层状BiOCl—云母珠光颜料的研制

介绍了氯氧化铋（BiOCl)、BiOCL-云母及Ti或Zr改性的BiOCl－云母珠光颜料。经测试表明，Ti或Zr改性的BiOCl－云母珠光颜料的光泽及耐候性大大提高，并分析了该改性方法提高BiOCl珠光颜料的光泽及耐候性的机理。     

Mechanical behavior of micaceous clays

This study aims to investigate the effect of mica content on the mechanical properties of clays.Commercially available ground mica was blended with a locally available clayey soil,at varying nica contents by mass of 5%,10%,15%,20%,25% and 30%,to artificially prepare various micaceous clay blends.The preliminary testing phase included consistency limits and standard Proctor compaction tests.The primary testing program consisted of unconfined compression(UC),direct shear(DS) and scanning electron microscopy(SEM) tests.The test results showed that the liquid and plastic limits exhibited a linear,monotonically increasing trend with increase in mica content.The rate of increase in the plastic limit,however,was found to be greater than that of the liquid limit,thereby leading to a gradual transition towards a non-plastic,cohesionless character.The soft,spongy fabric and high water demand of the mica mineral led to higher optimum water contents and lower maximum dry unit weights with increasing mica content.Under low confinement conditions,i.e.the UC test and the DS test at low normal stresses,the shear strength was adversely affected by mica.However,the closer packing of the clay and mica components in the matrix under high confinement conditions offsets the adverse effects of mica by inducing frictional resistance at the shearing interface,thus leading to improved strength resistance.     

国外某萤石矿尾矿中锂铷回收试验

国外某萤石尾矿中的Li₂O、Rb₂O含量分别为0.49%和0.37%，赋存在云母矿物中的锂、铷占总锂、铷的55.56%和56.14%，其余的锂、铷赋存在其他铝硅酸盐矿物中。云母矿物的粒度主要为0.01～0.15 mm，解离度高达87%，后续选别无需再磨矿。为确定锂铷回收工艺，进行了选矿试验研究。结果表明，试样在矿浆pH=4.5的情况下，以十二胺（280 g/t）为捕收剂、十二烷基苯磺酸钠（60 g/t）为泡沫调整剂，采用1粗3精、中矿顺序返回流程处理，可获得Li2O、Rb2O品位分别为1.07%和0.79%，Li2O、Rb2O回收率分别为46.32%和45.29%的锂铷混合精矿，较好地实现了锂铷的综合回收。     

Structural analysis and characterization of doped spinel Co2−xMxTiO4 (M=Mg2+, Mn2+, Ni2+, Cu2+ and Zn2+) coated mica composite pigments

A new kind of composite mica pigments were prepared by coating Co_2−xM_xTiO₄ composite oxide nanoparticles onto mica, to investigate the effects of doping ions Mg²⁺, Mn²⁺, Ni²⁺, Cu²⁺ and Zn²⁺ on the properties of the doped composite pearlescent pigments, such as the crystal structure, color and shading power. The structure, morphology, color and shading power of the coated pigments were characterized by the X-ray diffraction (XRD), scanning electron microscopy (SEM), UV–vis spectrophotometer and CIE L*a*b* methods. SEM images of coated pigments showed that mica were coated uniformly with a single layer of dispersed nanoparticles. Research of the doped composite pigments showed that the doping ions had entered into the spinel crystal structure, forming a new kind of composite mica pearlescent pigments coated with Co_2−xM_xTiO₄. For the analysis of color and shading power of the pigments, doping of Ni²⁺ and Zn²⁺ can improve the color and shading power of the doped pigments, but the larger dosage of Zn²⁺ doping can weaken the color and shading power of the doped pigments. Doping of Mg²⁺, Mn²⁺ and Cu²⁺ metal ions can also weaken the color and shading power of the doped pigments.     

广西某高岭土尾矿产石英砂浮选除铁试验

广西某高岭土尾矿经擦洗、磨矿、分级、强磁选可产出SiO₂品位达99.82%的石英砂，但其Fe₂O₃含量较高，为113 μg/g，且铁主要赋存于云母和电气石中。为将该石英砂的Fe₂O₃含量降至80 μg/g以下以满足光伏产业用石英砂的要求，对其进行了除铁即脱除云母和电气石的浮选试验。试验结果表明：先在pH=2.5的酸性条件下用混合胺和煤油进行1次云母反浮选，然后在pH=7.8的偏碱性条件下用油酸钠进行1次电气石反浮选，所得最终石英砂的Fe₂O₃含量可降至74 μg/g，SiO₂品位提高至99.89%，SiO₂回收率为94.61%。     

60m涂层线烘箱技术改造

通过对涂层线烘箱电热管接线方式和控制方式的技术改造,达到烘箱内温度平稳调节,实现亲水铝箔高质量的热处理,保持生产设备持续、高效、经济地运行,改造后实践证明取得了很好的经济效益。     

某复杂多金属矿低尾化综合利用技术研究

矿产资源在选矿过程中产生的大量尾矿,既是资源的浪费,又是环境污染源。因此,开展低尾化乃至无尾化综合利用研究,最大程度提高资源利用率是未来矿产资源开发、利用的必由之路。本文在研究国内某复杂多金属矿综合利用时,通过分析所含矿物的基因属性、赋存状态以及嵌布关系,先后进行了钽铌精矿、方解石精矿、锂精矿、云母精矿、长石精矿、石英精矿共计6个产品的选别回收,实现了除少量泥质、铁屑之外的全产品、无尾化综合利用技术路线,可为以后同类型复杂多金属矿的综合回收提供思路借鉴。     

Negative staining-carbon film technique: New cellular and molecular applications

Two techniques are presented which extend the original negative staining-carbon film technique into new areas of cellular and molecular application. These relate (1) to the production of negatively stained specimens of single-layer plasma membrane split from intact cells during the overall procedure that are negatively stained from the cytoplasmic face and (2) to the production of negatively stained specimens directly from glycerol-containing protein solutions, membrane or viral suspensions. In both cases in vacuo drying onto mica from glycerol is performed, prior to deposition of a carbon film. (For the cellular technique, freshly cleaved mica is firstly rendered positively charged by immersion in Alcian blue.) This is followed by release of the carbon film plus adsorbed membrane or protein by floating onto water, with subsequent negative staining. Selected preliminary applications using human erythrocyte membrane and the high molecular weight (native) human erythrocyte tripeptidyl peptidase-II complex are given and considered speculation as to the future application of the techniques is provided.     

Significantly improved stability of n-octadecyltrichlorosilane self-assembled monolayer by plasma pretreatment on mica

It has been well known that plasma pretreatment can stabilize the hydrocarbon silane monolayer self-assembled on a mica surface. However, the extent of this improvement is not well known. To explore this issue, n-octadecyltrichlorosilane (OTS) monolayers were self-assembled on both untreated and plasma-treated mica surfaces, and their interfacial properties were investigated and compared at various physical conditions (temperature, relative humidity, contact time, high stress, and contact repetition) through the use of surface force measurements. This study revealed that in highly humid conditions (> 90% relative humidity) there is a substantial difference of stability between untreated and plasma-treated surfaces, the OTS monolayer on plasma-treated mica surface being much more stable. In particular, protrusion behavior in the monolayer was always observed in untreated samples, but never in plasma-treated samples during contact repetition experiments. This directly demonstrates that the significantly improved stability directly comes from extensive chemical bonds between OTS molecules and the plasma-treated mica surface.     

云母波片属性的分光光度计标定法

利用分光光度计测定了云母波片偏光透射干涉谱，通过对该光谱理论和实验上的分析，提出了云母波片属性的分光光度计标定法。利用该方法可以准确标定波片的1／2或1／4属性以及波片的快慢轴方向。