Analysis of the electrolytic precipitation rate of calcite

Abstract

A high-frequency electrolysis method was used to reduce the calcium in circulating water by precipitating CaCO₃ on the electrodes. The oxidation-reduction potential, pH, and chemical composition were measured during the precipitation of the CaCO₃. The calcite precipitated on the electrode cover. The concentration of calcium ions in the solution decreased under reducing conditions, and the precipitation rate of calcite depended on the pH. For initial Ca and HCO₃ concentrations of 200 ppm, the maximum precipitation rate of CaCO₃ was 2.4 mg/m²/s at pH = 6.8, and the precipitation rate decreased linearly as the pH decreased to pH = 4.6. The precipitation rate depended on the initial concentrations of calcium and HCO₃, rather than being regulated by the initial pH using citric acid.