铀矿山通风防护工作的经济分析

本文介绍了评价铀矿工肺癌及辐射危害的社会经济负担方法。列举国内外铀矿山通风防护工作中应用经济分析方法所取得的进展,论述了防氡及氡子体的经济评价方法,推荐把氡子体局部或个体防护器具的研究作为近期重要发展方向之一。     

核工业铀矿冶职业辐射照射问题及其建议

核工业铀矿冶系统承担我国铀资源的开采和水冶，其工作人员受到氡子体的内照射和γ外照射辐射危害。根据2004年铀矿冶个人剂量监测结果，与核丁业总体剂量分布水平进行了比较；从我国铀资源分布、铀矿山辐射危害特点、采矿方法、矿山辐射防护投入和管理现状等方面，对铀矿冶职业辐射照射剂量较高的原因进行了分析探讨，提出了减少铀矿冶职业辐射危害的建议。     

我国铀矿冶测氡仪现状分析

介绍我国铀矿冶氡及氡子体监测历史和相关测量仪器现状,论述研制新型铀矿冶氡及氡子体测量仪器的紧迫性和必要性.     

我国铀矿冶设施辐射影响的降低与辐射防护最优化

回顾了我国核工业在过去30多年的发展过程中环境、健康影响的变化,分析了其中的重点环节－铀矿冶设施生产和防护技术的改进对降低辐射危害的作用,并以铀矿冶设施中铀矿井废水和铀尾矿库治理的防护水平和代价为列,讨论了铀矿冶设施防护的代价效能和防护水平。     

铀尾矿堆防氡覆盖分析

对铀尾矿堆的氡析出进行评价应采用全年全面积的平均氡析出率(?),即覆盖铀尾矿堆的防氡效率取决于该堆的性状、覆盖材料的性质和对空气渗流的控制程度。扩散系数小、孔隙度低、渗透性差的材料适于做覆盖材料。最后,文中给出了覆盖厚度的解析表达式。     

铀矿井氡的危害、析出规律及其控制方法研究

氡子体与矿工的肺癌有密切的关系,通过分析铀矿井氡的来源,氡析出规律和氡运移通道,提出了建立合理的通风方式,选择合理的采矿方法,隔离和密闭氡源,采用湿式作业,提高空气湿度等措施来降低和控制氡及其子体的析出。     

铀尾矿氡析出率的测量探讨

论述了在铀矿开采和水冶过程中,产生的大量废石和尾矿中含有铀、镭等放射性元素,并有高的氡析出率,需要进行治理以降低氡析出等带来的环境影响。探讨了铀尾矿氡析出率的测量方法、测量布点网度、测量时间及其影响因素。     

铀尾矿库覆盖层厚度的最优化分析

在铀尾矿库补救行动中,库面上覆盖上层是其中的一项关键措施。介绍了一种确定这种覆盖土层厚度的辐射防护最优化分析方法,分析方法结合了代价利益分析、多属性分析和模糊分析,在考虑了辐射危害和防护代价因素以外,还考虑了其它一些间接因素的影响。在给出方法的同时,还结合我国的一座大铀尾矿库进行了分析计算。分析给出了覆盖层厚度与根据有关退役标准中氡气析出率确定的厚度基本一致。     

铀尾矿库退役治理有关氡析出率问题的探讨

就铀矿冶设施退役环境治理过程中涉及铀尾矿库中的大面积铀尾矿氡析出率的测量、计算及用覆盖方法控制氡析出率的有关问题进行了探讨。提出了大面积铀尾矿年平均氡析出率测量中应考虑选择合适的测量时间、布点网度、测量次数等,以消除由于气象因素、尾矿中镭质量分数的不均匀等对氡析出率测量带来的影响。指出比较经济、衫的控制氡析出率的方法是用土壤、砂砾石等天然材料进行覆盖,并对确定覆盖厚度的方法进行了现场试验及理论计算的比较与说明。     

铀废石和尾矿中氡的治理进展

介绍了铀废石和尾矿中氡的污染现状,对国内外铀废石和尾矿中氡在环境中的治理的进展进行了总结和概括,并对未来的治理工作进行了展望。     

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。