Journal of the Southern African Institute of Mining and Metallurgy
On-line version ISSN 2411-9717
MOHANTA, S. and MEIKAP, B.C.. Influence of medium particle size on the separation performance of an air dense medium fluidized bed separator for coal cleaning. J. S. Afr. Inst. Min. Metall. [online]. 2015, vol.115, n.8, pp. 761-766. ISSN 2411-9717. http://dx.doi.org/10.17159/2411-9717/2015/V115N8A13.
Dry beneficiation of coal by air dense medium fluidized bed is an emerging trend. It is widely believed that the particle size of the medium has a significant effect on the separation efficiency. This investigation demonstrates that medium particle size has a major effect on separation efficiency. Experimental results show that different size fractions of the same feed respond differently to the same size fraction of medium solids. Furthermore, a particular size fraction of feed coal responds differently with different size fractions of medium solids. The Ep values and overall metallurgical performance parameters, obtained from experimental results, clearly indicate the superior performance of an air dense medium fluidized bed separator when using -150+106 μηι magnetite powder as the fluidizing medium. These observations reinforce the importance of sizing the medium particle size for the air dense medium fluidized bed.
Keywords : coal beneficiation; air dense medium fluidized bed; separation efficiency; partition curve.