Abstract

Hydrothermal processing of materials covers a wide range of technologies related to the preparation of materials in a closed system under the action of temperature and pressure. The hydrothermal materials processing deals with the hydrothermal synthesis, crystal growth of both fine-to-ultrafine crystals and bulk crystals, leaching, treatment, alteration, sintering, decomposition, waste recycling, supercritical water oxidation, stabilization, mineral recovery, etc. A state of art development in the field of hydrothermal technology has been described with respect to the preparation of both inorganic and organic materials with appropriate examples, eg, growth of quartz single crystals, preparation of zeolites, ceramics, issues related to the environmental science, and a recent approach, such as green processing.