Composition of Ladle Slag and Refractory Materials and Its Effect on the Wear Resistance of the Lining of an RH Vacuum Degasser

Abstract

The resistance of magnesian spinellide refractories to molten slag attack is studied and effects associated with the material composition and the microstructure of test specimens are discussed. The mechanisms of corrosion wear and chemical reactions involved are considered in detail. Slags with a basicity of 1.9 -2.1 react with periclase to yield spinel, calcium orthosilicate, and monticellite. To prevent the chemical corrosion of periclase, sintered periclase or alumina as additions to the slag are recommended for use.

Characterization of Ladle Furnace Slag from Carbon Steel Production as a Potential Adsorbent

“…The results of the XRD analysis in the investigated LF slag are comparable with the results published before [2,3,12,14]. Calcium silicates under their various allotropic forms are the major compounds in the LF slag.…”

“…The main compounds are calcium, silicon, magnesium, and aluminium oxides representing more than 92% of the total mass. The available literature data [3,[12][13][14] show typical chemical composition of the ladle slag: CaO ranges from 30% to 60%, SiO 2 ranges from 2% to 35%, Al 2 O 3 ranges from 4.1% to 35.76%, MgO ranges from 1% to 12.6%, FeO ranges from 0% to 15%, MnO ranges from 0% to 5%, Cr 2 O 3 ranges from 0.03% to 0.37%, P 2 O 5 ranges from 0% to 0.4%, TiO 2 ranges from 0.2% to 0.9%, K 2 O ranges from 0.01% to 0.02%, and Na 2 O ranges from 0.06% to 0.07%. Thus, the obtained results are consistent with these data.…”

Simulação termodinâmica e sua aplicação na avaliação do desempenho de materiais refratários

“…Refratários de magnésia-cromo, empregados em fornos destinados ao tratamento e degasifi cação de aços, são os materiais que [11][12][13]. A aplicação combinada de cálculos termodinâmicos de equilíbrio e o modelamento computacional do comportamento de fl uxo do líquido têm permitido obter melhores previsões sobre o desgaste dos materiais refratários contendo óxido de cromo [13].…”

Morphology Evolution and Phase Interactions of Fe-containing Si₃N₄ in Vacuum High-temperature Environment

“…18,19) So far, there have been some attempts of using chrome free MgO-spinel materials in the lower vessel of RH refining furnaces. 20) (Received on August 20, 2015; accepted on October 29, 2015; J-STAGE Advance published date: December 25, 2015) To study the substitution of Fe 3 Si-Si 3 N 4 for refractories in the upper RH refiner, this paper simulated the service condition of RH refining and studied the change of the Fe 3 Si-Si 3 N 4 in the simulated condition. A Fe 3 Si-Si 3 N 4 specimen prepared by flash combustion was put in a vacuum sintering furnace with carbon lining, fired at 1 450°C under 80 Pa of vacuum degree for 2 h, and then cooled.…”

“…still lags, the application of MgO-spinel in refining some steels is pretty satisfied, approaching to that of the fused grain re-bonded magnesia-chromite bricks. 19,20) Compared with the lower vessel, the upper vessel is less vulnerable: it does not contact the melting steel and only suffers slag splashing and chemical corrosion, yet, good thermal shock resistance is required. 16) Silicon nitride (Si 3 N 4 ) material, as a non-oxide material, has good thermal shock stability, and the components of CaO, SiO 2 and Al 2 O 3 in splashing slag hardly wet or affect it, which is suitable for the RH upper vessel.…”