碱性环境中铁尾矿的化学稳定性研究  

Chemical Stability Study on Iron Ore Tailing under Alkaline Environment

作　　者：李晓光[1] 景帅帅[1] 马昕[1] 

机构地区：[1]长安大学建筑工程学院,西安710061

出　　处：《混凝土与水泥制品》2014年第3期79-82,共4页China Concrete and Cement Products

基　　金：陕西省自然科学基金项目(SJ08E207);陕西省科技统筹创新工程计划项目(2012KTCG01-05)

摘　　要：将铁尾矿和河砂分别浸泡于三种碱性溶液中,分别测定了不同浸泡时间的质量损失率、浸泡溶液的pH值和电导率值变化。结果表明:铁尾矿不会发生碱-集料反应;碱性环境中,河砂的质量损失率总体高于铁尾矿。河砂浸泡液的pH值降幅高于铁尾矿;河砂浸泡液的电导率值高于铁尾矿。在碱性环境中,铁尾矿比河砂具有更好的化学稳定性,具有代替河砂配制水泥基胶凝材料的可行性。The iron ore tailing （IOT） and river sand are respectively soaked into three kinds of alkaline solution with different pH to test the mass loss of granules, pH and electricity conductivity of soaking solution in different periods. The results show that IOT is not susceptible to alkali-silica reaction. Mass loss of river sand is higher than that of IOT under the alkaline solution. The pH of soaking solution with river sand has more significant decrease compared with that of IOT, whereas inversely variation for electricity conductivity occur following prolongation of time. Better chemical stability of IOT is proven than that of river sand, which provides a reliable guarantee for application of IOT in Portland cement materials substituting river sand as fine aggregate.

关 键 词：铁尾矿 碱-集料反应 碱性溶液 稳定性 

分 类 号：TU528.01[建筑科学—建筑技术科学]