SYMPOSIA PAPER Published: 01 January 1984

Management of Solid Wastes in the Iron and Steel Industry


Wastes from a local iron and steel factory are the subject of this study. The manufacturing operations in the plant under consideration are agglomeration of iron ore and sintering, pig iron manufacture, steel making, rolling mill operations, and pickling.

Liquid slag, produced in the blast furnace, is granulated in water and used as a concrete additive. Other wastes are directed separately to sedimentation tanks. The settleable solids are reused, and the treated effluents are pumped to a cooling tower for recycling.

As a result of the new manufacturing expansion, existing waste treatment facilities are not adequate, and it was found necessary to provide additional treatment techniques.

Departmental, as well as composite wastes were treated using plain sedimentation, centrifugal sedimentation, or chemical coagulation, or a combination of these methods.

The results obtained showed that the use of the hydrocyclone for solid-liquid separation is much more efficient than plain sedimentation. When this process was followed by coagulation, very promising results were obtained. The use of pickling liquor as a coagulant gave comparable results with alum and ferric chloride.

Author Information

El-Gohary, F
Water Pollution Control Laboratories, National Research Center, Cairo, Egypt
El-Khouly, MS
Ain Shams University, Cairo, Egypt
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Developed by Committee: D34
Pages: 361–372
DOI: 10.1520/STP32713S
ISBN-EB: 978-0-8031-4916-8
ISBN-13: 978-0-8031-0405-1