Abstract
Coal is currently cleaned with a minimum of size reduction; fine particle processing, recovery and tailings disposal are major problems; and adequate water resources are not always available. Two-thirds of China’s coal is located in arid areas. Hence, dry separation provides an alternative approach. Of the dry coal separation methods available, air dense-medium fluidized beds have been used to separate 6- to 50-mm size coal efficiently. However, excessive bubbling and back mixing of the separated solids in the air-dense media fluidized bed results in a high lower size limit of 6 mm for the feed material, which affects the preparation efficiency. Based on a previous study of air-fluidized dense-media for 6- to 50-mm coal preparation, this paper presents methods and test results on the fine coal dry classification, electrostatic beneficiation of 0- to 0.5-mm coal and magnetically stabilized fluidized beds for separating 0.5- to 6-mm coal.
Similar content being viewed by others
References
Brandani, S., and Astarita, G., 1996, “Analysis of the discontinuities in magnetized bubbling fluidized beds,” Chemical Engineering Science, Vol. 51, No. 20, p. 4631.
Chen, Q., Zhang, X., and Fan, M., 1997, “A Kind of Static Electric Coal Separator,” Chinese Patent ZL 972 47418.8.
Cohen, A.H., and Tien, C., 1991, “Aerosol filtration in a magnetically stabilized fluidized bed,” Powder Technology, Vol. 64, p. 147.
Fan, M., Chen, Q., Zhao, Y., and Luo, Z., 2001a, “Fine coal separation in magnetically stabilized fluidized beds,” Int. J. Miner. Process., Vol. 63, pp. 225–232.
Fan, M., Chen, Q., Zhao, Y., Luo, Z., Zhang, X., and Yang, G., 2001b, “Dry classification and separation of 6≈0 mm coal,” Eighteenth Annual International Pittsburgh Coal Conference, Australia, 2001.11, CD-Rom.
Fan, M., Chen, Q., Zhao, Y., Luo, Z., and Beibei, L., 2002, “Magnetically stabilized fluidized beds for fine coal separation,” Powder Technology, Vol. 123, Nos. 2–3, p. 4411
Harel, O., Zimmels, Y., and Resnick, W., 1991, “Particle separation in a magnetically stabilized fluidized bed,” Powder Technology, Vol. 64, pp. 159–164.
Hristov, J.Y., 1996, “Fluidization of ferromagnetic particles in a magnetic field Part 1: The effect of field line orientation on bed stability,” Powder Technology, Vol. 87, p. 59.
Lochmuller, C.H., and Wigman, L.S., 1987, “Affinity separations in magnetically stabilized fluidized beds: synthesis and performance of packing materials,” Separation Science and Technology, Vol., 22, No. 11, pp. 2111–2125.
Rosensweig, R.E., Lee, W.K., and Siegell, J.H., 1987, “Magnetically stabilized fluidized beds for solids separation by density,” Separation Science and Technology, Vol. 22, No. 1, pp. 25–45.
Saxena, S.C., and Shrivastava, S., 1991, “Some hydrodynamic investigating of a magnetically stabilized air-fluidized bed of ferromagnetic particles,” Powder Technology, Vol. 64, p. 57.
Sergeev, Y.A., and Muromsky, M., 1994, “On propagation of concentration disturbances in a magnetically stabilized fluidized bed,” Int. J. Multiphase Flow, Vol. 20, No. 5, p. 27.
Siegell, J.H., and Pirkle, J.C. Jr., (1984–1985), “Crossflow magnetically stabilized bed chromatography,” Separation Science and Technology, Vol. 19, Nos. 13–15, pp. 977–993.
Tuthill, E.J., 1969, “Magnetically stabilized fluidized beds,” U.S. Pat. 3,439,899.
Wu, W.Y., Smith, K.L., and Saxena, S.C., 1997, “Rheology of a magnetically stabilized fluidized bed consisting of admixtures of magnetic and nonmagnetic particles,” Powder Technology, Vol. 91, p. 181.
Yang, G., Chen, Q., Fan, M., and Tao, X., 1999, “Flow and residence time distributions of materials in hot gas penetrating vibrated bed,” Journal of China Coal Society, Vol. 24, No. 3, June.
Zhao, Y., Chen, Q., Fan, M., and Hong, J., 1998, “Development and application of the QGS2020 type piano-wire probability screen,” Powder Technology, 1998, Vol. 100, No. 1, p. 80.
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Fan, M., Chen, Q., Zhao, Y. et al. Fine coal dry classification and separation. Mining, Metallurgy & Exploration 23, 17–21 (2006). https://doi.org/10.1007/BF03403330
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1007/BF03403330