浮選法における鉱粒と気泡の接着機構について (第2報)

Abstract

In flotation, hitherto, the non-polar (hydrophobic) part of mineral has been principally studied for it's floating phenomenon. But according to the writer's opinion, the polar (hydrophilic) part plays an important role as well as the nonpolar part. And also, while the sikn flotation depends only upon the non-polar part of mineral, in the froth flotation the polar and non-polar part operate hand in hand to make up it's characteristic feature.These are based upon the following results.1. The supporting force at the bottom interface of bubble in water is proportional to the contact angle θ of the metal specimen, just as at the free surface of water, but at the upper interface of bubble it is inversely proportional to e, and both supporting forces are almost equal when θ is 90°2. At the upper interface of bubble, the supporting force to gravity is inversely proportional to θ as above-mentioned, but to buoyancy it is prbportional to θ of the wooden specimen. After all it may say that, the mineral in the bubble interface, clings to the bubble by the hydrophobic part when the mineral moves outwards (to water phase) from, it's equilibrium point in proportion only to e at the interface, and by the hydrophilic part when moves inwards (to gas phase), and each acting force is within the limits of WAS.A, WAS.L, according to the equation (1), (2).3. The mineralized bubble at the surface of water is stable when θ is less than 90°, but it is unstable when θ is nearly 90° or over, which shows the upper limit of contact angle of minereal in flotation is about 90°.