The complex effect of organic acids on the dissolution of feldspar at high temperature

To understand the effect of organic acid on the solubility of feldspar under high temperature conditions, feldspar dissolution experiments in oxalic acid and in acetic acid were conducted at 130 °C. And the Gaussian simulation software was used to calculate the binding energy of the complex reaction from the perspective of quantum chemistry to analyze the relationship between the binding energy and the corrosion amount. The results showed that the dissolution of feldspar in oxalic acid was obviously more intense than that in acetic acid at the same temperature. The average dissolution rates in oxalic acid and in acetic acid were 4.30 × 10−10 mol m−2 s−1 and 3.04 × 10−10 mol m−2 s−1, respectively. SEM and EDS results showed that the phenomenon of oxalic acid corroding feldspar is more obvious than that of acetic acid corroding feldspar, and the secondary minerals produced were also different. The Gaussian calculation results indicated that oxalic acid was more easily complexed with silicon ions and aluminum ions than acetic acid, which was consistent with the experimental results that oxalic acid had better corrosion ability to feldspar than acetic acid.