| 摘要 |
<P>PROBLEM TO BE SOLVED: To reduce the generation of caves while securing the depth of a tap hole and a tapping time and as a result, to attain the improvement of blast furnace operation rate, the reduction of use quantity of a mud material and the lightening of work load. <P>SOLUTION: In the blocking material for the tap hole in the blast furnace which is formed by kneading powder comprising refractory aggregate and refractory fine powder with tar and/or phenol resin, the content of CaO after a volatile component is removed is controlled to be 0.2-10 mass%. As a CaO source, a combined material, which contains a CaO component and is selected from a group of alumina cement, portland cement, blast furnace slag, converter slag, calcia clinker, calcium carbonate, and slaked lime, is used singularly or by combining two or more. <P>COPYRIGHT: (C)2010,JPO&INPIT |
