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针对矿山地质环境问题,利用遥感技术和实地调查对鄂尔多斯某煤矿进行矿山地质环境监测,根据监测结果,并听相关专家建议,建立了一套适合该煤矿的矿山地质环境综合评价体系,利用层次分析法(AHP)和熵权法相结合的“乘法集成法”确定各项评价指标主客观内在统一的综合权重,并采用模糊综合评价法对该煤矿进行综合评价,确保矿山地质环境综合评价结果科学、合理、可信。结果表明,该煤矿的矿山地质环境综合评价结果为0.466 5,属于Ⅱ级(较好),该研究结果可为该煤矿后续规划和开采提供理论依据,为建设安全、绿色、和谐的矿山地质环境奠定了基础。 相似文献
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矿山环境质量准确评价是矿山持续开发的前提条件,提出结合熵值法和突变理论进行矿山环境质量评价。选取矿山建设情况、自然生态环境、地质环境和社会经济环境4大类指标共11项因子,采用客观的熵值法判断指标间相对重要程度,利用突变级数法计算突变级数值进行评价,避免了确定指标权重值的弊端。以5个小型矿山环境质量评价实例进行验证,结果表明:数据获取、标准化和评价过程简便,矿山环境质量等级以较好和一般为主的评价结果符合实际情况,该方法经过完善指标体系后可更加合理地应用于实际工作中。因此,基于熵值法和突变理论的矿山环境质量评价方法是可行、可靠的。 相似文献
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以广东省为例开展矿山地质环境综合评价,利用矿山地质环境评价指标体系,开展矿山地质环境综合评价。针对广东省矿山地质环境问题,提出矿山恢复治理建议和矿山环境管护对策建议,为综合整治矿区环境提供基础数据与决策依据。 相似文献
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以实现评价矿山地质环境为目的,提出开采区矿山地质环境综合分级定量评价方法。以非金属矿山为研究对象,针对其周边地质环境和生态环境,建立开采区矿山地质环境综合分级定量评价指标体系。采用模糊层次分析算法,对该指标体系内的一级指标和二级指标实施相对重要程度赋值计算后,通过GIS空间分析算法,分析开采区矿山地质环境综合等级赋值频率分布情况,确定矿山地质环境评价的分区阈值,得到开采区矿山地质环境综合分级定量分区结果。实验结果表明,该方法可有效评价非金属开采矿区地裂缝、含水层破坏、地形地貌景观破坏等二级指标等级,可依据二级指标评价结果评价其一级指标等级,具备较好的应用性。 相似文献
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金属矿山环境地质条件模糊综合评判 总被引:5,自引:0,他引:5
矿山地质条件是制约金属矿山环境问题的重要因素,预防和治理矿山环境问题需要有效评价矿山环境地质条件.应用模糊综合评判方法,建立金属矿山环境地质条件评价模型.以四川木落稀土矿为例,选取地形地貌、地质构造、岩土性质与结构、水文地质为评价指标,构造评价因素集,并以研究区地质特征和专家调查结果为基础,构造评价矩阵,并确定个因素的权重.最后,综合评价研究区矿山环境地质条件较好. 相似文献
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<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 相似文献
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《中国稀土信息(英文版)》2014,(6)
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 相似文献
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YANG Li 《中国稀土信息(英文版)》2014,(6)
<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 相似文献
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Gao Wei 《中国稀土信息(英文版)》2014,(11)
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 相似文献
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《中国稀土信息(英文版)》2014,(8)
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 相似文献
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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。 相似文献
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Chen Zhanheng 《中国稀土信息(英文版)》2014,(5)
<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 相似文献
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Bai Wenping 《中国稀土信息(英文版)》2014,(12)
<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 相似文献
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《中国稀土信息(英文版)》2014,(9)
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 相似文献
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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。 相似文献