PROCEDIMENTO PER AUMENTARE LA DURATA DEL RIVESTIMENTO DI FORNI AD ARCO

摘要

The lining contains MgO and solid constituents in the furnace charge fuse into the lining. Refining is carried out under a slag contg. lime and magnesia; and dolomite lime is included in the charge. The dolomite lime is pref. used at the rate of 25-30 kg/t steel; and the dolomite pref. forms 5-15% of the slag. The dolomite lime pref. contains 35-40% MgO, the remainder being CaO plus impurities; and it is pref. sprayed onto the slag as powder via a mobile lance. Lumps of lime are pref. added after the addn. of the dolomite lime, esp. after removing at least part of the slag. The furnace is pref. used for melting and refining scrap and/or iron sponge. Erosion of the lining along the slag line and above is reduced so less patching is required. The dolomite lime replaces part of the lime used to remove P and S.