浮選に関連した二, 三の濕潤現象について

抄録

In the former reports, analysing the molecular structure of both the typical hydrophobic minerals (natural floaters) and hydrophilic minerals, the author extracted a characteristic common to each group; covalent bond and Van der Waals (London) bond to the hydrophobic and electrostatic bond to the hydrophilic. And on the basis of this, the mechanism of wettability was deduced.(1) The hydrophobic mineral surface have the Van der Waals (London) force field, that is, the dispersion force field, where as the hydrophilic surface have the electrostatic field.(2) As the dispersion force field may be replaced by the high (ultra-violet) oscillating electric field, there is no interaction between the dispersion force field and. the electrostatic field ; this leads to “non-wettable”. But there exist the distinct interactions between the hyd-rophobic mineral surface and non-polar liquid; the dispersion force, and between the hydrophilic mineral and polar-liquid; the electrostatic force. These lead to “wettable”.
This report gives the following supplements on Wettability.
(1) Though the Weyl's theory on wettability is different from the.author's, these two have, in a sense, the close connection with each other.
(2) As one of the application of the author's theory, it was tried to explain the mechanism of emulsifiers for the type of emulsion (water in oil or oil in water type).
(3) In the flotation. tests of talc and pyrophillite, it was shown that there was the distinct correspondence between changes of crystal structure by heating and floatability (wettability).
Considering the mechanism of wettability as mentioned above, the attachment of bubble to hydrophobic mineral in flotation is smoothly explicable through the dispersion force, which will be discussed in the next report.