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％。     

二氧化铀中微量铍和钍的测定

在三乙醇胺体系中，利用桑色素荧光光度法测定微量铍，当激发波长为４００ｕｍ时，铍－桑色素络合物的最大荧光波长为５２５ｕｍ，铍的标准曲线范围为０．０５～１．０μｇ／１０ｍＬ。在盐酸介质中，利用偶氮胂－ＴＢＣ分光光度法测定微量钍，钍的测定波长为６３５ｕｍ，标准曲线的范围为０．２～５．０μｇ／２５ｍＬ。利用ＣＬ－５２０９萃淋树脂进行了大量铀中微量铍和钍的分离。在１ｍｏｌ／ＬＨＮＯ３中，由于铀和钍的吸附，微量铍被定量分离，在１ｍｏｌ／ＬＨＣｌ＋１ｍｏｌ／ＬＮａＣｌ介质中，微量钍可被定量淋洗。二氧化铀样品中铍和钍测定结果的相对标偏优于５％。     

催化极谱法测定痕量钒

在０．００１％铍试剂Ⅱ－１．２％溴酸钾－０．４％氟化铵－１．２×１０＾－２ｍｏｌ／Ｌ醋酸－醋酸钠介质中，钒在峰电位为－０．６５Ｖ产生一个良好的导数极谱波，当钒浓度在７．８×１０＾－８－３．１×１０＾－６ｍｏｌ／Ｌ范围，峰电流与浓度成正比，大量铁及其他杂质不干扰，可直接测定低合金钢中痕量钒，方法简单，快速，准确。     

萃淋树脂分离—催化极谱法测定核级UO2及U3O8中的钛

样品溶液经ＣＬ－５２０９＃淋树脂在２ｍｏｌ／Ｌ硝酸介质中分离铀后，用催化极谱法测钛。在含乙酸一乙酸铰缓冲液（ｐＨ５．５）的０．４％ＥＤＴＡ－０．００２％铜铁试剂一０．００５ｍｏｌ／Ｌ溴酸钠底液中，于一０．６５Ｖ（ｖｓ．ＳＣＥ）有一钛催化波，进行二次导数测定。钛峰高与浓度在０．００５－０．０５μｇ／ｍＬ有线性关系。称样０．１ｇ钛的测定下限为０．５μｇ／ｇ。相对标准偏差优于６％，加入回收率为９４％一１０６％。     

ICP－AES法测定八氧化三铀系列标准物质中11种杂质元素

本法采用ＴＢＰ萃取树脂，利用革取色谱分离技术，使铀与待测杂质元素在３ｍｏｌ／ＬＨＮＯ３介质中得到定量分离。用９７５型ＩＣＰ直读光谱仪同时测定八氧化三铀系列标准物质中Ｃａ、Ｃｄ、Ｃｒ、Ｃｕ、Ｆｅ、Ｍｇ、Ｍｎ、Ｍｏ、Ｎｉ、Ｐｈ和Ｓｎ１１种杂质。测定下限为０．０２—１．６μｇ·ｇ－１，相对标准偏差＜１０％。分析结果均落在标准值的置信区间内     

硫酸多分步淋洗技术回收铀的研究

以硫酸（０．８～１．０ ｍ ｏｌ／Ｌ）硫酸铵（１．０～１．５ ｍ ｏｌ／Ｌ）为淋洗剂，采用多分步淋洗技术，在普通的固定床淋洗柱（Φ８．０ ｍ ｍ ）中对不同铀容量的２０１×７ 树脂（４３～１１８ ｍ ｇ／ｇ）进行试验。结果表明，淋洗体积仅１．５～２．５ ＢＶ①，合格淋洗液铀质量浓度达１５～２９ ｇ／Ｌ，总淋洗体积为１６～２１ ＢＶ，淋洗时间小于３５ ｈ。该淋洗合格液可先用干的粉状碳酸钙中和沉淀法去除硫酸，然后滤液用氨水沉淀铀，即两步沉淀法。所获ＡＤＵ 产品为一级品     

处理煤系硫铁矿的新途径

阐述了用γ－Ｆｅ２Ｏ３．Ｈ２Ｏ及ＦｅＯ（ＯＨ）处理煤系硫铁矿的方法及最佳条件，试验表明明在γ－Ｆｅ２Ｏ３．Ｈ２Ｏ的量为６０ｇ／Ｌ，溶液酸度在ｐＨ０．５～１．０范围内，通过０．３Ｌ／ｍｉｎ的空气并加热至沸的情况下，对１０ｇ／Ｌ硫铁矿反应１６ｈ，硫铁矿硫脱除率可达９０％以上，比单纯用ＦｅＣｌ３氧化硫铁矿快３ｈ以上。     

用三辛胺浸渍的聚氨酯泡沫塑料从水溶液中回收铀

《Ａｎａｌｙｓｔ》１９９８年第１２３卷第１期刊登了ＹａｓｅｍｉｎＴ．等人用三辛胺（ＴＯＡ）浸渍的聚氨酯泡沫塑料从水溶液中回收铀的文章。作者对萃取条件和解脱进行了详细研究。最佳萃取条件为：水溶液中铀浓度为２５×１０－６；萃取溶液酸度为ｐＨ＝２；萃取溶液体积与ＴＯＡ浸渍的聚氨酯泡沫塑料的质量比为５００（ｍＬ／ｇ）；ＴＯＡ－环己烷溶液中ＴＯＡ浓度为１０％（Ｖ／Ｖ）；萃取时间为１ｈ；萃取温度为２３℃。在上述最佳条件下，铀的回收率为９０．０±３．０％。用（ＮＨ４）２ＳＯ４、Ｎａ２ＣＯ３、ＮＨ４Ｃｌ－ＨＣＩ…     

催化极谱法同时测定核纯八氧化三铀中痕量铅和镉

在１ｍｏｌ／Ｌ硝酸介质中，铀被ＣＬ—５２０９萃淋树脂定量吸附，并与铅、镉等元素分离。收集流出液，加热蒸干后，在酸性（ｐＨ＝２）底液中，铅和镉与碘离子生成络合物吸附于滴汞上，可进行阴极化二次导数极谱法测定。铅、镉的峰电位分别为－０．６２Ｖ、－０．８０Ｖ（相对饱和甘汞电极）。铅、镉浓度在０．０１—１．０μｇ／ｍＬ是线性关系，对于痕量镉（小于０．１ｐｐｍ）的测定可在测定铅的波高之后，再加入一滴四丁基碘化铵乙醇溶液，镉的波高增加３倍，并有线性关系。方法精密度≤±１０％，回收率为９０％－１１０％。     

核电级铀氧化物中镉的萃淋树脂分离吸附极谱法测定

采用ＣＬ—５２０８萃淋树脂分离铀后，用二次导数极谱法测定铀氧化物中的镉．方法的相对标准偏差优于１０％，回收率９５％－１１１％。称样０．２００ｇ时，测定下限可达０．０５μｇ／ｇ。     

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。