The invention provides a method for separating and extracting
copper and
cobalt-
nickel in low-grade complex mixed
copper-
cobalt ore, which uses low-grade complex mixed
copper-
cobalt ore (
sulfide and
oxide) as a
raw material to extract an
intermediate product of the copper and cobalt-
nickel by adopting process flows of crushing and
grinding ore into
slurry, leaching the
slurry with acidic villaumite by a wet method, extracting copper
powder by reduction and replacement, vulcanizing and depositing
nickel (cobalt), concentrating,
drying, baking and hydrolyzing deposited mother solution at low temperature and the like. The method comprises main technical points that metallic elements in the mixed copper-cobalt ore are dissolved and leached by the acidic villaumite under normal pressure; copper in leaching liquor is reduced and deposited by a
reducing agent; the cobalt and nickel are deposited by a vulcanizing agent to obtain the
intermediate product; the mother solution is concentrated, dried, baked and hydrolyzed at low temperature after cobalt-
nickel deposition to obtain
metal oxide,
metal oxychloride and
hydrogen chloride containing iron,
magnesium and the like;
hydrogen chloride is reclaimed to obtain
hydrochloric acid, and baked
solid is leached into water to obtain
chloride solution; and the
hydrochloric acid and the chloride solution are used for leaching of ore
slurry. The method comprehensively reclaims the copper, the cobalt-nickel and the like, and has the characteristics of high
leaching rate of the copper and the cobalt-nickel, less
energy consumption, low cost, closed circulation of
chlorine (
hydrochloric acid), less investment of
project engineering and the like. The whole process is concise, clean and environment-friendly. The method is particularly applicable to large-scale industrial production.