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Utilization of gold tailings as an additive in Portland cement

机译：金尾矿在波特兰水泥中的添加

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Mine tailings are formed as an industrial waste during coal and ore mining and processing. In the investigated process, following the extraction of gold from the ore, the remaining tailings are subjected to a two-stage chemical treatment in order to destroy the free cyanide and to stabilize and coagu-late heavy metals prior to discharge into the tailings pond. The aim of this study was the investigation of the feasibility of utilization of the tailings as an additive material in Port-land cement production. For this purpose, the effects of the railings on the compressive strength properties of the ordinary Portland cement were investigated. Chemical and physical properties, mineralogical composition, particle size distri-bution and microstructure of the tailings were determined by Fourier transform infrared spectroscopy (FTIR), X-ray diffrac-tometry (XRD), particle size analyzer (Mastersizer) and scanning electron microscope (SEM). Following the characterization of the tailings, cement mortars were prepared by intergrinding Portland cement with dried tailings. Composition of the cement clinkers were adjusted to contain 5, 15, 25 percent (wt/wt) dried tail-ings and also silica fume and fly ash samples (C and F type) were added to clinker in different ratios. The mortars produced with different amounts of tailings, silica fume, fly ashes and also mixtures of them were tested for compressive strength values after 7, 28 and 56 days according to the European Standard (EN 196-1). The results indicated that gold tailings up to 25 percent in clinker could be beneficially used as an additive in Port land cement production. It is suggested that the gold tailings used in the cement are blended with silica fume and C-type fly ash to obtain higher compressive strength values.
机译：矿山尾矿在煤炭和矿石的开采和加工过程中作为工业废料形成。在所研究的过程中，从矿石中提取金之后，对剩余的尾矿进行两阶段化学处理，以破坏游离的氰化物并稳定和共聚重金属，然后排入尾矿池。这项研究的目的是调查在硅酸盐水泥生产中将尾矿用作添加剂的可行性。为此，研究了栏杆对普通硅酸盐水泥抗压强度性能的影响。通过傅里叶变换红外光谱（FTIR），X射线衍射仪（XRD），粒度分析仪（Mastersizer）和扫描电子显微镜（尾部）测定尾矿的化学和物理性质，矿物学组成，粒度分布和微观结构SEM）。根据尾矿的特征，通过将波特兰水泥与干燥的尾矿互磨来制备水泥砂浆。调整水泥熟料的组成，使其含有5、15、25％（wt / wt）的干燥尾渣，并且还将硅粉和粉煤灰样品（C和F型）以不同的比例添加到熟料中。根据欧洲标准（EN 196-1），在7、28和56天后测试了不同尾矿，硅粉，飞灰及其混合物制得的砂浆的抗压强度值。结果表明，熟料中高达25％的金尾矿可作为波特兰水泥生产中的有益添加剂。建议将水泥中使用的金尾矿与硅粉和C型粉煤灰混合，以获得更高的抗压强度值。

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