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首页> 美国卫生研究院文献>Materials >Preparation of Cemented Oil Shale Residue–Steel Slag–Ground Granulated Blast Furnace Slag Backfill and Its Environmental Impact
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Preparation of Cemented Oil Shale Residue–Steel Slag–Ground Granulated Blast Furnace Slag Backfill and Its Environmental Impact

机译：胶结油渣残渣钢渣颗粒颗粒高炉炉渣回填及其环境影响的制备

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A new environmentally friendly cemented oil shale residue–steel slag–ground granulated blast furnace slag backfill (COSGB) was prepared using oil shale residue (OSR), steel slag (SS) and ground granulated blast furnace slag (GGBS) as constituent materials. Based on univariate analysis and the Box–Behnken design (BBD) response surface method, the three responses of the 28 days unconfined compressive strength (UCS), slump and cost were used to optimize the mix ratio. Using a combination of scanning electron microscopy-energy dispersive spectroscopy (SEM-EDS), Fourier transform infrared (FTIR) spectroscopy, X-ray diffraction (XRD) and mercury intrusion porosimetry (MIP), the reaction products, microscopic morphology and pore structure of the specimens with the optimal mix ratio at different curing ages were analyzed. The influence of heavy metal ions from the raw materials and the COSGB mixtures on the groundwater environment was studied by leaching tests. The research demonstrates that the optimal mix ratio is GGBS mixing amount 4.85%, mass ratio of SS to OSR 0.82, and solid mass concentration 67.69%. At shorter curing age, the hydration products are mainly calcium alumino silicate hydrate (C-A-S-H) and calcium silicate hydrate (C-S-H) gels. With the increase of curing age, ettringite (AFt) and C-S-H gels become the main source of the UCS. Meanwhile, the porosity of the filler decreases continuously. The leaching concentration of heavy metal ions from the COSGB mixtures is all lower than the leaching concentration of raw materials and meet the requirements of the Chinese groundwater quality standard (GB/T 14848-2017). Therefore, this new COSGB cannot pollute the groundwater environment and meets backfill requirements. The proposed technology is a reliable and environmentally friendly alternative for recycling OSR and SS while simultaneously supporting cemented paste backfill (CPB).
机译：一种新型环保胶合油页岩残渣钢渣-磨碎的粒状高炉矿渣回填（COSGB）使用油页岩残渣（OSR），钢渣（SS）和磨碎的粒状高炉矿渣（矿渣微粉）作为构成材料制备。根据单变量分析和盒Behnken法设计（BBD）响应面分析法，对28天三个响应无侧限抗压强度（UCS），坍落度和成本被用来优化混合比率。使用扫描电子显微镜 - 能量色散光谱法（SEM-EDS）的组合，傅立叶变换红外（FTIR）光谱法，X射线衍射（XRD）和汞压入法（MIP），所述反应产物，微观形态和孔隙结构的在不同年龄的固化的最佳混合比的样品进行分析。重金属离子从原料和对地下水环境COSGB混合物的影响，通过沥滤试验，研究。该研究表明，最佳混合比率混合矿粉量4.85％，SS的质量比为0.82 OSR，和固体的质量浓度67.69％。在更短的固化年龄，水合产品主要钙铝硅酸盐水合物（C-A-S-H）和硅酸钙水合物（C-S-H）凝胶。与固化年龄，钙矾石（AFT）和C-S-H凝胶的增加成为UCS的主要来源。同时，填料的孔隙率不断降低。从COSGB混合物重金属离子的浸出浓度均高于原料的浸出浓度低和满足的中国地下水质量标准（GB / T 14848-2017）的要求。因此，这种新的COSGB不能污染地下水环境，满足回填要求。所提出的技术是回收OSR和SS，同时支持胶结粘贴回填（CPB）的可靠和环保的替代。

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