铀矿山退役治理效益指标体系构建研究

铀矿山退役治理是一项庞大复杂的系统工程,铀矿山退役治理后的效益分析包括经济效益、社会效益和环境效益分析。建立了铀矿山退役治理效益指标体系,提出了铀矿山退役治理效益的数学模型。     

某铀矿山退役治理后的环境效益分析

铀矿山退役治理是一项庞大复杂的系统工程,铀矿山退役治理后的效益分析包括自然环境和生态环境效益分析。由于铀矿山区域环境特殊,退役治理的内容和标准有别与其它类别的矿山,所以选择的指标有一定的特殊性。本文采取层次分析法(AHP)确立各项指标的权重,以污染物的去除率作为治理的效益,各种污染物的去除率乘以其对应的权重作为总效益。以某铀矿山为例,通过分析认为此铀矿冶退役治理效益较好。     

退役铀矿山矿坑水治理方法的分析

归纳了我国退役铀矿山矿坑水治理的特点 ,对目前退役铀矿山矿坑水治理的方法进行了总结、分类 ,结合郴州铀矿退役矿坑水治理工程实例 ,提出了做好退役铀矿山矿坑水治理工作的建议。     

硬岩铀矿山退役治理项目前期工作若干问题的探讨

通过4个具体实例分析,总结和探讨了硬岩铀矿山退役治理项目前期技术工作中的历史资料收集与分析、治理工程相关岩土勘察、场址渗水以及总体方案设计等问题,提出了相应的对策和建议,为硬岩铀矿山退役治理项目前期工作提供参考。     

DNB和SRB治理地浸采铀矿山污染地下水的研究现状及展望

文章简述了地浸采铀工艺的特点,分析了地浸采铀矿山退役井场地下水的主要污染成分,强调了治理地浸采铀矿山退役井场污染地下水的必要性和紧迫性.在分别介绍DNB和SRB治理污染地下水中污染物的原理、影响因素等的基础上,综述了用DNB和SRB分别处理矿山废水的研究现状及进展.针对地浸采铀退役井场污染地下水成分特点,在国内首次提出了采用反硝化细菌(DNB)和硫酸盐还原菌(SRB)联合治理地浸采铀矿山退役井场污染地下水的可行性和必要性,并提出了相关建议和展望.     

湖南某退役铀矿山水环境重金属污染现状评价

在对湖南某退役铀矿山水环境重金属调查监测的基础上,应用内梅罗模型对水环境现状进行评价,从而为该铀矿退役治理效果评估提供参考依据,促进我国铀矿冶设施退役工作的发展。评价结果表明,就重金属污染而言,研究区水环境质量总体较好,但局部地段水环境质量较差;局部地段地表水中锰和镉含量严重超标是由开采软锰矿造成的,而与原铀矿山铀矿开采无关;沩水河水及地下水中锰含量普遍超标与本地区广泛产出软锰矿的地质背景条件有关;湖南某退役铀矿山退役治理效果较好。     

浅谈提前关停铀矿山的资源回收

阐述了对提前关停铀矿山退役治理前进行资源回收的必要性和可行性。尽量回收提前关停铀矿山的资源 ,不仅可以提高稀有铀资源的回收利用率 ,减少浪费 ,而且有利于退役治理后对退役工程的管理。从另一方面讲 ,随着铀矿采冶技术的成熟与改进 ,通过回收这部分资源进行铀产品生产 ,充分利用了原有生产设施与设备 ,环境影响小而又经济效益明显。     

铀矿采冶设施退役治理标准探讨

介绍了美国铀水冶尾矿健康和环境保护标准及铀、钍污染的可允许表面放射性污染水平和土地/土壤清洁水平等规范,德国退役铀水冶设施中固体物料处置标准,加拿大铀矿山/水冶厂可利用材料的去污限值标准等国际铀矿采冶设施退役治理标准以及俄罗斯铀废石场尾矿库退役治理的安全环保标准。分析了我国铀矿采冶设施退役治理标准现状,提出了我国铀矿采冶设施退役治理标准修订建议。     

国内外2个铀矿山退役治理效果的比较研究

以国内某铀矿山和德国Ronneburg铀矿山的退役治理为研究对象,对其在废石堆治理、矿井封闭和废水处理3个方面进行了退役治理方式和治理效果的比较分析。分析结果表明:在治理标准和治理方式上2个矿山基本一致,但德国Ronneburg铀矿山在源项调查、废水处理和长期监护方面比我国某铀矿山做得更为详尽,更好地确保治理工程的长期有效性。     

某铀矿废石场地下水截渗墙设计

针对硬岩铀矿山关停后,在铀矿山废石场进行最终退役治理之前,为防止废石场渗出水污染地下水;提出了截渗墙与集水井设计方案,并进行了实际工程建设。废石场渗出水经截渗墙拦截后,引入集水井,避免了无组织排放对水体的污染。     

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