Abstract
Copper flotation concentrates can be oxidized while simultaneously fixing 98 pct of the sulfur as CaSO4 and copper sulfates if a mixed lime-concentrate balled pellet is roasted at low temperatures. The roasting pellet exhibits a reacted shell surrounding the unreacted core. The rate is controlled by oxygen diffusion in the pores of the roasted shell and kinetic details are given. At higher temperatures the rate decreases because of sintering and decreased porosity in the shell. Complete roasting of the pellets while controlling the pellet temperature to prevent formation of insoluble copper ferrites is required for subsequent hydrometallurgical extraction.
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Formerly Graduate Student, Stanford University
Formerly Associate Professor, Stanford University.
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Haung, H.H., Bartlett, R.W. Oxidation kinetics of a lime-copper concentrate pellet. Metall Trans B 7, 369–374 (1976). https://doi.org/10.1007/BF02652707
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DOI: https://doi.org/10.1007/BF02652707