選鉱過程におけるマイクロプロセスについて (1)

Abstract

Some processes in mineral processing contain several kinds of micro-processes that mean microscopic phenomena e.g. in flotation process the thinning process of the liquid film between an air bubble and the mineral particle or the turbulent motion and the collision of mineral particles with air bubbles. In this review, however, micro-processes have been defined as processes produced by turbulent transport phenomena.The studies about the micro-processes have been recently developed and progressed. Then the micro-processes contained in the typical three unit operations, that is flotation, classification and thickening processes were reviewed. But a process can not consist of only micro-processes and it contains macroscopic processes. Then in this review at first the macroscopic hydrodynamic researches for the flotation process were summarized. The microscopic hydrodynamic studies for the flotation process were secondly reviewed.In this section methods of the measurement of turbulent characteristics were described especially about electrode reaction methods and image sensor methods. Then the turbulent characteristics, that is fluctuating velocitiesenergy spectra were explained in order to analyze the micro-processes. Kolmogoroff's the ry has bee, nv aellsooc iatpyp clioerdre tloa tsioonlvse athned problems of dispersion of air bubbles or detachment of mineral particles from air bubbles since the turbulent fields in flotation machines can be regarded as at least locally isotropic turbulent fields.(to be continued)