Patent US3902896A successfully refreshed from Google Patents.
US3902896A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cementation of metals from acid solutions
Assignee: Huntington Alloys Corp
•
Filing: 1974-05-22
•
Granted: 1975-09-02
•
Expires: 1994-05-22
Abstract
Abstract Discloses the use of soluble thiosulfate in aqueous acidic solutions to aid the cementation of metals from solution. The invention is particularly useful in the recovery of copper, silver, gold and platinum group metals from aqueous acidic solutions.
Inventors
- 👤 Gyula J Borbely
- 👤 Leander E Cupp
- 👤 Brian Martin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 22:56
CPC Classifications
C; C22; C22B; C22B15/00; C22B15/0063; C22B15/0084; C22B15/0089; C22B15/0091; C22B3/00; C22B3/20; C22B3/44; C22B3/46; Y; Y02; Y02P; Y02P10/00; Y02P10/20
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
133 words
IN A PROCESS FOR CEMENTING A METAL FROM AN ACIDIC, EQUEOUS SOLUTION ON A PARTICULATE BASE METAL THAT IS HIGHER IN THE ELECTROMOTIVE SERIES THAN IS THE METAL TO BE RECOVERED, SAID PARTICULATE BASE METAL BEING INSUFFIENTLY ACTIVE TO REACT WITH WATER TO PRODUCE SIGNIFICANT QUANTITIES OF HYDROGEN AND SAID AQUEOUS SOLUTION BEING INSUFFICIENTLY ACIDIC TO REACT WITH LESS ACTIVE PARTICULATE METAL TO PRODUCE SIGNIFICANT AMOUNTS OF HYDROGEN, THE IMPROVEMENT WHICH COMPRISES ADDING WATERSOULABLE THIOSULFATE TO SAID ACIDIC AQUOUS SOLUTION, IN SAMLL BUT EFFECTIVE AMOUNTS UP TO ABOUT 10 PARTS BY WEIGHT OF SULFUR AS THIOSULFATE PER EACH 100 PARTS BY WEIGHT OF METAL TO BE CEMENTED, PRIOR TO OR DURING CEMENTATON SO THAT THE CEMENTED METAL READILY FLAKES OF THE PARTICULATE BASE METAL EXPOSING FRESH SURFACES FOR THE CEMENTATION REACTION TO CONTINUE.
Claim 2
Dependent Claim
133 words
IN A PROCESS FOR CEMENTING A METAL FROM AN ACIDIC, EQUEOUS SOLUTION ON A PARTICULATE BASE METAL THAT IS HIGHER IN THE ELECTROMOTIVE SERIES THAN IS THE METAL TO BE RECOVERED, SAID PARTICULATE BASE METAL BEING INSUFFIENTLY ACTIVE TO REACT WITH WATER TO PRODUCE SIGNIFICANT QUANTITIES OF HYDROGEN AND SAID AQUEOUS SOLUTION BEING INSUFFICIENTLY ACIDIC TO REACT WITH LESS ACTIVE PARTICULATE METAL TO PRODUCE SIGNIFICANT AMOUNTS OF HYDROGEN, THE IMPROVEMENT WHICH COMPRISES ADDING WATERSOULABLE THIOSULFATE TO SAID ACIDIC AQUOUS SOLUTION, IN SAMLL BUT EFFECTIVE AMOUNTS UP TO ABOUT 10 PARTS BY WEIGHT OF SULFUR AS THIOSULFATE PER EACH 100 PARTS BY WEIGHT OF METAL TO BE CEMENTED, PRIOR TO OR DURING CEMENTATON SO THAT THE CEMENTED METAL READILY FLAKES OF THE PARTICULATE BASE METAL EXPOSING FRESH SURFACES FOR THE CEMENTATION REACTION TO CONTINUE.
Claim 3
Dependent Claim
30 words
A process as in claim 1 wherein at least 0.1 part by weight of sulfur as thiosulfate is added per each 100 parts by weight of metal to be cemented.
Claim 4
Dependent Claim
67 words
A process as in claim 1 carried out in two or more stages wherein the particulate base metal is caused to move from one stage to another countercurrent to the flow of acidic, aqueous solution to provide as a product of the final stage acidic, aqueous solution essentially free of cementable metal and as a product of the first stage a cement metal rich in cementable metal.
Claim 5
Dependent Claim
14 words
A process as in claim 1 wherein the metal to be cemented is copper.
Claim 6
Dependent Claim
23 words
A process as in claim 4 wherein the particulate base metal is selected from the group of aluminum, zinc, iron, cobalt and nickel.
Claim 7
Dependent Claim
13 words
A process as in claim 5 wherein the particulate base metal is iron.
Claim 8
Dependent Claim
23 words
A process as in claim 4 wherein metal from the group of gold, silver and platinum group metals is cemented along with copper.
Claim 9
Dependent Claim
27 words
A process as in claim 1 wherein the particulate base metal is given an acid wash prior to being placed in contact with said acidic, aqueous solution.
Claim 10
Dependent Claim
23 words
A process as in claim 4 wherein the copper is cemented from a nickel process solution using nickel as the particulate base metal.
Claim 11
Dependent Claim
28 words
A process as in claim 9 wherein elements of the group of lead, arsenic, bismuth, antimony and selenium are removed from said nickel process solution along with copper.
Claim 12
Dependent Claim
24 words
A process as in claim 1 wherein the metal to be cemented is from the group of gold, silver, copper and the platinum-group metals.
References Cited (Backward Citations)
US1624172A
Cited
US1592307A
Cited
US1703763A
Cited
US2576314A
Cited
US2693404A
Cited
US2727818A
Cited
US2687953A
Cited
US3117000A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-09-01 | 1979-03-03 | 1979-09-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-01 | 1983-03-03 | 1983-09-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-01 | 1987-03-03 | 1987-09-02 | $7700.00 | Window Closed / Lapsed |