磷石膏基矿山胶结料开发研究

发布时间：2019-02-13 00:11

【摘要】：本文在过硫磷石膏矿渣水泥的研究基础上,重新调整配比,开发出了成本低廉、低碳环保的适用于采矿回填的磷石膏基矿山充填材料和以过硫磷石膏矿渣水泥为胶结剂,以硫铁矿尾砂或铜矿尾砂为骨料的磷石膏-全尾砂充填材料,通过物理化学方法研究分析了充填材料的强度、凝结时间等物理性能及其流动性等工作性能,用激光粒度、XRD和SEM等方法分析探讨了充填材料的微观机理,并将磷石膏-全尾砂充填材料与PC32.5水泥-全尾砂充填材料进行了性能对比,结果表明：磷石膏基矿山充填材料,可以钢渣或硅酸盐水泥熟料为碱性激发剂。以钢渣为激发剂时,体系中磷石膏浆掺量可达67%,其最佳配比(干基)为磷石膏67%、矿渣20%、钢渣13%,聚羧酸母液0.2%,质量浓度66%-69%。以硅酸盐水泥熟料为碱性激发剂时,体系中磷石膏浆掺量可达86%,其最佳配比(干基)为磷石膏86%、矿渣9%、熟料5%,聚羧酸母液0.2%。。该充填材料7天强度超过2.0MPa,满足矿山充填强度要求,28天强度较高,用于矿山充填有很大的强度富余；该充填材料的流动性能较好,可选用自流充填工艺。磷石膏-全尾砂充填材料适用于不同类型的矿山,用于硫铁矿山,以硫铁尾矿砂为骨料时,该充填材料胶结剂的最佳配比(干基)为：磷石膏23%,矿渣48%,熟料4%,钢渣25%。在胶砂比为1：4,质量浓度62%时,该充填料的7天强度可达2.25MPa。用于铜矿山,以铜矿尾砂为骨料时,该充填材料胶结剂最佳配比(干基)为：磷石膏28%,矿渣粉48%,熟料4%,钢渣20%。在质量浓度72%,胶砂比1：4时,该充填料3天强度即可达到2.5MPa。实验结果表明,磷石膏-全尾砂充填材料与PC32.5水泥-全尾砂充填材料相比有更广的胶砂比范围,性能更为优越。通过微观测试方法分析磷石膏-全尾砂充填材料的胶结机理和钢渣掺量对体系结构的影响规律,结果表明：充填料的胶结剂水化产物主要为钙矾石晶体和C-S-H凝胶,而尾矿砂并未参与水化反应,只起骨料充填的作用。胶结剂的水化产物将尾砂胶结在一起,同时填充体系中的空隙,达到胶结的效果。充填料胶结效果与胶结剂水化产生的钙矾石含量密切相关,因此胶结剂中适量的钢渣掺量是影响充填料强度的关键因素。
[Abstract]:Based on the research of persulphogypsum slag cement, a low cost and low carbon environmental protection phosphorous gypsum based mine filling material and persulphogypsum gypsum slag cement as cementing agent have been developed based on the research of persulphos gypsum slag cement, which is low cost and low carbon environmental protection. Using pyrite tailings or copper tailings as aggregates, phosphogypsum-total tailings filling materials were studied and analyzed by physical and chemical methods, such as strength, setting time, physical properties, fluidity and other working properties. The laser particle size was used to study the properties of the filling materials, such as the strength, the setting time, and the fluidity of the filling materials. The microscopic mechanism of the filling material was analyzed by XRD and SEM, and the properties of phosphogypsum-whole tailings filling material and PC32.5 cement-whole tailing filling material were compared. The results showed that the phosphogypsum based filling material was used in mine. Steel slag or Portland cement clinker can be alkaline activator. When steel slag is used as activator, the amount of phosphogypsum slurry in the system can reach 67, the optimum ratio (dry base) is phosphogypsum 67, slag 20, steel slag 13, polycarboxylic acid solution 0.2, mass concentration 66-69. When Portland cement clinker is used as alkaline activator, the amount of phosphogypsum slurry in the system can reach 86. The optimum ratio (dry base) is phosphogypsum 86, slag 9, clinker 5, polycarboxylic acid mother liquor 0.2. The strength of the filling material is more than 2.0 MPa in 7 days, which meets the requirement of mine filling strength, and the intensity in 28 days is high, and the filling material has great strength surplus for mine filling, and the filling material has better fluidity and can be selected as self-flowing filling technology. Phosphogypsum-total tailings filling material is suitable for different types of mines, used in pyrite mountains. When pyrite tailings are used as aggregates, the optimum ratio (dry base) of cementing agent for this filling material is: phosphogypsum 23, slag 48, clinker 4, The steel slag is 25. When the ratio of cement to sand is 1: 4 and the mass concentration is 62, the strength of the filling material can reach 2.25 MPA in 7 days. When copper tailings are used as aggregate, the optimum ratio of cementing agent (dry base) of the filling material is as follows: phosphogypsum 28, slag powder 48, clinker 4, steel slag 20. When the mass concentration is 72 and the ratio of cement to sand is 1:4, the strength of the filling material can reach 2.5 MPA in 3 days. The experimental results show that the phosphogypsum full tailing filling material has a wider cement-sand ratio range and better performance than PC32.5 cement-total tailings filling material. The cementation mechanism of phosphogypsum and total tailings filling material and the influence of steel slag content on the structure of the system were analyzed by microcosmic test method. The results showed that the hydration products of cementing agent were mainly ettringite crystals and C-S-H gels. The tailings did not participate in hydration reaction, but only played the role of aggregate filling. The hydration product of the binder binds the tailings together and fills the voids in the system to achieve the effect of cementing. The cementation effect of filling material is closely related to the content of ettringite produced by hydration of cementing agent, so the appropriate amount of steel slag in cementing agent is the key factor affecting the strength of filling material.
【学位授予单位】：武汉理工大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：X751;TU52

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