US3728430A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for processing copper values
Assignee: ANLIN CO
•
Filing: 1970-12-14
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Granted: 1973-04-17
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Expires: 1990-12-14
Abstract
Abstract The steps of leaching copper values from oxide ores, mixed sulfide-oxide ores, and other oxide copper bearing materials in an aqueous medium or suspension containing soluble sulfites or bisulfites and precipitating the copper as copper sulfide in an aqueous medium or suspension containing elemental sulfur and soluble sulfites or bisulfites. The precipitated copper, along with any other copper present as elemental copper or copper sulfide, is then separated by conventional methods.
Inventors
- 👤 J Clitheroe
- 👤 F Lacy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 08:21
CPC Classifications
C; C01; C01G; C01G3/00; C01G3/12; B; B03; B03B; B03B1/00; B03B1/04
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
40 words
The method of claim 1 wherein: said leaching and precipitating step is carried out in the presence of a Stoichiometric excess of sulfur dioxide and elemental sulfur in relation to the amount of oxide copper in said copper containing material.
Claim 2
Dependent Claim
70 words
The method of claim 1 wherein: said leaching and precipitating step includes the additional step of adding an acid selected from the group consisting of sulfuric, hydrochloric, nitric, hydroiodic, hydrofluoric, fluosilicic, phosphoric, acetic and formic to said pulp prior to completion of the precipitating portion of said leaching and precipitating step in an amount sufficient to maintain the pH thereof in the range of from about 1.0 to about 9.4.
Claim 3
Dependent Claim
24 words
The method of claim 1 wherein: said leaching and precipitating step is carried out in said pulp in the presence of a soluble chloride.
References Cited (Backward Citations)
US1335000A
Cited
US1335001A
Cited
US1197589A
Cited
US1360666A
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US1679294A
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US2332145A
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US3168396A
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US3218161A
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US3322532A
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US3330649A
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US3573896A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-04-16 | 1976-10-16 | 1977-04-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-16 | 1980-10-16 | 1981-04-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-16 | 1984-10-16 | 1985-04-17 | $7700.00 | Window Closed / Lapsed |