A procedure for the recovery of valuable components of aluminum insulation used in an aluminum reduction cube. (Machine-translation by Google Translate, not legally binding)

摘要

A process for the recovery of valuable components of alumina insulation used in an aluminum reduction tank comprising the operations of grinding the insulation used, subjecting the employed insulation to dry steam at a pressure in the range of 1 to 7 kg/cm2 and a temperature of 120 to 175ºC in a pressure vessel for a sufficient time to effect the substantially complete decomposition of the contained carbides and nitrides and to add the partially hydrated alumina insulation material to the electrolyte of an aluminum reduction vessel without further treatment whereby the alumina and fluoride content of the alumina insulation used is recirculated. (Machine-translation by Google Translate, not legally binding)