Quartz sand is a mineral mainly composed of silicon dioxide (SiO2), which has the characteristics of high hardness, uniform particles and high temperature resistance. In the process of frying chestnuts, using quartz sand as heat transfer medium can transfer heat evenly, so that chestnuts are heated evenly and the fried chestnuts taste better. Quartz sand also has good stability and high temperature resistance, and will not melt or produce harmful substances due to high temperature. Therefore, it is widely used in the process of frying chestnuts to improve the effect and taste of frying chestnuts.