Thermodynamic Modeling of Copper Ore Processing Into Matte Using Borate Ores

Using full thermodynamic modeling, the effect of boron anhydride and borate ore on the processes of pelletizing, drying, roasting of copper ore concentrates, and matte production was investigated. It was found that the use of BO is expected to increase the strength of wet pellets due to the formation of boron anhydride crystal hydrates (HBO), which bind ore particles. During drying, the hydrate loses water at 285 K, turning into boron anhydride, which melts at 723 K during roasting, forming a liquid phase. Upon cooling, this phase creates a solid sinter together with other ore components. Metallurgical processing of such boron-containing material is predicted to improve process performance and reduce matte losses due to the formation of low-viscosity, highly mobile furnace slags.