煤矿开采对水资源及生态环境的影响分析

本文以贵州省黔西县青龙煤矿为研究对象,在分析矿区水文地质条件的基础上,通过区内水文地质钻孔抽水资料,对该地区煤矿开采造成的地下水含水层的破坏情况进行了分析,并根据前后水质化验数据,对区内水资源水质进行了评价,同时对区内可能造成的生态影响进行了简要分析。结果表明,煤矿开采对地下水含水层、水资源及生态环境成了严重影响,煤矿开采要应积极运用新型高效合理的开采技术,同时加强对区内水资源及环境的监测。     

滕县煤田滕北矿区水化学特征研究

通过对滕北矿区各勘探阶段水质资料的收集、分析和研究及采样进行同位素测试，揭示了区内各主要含水层水化学特征、水质变化规律，为分析矿区地下水的补给、迳流、排泄条件，指导滕北矿区各矿井防治水工作提供了科学依据。     

煤矿开采对阜新地下水环境影响的研究

针对阜新地区煤矿开采引起的水环境问题,探讨了煤矿开采对阜新地区地下水水位及流场的影响,分析了煤矿工业排放的废水、废渣对矿区地下水水质影响以及矿区内废弃采空区对地下水环境可能造成的影响;提出了保护矿区水环境、防止矿区水环境恶化的若干建议。     

鞍山某大型铁矿露天开采对含水层影响的研究

以鞍山地区某大型铁矿山为研究对象,分析了露天开采对矿山水文地质条件的总体影响。重点从含水层结构破坏、地下水疏干和补径流排泄条件三个方面结合现状和预测两个角度进行研究,得出了鞍山地区铁矿露天开采会导致开采范围内含水层结构的彻底破坏,原有含水层被阻断,地下水系统在矿坑周边形成了新的流场和补给径流排泄等循环体系的结论。     

山东省浅层地下水超采区规划研究

对山东省浅层地下水区域进行了研究,通过地下水动态分析法,得到了全省浅层地下水超采区划定区域范围,该划定区域范围可对已遭受破坏的地下水含水层有针对性地采取恢复和保护,使其发挥应有的作用,实现地下水的可持续利用。     

露天煤矿地下水环境影响分析及质量评价

以潞安新疆煤化工(集团)有限公司露天煤矿地下水环境为研究背景,明确了矿区的地下含水层、隔水层及补给情况,采用库萨金法计算地下水影响半径,详细分析了露天煤矿开采对矿区地下水水量及水质的影响状况,通过布置监测点收集矿区地下水监测数据,并采用单因子污染指数法对监测结果进行有效评价。     

环境同位素技术在判定矿井含水层间水力联系的应用

基于环境同位素技术在水文地质研究中的广泛应用,运用其原理可以标识地下水分布、运移和补给规律,特别是在分析矿区地下水补给来源、各含水层之间的联系、地下水年龄及地下水混合比例等方面起了重要作用。运用环境同位素技术并结合水化学特征研究了巴彦高勒矿井各含水层之间的水力联系。试验结果表明,应用此项技术能准确、快速地确定矿区地下水的同位素特征,并判断出矿井突水的主要来源,可为制订有效的防治水措施提供科学依据。     

黄河中游榆神府矿区采动含水层失水模式及保护技术

“煤-水”矛盾已成为制约榆神府矿区煤炭安全高效绿色开采的主要因素。为缓解区内煤炭开采与水资源保护之间矛盾,切实保护水资源和生态环境,以榆神府矿区内典型煤矿为例,研究揭示了煤水赋存特点,构建了采动含水层失水模式,初步探讨了水资源保护整体思路和技术。研究成果表明:榆神府矿区内存在地表水和地下水2大类水资源。地表水以海子、地表径流以及泉的形式赋存,地下水则有萨拉乌苏组潜水、烧变岩水和风化基岩水3种重要类型。按照含水层与导水裂隙带的位置关系,将其分为低位含水层和高位含水层2类。低位含水层失水模式为导通漏失型,高位含水层存在非导通垂向渗失和渗流溢出蒸发散失型2种失水模式,前者发生于高位承压含水层中,后者则主要是高位潜水含水层的失水模式。低位含水层可通过导水裂隙带发育高度控制技术、采后顶板注浆加固技术实现水资源保护,高位含水层可通过人工隔水层再造、离层注浆以及协调开采技术实现水资源保护。对于无法实施原位保护流入采空区的水则可通过地下水库存储、净化循环利用和深部回灌等矿井水综合利用技术处理间接实现水资源保护。     

朔里煤矿环境地质现状评价

根据矿井所处的地理位置,调查分析了朔里煤矿开采后对土地资源的现状破坏情况,属较严重;测试分析矿区地表水、浅层地下水、深层地下水水样,矿山开采对含水层结构破坏严重,对地下水水位影响程度为小～大;调查矿山开采对人居环境影响较小;分析了矿井开采后引起的地质灾害主要为采空塌陷,其危害程度为较轻～严重,危险性程度为小～大。通过对其综合分析,评价该矿井环境地质现状为不良。     

神东矿区煤炭开采对含水层破坏模式研究

为了能够更快速、更有效地制定和实施煤炭开采区的含水层保护方案,在充分了解神东矿区区域含水层结构特点及与煤层的空间分布关系的基础上,总结提出了6种煤层与含水层空间关系组合模式,并对含水层破坏的模式进行归纳。结果表明:采煤引起的含水层破坏主要为顶板含水层剥离和导水裂隙带发育至含水层2种类型,可以归纳为破坏顶板中-强富水性孔隙含水层模式、破坏顶板中-强富水性砂岩孔隙裂隙含水层模式、破坏顶板风化裂隙含水层模式、破坏顶板向斜型蓄水构造模式、破坏烧变岩含水层模式等5种模式。通过空间关系组合模式可以对应破坏模式,从而可以更快速地判断水文地质条件,掌握含水层破坏特征,有利于矿区水资源保护和煤矿安全生产。     

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