Title: Molten Fayalite Modification Using Intrinsic Latent Slag Heat During Pouring
Authors: Mutalibkhonov S.S.
Volume: 10
Issue: 7
Pages: 94-107
Publication Date: 2026/07/28
Abstract:
In this study, a synergistic internal modification method based on Na2CO3+CaCO3 was proposed for processing liquid copper smelting slag. The process is carried out based on very low-carbon technology at temperatures of 1180-1280 °C, directly at the stage of pouring the slag into the bowl, eliminating the traditional slow cooling and grinding stages. Na2O and CaO, formed as a result of the thermal decomposition of carbonates, depolymerize the silicate chain, break down the structure of fayalite (Fe2SiO4), and enhance the separation of metal phases. Thermodynamic analysis confirms that reactions occur spontaneously (?G < 0). Kinetic results show that the activation energy decreases to 38.7 kJ·mol-1, and the flotation half-life is ~15 s. Under optimal conditions, the copper recovery rate increases from 62-65 % to 95-98 %. Additionally, viscosity decreases by 40-45 %, and the rheological properties of the slag significantly improves. The proposed method is an energy-efficient, environmentally sustainable, and innovative technology that aligns with the principles of a circular economy.