首钢水厂实施铁矿破碎-胶带半连续工程的得与失

介绍了首钢水厂铁矿破碎-胶带半连续工程概况，总结了该项目在实施过程中的经验与教训。     

露天矿半连续运输系统可靠性研究

在以往的露天矿半连续运输系统可靠性分析中 ,实质上一般进行的只是其中的一部分环节即连续部分的可靠性分析。运用排队理论 ,加上相应的假设 ,提出了对半连续运输系统中连续环节前间断部分可靠性分析的处理办法 ,另外提出在进行半连续系统可靠性分析时还应在间断和连续环节间加上储矿仓环节 ,这样才能真正体现整个半连续运输系统的可靠性分析。     

露天矿半连续运输系统可靠性研究

在以往的露天矿半连续运输系统可靠性分析中,实质上一般进行的只是其中的一部分环节即连续部分的可靠性分析。运用排队理论、加上相应的假设,提出了对半连续运输系统中连续环节前间断部分可靠性分析的处理办法．另外提出在进行半连续系绕可靠性分析时还应在间断和连续环节间加上储矿仓环节,这样才能真正体现整个半连续运输系统的可靠性分析。     

山东省汪家沟地区金矿地质特征与找矿标志研究

汪家沟地区位于华北陆块-鲁东隆起区-胶北隆起区-烟台凸起西北部。本矿床应属“破碎带蚀变岩型金矿床”,矿区的主要控矿岩体为磁山岩体,控矿构造为张家断裂蚀变带,主要矿体赋存于张家断裂带主断面一下及其西部次级断裂内,研究结果对矿区以后的地质勘查具有很重要的参考作用。     

白云鄂博铁矿开拓运输系统方案设计及优化

根据白云鄂博铁矿生产现状,按优化开拓运输系统布置原则,对白云鄂博铁矿主矿和东矿开拓运输系统进行设计优化,提出矿山深部开采选用破碎胶带运输系统。详述了东矿矿石运输系统、主矿矿岩运输系统布置方案和工程及设备配置,并进行技术经济方案论证和比较,从中得出了最优开拓运输系统。     

快冷厚带-氢破碎-磁场成型工艺制备高性能烧结钕铁硼磁体

对比分析了我国与西方国家生产烧结钕铁硼磁体工艺差距，指出了快冷厚带制备工艺是生产烧结钕铁硼磁体关键性工艺、核心技术。分别采用快冷厚带-氢破碎-磁场成型工艺和普通铸锭-氢破碎城场成型工艺制备同一成分的烧结钕铁硼磁体。结果表明：钕铁硼快冷厚带“柱状晶”穿透整个带厚、无等轴晶区、无α—Fe相、三相(主相Nd2Fel4B、富Nd相和富B相)分布均匀、耐腐蚀性能好；氢破碎后沿富Nd相均匀破碎，主相晶粒完整；气流磨后为2．8～3．2μm单晶粉末；快冷厚带可以明显提高磁体的各项性能。     

深凹露天矿破碎—胶带运输系统的现状和前景

介绍了破碎－胶带运输系统，特别是可移式破碎机、大倾角输送机在深凹露天矿的应用概况、结构特点、使用效果，以及在我国金属露天矿的应用前景。     

系统仿真技术在地下矿山运输中的应用

开拓运输系统是地下矿山的重要环节,直接影响着矿山产量和运营成本。开拓运输系统属于典型的离散事件,本文对运输系统的仿真原理进行了研究,并通过工程案例对采矿溜井、中段运输、矿石破碎、皮带运输和竖井提升等整个地下矿山运输系统进行了建模和仿真分析,比选了中段运输方案,验证了运输能力,优化了设备匹配,消除了系统瓶颈,研究成果为地下矿山运输系统研究和方案比选提供借鉴。     

粤北丘屋金矿化带的矿化特征

粤北丘屋金矿化带产在构造破碎带与凝灰岩接触部位中,通过对地质背景、矿化特征分析认为其成因为破碎带-蚀变岩型金矿,有一定的找矿远景。     

南芬露天矿北山采区道路和开采的优化设计

针对南芬露天矿多分期分区开采的特点,规划不同分期分区的剥岩进度,适时优化采区的运输道路和开采计划,形成近距离运输道路,并发挥破碎-胶带运输系统的优势,缩短生产车辆的运距,降低矿山运营费用,经济效益可观。     

塑管?混凝土界面密闭性能改善措施

为改善塑管混凝土结构的界面密闭性能,研究了在塑管?混凝土界面粘贴一种双面压敏胶带——Preprufe胶带的作用。通过界面黏结强度、界面渗水高度和界面透气性实验,测得塑管混凝土结构的界面黏结强度、界面渗水高度、气体压力?时间衰减曲线,推导出界面渗透指数。试验结果表明,界面黏结强度与粘贴胶带的宽度的关系可初步认为符合幂函数分布,压敏性粘合剂胶层与液态混凝土在硬化过程中形成的黏结强度远大于普通黏性层与塑管间的黏结强度。粘贴Preprufe胶带可显著提高塑管?混凝土界面抗渗能力。界面渗透指数随粘贴胶带的宽度增大呈明显的递减趋势,粘贴220 mm宽胶带的塑管混凝土试件界面渗透指数仅为基准塑管混凝土试件的2.86%。Preprufe双面压敏胶带在改善塑管?混凝土界面密闭性能上有良好的表现。在工程应用中可综合考虑所需效果和价格成本来选取粘贴胶带的宽度。      

白马铁矿南山采场运输系统优化方案

白马铁矿位于攀枝花市米易县境内,年采剥总量在40Mt左右,运输方式采用汽车运输系统(排土)、汽车与胶带联合运输系统(矿石),运输系统优化对生产运营成本有着显著的效益。     

朱矿采场深部开拓运输系统的改造

针对不同时期的条件和要求,朱家包包铁矿采场深部开拓运输系统做了不同的设计,通过分析这些设计的演变过程,对大型露天矿向深部过渡时有较好的参考借鉴意义。     

Comparison of methods for monitoring solid particulate surface contamination in the workplace

This paper reports an assessment of various methods for sampling particulate surface contamination for use in the field. The results from the study will be used to develop guidance for monitoring particulate surface contamination in the workplace. Three types of adhesive tape, two manual and two 'semi-automatic' wipe methods, and one Smair method were assessed. A field assessment of selected methods was carried out in two stages. In stage one, the manual wipes, semi-automatic wipes and adhesive tape (Scotch Tape) were compared. In stage two, the adhesive tape (Scotch Tape), black forensic tape, clear forensic tape and Smair were compared. Visits were made to ten metal processing facilities and particulate contamination was sampled from six locations at each site. Sampling locations were chosen for their potential as points of worker dermal contact and also to represent a range of surface characteristics. The metal content of the samples were analysed using Atomic Absorption Spectrophotometry (AAS) and X-ray Fluorescence Spectrometry (XRF). It was found that the Smair method proved to be inefficient in removing surface contamination, particularly where the surface was damp or greasy. Tape methods were found to be the most satisfactory and have considerably greater efficiency than wipe sampling. The black forensic tape is the preferred sampling medium as it is highly efficient, reproducible and easy to use.     

紫金山金矿露天采场开拓运输系统优化及改进

随着紫金山金矿东南矿段的划入和入选矿石品位的降低,生产地质储量大大增加,促使开采境界范围扩大,必须对其原有设计的开拓运输方案进行优化和改进,以适应露采变化的新情况。文中详述了露天采场开拓运输系统及其优化和改进,通过优化达到了提高生产能力、降低运输成本的目的。     

Epidermal cells on stubs used for detection of GSR with SEM-EDX: analysis of DNA polymorphisms

DNA from epidermal cells attached to the adhesive tape of stubs employed to collect and identify gunshot residue (GSR) with scanning electron microscope (SEM) was extracted, amplified with PCR and typed. The method allowed identification of specimens when attribution to a definite person was uncertain. These results also suggest that adhesive tape could be used as a non invasive method for obtaining biological material suitable for DNA analysis from the skin surface.     

白象山铁矿开拓运输方案优化选择研究

在矿山设计中,最为关键的是矿床生产规模论证以及采矿设计方案的确定.一旦采矿方法得以确定,优选确定相应的矿山开拓运输方案便十分重要.根据白象山铁矿的地质资源条件以及开采技术条件,指出适合白象山铁矿的采矿方法为连续倾斜进路尾砂充填采矿法和点柱充填采矿法.基于影响开拓运输方案的关键因素,定义了开拓运输设计方案评判指标体系,并建立了利用理想点法进行方案比较优选的方法. 该方法在白象山铁矿开拓运输方案优化选择上为矿山决策人员提供了重要理论依据.      

三山岛金矿西山矿区深部运输系统优化改造工程实践

为实现降本增效,对三山岛金矿西山矿区深部开拓的运输系统进行改造,改变原来无轨运输至地表(或-243 m水平)的运输系统,设计并施工-537 m转运系统.使生产、基建的矿(废)石全部转运至新立矿区-600 m水平,由14 t电机车牵引11辆6 m3矿车进行有轨运输,通过新立主混合井提至地表.优化改造后的运输系统平均运距减...     

Reactivity of monoclonal antibodies 17.13 and 63.12 with oral epithelial dysplasia and hyperkeratosis

OBJECTIVE: Patients in the neonatal intensive care unit require life support and monitoring equipment that must be securely attached to the skin; removal or replacement often causes skin trauma. In this study, we compared the effects of application and removal of three different adhesives on the skin barrier function of premature neonates. The effects were measured by transepidermal water loss (TEWL), colorimetric measurements, and visual inspection. DESIGN: Thirty neonates, between 26 and 40 weeks of gestational age and with birth weights ranging from 690 to 3000 gm, were enrolled in the study during the first week of life. Pieces of plastic tape (1 cm2), pectin barrier, and hydrophilic gel were applied to previously undisturbed sites on the back. A fourth site was used as a control. We measured TEWL, colorimetric readings, and visual inspection scores of skin irritation and stripping at each of the four sites serially: before adhesive application, 30 minutes after adhesive removal, and 24 hours later. RESULTS: Thirty minutes after adhesive removal, TEWL, colorimetric measurements, and visual inspection scores were all significantly higher at the sites of plastic tape and pectin barrier removal than at the control and gel adhesive sites (p < 0.01), demonstrating greater disruption of skin barrier function with removal of the plastic tape and pectin barrier. When the neonates were divided into three groups on the basis of birth weight (< 1000 gm [n = 10], 1000 to 1500 gm [n = 11], and > 1500 gm [n = 9], the same pattern of greater disruption in skin barrier function, as measured by TEWL, was observed in each birth weight group. Twenty-four hours after adhesive removal, TEWL of the plastic tape and pectin barrier sites were not significantly different from the control site, indicating recovery of skin barrier function. CONCLUSIONS: This study demonstrates that a single application and removal of two commonly used adhesives, plastic tape and pectin barrier, disrupts skin barrier function in neonates of varying gestational ages.     

昭通市铅锌矿井下通风系统改造设计风量计算

通过对昭通市铅锌矿井下开拓系统、提升运输系统、通风系统及各分层采矿、掘进工程空区关系的详细了解、认真核对,按今后30万t／a采矿规模配套的通风系统风量要求进行详细的风量计算,为下一步通风系统改造设计提供参考依据。