永陇矿区东段延安组煤层赋存规律

黄陇侏罗纪煤田永陇矿区东段延安组含煤5层,3煤为主采煤层,厚度0.35～34.20 m,平均16.89 m,含煤面积33 km2,可采面积30 km2,;2-3煤为局部可采煤层,厚度0.40～12.31 m,平均3.47 m,可采面积5 km2.论述了煤层发育特征、分布规律、聚煤规律及控制因素.     

山西沁水煤田龙湾井田煤层地质特征及煤层气概要评价

龙湾井田位于晋获褶断带的西侧,沁水块坳的南端,析城山坳缘翘起带的北侧。含煤地层为二叠系下统山西组和石炭系上统太原组,含煤地层平均总厚度为131.86m,共含煤12～15层,煤层平均总厚度为8.74m,含煤系数为6.63%,含可采煤层2层,平均总厚度为4.65m,可采含煤系数为3.53%。根据区内钻孔资料,对区内含煤地层、可采煤层的赋存位置、特征及煤质、煤层气含量特征进行分析评价,总结了区内煤层的特征、分类及煤层气含量的分布特征。     

河南西部某煤田地质特征研究

在当前形势下,实现煤炭资源的保障,要立足国内供给,加大煤矿资源潜力评价和地质勘查,挖掘自身潜力,利用自身优势,寻找新的后续矿源。以某煤炭区域地质情况为背景,研究了煤田沉积环境特征、测井响应特征、煤层分布特征、煤层物理性质、煤岩特征以及煤类。研究得出,某煤炭区可采煤层为赋存在山西组下部的二₁煤层,煤层厚度0.15～10.57 m,平均厚4.11 m,属大部分可采的中厚煤层、结构简单,二₁煤层为中灰、中硫、高热值贫煤和无烟煤,区内二₁煤层的稳定程度属较稳定煤层。研究对该地区煤炭工业发展具有一定的指导意义。     

高档普采工作面通过斜交断层新方法

协庄井田处在新汶煤田西部 ,位于新汶向斜南翼。煤系地层属石炭二叠系 ,呈走向近东西、倾向北的单斜构造 ,煤岩层倾角 5°～ 36° ,呈东缓西急之势。井田内可采煤层共 6层 ,前组煤为二层、四层和六层煤 ,后组煤为十一层、十三层和十五层煤 ,累计厚平均 8.96m。二层煤平均厚度为 2 .4 3m ,四层煤为 2 .6 7m ,二、四层煤为矿井主采煤层 ,六层煤平均厚度为0 .8m ,十一层煤为 1.5m ,十三层煤为 0 .87m ,十五层煤为 0 .72m。煤质为气煤或气肥煤。协庄煤矿 195 8年建矿 ,1996年改扩建后 ,设计生产能力达到 1.8Mt a。矿井地面标高为 +16 0～ +2 0 …     

合水东部勘查区含煤地层及煤质特征

合水东部勘查区位于陇东煤田,含煤地层为中侏罗统延安组,共发育5层煤,其中3层可采。根据岩性特征延安组可分为三段,可采煤层主要分布在第二段,煤层厚度变化小。可采煤层煤质特征为低灰、中-低硫、中高挥发分、高发热量弱粘煤,可作动力用煤和民用煤。     

浅析老龙湾井田含煤地层特征

沁水煤田位于山西省南部,是山西省最大的煤田,老龙湾井田位于该煤田的西南部边缘。井田内主要含煤地层为上古生界二叠系山西组及石炭系太原组,山西组为一套陆相含煤地层,其中下部发育该区主要的可采煤层3号煤层。太原组为一套海陆交互相含煤地层,其中下部发育本区内的另一主要可采煤层15号煤。在前人研究的基础上,结合"山西省沁水煤田老龙湾井田煤炭勘探项目"的勘查成果,利用沉积学、煤田地质学、岩相古地理等理论及方法,总结其含煤地质特征及控煤因素,重点剖析了井田内含煤地层的时间演化和空间分布规律及主要可采煤层厚度变化规律,研究了该区聚煤古地理环境及其对煤层厚度的控制,对山西组3号煤层厚度的变化规律及形成原因进行客观的分析,对该区煤层勘探开发具有一定的指导意义。     

黄泥灌浆

窑街煤田为祁连山东南段的山间盆地,煤田为一小型复背斜构造,煤系地层为中下侏罗纪。煤层倾角在浅部一般为9～15度,深部倾角大,一般在42度左右,最大60～90度,东北部有倒转现象。煤田内可采煤层有三层,自上而下为煤一层,厚度0.19～4.51米,平均2米,顶板为铝质泥岩,底板为油页岩,距煤二层9.10～12.40米;煤二层厚度0.30～98.17米,平均     

曹庄井田构造形成机理及应用

1矿井简介 曹庄井田位于滕南煤田北部,井田西起田岗断层,东至高庙多断层,南与柴里井田相邻,北与泉上井田相邻.井田南北长2.1～2.9km,东西宽2.3～3.6km,面积7.3km2.主要含煤层为下二迭统山西组和上石炭统太原组,共含煤18层,可采与局部可采煤层有3下、12下、16、17煤四层,平均厚度12.95m,其中3下为主采煤层.     

峰峰煤田2号煤层分叉成因及可采煤层分布规律的探讨

煤层分叉一般是煤田边沿成煤物质终止堆积形成的。峰峰煤田2号煤分叉则不同。它是一个煤层分为两个煤层,然后又合二为一。两煤层的层间距,最小9.2m,最大达33m。分叉后上层煤稳定,下层煤厚度为0.05m～2.5m。可采范围往往形成孤立的小块。研究该煤层分叉的成因,对掌握可采煤层的分布规律和开采具有一定的意义。     

极薄煤层回采技术的研究

1极薄煤层开采技术条件 1.1地质条件 留庄煤矿位于滕北煤田南部,井田处于张坡断层和马楼断层之间,主采煤层系石炭二叠系含煤地层12下、14和16煤,其中12下煤层厚度为0.9～2.15m,平均厚度为1.3m,全区范围内可采,14煤厚度为0～0.95m,平均厚度为0.6m,部分范围内可采,16煤厚度为1.1～1.8m平均厚度为1.25m,全区绝大多数范围内可采.受两条主要断层影响各煤层裂隙层理发育.     

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