DESULFURIZATION OF HOT METAL USING SOFT B URNT LIME

Objective, At the BOF steelmaking plant of EKO Stahl GmbH a goal that is being pursued is the improvement of the metallurgical work during h ot metal desulphurisation while using the existing submerged-lance equ ipment, and thus the reduction of the desulphurisation costs. To be ex amined in particular is the influence of the technological variables o n the reaction kinetics when desulphurising with solid lime. Summary, Based on the investigations conducted at the hot metal desulphurisatio n facility it was found that the specific lime consumption rate falls if the fluidised lime/natural gas mixture is injected with a lower flo w density. Use of the RE-50 control unit has improved the fluidisation and hence also the dispersion of the lime in the carrier gas. This ha s made it possible to considerable reduce the now density of the fluid ised lime/natural gas mixture. The improved conditions of the kinetic reaction have led to an average burnt lime saving of 15% to 20% during hot metal desulphurisation. The fluidisability of the desulphurising agent must also be cited as an additional factor influencing desulphur isation in the submerged-lance process.