巴西将开采伊塔塔艾亚含铀磷酸盐矿床

巴西国营石油化肥公司已与米尔德·凯塞·恩格海里桑公司签订合同,就建立大规模生产黄饼和磷酸的工厂开展可行性研究。伊塔塔艾亚矿床为P_2O_5与U_3O_8共生矿床。计划建立一个年产700吨U_3O_8与10.5万吨     

世界矿业新闻

巴西从伊塔塔伊亚磷酸盐矿床中提取U_3O_8伊塔塔伊亚矿床位于西阿拉州东北部,离州府福塔莱萨约240公里,矿石中含U_3O_8。巴西国营石化公司已委托米尔德·凯泽工程公司就开发该矿床建厂生产黄饼进行可行性研究。计划建立一年产P_2O_510.5万吨和U_3O_8700吨的工厂,估计投资为2亿美元。该矿床于1975年发现,由各式的矿体群组成,但全系隐晶型羟基磷灰石。P_2O_5的总量为1800万吨,U_3O_8的总量为14.25万吨。此外,巴西的巴伊亚州另有一铀矿床,铀的含量达2500PPm,U_3O_8的总量约93100吨,此矿床的深部仍有待判明,矿量可能会增加。     

同位素稀释质谱法测定U_3O_8中痕量Sm、Eu和Gd的改进

试样用HCl溶解,以201×7型阴离子交换树脂除去大量U,用P507萃淋树脂将Sm、Eu和Gd与其他稀土元素分离。以~(147)Sm、~(151)Eu和~(160)Gd作稀释剂,用同位索稀释质谱法分析含Sm、Eu、Gd分别为0.0522、0.0524和0.0609ppm的U_3O_8试样时,精密度分别为±1.2％、±2.0％和±2.7％。本文还试验了无液N_2质谱分析,获得满意的结果。     

火焰原子吸收光谱法测定U_3O_8产品中钾钠含量的不确定度评定

用火焰原子吸收光谱法测量U_3O_8中钾钠的含量,并对测量结果的不确定度进行了分析评定。主要对样品称量、定容体积、标准溶液、测量结果重复性、工作曲线、树脂吸附等引入的不确定度进行了分析评定,经测定,每克U_3O_8中钾含量为(16.26±0.84)μg,钠含量为(16.93±0.80)μg。     

U_3O_8中铁、镍等九个元素的光谱测定

U_3O_8产品的纯度分析主要采用化学光谱法和载带光谱法。本文在文献的基础上,选用较大的称样量,将AgCl复盖在样品表面,不经研磨,并改变其它原有条件,直接摄谱测定了U_3O_8中的Fe、Ni、W、Mo、Cr、V、Cu、Mn、Al九个元素。     

1991年铀综述

在稳定美元期间,1991年的铀价再一次下跌,可能达到15年来的最低值。目前每磅U_3O_8的价格在10美元以下。最近铀价看好很可能是政治原因而不是供需关系有什么变化。1991年世界铀产量下降到94.7百万磅U_3O_8。主要原因是主要生产国的产量减少。现在每年 U_3O_8消耗量约150百万磅,库存约250百万磅 U_3O_8,供过于求的形势预计将延续到1995年末。     

方波悬汞催化伏安法连续测定U3O8中的Mo和W

用极谱法连续测定Mo和W的报道较少,用方波伏安法连续测定U_3O_8中Mo和W至今尚未见到报道,U_3O_8试样中Mo和W含量的比例有时高达100多倍,W的含量又很低,因此用一般的极谱法连续测定有困难。本文研究了硫酸-氯酸钾-苦杏仁酸-二苯胍体系中Mo和w的方波悬汞催化伏安连续测定方法。主体元素铀采用TBP萃淋树脂分离除去,在选定的条件     

1992年铀综述

由于美国贸易部采用了双重价格体系,致使1992年的世界铀市场更加复杂化。美国政府的这一举措严格地限制了独联体将铀输入美国。因此限制以后的美国市场铀价略有回升,每公斤U_3O_8的价格为22.05美元,而在美国以外市场U_3O_8的价格则低于17.64美元/磅。     

要重视含铀磷块岩资源的研究与开发

<正> 一、前言近年来世界核电站不断增多,铀的需要量急剧增加。据美国《铀矿资源》报导:1970年铀的需要量为1.09万吨U_3O_8,又据经济合作与开发组织报导:1980年铀需要量为2.8—3.2万吨U_3O_8,十年增长了两倍左右。在这种形势下,高品位铀矿石因大量开采而日趋减少,处理低品位铀矿又使生产费用增高。1970年资本主义国家铀矿资源的     

会议消息报道

核工业部U_3O_8标样定值工作会议,在部生产技术司、科技局、核燃料局、矿冶局主持下,于1987年9月6日至13日在安徽省屯溪市召开,来自原子能研究院、北京第五研究所、国营272厂等院、所、厂以及清华大学核能所共16个单位,72名代表参加了会议。与会代表对U_3O_8标样的制备及定值技术报告进行了讨论,对大会交流的12个分析方法进行了评议。代表们同意该U_3O_8标样采用国际原子能机构SR-64标样的数据处理方法——即中位值方法进     

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     

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     

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     

唐口煤矿深部复杂开采工作面瓦斯分源涌出规律研究

研究工作面瓦斯涌出规律对工作面瓦斯治理有重要意义。为了得到唐口煤矿深部3号煤层复杂开采条件下工作面回采时期瓦斯涌出时空演化规律,选取6304工作面作为对象,采用实测方法研究6304工作面瓦斯涌出规律。结果表明:6304工作面瓦斯涌出量为6.534 m³/min,其中煤壁占34.27%,落煤占29.62%,采空区占36.11%;沿工作面倾向由低到高,瓦斯浓度整体为上升趋势,其中1—76号架工作面瓦斯浓度小于0.20%,76—102号架瓦斯浓度上升明显,最大为0.387%;上隅角的后部采空区是工作面的瓦斯主要涌出源,上隅角1号测点瓦斯浓度0.78%,上隅角周边3号、5号、7号、8号、9号测点瓦斯浓度平均为0.643%;周期来压时,上隅角瓦斯相对平时较高。研究为针对性的瓦斯分源监控与灾害防治提供基础。