Floatation rates

Sawai et al. (1996) and Wakoh et al. (1992) proposed a concept to obtain a fine ferrite grain structure utilizing MnS as the nucleant. That is, the combination of two types of oxides one in which a uniform distribution and very fine particles can easily be obtained, and another on which MnS easily precipitates. Ueshima et al. (1989) found that the number of oxide inclusions formed in the steels is larger in Hf-, Ce-, Y- and Zr-treated steels than those in Al- and Ti-treated steels, but the difference in the size of the inclusions is not large (fig. 12a,b), when these elements are added to molten iron in the same concentration. They interpreted the differences in these results due to the difference in the floatation rates U (fig. 13) of these oxides in molten iron by the following Stokes equation. That is, it is concluded that many of the oxide particles with a larger density... 

Fig. 13, Calculated floatation rate of various oxide particles in molten iron.

TABLE S - MEASURED AND PREDICTED FIRST-ORDER RATE CONSTANTS FOR FLOATATION DATA AT tO.O wt% NaCI... 

The solid loading rate (SLR) is characterized by dividing mass flow rate of oil stream by available surface area of the floatation unit. The recommended SLR value is ranged from 4 to 10 kg/m h (45). The optimum SLR value is dependent on numbers of other operating conditions. 

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