Modelling of single flotation column stages and column circuits

Abstract A procedure for modelling single flotation columns and column circuits is described. In general terms, column models comprise three key components or expressions, to describe particle/bubble attachment, axial dispersion in the pulp zone, and net detachment in the froth zone. Previous models of these components are reviewed. In the current study, each column unit or stage is represented by a single zone model. Mineral recovery from each stage is related to a first order rate parameter and a residence time distribution. Based on experimental evidence and theory, an improved expression for the rate parameter is proposed. The model parameters are back-calculated from or fitted to experimental data. In this paper a number of model fitting examples are presented, these include single columns and column circuits. In the circuit examples, the mineral specific parameters are related to the properties of the feed, rather than to the operation of individual column stages. Consequently mineral behaviour is separated from column operation and circuit configuration. Mineral behaviour is related to particle size and arbitrary floatability distribution. The relative merits of a number of floatability distributions are examined.

[1]  L. F. Evans.  Bubble-Mineral Attachment in Flotation , 1954 .

[2]  J. Leja,et al.  Physico-chemical elementary processes in flotation , 1985 .

[3]  H. Schulze,et al.  Hydrodynamics of Bubble-Mineral Particle Collisions , 1989 .

[4]  M. Falutsu,et al.  Direct measurement of froth drop back and collection zone recovery in a laboratory flotation column , 1989 .

[5]  R. Yoon,et al.  The Effect of Bubble Size on Fine Particle Flotation , 1989 .

[6]  John Ralston,et al.  The influence of particle size and contact angle in mineral flotation , 1988 .

[7]  Martin E. Weber,et al.  Interceptional and gravitational collision efficiencies for single collectors at intermediate Reynolds numbers , 1983 .

[8]  F. F. Aplan,et al.  Model Discrimination in the Flotation of a Porphyry Copper Ore , 1985 .

[9]  William H. Press,et al.  Numerical recipes , 1990 .

[10]  Jacob H. Masliyah,et al.  ]Hindered settling in a multi-species particle system , 1979 .

[11]  N. Draper,et al.  Applied Regression Analysis , 1966 .

[12]  Michael H. Moys.  Mass Transport in Flotation Froths , 1989 .

[13]  J. Finch,et al.  Particle size dependence in flotation derived from a fundamental model of the capture process , 1987 .

[14]  V. Ross,et al.  An investigation of sub-processes in equilibrium froths (I): the mechanisms of detachment and drainage , 1991 .

[15]  Jan D. Miller,et al.  The significance of bubble/particle contact time during collision in the analysis of flotation phenomena , 1989 .

[16]  James A. Finch,et al.  Evaluation of flotation column scale-up at Mount Isa mines limited , 1989 .

[17]  R. A. Alford.  Improved model for design of industrial column flotation circuits in sulphide applications , 1990 .

[18]  James A. Finch,et al.  A model of particle sliding time for flotation size bubbles , 1986 .

[19]  J. Finch,et al.  Selectivity in column flotation froths , 1988 .

[20]  H. Schulze,et al.  Investigations of the collision process between particles and gas bubbles in flotation — A theoretical analysis , 1989 .

[21]  Jan D. Miller,et al.  Bubble/Particle Contact Time in the Analysis of Coal Flotation , 1988 .

[22]  A. Lynch.  Mineral and Coal Flotation Circuits: Their Simulation and Control , 1981 .

[23]  S. P. Barber,et al.  Effects of froth structure and mobility on the performance and simulation of continuously operated flotation cells , 1986 .

[24]  James A. Finch,et al.  Estimation of Bubble Diameter in Flotation Columns from Drift Flux Analysis , 1988 .