A method for recovering nickel and copper from a sulfide copper-nickel ore beneficiation concentrate leach residue

Abstract

The application discloses a method for recovering nickel and copper from leaching residue of a copper nickel sulfide ore dressing concentrate, and belongs to the technical field of nickel copper sulfide ore metallurgy, and comprises the following steps: S1, heating and stirring; S2, adding water and stirring; S3, adding chemicals and stirring; S4, flotation; and S5, concentration and filtration. The method adopts segmented stirring, one segment adopts high-concentration heating and stirring, and the second segment adopts new water dilution and stirring, so that the stirring time is prolonged and the stirring is strengthened, the dissolution of water-soluble nickel and copper compounds is promoted, the nickel and copper enter water, and the nickel and copper in water return to the leaching process with the filtering backwater, so that the recovery is realized, the residue amount of the leaching residue is effectively reduced, and the nickel and copper content in the tailings is reduced. Because the leaching residue slurry is acidic, the commonly used xanthate and black medicine type flotation collectors are easy to decompose and lose effectiveness under the condition of an acidic medium, the acid-resistant collector and the foaming agent are used, the nickel and copper sulfides can be floated in the low-pH slurry system, and the nickel and copper content in the tailings is reduced. When the tailings are filtered, the colloid material is less, the filtering process is accelerated, and the turnover rate of the filter press is improved.

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