Determination of the critical surface tension of wetting of minerals treated with surfactants by shear flocculation approach

Comparison of stages in oil agglomeration process of quartz with sodium oleate in the presence of Ca(II) and Mg(II) ions

“…As seen in Table 1, while the small contact angles were measured at pH 9, the contact angle values reached high values at pH 11. These results confirm the importance of surface hydrophobicity in the shear flocculation process, as also indicated in the literature [6,20,29,30]. On the other hand, the shear flocculation efficiency values decreased in the presence of both cations at pH values higher than 11.…”

Critical solution surface tension for oil agglomeration

“…The effect of solution surface tension on the shear flocculation of the same calcite and barite minerals Table 2 The c c values of sulfur, coal, calcite and barite obtained from the contact angle measurement, flotation and shear flocculation methods (Ozkan and Yekeler, 2003;Ozkan, 2004) Fig. 6.…”

“…One of these quantifying parameters mentioned above is the critical surface tension of wetting (c c ) values to achieve selectivity in surface chemistry processes (Yekeler and Yarar, 1994a). Contact angle measurement, flotation, immersion time, bubble pickup, film flotation, automatic wetting balance, modified Hildebrand-Scott equation or shear flocculation methods can be used alternatively for determining the c c values of solids or minerals (Shafrin and Zisman, 1960;Yarar and Kaoma, 1984;Garchva et al, 1978;Sun and Troxell, 1957;Williams and Fuerstenau, 1987;Rosano et al, 1971;Wu, 1968;Ozkan, 2004). The Zisman contact angle measurement technique and the flotation method are the two major techniques used to determine the (c c ) values of minerals among these experimental and empirical techniques (Kelebek, 1987;Yarar, 1988;Yekeler and Yarar, 1994a,b).…”

“…The shear flocculation method to determine the critical surface tension of wetting of minerals treated with surfactants was devised recently by Ozkan (2004). As seen in Fig.…”

Evaluation of Critical Parameters for Wettability-Based Processes in Mineral Processing

“…By using this property, the shear flocculation method as a new approach to determine the critical surface tension of wetting of minerals treated with surfactants was contributed by Ozkan [21]. This approach is presented in Figure 3 and no effective shear flocculation takes place at  c  LV while the effective shear flocculation of mineral suspension occurs at  c < LV .…”