転炉スラグに接したタール/ピッチで結合強化したドロマイト耐火物の荷重下耐久性

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Different tar/pitch bonded Egyptian dolomite and dolomite-magnesite mixtures with magnesia content ranging between 30-50% to replace dolomite, were prepared. Three different types of tars with different pitch content (I, II and III) were used. The mixtures were moulded, tempered and attacked by BOF slag at temperatures up to 1700℃. The attacking process was carried out under load 3.5-5 kg/cm^2 as a new method to study the deformation of the refractory to indicate the slag attack. The results showed that tar/pitch (III) with 80% pitch can resist load up to 4 kg/cm^2 when attacked by BOF slag. At the same time, increasing the magnesia content of the tar/pitch (111)-bonded dolomite up to 50% magnesia can increase its softening un der load up to 5 kg/cm^2. The effect of the slag composition on the best-obtained mixture of the tar/pitch (III) -bonded dolomite-magnesite refractory was studied. Tempered tar/pitch (111)-bonded Egyptian dolo mite was attacked by synthetic basic slag containing different iron oxide content. It was found that the in crease of the iron oxide content of the slag is the main factor responsible for the attacking of refractories. It was concluded from this study that, this test could be considered as beneficial test because it simulates the application of the refractories in the furnace. It also can be used as fast criteria for the determination of the resistance of the refractories for slag attacking and can provide the manufacturer and the consumer valuable data about the behavior under load.
2002-10-01

転炉スラグに接したタール/ピッチで結合強化したドロマイト耐火物の荷重下耐久性

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