利用铁尾矿作为混凝土掺和料的基础研究  

Basic Research on the Preparation of Mineral Admixtures with Iron Ore Tailings

作　　者：崔孝炜[1] 邓惋心 赵雨曦 刘信伟 刘璇[1] 南宁[1] 范新会[1] Cui Xiaowei;Deng Wanxin;Zhao Yuxi;Liu Xinwei;Liu Xuan;Nan Ning;Fan Xinhui(Shaanxi Key Laboratory of Comprehensive Utilization of Tailings Resources,Shangluo University,Shangluo,Shaanxi 726000)

机构地区：[1]商洛学院陕西省尾矿资源综合利用重点实验室,陕西商洛726000

出　　处：《非金属矿》2020年第4期88-91,共4页Non-Metallic Mines

基　　金：陕西省自然科学基础研究计划-陕煤联合基金(2019JLM-49);陕西省科技惠民计划项目(2018ZY-HM-01);商洛市科技计划项目(SK2017-41,SK2018-03-02);商洛学院科技计划项目(18SKY007)。

摘　　要：利用机械力激发矽卡岩型铁尾矿的反应活性,研究机械力作用对铁尾矿粒度分布、火山灰反应活性的影响。以铁尾矿为掺和料制备混凝土,并利用X射线衍射(XRD)和扫描电镜(SEM)对胶凝材料的水化反应机理进行基础研究。结果表明,机械力活化能够提升铁尾矿的火山灰反应活性。当铁尾矿粉磨100 min,掺量为30%时,制备出28 d抗压强度达28.55 MPa的胶砂试样,胶凝材料体系中存在着多固废的协同水化反应,促进体系强度不断增加。The reactivity of skarn type iron tailings was stimulated by mechanical force. The effects of grinding time on particle size distribution and volcanic ash reactivity of iron tailings were studied. The concrete was prepared with iron tailings as admixture, and the hydration reaction mechanism of iron tailings cementitious material was studied by XRD and SEM. The results show that mechanical grinding can stimulate the volcanic ash reactivity of iron tailings. When the iron tailings are ground for 100 min and the content is 30%, The compressive strength of concrete at 28 d can reach to 28.55 MPa. There is a synergistic hydration reaction of multi-solid wastes in the cementing material system, which promotes the continuous increase of system strength.

关 键 词：铁尾矿 火山灰反应活性 水化机理 机械力活化 

分 类 号：TU522.3[建筑科学—建筑技术科学]