Abstract
The effects of microwave treatment on the floatabilities and magnetic susceptibilities of some sulfide minerals, namely, pyrite, chalcopyrite, galena and sphalerite, were studied. Pure mineral samples were prepared in -425+212-μm, -212+106-μm and -106+38-μm size fractions. Microflotation and magnetic separation tests were curried out on the samples after microwave treatment at 600, 950 and 1,300 Watts for 5, 20, 60, 90, 120 and 240 seconds. The maximum temperature values of the samples were measured during the microwave treatment, and possible alterations on the mineral surfaces were determined by X-ray diffraction (XRD) analysis. The effects of microwave treatment are discussed based on the result of microflotation and magnetic separation tests. The results revealed that pyrite, chalcopyrite and galena were heated very quickly and that their surface temperatures reached -700 to 900°C while the temperature of sphalerite reached only ≈130°C. The float ability of pyrite, chalcopyrite and galena were decreased when microwave energy and the duration of treatment were increased, owing to oxidation of the mineral surfaces caused by relatively high temperature. As expected, there was no change in the float ability of sphalerite. The magnetic properties of pyrite and chalcopyrite were improved by the increase in microwave energy and the duration of treatment to such an extent that 90% of the feed separated as magnetic product. But no change was observed in the magnetic properties of galena and sphalerite.
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References
Bluhm, D.D., 1982, Selective Magnetic Enhancement of Pyrite in Coal by Dielectric Heating, 15–4766 EDB 013000.
Chen, T.T., Dutrizac, J.E., Haque, K.E., Wyslozil, W., and Kashyap, S., 1984, “The relative transparency of minerals to microwave radiation,” Can. Metall. Quart., Vol. 23, No. 1, pp. 349–351.
Ford, J.D., and Pei, D.C.T., 1967, “High Temperature Chemical Processing via Microwave Power,” Journal of Microwave Power, Vol. 2, No. 2, pp. 61–64.
Haque, K.E., 1987a, “Gold leaching from refractory ores-literature survey,” Min. Proc. Extv. Metall. Rev., Vol. 2, pp. 235–253.
Haque, K.E., 1987b, “Microwave irradiation pretreatment of a refractory gold concentrate,” in Proc. Int. Symp. On Gold Metallurgy, Salter, R.S., Wyslouzil, D.M., and McDonald, G.W., eds., Winnipeg, Canada, pp. 327–339.
Haque, K.E., 1999, “Microwave energyfor mineral treatment processes-a brief review,” Int. J. Miner. Process., Vol. 57, pp. 1–24.
Hayashi, J.I., Kusakabe, K., and Morooka, S., 1990, “The role of microwave irradiation in coal desulphurisation with molten caustics,” Fuel, Vol. 69, pp. 739–742, June.
Hutchison, C.S., 1974, Laboratory Handbook of Petrographic Techniques, Wiley, New York, pp. 117–119.
Kelly, R.M., and Rowson N.A., 1995, “Microwave reduction of oxidized mineral concentrates,” Minerals Engineering, Vol. 18, No. 11, pp. 1427–1438.
Kingman, S.W., and Rowson, N.A., 1998, “Microwave treatment of minerals—a review,” Minerals Engineering, Vol. 11, No. 11, pp. 1081–1087.
Kingston, H.M., and Jassie, L.B., 1985, “Introduction to microwave sample preparation—theory and practice,” Chapters 2 and 3, ACS Professional Reference Book, Am. Chem. Soc.
McGill, S.L., Walkiewicz, J.W., and Smyres, G., 1988, “The effect of power level on microwave heating of selected chemicals and minerals,” in Mat. Res. Soc. Symp. Proc, Sutton, W.H., et al., eds., Reno Nevada, M 4.6, Vol. 124.
Parkhomenko, E.I., 1967, Electrical Properties of Rocks, Chapter 2 and 3, Plenum Press, New York, pp. 11–160.
Rosenqvist, T., 1974, Principles of Extractive Metallurgy, McGraw Hill, New York, pp. 245–252.
Roussy, G., and Pearce, J.A., 1995, Foundations and Industrial Applications of Microwave and Radiofrequency Fields: Physical and Chemical Processes, Chapters 10, 11 and 12, Wiley.
Rowson, N.A., 1986, “Desulphurisation of Coal by Microwave Energy,” PhD. Thesis, University of Leeds, UK.
Rowson, N.A., and Rice, N., 1990, “Desulphurisation of Coal Using Low Power Microwave Energy,” Minerals Engineering, Vol. 3, No. 3/4, pp. 363–361.
Weis, N.L., ed., 1984, SME Minerals Engineering Handbook, Society of Mining Engineers.
Tarjan, G., 1986, Mineral Processing, Vol. 2.–Concentration, Flotation, Separation, Backup Processes, p. 380, Budapest.
Tinga, W.R., 1988, “Microwave dielectric constants of metal oxides, Part 1 and Part 2,” Electromagnetic Energy Reviews, Vol. 1, No. 5, pp. 2–6.
Viswanathan, M., 1990, “Investigations on the effect of microwave pre-treat-ment on comminution/beneficiation and desulphurisation of coals,” 11th International Coal Preparation Congress, Tokyo, pp. 151–155.
Walkiewicz, J.W., Kazonich, G., and McGill, S.L., 1988, “Microwave heating characteristics of selected minerals and compounds,” Minerals & Metallurgical Processing, Vol. 5, No. 1, pp. 39–42.
Walkiewicz, J.W., Clark, A.E., and McGill, S.L., 1991, “Microwave-assisted grinding,” IEEE Transactions on Industry Applications, Vol. 27, No. 2, p. 239.
Wong, D., 1975, “Microwave Dielectric Constants of Metal Oxides at High Temperature,” MSc. Thesis Univ. of Alberta, Canada.
Xia, D.K., and Pickles, C.A., 1997, “Application of microwave energy in extractive metallurgy, a review,” CIM Bulletin, Vol. 90, No. 1, pp. 99–107.
Zavitsanos, P.D., 1978, “Coal Desulphurisation Using Microwave Energy,” US Patent, EPA/600/7-78/089.
Znamenafikova, I., Lovas, M., Mockovciakova, A., Jakabsky, S., and BrianCin, J., 2005, “Modification of magnetic properties of siderite ore by microwave energy,” Separation and Purification Technology, Vol. 43, pp. 169–174.
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Paper number MMP-06-056. Discussion of this peer-reviewed and approved paper is invited and must be submitted to SME Publications Dept. prior to Feb. 29, 2008.
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Can, N.M., Bayraktar, I. Effect of microwave treatment on the flotation and magnetic separation properties of pyrite, chalcopyrite, galena and sphalerite. Mining, Metallurgy & Exploration 24, 185–192 (2007). https://doi.org/10.1007/BF03403214
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DOI: https://doi.org/10.1007/BF03403214