摘要
使用赤泥、矿渣、脱硫石膏和质量分数10%的水泥熟料制备了一种充填采矿用胶结剂,研究了将胶结剂应用到不同类型矿山的适应性,并通过扫描电镜和核磁共振分析了净浆试块水化早期微观结构以及硅酸盐和铝酸盐结构变化.结果表明胶结剂制备的充填料适用于铁矿及普遍采用充填法开采的铅锌矿、铜矿和金矿,且比水泥充填料在强度和保水性方面上具有更明显的优势.胶结剂2.5 h终凝,在2.5 h内钙矾石开始形成,对凝结硬化起了重要作用.4 h后大量四配位铝向六配位铝转化,硅酸盐聚合度增加,钙矾石、C-S-H凝胶和沸石等不断形成.这些水化产物尺寸和形态各异,且交织在一起,试块结构开始变得致密,这是胶结剂4 h后强度形成并快速发展的原因.
A new cementing agent, RSGC, designed for filling was prepared with red mud, blast furnace slag, flue gas desul- phurization gypsum and a little cement clinker. The adaptability of RSGC used in different mines was studied and the early hydration including microstructure and structural changes of silicates and aluminates were investigated by scanning electron microscopy and nu- clear magnetic resonance techniques. It is found that RSGC applies not only to iron ore mines but also to copper mines, gold mines and lead-zinc mines which generally adopt the filling mining method. Filling materials used RSGC exhibit significant strength and water re- tention advantages over traditional cement filling materials. The RSGC paste hardens at 2. 5 h. Ettringite generated before 2. 5 h makes important contributions to the setting and hardening. After 4 h, parts of the tetrahedrally-coordinated aluminium turn into an octahe- drally-coordinated state, and polymerization of silicates increases. This phenomenon means that ettringite, C-S-H gels and zeolites generate continuously. The combination of these hydration products in various sizes and shapes forms a compact arrangement and a dense structure, which is probably the reason why the RSGC paste obtains strength from 4 h and the strength increases dramatically from that time.
出处
《工程科学学报》
EI
CAS
CSCD
北大核心
2015年第4期414-421,共8页
Chinese Journal of Engineering
基金
国家自然科学基金面上项目(51074018)
关键词
胶结剂
水化
强度
结构变化
核磁共振
cementing agents
hydration
strength
structural changes
nuclear magnetic resonance
