Microscopic experiment of consolidating tailings by slag cementing materials
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摘要: 用X射线衍射、扫描电镜和热重!差示扫描量热方法表征了矿渣胶凝材料的水化产物和微观结构,研究了矿渣胶凝材料对尾砂固结过程的影响.微观实验结果表明:矿渣胶凝材料的水化产物主要为水化硅酸钙凝胶(C-S-H)、钙矾石(AFt)及少量的帕水钙石(Ca2Al4Si4O15(OH)2·4H2O)和沸石类矿物,随着养护时间的延长,矿渣胶凝材料在水化过程中发生晶体结构重组和重排;尾砂中的方英石、云母和碳酸盐类矿物(方解石、白云石等)是尾砂固结过程中的活性成分,能生成其他晶体矿物和胶凝状矿物,这是导致固结体微观结构不同的主要原因.Abstract: The hydration products and microstructure of slag cementing materials were characterized and the influence of slag cementing materials on the consolidation of tailings was investigated by using X-ray diffraction analysis, scanning electron microscopy and thermogravimetry-differential scanning calorimetry analysis. Microscopic experimental results indicate that the main hydration products of slag cementing materials are calcium silicate hydrate gel (C-S-H), ettringite (AFt), a small amount of partheite (Ca2Al4Si4O15(OH)2·4H2O) and zeolite minerals. It is found that the crystal structure recombines and rearranges in the hydration process with the increase of curing time. Cristobalite, mica and carbonate minerals (calcite, dolomite, etc.) are active components in the tailing consolidation process, which can generate new crystal and gelatinous minerals. This is the main reason for the difference of consolidation microstructure.
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Keywords:
- slag cement /
- tailings /
- consolidation /
- hydrates /
- microstructure
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