Increasing the resistance of oxygen converter linings

Conclusions We developed a. differentiated construction for converter linings using tarred dolomite and periclase — spinel refractories in sites most prone to erosion: the throat, the neck, and the upper cylindrical parts on the pivot sides. Taking into account the topography of the wear we selected a rational profile for the working layer of the lining with which we obtained a higher and more uniform resistance.We developed and introduced a production technology for tarred dolomite refractories by pressingbodies cooled to 35–45°C, using tar with an increased coke residue and a viscosity of C¹⁰ ₄₀=40-50 sec as the bond.We also improved the order of feeding in the batch materials, introduced slag and blow cycles for converter melting, ensuring rapid finishing of the high-basic slag in the blow process, reducing the melting time and the number of heats produced with the blow, etc.As a result of improving the quality of the tarred dolomite refractories, the introduction of the differentiated (with respect to thickness and types of refractories used) constructions for the linings, the use of rational firing cycles for the linings, improvements and stabilization in the quality of the batch materials, and improvements in the converter melting technology, the average life of the converter linings increased to 612 heats and the total consumption of refractories dropped to 2.95 kg/ton of steel; the maximum resistance reached 646 heats.The increase in the life of the linings ensured regular operation of the converter shop and provided a substantial increase in steel output.Translated from Ogneupory, No. 1, pp. 5–11, January, 1970.