从香花岭尾矿库中回收锡石的研究与生产实践

在对尾矿性质研究基础之上,进行了尾矿脱硫及锡石富集试验,发现从尾矿中浮选合格的铅锌混合精矿或者锡石精矿均存在较大难度,但采用浮选方法首先脱除尾矿中的含硫成分,继而采用摇床分选锡石是可行的,在生产实践中获得了合格的锡石精矿.     

尾矿库排洪系统型式与方式选择

尾矿库排洪系统通常由进水构筑物和排水构筑物组成。文章介绍尾矿库排洪系统类型、工作方式及其特点与适用条件。尾矿库的排洪系统具有进水口多,水流流态复杂等特点,其水流形态与常见的水利工程泄水建筑物过流有较大的差别,如何选择尾矿库排洪系统,涉及尾矿库的安全及经济性。     

Preparation and properties of a core-shell styrene-acrylic copolymer modified adhesion mortar using iron tailings as the aggregate

In this paper, the core-shell poly (styrene-hydroxyethyl methacrylate) copolymer was synthesized by emulsifier-free emulsion polymerization. The microstructure of the polymer was characterized by fourier transform infrared spectrum, scanning electron microscope (SEM), and the laser particle size analyzer. Using it as the modifier, iron tailings as the aggregate and eco-cement as the cementing material, a new adhesion mortar was prepared. Results showed that the core-shell cross-linked poly (styrene-hydroxyehyl methacrylate) could substantially improve the modified-mortar’s bond strength compared to the mortar with commercial EVA as the modifier. SEM images of the modified mortar illustrated that the polymer may have three effects: (1) partially obstructing the fine pore network inside of hydrates; (2) filling the large pores; and (3) forming membranes. All these effects improve the mortar’s adhesion properties combinedly.     

含金多金属混合矿选矿试验研究

通过对洋鸡山金矿含金多金属混合矿的两个选矿工艺流程的研究及分析比较，铜优选浮选－－硫精矿焙砂氰化－－尾矿全泥氰化工艺流程比浮选－－氰化－－浮选工艺流程优越，技术可行，经济合理。     

Submarine mine tailings management

The placement of mine tailings at depth in the marine environment is reviewed. This review considers first the engineering aspects of a pipeline system which transports tailings slurry from a process plant to the coast and then to a location at a depth of typically 200 m on the continental slope. Next, the fluid dynamic behaviour of the tailings, once discharged from the end of the pipe, are discussed, and a numerical model is presented which simulates the fate of both the dissolved and solids component of the tailings slurry in the marine environment. This latter model can be used to estimate the environmental impact of a proposed deep sea tailings placement system.     

响洪甸铀尾矿处置场放射性污染与治理方案

安徽省金寨县响洪甸乡曾有一个集采、冶铀一体的小型厂，80年代退役时，就地掩埋了约49kt铀尾矿渣及部分废弃设备。随着时间的推移，这一“处置场”成了一个可能产生重大污染事故的隐患，造成不良的社会影响。为了根治这一隐患，必须采取彻底治理措施，为此将付出几百万元的代价。     

Recovery,characterization and conceptual modelling of Non-Bituminous organic materials from oil sands

The hot water process has recovered approximately 90% of the bitumen in oil sands, but the remaining 10% of bitumen and naphtha has been lost to the tailings pond. Recovery of bitumen and non-bituminous combustibles (NBC) from centrifuge, scroll and final tailings has been considered. The effects of four sequestering agents, and of chemical additives such as CaCl₂ and FeCl₃ on the flotation behavior of bitumen, NBC and minerals in these tailings have been investigated. A simple method of isolating NBC materials has been developed. The flotation of both bitumen and NBC was enhanced by phosphate treatment and depressed by EDTA. NBC was characterized by its physical properties, energy content, functionality and chemical analysis. A conceptual model explains the interactions between the bitumen, minerals and NBC fractions present in tailings slurries.     

基于响应面法的碳酸钠活化铜尾矿胶凝性能机制研究

为了有效激发铜尾矿活性制备性能良好的胶凝材料,以铜尾矿为主要原材料,水玻璃和NaOH为碱激发剂,采用响应面优化法开展胶凝材料配比优化实验,并通过方差分析以及三维曲图研究自变量及其交互作用对28d抗压强度的影响；利用XRD、SEM、FT-IR、TG-DTG等对试样的矿相成分、微观形貌等特征进行分析。结果表明：通过优化实验获得最优配比为碳酸钠掺量50%、氢氧化钠掺量1%、水玻璃掺量22g/100g,此参数下铜尾矿胶凝材料28d抗压强度为30.41MPa。经过机械球磨40min后,碳酸钠在适当的碱性环境下使铜尾矿的活性激发到较佳状态,铜尾矿经水化反应生成了大量结晶度较高的C-S-H凝胶与棱柱状钙钒石等水化产物,彼此相互连接构成网状结构,使胶凝材料保持较高的强度性能。     

尾矿库筑坝土石料大型三轴试验与力学模型研究

针对沙溪铜矿龙王顶尾矿库工程初设土石坝建设方案,配置了3种含石量(5%、15%和30%)的筑坝土石料,开展了常围压条件下的大三轴压缩试验。试验表明,在低围压下土石料表现出明显的剪胀变形,在高围压条件下其变形以剪缩为主。随试样含石量从5%增加至30%,土石料的应力应变曲线形态相似,但强度和剪胀效应均明显增大。基于试验成果分析,构造适用于描述土石料剪缩/剪胀变形规律的塑性加载和流动方向矢量。在广义塑性本构模型框架内,建立了一个适用于土石料的弹塑性力学模型,阐述了模型参数的确定方法。将此力学模型应用于土石料的大型三轴试验模拟,发现该力学模型能较好地模拟土石料的剪缩/剪胀变形规律。     

Effectiveness of wetlands in retaining metals from mine water,South Africa

Wetlands are effectively used to treat mine water effluent in South Africa, where they retain toxic metals that can potentially contaminate the environment. Wetlands that are located close to the abandoned tailings dams were chosen and solidified substrate samples were collected for thin section microscopy, X‐ray fluorescence (XRF) and X‐ray diffraction (XRD) analyses. In order to determine the concentration of selected metals in the tailings dams, fine grained samples were collected and leached with a diluted nitric acid and deionised water to simulate leaching by rainwater. The results from the substrate analysis revealed an overall oxide abundance of 71.76 weight percent (%) and an elevated metal concentration, which suggest a crucial role played by pH, redox, wetland sediments and wetland plants in maintaining oxygen circulation and triggering reactions. The study confirmed the efficiency of wetlands in the attenuation of toxic metals from the mine water.