低贫钒钛铁尾矿制备加气混凝土  

Preparation of Autoclaved Aerated Concrete with Lean Vanadium and Titanium Magnetite Tailing

作　　者：舒伟[1] 罗立群[1] 程琪林 谭旭升 

机构地区：[1]武汉理工大学资源与环境工程学院矿物资源加工与环境湖北省重点实验室,湖北武汉430070

出　　处：《过程工程学报》2015年第6期1075-1080,共6页The Chinese Journal of Process Engineering

基　　金：国家科技支撑计划资助项目(编号:2013BAB03B03)

摘　　要：以低贫钒钛铁尾矿为主要原料制备蒸养加气混凝土,考察了铁尾矿掺量与粒度、硅砂掺量与粒度及石灰、水泥用量的影响,分析了产品物相和形貌.结果表明,制备加气混凝土的最优条件为铁尾矿:硅砂:石灰:水泥:石膏质量比45:20:19:14:2,铝粉掺量为0.09%,水料质量比为0.60.该条件下成品的抗压强度为3.52 MPa,干体积密度为620.8kg/m3,达到蒸压加气混凝土性能国家标准.蒸养前制品中多为低结晶度、无定型的C?S?H凝胶水化物相和铁尾矿颗粒相及部分钙矾石相,蒸养后成品中形成大量结晶良好的托贝莫来石,并与其他水化产物的晶簇集合体和骨料相互交织,形成致密的结晶网状结构,可提高加气混凝土制品的性能.Autoclaved aerated concrete was prepared with lean vanadium and titanium magnetite tailing as main raw material and characterized, and the influential factors on the preparation were examined. The results showed that the optimal conditions of preparation were obtained as the mass ratio of iron ore tailing to silica sand, lime, cement and gypsum at 45：20：19：14：2, content of Al powder 0.09% and mass ratio of water to materials 0.60. Under the optimal conditions, the compressive strength of final concrete product was 3.52 MPa, and dry bulk density 620.8 kg/m^3, which accorded with the national standards of autoclaved aerated concrete. The product was mostly composed of low crystallinity and amorphous C-S-H gel and hydrates, iron ore tailing particles and ettringite before high pressure steaming treatment. A large amount of tobermorite with good crystallization formed in the autoclaved product, and mixed with the rest of hydration products, leading to the crystallized network of dense mesh structure with the crystal clusters and aggregates of other aquatic products, which promoted the performance of autoclaved aerated concrete.

关 键 词：铁尾矿 加气混凝土 托贝莫来石 性能 

分 类 号：TU528.2[建筑科学—建筑技术科学] TD926[矿业工程—选矿]