The major sources of emissions from scrap pretreatment processes are scrap crushing and
screening operations, scrap driers, sweat furnaces, and UBC delacquering systems. Although each step
in scrap treatment and smelting/refining is a potential source of emissions, emission factors for scrap
treatment processes have not been sufficiently characterized and documented and are therefore not
presented below.
Smelting and refining emission sources originate from charging, fluxing, and demagging
processes. Tables 12.8-1 and 12.8-2 present emission factors for sweating furnaces, crucible furnaces,
reverberatory furnaces, and chlorine demagging process.