PRODUCTION OF ARTIFICIAL LIGHTWEIGHT AGGREGATE

摘要

PROBLEM TO BE SOLVED: To obtain a granulated article having high strength by using a material prepared by adding an expansible shale in equal to or below a specific weight ratio into a mixed raw material prepared by mixing a coal ash with a sewage sludge incineration ash in a specific ratio to the whole as a raw material. SOLUTION: The raw material consisting of the sewage sludge incineration ash S, 10-80 wt.% coal ash C and the expansible shale in a quantity <=30 wt.% of (S+C), which are extracted from a raw material storage equipment 2, is fed to a mixing equipment 5 through a transportation route 9 and mixed with other raw material as it is in the case of containing no coarse particle portion having several mm diameter. On the other hand in the case of containing the coarse particle portion having several mm particle diameter, the finely pulverized portion pulverized and classified respectively in a pulverizing equipment 3 and a classifying equipment 4 is fed to the mixing equipment 5. In such a case, the mixed raw material is granulated by adding water or a water containing a granulating agent such as bentonite in the granulating equipment 6 respectively into one having 5-20 mm particle diameter for a coarse aggregate and one having <=5 mm particle diameter for a fine aggregate. The granulated article is fired in a firing equipment 7, classified in a classifying equipment 8 to recover an artificial aggregate product P having a desirable particle size and an unrecovered fired article O is used for other application such as a lightweight banking.