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US4113471A
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Extraction of non-ferrous metal values from dolomitic oxide ores
Assignee: Dow Chemical Co
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Filing: 1976-12-02
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Granted: 1978-09-12
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Expires: 1996-12-02
Abstract
Abstract A process for extracting non-ferrous metal values from an oxide ore. The process comprises leaching the ore with a solution containing at least one alkali metal chloride or alkaline earth chloride salt in the presence of an oxygen-containing gas at a temperature and pressure sufficient to solubilize the non-ferrous metal values into the solution of the metal chloride salt.
Inventors
- 👤 Martin A. Langhorst
- 👤 Gerard C. Sinke
- 👤 Elmer H. Mossner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 15:36
CPC Classifications
C; C22; C22B; C22B3/00; C22B3/04; C22B3/06; C22B3/10; C22B11/00; C22B11/04; Y; Y02; Y02P; Y02P10/00; Y02P10/20
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
107 words
A process for extracting values of non-ferrous metals selected from the group consisting of silver, copper, lead, zinc, gold, nickel, magnesium, and chromium from a dolomitic oxide ore comprising: leaching the ore with an aqueous solution consisting essentially of at least one metal chloride salt selected from the group consisting of alkali metal chlorides and alkaline earth chlorides in the presence of an oxygen-containing gas at a temperature of from about 125° C to about 225° C at a pressure of from about 200 to about 600 pounds per square inch gauge to solubilize the non-ferrous metal values into the aqueous solution of the metal chloride salt.
Claim 2
Dependent Claim
107 words
A process for extracting values of non-ferrous metals selected from the group consisting of silver, copper, lead, zinc, gold, nickel, magnesium, and chromium from a dolomitic oxide ore comprising: leaching the ore with an aqueous solution consisting essentially of at least one metal chloride salt selected from the group consisting of alkali metal chlorides and alkaline earth chlorides in the presence of an oxygen-containing gas at a temperature of from about 125° C to about 225° C at a pressure of from about 200 to about 600 pounds per square inch gauge to solubilize the non-ferrous metal values into the aqueous solution of the metal chloride salt.
Claim 3
Dependent Claim
13 words
The process of claim 1 wherein the non-ferrous metal values are silver values.
Claim 4
Dependent Claim
13 words
The process of claim 1 wherein the metal chloride salt is calcium chloride.
Claim 5
Dependent Claim
31 words
The process of claim 1 wherein the solution of the metal chloride salt has a concentration of from about 10 to about 70 percent by weight of the metal chloride salt.
Claim 6
Dependent Claim
31 words
The process of claim 4 wherein the solution of the metal chloride salt has a concentration of from about 25 to about 50 percent by weight of the metal chloride salt.
Claim 7
Dependent Claim
31 words
The process of claim 5 wherein the solution of the metal chloride salt has a concentration of from about 40 to about 45 percent by weight of the metal chloride salt.
Claim 8
Dependent Claim
21 words
The process of claim 1 wherein the oxygen-containing gas is selected from the group consisting of air, oxygen and mixtures thereof.
Claim 9
Dependent Claim
27 words
The process of claim 1 wherein the ore is in the form of particulate characterized as having particles with their longest dimension less than about 149 microns.
Claim 10
Dependent Claim
27 words
The process of claim 8 wherein the ore is in the form of particulate characterized as having particles with their longest dimension less than about 37 microns.
Claim 11
Dependent Claim
22 words
The process of claim 1 including the subsequent step of recovering solubilized elemental non-ferrous metal values from the metal chloride salt solution.
Claim 12
Dependent Claim
66 words
A process for extracting silver values from argentiferous dolomitic oxide ore comprising: leaching the ore with an aqueous leach solution consisting of calcium chloride in the presence of an oxygen-containing gas at a temperature of from about 125° C to about 225° C at a pressure of from about 200 to 600 pounds per square inch gauge to solubilize the silver values into the leach solution.
Claim 13
Dependent Claim
66 words
A process for extracting silver values from argentiferous dolomitic oxide ore comprising: leaching the ore with an aqueous leach solution consisting of calcium chloride in the presence of an oxygen-containing gas at a temperature of from about 125° C to about 225° C at a pressure of from about 200 to 600 pounds per square inch gauge to solubilize the silver values into the leach solution.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-09-11 | 1982-03-13 | 1982-09-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-09-11 | 1986-03-13 | 1986-09-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-09-11 | 1990-03-13 | 1990-09-12 | $7700.00 | Window Closed / Lapsed |