LAUSR

The aluminum spent cathode carbon block (SCCB) is defined as a hazardous material because it contains soluble fluoride and toxic cyanide compounds. To make the SCCB harmless, it has been proposed to separate the carbon and fluoride salts using a high-temperature resistance furnace. To evaluate the temperature distribution and heat transfer of the furnace, the effective thermal conductivity of SCCB was calculated by numerical simulation, and the results were compared with fundamental structural models. After considering the radiative heat transfer, the effective thermal conductivity of SCCB increased as the temperature increased. When the high-temperature resistance furnace was heated for 10 h under two conditions, considering radiation at the monitoring point, the temperature was found to be 61°C higher than that without considering radiation. Moreover, the volatilization rate of fluoride salts of the two models differed by 15.6%. This indicates that the temperature distribution in the furnace is uniform when the radiation effect is included.