Plasma torch processing of spent aluminum smelter potliner

Details Plasma torch processing of spent aluminum smelter potliner Plasma torch processing of spent aluminum smelter potliner

B - Operations, Transporting

09

B

B09B 3/00 (2006.01) C01B 7/19 (2006.01) C03B 5/00 (2006.01) C03B 5/02 (2006.01) C03C 1/00 (2006.01) C04B 18/02 (2006.01) C04B 32/00 (2006.01) C25C 3/06 (2006.01) F23G 5/00 (2006.01) F23G 5/08 (2006.01) A62D 3/00 (2006.01)

Patent

CA 2118003

2118003 9321479 PCTABS00027 Spent potliner (SPL) from aluminum reduction cells includes carbbon, inorganic brick and refractory material, and fluoride, sulfur, and cyanide compounds, and is considered hazardous. It is treated by introducing it into a vessel (14) and exposing it to the heat of a plasma torch (12) at a temperature of at least 1000 ·C. As a result, carbon is gasified and converted to combustible carbon monoxide or hydrocarbons, or to carbon dioxide; inorganic material is melted to form slag; fluoride compounds are melted, vaporized, or reduced to gaseous HF; cyanide compounds are destroyed; and all other materials, including sulfur compounds, are either melted or gasified.

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