摘要
以城市有机生活垃圾为原料,采用三叶回转窑烧制成陶粒,是一种有效的垃圾资源化处置方式。试验研究了以垃圾、黏土和粉煤灰为原料烧制陶粒的最佳原材料配比和最优焙烧条件,结果表明,1)烧制陶粒的最佳原材料配比(干混合比):垃圾15.38%,黏土14.85%,粉煤灰69.77%;2)最优焙烧条件:窑预热温度500℃,烧成温度1190℃,烧成温度保持时间4min。以最优试验方案制得的陶粒堆积密度为605kg/m3,筒压强度为3.0Mpa,吸水率为11.0%,软化系数为0.93,满足GB/T17431.1—1998规定的普通轻集料700级的技术要求;陶粒浸出毒性实验表明浸出液中各项重金属含量均远低于GB/T5085.3—2007规定的浓度限值,具有环境安全性。
It is an effective technology of recycling organic fractions of municipal solid waste as light-weight aggregates （LWA） fired in trefoil rotary kiln. This paper studies the optimum batch formula and optimal calcination conditions of LWA made from municipal solid waste , clay and coal fly ash.The results indicate that： 1）optimum batch formula （dry mixture ration） is 15.38% of BMW,14.85% of clay,69.77% of coal fly ash; 2）optimal calcination conditions are preheating temperature of kiln：500 ℃, sintering temperature：1190 ℃, holding time of sintering temperature： 4 min. The performance testing indicators of aggregate fired under best experimental parameters shows： bulk density is 605 kg/m3, cylinder compressive strength is 3.0 MPa, 1hr water absorption is 11.0%, apparent density is 0.93, all of the targets meet 700 grade light aggregate of GB/17431.2—1998 standards; the results of leaching test are lower than hazardous constituents concentration limits of GB/T 5085.3—2007 standards, LWA is not hazardous to environment.
出处
《重庆大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2010年第5期139-144,共6页
Journal of Chongqing University
基金
重庆市自然科学基金资助项目(CSTC,2008BB7048)
关键词
城市生活垃圾
陶粒
配比
焙烧条件
municipal solid waste
light-weight aggregates
batch formula
calcination conditions
