Development of Utilization Process of Inorganic Materials Separated from Urban Residues

Abstract

Utilization of burnt residue was studied as a preliminary research on the resource recovery project from urban residues. Tested materials of burnt residues in this study were supplied from incineration plants in large cities. The residues were classified into inorganic materials and burnt ash passing through a 5mm sieve.
At the laboratory test it was found that mixture of 45% inorganic materials, 10% ash and 45% red mud being pelletized in a size of 10mm, was fired at 900°C to form a light-weight aggregate. Extended studies for commercial production were carried out with a extruding pelletizer and a 7m rotary kiln. As a result, the light-weight aggregate of 1.24 in apparent specific gravity and 14.86% in water absorption fraction could be produced. Concrete test results of light-weight aggregate met the JIS A 5002 (Light-weight Concrete for Structure).
Floor and wall tiles were trially manufactured from the inorganic materials mixed with equilibrated amount of Gairome clay. The tiles were formed by a dry pressing method at 250-300kg/cm² and burnt at 1060°C. The quality satisfied the JIS A 5209 (Ceramic Tiles).