Method of leaching copper sulfide ore with the use of iodine
An object of the present invention is to provide a method of efficiently leaching copper from a copper sulfide ore containing chalcopyrite or enargite as a main constituent under versatile conditions for actual operation. A method of leaching copper from a copper sulfide ore, characterized by comprising using, as a leaching solution, a sulfuric acid solution containing iodide ions and ferric (III) ions in an excessive amount relative to the iodide ions and leaching copper from a copper sulfide ore; or a method of leaching copper from a copper sulfide ore, characterized by comprising leaching copper from a copper sulfide ore with the use of a leaching solution further containing water-soluble ligands such as chloride ions that can stabilize ferric (III) ions in addition to the above components, is provided.
1. A method of recovering copper from copper sulfide ores, characterized by comprising using, as a leaching solution, a sulfuric acid solution containing iodide ions and ferric (III) ions in a substantially greater amount relative to the iodide ions, and leaching copper from a copper sulfide ore.
2. The method according to claim 1 , wherein the copper sulfide ore is a copper sulfide ore containing chalcopyrite or enargite as a main constituent.
3. The method according to claim 1 or 2 , wherein the total iodine concentration derived from iodide ions in the leaching solution and iodine and/or tri-iodide ions generated by oxidation of the iodide ions is 100 to 300 mg/L.
4. The method according to claim 1 , wherein the ferric (III) ion content in the leaching solution is 23 to 120 times higher than the iodide ion content therein in terms of weight.
5. The method according to claim 1 , wherein the ferric (III) ion content in the leaching solution is 0.6 to 1.8 times higher than the chalcopyrite in the copper sulfide ore in terms of weight.
6. The method according to claim 1 , wherein the leaching solution further contains water-soluble ligands that can stabilize ferric (III) ions.
7. The method according to claim 6 , wherein the water-soluble ligands are chloride ions.
8. The method according to claim 7 , wherein the chloride ion content in the leaching solution is 0.1 to 2.3 times higher than the ferric (III) ion content therein in terms of weight.