In order to recover indium, while preventing generation of chlorine gas, by a direct electrowinning method from a hydrochloric acid solution from which impurities have been removed by various chemical purification methods, an electrolysis is carried out by using an indium-containing hydrochloric acid...http://www.google.co.uk/patents/US5543031?utm_source=gb-gplus-sharePatent US5543031 - Method for recovering indium by electrowinning and apparatus therefor
