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US3778252A Expired / Lapsed US ⏱️ 0.0 years remaining

Process for separation and recovery of gold

Assignee: ATE ENTERPRISES Inc
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Filing: 1970-02-12
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Granted: 1973-12-11
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Expires: 1990-02-12
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Abstract

Abstract Processes for and compositions utilized in the recovery of the gold content of gold containing substances by subjecting such substances -preferably in comminuted form- to the action of one of the following solvent system families: A. Aqueous gold solvation systems comprising primary or secondary mono-hydroxy alcohols, saccharides and/or carboxylic acids and iodine or bromine. B. Aqueous iodine-containing gold solvation systems comprising primary or secondary monohydroxy alcohols and ditri- and polyhydric alcohols in the place of or in addition to saccharides and carboxylic acids. C. Essentially non-aqueous gold solvating systems comprising secondary alcohols and iodine. Solvation of the gold occurs during agitation and heating of the slurry. The gold contents are removed from the gold pregnant solution by displacement onto a non-noble metal surface. The solid gold containing residue is treated with sufficient aqueous hydroxide solution to convert excess non-noble metal into its water-soluble salt. The remaining insoluble material containing the gold metal recovered is rinsed to remove any remaining unreacted alkali and the soluble salts and is then digested with concentrated sulfuric acid to dissolve any remaining acid soluble impurities, the remaining acid insoluble residue is rinsed, dried and comprises substantially pure gold metal.

Inventors

  • 👤 H Wilson

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-26 05:34
CPC Classifications
C; C22; C22B; C22B3/00; C22B3/04; C22B3/16; C22B11/00; C22B11/04; Y; Y02; Y02P; Y02P10/00; Y02P10/20

Claims Analysis

Total Claims: 17
Claim 1
Independent Claim 15 words
The process of claim 1 wherein the said dissolved organic compound is a polyhydric alcohol.
Claim 2
Dependent Claim 15 words
The process of claim 1 wherein the saccharide utilized in the said solvent is sucrose.
Claim 3
Dependent Claim 15 words
The process of claim 1 wherein the halogen utilized in the said solvent is iodine.
Claim 4
Dependent Claim 43 words
The process of claim 1 wherein at least a portion of the water, primary and secondary mono-hydroxy alcohols, saccharides and carboxylic acids are supplied by an alcoholic beverage selected from the group of distilled alcoholic beverages, undistilled alcoholic beverage ferments and mixtures thereof.
Claim 5
Dependent Claim 15 words
The process of claim 5 wherein the solvent is additionally fortified with ethanol and sucrose.
Claim 6
Dependent Claim 22 words
The process of claim 1 wherein the saccharides are selected from the group consisting of mono-, di- and polysaccharides and mixtures thereof.
Claim 7
Dependent Claim 27 words
The process of claim 1 wherein the carboxylic acids are selected from the group consisting of mono- di- and polyhydroxy mono and dicarboxylic acids and mixtures thereof.
Claim 8
Dependent Claim 13 words
The process of claim 1 wherein said solubilizing step includes agitating said solvent.
Claim 9
Dependent Claim 20 words
The process of claim 1 wherein said halogen does not exceed an excess of 20 percent over the stoichiometric requirements.
Claim 10
Dependent Claim 39 words
The process of claim 1 wherein the said solvent is prepared by dissolving the noted ingredients and heating same under reflux until the liquid condensate is slightly yellow indicating that the halogen employed has combined chemically with the solution.
Claim 11
Dependent Claim 96 words
The process of claim 1 wherein the process for recovering the gold content of the said gold pregnant solution comprises: a. placing a quantity of non-noble metal selected from the group consisting of: silver, copper, iron, zinc and aluminum into the said gold-pregnant solution, b. heating the said solution until the gold contents have become substantially displaced from the solution and are found adhering to the non-noble metal or as a free metal on the bottom of the vessel employed, and c. removing the solvent freed of its gold contents leaving a solid gold containing residue.
Claim 12
Dependent Claim 21 words
The process of claim 12 wherein the non-noble metal employed for displacement of the noble metal is aluminum in sheet form.
Claim 13
Dependent Claim 38 words
The process of claim 12 wherein the solvent which has been freed of its contents of noble metal is thereafter fortified with elemental iodine and is adapted to be re-used for solvation of gold from substances containing same.
Claim 14
Dependent Claim 82 words
The process of claim 12 wherein the solid gold containing residue, after being separated from the solvent, is thereafter sequentially subjected to the following steps: a. washing free of any remaining gold pregnant solution with a fresh portion of solvent, b. moderate heating to volatilize residual solvent, c. treating with aqueous nitric acid solution to dissolve the non-noble metal residue, d. separating said nitric acid insoluble gold metal residue, and e. rinsing said gold metal residue with water to remove contaminates therefrom.
Claim 15
Dependent Claim 85 words
A process for the separation and recovery of gold and/or compounds of gold from particulate materials containing the same which comprises intimately admixing a particulate material containing gold and/or gold compounds with an essentially non-aqueous gold solvation system, said system consisting essentially of an aliphatic secondary alcohol solution containing at least the stoichiometric quantity of dissolved elemental iodine to dissolve the gold and/or gold compounds from said material into said solution; separating said solution from said material; and recovering the gold content from said solution.
Claim 16
Dependent Claim 11 words
The process of claim 16 wherein the said alcohol is isopropanol.
Claim 17
Dependent Claim 52 words
The process of claim 16 which includes the step of subjecting mine run ore after it has been pulverized to a fineness where 90 percent or more is minus 200 mesh U.S. standard sieve size to moderate heating to a dull red heat in the range of 450* C. to 600* C.

References Cited (Backward Citations)

US682061A Cited
US2239519A Cited
US2304823A Cited
US3511645A Cited
US3625674A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1976-12-10 1977-06-11 1977-12-11 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1980-12-10 1981-06-11 1981-12-11 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1984-12-10 1985-06-11 1985-12-11 $7700.00 Window Closed / Lapsed

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