1887

Abstract

Summary

The deposition of inorganic matters onto rock surfaces emanates from the interfacial interactions present in the scale/brine/rock system. Accordingly, the experimental work of this study investigates the incompatibility of the cationic and anionic brines with/without dolomite rock at elevated temperature. For doing so, the anionic brine included 6500 ppm ?SO?_4^(2-) is mixed with three different cationic solutions which possess 3000, 6000 and 9000 ppm ?Ca?^(2+), respectively. The observed findings imply that more gypsum deposits are obtained with increasing the salinity of the mixed brines. The same trend is also observed for the understudy system containing dolomite rocks. The outcome of the simulating geochemical software (PHREEQC) validates the experimental observations. However, incomplete dissolution and non-equilibrium conditions can be sought to address the difference between experimental and simulated consequences. From theoretical stand point of view, the extended DLVO theory states that the Lewis acid-base interaction energy dominates the intermolecular interactions in the gypsum/brine/dolomite system which otherwise shows reasonable agreement with the observed results. In other words, the behavior of the system can be rationalized through polar intermolecular interactions rather than dispersion.

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/content/papers/10.3997/2214-4609.202053111
2020-11-16
2024-04-26
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