Abstract
IMEXSA steel has a four electric arc furnaces (EAF) steelmaking shop which was originally designed to melt a DRI/scrap ratio of 80/20 for producing steel slabs, but logistical and economical circumstances led to a change in this ratio to 98.2/1.8. This decision brought about increases on specific consumptions of energy, electrodes, refractories and a loss of metallic yield among other items. In order to improve melting performance a study involving industrial measurements and thermodynamic-kinetic aspects of slag foaming was carried out. Implementation of a slag foaming practice gave very encouraging results in the main process variables; energy consumption decreased from 730 to 640 kWh/t of steel while electrode consumption decreased from 2.25 kg/t of steel to 1.81 kg/t of steel. With regard to iron oxidation, iron oxide contents in slag decreased from previous 36–40 wt% values to 23–25 wt% increasing substantially metallic yield. Overall process performance was improved and consequences of this program can be directly seen during secondary refining process of steel in LF.
Original language | English |
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Pages (from-to) | 1054-1062 |
Number of pages | 9 |
Journal | ISIJ International |
Volume | 35 |
Issue number | 9 |
DOIs | |
State | Published - 1995 |
Externally published | Yes |
Keywords
- DRI
- EAF
- electrical energy
- foaming
- slag
- steelmaking
- thermal efficiency