Use of the hydrogen-volatile-matter ratio in obtaining the net heating value of American coals - Softcover

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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1918 Excerpt: ...the proper equilibrium for successful flotation, and that the surface tensions of the oils, which directly involve their surface energies, are decidedly susceptible to the various conditions that exist in the pulp. It is seen that nearly any substance present in a flotation pulp may affect more or less the surface-energy equilibrium of the oils, water, and minerals. The question of the oils upsetting the surface-energy equilibrium of the flotation pulp and retarding the flotation of the sulphide minerals will now be considered in more detail. SURFACE RELATION OF WATER AND OILS. As has been shown, the oils have two functions in flotation: To furnish a soluble constituent that will reduce the surface tension and produce froth, and to furnish an insoluble element that will, under the proper conditions, coat the sulphide particles. This brings in another complication, the equilibrium between the surface energy of the water and that of the minerals. As has been mentioned, water when pure is in the best condition for not being adsorbed by sulphide particles. This can be shown by laying a piece of pure mineral on the surface of pure water; the water will not wet the sulphide. Seemingly, therefore, the equilibrium existing between pure water and the sulphide mineral is close to the correct surface-energy relation to produce good flotation results. If the assumption that the best condition for flotation is when the mineral is not wetted by the water is true, then in order to get good flotation the relations of the water and the mineral must be changed only in such a way that the resultant of the surface energy of the water and that of the mineral will be the same after the modification as before. In other words-if one of these two phases of the flotation process is ...

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