2月份，受春节放假因素的影响，国内煤炭市场的供应量和销售量都相对较低，到2月下旬，煤炭下游行业陆续开工，煤炭的消费量逐渐回升，发运港口和用户企业库存也逐步下降，但是由于下游需求对煤炭市场后期不看好，采购意愿不强，煤炭价格继续下滑。

Continuous basalt fiber is produced by melting basalt rocks at high temperatures and modified according to end-use requirements. Continuous basalt fiber is gaining more popularity than traditional fibers, owing to its chemical, mechanical, and ecological advantages. The basic characteristics of continuous basalt fiber are high durability, high thermal resistance, and compatibility with other materials. Applications of continuous basalt fiber include windmill blades, friction materials, basalt geotextile, car headliners, industrial filets, and fire protection.

Mining equipment is used to extract natural resources such as metals, coal, and minerals; these include iron ore, titanium, bauxite, and copper; gravel, sand, platinum, gold, coal, and salt, and various non-metallic products. Mining equipment includes trucks, dozers, loaders, borers, coal and core drillers, stationary and portable crushers, dryers, feeders, hydraulic pumps, conveyor belts, and compressors.

The mining industry uses a variety of equipment, such as borers, trucks, dozers, loaders and core drillers, stationary and portable crushers, dryers, feeders, hydraulic pumps, conveyor belts, and compressors, to extract natural resources from the earth. These raw materials include metals, coal, and minerals, iron ore, titanium, bauxite, and copper, and various non-metallic components.

为了准确探明露天煤矿开采境界范围内已有的地下采空区,排除安全隐患,基于激光测距与GPS定位原理,采用C-ALS钻孔式三维激光扫描系统对平朔矿区露天煤矿境界范围内的地下采空区进行了全面探测。实践结果表明,该系统可以通过地表延伸至空区的钻孔迅速而安全的对采空区进行激光三维扫描,具有全自动、速度快、精度高、数据处理简便等特点。通过扫描,准确查明了已有采空区的尺寸参数,实现了采空区隐蔽工程的可视化,为露天煤矿地下采空区稳定性评价与治理提供了可靠的基础数据,对指导露天煤矿生产和维护作业人员及设备的安全具有十分重要的意义。

为科学评价老采空区上方建筑地基的稳定性,分析了老采空区进入衰退期后概率积分参数的时变规律,根据地表移动观测站实测数据,建立了老采空区地表残余变形参数与地质、采矿条件之间的综合关系式,以预计时刻、最终稳定时刻的沉降变形预测值之差作为老采空区上方地表的残余沉降变形,并将其与建筑物临界变形值进行对比,进而评价老采空区上方建筑地基的稳定性。分析结果表明:采动程度越大,最大残余下沉系数和最大残余主要影响角正切越小;基岩采厚比越大,残余沉降变形过程持续时间越长;该地基稳定性评价方法顾及了老采空区充分活化时的极限沉降变形,评价结果满足建筑物对安全性的要求。

为了提高矿井资源采出率,解决东峡煤矿同类型赋存煤层的开采技术难题,对其37220工作面采用倾斜分层走向长壁综采放顶煤采煤法。通过理论分析、物理相似模拟、数值模拟及现场观测,对工作面回采巷道布置、“三机”设备选型与配套、矿山压力与顶煤运移规律、工作面围岩应力分布特征与支架稳定性、回采工艺、安全保障技术等进行研究。现场应用结果表明:工作面采用异面空间布置,简化了回采工艺,并提高了支护系统稳定性,基于异面空间布置并采用不同架型的支架能满足工作面生产需要,以“一通三防”为主的安全保障技术有效保障了工作面的安全生产。工作面单产最高达105 kt/月,煤炭采出率89.7%,掘进率25 m/万t,吨煤成本较水平分段放顶煤降低120.95元/t。

This assessment focused on five zinc-bearing minerals. The minerals were subjected to a number of analyses including quantitative X-ray diffraction, optical microscopy, leaching tests, and bioaccessibility and toxicity studies. Like a previous comprehensive assessment of five copper-bearing minerals, the purpose of this assessment was to obtain structural and chemical information and to characterize the reactivity of each mineral to various simulated environmental and biological conditions. As in the copper minerals study, analyses were conducted consistent with widely accepted methods. Unless otherwise noted, analytical methods used for this study were identical to those described in the investigation of copper-bearing minerals. Two sphalerite specimens were included in the zinc-minerals set. One sphalerite was recovered from a mine in Balmat, New York; the second came from a mine in Creede, Colorado. The location and conditions of origin are significant because, as analyses confirmed, the two sphalerite specimens are quite different. For example, data acquired from a simulated gastric fluid (SGF) study indicate that the hydrothermally formed Creede sphalerite contains orders of magnitude higher arsenic, cadmium, manganese, and lead than the much older metamorphic Balmat sphalerite. The SGF and other experimental results contained in this report suggest that crystallizing conditions such as temperature, pressure, fluidization, or alteration processes significantly affect mineral propertiesproperties that, in turn, influence reactivity, solubility, and toxicity. The three remaining minerals analyzed for this reportsmithsonite, hemimorphite, and hydrozinciteare all secondary minerals or alteration products of zinc-ore deposits. In addition, all share physical characteristics such as tenacity, density, streak, and cleavage. Similarities end there. The chemical composition, unit-cell parameters, acid-neutralizing potential, and other observable and quantifiable properties indicate very different minerals. Only one of each of these minerals was studied. Had this assessment included multiples of these minerals, geochemical and mineralogical distinctions would have emerged, similar to the results for the two sphalerite specimens.