矿井生产风险评估

结合煤层地质条件开采工艺适应性评价结果，参照国内外风险评估方法，应用模糊可能性理论，在探讨风险的绝对值和相对值的概念，如何合成事故发生可能性和事故后果严重程度，以及如何确定有多个子评价单元的的评价对象的风险等级划分基础上，利用费效分析法，确定评估指标。     

湿法冶金建设项目安全风险模糊综合评价

将模糊综合评价法应用到湿法冶金建设项目安全评价研究中,建立了湿法冶金建设项目安全风险模糊综合评价模型,并以某镍、钴湿法冶炼建设项目安全评价为例进行了研究,得到了评价对象安全风险等级和影响因素权重值分布,实现了对评价对象整体性量化评估,也为评价湿法冶金建设项目安全状况和风险程度提供了新的研究方法和思路。     

矿井生产风险评估

结合煤层地质条件开采工艺适应性评价结果,参照国内外风险评估方法,应用模糊可能性理论,在探讨风险的绝对值和相对值的概念,如何合成事故发生可能性和事故后果严重程度,以及如何确定有多个子评价单元的的评价对象的风险等级划分基础上,利用费效分析法,确定评估指标。     

基于模糊综合评价的铁矿石海外投资风险分析

随着我国铁矿石供需缺口的逐年加大,铁矿石海外投资步伐正逐渐加快,对投资风险的分析成为研究的热点问题。根据矿产资源投资理论、风险评估理论,通过专家调查方式确定了影响铁矿石海外投资的分层评价指标体系。采用层次分析法和模糊综合评价法相结合,建立了多层次模糊综合评价模型。该模型为投资者科学客观地评价海外投资风险提供了量化依据,有效地降低风险,提高了投资决策水平。最后,以西澳大利亚某铁矿项目为研究对象,验证了该方法的可行性和有效性。     

煤矿安全管理风险评价研究

基于安全管理学原理和模糊理论以及大量的现场调研，通过分析煤矿安全管理组织的风险结构，提出安全管理组织风险评价指标体系，建立了风险评价的层次结构模型。运用模糊风险评价方法对安全管理组织危险源进行系统地研究。     

基于Fisher判别法的金属矿山投资风险评价

传统的金属矿山投资风险评价方法具有程序复杂、推理速度慢、精度较低等问题。根据金属矿山投资实际情况,综合考虑投资的地质、生产、市场、社会和管理风险,应用Fisher判别理论,选取13项投资风险评价指标作为判别因子,建立金属矿山投资风险评价的Fisher判别分析(FDA)模型。将定量化处理后的18组金属矿山投资风险实际数据作为训练样本并进行回判估计检验,误判率为0。将4组未参加训练的数据作为预测样本输入模型测试,预测结果与矿山实际投资风险情况相符。结果表明,该模型回代估计的误判率低,预测精度高,可为金属矿山投资风险评价提供一条新的途径。     

矿山地下采空区稳定性二级模糊综合评价

针对采空区失稳坍塌的复杂性与不确定性,确定影响采空区稳定性的17个主要因素并确定各个因素所占的权重,建立并应用二级模糊综合评价模型对采空区稳定性进行定量分析。研究结果表明:应用模糊数学理论建立的二级模糊综合评价模型能够较准确地反映采空区稳定性程度,与实际情况较符合,为矿山地下采空区的稳定性程度评价提供了一种可行的思路和方法。     

采空区三维风险评价模型研究

通过研究现有的风险评价方法,发现二维风险评价模型的片面和不足之处;在此基础上融入了采空区风险因素重要程度这一属性,提出了采空区三维风险评价模型。对云南某锰矿一采空区建立风险因素评价体系,利用专家打分法对采空区风险发生的可能性、风险后果的严重度和风险因素的重要程度进行定量评价,从而计算出出该空区的风险量,并对其进行分级,得出影响该空区不可接受的风险因素。     

基于Z-number的煤矿瓦斯重大危险源分级研究

为了更加有针对性地防治瓦斯灾害,有必要对瓦斯危险源进行科学评价和治理。从瓦斯危险源导致事故发生的可能性、严重程度和应急救援3个角度,建立瓦斯重大危险源分级评价模型,并结合同煤集团寺塔煤矿实际情况,应用层次分析和基于Z-number模糊数的模糊综合评价方法进行计算。结果表明:该煤矿瓦斯重大危险源的等级为二级,一旦发生瓦斯事故则有可能造成重大事故,须加强监控;各评价指标的排序为瓦斯防控措施人员意识作业人数装备水平……医疗条件。结合研究结果构建煤矿瓦斯重大危险源管控模型,该模型在瓦斯危险源等级评价和管理方面具有实用性和有效性,但还有待深入研究细化评价指标体系。     

基于模糊综合评价的海外矿业投资金融风险评价

本文重点研究模糊综合评价法在海外矿业投资金融风险评价中的运用,对企业进行相关项目的风险识别、规避与控制具有重要参考价值。首先分析了海外矿业投资金融风险的特征并分析了风险成因,然后构建了两级风险评价指标体系和评判隶属矩阵,进行模糊运算后得到一级评价向量,进而借助归一化处理和二级模糊运算得到最终风险向量。以神华集团在澳大利亚的某矿业投资项目为例子进行分析计算,发现该项目总的金融风险指数为3.01,处于"较高风险"和"一般风险"之间。本文研究表明,模糊综合评价法对于海外矿业投资金融风险评价具有一定的推广应用价值。     

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     

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     

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     

2014 second batch of rare earth quota released

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矿用防爆轴流对旋主要通风机叶片ANSYS模态分析及应用

高效节能矿用防爆对旋主要通风机的叶片是主要通风机运行的关键部件,叶片在运行时不断受到气流的作用力,从而使叶片产生振动,当叶片振动的频率与叶片的固有频率接近时,容易产生共振从而导致叶片的断裂。一旦叶片断裂时,对主要通风机的安全运行产生致命的影响,从而导致矿山、化工等企业发生重大事故,将会产生不可估量的损失。基于有限元分析软件ANSYS,对高效节能矿用防爆轴流对旋主要通风机叶片进行模态分析及产生对应的六阶模态频率,对主要通风机叶片的运行频率、固有频率及产生的共振问题进行了原理分析,并且解决了叶片频率共振的问题,从而为主要通风机叶片结构设计提供理论依据,并对主要通风机叶片的安全运行提供保障。     

2013 NdFeB export analysis

<正>China totally exported nearly 24,000 tonsof NdFeB products during 201 3,including 18,825 tons of permanent magnet,valued USD 1.34 billion at an average price of 71.4 USD/kg;3,277 tons of NdFeB magnetic powder,valued USD 1 01 million at an average price of 30.9 USD/kg;1,334 tons of strip casting ribbon,with total export value of USD 74million at an average price of 55.3 USD/kg;and 586