尾砂胶结充填采矿法在金属非金属矿山的运用研究

充填采矿法根据回采工作面推进情况,应用充填材料对采空间进行充填的方式,而充填是回采中重要的工序,可以有效控制地压,根据充填材料、输送方式可以分类成干砂、废石类的干式充填采矿法,尾砂、碎石类的水力充填采矿法,尾砂、碎石配合水尼胶凝材料的胶结充填采矿法。本文对尾砂胶结充填采矿法在金属非金属矿山的开采情况进行分析,对尾砂胶结充填工作进行分析,对矿山开采发展有着广阔的前景。     

干式充填采矿法若干技术进步

岩金作为贵金属矿床,提倡使用损失率、贫化率低的充填采矿法开采。文中介绍了近年来干式充填采矿法的试验研究、应用情况,以及若干技术进步;以浅孔留矿采矿法为主的空场采矿法而应用干式充填采矿法主要是形成人工间柱,使相邻采场能应用空场采矿法回采并起到支撑空区的目的,这样的干式充填采矿法有许多独特之处．本文略作介绍。     

充填采矿技术应用及存在问题

本文分析了充填采矿法、崩落采矿法和空场采矿法的主要特点,阐述了我国应用和扩大充填采矿法的必要性,提出充填采矿法应用推广中存在的采矿成本过高问题及解决办法,力争使我国采矿技术应用水平全面达到世界先进行列,提高资源占有率和综合竞争力。     

分层充填采矿法在焦家金矿的应用与发展

介绍了焦家金矿先后试验应用的上向水平分层充填采矿法、机械化上向进路分层充填采矿法及机械化下向进路分层充填采矿法的工艺特点,并提出了几点改进意见。     

分段空场嗣后充填采矿法在程潮铁矿的应用

矿山充填可以保护有限的土地资源,节约开支,实现矿山的无废排放,减少重大安全隐患。随着国家对安全生产及矿山的环境保护要求越来越严格,充填采矿法运用越来越普遍。程潮铁矿目前在使用的充填采矿法有上向水平分层充填采矿法、分段嗣后充填采矿法。介绍了分段嗣后充填采矿法的回采工艺、参数,提出了实际生产中出现的一些问题,并针对这些问题提出了解决方案,同时对回采工艺进行了优化,实现了充填法的安全和高效生产。     

充填采矿法在黄金矿山的应用

一、充填法在黄金矿山使用的概况在黄金矿山由于力求提高黄金资源利用率,充填法所占的比重较其它类型的矿山高,所使用充填法的类型也较多:诸如上向水平分层胶结充填采矿法(焦家金矿、新城金矿),缓倾斜的垂直分条充填采矿法(湘西金矿、新城金矿),削壁充填采矿法(红花沟金矿、金厂沟梁金矿、二道沟金矿、湘西金矿),下向分层胶结充填采矿法(招远金矿灵山分矿)和已设计完毕尚未投产的三山岛金矿拟采用点柱尾砂充填采矿法.     

干式与削壁充填相结合采矿法在二道沟金矿的应用

介绍干式与削壁充填相结合采矿法在二道沟金矿的应用情况,它解决了破碎岩矿体的采矿问题,为其它矿山类似矿体的回采提供实践经验。干式与削壁充填相结合采矿法是结合普通干式充填和削壁充填法的特点,总结出的一套新的采矿方法。干式与削壁充填相结合采矿法选取了普通干式充填法的采矿损失率和贫化率低,适应矿体形态的各种变化,充填料来源广泛与便宜的特点;同时也选取了削壁充填法架设溜矿井,矿石由溜矿井放出的特点;干式与削壁充填相结合采矿法也采用普通削壁充填采矿法的采切与回采工艺。     

盘区机械化宽进路充填采矿法在河西金矿的应用

充填采矿法在中国胶东地区应用十分普遍。根据河西金矿矿床开采技术条件及生产状况,介绍了浅部采区上向水平分层充填采矿法和深部资源盘区机械化宽进路充填采矿法回采工艺过程及应用效果。工程实践表明,盘区机械化宽进路充填采矿法较上向水平分层充填采矿法具有生产效率高、地压控制能力强以及生产成本低等优势,已成为河西金矿深部资源开发的首选采矿方法,完全满足河西金矿深部资源开发的生产需求。     

上向分层充填采矿法在金属矿实际运用的综合分析

按照国家安全生产监督管理局的要求,要逐步提高充填采矿法在金属矿山开采中的比重,本文对该种充填采矿法的内涵和优势进行阐述,以山西省A矿为例,对该种方法的运用方式予以探究。对上向分层充填采矿法应用的注意事项予以逐条说明。此次研究明确了上向分层充填采矿法的优势,进而使得该种采矿方法在金属矿山的广泛应用。     

江砂充填料在武山铜矿的应用

分析了江砂充填料的物理性质，并根据其充填特性，分别介绍了江砂充填料在武山铜矿北矿带下向进路充填采矿法和南矿带上向斜壁进路充填采矿法中的应用情况。     

尾砂水力充填和尾砂胶结充填系统的应用

介绍了尾砂水力充填和尾砂胶结充填系统在三山岛金矿的应用情况。通过不断完善并采取种种处有效措施，基本上满足了井下充填要求，提高了胶结充填层强度，并降低了充填成本 。     

Investigation of the performance of an expandable polystyrene injector for use in the lost-foam casting process

A significant portion of casting defects in the lost-foam casting (LFC) process can be traced back to a lack of consistency in the expandable polystyrene (EPS) foam pattern. The present study focuses on determining the cause of EPS foam-pattern irregularities through the investigation of the two-phase flow of an EPS bead injector. The process variables studied during this experiment include fill time, fill pressure, EPS bead canister pressure, and fill-hose diameter. It was found that the air flow rate under a vented EPS-bead-canister condition using a 1.90-cm (3/4-in.)-diameter fill hose increases 51 pct from a 276 kPa (40 psig) fill pressure to a 552 kPa (80 psig) fill pressure, and the EPS bead-mass per cycle for a 3-second fill time increased 28 pct, from a 276 kPa fill pressure to a 552 kPa fill pressure. It was also discovered that the air flow rate under a pressurized EPS-bead-canister condition is not a strong function of fill pressure, but instead strongly depends on the EPS bead canister pressure. The average EPS bead-mass per cycle for a pressurized canister and a 1.90-cm-diameter fill hose increased 45 pct from 55.22 g for a 28 kPa EPS bead canister pressure to 80.21 g for an 83 kPa EPS bead canister pressure at a fill pressure of 276 kPa. The EPS bead-mass per cycle for a 1.27-cm-diameter fill hose exhibited a lower EPS bead-mass per cycle than that for a 1.90-cm-diameter fill hose for both the vented- and pressurized-canister conditions; however, the air flow rates and tip pressures observed for a 1.27-cm (1/2-in.)-diameter fill hose showed similar behavior to those for a 1.90-cm-diameter fill hose. Four correlations are proposed to predict the dimensionless bead-mass per cycle from either the dimensionless fill or canister pressure and the dimensionless fill time.     

武山铜矿下向胶结充填试验方案探讨

介绍了现用的水砂充填采矿法特点及存在的问题:铺底、水砂充填、坑木支护等工艺环节多;充填体强度低;采场压力大;安全管理困难;生产效率低。如改用下向胶结充填采矿法能解决此问题,并介绍了下向胶结充填采矿工艺流程及要注意的技术经济等方面的问题。     

Seismic Performance of Hillside Fills

Permanent ground deformations in unsaturated, compacted hillside fills under seismic loading conditions are discussed, with emphasis given to fill performance during the 1994 Northridge earthquake. These movements represent a significant yet often unrecognized hazard to developed hillside areas, as relatively modest deformations induced widespread damage totaling hundreds of millions of dollars during the Northridge event. The development of grading standards in the Los Angeles area is reviewed to place the seismic fill deformation problem in context with other issues that have shaped design and construction practices for hillside fills. Field observational data on fill performance during the Northridge earthquake is presented, and typical ground distress patterns are found to include cracking near cut/fill contacts, lateral extension and settlement of fill pads, and bulging of fill slope faces. For most sites, the prevalent mechanism of permanent ground deformation responsible for the fill movements is contractive volumetric strain accumulation within the unsaturated fill soils during strong earthquake shaking (that is, seismic compression).     

Experimental Study of the Behavior of a Lumpy Fill of Soft Clay

Land reclamation is a major civil engineering activity in Singapore. Due to depletion of suitable local fills and the cost of imported sand, dredged and excavated clay fills, in spite of their poor engineering properties, are being evaluated as a fill material. To reduce double handling, it is desirable for the clay to be used directly in a lump form, instead of the more conventional slurry fill. While the performance of a slurry fill is relatively well understood, the behavior of lumpy fill is not. This paper reports the results of a laboratory study carried out on lumpy fill made of cubical clay lumps of size ranging from 12.5?to?50?mm. The study showed that the interlump voids are substantially closed at a consolidation pressure much lower than the preconsolidation pressure of the lumps. The study also shows that at a consolidation pressure of about 100?kPa, the permeability of a lumpy fill is reduced to an order similar to that for homogeneous clay. However, the shear strength profile obtained using the cone penetration test indicates that the fill is still highly heterogeneous under a pressure of 100?kPa. When the preconsolidation pressure of the lumps is exceeded, the strength profile becomes uniform. The degree of swelling of the lumps plays a significant role. For fully swollen lumps, the consolidation pressure required to close the interlump voids is considerably less than that if the lumps were not allowed to swell. The coefficient of secondary compression of the lumpy fill is comparable to the homogeneous clay indicating that secondary compression is not a serious issue.     

废石充填采矿法在新桥矿的实践

新桥矿通过合理利用井下矸石及露天部分废石进行充填,解决了矿山充填原料的不足,降低了生产成本,清洁了矿山环境,保障了矿山可持续发展。     

圆筒型混合器中颗粒混合运动的研究

对硅胶颗粒在圆筒型混合器中的混合运动和机理进行了实验研究,分析了填充率、转速等因素对混合过程的影响。研究结果表明:混合过程中颗粒运动的流线不断被拉伸和弯曲,是形成颗粒扩散运动的重要机制;填充率和转速对颗粒的混合运动有明显影响,当填充率不变时,混合效果随混合器转速的提高而提高(接近离心状态之前);当转速不变时,混合效果随填充率增大(不超过70％)而提高。当填充率和转速提高时,颗粒的运动模式由rolling模式向cascading模式发展。     

全尾砂全水速凝胶结充填法的应用研究

论述了全水速凝胶结充填新材料的特点及全尾砂胶结充填在凤凰山铜矿的工业试验。通过试验说明了该材料比水泥尾砂胶结充填的优越性及其发展方向。