| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide raw materials for the civil engineering and the construction and a method of producing them which can be converted into materials for the civil engineering and the construction only by adding water while utilizing burnt ash, sludge or stone powder. SOLUTION: This method comprises the steps of treating muddy water containing stone powder in a sedimentation tank 1 to sediment and separate the sludge, feeding the sludge to a concentration tank 5, feeding the concentrated sludge to a filter-press type dehydrator 8, dehydrating the sludge to a water 30 wt.%, content of at most feeding the dehydrated cake to a rotating granulator 25, mixing cement to the rotating granulator at a ratio of 20 wt.% of cement based on 80 wt.% of sludge cake, and granulating the mixture into pellets having about 20 mm particle size suitable for the raw material for the civil engineering and the construction containing unhydrated cement inside or/and the surface of the particles.</p> |
