煤矸石与铁尾矿制备加气混凝土的试验研究  

Experimental study on autoclaved aerated concrete from coal gangue and iron ore tailings

作　　者：王长龙[1,2,3] 乔春雨[1,2] 王爽[1,2] 倪文[1,2] 吴辉[1,2] 仇夏杰 

机构地区：[1]北京科技大学土木与环境工程学院,北京100083 [2]北京科技大学金属矿山高效开采与安全教育部重点实验室,北京100083 [3]河北工程大学土木工程学院,河北邯郸056038

出　　处：《煤炭学报》2014年第4期764-770,46,共7页Journal of China Coal Society

基　　金：国家高技术研究发展计划(863)资助项目(2012AA062405);河北省建设科学技术研究计划资助项目(2012-136)

摘　　要：为综合利用固体废弃物煤矿石与铁尾矿,以煤矸石和铁尾矿为主要原料制备加气混凝土,用X射线衍射(XRD)、场发射扫描电镜(FE-SEM)和X-射线能谱(EDX)分析制品的水化产物和微观形貌,研究了煤矸石的最佳热活化温度以及各原料组分对加气混凝土物理力学性能的影响。结果表明,煤矸石最佳煅烧温度为600℃,制备出绝干密度为608 kg/m3、抗压强度为3.64 MPa的制品,符号《蒸压加气混凝土砌块》(GB 11968—2006)规定的A3.5,B06级加气混凝土合格品的要求;蒸压前水化产物中出现钙矾石,蒸压后制品中主要的水化产物为托贝莫来石、C-S-H凝胶和葡萄状水钙铝榴石。For comprehensive utilization of coal gangue and iron ore tailings, XRD, FE-SEM and EDX were used to an- alyze hydration products and microstructure of autoclaved aerated concrete （AAC） mainly from coal gangue and iron ore tailings. Furthermore,it was studied that the influence of raw materials and the optimal thermal activation tempera- ture of coal gangue to physical and mechanical prosperities. The results show that 600 ℃ is the optimal calcination temperature AAC with bulk density of 608 kg/m3 and strength of 3.64 MPa, which can reach the requirements of A3.5, B06 level of AAC product regulated by ＂autoclaved aerated concrete block＂ GB 11968--2006. There exists ettringite before autoclaved and the main hydration products are tobermorite, C-S-H gel and hibsehite, which is globu- lar and botrvoidalis.

关 键 词：煤矸石 铁尾矿 加气混凝土 托贝莫来石 水钙铝榴石 

分 类 号：TD926[矿业工程—选矿]