棉花坑矿床细粒花岗岩黑云母微区地球化学特征及其地质意义

对粤北棉花坑铀矿床细粒黑云母花岗岩中的黑云母进行了系统的矿物化学分析,旨在探讨黑云母对成岩成矿作用的指示意义。电子探针(EMPA)测试结果显示,细粒花岗岩中黑云母富FeO_T、TiO₂,贫MgO、Al₂O₃,属铁叶云母。Fe^₂₊/(Mg+Fe^₂₊)比值介于0.89~0.93,TiO₂/MnO比值介于2.89~4.59,并显示贫钙的特征,为典型的岩浆成因黑云母;其F含量较高(平均为0.69%),表明岩浆熔体富F。激光剥蚀电感耦合等离子质谱(LA-ICP-MS)原位微量分析表明黑云母稀土总量较低,∑REE含量为13.85×10^_-6~25.18×10^_-6。轻重稀土比值LREE/HREE为1.04~1.69,显示出轻重稀土分馏不明显。球粒陨石标准化的稀土元素配分模式呈典型的平缓“V”字形,且具明显的Eu(δEu为0.016~0.021)负异常。在原始地幔标准化蛛网图中,黑云母相对全岩富集Rb、Ta、Nb、Sc、V、Co,而相对亏损Th、U、Sr、Zr等元素。估算得出黑云母结晶温度为437~502℃,氧逸度lgf (O₂)为10^_－18.7~10^_－20.8,表明其形成于低温、低氧逸度条件。上述特征指示寄主岩石为壳源成因的高分异S型花岗岩,与产铀岩体具相似特征,低温、低氧逸度和高挥发分氟含量等条件有利促使铀元素富集。     

北山地区碱滩山东早石炭世花岗闪长岩岩石地球化学及年代学特征

研究表明：碱滩山东花岗闪长岩LA-ICP-MS锆石U-Pb年龄为323.6±3.2 Ma,时代为早石炭世,岩石样品SiO₂含量介于66.37×10^_-2～69.44×10^_-2之间,具富钠(Na₂O＞K₂O),弱过铝(铝饱和指数(A/CNK)介于1～1.1之间)的特征,属弱过铝钙碱性岩石系列；岩石球粒陨石标准化稀土配分曲线呈右倾斜曲线,斜率较大,属轻稀土富集型；微量元素蛛网图表明岩石明显富集Rb、Ba、Th、U、K等大离子亲石元素,亏损Nb、P、Ti等高场强元素。综合区域背景分析表明：碱滩山东花岗闪长岩具有岛弧花岗岩地球化学特征,在R1-R2图解中落入碰撞前花岗岩区,其与研究区广泛分布的晚石炭世早期石英闪长岩、花岗闪长岩、二长花岗岩、奥长花岗岩等共同构成了类似于TTG岩石组合的特征,暗示了研究区在石炭世可能处于大陆边缘弧的构造环境。     

磁控溅射制备铝、钛掺杂钽氮化合物薄膜的微观结构与电学性能研究

采用反应射频磁控溅射法,在Al₂O₃陶瓷基片上通过共溅射的方式成功制备了Al-TaN和Ti-TaN薄膜,并通过调节Al和Ti靶的溅射功率以实现了掺杂,研究了掺杂元素变化对薄膜微观结构和电学性能的影响。结果显示,随着掺杂元素Al和Ti的增加,TaN薄膜的粗糙度逐渐增大,晶体结构逐渐向非晶转变;Al元素掺杂时,当Al靶掺杂功率由0 W升至70 W,薄膜电阻率由0.88 mΩ?cm增至82.72 mΩ?cm;Ti元素掺杂时,当Ti靶掺杂功率由0 W升至70 W,电阻率由1.03 mΩ?cm降至0.32 mΩ?cm。此时,随着Al和Ti靶材掺杂功率由0 W升至70 W,薄膜的TCR值分别从-1 313×10^-6 ℃^-1逐渐负偏至-3 831×10^-6 ℃^-1和从-1 322×10^-6 ℃^-1正偏至-404×10^-6 ℃^-1。该研究为溅射制备掺杂TaN薄膜提供了深刻的理论和实验基础。     

Zn2+-Mg2+-H2O系中和沉锌热力学分析及应用

湿法炼锌废电解液在冷冻结晶除镁时会生成大量ZnSO₄?7H₂O和MgSO₄?7H₂O组成的结晶产物,采用中和水解法实现结晶产物中锌、镁的分离回收。根据配位化学热力学平衡原理,绘制了298K时Zn^₂₊-Mg^₂₊-H₂O系热力学平衡图。结果表明：在pH为6.0~12.0范围内,锌离子优先沉淀析出;pH=8.0时,Zn(OH)_2(s)的条件溶度积pKs=15.6,溶液中[Zn]_T≤1.0×10^_-5mol/L。实验数据表明,在温度60℃、pH为7.0、反应时间80min的最优条件下,锌沉淀率达到100%,镁不沉淀;硫酸镁溶液经蒸发结晶得到MgSO₄?6H₂O,沉锌产物经稀硫酸浸出获得硫酸锌溶液和石膏产品。     

应变速率对马氏体相变非晶复合材料力学行为的影响

金属玻璃具有较高的硬度、高断裂强度和良好的耐腐蚀性能，但室温塑性较差而限制了广泛应用，因此在金属玻璃中引入晶体以提升金属玻璃的力学性能。通过分子动力学模拟研究非晶/晶体双相复合材料，有助于深入理解非晶/晶体双相复合材料的性能和变形机制。采用分子动力学模拟方法研究了不同应变速率对金属玻璃复合材料力学性能的影响，同时在300 K环境温度下对块状B2-CuZr晶体/Cu₅₀Zr₅₀非晶复合材料进行压缩实验。结果表明：随着压缩应变速率增加材料的整体强度提高，与应变速率为2×10⁸s^-1和2×10⁹ s^-1的样品相比，压缩应变速率为2×10¹⁰ s^-1时样品的屈服强度最高达7.8 GPa；随着压缩速率的增加，材料中晶体原子发生相变的数量也增多，样品中块状晶体没有发生明显的偏转，剪切带扩展路径受到阻碍；样品应力应变曲线上出现独特的二次硬化曲线，与另外两种应变速率下样品相比，压缩应变速率为2×10¹⁰ s^-1时样品的强度和塑性均有增加。该研究结果对于设计和制备高性能的金属玻璃材料有参考价值。     

黄陵花岗岩类岩基南部岩体侵入时代和同位素特征

采用 Rb-Sr.u—Pb 和 Sm-Nd 法测定了黄陵花岗岩类岩基南部各岩体的形成年龄。它们是:镁铁—超镁铁质岩体1368Ma;由闪长岩、石英闪长岩和英云闪长岩组成的三斗坪岩体为832±12Ma;主体期似斑状黑云母花岗闪长岩体为819±7Ma;细粒花岗岩脉769±1Ma。根据岩体的 Sr-Nd 同位素组成特征,认为岩基的形成是深源的,与亏损地慢和地壳组分的混合,以及岩浆分离结晶的联合作用有关。     

广东省揭西县发现花岗岩风化壳离子吸附型稀土矿

<正> 广东省揭西县在花岗岩风化壳中发现离子吸附型稀土矿。花岗岩原岩系斑状中粒黑云母花岗岩,时代系燕山三期 r_5~2(3),约153百万年。在花岗岩中石英含量35～40%,钾长石、斜长石含量45～50%,黑云母少量,呈鳞片状散布于岩石中。风化壳为褐、黄褐、灰褐色;表面因析出铁质呈砖红、紫红色。高岭土为乳白色,表面铁染为褐色。风化壳厚度15～20米,含矿层厚度大于10米。品位富集地段     

亚氧化钛块体电极的电化学特性及其对几种工业有机废水的降解效能研究

亚氧化钛电极Ti_nO_2n-1(4≤n≤10) 具有环境友好、导电性好、耐强酸强碱、析氧电位高等优异性能,在电催化氧化处理难降解有机废水领域中极具应用潜力。采用自制的亚氧化钛块体电极,研究该电极的电化学特性及其对多种难降解工业有机废水的降解效能,并表征该电极的组成和表面形貌。结果表明：该块体电极为表面多孔结构,电极表层的主相为Ti₄O₇,电极的粗糙系数约为500,能为电化学反应提供较大的活性比表面积;同时,其电化学电位稳定窗口可高达3.6 V,电化学交换电流密度为4.606×10^-2 mA?cm^-2,均高于DSA电极（2.3 V和1.861×10^-2 mA?cm^-2）;此外,该块体电极及DSA电极的电化学氧化降解亚甲基蓝（MB）的过程均符合准一级反应动力学方程,且反应动力学常数k_亚氧化钛=2.0 k_DSA。利用亚氧化钛块体电极对多种工业废水,如垃圾渗滤液、金属冶炼厂的残余液等样本进行了降解处理,上述废液的化学需氧量（COD_Cr）去除率均能达到90%以上,表明该电极装置能有效地处理难降解工业废水。     

凹凸棒石对Zn2+、Cu2+、Cd2+的等温吸附实验研究

凹凸棒石是一种比表面积大,吸附能力强的天然粘土矿物。为了研究凹凸棒石的吸附特征,通过等温吸附实验,进行了凹凸棒石对复合重金属离子Zn_²⁺、Cu_²⁺、Cd_²⁺的吸附容量、去除率、吸附选择性和富集系数的研究。结果表明： 凹凸棒石对Zn_²⁺、Cu_²⁺、Cd_²⁺吸附容量表现为随溶液初始浓度的增加而增加,吸附选择特征表现为对Cu_²⁺的吸附大于对Zn_²⁺和Cd_²⁺的吸附。凹凸棒石对 Cu_²⁺的去除率为96.76%,对Zn_²⁺andCd_²⁺分别为48.18%和38.84%。 富集系数与吸附特征反应的结果一致,并且吸附符合Langmuir 和Freundlich方程。研究结果表明凹凸棒石可用于水体和土壤重金属污染的修复。     

Er3+/Tm3+共掺碲酸盐玻璃1.8 μm波段光谱特性研究

为分析Er³⁺/Tm³⁺共掺碲酸盐玻璃的发光性能,得到1.8 μm处的高强度发光。采用熔融退火法,制备了Tm₂O₃掺杂浓度（摩尔百分数）为0.25%、0.5%、1%、1.5%和2%的75TeO₂-20ZnO-5La₂O₃-0.5Er₂O₃碲酸盐玻璃。对碲酸盐玻璃进行吸收光谱的测定,同时研究其在1.8 μm波段的光谱特性。吸收光谱测试结果表明：碲酸盐玻璃在800 nm附近的吸收峰为Er³⁺的⁴I_15/2→⁴I_9/2跃迁和Tm³⁺的³H₆→³H₄跃迁的叠加,说明两种稀土离子都得到了很好的溶解混合;发射光谱在1200—2200 nm范围内,在1.53和1.8 μm处出现了发射峰,且1.53 μm处的发光远弱于1.8 μm处的;1.8 μm处的发射峰是Tm³⁺离子在³F₄→³H₆跃迁产生的,由峰值波长分别为1740和1857 nm的分解谱线组成,此时该玻璃发生了荧光俘获效应,随着Tm₂O₃掺杂浓度的增加,1740 nm处分解谱线的相对强度逐渐降低,而1857 nm处分解谱线相对强度逐渐增大。该玻璃同时具有较大的受激吸收截面以及发射截面,有望成为一种新型的2 μm波段的激光玻璃材料。     

China rare earth market review

正November 21~30,2014Due to weak demand from downstream industries,transactions of rare earth in Chinese domestic market were inactive.It was difficult to sell any rare earth products except for dysprosium oxide and terbium oxide.Suppliers lost confidence in recent market.Demand for rare earth products was soft.Consumers continued to take a wait-and-see attitude.Rare earth export market remained slow.     

Current situation and future trend of China rare earth luminescent materialindustry(continued)

<正>Developing ecological lighting source The world is facing the big problem of energy shortage today and the contradiction between economy development and environmental protection is worsened.Therefore,people are more likely to choose an ecological light source that is more energy efficient and environmental friendly.The choice provides great opportunity for the development of rare earth optical material industry in China.The concept of green lighting positions rare earth luminescent material as a leading player in illumination market.The light source of both rare earth luminescent lamp and LED lamp is ecological and energy saving.This is why     

Galaxy Magnets achieved the net profit of 34.02 million yuan in the first six months of 2014

正Galaxy Magnet announced its financial results for the first half of 2014 on August 14.For the first six months ended on 30 June 2014,Galaxy Magnet achieved operation income of RMB 182.3 million,up8.40% over the same period of 2013,and the net profit attributable to the shareholders of the listed company of 34.02 million yuan,increasing 35.49% over the same period of last year.Stable performance increase was led by development of new customers and application market of magnets.     

Rare Earth Application in Steel in China

<正>China has rich rare earth resources.Output of rare earth and steel in China ranks the top first in the world.However,there is still certain distance between the steel produced in China and developed countries from the point of varieties and quality.China still has to import some types of steel.Improving the quality should be emphasiZed in future development of steel industry in China.Rare earth can be used to upgrade traditional steel     

稀散金属产业的观察与思考

分析了近年来国内外稀散金属产业的生产、应用、资源与市场状况.铟锡氧化物靶材、砷化镓晶片、锗红外材料、铼高温合金和硒在电解锰及玻璃的应用等已成为稀散金属的主要应用领域.稀散金属的产量快速增长达到历史高位而导致了市场的失衡.以GaInP_2/GaAs/Ge,CIGS和CdTe为代表的非硅系太阳能电池是稀散金属的新兴应用领域,将给稀散金属带来日益增长的需求.     

China rare earth market review

正November 1~10,2014Chinese rare earth market was still inactive.Demand for rare earth products was weak.Consumers took a wait-and-see attitude for lower price.As it was an off season for rare earth products,it was expected that prices of rare earth could continue turbulence at the bottom in short terms.Due to a sharp drop,demand for rare earth from downstream recovered.Affected by new energy vehicles,wind powder and energy-efficient appliances,production of rare earth permanent     

China rare earth market review

正August 1~10,2014 There was some good news in rare earth industry recently.Restructuring plans of rare earth groups led by Baotou IronSteel Group and Xiamen Tungsten Group respectively have been approved by MIIT.And rare earth storage policy,which had been expected for a very long time,has been launched officially.Pushed by the good news,rare earth price started to rebound since August 5.Price of didymium oxide and dysprosium oxide rose about 1% to 2%,averagely.About 10% of     

China rare earth market review

正July 1~10,2014Due to weak demand from downstream industry and slow transactions,rare earth market remained weak and price of rare earth products continued to decline.There was no sign of recovery in downstream market.The market of NdFeB magnetic materials and phosphor was depressed.Catalyst,     

New energy vehicle:an opportunity for rare earth magnets

<正>Extracted from Securities Guide 1.Popularity of new energy vehicles—an irresistible market trend1.1 Progress of new energy vehicles Chinese Premier Li Keqiang said recently on a visit to Xi'an BYD Autos that new energy vehicles,especially new energy bus,can lessen environment and noise pollution.He encouraged the use of new     

Brief news

正Corun invested another 50 million yuan in power battery for HEV Hunan Corun announced on 27 June that they had signed the cooperation agreement to jointly built Corun(Shaoxing)Autos Power Battery System Co.,Ltd.in Shaoxing Binhai New City.According to the announcement,total registered