大间距无底柱开采进路应力状况研究

大间距无底柱分段崩落采矿法是近年来形成的一种新的无底柱采矿结构,针对该结构开采中的进路布置,在梅山铁矿采用现场监测、三维有限元数值模拟等手段,分别比较了15 m×15 m、15 m×20m种采场结构(即大间距结构与普通进路结构)的进路间柱的应力变化差别,通过对比监测及分析认为,采用大间距无底柱开采,其间柱所受应力得到了较大改善,该结构参数在应力大、采场地压显现严重、矿岩破碎等矿山应用,将有效地减少工程支护量,降低矿山开采成本.     

大间距无底柱采矿新工艺工业试验

为验证大间距结构理论模型、实验室研究的结论 ,梅山铁矿在现场按 15m× 2 0m大间距结构参数建立了试验矿块 ,通过现场工艺试验 ,全面掌握了大间距结构条件下采矿的基本规律 ,确定了适合于 15m× 2 0m大间距结构参数的凿岩爆破参数、采掘设备配套、三级矿量优化管理等 ,在试验矿块研究的基础上 ,进行了少量推广 ,为大规模应用打下了基础。     

北洺河铁矿无底柱分段崩落法大结构参数确定

为提高北氵名河铁矿的采矿技术 ,开展了无底柱分段崩落法大结构参数的研究 ,研究确定了采用 15m× 18m的大结构参数及与该结构参数对应的爆破参数。该工艺已在北氵名河铁矿生产中应用 ,表明研究确定的结构参数及爆破参数合理 ,经济效益显著 ,作业条件改善。     

无底柱分段崩落法沿脉进路大断面出矿研究

针对无底柱分段崩落法沿脉布置采矿巷道存在混岩率大、回收率低的问题 ,试验了将沿脉断面从 3.4m× 3m提高到 6 5m× 3m ,试验结果表明 ,矿石回收率可以由原来的 5 5 %提高到 75 %～ 80 % ,年可多回收矿石15 94万t,年创经济效益近 4 0 0万元。     

梅山铁矿加大出矿设备的研究

结合对梅山矿业有限公司开展的采矿开采结构参数由 15m× 15m进一步扩大到 15m× 2 0m的大结构参数研究 ,从技术、经济上分析了一次崩矿量增大的情况下设备的合理配套问题 ,进行了将出矿铲运机增大到6m3 的论证 ,结果表明 ,增大出矿设备斗容既便于组织生产 ,又有显著的经济效益     

高分段大间距无底柱分段崩落法在大红山铁矿的应用

以放矿理论研究为基础,优化采矿结构参数为切入点,提出了高分段大间距的采矿理论,通过采场试验及生产实践验证,高分段大间距(20m×20m)无底柱分段崩落法在大红山铁矿采矿生产实践中的应用是非常成功的。     

下告铁矿最佳采场结构参数研究

下告铁矿采用无底柱分段崩落法开采。为适应矿山设备大型化的趋势,决定采用采场大结构参数,以提高矿石产量,降低采矿成本。通过放矿模拟实验对大结构参数进行了系统的研究与分析,得出了在分段高度15m的条件下最佳进路间距为15m,崩矿步距为1.4m,并确定了合理的出矿截止品位和出矿管理方式。     

无底柱分段崩落法大间距结构参数研究

从理论上入手分析了无底柱分段崩落法结构参数的演变过程，分析了大间距结构下爆破堆积和矿石脊部残留结合体与放出体的吻合关系，论证了大间距结构参数的合理性，并通过实验和实践进行了验证。也验证了这种能够大量减少采准工程量、降低采矿成本、提高设备利用率和采矿强度的大间距结构参数的无底柱分段崩落法必然是无底柱分段崩落法的发展方向。     

梅山铁矿无底柱分段崩落法崩矿步距研究

崩矿步距是框定放出体三维结构参数中的重要一维 ,当分段高度进路间距已定时 ,对放矿效果有着决定性的影响。为寻求适应于 15m× 15m结构参数下的合理崩矿步距 ,本文对 15m段高 ,15m间距下的放矿步距与矿石损失贫化指标的关系 ,分别进行了物理模拟、计算机仿真、放出体工业试验及现场崩矿步距工业试验。     

无底柱分段崩落法大间距结构参数的研究与实践

分析了无底柱分段崩落法大间距结构参数间的关系，提出了无底柱分段崩落法放出体的空间排列形式，建立了数学模型，进行了实验室实验和工业试验，确定了分段高度、进路间距取值条件和大间距条件下合理崩矿步距的取值范围。通过实践验证了大间距结构参数开采能够大量减少采准工程量、降低采矿成本、提高设备利用率和采矿强度，是无底柱分段崩落法的发展方向。     

Market and recycling of NiMH battery

<正>Market status and future trend of NiMH battery1.Global market of small NiMH battery Global market size of small NiMH batteries declined year on year since 2011.The trend will continue to 2018,at the rate of 5%to 10%annually.Demand for small NiMH batteries will be stable gradually.Many electrical apparatuses are powered by the built-in lithium battery today,which is the main reason for the shrunk market of small NiMH batteries.But,for some products,small NiMH     

China rare earth market review

正September 1-10,2014 Affected by the National Day holiday,rare earth transaction was stagnant and the market showed a weak steady state.As there was no good news for downstream market,some products with flat demand would likely rally slightly for some time to     

Current situation and future trend of China rare earth luminescent material industry

<正>Rare earth luminescent material is one of the most important application sectors of rare earths.China enjoys the exceptional advantage to develop rare earth luminescent material for its abundant rare earth resources.After several decades'endeavor,China's rare earth luminescent material industry,headed by rare earth phosphor for lamp and LED and high efficient rare earth energy-saving light source,has been gradually developed into a scale industry.China has become a major production base of rare earth phosphor for lamps and rare earth     

China rare earth market review

正June 1~10,2014Rare earth market remained weak.Quoted price of rare earth products was similar to that in May.There was no sign of recovery in downstream market.The market of NdFeB magnetic materials and phosphor was depressed.Catalyst,polishing powder and ceramic industries remained inactive.Demand from downstream industry was soft.Consumers purchased on their needs.Suppliers had strong intention to sell.Prices of rare earth products     

2014 second batch of rare earth quota released

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China rare earth market review

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.     

Galaxy Magnets achieved the net profit of 34.02 million yuan in the first six months of 2014

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.     

Rare Earth Application in Steel in China

<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     

Current situation and future trend of China rare earth luminescent materialindustry(continued)

<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     

稀散金属产业的观察与思考

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.