全尾砂新型充填胶凝材料开发及其水化机理探讨  

Discussion on exploitation of new backfilling cementing materials with unclassified tailings and associated hydration mechanisms

作　　者：李茂辉[1] 杨志强[1,2] 高谦[1] 王有团[1] 

机构地区：[1]北京科技大学土木与环境工程学院,北京100083 [2]金川集团股份有限公司,甘肃金昌737100

出　　处：《河海大学学报（自然科学版）》2015年第4期335-340,共6页Journal of Hohai University(Natural Sciences)

基　　金：国家高技术研究发展计划(863计划)(SS2012AA062405)

摘　　要：针对司家营铁矿全尾砂,利用石灰、脱硫石膏、矿渣等固体废弃物开展替代水泥的新型充填胶凝材料试验研究,并通过电镜扫描(SEM)和X射线衍射(XRD)分析,研究新型充填胶凝材料激发剂的水化机理,确定激发剂优化配比。研究表明,当料浆质量分数为68%、胶砂比为1∶8、石灰质量分数为3.5%、脱硫石膏质量分数为16.0%时能够满足司家营铁矿南区嗣后充填法采矿对充填体强度的要求。结果显示,新型充填胶凝材料胶砂体与水泥胶砂体相比,结构更致密、产状更粗大,水化产物主要为AFt晶体和无定型C-S-H凝胶,从而大幅度提高了新型充填胶凝材料胶砂体的龄期强度。Based on the exploitation of new bac characteristics of unclassified tailings in the Sijiaying iron mine, experimental research on kfilling cementing materials that can replace the cement was carried out using lime, desulfurization gypsum, slag, and other solid wastes. Using scanning electron microscopy （SEM） and X-ray diffraction （XRD） analysis, the hydration mechanisms of the new backfilling cementing materials were analyzed, and the optimum ratio of activators was determined. The results show that the strength of the new backfilling cementing materials can meet the filling body strength requirements for safe mining in the Sijiaying iron mine when the mass fractions of slurry, lime, and desulfurization gypsum are 68%, 3. 5%, and 16. 0%, show that the new backfilling cementing materials have a respectively, and the cement-sand ratio is 1：8. The results also more compact structure and coarser occurrence when compared with the cement. The hydration products of the new backfilling cementing materials are mainly AFt crystals and C-S-H gel, which greatly increases the age strength of the new backfilling cementing materials

关 键 词：矿山充填采矿法 全尾砂 新型充填胶凝材料 正交试验 微观机理 

分 类 号：TD98[矿业工程—选矿]