EG-ZnCl2-MgCl2离子液体中电沉积Zn-Mg合金的研究

采用循环伏安法研究了EG-Zn Cl2-Mg Cl2和EG-Zn Cl2-Mg Cl2-Na OH体系的电化学行为。结果表明,锌先于镁发生电沉积,添加剂Na OH的加入能够促进镁的电沉积。此外,Zn-Mg合金沉积接近一个不可逆的过程,其氧化峰面积远小于还原峰面积。用2.5 V的槽电压于353 K在纯铜片上进行电沉积,在EG-Zn Cl2-Mg Cl2-Na OH体系成功电沉积Zn-Mg合金。Zn-Mg合金镀层的光电子能谱分析表明,镁以Mg和Mg O的形式存在,Mg O的出现是表层镁被空气氧化所致;锌以单质的形式存在。XRD分析结果表明,沉积的合金为Zn-Mg固溶体。     

某高镁低品位软锰矿锰镁分离试验

高镁低品位软锰矿石传统的锰镁分离工艺均存在污染严重、锰镁离子分离效率低等问题。为了实现高镁低品位软锰矿的高效、低污染开发利用,以广西某高镁低品位软锰矿为原料,对采用酸化还原焙烧+尾气(SO2)还原软锰矿矿浆—还原产物合并浸出—浸出液除杂工艺制得的高纯Mn SO4与Mg SO4混合溶液,进行了NH4HCO3沉Mn2+(锰镁高效分离)工艺条件研究。结果表明,在NH4HCO3与Mn SO4物质的量之比为2.25,反应时间为60 min,反应温度为30℃,搅拌速度为120 r/min情况下,锰镁分离率可达96.96%。该锰镁分离工艺既解决了酸化还原焙烧尾气(SO2)的高效回收利用问题,又高效地实现了浸出液中锰镁离子的分离。     

LiCl-KCl熔盐中电解La_(2)O_(3)-NiO制备LaNi_(5)合金北大核心

以LiCl-KCl熔盐为电解质,采用熔盐电脱氧法直接还原La_(2)O_(3)-NiO制备LaNi_(5)合金,研究电解时间对电脱氧还原制备LaNi_(5)合金的影响,探讨了在熔盐中金属氧化物电脱氧的机理。结果表明,在650℃、3.5 V槽电压下,经过10 h电解可制备LaNi_(5)合金;金属氧化物电解还原历程为:NiO优先还原为金属Ni,其次是LaNiO_(x)中La部分得到还原,并与先还原的金属Ni合金化形成LaNi_(5)合金,而金属氧化物生成较稳定的LaNiO_(x)中间产物,最后金属氧化物LaNiO_(x)进一步还原并与先还原的金属镍合金化生成LaNi_(5)合金。     

用金电极对含高氯化钙镁电解质中铁(Ⅱ)的循环伏安法研究

用金电极对含高氯化钙镁电解质(MgCl_2:CaCl_2:NaCl:KCl=13:41:41:5重量)中Fe(Ⅱ)在700℃下的还原过程进行了循环伏安研完。证明Fe(Ⅱ)的还原过程为扩散控制的简单双电子转移的金属电沉积过程。测得Fe(Ⅱ)的扩散系数为2.67×10~(-5)cm~2·S~(-1)。     

硫酸盐水溶液电积镍的反应机理

本文用动电位扫描技术研究了硫酸盐水溶液电积镍的反应机理。在pH5.2的硫酸盐水溶液中,Ni(Ⅱ)离子放电还原为电荷传递分步进行的不可逆电极过程,其中第一个电子传递的电化学反应为控制步骤。S0_4~(2-)和H~+离子均不参加电化学反应。     

溶液浓度对锌电沉积参数的影响研究

研究了锌电沉积过程中溶液中锌离子浓度和硫酸浓度对电积液密度、导电率、槽电压以及电沉积电流效率的影响。结果表明, 电流效率随着溶液中锌含量增大和溶液中硫酸含量的减小而增大。通过回归分析, 得到了溶液浓度与锌电沉积参数关系的回归方程, 并得出了锌电沉积的最优化条件。     

表面活性剂对电解锌粉形貌的影响

研究氯化铵体系电解制备超细锌粉时,三种典型的表面活性剂对槽电压,锌粉沉积状态和锌粉颗粒大小和形态的影响.结果表明,在锌离子浓度为32g/L.电解液温度为60℃时,非离子表面活性剂吐温-80可以使锌粉颗粒均匀分散,表面活性剂的加入对槽电压影响不大.     

碱熔氨浸联合法从硼泥中提取氢氧化镁

为实现硼泥中镁元素的资源化利用,采用碱熔氨浸联合法从硼泥中提取Mg(OH)2。研究了不同的氢氧化钠与硼泥质量比,焙烧时间与焙烧温度对镁转化率的影响,不同氯化铵用量、浸出时间和浸出温度对镁溶出率的影响,不同氨水用量对镁离子沉淀率的影响。结果表明:当氢氧化钠与硼泥质量比为3∶1,在340℃条件下焙烧30 min时,硼泥中镁的转化率达到96%;镁的溶出率随氯化铵用量的增加、浸出温度的升高和浸出时间的延长而增加;镁离子的沉淀率随氨水用量的增加先增加后减少。     

镁离子对钼尾矿中石英和长石浮选分离的影响研究

为了回收内蒙古某钼尾矿中含量约35%的长石以及含量约35%的石英,进行了油酸钠在镁离子存在的条件下对石英和长石浮选分离的研究。通过对浮选条件的优化,在pH=11.0、镁离子用量300 g/t、油酸钠用量900 g/t的条件下,获得了产率为27.28%、SiO₂含量为94.67%的石英产品以及产率为36.47%、K₂O+Na₂O含量11.13%的长石产品。通过Zeta电位测试及镁离子的溶液化学分析表明,矿浆pH值为11.0时,Mg（OH）+的浓度较大,Mg（OH）₂沉淀刚开始生成,此时活化石英的效果最为明显,即浮选精选产率较大,且浮选精矿中长石浮选回收率较低;当矿浆pH值大于11.0时,在矿物表面生成越来越多的Mg（OH）₂沉淀可能使药剂失去选择性,从而导致大量长石开始上浮。镁离子对石英的活化作用有利于石英和长石的浮选分离。      

重庆隘口白云石矿硅热法炼镁试验

重庆秀山县隘口白云石矿Mg O品位20.88%,主要呈细晶结构,主要矿物为白云石,是优质的炼镁原料。为合理开发利用该资源,采用硅热法进行炼镁试验。结果表明:在煅烧粒度0.25~3 mm(需水洗)、煅烧时间60 min、煅烧温度1 080℃,可获得水化活性度35.32%、灼减0.32%的合格煅白;在炉料配硅比M=1.2、w(煅白)∶w(硅铁)∶w(萤石)=79.44∶17.57∶2.99、制球压强332~346 MPa,还原温度1 170℃、还原时间120 min、还原真空度5.2~7.2 Pa的条件下进行真空还原镁试验,可获得白云石镁还原率95.27%、硅利用率79.62%、粗镁纯度99.641%良好指标,为进一精炼镁提供了基础。     

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。