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秦皇岛港矿石装车楼有两条作业线,但仅有一台摆动溜槽,通过摆动溜槽在两作业线之间的横移实现装车作业。1使用中存在的问题摆动溜槽原设计由两台液压马达通过同步轴上的齿轮与装车楼支撑梁上的齿条啮合,驱动溜槽做往复运动。为了使溜槽两侧的行走轮同步运动,两台马 相似文献
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初始装车时,装车溜槽相对于列车车厢前边缘的水平距离和相对列车车厢上边缘的垂直距离是煤炭快速定量装车系统的2个主要装车参数。目前这2个参数的确定主要是依据经验,没有理论计算的支持,针对这一问题,提出了基于圆台假设的计算模型和基于棱台假设的计算模型,并通过对比选择了更容易计算的棱台模型确立了这2个参数的数学计算关系式,为全自动装车时溜槽的位置控制提供了计算依据。分析了在特定装车参数下车辆位移与煤炭装车体积之间的函数关系式,为装车过程中给煤机给料量的控制提供了依据。 相似文献
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针对中硬岩层的特点设计了一种孕镶金刚石复合片钻头,介绍了其切削结构、特点及切削原理。在钻进中硬岩层时,复合片切削齿和孕镶金刚石后支撑能够共同发挥切削作用,提高钻头钻进效率和钻头的稳定性并且能使钻头具有较长的寿命。 相似文献
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电动机械取心钻具反扭装置实验台设计及实验 总被引:2,自引:2,他引:2
Anti-torque device with high torque is one of the main parts of the electromechanical coring tools of armored cable type for sub-glacial bedrock drilling, the failure of this device will cause the drilling process ceasing, even will lead to the drill falling off and other drilling accidents. The experimental stand of anti-torque device for armored cable assembly is designed; the paper introduces in detail the design concept, design principle, main structure parameters and the preliminary experimental results. This experimental stand can test the anti-torque of the anti-torque device in any combination with ice of different temperature and borehole of different diameter, and can show the sliding down resistance. The preliminary experiments verify that the experimental stand works well, and it can provide an important basis for the better selection of anti-torque device type and optimal operation parameters. 相似文献
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随着易分选硫化铜矿日益消耗,氧化铜矿的开发显得尤为重要。针对硅孔雀石矿石采用直接浮选法存在捕收剂捕收能力不足的问题,研究中以苯甲酸甲酯和盐酸羟胺为原料合成了苯丙羟肟酸(BPHA),应用于硅孔雀石的浮选回收。微浮选试验表明,在pH值为9.0、BPHA用量为120 mg/L的浮选条件下,硅孔雀石的最大浮选回收率可达到75.2%。通过接触角、吸附量分析得出BPHA能提高硅孔雀石表面的接触角,增强其表面的疏水性。通过红外光谱(FT-IR)、X射线电子能谱(XPS)和扫描电子显微镜能谱仪(SEM-EDS)分析得出,BPHA与硅孔雀石作用后吸附在矿物表面,改变了矿物表面化学性质,并在矿物表面生成了疏水性的BPHA-铜物种,从而增加了硅孔雀石的可浮性。 相似文献
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本文在文献研究和实地调研的基础上,对比分析了开滦煤矿和遂昌金矿环境治理运作模式,分析发现开滦煤矿和遂昌金矿在矿山环境治理运作方式上的差异主要体现在治理主导者、治理主体、投资主体与融资模式、实施步骤和实施策略以及治理开发方式等方面。研究发现,矿区土地性质、参与主体利益诉求、环境问题性质及规模、矿区区位、矿山资源禀赋以及可资利用的条件等要素是造成两个矿山环境治理运作模式差异的主要原因。进一步分析发现,开滦煤矿环境治理运作模式,主要适应于毗邻城市、对城市生态环境影响巨大、以大面积采空区塌陷为主要地质环境问题的煤矿矿山废弃地的治理恢复;而遂昌金矿环境治理运作模式,主要适应于具有丰富矿山文化遗产资源和发掘价值、矿区在自然生态环境良好山区的金属类老矿山的治理恢复。 相似文献
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An isotopic and geochemical study of surface water and groundwater was undertaken at the Sullivan Mine, a sediment-hosted Pb-Zn massive sulphide deposit with a well-defined homogeneous Pb isotopic composition. The Pb isotopic composition of surface water and groundwater samples from near the mine site define a mixing line between Sullivan Pb and at least one other end member. The 18O and D isotopic results fall along an evaporation line that shows mixing between water from evaporative sources with water from meteoric sources. 相似文献
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M. Mutlutürk 《Journal of Mining Science》2007,43(1):67-72
The lack of a proper decision variable impedes the planning of dimensional stone quarry operation. So far, “quasi-grade”,
which may measure the stone quality, developed via multivariate statistical methods is offered as decision variable. However,
the marketable blocks of dimensional stones should satisfy not only stone quality requirements, but also conform to certain
dimensional standards, and these two are essentially incommensurable. Clearly, for stone with known quality, the amount of
marketable dimensional stones (MDS) provides the best decision variable for planning (i.e. sequencing the operation of unit
volumes). A method for determining the amount of MDS before actual extraction is presented.
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Translated from Fiziko-Tekhnicheskie Problemy Razrabotki Poleznykh Iskopaemykh, No. 1, pp. 75–80, January–February, 2007. 相似文献
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为了解决我国矿产资源日益突出的供需矛盾及重点资源后备储量严重不足的问题,我国在挖掘国内资源的同时,充分利用海外资源实施大型国有矿业资源型企业“走出去”战略,寻求和建立海外稳定的资源供应基地,成为维护我国经济安全,保障我国社会可持续发展目标的必然选择。为此,我国应成立政府专门部门协调和统筹大型国有矿业资源型企业国际化经营战略,制订大型国有矿业资源型企业走出去的国内扶植政策,开展围绕海外资源获取的资源外交;在税收、金融、社会咨询、军事保障等多个方面积极构建大型国有矿业资源型企业国际化经营的外部保障体系。 相似文献
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The influence of MoS2 on the tribology characteristic parameter of Ni60A/MoS2 composite lubricating coating was researched on the UMT-2 fretting abrasion tester (USA). The result shows that with increasing
content of MoS2, the hardness curve of the composite coating decreases and the trend accelerates. Under the same experimental conditions,
the mass loss of plasma spray composite coating without adding MoS2 is 1.27×10−2 mg. When the amount of MoS2 reaches 35%, the mass loss is 0.96×10−2 mg. It can be seen that adding MoS2 phase can improve the wear resistance, the amplitude of which is close to 30%. The friction coefficient of plasma spray composite
coating without adding MoS2 is 0.23. Adding MoS2 could decrease the friction coefficient of the coating and presents a downtrend. When the mass fraction is 35%, the friction
coefficient is the smallest (0.13), and the range is doubled. 相似文献
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我国是世界上最大的黄金生产国、消费国,也是最大的黄金进口国。依据全球黄金储量、生产与消费的统计分析,得知“一带一路”包括的国家黄金储量占全球的65%,但产量只占39%,有继续扩大生产的潜力,同时消费占51%,有扩大生产满足市场需要的空间。基于国内金矿床的规模不大、品位不高、总量有限等问题,未来黄金的需求很难自给自足,需要海外投资进口来满足日益增长的黄金需求。考虑到国家“一带一路”大战略的推动,文章综合分析了世界以及“一带一路”相关国家的金矿资源与生产现状、黄金市场形势、 “一带一路”相关国家的投资环境,提出3个海外金矿投资的首选地区:1)俄罗斯、蒙古国;2)哈萨克斯坦、乌兹别克斯坦、吉尔吉斯斯坦、塔吉克斯坦、巴基斯坦和伊朗;3)南非、埃塞俄比亚、肯尼亚、坦桑尼亚、刚果等,并给出相应的投资策略。 相似文献
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The electrochemical treatment of COD contained in biologically pretreated coking wastewater treated by a three-dimensional
electrode system with modified coke as the particle electrode was investigated. And the electrochemical perfomance of the
coke modified with various active components was studied. The results show that the coke modified with Fe(NO3)2 has the lowest energy consumption and higher COD removal rate under the same condition, and the modified coke has better
surface characteristics for the purpose of this study. In addition, the kinetic constant was also calculated. The study shows
that the three-dimensional electrode system with Fe (NO3)2-modified coke can give a satisfactory solution in biologically pretreated coking wastewater. 相似文献