B., GOVINDARAJAN and T.C., Rao and M., VANANGAMUDI (1991) An Empirical Model for Batch Coal Flotation. Coal Preparation. pp. 3-4. ISSN DOI:10.1080/07349349108960564

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Abstract

Results obtained from batch flotation experiments on seven coal samples, having widely varying size and size-wise ash distributions have been used to develop a simple empirical model for predicting the performance through first order kinetic behaviour. The kinetic equation describing the variation of recoveries of non-ash and ash materials with flotation time is given as R = R∞ The first order rate constant (kN ) and the equilibrium recovery (Rn∞ for the recovery of non-ash material are related to the weight percents of non-ash materials present in the coarse fraction above 75 μ m (CNA) and in fines fraction below 75 μ (FNA) in the feed, collector dosage (C) and frother dosage ( F) by the equation: kN = A (CNA)1.069 (FNA) − 0.083 (C) 0.083(F) 0.045 RN∞ = B (CNA)0.407 (FNA)-− 0.0061 (C) 0.172 (F) 0.126 Similar relationships have been noted for rate constants and equilibrium recovery (kA and RA∞ respectively) of ash material also Four characteristic constants have been identified which would describe the feed coal characteristics for any coal. One experiment has to be carried out on a given coal sample at known levels of reagent dosages to estimate these constants and using these constants, the yields and ash content of the concentrates obtained at any other conditions can be estimated with the help of equations developed. The model developed has been found to predict the flotation performance very satisfactorily

Item Type:	Article
Subjects:	Material/Component Development, Processing and Characterization
Divisions:	UNSPECIFIED
Depositing User:	Mr. B.K. Prasad
Date Deposited:	14 Aug 2013 10:23
Last Modified:	14 Aug 2013 10:23
URI:	http://ampri.csircentral.net/id/eprint/381

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