Recycling Practices Of Crushed MgO-C Bricks
And Dolomite Sinter Fines Used As A Slag
Conditioning Additive In The EAF
Author(s)
T. C. Avelar, A. F. Veiga, E. Gueguen & J. R. Oliveira
Abstract
Reduction of production cost on electric arc furnace (EAF) technology is
strongly dependent on the efficiency of electrical energy introduced into the
metal bath. Beyond EAF technology, the slag foaming process is currently
applied to some other equipment for steel production aiming to save energy,
productivity improvements, enhance the refractory service life and inhibit steel
re-oxidation and can be achieved by improving the thermal efficiency heat
transfer to the scarp by stabilizing of the arc activity through foamy slag practice.
All these effects can be achieved by guaranteeing the optimum amount of MgO
in the slag to achieve the best foaming quality. The recycling options of Crushed
MgO-C spent refractories removed from EAF without complex and costly
beneficiation have been evaluated with emphasis on the application as a slag
conditioner because of their high MgO content. A specially prepared briquettes
content crushed MgO-C spent refractories and Dolomite Sinter obtained from
rotary kilns process were used as a slag conditioning agent on the slag and metal
phase boundary aiming an optimum amount of MgO in the slag and the
formation of gas bubbles needed to achieve the best foaming quality necessary
for the foaming effect. After several tests in the laboratory simulating EAF
conditions a final formulation was defined. Together with a computer model
based on published phase-diagrams which graphically maps the chemistries for
the dual saturated slag, the optimum MgO amount to control the slag
composition while the equipment is being operated was defined. The additional
Keywords
electric arc furnace (EAF), foaming slags, refractory recycling slag conditioning
Related Book
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