| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a method for efficiently leaching at least copper, gold from copper sulfide ore. <P>SOLUTION: In the method for leaching the gold, the leaching of the copper till is performed until the copper grade is reduced to ≤7.9% in the copper sulfide ore containing the gold or the copper sulfide ore containing the gold-contained silicate ore ( a raw material), and the raw material reduced into ≤7.9% in the copper grade is mixed with the first solution dissolving chlorine ion and feric ion or with secondary solution becoming trivalent ferric ion by oxidizing the iron ion by injecting the air into the solution containing the chlorine ion and the iron ion, and the first solution or the second solution (henceforth, a gold reaching solution) is stirred while adjusting pH to ≤1.9, and at least the gold in the raw material is extracted from the leaching solution with the oxidizing force of ferric ion incorporated in the first or the second solution. Wherein, the concentration of gold is reduced by selectively removing the gold from all or apart of the gold leaching solution during the gold reaching.; therefore, this method for leaching out the gold, is lowered to the gold concentration by selectively removing the gold from the whole or a part of the solution for leaching out the gold during leaching out the gold. <P>COPYRIGHT: (C)2010,JPO&INPIT |
