Utilization of scrap preheating and substitute slag conditioners for electric-arc-furnace steelmaking. Report of Investigations/1987

Technical Report · Thu Jan 01 04:00:00 EST 1987

OSTI ID:6812253

Elger, G W; Nafziger, R H; Tress, J E; Hartman, A D

The preheating of continuously fed, fragmented ferrous scrap charges by furnace offgases and the utilization of substitutes for imported fluorspar to condition electric steelmaking slags were investigated. Three types of continuous scrap-charging procedures were investigated to determine electrical energy consumption in a 1-st (short ton) electric arc furnace. Cold and preheated scrap charges were continuously fed at rates averaging 37.5 and 43.7 lb. min, respectively. The feed rate varied appreciably from test to test owing to hangup of the scrap in the charge bin. Approximately 7 pct less electrical energy was consumed in melting scrap preheated to 840 to 1,110 F by furnace offgases than in melting cold scrap. Overall energy consumptions were 888 kW per h/st for cold scrap, 829 kW per h/st for preheated scrap, and 637 kW per h/st for conventional backcharged scrap. Stack gases from scrap preheating averaged 120 F and a flow rate of 1,615 standard cubic feet per meter (scfm) compared with 220 F and 1,302 scfm for cold-charged scrap.

• Research Organization: Bureau of Mines, Albany, OR (USA). Albany Research Center
• OSTI ID: 6812253
• Report Number(s): PB-88-230198/XAB; BM-RI-9130
• Country of Publication: United States
• Language: English

Related Subjects

32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
320303* -- Energy Conservation
Consumption
& Utilization-- Industrial & Agricultural Processes-- Equipment & Processes
ALKALINE EARTH METAL COMPOUNDS
ARC FURNACES
CALCIUM COMPOUNDS
CALCIUM FLUORIDES
CALCIUM HALIDES
EFFICIENCY
ELECTRIC FURNACES
ELEMENTS
ENERGY EFFICIENCY
FLUORIDES
FLUORINE COMPOUNDS
FURNACES
HALIDES
HALOGEN COMPOUNDS
HEATING
INDUSTRY
MANAGEMENT
MATERIALS RECOVERY
MELTING
METAL INDUSTRY
METALS
PHASE TRANSFORMATIONS
PROCESSING
RECOVERY
SCRAP
SCRAP METALS
SLAGS
SOLID WASTES
WASTE MANAGEMENT
WASTE PROCESSING
WASTES