钨—桑色素配合物的极谱波研究及应用

在ｐＨ２．１的硫酸－１．７８×１０＾－５ｍｏｌ／Ｌ桑色素－０．０２ｍｏｌ／Ｌ氯乙酸底液中，钨在－１．１３Ｖ（Ｓ．Ｃ．Ｅ）有一灵敏的极谱波。可用于微量钨的测定，线性范围为２．１８×１０＾－１０－－１＼５２＾１－＾－８ｍｏｌ／Ｌ，检出限为７．３６×１０＾－１１ｍｏｌ／Ｌ。方法准确性好，简便快速。直接应用于三氧化钼光谱标样中微量钨的测定，结果令人满意。     

硼的极谱波研究与应用

在乙酸－乙酸钠缓冲溶液（ｐＨ４．３）－１．３１×１０＾－４ｍｏｌ／Ｌ铍试剂Ⅲ－３．４２×１０＾－２ｍｏｌ／Ｌ ＥＤＴＡ底液中，硼在－０．４５Ｖ（ｖｓ．ＳＣＥ）处有一灵敏的极谱波，波高与硼的浓度在２．３１×１０＾－７￣４．６３×１０＾－５ｍｏｌ／Ｌ范围内呈线性关系。拟定的方法应用于地球化学标样中微量硼的测定，操作简便，结果准确。     

示波极谱法测定铅锌矿中的砷

在含有０．４２ｍｏｌ／Ｌ盐酸、５．８４＊１０＾－４ｍｏｌ／Ｌ钼酸铵、３．６０＊１０＾－４ｍｏｌ／Ｌ酒石酸锑钾、３．４５＊１０＾－３ｍｏｌ／Ｌ抗坏血酸和１０％丙酮的底液中加入Ａｓ（Ⅴ）,形成砷锑钼三元杂多酸,在单扫描示波极谱仪上产生一灵敏的络合吸附波,峰电位Ｅｐ＝－０．３７Ｖ（ｖｓＳＣＥ）,当Ａｓ（Ⅴ）浓度在５．３４＊１０＾＆－８－１．０７＊１０＾－５ｍｏｌ／Ｌ范围时,峰电流与Ａｓ（Ⅴ）浓度呈线性关系,检出限为２．１９＊１０＾－８ｍｏｌ／Ｌ。用于测定铅锌矿中的砷,不需分离,可直接测定,测定结果与标样值吻合,加料回收率为９３％－１１０％。     

硝酸“催化”分解黄铁矿的动力学研究

本在３３３－３６３Ｋ，硝酸根浓度０．１－０．５ｍｏｌ／Ｌ的条件下，实验研究了常氧压下硝酸“催化“分解黄铁矿的动力学，结果表明，黄铁矿分解后其中所含硫主要转化为硫酸根，浸出过程受化学反应控制，符合收缩未反应核模型，其表观活化能为３９．８７ｋＪ／ｍｏｌ。根据实验结果推导出浸出速率的数学模型为：１－（１－α）１／３＝６．３０×１０×２ＣＮＯ３＾０．８３·ＣＨ＾８．８３·γ０＾－１ｅｘｐ（－３９．８７×     

萃淋树脂分离－催化极谱洁测定核级UO_2及U_3O_8中的钒

经ＣＬ－５２０８萃淋树脂在３ｍｏｌ／ＬＨＮＯ３中分离铀后，在含乙酸－乙酸钠（ＰＨ５．２）缓冲液的０．０６％铜铁灵－０．００１％辛可宁－１％抗坏血酸的底液中，催化极谱法测钒。钒浓度在１～５０ｎｇ／ｍＬ与峰电流有良好线性关系。铀样品称取０．１ｇ时钒的测定下限为０．１μｇ／ｇ。相对标偏≤１１％。钒回收率为９３％～１０７％。     

化学发光法测定铅的研究及其应用

本文研究了痕量Ｐｂ（１１）对Ｈ２Ｏ２氧经鲁米诺－邻菲罗啉产生强的化学发光反应,以邻菲较啉为增强剂,Ｐｂ（１１）的检出限为２．８×１０＾－６ｍｇ／ｍＬ,工作曲线响应浓度范围在１×１０＾－５－１×１０＾３ｍｇ／ｍＬ测定５×１０＾－４ｍｇ／ｍＬＰｂ（１１）离子相对标准偏差为３．２％,化学发光法检测萤石中微量铅可获得满意结果。     

核级UO_2及U_3O_8中铌的萃淋树脂分离－催化极谱法测定

样品溶液经ＣＬ－５２０９萃淋树脂在２ｍｏｌ／Ｌ硝酸介质中分离铀后，用催化极谱法测定铌。铌在０．８％Ｈ２ＳＯ４－０．０５ｍｏｌ／Ｌ酒石酸－２％ＫＳＣＮ－０．０８％抗坏血酸－０．０００４％聚乙烯醇底液中，于－１．３Ｖ处呈现络合催化氢波（ｖｓ．ＳＣＥ）可用二次导数测定。铌峰电流与浓度（０．００５～０．０３μｇ／ｍＬ）有线性关系。称样０．１ｇ时，铌的测定下限为０．５μｇ／ｇＵ、６次测定相对标准偏差＜１５％，加入回收率为９１％～１１９％。     

钨－桑色素配合物的极谱波研究及应用

在ｐＨ２．１的硫酸－１．７８ｘ１０￣（－５）ｍｏｌ／Ｌ桑色素－０．０２ｍｏｌ／Ｌ氯乙酸底液中，钨在一１．１３Ｖ（Ｓ．Ｃ．Ｅ）有一灵敏的极谱波。可用于微量钨的测定，线性范围为２．１８ｘ１０￣（－１０）～１．５２ｘ１０￣（－８）ｍｏｌ／Ｌ，检出限为７．３６ｘ１０￣（－１１）ｍｏｌ／Ｌ。方法准确性好，简便快速。直接应用于三氧化钼光谱标样中微量钨的测定，结果令人满意。     

分光光度法测定粉煤灰中微量锌

利用Ｚｎ（Ⅱ）－ＳＣＮ＾－－ＲｈＢ－ＰＶＡ显色站（Ⅱ）的研究，建立了一种新的光度法测定量锌（Ⅱ）。结果表明，在盐酸介质中具有高灵敏度的显色反应，表观摩尔吸光系数为１．５８×１０＾６Ｌ／ｍｏｌ．ｃｍ，Ｚｎ（Ⅱ）量在０．０～０．０４０ｍｇ／Ｌ的内服从比耳定律。用于测定粉煤灰中微量锌，结果令人满意。     

酸性铬蓝K光度法测定煤矸石中微量钒

研究了酸笥铬蓝Ｋ（ＡＣＢＫ）与钒（Ｖ）的褪色反应,褪色程度与钒（Ｖ）量线性相关,借此建立测定微量钒的分光光度法。结果表明,有色溶液的最大吸收波和匠５２０ｎｍ,摩尔吸光系数为１．１×１０＾４Ｌ／ｍｏｌ．ｃｍ钒（Ｖ）量在０．０～３．２０ｍｇ／Ｌ范围内符合比耳定律,本法用于测定煤矸石中的微量钒时,获得了满意的结果。     

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     

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     

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     

唐口煤矿深部复杂开采工作面瓦斯分源涌出规律研究

研究工作面瓦斯涌出规律对工作面瓦斯治理有重要意义。为了得到唐口煤矿深部3号煤层复杂开采条件下工作面回采时期瓦斯涌出时空演化规律,选取6304工作面作为对象,采用实测方法研究6304工作面瓦斯涌出规律。结果表明:6304工作面瓦斯涌出量为6.534 m³/min,其中煤壁占34.27%,落煤占29.62%,采空区占36.11%;沿工作面倾向由低到高,瓦斯浓度整体为上升趋势,其中1—76号架工作面瓦斯浓度小于0.20%,76—102号架瓦斯浓度上升明显,最大为0.387%;上隅角的后部采空区是工作面的瓦斯主要涌出源,上隅角1号测点瓦斯浓度0.78%,上隅角周边3号、5号、7号、8号、9号测点瓦斯浓度平均为0.643%;周期来压时,上隅角瓦斯相对平时较高。研究为针对性的瓦斯分源监控与灾害防治提供基础。