Silicon recovery from Si sawing waste through slag refining

Recycling Si from Si sawing waste is a good approach aiming at meeting the rapidly increasing demand for Si, and the separation of Si and SiC particles plays a key role in the production of high-quality Si. In this work, Si was successfully recovered from Si sawing waste by using a CaO–51mol%SiO2–15mol%MgO slag. This recovery included measurement of the contact angle between a CaO–SiO2–MgO slag and SiC using the sessile drop method. The results, θSiC/SiO2–CaO–MgO