工作面瓦斯涌出量预测及瓦斯来源分析

煤层瓦斯赋存状态是研究矿井瓦斯涌出规律和瓦斯灾害防治的技术基础。某矿5煤层局部瓦斯异常涌出，已经开始对煤矿的安全生产有所影响和制约。于此，笔者采用统计分析和分源计算两种方法，对采掘工作面瓦斯涌出量进行了预测，分析了采掘工作面瓦斯涌出影响因素和涌出来源，得出了煤层瓦斯压力、煤层瓦斯含量、煤层透气性系数、煤层残余瓦斯含量、钻孔瓦斯涌出量等参数，随采深增加而变化的规律，并提出了针对性的防治措施。     

水力冲孔技术在平煤八矿瓦斯卸压抽采的应用

为了有效预防平煤八矿己_(15)-14140工作面煤与瓦斯突出灾害的发生,采用水力冲孔技术进行煤层瓦斯卸压抽采治理,并重点分析了水力冲孔前后瓦斯涌出初速度q和钻屑量S值、瓦斯压力、瓦斯流量、煤层透气性系数等参数的变化规律。     

煤层透气性系数简便测定方法

煤层透气性系数测定中直接测定参数的精确性起着至关重要的作用,为了更加高效、精确的测定煤层透气性系数,研究了钻孔多级流量计多个测定量程的特性,通过测定大量流量的数据,并对数据运用最小二乘法进行优化得出精确的煤层透气性系数和钻孔涌出量衰减变化规律。在鹤煤六矿进行现场试验取得了良好的效果,证明了钻孔多级流量计在精确测定煤层透气性中的重要作用,同时对矿井瓦斯防治工作提供了理论依据,生产更加安全、高效。     

长治沁源某矿井瓦斯地质赋存规律研究

通过对矿井瓦斯地质赋存规律的分析研究,结合矿井瓦斯地质资料和瓦斯测试参数,找出了影响矿井瓦斯涌出量的因素,指出煤层埋深是矿井瓦斯含量、涌出量的主控因素,对该矿瓦斯灾害防治具有指导意义。     

大淑村矿瓦斯赋存规律分析

煤层瓦斯赋存状态是研究矿井瓦斯涌出规律和瓦斯灾害防治的技术基础。通过对大淑村矿瓦斯地质规律的研究,分析了影响矿井瓦斯涌出量的因素,对矿井的瓦斯灾害防治具有一定的指导意义,为煤矿的安全生产及管理决策提供服务。     

霍尔辛赫煤矿瓦斯涌出量预测分析研究

矿井产能提升后,矿井瓦斯涌出量必然增加,为了避免瓦斯灾害的发生,为防治瓦斯,必须了解产能提升后矿井的最大瓦斯涌出量。根据实测的霍尔辛赫煤矿3~#煤层瓦斯含量,对矿井地勘瓦斯含量进行修正,拟合出该矿3~#煤层的瓦斯含量分布曲线,确定矿井瓦斯分布规律,然后采用分源预测法对矿井最大瓦斯涌出量进行预测。     

地质构造对鹤煤五矿煤层瓦斯赋存规律的影响

瓦斯已成为阻碍煤矿生产的突出因素。煤层瓦斯赋存状态是研究矿井瓦斯涌出规律和瓦斯灾害防治的技术基础。通过对鹤煤五矿瓦斯地质规律的研究,分析了影响矿井瓦斯涌出量的因素,同时指出矿井深部含过高瓦斯的构造煤发育区具有煤与瓦斯突出的危险,对矿井深部的瓦斯灾害防治具有指导意义。     

宁发一矿煤层瓦斯参数测定及瓦斯分布规律预测

煤层瓦斯参数是矿井瓦斯防治的基础数据,内蒙古宁发一矿属于技术改造矿井,以往煤层瓦斯参数测定数据极少,日常瓦斯管理工作缺乏技术依据。简述了宁发一矿煤层瓦斯参数的测定方法和过程,测定矿井主要煤层瓦斯压力、瓦斯含量、煤层透气性系数等参数,丰富了矿井瓦斯基础数据体系。评价主要煤层瓦斯可抽性,预测煤层瓦斯分布规律,为矿井瓦斯赋存规律研究和瓦斯防治提供了技术支撑。     

煤矿瓦斯赋存与瓦斯涌出规律研究

 为了超前防治矿井瓦斯灾害,通过讨论影响瓦斯赋存的地质因素,回归分析煤层瓦斯含量和瓦斯涌出量与上覆基岩厚度、顶板20m含泥率及煤厚的关系,研究了煤层瓦斯赋存和瓦斯涌出规律,根据研究结果预测了矿井煤与瓦斯突出危险性,对瓦斯防治工作具有指导意义。     

潞安矿区3~#煤层瓦斯解吸规律的测定

煤层瓦斯含量是矿井瓦斯防治的一个基础参数 ,它对矿井瓦斯涌出量的大小起着重要作用。而在矿井瓦斯防治中 ,更具有实际意义的是煤层在常压下可解吸 (即能够涌出 )的瓦斯量。为了有效地进行瓦斯涌出量的预测和防治 ,就需要掌握煤层瓦斯的解吸规律和可解吸瓦斯量。为此 ,利用井下钻孔法对潞安矿区 3# 煤层可解吸瓦斯量进行了测定 ,并得出了潞安矿区 3# 煤层瓦斯的解吸规律。     

高陡倾斜煤层沿煤层钻井研究——以准南昌吉地区为例

针对准噶尔盆地南缘煤层倾角大、地应力复杂的煤层气井钻探难题,基于弱面理论研究了煤层倾角、地应力、造(降)斜对井壁安全的影响,建立起多目标约束的沿煤层钻井轨迹优化模型。研究表明:(1)昌吉地区煤层倾角为10°~25°,局部达到25°~40°,属于高陡倾斜煤层,具有渗透率各向异性强、地应力各向异性强、岩体力学性质各向异性强的特点。(2)钻水平井时,根据倾角对井壁稳定影响分为作用区、过渡区和反转区,倾角在5°~25°时为作用区,沿倾向钻井最安全,沿走向钻井最危险;倾角大于65°后进入反转区,沿倾向、走向都成为安全钻井方位。地应力各向异性越大,坍塌压力越高、安全钻井方位的范围越小。(3)沿煤层倾向钻井时,倾角小于35°时建议沿煤层上倾方向钻井;倾角大于65°时建议沿煤层下倾方向钻井;倾角在35°~65°范围内井壁安全性最低,建议沿煤层走向钻井;井斜角在45°~65°时是最危险造(降)斜段,应尽量避免在此井斜范围对煤层造(降)斜。(4)为降低煤层着陆点到首靶点的坍塌压力,提出S型、J型两种沿煤层钻井轨迹类型,从对比结果看出本文方法比常规方法设计的井眼进尺更短、摩阻扭矩更小。     

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     

China rare earth market review

正November 21~30,2014Due to weak demand from downstream industries,transactions of rare earth in Chinese domestic market were inactive.It was difficult to sell any rare earth products except for dysprosium oxide and terbium oxide.Suppliers lost confidence in recent market.Demand for rare earth products was soft.Consumers continued to take a wait-and-see attitude.Rare earth export market remained slow.     

Galaxy Magnets achieved the net profit of 34.02 million yuan in the first six months of 2014

正Galaxy Magnet announced its financial results for the first half of 2014 on August 14.For the first six months ended on 30 June 2014,Galaxy Magnet achieved operation income of RMB 182.3 million,up8.40% over the same period of 2013,and the net profit attributable to the shareholders of the listed company of 34.02 million yuan,increasing 35.49% over the same period of last year.Stable performance increase was led by development of new customers and application market of magnets.     

Rare Earth Application in Steel in China

<正>China has rich rare earth resources.Output of rare earth and steel in China ranks the top first in the world.However,there is still certain distance between the steel produced in China and developed countries from the point of varieties and quality.China still has to import some types of steel.Improving the quality should be emphasiZed in future development of steel industry in China.Rare earth can be used to upgrade traditional steel     

Current situation and future trend of China rare earth luminescent materialindustry(continued)

<正>Developing ecological lighting source The world is facing the big problem of energy shortage today and the contradiction between economy development and environmental protection is worsened.Therefore,people are more likely to choose an ecological light source that is more energy efficient and environmental friendly.The choice provides great opportunity for the development of rare earth optical material industry in China.The concept of green lighting positions rare earth luminescent material as a leading player in illumination market.The light source of both rare earth luminescent lamp and LED lamp is ecological and energy saving.This is why