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It has been found that titanium dispersed in fused salts can be deposited on other metals, especially on copper and iron. l%r example, if a piece of copper sheet is placed in close proximity to a titanium sheet (but not in actual contact) and then the whole is immersed into a fused salt, preferably NaC1 or KC1, titanium will transfer to the copper sheet. The thickness of the titanium layer on the copper increases with temperature and time, approaching a maximum thickness of 0.001-0.007 in. (0.025-0.178 mm). Titanium forms a coherent layer on the metals mentioned and protects them from corrosion. The substrate can be dissolved from the reverse side (Fe in FeC13, Cu in HNO3) ; the titanium coating remains.The mechanism of titanium transfer is thought to consist of, first, a titanium pyrosol formation, and then the deposition of these titanium particles upon the other metals forming a titanium rich alloy. Similar behavior has been observed for other metals.

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It is well knotvn that particle size imposes limitations upon flotation, but despite the economic significance of this relationship, it has not been investigated by many wOrkers. Obviously, the maximum size of particles that can be floated is limited by the lifting power of the surface forces (5). It has been shown, also, that in the flotation of sulfide particles the ease of flotation decreases with decreasing particle size (6, 7, 8, 9). Thus, particles of a size near the maximum that can be floated should have the optimum floatability.