Low cost dressing system for separation of low zinc fractions from BOF filter dust

Conference · Sun Dec 31 04:00:00 EST 1995

OSTI ID:197299

Erdmann, R ^[1]

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1. Krupp Hoesch Stahl AG, Dortmund (Germany)

Today the BOF filter dusts and sludges are mainly dumped due to their zinc contents. By typically ranging from 2 to 5% they prevent the filter dusts and sludges from being recycled via the blast furnace route. Based on the different discharge kinetics of iron and zinc during the main blowing period in a bottom stirred BOF a simple and efficient system for recovery of low zinc fractions has been developed. The obtained material is suitable for recycling without risk of shell formation in the blast furnace. Different subsequent development steps have been performed. By starting with a very simple time dependent model the sludge from the BOF off gas cleaning system was collected in two different sludge channel systems. This model based on the fact that most of the scrap based zinc is discharged from the melt within the first eight to ten minutes of the BOF process. To improve the system a spectroscopic zinc sensor was installed at the hot section of the off gas cleaning system to get more reliable information on the actual zinc concentration of the BOF dust. By use of the system up to 50% of the BOF sludge can be recycled.

• OSTI ID: 197299
• Report Number(s): CONF-951105--; ISBN 0-87339-318-X
• Country of Publication: United States
• Language: English

Related Subjects

32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
BLAST FURNACES
DATA
DESIGN
INDUSTRIAL WASTES
MATERIALS HANDLING EQUIPMENT
MATERIALS RECOVERY
RECYCLING
SEPARATION PROCESSES
SLUDGES
ZINC