公开(公告)号：WO1993021479A1

公开(公告)日：1993-10-28

申请号：PCT/US1993003574

申请日：1993-04-12

Applicant: COLUMBIA VENTURES CORPORATION

Inventor： COLUMBIA VENTURES CORPORATION ,  MORGENTHALER, George, W. ,  STRUTHERS, Jeffery, L. ,  CARTER, George, W.

IPC: F23G07/04

CPC classification number: A62D3/19 ,  A62D2101/20 ,  A62D2101/26 ,  A62D2101/28 ,  A62D2101/40 ,  A62D2101/45 ,  A62D2101/47 ,  A62D2101/49 ,  A62D2203/10 ,  C01B7/191 ,  C03B5/005 ,  C03B5/025 ,  C03C1/002 ,  C04B18/026 ,  C04B32/005 ,  F23G5/085 ,  F23G2204/201 ,  Y02E20/12 ,  Y02P40/52 ,  Y02P40/59 ,  Y02W30/91 ,  C04B18/0463

Abstract: 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.