含Mn涂层钛阳极的制备及性能

采用热分解法制备了不同含锰涂层钛阳极,对比测试了不同含锰涂层钛阳极的性能。对所制备钛阳极涂层成分和形貌进行了X射线衍射(XRD)、扫描电子显微镜(SEM)检测分析。通过循环伏安曲线(CV)、极化曲线(LSV)和加速寿命实验(ALT)测试,探究了涂层钛阳极在硫酸溶液中的电化学行为。结果表明,不同元素组成的涂层钛阳极表面形貌具有明显的差异,Mn可以明显改善涂层的形貌结构和催化性能,提高涂层的耐腐蚀性。通过对比,Ti/IrO₂-RuO₂-MnO₂涂层阳极综合性能最好、强化电解寿命可达114 h,具有很好的吸氧催化活性和稳定性。     

酸性蚀刻废液再生用钛基电极的电催化与耐腐蚀性能

采用热分解法制备出二氧化铱涂层钛阳极.采用循环伏安曲线、强化腐蚀等方法对酸性蚀刻废液再生用二氧化铱涂层钛阳极的电催化性能、耐腐蚀性能进行研究;应用恒流腐蚀等方法对阴极钛片在盐酸介质中的耐腐蚀性能进行了测试.结果表明,在氧化还原电位为498mV的典型酸性蚀刻废液中,二氧化铱涂层钛阳极表面Cu+的起始氧化电位为0.441V(相对饱和甘汞电极);在HCl质量浓度2mol/L、Cu2+质量浓度20g/L的溶液中,在电流密度0.12A/cm2的条件下,阴极钛片的吸氢腐蚀增量为0.32mg/(cm2.d).     

二氧化锰涂层钛阳极的研制

本文研究了用热分解法制得MnO_2涂层钛阳极。大量的试验表明,采取涂敷中间层以及在涂层中添加活性元素两项措施,可有效地提高阳极的导电性能。X射线衍射分析表明,制得的二氧化锰为β-MnO_2,属四方晶系。通过热力学计算,在煅烧温度范围内,所添加活性元素仍以氧化物状态存在,因此催化作用强。工厂试验表明,所研制的Ti/MnO_2阳极,与传统的Pb-Ag阳极相比,槽电压可降低0.5V,节电16％。     

湿法冶金中钛基二氧化锰阳极的研究

研究了钛基二氧化锰阳极涂层的工艺条件．并对有关物理化学性能进行了测试．在钛基体和二氧化锰涂层之间涂覆Ｓｎ－Ｓｂ中间涂层能有效地降低槽电压和防止钛基体的钝化，解决了湿法冶金中应用该种阳极存在的难题．所研制的阳极在硫酸盐水溶液的电解过程中，具有优良的电化性能和耐腐蚀性能，降低能耗，提高了产品的纯度．这种阳极可望在锌、铜、镉、锰、镓、铟、钻、镍等金属的电积过程中得到应用．     

三阳极大气等离子喷涂Cr2O3涂层的研究

采用SEM及XRD方法对用三阳极等离子喷枪所制备的Cr2O3涂层的结构、相及基本的性能进行了表征.并与传统等离子喷涂所制备的Cr2O3涂层进行对比.结果表明,在显微结构和硬度方面三阳极等离子喷涂所制备的Cr2O3涂层与传统等离子喷涂所制备的相近,但结合强度比传统等离子喷涂的高48%.     

电解冶金中新型涂层钛阳极的研究和应用

电解冶金中，在氯倾物体系电积金属，主要研究涂层钛阳极钝化原因，并对阳极导电性能进行改进，取得节省电能消耗的效果，在硫酸盐体系电积金属，通过添加铱等活性元素，大幅度地提高了涂层钛阳极电催化活性及阳极工作寿命，快速寿命比Ｂ配方的增加２１２倍；在氯化物硫酸盐混合体系电积金属，研究了硫酸根含量对放氯效率的影响。本文研制的涂层钛阳极已在国内一些冶金厂应用。     

载银纳米铁酸铜抗菌剂的制备及抗菌性能

以纳米铁酸铜(CuFe_2O_4)复合氧化物为载体,通过吸附制备载银抗菌剂,用抑菌圈直径和杀菌率表征抗菌性能.选择pH值范围为5.5～7.0、吸附时间8h、吸附温度50℃为纳米CuFe_2O_4对银离子的吸附条件.当焙烧温度为500℃时Ag~+能够有效缓释,并具有抗菌持久性.具有相近粒径和相同载银量的载银纳米CuFe_2O_4抗菌能力强于载银纳米SiO_2.载银纳米CuFe_2O_4抗菌剂具有较好的抗菌性能.随着抗菌剂载银量的增加抗菌能力增强,抗菌剂的焙烧温度影响银离子的溶出能力与缓释能力.载体本身较强的吸附、催化能力产生的对细菌的破坏及其中铜元素的存在有利于增强抗菌剂抗菌性能.     

适于煤矿乏风催化燃烧的高性能催化剂制备方法实验研究

通过正交实验设计,改变负载贵金属焙烧温度、贵金属含量和铂钯质量比,采用浆料涂覆法和浸渍法制备了含有稀土元素涂层的铂、钯贵金属整体式催化剂。借助于BET和SEM分析方法对催化剂的物理化学性质进行了表征。在常压连续流动固定床反应器中,用乏风瓦斯系统地考察了上述3种制备条件下的催化剂性能,以及空速对催化剂性能的影响。实验结果表明,催化剂的最佳制备条件为:负载贵金属焙烧温度750℃,贵金属含量1.41 kg/m3,铂钯质量比6∶1。在空速为40 000 h-1、反应温度为450℃条件下,乏风中甲烷转化率可达98.9%。     

电解法制备四甲基氢氧化铵的研究

在以四甲基氯化铵为原料,涂层钛阳极为阳极,不锈钢作阴极,Nafion 900阳离子膜为电解隔膜的条件下,通过电解制备了四甲基氢氧化铵,并研究了电流密度、原料浓度、电解温度等因素对产物纯度和电流效率的影响,以及电解液循环速率对钛阳极使用寿命的影响.实验结果表明,电流密度和电解液循环速率是影响电流效率的主要因素,而电解温度对产物纯度的影响最大,电解液的循环速率对钛阳极使用寿命的影响较大.用该工艺制备四甲基氢氧化铵,电流效率可达74.7,,产品中Cl-质量分数低于0.01,.     

硫酸盐体系电积金属镍中活性涂层钛阳极的研制

本文研制了一种新型活性涂层钛阳极,在硫酸盐体系电积金属镍中,与通常使用的铅银阳极相比,具有较低的槽电压和电能消耗,每生产1t 镍可节省电能485.72kW·h 左右。新型阳极运转寿命长,在工作电流密度700A/m~2下),连续运转24 264 h.电化学研究表明,所研制的阳极对析氧反应具有很高的电催化活性,交换电流密度 i°值为23.44×10~(-5)A/cm~2,比铅银阳极的高两个数量级.对活性涂层钛阳极失效原因进行了分析.     

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。