Characterization and Flotation of Sulfur from Chalcopyrite Concentrate Leaching Residue
- 1 Mineral Industry Research Laboratory University of Alaska Fairbanks, Fairbanks, AK 99775-7240
Abstract
Elemental sulfur produced by chloride leaching of sulfide ores or concentrates contains selenium and tellurium usually too high to be used in various industrial or agricultural uses. The sulfur in the leaching residue can be upgraded to 90% in grade by froth flotation and the sulfur concentration can be followed by sulfur purification and selenium and tellurium removal. The sulfur in the leaching is in a form of discrete particles with a size range of 5 to 10 microns. The sulfur particles tend to agglomerate in the pulp and hence mechanically entrap gangue minerals. With sodium silicate as the dispersant as well as the depressant for siliceous material, a sulfur concentrate of 90% in grade and 90% in recovery can be obtained with a single-stage froth flotation. The flotation reagent consumptions are minimum. The majority of chalcopyrite remains in the sulfur flotation tailings and can be readily recovered by flotation with different flotation reagents. When amyl xanthate is used, 85% of chalcopyrite can be recovered with a copper grade of 14.5% in a single-stage froth flotation. The chalcopyrite flotation concentrate can be sent back to chloride leaching circuits.
- Edmonson, N., 1994, “North American Sulfur Market: Structure and Outlook”, Mining Engineering, Vol 46, No 6, pp563-567.
- Weiss, N. L., 1985, “SME Mineral Processing Handbook”, Society of Mining Engineering, American Institute of Mining, Metallurgical and Petroleum Engineers, Inc., New York, NY, Section 28.
- U. S. Bureau of Mines, 1990, “Mineral Industry Surveys”, Copper Monthly, March, 20p.
- Christiansen, N. C., 1923, “Process of Treating Ores Containing Galena”, U. S. Patent 1,456,784.
- Haver, F. P., Baker, R. D., and Wong, M. M., 1975, “Improvements in Ferric Chloride Leaching of Chalcopyrite Concentrate”, U. S. Bureau of Mines, RI8007.
- Philips, T. A., 1976, “Economic Evaluation of a Process for Ferric Chlorite Leaching of Chalcopyrite”, U.S. Bureau of Mines IC8699.
- Lin, H. K., 1996, “Simultaneous Oxidation and Stripping for Separating Se and Te from Sulfur”, JOM, Vol 48, No 3., pp50-52.
- Lin, H. K., and Rao, P. D., 1995, “Process for Removing Selenium form Sulfur”, U. S. Patent, 5,378,488.
- Dalton, R. F., Price, R., Hermana, E., and Hoffman, B., 1988, “Cuprex-New chloride-based Hydrometallurgy to Recover Copper from Sulfide Ores”, Mining Engineering, Vol 40, No 1, pp24-28.
- Palmer, B. R., Nebo, C. O., Rau, M. F., and Fuerstenau, M. C., 1981, “Rate Phenomena Involved in the Dissolution of Chalcopyrite in Chloride-bearing Lixiviants”, Metallurgical Transaction, Vol 12B, pp595-601,
- Haver, F. P., and Wong, W. W., 1971, “Recovery of Copper, Iron and Sulfur from Chalcopyrite Concentrate Using a Ferric Chloride Leach”, Journal of Metals, Vol 23, No 2, pp25-29.
- Parker, A. J., Paul R. L., and Power G. C., 1981, “Electrochemical Aspects of Leaching Copper from Chalcopyrife in Ferric and Cupric Salt Solutions”, Aust. J. of Chemistry, Vol 34, pp13-34.
- Dutrizac, J. E., and MacDonald, R. J. C., 1974, “Ferric Ion as a Leaching Medium”, Minerals Sci. Engng., Vol 6, No 2, pp59-100.
- Weiss, N. L., 1985, “SME Mineral Processing Handbook”, Society of Mining Engineering, American Institute of Mining, Metallurgical and Petroleum Engineers, Inc., New York, NY, Section 5.
- Pourbaix, M., 1974, “Atlas of Electrochemical Equilibria in Aqueous Solutions”, National Association of Corrosion Engineers, Houston, Texas, p551.