崩落矿岩散体流动规律研究

从崩落矿岩散体物理力学性质出发，对矿岩散体流动规律进行了理论分析，把矿岩散体流动规律研究分为两个过程：整体流动和细小颗粒渗透流动。通过试验探明了放出体形和大小受矿石块度组成的影响情况；同时，采用不同矿石颗粒和废石颗粒组成，对覆盖岩层下放矿进行室内试验，分析了废石层细小颗粒渗透的过程和机理，以及细小颗粒渗透作用对放矿贫化的影响，为放矿贫化研究提供理论和试验依据。     

矿石回收率与贫化率关系的实验研究

分析了非均匀崩落矿岩散体在放矿过程中的流动特点，通过相似模拟实验，得出了非均匀矿岩散体在放矿过程中，放出矿石贫化的主要原因是放出口矿岩界面漏斗破裂，而不是矿岩颗粒在下移过程中的相互掺杂；在覆岩废石颗粒粒径大于或与矿石颗粒粒径接近时，采用见到废石漏斗破裂便停止放出放矿方式，可取得较好的放矿指标；当覆岩废石颗粒粒径小于矿石时，由于细小废石颗粒的穿流作用，使放出矿石过早地产生贫化，为了提高矿石回收率，就应该适当地增加废石的混入量，按照低贫化放矿方式直到见到矿岩界面正常到达出矿水平才停止放矿。采用低贫化放矿方式，低的矿石贫化率同样可以达到较高的矿石回收率。     

白银铜矿出矿控制点选择的实验研究

通过分析非均匀矿岩散体流动特性对出矿控制点的影响，进行了多分段放矿实验室立体实验，结果得出：在白银铜矿崩落矿岩条件下，当矿岩散体覆盖层颗粒不小于矿石时，出矿控制点是在见到覆盖废石正常到达出矿口便停止放矿，就整个矿体而言，可以取得较好的回采指标。当覆盖废石颗粒远小于矿石时，出矿控制点以当次废石混入率取30％为最好。     

端部放矿随机介质理论方程

端部放矿理论研究是放矿理论研究的重心.应用随机介质理论,基于散体随机移动与移动概率分布的一致性关系,且考虑散体二次松散的影响,建立了端部放矿时矿岩散体移动概率密度方程、颗粒移动迹线方程、速度场方程、移动漏斗方程、放出体方程,比较全面地考虑了采场放矿边界因素与散体流动参数对移动规律的影响.各方程中相应参数的物理意义较为明确,并且与模拟放矿实验结果符合良好,对无底柱分段崩落法采场设计和放矿控制具有指导意义.     

覆盖岩层下矿岩流动过程数值模拟

利用离散元中刚性块体模型，模拟了多种放矿制度下，覆盖岩层与矿石的相互作用及移动过程，反映了矿岩的流动特点和接触线变化过程。研究表明，用离散元方法模拟非均匀矿岩散体运动过程是适合的，能够用于采场结构参数优化、出矿方式选择、放矿管理和对矿石的损失与贫化指标进行预测。     

崩落矿岩散体速度场特征

崩落矿岩散体被视作连续介质,从场论的观点出发,系统研究了无限边界条件下崩落矿岩散体移动场的速度场。散体在底部放出口放出过程中,散体移动场中存在散体移动场和散体静止场,且两场在移动边界上必保持连续。在散体移动场中,对于理想散体,速度场为非匀速场和定常场;对于实际散体,速度场为非均匀场和不定常场。在散体静止场中速度场为均匀场和定常场。论文介绍了理想散体和实际散体移动场速度方程,并对散体移动场的速度场特征进行总结和讨论。并进一步对速度场进行了研究,得出了崩落矿岩散体加速度特征。论文研究全面系统,具有较高的理论价值和参考价值。     

崩落矿岩散体密度场特征

崩落矿岩散体被视作连续介质,从场论的观点出发,系统研究了无限边界条件下崩落矿岩散体移动场的密度场。散体在底部放出口放出过程中,散体移动场中存在散体移动场和散体静止场,且两场在移动边界上必保持连续。在散体移动场中,对于理想散体,密度场为均匀场和定常场;对于实际散体,密度场为非均匀场和不定常场。在散体静止场中密度场为均匀场和定常场。论文介绍了理想散体和实际散体移动场密度方程,并对散体移动场的密度场特征进行了系统总结和论证,具有较高的理论价值和参考价值。     

含水量对矿岩散体流动特性影响分析

分析了矿岩散体中水存在的主要形式,阐述了矿岩散体流动性研究的重要性。分析了含水量对矿岩散体流动规律的影响,及其对细小颗粒散体摩擦力和粘结力的作用机理,得出了在放矿过程中,有效控制矿岩散体的含水量,是避免放矿堵塞和放矿大量贫化的重要结论。     

崩落矿岩移动的应力场研究

从微观角度对崩落矿岩散体进行了受力分析,建立了矿岩散体移动的应力方程表达式,为从力学机理上科学地解释放矿中出现的各种现象提供了理论基础。崩落矿岩移动应力方程的建立填补了放矿理论对散体应力场研究的空白,推动了放矿理论研究的发展。     

矿岩散体的非均匀度与放出安息角关系的研究

在矿山生产中，无法直接测出矿岩散体的放出安息角。因此，最好是利用容易测量的参数来求出其放出安息角。而散体的放出安息角可用散体的平均粒径和非均匀度来表示。文章阐述了不同粒级散体的平均粒径和散体非均匀度的计算方法，并建立了矿岩散体放出安息角与非均匀度之间的关系方程。     

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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Annual Report analysis of Chinese rare earth-related listed companies in 2013

<正>Chinese rare earth-related listed companies have published their 2013 annual reports.It can be understood from their reports that production and operation activities of Chinese rare earth-related companies were still heavily affected by macro economy and industrial policies.They basically followed the steps of national economy.In 2013,world economy recovered slowly but the economy     

Market opportunities and challenges for rare earth polishing powder

正1.Status of rare earth polishing powder Rare earth polishing powder with high content of cerium oxide began to replace iron oxide for glass polishing and became one of the key materials in glass polishing process since 1940.Compared with traditional iron oxide,rare earth polishing powder has many advantages,such as fast polishing rate,high polishing quality and long service life.It can achieve good surface quality and improve operation conditions.For example,in lens polishing,the polishing work that cerium     

Baotou Research Institute of Rare Earths developed a new RE alloy preparation technology

正Pyrometallurgy Laboratory of Baotou Research Institute of Rare Earths had independently developed a new preparation technology of rare earth alloy for NdFeB.The alloy can remarkably enhance the coercivity of NdFeB magnet but also evidently reduce the production cost of the magnet.The new master alloy was prepared in the kA pilot-scale electrolytic cell by the independent technology.The rare earth master alloy can be used as the raw material for NdFeB.Compared     

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.