几种常见矿物的油-水-矿物接触角测量及其讨论

采用测量水中油滴在矿物表面接触角的方法，利用接触角测量仪测量了不同矿化度水中，不同单组分油和混合组分油在不同矿物表面的接触角，提出了一套合理的测量方法，保证了测量结果的准确性。经过测量润湿角的大小，对比发现水中矿物的亲油性由强到弱依次为：云母＞黄铁矿＞方解石＞白云石＞石英。矿物类型、油组分类型和水的矿化度都对接触角有较大影响：不同的矿物表面油水的润湿性不同；随着油滴中正十八烷含量的增多，油滴在云母表面的接触角变小，润湿性变好，在其它矿物表面的润湿性略有不同；随着水矿化度的提高，油滴在云母表面的接触角呈现出明显变大的趋势，润湿性逐渐变差，在其它矿物表面的润湿性略有不同。

Measurement and Analysis of Oil water Contact Angle on Several Common Minerals

In this paper, the contact angles of oil droplets on mineral surface were determined using contact angle measuring instrument. The contact angles of different oil types in different mineralizing water and different component oil and mixed component oil were measured. We proposed a reasonable measurement method to maximize the measurement result accuracy. After measuring the size of the wetting angle, it is found that the lipophilicity of the minerals in the water vary from strong to weak: mica>pyrite>calcite>dolomite>quartz.The type of mineral, oil composition type, water mineralization degree all impose significant influence on the contact angle, and the wetting of oil and water on different mineral surfaces is different. With increasing octadecane content of the oil droplets, the contact angle of the oil droplets on mica surface decreases and the wettability increases. The surface wettability is slightly different on the surface of other minerals. With increasing water mineralization, the contact angle of oil droplets on mica surface increases and the wettability decreases gradually, and the wettability on other mineral surface is also slightly different.