| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a precast block capable of being compounded with 30 mass % or above of coarse aggregate with a particle size of 5 mm or above obtained by crushing used refractory and excellent in melt loss resistance and fire resistance, and its manufacturing method. <P>SOLUTION: Monolithic slip-cast refractories 2 containing 30 mass% or more of the coarse aggregate with a particle size of 5 mm or larger obtained by crushing refractories are kneaded in a kneader 3 and the kneaded slip-cast monolithic refractories 2 are allowed to directly fall in a form 4 from the kneader 3 and solidified to manufacture the precast block. In this manufacturing method, a partition plate 8 is preliminarily provided in the form 4 and, after the form is filled with the monolithic refractories 2, the partition plate 8 is removed. The coarse aggregate is obtained by crushing the used refractories and the refractories of equal material quality corresponding to the use of the precast block are selected and used for the coarse aggregate. <P>COPYRIGHT: (C)2005,JPO&NCIPI |
