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Effect of calcium ion and montmorillonite clay on bitumen displacement by water on a glass surface

机译：钙离子和蒙脱土对玻璃表面水置换沥青的影响

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摘要

Experiments were conducted to study the effect of calcium ion and montmorillonite clay on bitumen displacement by an aqueous phase on a glass surface. Upon exposure to an aqueous environment containing calcium ion and clays, a thin coating of bitumen on a glass surface displaced spontaneously in the inward radial direction. The initially circular bitumen disk took the shape of a spherical droplet. The dynamic and static contact angles of bitumen on the glass surface were estimated by measuring the contact radius of bitumen with time. The dynamic and static contact angles in the presence of calcium ion and clays are compared with the case when no calcium ion and clays are present. At pH 9, the static contact angle decreased significantly in the presence of calcium ion having a concentration higher than 25 ppm. For a given temperature and at a pH of 9, the initial dynamic angle variation with time was affected less by the presence of clays than with the case of calcium addition. There was no synergetic effect on the dynamic and static angles due to the presence of both calcium ion and clays. In the presence calcium and clays, the results would suggest a negative impact on bitumen liberation from sand grains in the industrial process of bitumen extraction from oil sands. In all cases, the contact angle is measured through the bitumen phase.
机译：进行实验以研究钙离子和蒙脱石粘土对玻璃表面上水相对沥青置换的影响。当暴露于含有钙离子和粘土的水性环境中时，玻璃表面上的沥青薄涂层会自发地向内径向移动。最初的圆形沥青盘呈球形液滴的形状。通过测量沥青随时间的接触半径来估算沥青在玻璃表面上的动态和静态接触角。将钙离子和粘土存在下的动态和静态接触角与不存在钙离子和粘土的情况进行了比较。在pH值为9时，如果存在浓度高于25 ppm的钙离子，则静态接触角会大大降低。对于给定的温度和9的pH值，初始动态角随时间的变化受粘土的存在的影响比添加钙的影响小。由于存在钙离子和粘土，因此对动角和静角没有协同作用。在存在钙和粘土的情况下，该结果表明在从油砂中提取沥青的工业过程中，对从砂粒中释放沥青具有负面影响。在所有情况下，接触角都是在沥青阶段测量的。

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