共查询到20条相似文献,搜索用时 62 毫秒
1.
黄麦岭磷矿露天转地下所面临着怎样选取合理充填材料、充填料配比以及合理选取矿房、矿柱宽度的问题,为此进行了充填体的配比试验,同时结合得到的充填体物理力学参数,运用FLAC3D软件对矿块进行了数值模拟,验证了实际充填体强度要求,判断了不同矿块参数情况下矿房的稳定性和安全性问题。研究表明:黄麦岭尾矿库尾砂具有良好的充填特性,试验得到的不同配比充填体在28 d养护临期的强度值在0.18~2.48 MPa之间;不同充填体维持自稳性的极限宽度在18~25 m之间;矿柱采用灰砂比为1∶6的全尾砂胶结充填方案,合理宽度为15 m,矿房采用水砂充填,合理宽度为15 m。 相似文献
2.
充填体强度计算及稳定性分析 总被引:1,自引:0,他引:1
三鑫公司通过应用新型尾砂胶结材料,充填体质量性能有了明显的改善,胶结充填体的强度和自立高度能够满足采矿方法的要求.采用类比法、模型法等充填体强度计算方法计算了充填体保持稳定的强度.通过矿房胶结充填体的稳定性分析为二步矿柱回采方案和结构参数的确定提供了理论依据,生产中从技术和经济等方面考虑设计合理的一步骤矿房回采充填体强度,降低了充填成本. 相似文献
3.
空场嗣后充填矿山采场留设矿柱是地下采矿空间的重要结构,其尺寸会影响矿山生产安全、资源回采率以及企业经济效益,针对此类问题,以大牛铁矿为研究背景,基于主成分分析法(Principal components analysis, PCA),根据数值模拟获得的不同矿柱宽度和充填体强度下矿柱最大压应力和剪应力、位移及塑性区占比,构建矿柱稳定性综合评价指标;并以矿柱稳定和经济效益最优为目标,最终确定矿柱宽度和充填体强度。研究表明:(1)融合数值模拟得到的矿柱压剪应力、变形和塑性区的PCA综合评价指标显示,当充填体单轴抗压强度σ=1.5 MPa时,矿柱宽度b=9 m可保证稳定;(2)当矿柱宽度b=10 m时,充填体单轴抗压强度σ可降低至0.5 MPa;(3)当b=10 m、σ=0.5 MPa时,矿柱稳定和矿山效益综合最优。研究方法和成果可供类似工程借鉴。 相似文献
4.
5.
6.
7.
盖伊黄铜矿矿床是由一系列厚约50m的急倾斜扁豆状矿体组成。所用的采矿方法为嗣后致密胶结充填的阶段矿房法。矿房沿垂直走向布置,分段平巷布置在围岩内,由凿岩和出矿横巷连通。阶段矿量基本上分两步骤回采。间隔一个矿杜布置一步骤矿房,可按任一顺序回采其矿量。作为二步骤矿房回采的房间矿柱,从阶段中央向其两翼连续布置,以便尽量减少地压显现。多年来的采样试验表明,矿房充填体强度相差很大,但都不超过4MPa。试验结果证实:在采集的试样中,10%的充填体强度为3~4MPa,12%为2~3MPa,25%为1~2MPa,27%为0.5~1MPa,其余… 相似文献
8.
新桥矿业有限公司采用凿岩台车、铲运机、顶板服务台车配套的机械化水平分层充填采矿法,两步骤回采,矿柱宽度10 m,矿房宽度12 m,最大控顶高度5 m,分层回采高度3.2 m.首先回采矿柱,胶结充填后,形成人工矿柱,在人工矿柱保护下,第二步回采矿房,进行非胶结充填.所采用的采准、切割及回采工艺合理,经济技术指标先进,可供类似条件矿山借鉴. 相似文献
9.
10.
随着绿色矿山理念的发展,崩落法矿山逐渐向充填法转型,隔离矿柱厚度和矿房参数对崩落转充填
后采场整体稳定性具有重要影响。针对张家洼铁矿无底柱分段崩落法转充填法问题,通过理论计算对隔离矿柱位
移进行求解获得保证下部充填采场稳定的隔离矿柱安全厚度。同时,利用 FLAC3D软件对不同矿房跨度和充填工
艺回采过程中的采场稳定性进行分析评价,确定最优采矿工艺和结构参数。研究表明:①12.5 m 厚隔离矿柱能够
满足过渡阶段采场稳定性;②15 m 矿房跨度顶板拉应力集中较大,且顶板位移显著增大,为了确保回采安全,优先
采用 10 m 矿房跨度,在顶板条件好的区域可以考虑采用 12 m 跨度;③采用 3 MPa、4 MPa 和 5 MPa 强度的人工假顶
均可保证下中段开采过程中采场稳定,因此可将 3 MPa 作为人工假顶的充填体强度标准;④阶段矿房内人工假顶
上部采用 1 MPa 充填体整体充填满足二步采充填体单侧揭露稳定要求,可降低原设计多次不同强度分层充填带来
的施工组织难度。 相似文献
11.
《中国稀土信息(英文版)》2014,(12)
正November 21~30,2014Due to weak demand from downstream industries,transactions of rare earth in Chinese domestic market were inactive.It was difficult to sell any rare earth products except for dysprosium oxide and terbium oxide.Suppliers lost confidence in recent market.Demand for rare earth products was soft.Consumers continued to take a wait-and-see attitude.Rare earth export market remained slow. 相似文献
12.
《中国稀土信息(英文版)》2014,(10)
<正>Developing ecological lighting source The world is facing the big problem of energy shortage today and the contradiction between economy development and environmental protection is worsened.Therefore,people are more likely to choose an ecological light source that is more energy efficient and environmental friendly.The choice provides great opportunity for the development of rare earth optical material industry in China.The concept of green lighting positions rare earth luminescent material as a leading player in illumination market.The light source of both rare earth luminescent lamp and LED lamp is ecological and energy saving.This is why 相似文献
13.
《中国稀土信息(英文版)》2014,(8)
正Galaxy Magnet announced its financial results for the first half of 2014 on August 14.For the first six months ended on 30 June 2014,Galaxy Magnet achieved operation income of RMB 182.3 million,up8.40% over the same period of 2013,and the net profit attributable to the shareholders of the listed company of 34.02 million yuan,increasing 35.49% over the same period of last year.Stable performance increase was led by development of new customers and application market of magnets. 相似文献
14.
<正>China has rich rare earth resources.Output of rare earth and steel in China ranks the top first in the world.However,there is still certain distance between the steel produced in China and developed countries from the point of varieties and quality.China still has to import some types of steel.Improving the quality should be emphasiZed in future development of steel industry in China.Rare earth can be used to upgrade traditional steel 相似文献
15.
分析了近年来国内外稀散金属产业的生产、应用、资源与市场状况.铟锡氧化物靶材、砷化镓晶片、锗红外材料、铼高温合金和硒在电解锰及玻璃的应用等已成为稀散金属的主要应用领域.稀散金属的产量快速增长达到历史高位而导致了市场的失衡.以GaInP_2/GaAs/Ge,CIGS和CdTe为代表的非硅系太阳能电池是稀散金属的新兴应用领域,将给稀散金属带来日益增长的需求. 相似文献
16.
《中国稀土信息(英文版)》2014,(7)
正Corun invested another 50 million yuan in power battery for HEV Hunan Corun announced on 27 June that they had signed the cooperation agreement to jointly built Corun(Shaoxing)Autos Power Battery System Co.,Ltd.in Shaoxing Binhai New City.According to the announcement,total registered 相似文献
17.
铜熔炼中锍品位对杂质元素分配行为的影响 总被引:1,自引:0,他引:1
借助于多相、多成分系统中平衡计算的手段,开发出微量元素砷、锑、铋及伴生元素铅、锌等在铜熔炼中分配行为的计算机模型。利用该模型对铜熔炼过程进行计算机模拟,分析了冰铜品位对砷、锑、铋、铅和锌等杂质元素的分压、活度系数及它们在冰铜、炉渣和气相中分配率的影响,并讨论其热力学分析结果对生产实践的指导意义。 相似文献
18.
《中国稀土信息(英文版)》2014,(11)
正November 1~10,2014Chinese rare earth market was still inactive.Demand for rare earth products was weak.Consumers took a wait-and-see attitude for lower price.As it was an off season for rare earth products,it was expected that prices of rare earth could continue turbulence at the bottom in short terms.Due to a sharp drop,demand for rare earth from downstream recovered.Affected by new energy vehicles,wind powder and energy-efficient appliances,production of rare earth permanent 相似文献
19.
《中国稀土信息(英文版)》2014,(8)
正August 1~10,2014 There was some good news in rare earth industry recently.Restructuring plans of rare earth groups led by Baotou IronSteel Group and Xiamen Tungsten Group respectively have been approved by MIIT.And rare earth storage policy,which had been expected for a very long time,has been launched officially.Pushed by the good news,rare earth price started to rebound since August 5.Price of didymium oxide and dysprosium oxide rose about 1% to 2%,averagely.About 10% of 相似文献
20.
《中国稀土信息(英文版)》2014,(7)
正July 1~10,2014Due to weak demand from downstream industry and slow transactions,rare earth market remained weak and price of rare earth products continued to decline.There was no sign of recovery in downstream market.The market of NdFeB magnetic materials and phosphor was depressed.Catalyst, 相似文献