摘要
将高岭石型硫铁矿烧渣经磁化焙烧-磁选,得到w(TFe)为57.5%的铁精矿和偏高岭石为主的尾矿。利用微量热仪、差热分析(DTA)、扫描电镜(SEM)等手段研究了掺加磨细后尾矿对普通硅酸盐水泥水化硬化的影响。结果表明:主要含偏高岭石的尾矿能够明显降低水泥的水化热,吸收氢氧化钙,在水化后期改善水泥浆体的微观结构,使得水泥石更加均一密实。同时,磨细尾矿的掺入使水泥净浆的标准稠度需水量增加,凝结时间延长。当取代水泥用量达15%时,尾矿能够提高水泥胶砂的28天抗压强度。
Kaolinite-pyrite cinder was separated iron ore concentrate with Fe grade of 57.5% and tailings mainly containing metakoalin using magnetic separation after magnetizing roasting.Effect of kaolinite-pyrite cinder on hydration and hardening of portland cement were characterized by calorimetry,differential thermal analysis and scanning electron microscopy.The results show that the tailings can significantly reduce the heat of hydration of cement and react with Ca（OH）2,improving the microscopic structure of the cement paste for microstructure more homogeneous dense in the late of hydration cement paste.The water requirement of normal consistency and setting time increased when containing tailings in the cement paste.When the tailings take 15% in cement,strength values of cement mortar is higher than the comparative sample and can endure 28 more days of hydration.
出处
《矿物学报》
CAS
CSCD
北大核心
2013年第2期153-157,共5页
Acta Mineralogica Sinica
基金
四川省非金属复合与功能材料重点实验室开放课题(10zxfk09)
西南科技大学大学生创新创业训练计划创新训练项目(201251079016)
