坑外贮矿仓改用振动放矿机

随着生产的发展和条件的改变,我矿各坑口的生产工艺也在不断改进。例如,对原来用电耙绞车耙矿或气闸门放矿的坑外贮矿仓,从1986年起先后改用自制的仿ZF—2型振动放矿机放矿,日出矿量800～1100t,完全满足了生产需要。 1.夹皮沟矿概况该矿位于浑发河大断裂带。矿石硬度f=8～12;自然安息角θ=38～40°;比重2.8t/m~3;松散系数1.6。该矿采用井下深部开采,有四大生产坑口,立井深达56m,双井筒双罐双层罐笼提升,属中型矿山,已开采160多年。     

无底柱分段崩落法放矿方式计算机模拟研究

概述了无底柱分段崩落法放矿计算机模拟(SLS)系统的特点及功能,分析了无底柱分段崩落法截止品位放矿、无贫化放矿和低贫化放矿的特点和适用条件。利用SLS系统对3种放矿方式进行多分段放矿模拟研究后认为,截止品位放矿的贫化率最大;无贫化放矿与截止品位放矿相比较,在矿石回收率基本相同的情况下,贫化率可大幅度降低,在8％以下,当不能一步到位地施行无贫化放矿时,可采用低贫化放矿,逐渐提高截止品位,从而过渡到无贫化放矿。     

对不同放矿截止品位关系的一点新认识

通过对不同放矿截止品位及其相互间的关系进行研究, 有了一些新的认识:组合截止品位放矿方式(形式、方案)包括了一切截止品位放矿方式;根据放矿形式是不可避免的, 组合截止品位放矿可能有许多方案, 无贫化放矿仅仅是其中的一种特殊形式,组合截止品位放矿各种方案中有一种或者几种方案为最优, 可使矿山生产总赢利为最大等等。     

综采放顶煤技术在褐煤层的应用

<正>大雁矿务局一矿开采煤层为第四系褐煤,厚煤层开采一直采用倾斜分层金属网(或尼龙网)假顶.为提高工作面单产效率,降代成本,经技术论证及可行性研究,在厚煤层采用放顶煤综采,并获得成功.1 煤层地质概况综采放顶煤开采煤层为一矿东三采区27~#煤层,该块段煤层位于一矿井田东部,左邻东二采区27~#层采空区,右部F_8断层为界,上部为F_5断层,下部为本层未开采煤体,煤层总体产状大体呈N21°W方向倾斜的单斜构造,倾角为14°～17°.     

自然崩落采矿法研究及应用

自然崩落法是一种高技术含量的地下开采方法,在国外有较好的应用。为更好推广应用自然崩落采矿法,对自然崩落法进行综合评述,包括自然崩落法适用条件和优缺点,放矿理论、矿岩流动特性、放矿控制、放矿生产计划、放矿管理等方面,以及自然崩落法国内外的应用现状。可以得出:前期放矿理论研究,以矿岩流动概率密度函数和放出体形态为主,对矿岩流动过程中品位的变化考虑不足;放矿计划以均匀放矿为目标,没能实现日出矿品位均衡,放矿管理不能进行放矿反馈控制和主动控制。自然崩落法发展趋势是放矿过程考虑出矿品位均衡,使用数据库管理及系统集成,实现放矿可视化、信息化、智能化。     

梅山铁矿加大结构参数过渡分段的研究

为实现梅山铁矿开采结构参数从现有的 ( 1 0～ 1 3)m× 1 0m合理过渡到 1 5m× 1 5m ,对影响过渡分段采矿损失、贫化指标的原因进行了分析 ,采用实验室物理模拟、现场定量测定等手段 ,找出了过渡阶段不同分段矿石流动规则 ,实行了采用截止品位放矿的放矿管理办法 ,在生产中获得成功应用。     

自然崩落法放矿品位预测研究

自然崩落法中放矿品位预测研究旨在提高放矿品位预测精度,降低损失贫化。针对铜矿峪矿自然崩落法放矿高度为120 m的特点,进行了放矿物理模拟试验。通过统计放矿口上方每一层(共13层)颜色的颗粒在不同的放矿量下所占的比例并进行回归分析,提出了任意放矿阶段出矿品位预测模型,品位预测精度达到85%以上,解决了原有的品位计算模型不能针对任意放矿量下的放矿品位进行预测的问题。     

缩小防水煤柱综放工作面矿压特征

任楼煤矿 72 1 2工作面是皖北矿务局任楼矿区第一个放顶煤工作面 ,同时又是巨厚松散含水层下缩小防水煤柱工作面。工作面煤层厚度平均 4 .7m,倾角 1 7°,通过对该面矿压、上风巷支承压力、顶煤、顶底板及巷道两帮位移观测结果 ,分析了巨厚松散含水层下缩小防水煤柱综放工作面矿压特征     

铜坑矿放矿试验研究

为了解决铜坑矿放矿过程中矿石贫化的问题,开展了放矿方式的物理试验模拟研究。并利用大型物理放矿模型,分别进行了平面放矿和斜面放矿两种不同放矿试验;然后以矿石回收率和贫化率为检测指标,对所得结果进行比较。在铜坑矿推行斜面放矿方式是可行的,并推荐采用斜面放矿方案。     

用分段崩落法回采矿柱时矿石损失贫化的确定

佩钦加镍公司开采倾角从0至60°～70°和厚度2～30米的矿体。这些条件不适于用分段平巷矿房法开采。因此,为进行放矿要在阶段间柱和矿块问柱(房间矿柱)下部于矿房底柱中补充掘进放矿漏斗天井。在崩落矿柱的放矿过程中,曾发生过混入上覆崩落岩石或死填废石的现象。     

China rare earth market review

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     

China rare earth market review

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     

China rare earth market review

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,     

New energy vehicle:an opportunity for rare earth magnets

<正>Extracted from Securities Guide 1.Popularity of new energy vehicles—an irresistible market trend1.1 Progress of new energy vehicles Chinese Premier Li Keqiang said recently on a visit to Xi'an BYD Autos that new energy vehicles,especially new energy bus,can lessen environment and noise pollution.He encouraged the use of new     

注浆加固技术在十三矿-685 m进风大巷中的应用

针对煤矿开采深度不断向深部延伸,掘进巷道受深部高应力的影响越来越大,巷道围岩整体稳定性差,矿山压力显现越剧烈现象,一般锚网喷加锚索支护无法从根本上控制巷道的变形。总结了平煤股份十三矿-685 m进风大巷注浆加固技术,依据对巷道掘进之后变形监测数据的采集,对巷道变形机理进行分析研究,并对注浆时段进行了合理选择,在对巷道的注浆工艺进行了充分论证的基础上,对巷道进行了注浆。注浆后效果表明:巷道滞后注浆时间段的选择非常重要,巷道在恰当的时间内进行注浆加固施工,能有效控制巷道的变形,巷道注浆后变形量明显减小,岩体的稳定性明显增强,减少了巷道日常维修工作,降低了矿井的生产成本,保障了矿井的安全生产。     

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.     

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.     

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     

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