Slope and Overvoltage Coefficients for the Calculation of PFC Emissions From Aluminum Production

Technology CF 4 slope coefficient [(kg CF 4 /metric ton Al)/(AE-Mins/cell-day)] CF 4 overvoltage coefficient [(kg CF 4 /metric ton Al)/(mV)] Weight fraction C 2 F 6 /CF 4 [(kg C 2 F 6 /kg CF 4 )] Center Worked Prebake (CWPB) 0.143 1.16 0.121 Side Worked Prebake (SWPB) 0.272 3.65 0.252 Vertical Stud Søderberg (VSS) 0.092 NA 0.053 Horizontal Stud Søderberg (HSS) 0.099 NA 0.085 [75 FR 79156, Dec. 17, 2010]