单掺杂硅灰石∶Dy的荧光特性

采用高温固相反应合成出CaSiO3:Dy多晶粉末。X－射线衍射图显示，样品为α-CaSiO3和β－CaSiO3的混合相。样品在可见光区主要有峰值位于576nm附近的由^4F9/2→^6H13/2超敏跃迁（ΔJ＝2）产生的黄光发射和峰值位于486nm附近的由^4F9/2→^6H15/2跃迁产生蓝光发射，其中黄光发射是最强发射。Dy^3 离子在其中的发光，归结为占据没有反演中心的格位。     

过渡金属酪氨酸配合物热化学性质的研究

合成了过渡金属(铜、镍)与L-酪氨酸的固态配合物,通过化学分析、IR及TG-DTA对其组成及热稳定性进行了研究,确定了配合物的组成为Cu(Tyr) (Ac)2·3H2O和Ni(Tyr)Cl2·5H2O。用HWR-15型恒温式微机量热计测定了上述配合物的恒容燃烧能,并计算了它们的标准摩尔燃烧焓(△c Hφm)和标准摩尔生成焓(△f Hφm     

高纯超细氧化铝粉的制备(Ⅱ)--煅烧过程对氧化铝粉性能的影响

煅烧温度和时间对氧化铝粉的晶型和形貌有很大影响;氧化铝粉晶型的转变顺序及温度为:无定形氢氧化铝600℃,5h→无定形氧化铝800℃,5h→γ-Al22O3(θ-Al2O3,η-Al2O3)1000℃,5h→δ-Al2O3(θ-Al2O3,κ-Al2O3)1100℃,5h→α-Al2O3;将分散的氢氧化铝粉在1150℃煅烧5 h后制得球形的α-Al2O3粉末.     

单掺杂硅灰石∶Dy的荧光特性

采用高温固相反应合成出CaSiO3∶Dy多晶粉末。X 射线衍射图显示 ,样品为α CaSiO3和β CaSiO3的混合相。样品在可见光区主要有峰值位于 5 76nm附近的由4 F9/2 →6 H1 3/2 超敏跃迁 (ΔJ=2 )产生的黄光发射和峰值位于 486nm附近的由4 F9/2 →6 H1 5/2 跃迁产生蓝光发射 ,其中黄光发射是最强发射。Dy3+ 离子在其中的发光 ,归结为占据没有反演中心的格位。     

喷雾造粒-氟化转型-焙烧制备氟氧化钇中物相变化的研究

传统方法制备的氟氧化钇粉体粒径普遍在亚微米级，易团聚。我们采用喷雾造粒-氟化-煅烧的技术路线制备了球形氟氧化钇粉体。采用扫描电镜（SEM）、X射线衍射（XRD）、热重差热分析（TG）对样品的微观形貌、物相、受热时发生重量的变化等进行表征。结果表明，在焙烧过程中，YF3与O2发生反应，物相转变过程为YF3→Y5O4F7→YOF。在氟化前热处理温度200℃，氟化后焙烧温度800℃、焙烧时间120min的最佳工艺条件下，合成的氟氧化钇粉体分散性好，为微米级多孔球形。探讨了Y5O4F7向YOF转换的动力学。     

受限空间煤尘爆炸残留气体特征分析

采用20 L球形爆炸装置进行煤尘爆炸实验,研究了不同条件下煤尘爆炸后气体体积分数变化及生成规律。结果表明:爆炸残留气体成分及体积分数与煤尘浓度、粒径、点火能量以及煤尘变质程度关系密切。随煤尘浓度升高,爆炸后残留气体体积分数φ(CH4),φ(CO),φ(H2)及φ(CO)/φ(CO2)呈上升趋势,φ(CO2)呈先上升后下降趋势。一定范围内随煤尘粒径减小,φ(CH4)增大,φ(CO)及φ(CO)/φ(CO2)呈减小趋势,当粒径小于25μm时,φ(CH4)急剧减小。随点火能量增大,φ(CH4)及φ(CO)增大,φ(CO)/φ(CO2)整体变化量不大,当点火能量大于10 k J时,φ(O2)明显减小。随煤尘变质程度增加,φ(CO)/φ(CO2)先增大后减小,φ(CH4)整体呈降低趋势,烟煤煤尘爆炸消耗的O2量较褐煤、无烟煤少。     

铜冶炼渣中铁的生物炭深度还原—磁选回收试验

铜冶炼渣中铁含量达30%~40%,但铁元素主要以铁橄榄石的形式存在,采用传统方法难以回收利用。以可再生生物炭为还原剂,通过深度还原—磁选回收铜冶炼渣中的铁,考察了还原条件对铜冶炼渣深度还原的影响。当还原温度为1 200 ℃、还原时间为75 min、CaO用量10%、碳氧摩尔比为1.5时,深度还原产品的金属化率达到86.83%,经过磨矿磁选可获得铁品位为62.84%、回收率为81.92%的磁选精矿。铜冶炼渣中主要含铁矿物有Fe2SiO4、Fe3O4及少量的Fe2O3,其还原过程为Fe2SiO4→FeO→Fe、Fe2O3→Fe3O4→FeO→Fe,得到的金属铁逐渐聚集长大最终形成有利于磁选分离的金属铁颗粒。     

高纯超细氧化铝粉的制备（Ⅱ）—煅烧过程对氧化铝粉性能的影响

煅烧温度和时间对氧化铝粉的晶型和形貌有很大影响；氧化铝粉晶型的转变顺序及温度为：无定形氢氧化铝→600℃,5h无定形氧化铝→800℃,5h γ-Al2O3(θ-Al2O3,η-Al2O3)→1000℃,5hδ-Al2O3(θ-Al2O3,κ-Al2O3)→1100℃，2hα-Al2O3；将分散的氢氧化铝粉在1150℃煅烧5h后制得球形的α-Al2O3粉末。     

加压酸浸从某硫化物精矿中回收Cu、Ni、Co

PandeyB D 等人在《Trans InstnMin Metall (SectC)》1 1 1卷C49～ 1 1 0期上撰文 ,介绍用加压酸浸方法从某硫化物精矿中回收Cu、Ni、Co的研究成果。该精矿来自印度贾杜古特矿 ,Cu、Ni、Co品位分别为 1 5 %、1 0 85 %和 0 37% ,每年约 1 2 0 0t。由于氧气的氧化作用 ,使硫化物中的硫生成元素硫 ,从而可用H2 SO4浸出的手段对这些有价金属予以回收。对 p (O2 )、温度、矿石粒度、ρ( H2 SO4)等因素对金属回收率的影响进行了研究。主要结论是 :1 )随温度升高 ( 373→ 41 8K)和 p (O2 )增大 ( 1 0 85→ 5 1 95kPa) ,Cu、Ni、Co回…     

基于CHEMKIN-PRO的多元混合气体瓦斯燃烧模拟研究

针对多种不同性质气体对瓦斯燃烧过程的影响问题,采用CHEMKIN-PRO软件,构建USC Mech 2.0动力学模型对不同组分C_2H_4/CO_2瓦斯混合气体燃烧过程进行了深入研究,模拟分析了不同组分C_2H_4/CO_2瓦斯层流燃烧速率及H,O自由基体积分数的变化趋势,并利用SENKIN程序对其进行了敏感性分析。计算结果表明:随着CO_2体积分数的增大,层流燃烧速率降低,在φ1和φ1.25时分别降低了约13 cm/s和149 cm/s,H,O自由基体积分数降低,其协同抑制瓦斯燃烧;随着C_2H_4体积分数的增大,层流燃烧速率略微增加,在φ1和φ1.4时分别升高了约3和46 cm/s,H,O自由基体积分数升高,其协同促进瓦斯燃烧;在φ≤1条件下,随着当量比的增加,促进CH_4生成的关键反应步的敏感性系数升高幅度较大,其抑制瓦斯燃烧。     

Market and recycling of NiMH battery

<正>Market status and future trend of NiMH battery1.Global market of small NiMH battery Global market size of small NiMH batteries declined year on year since 2011.The trend will continue to 2018,at the rate of 5%to 10%annually.Demand for small NiMH batteries will be stable gradually.Many electrical apparatuses are powered by the built-in lithium battery today,which is the main reason for the shrunk market of small NiMH batteries.But,for some products,small NiMH     

China rare earth market review

正September 1-10,2014 Affected by the National Day holiday,rare earth transaction was stagnant and the market showed a weak steady state.As there was no good news for downstream market,some products with flat demand would likely rally slightly for some time to     

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     

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.     

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.     

Current situation and future trend of China rare earth luminescent material industry

<正>Rare earth luminescent material is one of the most important application sectors of rare earths.China enjoys the exceptional advantage to develop rare earth luminescent material for its abundant rare earth resources.After several decades'endeavor,China's rare earth luminescent material industry,headed by rare earth phosphor for lamp and LED and high efficient rare earth energy-saving light source,has been gradually developed into a scale industry.China has become a major production base of rare earth phosphor for lamps and rare earth     

China rare earth market review

正June 1~10,2014Rare earth market remained weak.Quoted price of rare earth products was similar to that in May.There was no sign of recovery in downstream market.The market of NdFeB magnetic materials and phosphor was depressed.Catalyst,polishing powder and ceramic industries remained inactive.Demand from downstream industry was soft.Consumers purchased on their needs.Suppliers had strong intention to sell.Prices of rare earth products     

2014 second batch of rare earth quota released

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