ALEXANDRIA, Va., June 6 -- United States Patent no. 12,281,372, issued on April 22, was assigned to BETOLAR OYJ (Kannonkoski, Finland).
"Method and system for ash treatment" was invented by Jorma Jokiniemi (Vantaa, Finland), Daniel Lane (South Australia, Australia), Anna Lahde (Toivala, Finland) and Olli Sippula (Kuopio, Finland).
According to the abstract* released by the U.S. Patent & Trademark Office: "A method of the invention for treatment of particulate material for metal recovery includes heating a furnace to a first temperature, feeding a particulate material into the furnace, and before or after heating of the raw material, feeding a reducing gas flow through the furnace. The particulate material is heated in the furnace for vola...