浅谈我国薄煤层采煤机械化的发展方向

<正>目前,我国统配煤矿薄煤层约占全部可采储量的21％左右。据86个矿务局统计,其中有80个局、455处矿井赋存有薄煤层。我国薄煤层分布普遍,储量也相当丰富。例如,山东省占52％,四川省占60％,辽宁省占14％,鸡西局占75.5％,双鸭山局占68.1％,七台河局占85.5％。但从薄煤层的储量与产量的比值关系来看,薄煤层开采比例失调现象日趋严重。1981年薄煤层产量占全国煤炭产量的11.3％,到1988年降为10.4％。由此看出,大量薄煤层可采储量的开采受到了抑制。造成这一后果的主要原因是我国薄煤层开采机械化程度太低。     

引进刨煤机的现状

引进刨煤机的现状煤炭科研总院上海分院符国权我国缓倾斜煤层中薄煤层的可采储量，据统计约占２０％左右。薄煤层储量丰富，但至今开采量远低于储量，薄煤层资源浪费严重。历年来为了提高薄煤层的开采比重，引进和自行研制的刨煤机已有十几种，虽然在不同程度上取得了一定...     

国产薄煤层综采设备开采技术浅议

1 前言 煤炭工业技术政策规定:厚度在0.8～1.3m的煤炭称为薄煤层,0.8m以下的煤层称为极薄煤层.我国薄煤层资源丰富,分布广泛.根据原煤炭工业部"九·五"末统计的数据,全国薄煤层和极薄煤层可采储量分别占全部煤炭可采储量的16.9%和2.8%.由于薄煤层开采单产低、生产成本高、经济效益差,缺乏适应性好、生产效率高的开采装备,致使很多煤炭企业放弃薄煤层开采,造成煤炭资源的严重浪费.     

薄煤层液压支架立柱的研制与应用

<正>根据我国煤层厚度划分原则,厚度为0.8～1.3 m的煤层属于薄煤层。我国煤炭储量大且赋存多样化,薄煤层的可采储量约为60多亿t,约占全国煤炭总储量的18%,而薄煤层工作面每年产量约占煤炭总产量的7.32%,远远低于储量所占的比例。由于薄煤层开采空间小,工作条件差,综合机械化水平低,开采比较困难。近年来,随着综采技术在薄煤层中的成功应用,以及中、厚煤层储量的日益减少,薄煤层的开采越来越受到重视。     

薄煤层开采发展趋势及自动化开采实践

<正>薄煤层一直是煤炭开采中存在的一个难题,本论文通过对国内外薄煤层开采现状和薄煤层开采装备的研究情况进行分析,提出了薄煤层开采中存在的主要问题及发展趋势,指出了自动化、智能化开采和矮顺槽掘进是薄煤层开采发展趋势,并在唐山沟煤矿、南梁煤矿和甘庄煤矿分别进行了滚筒采煤机、刨煤机自动化开采和矮顺槽掘进进行了实践和总结。我国煤层赋存条件复杂,薄煤层分布广泛,其可采储量达61.5亿t,约占煤炭总可采储量的20%,     

积极发展薄煤层采煤机械化

<正> 一、发展薄煤层采煤机械化的迫切性据统计,全国统配煤矿现有矿井薄煤层可采储量占全部煤层的可采储量的20.85％,1980年薄煤层回采产量仅占总回采产量的12.6％,如按正常开采比例,全国统配煤矿每年少采薄煤层两千万吨左右,累计计算数字是很惊人的。     

我矿较薄煤层综合机械化开采

我矿较薄煤层综合机械化开采开滦钱家营矿梁铁和１前言我矿共有可采煤层四个，其中５煤层、９煤层均属于较薄煤层，占全矿可采储量的３６．２％。５煤层是４个可采煤层中最上一层，煤层厚度在０．７５～２．５ｍ，平均厚１．４７ｍ，是灰分为７．７２％左右、含硫量０．５...     

非机载变频系统在复杂难采煤层的应用

<正>我国薄及较薄煤层分布广泛,可采储量约占煤炭总可采储量的19%,急倾斜煤层约占探明储量的20%。这两类煤层是国际采矿界公认的复杂难采煤层,其安全高效开采是涉及国家能源可持续发展的重大战略问题。随着我国倡导建设节约型社会、走可持续发展道路的发展模式,复杂难采煤层的机械化开采逐渐受到重视。     

大倾角薄煤层开采模拟实验研究

在我国,薄煤层储量占煤炭总储量的20%左右,随着煤炭可采储量的日益枯竭,薄煤层开采已经成为许多矿井煤炭开采中不可避免的问题.为了使薄煤层能得到充分合理的开发和利用,提高煤炭回收率,国内外进行了大量的理论和实验研究.本文针对大安山煤矿中区地质条件与煤的赋存状况,应用相似模拟理论和相似材料模拟实验方法,结合煤岩物理力学实验,通过观测煤岩失效过程,研究大倾角薄煤层回采时顶板冒落状况和矿压显现规律.实验结果以同状况对比的方式在安全性和经济性方面揭示了对大倾角薄煤层进行单一煤层开采的优点,对相关问题的理论研究和生产实践具有指导意义.     

厚煤层顶极顶煤运移规律监测技术

我国厚煤层可采储量约占全国可采储量的43％,其中每年全国煤炭产量的40％～50％来自地下开采的厚煤层煤炭产量.对厚煤层实行高效、安全、高回收率开采对我国煤炭行业的可持续发展和国家资源有效开发具有非常重要的影响.     

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。