山西灵丘低硅铁尾矿制备加气混凝土的试验研究  

Experimental study of using Shanxi Lingqiu low-silica iron ore tailings to produce aerated concrete

作　　者：王长龙[1,2] 倪文[1] 李德忠[1] 耿碧瑶[1] 吴辉[1] 

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

出　　处：《煤炭学报》2012年第7期1129-1133,共5页Journal of China Coal Society

基　　金："十一五"国家科技支撑计划资助项目(2006BAC21B03)

摘　　要：以低硅铁尾矿作为主要原料,铝粉作为发气剂,成功制备出了符合GB/T 11968—2006的A3.5,B06级加气混凝土制品。考虑最大限度使用铁尾矿的情况下,铁尾矿、硅砂、石灰、水泥和脱硫石膏的最优化配合比(质量比)为40∶20∶25∶10∶5,铝粉加入量为0.057%,水料比为0.57,静停养护温度为70℃,加气混凝土制品的抗压强度达到4.11 MPa,此时体积密度为590 kg/m3,比强度为6.97 MPa。由X射线衍射测试分析可知,成品中主要的矿物成分为托贝莫来石,此外还有硬石膏和残留的石英等。扫描电镜和能谱分析结果显示,成品中形成了CSH和托贝莫来石相互交织的网状结构,有效的提高了加气混凝土的强度。The samples of aerated concrete were successfully prepared in line with GB/T 11968-2006 of the A3.5, B06-class by low-silica iron ore tailings as the main raw material, aluminum powder as gas evolution agent. Iron ore tailings,silica sand,lime,cement and gypsum with the optimized ratio（mass ratio） was 40 ： 20 ： 25 ： l0 ： 5 in the case of maximizing the use of iron ore tailings, aluminum powder was added at 0. 057 % , water/solide ratio was 0. 57, the static stop curing at 70℃, the compressive strength and the calculated specific strength of the finished aerated concrete samples with the bulk density of 590 kg/m3 were 4. 11 and 6.97 MPa. The major mineral phases in the aera- ted concrete product were tobermorite with residue quartz and anhydrite. SEM and EDS results show that the finished product to form a network structure by CSH and tobermorite , the compressive strength of aerated concrete samples areeffectively improved.

关 键 词：铁尾矿 加气混凝土 抗压强度 托贝莫来石 

分 类 号：TU528.01[建筑科学—建筑技术科学]