コークス炉耐火物の侵蝕に関する研究

概要

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Changes of refractories, both silica and grog brick, after a long period of service in a by-product coke oven were studied. Sample bricks were taken from different parts of the oven. As they showed layered structure, chemical analysis, microscopic examination, estimation of mineral composition, determination of density, porosity and of water absorption were made on each layer. The results are summarized as under.(1) Silica brick from the centre of coking chamber wall: In the first (hotest) layer, all of quartz has been converted into tridymite of lath-shape habit, whereas cristobalite content increases gradually towards the coke side (lower temperature layers). The impurities, such as iron oxide and lime, seem to have migrated from both of coke and flue side towards the mid-layer, where they reach maximum amount.(2) Silica brick from oven door (jamb brick): Chief mineral composition is very much like to that of the brick from the wall, except that the impurities are concentrated on the flue side. Those impurities have come from flue side, whereas hitherto only those from coal ash were noticed.(3) Grog bricks from the roof and sole of the coking chamber: The impurities are concentrated on those surfaces which are facing to coking chamber. There are many large cracks on the surface.(4) Sulphur and carbon contents are slight in silica bricks. Sulphur seems to occur in forming ultramarine.
社団法人日本セラミックス協会の論文
1956-05-01