摘要
为提升铁尾矿火山灰活性,实现大宗化综合利用,本试验采用机械力-化学协同活化工艺激发铁尾矿活性,考察活化工艺对活性的影响,然后用活化铁尾矿制备胶凝材料,并研究铁尾矿净浆水化反应产物。结果表明,加入1.0%Na_(2)SiO_(3)再球磨60 min的铁尾矿活化效果最好,火山灰活性指数(PAI)为0.67;以活化铁尾矿代替基准水泥制备胶凝材料,当铁尾矿掺量为30%时,试块28 d抗压强度和抗折强度分别为30.48 MPa和4.93 MPa;活化铁尾矿净浆试块的水化产物为水化硅酸钙(C-S-H)凝胶和钙矾石、羟钙石,以及未反应的石英、菱铁矿等。
In order to improve the pozzolanic activity of iron tailings so as to achieve bulk comprehensive utilization,using mechanical-chemical co-activation process to stimulate the activity of iron tailings to study the influence of activation process on activity,then the activated iron tailings was used to prepare gelling materials,and the hydration reaction products of the net pulp of iron tailings was studied.The results showed that the iron tailings with 1.0%Na_(2)SiO_(3) added and then ball milling for 60 min had the best activation with the PAI of 0.67.When the iron tailings content was 30%,the 28 d compressive strength and fracture strength of the test block can reach 30.48 MPa and 4.93 MPa,respectively.The hydration products of the activated iron tailings net slurry test block were C-S-H gel and ettringite,hydroxyapatite and unreacted quartz,siderite and other mineral phases.
作者
刘璇
聂建仓
苟伊凡
李有仓
李峰
周春生
无
Liu Xuan;Nie Jiancang;Gou Yifan;Li Youcang;Li Feng;Zhou Chunsheng;无(Shaanxi Key Laboratory of Comprehensive Utilization of Tailings Resources,Shangluo University,Shangluo,Shaanxi 726000;Shaanxi Daxigou Mining Co.,Ltd.,Shangluo,Shaanxi 726000;Shaanxi Engineering Research Center for Mineral Resources Clean&Efficient Conversion and New Materials(Shangluo University),Shangluo University,Shangluo,Shaanxi 726000;School of Chemical Engineering and Modern Materials,Shangluo University,Shangluo,Shaanxi 726000)
出处
《非金属矿》
北大核心
2023年第6期70-72,77,共4页
Non-Metallic Mines
基金
陕西省重点研发计划项目(2023-YBGY-503)
陕西省尾矿资源综合利用重点实验室开放基金(2017SKY-WK013)
商洛学院科学研究项目(20FK003)。
关键词
铁尾矿
机械力-化学协同活化
火山灰活性
胶凝材料
iron tailings
mechanical-chemical co-activation
pozzolanic activity index
cementitious material
