煤巷快速掘进气相压裂增透技术研究及应用

针对夏店煤矿煤巷掘进工作面瓦斯涌出量高、掘进速度慢、采掘接替紧张等问题,将气相压裂增透技术引入到掘进工作面瓦斯抽采实践中,阐明了低渗煤层气相压裂增透机理,研究分析了低渗煤层气相压裂增透装备系统和气相压裂增透工艺,并在夏店煤矿掘进工作面进行了工程应用。结果表明:气相压裂增透技术具有降低巷道瓦斯涌出浓度、促进巷道瓦斯均衡涌出、提升巷帮钻场瓦斯抽采效果和加快巷道掘进速度等多重作用;实施气相压裂措施后,抽采钻孔的瓦斯浓度、混合流量和抽采纯量得到有效提高,抽采时间内瓦斯抽采纯量是未进行气相压裂的5.12倍;掘进面前方煤体的瓦斯含量及钻屑瓦斯解吸指标K₁有明显下降,其中瓦斯含量下降2 m³/t,K₁值下降0.12 mL/（g·min^0.5）左右;巷道掘进平均单日进尺从4.0 m提升至5.5 m,掘进速度提升显著,极大地缓解了工作面接替紧张问题,保障了工作面的安全高效开采。     

新景矿气相压裂与水力造穴相结合的增透效果研究

如何快速有效地提高低渗煤层巷道掘进速度是目前高瓦斯矿井的一大难题,文章针对新景矿高瓦斯低渗煤层煤巷掘进工作面抽采效率低、增透效果不明显等问题,提出气相压裂与水力冲孔相结合的局部瓦斯治理措施,制定了相应的施工方案,并对抽采效果和掘进情况进行跟踪监测,结果显示:气相压裂-水力造穴孔较普通钻孔抽采浓度提高了5倍,较单纯水力造穴钻孔抽采量提高了2倍,同时减少了掘进过程中的压钻、夹杆等现象。     

气相压裂—机械造穴复合增透技术在新景矿的应用

为了增加松软低渗透高瓦斯煤层的透气性，提高煤巷掘进工作面的进尺速度和抽采效率，提出了气相压裂—机械造穴复合增透技术。分析了气相压裂—机械造穴复合增透的爆破致裂机理，建立了在机械造穴作用下压裂的径向裂隙方程。在新景矿3218掘进工作面开展了现场工业性试验，对比设计3种技术方案结果表明，使用“5+2”模式的气相压裂—机械造穴复合增透技术后,煤层的透气性与常规的机械造穴相比，平均瓦斯涌出量是普通造穴孔的1.45倍，掘进期间巷道瓦斯浓度降低22%，提高了煤巷工作面的进尺和抽采效率。     

水力压裂技术对掘进顶底板的影响考察研究

渝阳煤矿M7煤层具有突出危险性,煤层瓦斯压力大、含量高、煤层透气性系数低,属较难抽采煤层。水力压裂技术能够有效增加煤层的透气性系数,提高瓦斯抽采效果。通过相邻的N3702西回风巷在水力压裂段掘进过程中发现巷道顶板破碎且下沉较严重,锚杆失效较多。因此要对水力压裂对掘进巷道顶底板的影响进行考察研究,并采取有效的支护方式。     

新元矿3号煤层水力压裂增透技术研究及应用

由于新元矿煤层透气性差,原有的针对煤巷掘进采取的抽采方式效率不高,抽采出的瓦斯浓度和纯度较低。本文介绍了采用水力压裂增透技术,扩大裂隙范围,形成贯通的裂隙区域,改善煤层透气性,并在压裂后进行增透效果考察,达到了提高瓦斯抽采效率和的目的,保障了矿井的安全高效生产。     

地面直井大流量水力压裂消突在新景矿的应用

为解决掘进工作面瓦斯突出威胁,提高突出煤层瓦斯抽采效率,实现巷道的快速掘进,以阳煤集团新景矿为研究对象,针对8#煤层南、北回风大巷以及辅运大巷在掘进过程中瓦斯突出危险性较大,掘进工作面推进速度慢的问题,提出在地面施工煤层气立井,采用大流量消突配合地面排采的施工工艺对目标煤层进行压裂,分别对钻进施工、固井施工以及压裂施工方案进行设计,旨在实现煤层瓦斯的有效消突,确保掘进作业的安全性。     

低渗透煤层掘进工作面气相压裂技术应用研究

根据同煤集团某煤矿8406掘进工作面地质情况,对工作面气相压裂钻孔参数进行了设计,每隔5 m布置1个压裂钻孔,每2个压裂孔中间为2个本煤层条带预抽钻孔,并对抽采钻孔间距进行了优化分析,选取6 m间距压裂为最佳方案。对8406掘进工作面采用气相压裂技术后的瓦斯抽采流量进行了测试,测试结果表明,压裂区段单组钻孔瓦斯抽采流量及单孔流量均比非压裂段有较大幅度的提高,气相压裂技术有效地保证了低渗煤层的瓦斯抽采效果。     

底抽巷穿层钻孔水力割缝压裂增透煤层技术研究

针对屯兰煤矿12507突出煤层工作面的工作面巷道掘进时期的瓦斯治理和突出防治难题,提出并试验了底抽巷穿层钻孔水力割缝压裂增透煤层技术,用以提高低透煤层的透气性系数和煤巷条带瓦斯抽采率,结果表明:(1)采取割缝(压裂)综合增透的钻孔,其瓦斯抽采的平均浓度是常规钻孔的2.86倍;(2)支管瓦斯抽采纯流量是未压裂前的2.6倍;(3)煤层残余瓦斯含量下降了3.618 m3/t;(4)割缝压裂综合作业提高了瓦斯抽采效果和抽采效率,具有明显的煤层增透效果。     

松软煤层顶板水力压裂技术研究

针对松软煤层水力压裂钻孔易出现塌孔、抽采效率低等问题,提出顶板水力压裂技术,在新安煤矿14170工作面进行现场试验研究,并对压裂效果进行考察分析。试验结果表明,顶板水力压裂措施未造成巷道变形,对巷道维护没有产生负面影响;压裂钻孔接抽瓦斯后,瓦斯浓度保持在40%以上,单孔抽采纯量高达31500 m~3;采用顶板压裂措施后,工作面防突预测指标均有下降趋势。     

气相压裂技术在掘进巷道中的应用与研究

为解决掘进工作面掘进期间煤层突出性问题,新景矿在掘进工作面采用“5个造穴孔+2个CO₂气相压裂孔”,选用间替造穴,经过气相压裂后,预抽钻孔瓦斯抽采流量提高1.27~2.91倍;瓦斯抽采量是压裂前的1.56倍。采用循环造穴增透与气相压裂增透后,掘进过程中回风巷瓦斯在1%以下,保证了掘进工作面的工作安全。     

China rare earth market review

正November 1~10,2014Chinese rare earth market was still inactive.Demand for rare earth products was weak.Consumers took a wait-and-see attitude for lower price.As it was an off season for rare earth products,it was expected that prices of rare earth could continue turbulence at the bottom in short terms.Due to a sharp drop,demand for rare earth from downstream recovered.Affected by new energy vehicles,wind powder and energy-efficient appliances,production of rare earth permanent     

China rare earth market review

正August 1~10,2014 There was some good news in rare earth industry recently.Restructuring plans of rare earth groups led by Baotou IronSteel Group and Xiamen Tungsten Group respectively have been approved by MIIT.And rare earth storage policy,which had been expected for a very long time,has been launched officially.Pushed by the good news,rare earth price started to rebound since August 5.Price of didymium oxide and dysprosium oxide rose about 1% to 2%,averagely.About 10% of     

China rare earth market review

正July 1~10,2014Due to weak demand from downstream industry and slow transactions,rare earth market remained weak and price of rare earth products continued to decline.There was no sign of recovery in downstream market.The market of NdFeB magnetic materials and phosphor was depressed.Catalyst,     

New energy vehicle:an opportunity for rare earth magnets

<正>Extracted from Securities Guide 1.Popularity of new energy vehicles—an irresistible market trend1.1 Progress of new energy vehicles Chinese Premier Li Keqiang said recently on a visit to Xi'an BYD Autos that new energy vehicles,especially new energy bus,can lessen environment and noise pollution.He encouraged the use of new     

注浆加固技术在十三矿-685 m进风大巷中的应用

针对煤矿开采深度不断向深部延伸,掘进巷道受深部高应力的影响越来越大,巷道围岩整体稳定性差,矿山压力显现越剧烈现象,一般锚网喷加锚索支护无法从根本上控制巷道的变形。总结了平煤股份十三矿-685 m进风大巷注浆加固技术,依据对巷道掘进之后变形监测数据的采集,对巷道变形机理进行分析研究,并对注浆时段进行了合理选择,在对巷道的注浆工艺进行了充分论证的基础上,对巷道进行了注浆。注浆后效果表明:巷道滞后注浆时间段的选择非常重要,巷道在恰当的时间内进行注浆加固施工,能有效控制巷道的变形,巷道注浆后变形量明显减小,岩体的稳定性明显增强,减少了巷道日常维修工作,降低了矿井的生产成本,保障了矿井的安全生产。     

稀散金属产业的观察与思考

分析了近年来国内外稀散金属产业的生产、应用、资源与市场状况.铟锡氧化物靶材、砷化镓晶片、锗红外材料、铼高温合金和硒在电解锰及玻璃的应用等已成为稀散金属的主要应用领域.稀散金属的产量快速增长达到历史高位而导致了市场的失衡.以GaInP_2/GaAs/Ge,CIGS和CdTe为代表的非硅系太阳能电池是稀散金属的新兴应用领域,将给稀散金属带来日益增长的需求.     

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.     

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     

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