Method of leaching copper ore
View Patent ↗Provided is a method of leaching copper ore which contains chalcopyrite, the method includes a first leaching stage based on an oxidative leaching reaction of copper by iron (III) ion, and a second leaching stage, in succession to the first leaching stage, using a solution containing iodide ion and iron (III) ion.
1. A method of leaching copper ore which contains chalcopyrite, the method comprising a first leaching stage based on an oxidative leaching reaction of copper by iron (III) ion to reduce secondary copper sulfide ore in the copper ore, and a second leaching stage, in succession to the first leaching stage, using a solution containing iodide ion and iron (III) ion.
2. The method according to claim 1 , wherein the first leaching stage is proceeded until yield of leaching of secondary copper sulfide ore in the copper ore reaches 80% by mass of said secondary copper sulfide ore or above.
3. The method according to claim 1 , wherein in the first leaching stage 1 to 3 m 3 of leaching solution per one ton of ore is provided to thereby leach the copper ore.
4. The method according to claim 3 , wherein in the first leaching stage the leaching solution has an iron (III) ion concentration of 2 to 5 g/L.