早子沟金矿采矿硐室间距和断面优化计算及围岩稳定性分析

早子沟金矿目前已探获金资源储量118t,现已开始开采,由于矿区多数矿体赋存于地表以下,矿区采矿方式以地下开采为主。通过对采矿硐室间距和断面优化计算,用统一的设计变量表示硐室间距和断面特征尺寸,以围岩破坏区的总面积作为目标函数,按使用需求确定了约束条件。建立了数学模型,并对矿区硐室围岩的稳定性进行了简要分析。     

某金矿采选项目周边水域环境现状调查与评价

湖北省咸宁市嘉鱼县某金矿采选项目多年开采对周边水域造成了一定的污染影响,为评估矿山周边水环境质量现状,2014年对周边水域的底泥环境质量现状、浮游动植物组成和丰度进行调查,利用浮游动植物群落多样性指数进行水质评价。结果表明底泥满足土壤环境质量标准》GB15618-1995中的三级标准;检出浮游植物110余种,主要为蓝藻-绿藻型;浮游动物18种,主要优势种为无节幼体、长肢秀体蚤、长腹剑水蚤等;各监测点浮游动植物的 Shannon-Weaver 指数和Simpson指数均低于3,所反映的水体质量在轻-中度污染之间。     

我国黄金工业小矿开采的发展

本文概述了我国黄金矿床的地质特征,小金矿开采历史及其现状.重点介绍潼关与红花沟两个小金矿的开采经验。最后,展望了今后小金矿开采的发展.     

淮南新集矿区土壤重金属污染评价

通过系统采集、分析淮南新集煤矿区的土壤样品,研究了该区煤矸石和粉煤灰堆积对矿区土壤造成的重金属污染。结果表明:尽管研究区只有10余年开采历史,但煤矸石和粉煤灰长期风化、淋溶已导致其周边土壤中重金属累积性污染;不同重金属元素在研究区土壤中累积表现出差异性,但均未超过GB15618—1995《土壤环境质量标准》二级标准。     

张家峁煤矿水库周边开采保护煤柱合理留设研究

针对神南矿区张家峁煤矿常家沟水库周边4-2煤层大规模开采现状,将保护煤柱从防隔水功能上沿宽度方向划分为矿压影响区和有效隔水区。分别对矿压影响区宽度和有效隔水区宽度进行现场实测和理论计算,得出张家峁煤矿常家沟水库周边4-2煤层开采保护煤柱合理宽度为25 m。     

浅埋煤层开采水库周边保护煤柱合理留设研究

针对神南矿区张家峁煤矿常家沟水库周边5-2煤层大规模开采现状,在考虑保护煤柱稳定性影响因素的基础上,将保护煤柱从防隔水功能上沿宽度方向划分为矿压影响区和有效隔水区,分别对矿压影响区宽度和有效隔水区宽度进行了理论分析,推导出相应的计算公式。计算得出张家峁煤矿常家沟水库周边5-2煤层开采保护煤柱合理宽度为77m。     

丹巴燕子沟金矿开发对区域水环境的影响

四川丹巴燕子沟金矿位于川西高原,地处大渡河上游的自然保护区,生态环境脆弱。通过对区域地表水和地下水的环境质量评价,分析了矿山开发对区域水环境的影响。根据水文地质条件,从环境保护角度,对四川丹巴燕子沟金矿开发提出了防污建议,如矿硐的底部应和硐口外的废石堆场设集水沟渠,加强尾矿库的管理,定期监测矿山地表水和地下水的的水量和水质等,以利于资源和环境的可持续发展。     

金厂沟一带成矿地质条件与找矿方向

集安市金厂沟位于鸭绿江多金属成矿带东段,区内构造发育,岩浆岩广布,成矿地质条件十分优越。复兴屯铜金矿属斑岩型矿床;西岔-金厂沟金矿产于深穿透性构造控制的斑岩体边部,属斑岩-热液脉型金矿;正岔铅锌矿产于中生代斑岩体与早元古宙地层的外接触带,属热液矽卡岩型多金属矿。根据区域成矿规律、控矿地质条件及隐伏矿体的发现,证实该区具备中深部、周边部及多金属的找矿潜力,展示出了良好的找矿前景。     

浅埋煤层群水库周边开采保护煤柱留设研究

针对神南矿区张家峁煤矿常家沟水库周边浅埋煤层群开采现状,将保护煤柱沿宽度方向划分为矿压影响区和有效隔水区,并提出对煤层群中的上煤层开采,矿压影响区采动对煤柱破坏和影响而形成的屈服区宽度,对于煤层群中的下煤层开采,煤柱留设的原则是保证上煤层的保护煤柱不受采动影响。     

某稀土矿山辐射环境调查分析

通过对我国南方某离子型稀土矿山大气的X-γ辐射剂量率、Rn-222及其子体监测,地表水、地下水、土壤、生物样和地表水底泥取样放射性核素分析,调查和了解了该稀土矿山的辐射环境现状。监测结果表明该稀土矿开采对矿区内水库、地下水、土壤和水库底泥造成了一定放射性影响,其中矿区水库Th-232、总α和总β超过对照点较多,矿区内堆浸渣场、水冶车间、地浸采场及其周边地下水和土壤中U-235、Ra-226、Th-232、总α和总β略高于对照点,矿区内生物样和矿区附近其他地表水底泥未见明显的放射性影响。稀土浸出母液中有Rn-222及其子体释放,母液导流沟附近氡子体浓度略超过环境本底值,随着大气扩散、稀释作用,其它监测点的氡子体浓度均在本底值范围之内。有关部门应加强稀土开采监管,避免稀土开采对环境造成辐射影响。     

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     

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.