Three-Phase Contact Formation and Flotation of Highly Hydrophobic Polytetrafluoroethylene in the Presence of Increased Dose of Frothers

被引：31

作者：

Kowalczuk, Przemyslaw B. ^{[1
]}

Zawala, Jan ^{[2
]}

Kosior, Dominik ^{[2
]}

Drzymala, Jan ^{[1
]}

Malysa, Kazimierz ^{[2
]}

机构：

[1] Wroclaw Univ Technol, Fac Geoengn Min & Geol, Wybrzeze Wyspianskiego 27, PL-50370 Wroclaw, Poland

[2] Polish Acad Sci, Jerzy Haber Inst Catalysis & Surface Chem, Niezapominajek 8, PL-30239 Krakow, Poland

来源：

INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH | 2016年 / 55卷 / 03期

关键词：

BUBBLE ATTACHMENT; SURFACE-ROUGHNESS; SOLID PARTICLES; ANTIFOAM ACTION; THIN-FILMS; KINETICS; SIZE; INDUCTION; STABILITY; ANGLES;

D O I：

10.1021/acs.iecr.5b04293

中图分类号：

TQ [化学工业];

学科分类号：

0817 ;

摘要：

The time of a single bubble attachment to a rough hydrophobic solid surface with contact angle greater than 90 degrees in aqueous solutions at different frothers (n-octanol, alpha-terpineol and N-octyl-trimethylammonium bromide) in the concentration ranges of 10(-6) to 10(-3) M was compared with flotation performed under corresponding conditions. A relationship between the time of three-phase contact (TPC) formation at the bubble/liquid/solid interface and flotation rate was obtained. It was found that above a certain frother dose, irrespective of frother type, one could observe significantly longer bubble solid surface attachment time, which increases from about 2 ms to above 50-60 ms for higher frother concentrations. Accordingly, the flotation rate for the corresponding frothers concentrations decreased from ca. 0.8 s(-1) to values below 0.01 s(-1). The obtained results confirm that air can be entrapped at rough highly hydrophobic solid surfaces and show the importance of the bubble attachment time for the flotation kinetics.

引用

页码：839 / 843

页数：5

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