【摘要】：本文在過硫磷石膏礦渣水泥的研究基礎(chǔ)上,重新調(diào)整配比,開發(fā)出了成本低廉、低碳環(huán)保的適用于采礦回填的磷石膏基礦山充填材料和以過硫磷石膏礦渣水泥為膠結(jié)劑,以硫鐵礦尾砂或銅礦尾砂為骨料的磷石膏-全尾砂充填材料,通過物理化學(xué)方法研究分析了充填材料的強(qiáng)度、凝結(jié)時(shí)間等物理性能及其流動(dòng)性等工作性能,用激光粒度、XRD和SEM等方法分析探討了充填材料的微觀機(jī)理,并將磷石膏-全尾砂充填材料與PC32.5水泥-全尾砂充填材料進(jìn)行了性能對(duì)比,結(jié)果表明： 磷石膏基礦山充填材料,可以鋼渣或硅酸鹽水泥熟料為堿性激發(fā)劑。以鋼渣為激發(fā)劑時(shí),體系中磷石膏漿摻量可達(dá)67%,其最佳配比(干基)為磷石膏67%、礦渣20%、鋼渣13%,聚羧酸母液0.2%,質(zhì)量濃度66%-69%。以硅酸鹽水泥熟料為堿性激發(fā)劑時(shí),體系中磷石膏漿摻量可達(dá)86%,其最佳配比(干基)為磷石膏86%、礦渣9%、熟料5%,聚羧酸母液0.2%。。該充填材料7天強(qiáng)度超過2.0MPa,滿足礦山充填強(qiáng)度要求,28天強(qiáng)度較高,用于礦山充填有很大的強(qiáng)度富余；該充填材料的流動(dòng)性能較好,可選用自流充填工藝。 磷石膏-全尾砂充填材料適用于不同類型的礦山,用于硫鐵礦山,以硫鐵尾礦砂為骨料時(shí),該充填材料膠結(jié)劑的最佳配比(干基)為：磷石膏23%,礦渣48%,熟料4%,鋼渣25%。在膠砂比為1：4,質(zhì)量濃度62%時(shí),該充填料的7天強(qiáng)度可達(dá)2.25MPa。用于銅礦山,以銅礦尾砂為骨料時(shí),該充填材料膠結(jié)劑最佳配比(干基)為：磷石膏28%,礦渣粉48%,熟料4%,鋼渣20%。在質(zhì)量濃度72%,膠砂比1：4時(shí),該充填料3天強(qiáng)度即可達(dá)到2.5MPa。實(shí)驗(yàn)結(jié)果表明,磷石膏-全尾砂充填材料與PC32.5水泥-全尾砂充填材料相比有更廣的膠砂比范圍,性能更為優(yōu)越。 通過微觀測(cè)試方法分析磷石膏-全尾砂充填材料的膠結(jié)機(jī)理和鋼渣摻量對(duì)體系結(jié)構(gòu)的影響規(guī)律,結(jié)果表明：充填料的膠結(jié)劑水化產(chǎn)物主要為鈣礬石晶體和C-S-H凝膠,而尾礦砂并未參與水化反應(yīng),只起骨料充填的作用。膠結(jié)劑的水化產(chǎn)物將尾砂膠結(jié)在一起,同時(shí)填充體系中的空隙,達(dá)到膠結(jié)的效果。充填料膠結(jié)效果與膠結(jié)劑水化產(chǎn)生的鈣礬石含量密切相關(guān),因此膠結(jié)劑中適量的鋼渣摻量是影響充填料強(qiáng)度的關(guān)鍵因素。
[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.
【學(xué)位授予單位】：武漢理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2013
【分類號(hào)】：X751;TU52

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