山西宽草坪铝土矿矿床地质特征及找矿方向

通过对山西省宁武县宽草坪矿区进行矿床勘探的实际工作,掌握并论述了该矿床的矿床地质特征,在分析该矿床的形成机制的基础上,对该区的找矿和勘探提出了建设性的建议.     

五台县天和铝土矿区矿床特征及成矿规律研究

在总结以往地质成果的基础上,通过研究对比,就五台县天和铝土矿区矿床特征和成矿规律进行了探讨,以提高矿床研究水平,指导普查找矿工作。     

聚硅酸铝铁处理印染废水的研究

以硫酸铝渣为主要原料制备聚硅酸铝铁絮凝剂并对其絮凝性能进行了研究.实验结果表明:处理蒽醌型分散黄染料时,铝、铁总浓度(简记为M)对脱色有重要影响,但铝、铁相对含量无显著影响;使用n(M)∶n(S iO2)=1.0、n(A l)∶n(F e)=1.0的聚硅酸铝铁,用量为每升1.0 mL,分散黄溶液pH 6~10时,脱色率为90%左右.处理工业印染废水,当聚硅酸铝铁n(M)∶n(S iO2)=1.0、n(A l)∶n(F e)=1.0~3.0,用量为每升2.0 mL时,脱色率达90%左右;与聚合氯化铝相比,聚硅酸铝铁在CODC r去除率方面有明显优势.采用透射电镜对处理工业印染废水的机理进行了探讨.     

贵州高硫铝土矿溶出性能研究

研究贵州高硫型高品位铝土矿溶出性能，考查石灰添加量、溶出温度、苛性碱浓度和溶出时间对氧化铝溶出率的影响以及铝土矿的硫向溶液中的转化率(即硫的溶出率)的影响。实验结果表明，溶出高硫铝土矿较适宜的条件是：温度260℃，碱浓度195g/l，石灰添加量CaO12％，时间50min．此时，氧化铝溶出率高于88％，硫的溶出率低于13％．     

矿制载体及其催化剂的比表面积和孔径分布

采用色谱法测定了矿制载体及其制备的ＣＯ中变催化剂和ＣＯ耐硫变换催化剂在还原前、后的比表面积及孔径分布的变化情况,并对其结果进行分析．     

力化学对铝土矿溶出的作用

力化学方法处理铝土矿,可明显改善其溶出性能．对国内２种有代表性的铝土矿：广西平果矿和山西普铝矿采用该法处理,使矿石中的一水硬铝石结构发生变化,从而降低了溶出温度及溶出用碱液浓度,并提高了溶出速率．对力化学引起的反应性能变化及其内在原因进行了探讨．据此确认该法对我国氧化铝工业节能降耗、提高经济效益具有实际意义．     

碳酸盐在铝土矿溶出过程中的脱除行为

采用XRD,XRF,SEM-EDS和PSD等检测手段,系统研究了不同石灰添加量、溶出温度、晶种添加量和碳酸盐质量浓度下一水硬铝石型铝土矿高压溶出过程中铝酸钠溶液中碳酸盐含量的变化规律及其脱除机理.结果表明:铝酸钠溶液中碳酸盐质量浓度为25 g·L^-1时,氧化铝溶出和碳酸盐脱除的最佳条件为:石灰添加量为11%,溶出温度为270℃,此时氧化铝的溶出率和碳酸盐的脱除率分别为72.47%和68.95%.具有板条状结构的霞石(Na₆(Al₆Si₆O₂₄)·Na₂CO₃·2H₂O)为脱除碳酸盐时的主要产物.铝酸钠溶液中碳酸盐质量浓度在25 g·L^-1以下时碳酸盐更易脱除.     

鹤庆照壁山铝土矿地质特征

照壁山铝土矿赋存于中三叠统北衙组与上三叠统中窝组的不整合接触面上。富矿围岩为上三叠统中窝组灰岩。沉积相为局限海湾-泻湖-潮间相。铝矿物主要为一水软铝石。矿石结构主要为豆状-鲕状结构,矿床成因为古风化壳沉积型。     

广西平果铝太平矿区外围铝土矿矿体地质特征

广西溶型堆积铝土矿的典型代表为平果铝,在其太平矿区外围北东面新发现了100多个堆积铝土矿矿体群。对其地质特征进行了详细论述,总结了找矿标志,为寻找该类型矿种提供了参考。     

Thixotropic behaviour of concentrated bauxite residue suspensions

An experimental study on the time-dependent rheology of highly concentrated and flocculated suspensions of bauxite residue (red mud) is presented. Both the thixotropic breakdown with shear and recovery at rest have been quantitatively examined using a vane-shear instrument and a capillary rheometer. It is demonstrated that both the yield stress and the apparent viscosity of the material can be drastically reduced, by orders of magnitude, by shear-induced agitation with a simple anchor impeller. The rate of thixotropic decay is a function of solids concentration, agitation time and speed. With prolonged agitation, the flow properties are brought to an equilibrium level characterized by a finite yield stress and a shear rate-dependent (shear-thinning) viscosity. In the absence of shear, the yield stress gradually increases with time but at a rate considerably slower than the rate of decay in the shear field. Even after an extended rest period of several months, only a fraction of the initial yield stress can be regained. The observed behaviour has been interpreted in terms of a time-dependent but non-reversible transformation of a network structure of flocculated particles initially developed in the red mud. Using a structural kinetic approach, models have been developed for correlating the experimental kinetic data. The paper concludes with a discussion on the practical consequences of the work. D Diameter of capillary tube - k ₁ Breakdown rate constant in eq. (2) - k ₁ Modified rate constant in eq. (7) - k ₂ Recovery rate constant in eq. (8) - N Impeller rotational speed - P Pressure - t Agitation (mixing time) - t Resting (aging) time - V Average velocity - Average mixing shear rate - Apparent viscosity ( _w/(8V/D)) - _w Wall shear stress - _y Yield stress - _y ^E Yield stress at infinite resting time - Dimensionless structural parameter - e Equilibrium condition (t ) - o Initial condition (t = 0) - Conditions att and