某金矿尾矿提纯石英应用对比试验研究

针对某金矿，在回收金银的基础上，对金银浮选尾矿进行云母和长石浮选，以及提纯石英试验，最终获得SiO2品位99.91%的石英产品。提纯石英产品与比利时矽比科矿业有限公司石英产品进行对比试验，通过化学成分、粒度组成、熔制、粘度和热膨胀系数测试对比试验，得出金矿提纯石英达到甚至超过矽比科进口石英产品的各项技术指标。     

Modelling and development of recycled water conditioning of copper-molybdenum ores processing

Current use of enrichment and processing technologies of ores requires the introduction of closed circuits of water treatment. A decrease in technological properties is caused by accumulations of ion-molecular components in the circulating water. The objective of the simulation is to determine the maximum allowable concentrations of ions and molecules as well as the choice of conditions for deposition or adsorption. First of all, our examinations decrease the concentration of copper ions and fatty acids in the circulating water. By pre-mixing water with the highest concentration of these ions, a reduction of copper ion and fatty acid concentrations in the recycled water occurs. The results do not only ensure the achievement of the maximum permitted concentration (MPC) of copper and iron, significantly reducing the amount of oxidized copper, they also make it possible to use the united sewage as current water for the flotation process. Mixing and adding filtrate of tailings, discharges of urban wastewater treatment and effluent of ash pit of thermal power stations (TPS) to recycled water causes an increase in the capacity of the enrichment plant by 15–17%.     

利用矿山固体废物料固结矿区路面的试验研究

白云鄂博西矿铁矿尾矿泥和甩尾碎石是矿山选矿厂排放的主要固体废弃物。利用尾矿泥代替砂、甩尾碎石代替级配碎石，采用碾压混凝土工艺进行矿区路面修筑，是改善矿区运输道路路况，延长汽车使用寿命的根本性措施。试验取得了其最佳含水量和最大比重的指标，28 d抗压强度达到18 MPa以上。工业试验路面选择在矿区主运输坡道上，一共做了4块,路面总长66.5 m，宽9.0 m，面积约600 m2，用料量共计165 t。根据路面混凝土芯样强度试验结果,尾矿泥碾压混凝土平均强度在18 MPa以上。     

Effect of geomembrane hole geometry on leakage overlain by saturated tailings

Experiments are conducted to quantify leakage through holes in a geomembrane (GMB) overlain by tailings with 30% fines and underlain by a well-graded gravel. Analytical and empirical equations for predicting leakage through a circular hole are used to analyze the data. Test results show that changing the hole shape from circular to noncircular increases the leakage. Leakage through 2000 mm² triangular, diamond, and square holes are all 15% higher than the 2000 mm² circular hole. An increase by up to 33% is observed for a rectangular hole. The analytical equations for predicting leakage and head loss through a hole given by the modified Rowe-Booker equation are experimentally verified. The spatial distribution of fines content within about five diameters of the hole is shown to have a notable impact on leakage. Up to a 100% increase in leakage is detected due to 3% reduction in the fines content around the hole. For homogeneous tailings, the ratio of head loss within the hole and above the hole to total head loss are independent of consolidation stress and water head and primarily depend on the hole geometry (i.e., shape and size). Finally, the combined effect of tailings thickness and water head on leakage is discussed.     

Microstructural,hydraulic conductivity and geochemical changes of drying mature fine oil sand tailings in column experiments

This study offers new insights into two-lift deposition of mature fine tailings under atmospheric drying. The interaction of newly added lift and former lift(s) was evaluated using column experiments in terms of volumetric water content, electrical conductivity (EC), hydraulic conductivity, geochemistry and microstructure. Water content and EC followed the same trend and decreasing of water content appears to be responsible for significant reduction in EC. Evaporation on top of the column reduced the water content to almost zero. The obtained results support the coupling between the hydraulic and chemical processes that should be considered by active operators.     

尾矿砂 PVA 水泥基复合材料抗压和抗弯性能试验研究

研究了在不同尾矿砂替代率、纤维掺量和纤维长度对尾矿砂水泥基复合材料的增强和增韧作用。试验验结果表明,尾矿砂替代 PVA 水泥基复合材料中的细骨料工作性能和基本力学性能稳定,制备工艺满足要求;在纤维长度和掺量一定时,尾矿砂替代率为50%效果较好;纤维长度为12mm,掺量为26kg/m3时,PVA 可以使尾矿砂PVA 水泥基复合材料的延性明显增强。     

矾山磷矿尾矿回收铁试验研究

介绍了矾山磷矿磁选尾矿的矿物组成、铁的赋存状态、矿物嵌布特征以及用重选、重磁联合流程、磁选分别对其进行回收铁的试验研究情况。用磁选法粗选并进行粗精矿再磨再选，可获得含铁64．19％、回收率5．63％的铁精矿。     

铜绿山矿尾矿综合利用的研究与生产实践

根据铜绿山矿强磁尾矿的矿物特征 ,通过三种方案即再磨 -常规硫化浮选方案、水热硫化浮选方案和酸浸硫化浮选方案的对比试验 ,得出再磨 -常规硫化浮选方案是从铜绿山矿强磁尾矿中综合回收铜、金、银的最经济有效方案。该方案的技术特点是进行了预先磨矿及羟肟酸钠和黄药的联合使用。浮选尾矿再经重磁选 ,可再次回收铁。     

铀尾矿堆防氡覆盖分析

对铀尾矿堆的氡析出进行评价应采用全年全面积的平均氡析出率(?),即覆盖铀尾矿堆的防氡效率取决于该堆的性状、覆盖材料的性质和对空气渗流的控制程度。扩散系数小、孔隙度低、渗透性差的材料适于做覆盖材料。最后,文中给出了覆盖厚度的解析表达式。     

加速金属尾矿综合利用途径的探讨

金属尾矿数量大，占地广，污染严重，通过综合利用，除回收有用金属外，还可供建材原料，矿井充填料和复垦造田，均有利于节约资源和改善环境，是贯彻可持续发展方针的有效措施，文章介绍了综合利用现状并提出了改进建议。