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The high-sulfur cobalt-copper ore treatment process

     

The high-sulfur cobalt-copper ore treatment process featuring low cost and high leaching efficiency mainly consists of the following unit operations: fluidized bed roasting, low-acid leaching, flotation, high-acid leaching, high-copper solvent extraction and low-copper solvent extraction.

After fluidized bed roasting of high-sulfur cobalt-copper ore, the sulfation rates of both cobalt and copper exceed 85%, the leaching efficiencies of cobalt and copper are both higher than 98%, and the grades of cobalt and copper in the leaching residue are lower than 0.15% and 0.30% respectively.

The roasting process is autothermal and requires no supplementary external energy, thus lowering energy cost. In addition, the steam generated during fluidized bed roasting can be used for heating in the hydrometallurgical leaching process.

For the sections of roasting, leaching and flotation, no other auxiliary materials are required except a small dosage of flotation reagents, leading to low auxiliary material cost. Meanwhile, no harmful elements such as chlorine will be introduced in the process, which avoids equipment corrosion and degradation of copper extractants.

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