| 摘要 |
PURPOSE:To attain stable utilization for a long period with high durability by specifying structure constitution at a part coming into contact with a molten slag. CONSTITUTION:The part coming into contact with the molten slag incorporates 70-90wt.% zirconia and 10-30wt.% flake graphite having 500mum grain size and the zirconia grains are distributed so as to satisfy the followings (a) and (b). Further, this is constituted of a refractory having the structure constitution where the flake graphite exists at >=80% of sieve classification of adjacent zirconia grains exceeding 125mum. a: grain size distribution of the whole zirconia grains (the whole grain size distribution) is constituted of 30-65wt.% grains of >125mum, 20-55wt.% grains of 125-45mum and 15-45wt.% grains of <45mum. b: in grain size between 45-355mum of the standard sieve regulated in the JIS-Z8801 to the whole zirconia grains, zirconia grains exist at least at 3wt.% in each of 355-250mum, 250-180mum, 180-125mum, 125-90mum, 90-63mum and 63-45mum of the adjoined sieve classification. |
