Sintering condition of sewage sludge for artificial lightmass aggregate

来源期刊：中南大学学报(英文版)2009年第z1期

论文作者：王里奥 张雷 黄川 董婧蒙

文章页码：270 - 275

Key words：sewage sludge； artificial lightmass aggregate； sintering condition

Abstract: The sintering conditions of artificial lightmass aggregate (LWA) made up of sewage sludge,clay and pulverized flyash (PFA) by trefoil rotary kiln were investigated. The influencing factors of the aggregate strength including furnace temperature when feeding,the heating-up time from 500 to 1 000 ℃ ,the highest burning temperature,retention time at the highest burning temperature and furnace temperature at burning end were analyzed by orthogonal tests. The results show that 44.4% (mass fraction) sewage sludge meets the requirement of aggregate strength,others are 5.5% clay and 50.1% PFA. The burning temperature is the most important factor for the aggregate strength. The optimal sintering condition includes a furnace temperature of 471-490 ℃ when feeding,heating-up time of 10-11min from 500 to 1 000 ℃ ,the highest burning temperature between 1 161 and 1 170 ℃,retention time of 4 min at high burning temperature,and furnace temperature within 1 101-1 150 ℃ at burning end.