机械-化学耦合活化对铜尾矿火山灰活性的影响  

Effect of Mechanical-Chemical Coupling Activation on Pozzolanic Activity of Copper Tailings

作　　者：肖莉娜[1] XIAO Lina(School of Science,Jiangxi University of Technology,Nanchang 330098,China)

机构地区：[1]江西科技学院理学部,南昌330098

出　　处：《硅酸盐通报》2020年第11期3595-3600,共6页Bulletin of the Chinese Ceramic Society

基　　金：江西省教育厅项目(GJJ80968,JC19218);江西科技学院校级自然课题(ZR1804)。

摘　　要：为了提高铜尾矿的水化活性,采用机械与化学活化方式激发铜尾矿的火山灰活性。结果表明:随着粉磨时间延长,铜尾矿粒度分布变窄,颗粒粒径变小,比表面积逐渐增大。粉磨后的铜尾矿对复合胶凝体系硬化浆体试样发挥了物理填充和活性填充作用,延长粉磨时间有利于提高试样的力学性能。当CaO掺量在3%(质量分数)以内、Na2SiO3掺量在2%(质量分数)以内时,对试样抗压强度具有一定促进作用。铜尾矿复合胶凝体系的XRD谱中检测出石英和水化硅铝酸钙等产物,石英晶相为铜尾矿直接带入,水化硅铝酸钙为铜尾矿活性物质水化产物之一。The pozzolanic activity of copper tailings was activated by mechanical and chemical methods in order to improve the hydration activity of copper tailings.The results show that with the extension of grinding time,the particle size distribution of copper tailings becomes narrower,the particle size becomes smaller,and the specific surface area increases gradually.The milled copper tailings improve the hardened paste samples of the composite cementitious system by physical and chemical filling effects.Prolonging the grinding time is beneficial to increasing the compressive strength of the samples.The compressive strength of the samples is promoted by chemical activators,when the content of CaO is less than 3%(mass fraction)and the content of Na2SiO3 is less than 2%(mass fraction).The products of quartz and calcium aluminum silicate hydrate are detected in XRD patterns of the composite cementitious materials based on copper tailings.Quartz is directly introduced by copper tailings,and calcium aluminum silicate hydrate is one of hydration products generated by the active substances of copper tailings.

关 键 词：活化 铜尾矿 火山灰活性 抗压强度 水化产物 

分 类 号：TU528[建筑科学—建筑技术科学]