PROCEDE DE TRAITEMENT DE REJETS GAZEUX D'UNE UNITE DE FABRICATION D'UNE PREFORME DE FIBRE OPTIQUE POUR RECUPERATION DE GERMANIUM

摘要

In an optical fiber preform production waste gas treatment process, germanium is precipitated from a liquid, formed from the waste gas, by adding magnesia (MgO). Preferred Features: The waste gas, containing germanium tetrachloride (GeCl4), is reacted with caustic soda to form a liquid waste containing germanium and hypochlorite, the latter being reduced by formic acid addition.