Process for manufacturing a slag conditioning agent for steel desulfurization
AssigneeS.A. Lhoist Recherche et Developpement
InventorsEric Perrin, Souliyann Chunlamani
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Abstract
A slag conditioning agent for steel desulfurization is shown which is made by a process in which a dried slag material obtained from a secondary steelmaking process is mixed with quicklime particles. The quicklime particles react with moisture in the slag material to dry the slag material and produce a blend of slag material, hydrated lime and any unreacted quicklime. The blend is then sieved to separate out the hydrated lime. The retained dried fraction after sieving is then mixed with an Al2O3 mass fraction from which the slag conditioning agent can be collected. The slag conditioning agent has an equivalent mass ratio which is between 0.55 and 1.5.
Claims4
A slag conditioning agent for a process of steel desulfurization, comprising phases of calcium aluminate and an equivalent mass ratio CaO/Al2O3 comprised between 0.55 and 1.5, said slag conditioning agent having an iron content measured by XRF and expressed in equivalent Fe2O3 of at least 3 wt %, an aluminum content expressed in equivalent Al2O3 of at least 30 wt %, and an amount of calcium ferrites measured by XRD of at least 1 wt % relative to the weight of the slag conditioning agent.
Dependencies are inferred from the claim text.