The addition of SiC did not cause any increase in impurities. Rather, it resulted in an improvement of the reaction kinetics in the temperature region of 350–400 °C, prob- ably as a result of better heat transfer in the reactant owing to the high thermal diffusivity of SiC. This demonstrates that the bro- minating reaction is effective to extract pure silicon from kerf loss waste even where SiC is present. Yoko et al. [31] proposed a new methodology for recovering silicon from oily wastes from silicon ingot cutting using supercritical water in a semi-batch reactor. The silicon recovered using the proposed methods (at 500 °C and
25 MPa) was approximately 99.2% pure.