Hydrothermal Oxidation of Zinc Metal

Abstract

Reactions of a Zinc metal powder with high temperature-high pressure water were studied under 100MPa. All of Zn powders changed into ZnO above 300°C within 1h in a closed system and also rapidly changed during heating upto 400°C in an open system. Zinc powder particles were disintegrated during the reaction due to volume increase in oxidation. The crystallite size of ZnO remained almost constant at 200°C, but increased with time above 300°C. The crystal growth of ZnO was observed in the open system.