This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1917 edition. Excerpt: ...facts. The true parallelism has been known for years, and was outlined by T. J. Hoover in his book, 'Concentrating Ores by Flotation.' It is this: that minerals which tend to float are those in which the greatest hysteresis is observed in the value of the contact-angle. Since repeated experiments have ...
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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1917 edition. Excerpt: ...facts. The true parallelism has been known for years, and was outlined by T. J. Hoover in his book, 'Concentrating Ores by Flotation.' It is this: that minerals which tend to float are those in which the greatest hysteresis is observed in the value of the contact-angle. Since repeated experiments have proved this to be true, we must look for an explanation of why this hysteresis, or its causes, should also be connected with adhesion to air-bubbles in a froth. H. Hardy Smith, M. & S. P., July 1, 1916. H. Livingstone Sulman, Trans. I. M. & M. Bull. 79 (April 19, 1911). When a mineral particle under water comes into contact with a bubble of air (see Fig. 8) it might appear that the dense surface-films of liquid surrounding each would keep the air from getting into actual contact with the mineral. C. Terry Durell has gone so far as to say that this contact absolutely cannot take place,5 but experiments such as were described earlier in this paper cast considerable doubt on the accuracy of his stand. A consideration of the surface-tensions in volved, however, will not account for a rupture of the films, since in the parallelogram in Fig. 8, the resultant of Tg and Ts can never exceed their sum. Since it may be difficult to draw a clear mental picture of what happens when a solid particle and a bubble meet, let us consider what happens when two air-bubbles meet. See Fig. 9. If two air-bubbles submerged in water impinge against one another, a thin and probably flat film of water will be left separating them--at least momentarily. This film will have typical surface-layers on either side. If the water is pure, this film will not be stable, since the surfacetension will be constant, and the upper part of the film will have to support not...
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