浮選における粒子に作用する支持力について

抄録

The suspension of particles in froth flotation is classified into two types, one of which is by air bubbles in the pulp, and the other is by liquid film in the froth layer. The formulae of supporting force in both cases were investigated and verified by some experiments.
The results obtained are as follows:(1) On the supporting force in the pulp, Momosaki's equation was confirmed by the correlation of contact angle to the maximum supporting angle by the experiments on some cylindrical samples and different solutions. Results of the skin flotation on the sized fluorite grains also verified the above conclusion.(2) An equation was proposed as the supporting force in the froth layer tor the large cylindrical sample, neglecting the thickness of liquid film. f=2πd·T·sinΘ where f: supporting force, d: diameter of cylinder, T: surface tension, Θ: supporting angle.
This equation was found to be correct on the basis of the results of the experiments obtained on cylindrical samples. The maximum supporting force did not relate to the contact angle, due to the fact that the maximum supporting angle was always obtained at 90°.
(3) The floating experiments, using 0.5g/l sodium oleate solution and sized sample of quartz (contact angle=0°), and fluorite (35°), in the froth layer, also proved the item (2). For very fine particles (-200 mesh), however, the effect of contact angle appeared and spraying of solution (the increase of film thickness) helped this tendency.