石港矿15109综放工作面初采期瓦斯涌出特征分析

石港矿综放工作面瓦斯涌出量巨大,初采期的瓦斯超限问题威胁着该矿安全生产。通过对15109综放工作面初采期瓦斯涌出特征的分析,得出初采期瓦斯涌出波动性较大主要是上覆煤岩层的活动引起的,直接顶和老顶的垮落相继引起邻近层瓦斯的大量涌出,得出初采期风排瓦斯量、高抽巷抽放瓦斯量以及尾巷瓦斯浓度的变化规律,尾巷瓦斯超限距离为4.5～27.8 m,石港矿15109工作面初采期的瓦斯涌出特征适于该矿一采区的其他大采长工作面,并对上覆煤岩层相同的其他采区工作面的初采期瓦斯治理提供了重要参数。     

静态破碎剂力学性能研究及在端头悬顶中的应用

针对石港煤业公司15203综采工作面回采巷道端头后方顶板不易垮落的问题,采用静态破碎的方法来缩短悬顶距离,通过实验,确定了静态破碎的各项参数,在石港煤业公司15203综采工作面回采巷道端头顶板应用后,取得了良好效果。     

伪倾斜后高抽巷瓦斯抽放技术在石港矿的应用

为了解决石港煤矿综放工作面初采期瓦斯涌出不均匀,严重威胁矿井安全生产的问题,分析了综放工作面初采期瓦斯涌出特征,在15111综放工作面采用伪倾斜后高抽巷抽采初采期瓦斯技术,结果表明:初采期间,基本顶垮落之前,伪倾斜后高抽巷的瓦斯抽采量达到24.58～75.25m3/min,工作面初采期未出现瓦斯涌出峰值,有效地防止了工作面瓦斯超限事故。     

水采区复采长壁式工作面开采技术探讨

枣矿联创公司针对矿井煤炭资源接近枯竭的实际情况,进行了水采区长壁式工作面复采技术研究。该文重点介绍了水采区长壁式工作面复采技术及施工措施。通过实践,水采区长壁式工作面复采切实可行,取得了较好的经济效益,安全可靠,具有一定的推广应用价值。     

石港煤业15107进风巷加固技术应用研究

为解决石港煤业15107进风巷成巷后围岩失稳破坏严重的问题,通过实地勘察、矿压监测、理论分析等方法对巷道的变形情况、原因进行研究,发现巷道围岩变形破坏的主要原因为临近工作面采动的影响。设计对15107进风巷整体进行加固,工作面后方围岩逐渐趋于稳定,成功控制了15107进风巷的过度变形。     

复杂地质条件下薄煤层大俯角倾斜长壁工作面回采实践

根据郭矿公司21302工作面实际采矿条件,通过对大倾角长壁工作面俯采工艺特点的研究,进而采取相应的安全技术措施,成功解决了复杂地质条件下薄煤层倾斜长壁综采工作面大倾角俯采难题,为类似条件的煤层开采积累了经验。     

基于抽采半径考察的回采工作面瓦斯预抽钻孔优化设计

为了解决高瓦斯长推进距离回采工作面各区域瓦斯预抽时间极不均衡的问题,提出了基于抽采半径考察的回采工作面瓦斯预抽钻孔优化设计方案：采用瓦斯储量法对回采工作面瓦斯预抽钻孔有效抽采半径进行考察,得出工作面瓦斯预抽钻孔不同预抽时间的有效抽采半径,将高瓦斯长推进距离回采工作面按瓦斯预抽时间长短的不同划分为若干个区块,每个区块瓦斯预抽钻孔根据其有效抽采半径设计钻孔间距,预抽时间长的区块钻孔间距较大,预抽时间短的区块钻孔间距较小,实现工作面瓦斯抽采达标的同时最大限度的减少钻孔工程量。现场应用结果表明,2311回采工作面采用优化的瓦斯预抽钻孔设计方案,钻孔工程量减少约7万m,节约工作面瓦斯预抽时间约15d,并且在开采期间实现了瓦斯抽采达标和安全回采,高瓦斯长推进距离回采工作面采用基于抽采半径考察的回采工作面瓦斯预抽钻孔优化设计方案,取得了良好的技术经济效益。     

厚煤层综放工作面开采矿压显现规律

为了研究石港煤矿综放面采动引起的岩层移动规律,以石港煤矿15101综放工作面为例,采用矿用数字压力计分机、矿用压力数据采集器监测支架工作状况,推断厚煤层综放开采覆岩运动和压力显现特征,结果表明:15101综放工作面基本顶初次垮落步距平均为31.8 m时,呈上部大下部小的趋势,周期来压步距平均为8.0 m,动载系数平均为1.73,具有明显的规律,为顶板来压期间瓦斯治理提供重要的依据。     

高抽巷位置对瓦斯抽采效果的数值模拟研究

针对石港矿15#煤层瓦斯涌出特征,采用高抽巷抽采邻近层的高浓度瓦斯,但是随着工作面不断地向前推进,采动裂隙带的不断变化和破坏,使得顶板高抽巷发生变形破坏,从而直接影响了邻近层瓦斯的抽采效果,通过实测数据和数值模拟的研究分析,高抽巷合理的位置是制约邻近层瓦斯抽采的重要因素。     

高瓦斯工作面顶板定向钻孔瓦斯抽采技术研究

新景公司3105高瓦斯突出工作面创新性地试验了顶板穿层定向长钻孔工艺,对上覆邻近层1~#、2~#煤进行抽采治理。结合本工作面相关地质资料及工程概况,理论分析了定向长钻孔的合理布置参数;应用新方案后,平均抽采浓度达到了49%,平均抽采量达到了6.2 m~3/min,抽采效果良好。     

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。