| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a chlorine leaching method of a nickel sulfide, capable of improving leach rates of nickel and cobalt when carrying out chlorine leaching of the nickel sulfide produced by wet smelting of nickel oxide ore. <P>SOLUTION: In the method, the nickel sulfide produced by wet smelting of nickel oxide ore is used as a raw material and is subjected to chlorine leaching in an aqueous chloride solution containing copper ions. The method comprises: a step (1) of adding hydrochloric acid to a slurry obtained by repulping the nickel sulfide in the aqueous chloride solution so as to adjust the pH to 0.4-0.6; a step (2) of blowing a chlorine gas into the slurry obtained in step (1) in the presence of copper ions; a step (3) of blowing air into the slurry obtained in step (2); and a step (4) of subjecting the slurry obtained in step (3) to solid-liquid separation so as to obtain a nickel-containing leachate and leaching residues. <P>COPYRIGHT: (C)2009,JPO&INPIT</p> |
