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US 8,388,726 B2Granted
Processing copper sulfide ores
OwnerIffat Tahira Siddique, Izharul Haq Khaninventors
Life of this patent
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Abstract
Copper is chemically extracted from crude ores by first roasting it at temperature up to 500° C. for 90 minutes, then treating it with ammonium salt followed by leaching with sulfuric acid to obtain a soluble copper mass for further purification.
Claims3
A method for extracting copper from crude copper ore comprising:
- Reducing said crude copper to a size ranging from 50-200 microns;
- Adding to above said crude copper aluminum chloride equal in quantity to about 1/20 to ⅕ of the quantity of said crude ore;
- Roasting above mixture at 450-600 C for 80-100 minutes;
- Cooling down above mixture to room temperature;
- Adding above mixture to a 0.25 to 3% sulfuric acid, hydrochloric acid or nitric acid solution in a ratio of one part above mixture to five parts of said sulfuric acid, hydrochloric acid or nitric acid solution;
- Allowing above slurry to stand to leach for a period of 1-180 minutes;
- Decanting the solution above slurry;
- Filtering said decanted solution;
- and,
- Drying said filtered decanted solution to crystallize copper.
7 more elements
Dependencies are inferred from the claim text.