A process is disclosed for regenerating spent MgO-vermiculite and MgO-perlite sorbents, where the sorbents have been employed beforehand to remove sulfur and nitrogen oxides from flue gases. The regeneration process consists of a series of heating and cooling steps performed in controlled atmospheres...http://www.google.com.au/patents/US4829036?utm_source=gb-gplus-sharePatent US4829036 - Regeneration process for spent SO.sub.2 -NO.sub.X sorbents
