PROCESS FOR PREPARING LIGHTWEIGHT AGGREGATE MATERIAL USING FLY-ASH

摘要

A lightweight aggregate is prepared by treating flyash as a major component. The process comprises mixing 75-90 wt. parts flyash, 5-15 wt. parts lime powder and 5-10 wt. parts coal powder; adding and blending 20-25 wt. parts water with the mixture; introducing 15-40 vol.% of bubbles by means of a foaming agent with respect to said mixture into the resulting mixture; blending them again for 10-15 mins; pressing and cutting to prepare a spheroidal body; passing through a rotary drying machine; and firing the dried spheroidal body in a rotary kiln at a temperature of 1,180-1,250 deg.C for 3-5 hours, and then cooling.