Interaction of periclase and corundum refractories with iron and iron-manganese melts

Abstract

With six to seven melts per day and a lining t e m p e r a t u r e of not less than 600~ w e a r takes place by fusion of the working zone, not by cracking, as noted above. In this connection the lining structure is monolithic with a glazed surface. With this intensity of operation the variation of the lining wear is determined by the chemical composition of the stag.With six to seven melts per day (_46% of the campaigns) the ladle lining durability after hot patching was 28 melts, with a maximum of 37 melts, as compared with 17.1 for ladles without hot patching and from one to two melts per day. Thus the use of a r e f r a c t o r y dressing for patching local sectors of wear reduces the number of intermediate maintenance operations.Over a test period of 2 months with 1.58 hot patchings per ladle campaign, the durability was increased on average from 19.1 to 23.3 melts, with a r e f r a c t o r y consumption of 5.4 kg/tou of steel as against 6.3 kg/ton without hot patchings. Figure 3 shows the variation of the lining durability over a period of years. CONCLUSIONSThe use of 70-75% of silica artifacts to line steel-teeming ladles, accompanied by routine hot patchings, has permitted an increase in the lining durability by from four to five melts.With an increase in the ladle throughput from 1-2 to 6-7 melts per day, accompanied by hot patchings, the maximal lining durability was 37 melts (average 28 melts) and the refractory consumption was reduced by 2.1 kg/ton of steel.The saving obtained by the use of a silica lining was 332,200 rubles. INTERACTIONOF PERICLASE AND CORUNDUM REFRACTORIES WITH IRON AND IRON--MANGANESE MELTS