钒钛磁铁矿选铁尾矿中硫钴资源综合回收研究

本文以工艺矿物学为基础,研究从攀西某钒钛磁铁矿选铁尾矿中回收硫钴资源的关键因素和工艺流程。研究结果表明,含钴黄铁矿、黄铁矿和磁黄铁矿的分离是实现选铁尾矿中硫钴资源综合回收的关键,强磁选是实现含钴黄铁矿分离的有效措施,采用浮选—精矿再磨再选—高场强阶段磁选工艺可以得到含钴0.40%、含硫50.45%的钴硫精矿,钴和硫回收率分别为6.74%和19.07%,同时得到含硫37.23%、硫回收率20.81%的硫精矿,实现选铁尾矿中硫、钴资源的综合回收。     

金属尾矿中的FeS2在水泥烧成中的节能作用分析

金属尾矿的堆弃是自然环境的一大公害，如果能所废弃的金属尾矿变成商品生产的一种原料，将是十分理想的，对含FeS2较高的金属尾矿做了多方面的实验研究，分析其应用于水泥原料中产生的各种效益，结果得出其能产生明显的节能效果，此外还可降低成本，保护环境。     

Thermal performance of a combined packed bed–solar pond system—a numerical study

Solar ponds have recently become an important source of energy that is used in many different applications. The technology of the solar pond is based on storing solar energy in salt-gradient stratified zones. Many experimental and numerical investigations concerning the optimum operational conditions and economical feasibility of solar ponds have been published in the last few decades. In the present study a modified solar pond with a rock bed inserted at the bottom is suggested and investigated. In order to conduct this study and predict the thermal performance of the combined system, a one-dimensional transient numerical model is developed. The boundary conditions are based on measured ambient and ground temperatures at Kuwait city. The model is validated for standard plain salt-gradient solar ponds and is then used to examine the thermal performance of the combined storage system for different rock material and bed geometry. It has been shown that the storage temperature is remarkably increased when low thermal diffusivity rocks (such as Bakelite) are used in the packed bed. Meanwhile, when high conductive rocks are used, the thermal storage temperature considerably deteriorates and the temperature variations amplitudes are almost flattened out. The bed geometry also plays a significant role in the storage process. As expected, an appreciable gain in the storage temperature was obtained for thicker rock beds. Low porosity rock beds, as well, produce higher storage temperatures in the storage zone.     

Solar ponds: A review

This review covers salt-gradient solar ponds and their applications. It traces the historical development since the physical phenomenon of salt-gradient solar ponds was discovered in 1902. It also discusses considerations such as stability criteria and the establishment and maintenance of the salt gradient. It outlines the basic thermophysical processes and considers the three zone configuration of the pond. The paper reviews thermal modelling of solar ponds including analytical and numerical models. It briefly presents construction, operation, end use technology and economics aspects. Note is taken of such innovative concepts as gel or viscosity ponds, membrane ponds and saturated salt ponds.     

滁州铜鑫矿业有限公司尾矿综合利用实践

尾矿综合利用是矿山寻求可持续发展的一种途径,实现矿山固废零排放是彻底解决尾矿库库容安全,达到保护环境的效果。通过大量的试验与实践研究,采用浓缩—压滤生产工艺对尾矿进行脱水滤干,滤干的尾矿可作为水泥和建材的加工辅料,解决了尾矿出路。     

Geopolymerisation of a silica-rich tailing

A silica-rich tailing from vanadium extraction has been used for geopolymer synthesis in combination with metakaolin (MK) as an additional-Al source. Results show that alkaline roasting pretreatment effectively enhance geopolymerisation ability of the tailing in terms of XRD analysis and leaching tests. Strengths of samples can be improved by adding proper quantities of MK, or appropriately raising curing temperature. Curing temperature also affects the Si/Al ratio since higher curing temperature is more favorable for releasing Al. The highest compressive strength of 55.7 MPa can be obtained.     

某铀矿尾矿区周边土壤环境质量评价

进行铀矿尾矿区周边土壤环境质量评价可为铀矿尾矿区治理和污染土壤修复提供科学依据。以我国某铀矿尾矿区为研究对象,在采样监测的基础上,应用内梅罗(N.L.Nemerow)模型,以Cd、Pb、Ni、Zn、Cu、Cr等6种重金属作为评价因子,对铀矿尾矿周边土壤进行了环境质量评价。结果表明,该铀矿尾矿区周边土壤中Cd严重超标,整体尾矿区周边土壤环境质量已超过警戒级的水平,受到了重金属污染,但铀尾矿库对周边土壤基本上没有造成污染。     

炼铜尾渣提取重介质产品的特性及矿物学分析

资源绿色开发和冶炼废渣的高效利用成为战略技术需求。本文结合炼铜尾渣的矿物学性质和重介质选矿的现实需求,采用分级-磁选-浓缩脱泥流程获得炼铜尾渣重介质产品,采用化学分析、XRD、SEM和EDS等手段,考察了其化学成分、物相组成及残余铅锌杂质的矿物学特征,探讨了炼铜尾渣重介质产品应用的环境影响。研究表明：重介质产品密度为4.42 t/m3,含铁(TFe)56.57%、SiO2含量为23.49%,少量Pb、Zn、Cu等金属杂质;主要矿物为磁铁矿、铁橄榄石、铅铁硅质玻璃体和石英,含量达99.41%。因磁铁矿和铁橄榄石的嵌布粒度较细,解离度低,磁性物含量可达95.4%,便于回收使用;残余铅锌铜重金属元素溶出率很低、环境影响风险较小,为炼铜尾渣的资源化应用开辟了新的途径。     

尾砂水力充填材料的制备与输送试验研究

介绍了尾砂水力充填材料的制备与输送系统在矿山中的具体应用，并对水力输送尾砂进行了计算说明。地表采用塔架吊索铺设充填管路及采用钢绳下放固定充填管，节省了大量工程量，取得了良好的技术经济效益。     

桩西联采油废水氧化塘去除COD的数学模型

基于动力学和水力停留时间分布研究结果，研究了带纵向扩散的推流式反应池模型(模型Ⅰ)和完全混合式反应池串连模型(模型Ⅱ)对桩西联合站采油废水氧化塘的适用性。给出了两种数学模型中包含的各参数的数值或表达式，其中包括：扩散准数Pe=0．780，COD降解速率常数K(28．8℃)=0．07175h^-1，K值温度系数θ=1．054，COD生化降解率27%，平均水力停留时间tM=75h。2001年7月进行16次测试，得到氧化塘平均出口COD值(CODe)=127．6mg／L(平均水温TM=35．8℃，平均进口COD值169．4mg/L)，按模型Ⅰ计算,CODe=126．2mg／L，相对偏差为-1．10％，按模型Ⅱ计算，CODe=126．5mg／L，相对偏差为-0．860％。用模型Ⅰ和Ⅱ计算的2000年12月到2001年8月9个月的月平均CODe值(月平均水温TM在10．9～36．0℃)，与平均实测值的相对偏差范围分别为-4.50％～ 4.52％和-4.42％～ 4．18％，相对偏差平均值分别为 0．453％和 0．581％。这两个数学模型均可用于废水氧化塘的处理结果预测和设计。表2参4。