单扫示波极谱法测定锑精矿中痕量硒的研究

拟订出以砷作载体、共沉淀法分离富集，单扫示波催化极谱法测定锑精矿中痕量硒的方法。试验了影响测定的主要因素．在优化的条件下，方法可满足锑精矿中含硒在0．00005％以上的分析要求。对于含硒0.00481％的锑精矿11次测定，相对标准偏差RSD为4．2％，样品加标回收率在94％～106％。方法准确灵敏，操作简单．4～6h即可完成，与采用国际分析方法(GB/T)的结果一致，同时还避免了使用有毒的有机试剂．使方法更具实用性和推广价值。     

单扫示波极谱法测定锑精矿中痕量硒的研究

拟订出以砷作载体、共沉淀法分离富集,单扫示波催化极谱法测定锑精矿中痕量硒的方法。试验了影响测定的主要因素,在优化的条件下,方法可满足锑精矿中含硒在0 00005%以上的分析要求。对于含硒0 00481%的锑精矿11次测定,相对标准偏差RSD为4 2%,样品加标回收率在94%～106%。方法准确灵敏,操作简单,4～6h即可完成,与采用国际分析方法(GB/T)的结果一致,同时还避免了使用有毒的有机试剂,使方法更具实用性和推广价值。     

单扫示波极谱法直接测定CNI合金中的铟

研究在盐酸羟胺底液中，用单扫示波极谱法测定CNI合金中的铟。结果表明，无需分离基体，单扫示波极谱法可用于CNI合金中铟的直接测定。测定的线性范围为O．00～50．00μg／mL，检出限为O．002μg／mL，对含铟4．68％的CNI合金，测定RSD小于3．2％，加标回收率为96％～102％。方法准确、灵敏、线性范围宽，操作简便。     

示波极谱法测定低含量锌的不确定度评定

为了确保示波极谱法测量有色矿石中低含量锌的精确度,依据国家计量技术规范的要求,对整个测量过程中不确定度的来源进行了分析。分析结果显示,采用极谱法测定低含量锌的不确定度的最主要来源为测量的重复性和试样称量。因此,需强化分析化验人员的规范操作,以保证测量结果的精确度。     

示波极谱法测定混合稀土氧化物中铕

本文详细研究了在ＨＣｌ废液用示波极谱法测定混合稀土氧化物中铕的实验条件，拟定了一个简单实用的分析步骤．经过用于大量试样的分析，证明结果稳定，与光谱法对照也一致．     

进口锌精矿加工费下调

近期国内铅锌精矿中，品位在48％～53％的锌精矿加工费保持在6000-7500元／t，而进口锌精矿加工费出现了一定幅度的下跌，报价在210～230美元／t。几大进口贸易商均反映，目前进口锌精矿现货供应偏紧，仅维持长单供应量。     

湖南某大型铅锌矿选矿厂设计

为高效开发利用湖南某低品位大型铅锌矿资源,在进行了工艺矿物学研究的基础上开展了选矿工艺研究和选矿厂设计.试验确定采用两段锤破、一段磨矿、1粗4精2扫浮铅、1粗3精2扫浮锌流程,设计铅精矿铅品位为50.00％、回收率为85.00％,锌精矿锌品位为50.00％、回收率为91.00％;铅、锌精矿采用浓缩+过滤的两段脱水工艺,...     

交流示波极谱滴定法测定岩矿中的钍

在ｐＨ１—２的盐酸溶液中，用标准ＣｕＳＯ４溶液返滴法测定Ｔｈ，以ＣＵ２＋在交流示波极谱曲线ｄＥ／ｄｔ＝ｆ（Ｅ）上出现切口直接指示终点。Ｔｈ量分析范围为１．００—２０．００ｍｇ，方法回收率为９９．０％－１００．３％。对于含Ｔｈ０．６５％以上的试样分析１０次的相对标准偏差为０．１５％－１．５５％。     

交流示波极谱滴定铀的研究

在pH5的六次甲基四胺缓冲溶液中，用标准Zn(Ac)2溶液反滴法测定U以Zn^2在交流示波极谱曲线dE/dt=f(E)上出现切口直接指示终点。U量分析范围为1．50－22．00mg。方法回收率为99．03％－100．87％。     

龙桥矿业铜硫分离工艺优化研究

龙桥矿业公司铜锌硫混合精矿因其中的锌矿物成分复杂,导致抑硫浮铜锌效果不理想,硫精矿含锌超标,销售困难.为解决该问题,进行了铜硫分离工艺优化研究,结果表明,混合精矿采用1粗2扫抑硫浮铜锌、铜锌混合粗精矿再磨至-325目90％的情况下2次精选,最终获得Cu品位为21.94％、Zn品位为17.82％、Cu回收率为81.48％...     

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。