The loss of stability of the wetting water films on the quartz surface with increasing temperature was found. It is assumed that this is due to the temperature dependence of the structure of water in the wall layer. Based on the results of measuring the contact angle of wetting, the calculation of the parameter characterizing the magnitude of the structural forces was carried out. The inversion of the parameter sign is associated with the predominance of the forces of hydrophobic attraction over the forces of hydrophilic repulsion in a certain temperature range. The results of deferrization of glass quartz sands by flotation under temperature action on wetting water films are presented.
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