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。     

石背山铅锌铁矿水文地质条件初探

根据矿区的水文地质条件及矿床充水因素,预测了矿坑涌水量,指出供水水源方向及矿体围岩局部存在的层间破碎带和少量溶蚀裂隙带。建议矿山开采时应注意岩溶裂隙水和老窿积水的影响,及时对原采坑进行回填封闭并进行老窿水治理,谨防矿坑坍塌和矿坑突水事故的发生。     

湘潭锰矿矿床开采与酸性水治理

湘潭锰矿属浅海相沉积型碳酸锰矿床,部分露头为氧化锰。矿体赋存于含黄铁矿的黑色页岩之中。黑色页岩的厚度为矿体厚度的10～15倍,并具有氧化自燃性。随着矿床的开采(1958年前为露天开采,后转入地下开采),黑色页岩的大量剥离,露天堆放及陷落松动等因素,一是自燃,二是产生大量矿坑酸性水。矿坑酸性水对矿山,对农业危害极大。二十余年来,我矿对酸性水进行了大量的治理工作,采取了以改革采矿方法为主的综合防治措施,使矿坑酸性水得到基本治理。     

QYW铀矿山地质环境问题及原因探析

闭坑的QYW铀矿山主要地质环境问题为土壤和水环境污染,土壤污染以镉和铀为主,水污染主要有镉、铀和锌。矿坑水和废石堆淋滤水为酸性矿坑水,是水污染源;黑色岩系是土壤的原始污染源,叠加的二次污染是矿山土壤污染的又一途径,矿业活动加剧了污染范围和程度。该类矿山地质环境脆弱,合理规划矿产资源的开发利用和加强矿山地质环境保护与治理恢复工作十分重要。     

矿坑涌水封堵治理过程中岩溶导水通道连通性研究

受含水层岩溶发育不均匀性影响,大水矿山矿坑涌水导水通道空间分布位置的探查存在较大技术难度,难以针对性制定矿山防治水方案。以强岩溶地区某大水矿山矿坑涌水治理工程为背景,选择食盐作为示踪剂,通过连通试验研究了注浆孔揭露岩溶通道与矿坑主要涌水点之间的水力联系,并在标定水样电导率-食盐浓度对应关系的基础上,计算了岩溶通道补给水源汇入涌水点的比例。试验结果表明,该岩溶通道与矿坑-30m水平最大涌水点连通性好,示踪剂回收率达到88.45%以上,可判断其为主补给通道。此通道经“投料+注浆”封堵治理后,涌水点水量由2.4万m3/d降至500m3/d,保障了安全生产。研究结果表明:连通试验在岩溶管道流充水矿山导水通道探查方面具有良好的适用性,是查明导水通道与矿坑涌水点连通性和补给量的可靠技术手段,能够为大水矿山制定防治水策略提供有效技术依据,避免因条件不清而造成的盲目施工,具有显著的经济效益和社会效益。     

淄川区矿坑水资源利用评价与分析

通过评价淄川区矿坑水水量和水质现状与分析矿坑水对环境造成的影响,提出了矿坑水综合利用的途径。     

霍邱李楼铁矿水文地质特征及防治水措施

李楼铁矿是目前国内地下铁矿山中规模最大,水文地质条件较复杂的铁矿山。通过水文地质条件研究,认为基岩裂隙水是矿床的主要充水水源,节理裂隙是矿坑充水的主要通道,矿坑水很难预先疏干。采用比拟法预测了矿坑涌水量,结果表明矿坑深部的正常涌水量为10 062m~3/d,并提出了矿坑防治水技术措施。     

某大水矿山地下水资源综合利用与回灌技术

某大水矿山在合理开采矿产资源条件下,采用"堵+回灌"相结合的手段,对矿区内地下水资源进行治理与保护。根据该矿山水文地质条件,采用全封闭帷幕注浆手段对矿区内的地下水资源进行治理,限制地下水降落漏斗的扩展范围,降低矿坑涌水量。为进一步加大地下水资源和水环境的保护力度,采用矿坑水回灌技术,从而实现了矿山地下水零排放的目标,有效保护了区域地下水资源。     

酸性矿坑水的治理

一、酸性矿坑水的危害我国硫铁矿、煤矿和多金属硫化矿存在酸性矿坑水,在开拓的矿山中占有相当的数量。这些矿山由于矿石中含有一定数量的硫化物,经氧化后往往形成酸性矿坑水。这种水在井下腐蚀管道和设备,危害工人身体健康;排出井巷,污染环境和水源,严重地影响着工农业和渔业生产,给矿山带来的经     

鞍山大孤山矿区地下水氢氧同位素特征及水源识别

准确识别露天开采矿区漏水来源对矿山的安全开采具有重要意义。基于鞍山大孤山矿区地下水和矿区漏水水样的氢氧同位素测试结果,研究了矿区地下水的氢氧同位素特征,分析了矿区不同含水层之间的补给关系和水力联系,最后结合矿区地质条件确定了矿区不同位置漏水成因。结果表明:地下水来源于大气降雨,含水层之间水力联系紧密;巷道入口漏水来自地表池塘水,巷道其余漏水和矿坑西侧边坡漏水来自矿区西侧地下水的侧向补给;矿坑南侧边坡2处漏水相互补给,漏水水源来自于矿坑南侧地下水。研究结果对矿区水害治理提供了指导意义。     

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