A Short Review on Hydrometallurgical Recovery of Iridium

Ir is widely used in various industries, including chemical and electronics industry, owing to its high corrosion and heat resistance.The importance of Ir as a catalyst in proton exchange membrane electrolyzers has increased with the growing demand for green hydrogen, necessitating the recycling of secondary Ir sources, particularly owing to the scarcity of Ir and its high cost.Domestic research on hydrometallurgical recovery of Ir is limited in South Korea.This paper reviews international case studies of hydrometallurgical methods for the recovery of Ir from various Ir-containing resources.In addition, the literature concerning overseas PGMs (Platinum Group Metals) refining processes, including Ir separation, is reviewed.