境界外煤炭回收开采的探讨

露天矿开采结束前对境界外煤炭的开采不仅有效的回收煤炭资源,也为矿山创造很好的经济效益。抚顺西露天矿对境界外边坡内的残煤开采进行了探讨,提出了可行的开采方法。

“基于柔模支护的煤矿安全高回收开采关键技术与装备研发及工业化应用”项目通过鉴定

《煤炭信息》周刊2014年第17期报道，中国煤炭工业协会近日组织专家，对西安科技大学与神东煤炭集团、潞安集团、中煤科工集团武汉设计研究院等12家单位共同完成的“基于柔模支护的煤矿安全高回收开采关键技术与装备研发及工业化应用”项目进行了鉴定。

煤矿断层防水煤柱开采回收技术探析

随着能源行业的发展,煤矿的开采技术也在不断提高。但是煤矿开采的深入,断层的受到各种因素的影响,会出现严重的突水现场,对于煤矿的开采安全会造成较大的影响,因此需要对其进处理,避免出矿井事故。注浆法收回断层防水煤柱即为一项防止矿井突水问题的有效方式。文章简要阐述了煤矿断层分类;突水因素,包括内部因素及外部因素;断层注浆加固技术,包括该技术的原理、注浆工艺、具体施工流程、防水煤柱安全回采技术等,为从该行事业的人员提供一定的参考与借鉴。

浅析如何实现磷矿石开采回收率的提高

随着工农业不断的发展，对磷矿石的需求量逐渐增多，虽然我国为磷矿石生产大国，但是在开采过程中总会出现一些问题，特别是开采率损失问题。随着开采量逐渐增多，磷矿石资源浪费更加严重。在这种情况下，就应该采用相应采矿方法及一系列切实可行的措施解决这一问题。就目前来看，提高磷矿石开采回收率已经成为磷矿石产业发展的必然趋势。本文主要从影响磷矿石开采回收率的因素、提高磷矿石开采回收率主要措施等方面出发，对提高磷矿石开采回收率进行分析。

浅谈煤矿综采放顶煤开采工艺

介绍了综采放顶煤开采方法与采煤类型,结合实际工作经验对综采放顶煤开采工艺进行了重点论述,研究提高综采放顶煤开采回收率的途径,以期为综采放顶煤的推广与应用在技术上提供保证。

煤矿综采放顶煤开采工艺探究

针对煤矿综采放顶煤开采工艺,探讨了综采放顶煤开采工艺的相关问题,及如何有效提高综采放顶煤开采回收率的方法,为应用和推广综采放顶煤技术提供一定的参考。

注浆法回收断层防水煤柱

文章介绍了井下煤层断层的分类和煤矿断层突水的原因,并着重阐述了断层带的注浆加固技术与断层防水煤柱安全回采技术,认为采用注浆法回收断层防水煤柱,可为井下作业人员提供安全作业环境,同时对煤矿企业的可持续发展也有积极意义。

大巷蹬空支护技术在煤矿节能中的应用

为减少有害气体超限现象,煤矿企业现已逐步采用大巷蹬空支护技术。叙述了大巷蹬空支护技术的运行原理,并在此基础上指出,该项技术对确保永煤公司正常采掘接替和生产任务顺利完成有着十分重大的意义,且也可为类似煤层赋存条件下的其它盘区提供借鉴,具有显著的经济和社会效益。

Orthogonal design and numerical simulation of room and pillar configurations in fractured stopes

Room and pillar sizes are key factors for safe mining and ore recovery in open-stope mining. To investigate the influence of room and pillar configurations on stope stability in highly fractured and weakened areas, an orthogonal design with two factors, three levels and nine runs was proposed, followed by three-dimensional numerical simulation using ANSYS and FLAC3~. Results show that surface settlement after excavation is concentrically ringed, and increases with the decrease of pillar width and distances to stope gobs. In the meantime, the ore-control fault at the ore-rock boundary and the fractured argillaceous dolomite with intercalated slate at the hanging wall deteriorate the roof settlement. Additionally, stope stability is challenged due to pillar rheological yield and stress concentration, and both are induced by redistribution of stress and plastic zones after mining. Following an objective function and a constraint function, room and pillar configuration with widths of 14 m and 16 m, respectively, is presented as the optimization for improving the ore recovery rate while maintaining a safe working environment.

Technological optimization of fully mechanized caving mining face with large mining heights

Fully mechanized cave mining with large mining height is a new mining method, due to its large mining thickness and lower roadway excavation, the technology has been widely used in China＇s thick seam mining. In order to improve the top-coal recovery ratio of fully mechanized cave mining with large mining height, a study was conducted on optimizing the caving process, based on the mechanized caving face 1302N in Longgu Coal Mine. This was achieved by improving the PFC numerical calculation methods, and establishing a more accurate model system. On this basis, the recovery ratio of the top coal in different drawing intervals and technologies was investigated in order to achieve a reasonable caving process. The top-coal tracking system was used for practical surveying of the recovery ratio of top coal.

加强矿山“三率”管理之我见

矿山生产的开采回收率、采矿贫化率、选矿回收率，是矿产资源开发利用和矿山企业管理的综合质量指标，文中简要介绍这“三率”的定义和计算方法，及加强“三率”指标管理的一点经验。

Overlying strata movement of recovering standing pillars with solid backfilling by physical simulation

To analyze the overlying strata movement law of recovering room mining standing pillars with solid backfilling.Physical simulation experiments with sponge and wood as the backfilling simulation material were tested.The results show that:(i) The covering-rock mechanics of the overly strata comes from "two-arch structures + hinged girder + bend beam" to "backfilling material + hinged girder + bent beam" by increasing the fill ratio from 0%to 85%,the beginning of overlying strata movement appears later and the total duration of subsidence velocity increased from zero to the highest value increases.The trend of "single polarization" of the subsidence velocity curves becomes noticeable and the velocity variation trend becomes stable,(ii) The equiponderate aeolian sand was added to improve the anti-pressure ability of the loess,and the corresponding ground processing & transportation system was designed.

Surface mining subsidence control based on grouting-recovery ratio theory

From an analysis of the relationships of grouting coefficients under the conditions of grouting reducing subsidence, it is concluded that the reducing subsidence rate is in direct proportion to the grouting-recovery ratio, and its proportional coefficient depends on the coefficient of reducing subsidence and collapsing coefficient.The coefficient for reducing subsidence volume φ=ΔV/V_(ash) is related to overburden lithology.The coefficient for reducing subsidence volume φ is always larger than 1.This improves the reducing subsidence rate,the grouting-recovery ratio, and the coefficient for reducing subsidence volume, which can maximize the control of surface subsidence.

龙安煤田局部厚煤层采煤方法探讨

一、研究龙永煤田局部厚煤层采煤方法的意义 龙永煤田是福建省重要产煤区之一,主要含煤地层为下二叠统童子岩组,含煤面积1700平方公里。已探明的无烟煤地质储量为4.09亿吨。含可采和局部可采煤层18层,以薄及中厚煤层为主,受地质因素影响,个别煤层在局部地段增厚,成为厚煤层。据对龙永煤田境内部分矿井局部厚煤层的调查表明,工作面回采率平均仅有60.4％,最低为33.5％。与原部颁标准93％相比,分别低32.6％和59.5％,差距悬殊。