrogen and chlorine so as to produce a flame and passing into the reaction zone of the said flame the said mineral concentrate in finely divided particulate form. The specification also describes an apparatus for carrying out the above process comprising a tubular burner having a hydrogen-chlorine flame discharging into an inner heat resistant tube and means for maintaining the inner tube at an elevated temperature up to at least 2500° C.
Inventors
- 👤 Raymond Edward Oliver
- 👤 George McGuire
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 23:19
CPC Classifications
C; C22; C22B; C22B1/00; C22B1/02; C22B1/08; C22B11/00; C22B11/02
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
133 words
A process for the separation of components of base metal and silver from precious metal components in mineral concentrates which comprises reacting together gaseous hydrogen and chlorine so as to produce a flame providing a reaction zone having a temperature within the range 900° to 2500° C, passing into the reaction zone of the said flame the said mineral concentrate in finely divided particulate form to obtain a reaction product wherein silver and base metal in said concentrate are converted to their volatile chlorides while the precious metal components in said concentrate remain in a solid, water-insoluble form and separating the silver and base metal chlorides from the water-insoluble solids in the reaction product, said base metal being selected from the group consisting of Sb, Sn, Pb, Zn, Cu, Ni, Fe and As.
Claim 2
Dependent Claim
133 words
A process for the separation of components of base metal and silver from precious metal components in mineral concentrates which comprises reacting together gaseous hydrogen and chlorine so as to produce a flame providing a reaction zone having a temperature within the range 900° to 2500° C, passing into the reaction zone of the said flame the said mineral concentrate in finely divided particulate form to obtain a reaction product wherein silver and base metal in said concentrate are converted to their volatile chlorides while the precious metal components in said concentrate remain in a solid, water-insoluble form and separating the silver and base metal chlorides from the water-insoluble solids in the reaction product, said base metal being selected from the group consisting of Sb, Sn, Pb, Zn, Cu, Ni, Fe and As.
Claim 3
Dependent Claim
17 words
A process according to claim 1 in which equimolar quantities of hydrogen and chlorine are reacted together.
Claim 4
Dependent Claim
12 words
A process according to claim 1 in which hydrogen burns in chlorine.
Claim 5
Dependent Claim
12 words
A process according to claim 1 in which chlorine burns in hydrogen.
Claim 6
Dependent Claim
19 words
A process according to claim 1 in which at least one of the reacting gases contains a diluent gas.
Claim 7
Dependent Claim
17 words
A process according to claim 1 in which the said temperature is within the range 1500°-2500° C.
Claim 8
Dependent Claim
24 words
A process according to claim 1 in which water soluble chlorides of base metals are leached from the reaction product by dissolution in water.
Claim 9
Dependent Claim
24 words
A process according to claim 7 in which the precious metal containing concentrate which remains is dissolved in hydrochloric acid containing an oxidising agent.
References Cited (Backward Citations)
US2104741A
Cited
US3049422A
Cited
US3227545A
Cited
US3174848A
Cited
US3694168A
Cited
US3615202A
Cited
US3849543A
Cited
US3825651A
Cited
US3834896A
Cited
US3802873A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-12-21 | 1980-06-21 | 1980-12-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-12-21 | 1984-06-21 | 1984-12-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-12-21 | 1988-06-21 | 1988-12-21 | $7700.00 | Window Closed / Lapsed |