Inputs and Outputs of the Coke Making Process

Inputs

Coal

Heat (from coke oven gas, blast furnace gas, natural gas) Electricity Water

Outputs

Coke

Coke oven gas and byproducts including coal tar, light oil, and ammonia liquor Ammonia, phenol, cyanide, and hydrogen sulfide Charging, pushing, and quenching emissions Products of combustion (SO2, NOx, CO, particulate) Oil (K143 and K144) Ammonia still lime sludge (K060) Decanter tank tar sludge (K087) Tar residues (K141, K142)

Benzene releases in byproduct recovery operations Naphthalene residues generated in the final cooling tower Sulfur and sulfur compounds recovered from coke oven gas Wastewater from cleaning and cooling (contains zinc, ammonia still lime, decanter tank tar, or tar distillation residues) Air pollution control (APC) dust

Source: From U.S. EPA, Profile of the Iron and Steel Industry, EPA 310-R-95-005, U.S. EPA, Washington, DC, 1995.

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