Patent ID: 11946116
Assignee: JX METALS CORPORATION
Field: Materials, metallurgy (Chemistry)
Classification: CPC C  Y | IPC C

Claim 0:
1. A method for recovering Cu from copper ore, the method comprising:
(A) providing copper ore containing 0.2 ppm or more of Hg;
(B) treating the copper ore to leach Cu in the ore, and to leach Hg in the ore, by using a solution containing iodide ions and Fe (3+) to produce a post-leaching solution containing iodide ions, Fe (2+), Cu ions, and Hg (2+), wherein a pH of the solution is 2.5 or less;
(C) treating the post-leaching solution with activated carbon to absorb the iodide ions and to absorb Hg (2+) in the post-leaching solution;
(D) treating the activated carbon with sulfurous acid and/or salt thereof to release the iodide ions, not Hg (2+), for reusing the released iodide ions for the step (B); and
(E) reusing the activated carbon that has been treated with sulfurous acid and/or salt thereof for the step (C),
wherein the step (B) of treating the copper ore to leach Cu in the ore and to leach Hg in the ore includes treating by using a solution consisting of:
at least one of a source of Fe (III) ions selected from the group consisting of iron (III) sulfate, iron (II) chloride to be oxidized, and iron (II) sulfate to be oxidized;
at least one of a source of iodide ions selected from the group consisting of sodium iodide, potassium iodide, ammonium iodide, hydrogen iodide and I2; and
sulfuric acid, and

wherein the method further comprises disposing Hg (2+) absorbed in the step (C) from the activated carbon.