MANUFACTURE OF LIGHTWEIGHT AGGREGATES USING ASH GENERATED BY INCINERATOR FROM URBAN AND INDUSTRIAL WASTE

摘要

PURPOSE: A manufacturing method of lightweight aggregates is provided to save manufacturing costs and greatly decrease sintering temperature and time, compared to conventional method, by using waste incinerated ash and clay as main materials. CONSTITUTION: The lightweight aggregates are manufactured by the following steps of: mixing 100pts.wt. of ash generated by incinerator from urban and industrial waste, 50-200pts.wt. of clay ground to a size less than 16mesh(600micrometer), 5-20pts.wt. of organic sludge such as sewage, waste water and paper sludge, 4-20pts.wt. of strength improver such as blast furnace slag and/or waste gypsum, wherein the incinerated ash contains 50-90wt.% of bottom ash and 10-50wt.% of fly ash, and the addition of organic sludge decrease sintering time and temperature and increase densification by heat generation of organic materials resulting in instant melting and foaming; forming mixed materials into an aggregate shape with a 5-13mm diameter; coating the surface of aggregates with waste gypsum to prevent aggregates from adhering in sintering, and drying until aggregates contain 10% of moisture; putting dried aggregates into a furnace(700-900deg.C), sintering at 1050-1250deg.C for 10-25min and cooling.