H2O2—水杨基荧光酮指示反应体系动力学光度法测定痕量锰

在碱性介质中，痕量锰（Ⅱ）能显著催化H2O2氧化水杨基荧光酮的反应。本文据此建立了测定痕量锰的催化动力学分析法，测定条件为：4．0×10－5mol／L水杨基荧光配（SAF）0．012／H2O2，2．4×10-2mol／LNaOH，60℃。线性范围为0．1～2．0μg／L，方法检测限为0.02μg／L。测得反应表现活化能为20．78kJ／mol。测定了土壤、碳素钢及铝合金等样品中锰的含量，结果满意。     

中孔纳米二氧化钛光催化降解苯酚的研究

以溶胶-凝胶法合成中孔纳米二氧化钛，考察不同光降解反应条件下其对苯酚溶液的降解效果。结果表明，反应液pH在7～9。通氧速率为1g／L，光催化剂用量为0．3～0．4g／L时，光催化降解效果最好。制备的中孔二氧化钛由于其孔状结构使光催化效率明显高于P-25。     

氧化铁-云母纳米薄膜材料的制备研究

本文利用加碱中和法在天然白云母基片上沉积氧化铁纳米颗粒薄层，制备出Fe2O3—云母纳米薄膜材料，并探讨了实验条件对结果的影响，总结得到Fe2O3—云母纳米薄膜材料的最佳实验制备工艺参数。结果与分析表明，工艺条件如pH、温度等因素的不同设置，将带来不同的成膜效果，如薄膜材料的均匀性、包覆率，及其颜色。实验得到的Fe2O3—云母纳米薄膜材料的最佳制备工艺为：氯化铁溶液浓度为0．2mol／l，其用量与云母粉料比为11：1；成膜过程：pH值控制在3左右，反应温度为70～80℃，滴定速度为1．0～1．4ml／min；焙烧阶段：650℃、900℃煅烧2小时，即可获得带有金黄光泽的Fe2O3—云母纳米薄膜材料。     

MgO包覆LiCoO2的结构及性能

通过湿化学方法首先制得锂离子电池正极材料LiCoO2，以MgSO4和氨水为原料对LiCoO2进行表面包覆得到MgO包覆LiCoO2样品。扫描电镜(SEM)及光电子能谱对包覆样品的分析结果表明：MgO均匀地包覆在LiCoO2的表面；X射线衍射(XRD)图谱及晶胞参数表明：包覆MgO不改变LiCoO2的结构；电性能测试结果表明：MgO-LiCoO2比LiCoO2具有更高的可逆容量，其中当包覆量为0．5％～1．0％时，效果最好。     

氢化物发生原子荧光光谱法测定化妆品中的砷、汞

采用HNO3--H2SO4混合酸消化化妆品样品，氢化物发生原子荧光光谱法测定As、Hg，对仪器条件、HCl酸度、共存干扰进行了试验。As的方法检出限为0．0227μg／g，测定精密度0．9％～1．4％，回收率为96．0％～102.7％、Hg的方法检出限为0．171ng／g，测定精密度1．4％～2．0％，回收率为90．0％-105．0％。     

流动注射——树脂在线分离—分光光度法自动测定铌反萃取液中微量钽的研究

研究了铌反萃取液（合常量铌的溶液）中微量钽的测定。采用流动注射进样（18μL），用组成为1mol／LHCl＋1％HF的溶液作为上柱液，通过阴离子交换树脂柱吸附微量钽使之与大量铌分离，之后用组成为0．66mol／LNH4Cl＋0．33mol／LNH4F溶液作为钽的解吸液。解吸出的钽在缓冲液和络合剂存在下与溴邻苯三酚红-溴化十六烷基三甲胺反应，形成的紫色络合物停流3min后，在620nm和38℃条件下进行吸光度测定。方法可用于铌反萃取液中Ta2O5含量为0．05～0．5g／L的测定。样品的相标偏为±5％，回收率为90％～100％，分析速度约为7样次／h。     

密实移动床吸附塔吸附及多塔串联淋洗的研究

本文叙述300mm×6000mm密实移动床吸附塔对新疆七三七矿地浸液的吸附工艺试验结果。试验使用201×7强碱性阴离子交换树脂，与由下进料方式的原料铀溶液呈逆流操作，其传质高度6m。原料液来自地浸生产线，铀浓度为46～49mg／L，进料空塔线速度35～45m／h，树脂工作容量58～63mg／g（干）．尾弃铀浓度均＜lmg／L。淋洗采用四塔串联，传质高度1．8m，淋洗剂1mol／LNaCl＋0．05mol／LH2SO4，空塔线速度2m／h，合格液铀浓度6．6～7．7g／L，贫树脂含铀0．24～0．4g／L。结果表明，密实移动床吸附塔处理新疆七三七矿地浸液是适用的。     

用LIX 622从含砷铜／锌混合精矿加压浸出液中萃取铜

研究采用LIX622从含砷铜／锌混合精矿加压浸出液中萃取铜的工艺过程。含Cu10～15g／L，pH=1．0～1．2的加压浸出料液，采用22．58％LIX622-煤油体系，经过3级萃取、3级洗涤和3级反萃，萃余液中含铜可降到0．3～0．6g／L，平均铜萃取率达95．40％，反萃液满足电积工艺要求。     

脉冲电解制备纯铜的工艺条件

在小型电解槽中。研究脉冲电解法精炼铜的最佳工艺条件。脉冲电解参数为：平均电流密度500A／m^2，脉冲宽度6．0ms，脉冲间隔12．0ms。结果表明。最佳电解工艺条件：电解温度30℃；硫酸浓度140～180g／L；极间距5～6cm；氯离子添加量3．0mg／L；硫脲添加量0．5mg／L；骨胶添加量0．75mg／L；有害杂质允许含量(g／L)，As^3 ≤0．1,Sb^3 ≤0．05,Bi^3 ≤0．05。     

云母钛珠光颜料制备研究

设计将微乳体系既作为制备纳米粒子的反应介质 ,又作为云母的表面改性体系 ,进行了云母钛珠光颜料的制备研究。XRD和SEM分析结果表明 ,所制产品为 10～ 3 0nm的二氧化钛粒子呈球形均匀包覆于云母基质表面 ,EDS的测定结果表明 ,TiO2 的包覆率约为2 1 9%。     

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     

Annual Report analysis of Chinese rare earth-related listed companies in 2013

<正>Chinese rare earth-related listed companies have published their 2013 annual reports.It can be understood from their reports that production and operation activities of Chinese rare earth-related companies were still heavily affected by macro economy and industrial policies.They basically followed the steps of national economy.In 2013,world economy recovered slowly but the economy     

Market opportunities and challenges for rare earth polishing powder

正1.Status of rare earth polishing powder Rare earth polishing powder with high content of cerium oxide began to replace iron oxide for glass polishing and became one of the key materials in glass polishing process since 1940.Compared with traditional iron oxide,rare earth polishing powder has many advantages,such as fast polishing rate,high polishing quality and long service life.It can achieve good surface quality and improve operation conditions.For example,in lens polishing,the polishing work that cerium     

Baotou Research Institute of Rare Earths developed a new RE alloy preparation technology

正Pyrometallurgy Laboratory of Baotou Research Institute of Rare Earths had independently developed a new preparation technology of rare earth alloy for NdFeB.The alloy can remarkably enhance the coercivity of NdFeB magnet but also evidently reduce the production cost of the magnet.The new master alloy was prepared in the kA pilot-scale electrolytic cell by the independent technology.The rare earth master alloy can be used as the raw material for NdFeB.Compared     

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     

2014 second batch of rare earth quota released

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矿用防爆轴流对旋主要通风机叶片ANSYS模态分析及应用

高效节能矿用防爆对旋主要通风机的叶片是主要通风机运行的关键部件,叶片在运行时不断受到气流的作用力,从而使叶片产生振动,当叶片振动的频率与叶片的固有频率接近时,容易产生共振从而导致叶片的断裂。一旦叶片断裂时,对主要通风机的安全运行产生致命的影响,从而导致矿山、化工等企业发生重大事故,将会产生不可估量的损失。基于有限元分析软件ANSYS,对高效节能矿用防爆轴流对旋主要通风机叶片进行模态分析及产生对应的六阶模态频率,对主要通风机叶片的运行频率、固有频率及产生的共振问题进行了原理分析,并且解决了叶片频率共振的问题,从而为主要通风机叶片结构设计提供理论依据,并对主要通风机叶片的安全运行提供保障。     

2013 NdFeB export analysis

<正>China totally exported nearly 24,000 tonsof NdFeB products during 201 3,including 18,825 tons of permanent magnet,valued USD 1.34 billion at an average price of 71.4 USD/kg;3,277 tons of NdFeB magnetic powder,valued USD 1 01 million at an average price of 30.9 USD/kg;1,334 tons of strip casting ribbon,with total export value of USD 74million at an average price of 55.3 USD/kg;and 586