AISTech 2022

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Development of Highly Efficient Fluidized Lime for Hot Metal Desulfurization Based on Thermodynamic Calculations and Industrial Validation (Room 318)

Desulfurization is a critical step before converting hot metal to steel. Increasing sulfur inputs while decreasing sulfur targets is difficult and more challenging with approaches like introducing carbon-neutral biomass into blast furnaces. Lhoist investigated improving hot metal desulfurization with innovative blends (Flucal®). Based on carryover slag analyses and enhanced fluidized lime, a theoretical final slag was calculated with Thermo-Calc regarding sulfur capacity and viscosity. Special focus was set on intensified agitation and reduction of fluorine content. Three new receipts where identified and industrially verified. The sulfur removal efficiency was improved 11.7%, treatment time was decreased 10% and splashing was minimized.