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Method of obtaining copper from copper-bearing ores
| Details |
Inventors: DeMarthe, Jean-Michel; Sonntag, Alain; Georgeaux, Andre;
Assignee: Societe Miniere et Metallurgique de Penarroya (Paris, FR)
Primary Examiner: Ozaki; G.
Assistant Examiner:
Attorney, Agent or Firm: Fleit & Jacobson
The invention provides a method for obtaining electrolytic copper from copper-bearing ores which involves (a) lixiviating a sulphurized copper concentrate with an aqueous solution containing cupric chloride; (b) separating the solution resulting from the lixiviation stage (a) into two parts, one of said parts, containing at least 1 gram of cuprous ions per liter and at least 2 grams of ferrous ions per liter, being subjected to oxidation by air at atmospheric pressure, at a pH value between 1 and 3, and at a temperature above 90.degree. C., resulting in the precipitation of goethite [FeO(OH)] which is separated, and the resulting solution then recycled to the lixiviation stage (a); (c) partially extracting the copper contained in the other part of the solution resulting from the lixiviation stage (a) by contacting the solution with an organic phase containing a cationic solvent, this extraction being accompanied by oxidation by injection of air; (d) re-extracting the copper, now contained in the organic phase, by contacting the latter with an aqueous sulphuric acid solution and recycling the organic phase to extraction stage (c); and (e) treating the copper sulphate solution obtained from the preceding stage (d) to obtain, on the one hand, elemental copper, and, on the other hand, an aqueous sulphuric acid solution which is recycled to the re-extraction stage (d), the major part of the aqueous phase resulting from stage (c) at which copper is partially extracted being recycled to the lixiviation stage (a). |
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DETAILED DESCRIPTION We claim: 1.
A method for obtaining electrolytic copper from copper-bearing ores comprising: a.
lixiviating a sulphurized copper concentrate with an aqueous solution containing cupric chloride; b.
separating into two parts the solution resulting from the lixiviation stage a), one of said parts, containing at least 1 gram of cuprous ions per liter and at least 2 grams of ferrous ions per liter, being subjected to oxidation by air at atmospheric pressure, at a pH-value of between 1 and 3 and, at a temperature above 90.
degree.
C.
, with precipitation of goethite and separation thereof, the resulting solution then being recycled to the lixiviation stage a); c.
partially extracting the copper contained in the other of said parts of the solution resulting from the lixiviation stage a), by contacting said solution with an organic phase containing a cationic solvent, said extraction being accompanied by oxidation by the injection of air; d.
re-extracting the copper contained in said organic phase by contacting the latter with an aqueous sulphuric acid solution and recycling the organic phase to the extraction stage c); and e.
treating the copper sulphate solution obtained from the preceding stage to obtain, on the one hand, elemental copper, and, on the other, an aqueous sulphuric acid solution which is recycled to the re-extraction stage d), the major part of the aqueous phase which results from the stage c) at which copper is partially extracted being recycled to the lixiviation stage a).
2.
A method according to claim 1 wherein the aqueous lixiviation solution also contains a reagent for solubilizing cuprous chloride which is selected from the group consisting of alkali metal chlorides, alkaline-earth metal chlorides, ammonium chloride, and ferrous chloride.
3.
A method according to claim 2 wherein the reagent for solubilizing cuprous chloride is sodium chloride used in an amount between 100 and 300 grams per liter.
4.
A method according to claim 1 wherein the lixiviation stage a) is carried out at a temperature above 50
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Heat Accumulators 
