Inputs and Outputs for Steel Sheet

Inputs

Semifinished steel shapes (slabs, billets, blooms) Process cooling, rinsing, and cleaning water

Cleaned steel products (e.g., sheets, plates, bars, pipe) Process wastewater containing mill scale, oils, other pollutants, and low levels of metals Wastewater sludge Air pollution control (APC) dust Spent pickle liquor (K062) Spent pickle liquor rinse water sludge

Outputs

Pickling acids Molten salts Alkaline cleaners Fuel

Electricity Oxygen Nitrogen Hydrogen

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

gives the major inputs and outputs for steel sheet, a typical steel product. The key environmental and energy facts of forming and finishing are presented in Table 2.15.

2.7.2 Sources of Process Waste

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