镍基废合金膜电解法制备氯化镍溶液的研究

研究了以镍基废合金板为原料,电流密度、温度、阳极液和阴极液的酸度、阳极液中NaCl和Ni2+的浓度对电解制备氯化镍溶液的影响.在电流密度200 A/m2、阳极酸度0.5 mol/L、阴极酸度1.5 mol/L、循环量40 L/h、Ni2+浓度0.85 mol/L左右和室温的条件下电解,平均槽电压1.3 V,电溶1 t镍合金板耗电813 kW·h,阴离子交换膜对镍的截留率大于99.5%.     

铁基镍铬合金膜电解工艺的研究

在盐酸体系中采用膜电解电溶法处理含镍、铬的铁基高温合金。通过优化条件, 确定了膜电解过程的操作条件。研究结果表明, 在电压为1.5 V、平均电流密度为500 A/m²、Ni²⁺离子浓度为1 mol/L、阳极液酸度为1 mol/L、极距为20 mm、温度为35 ℃条件下电解, 电流效率可达90%以上, 能耗为1 200 kW·h/t左右。     

电解法从铅阳极泥提取铋的研究

从铅阳极泥中提取铋并富集金银等有价金属元素,对提高冶金二次资源的综合利用具有重要意义。将脱砷后铅阳极泥熔铸成粗铋作为BiCl3-HCl-NaCl电解体系的阳极,重点研究了温度、电流密度、酸度、Bi3+浓度、NaCl添加量对电解过程的影响。考察了电流效率、电能消耗及阴极产物纯度。结果表明,在电解液温度30℃、电流密度150A/m2、游离HCl浓度80g/L、Bi3+浓度120g/L、NaCl添加量80g/L条件下,得到了致密的薄板状阴极铋,电流效率达到98%,电能消耗约为136(kW·h)/tBi,阴极铋纯度达到99.8%。     

合金中铋银的电解分离行为及其影响机制

在HCl-NaCl-BiCl₃-H₂O体系下, 对铋银合金中铋、银进行了电解分离研究, 考察了温度、电流密度、Bi³⁺浓度、酸度、NaCl添加量等对铋、银分离效果的影响。采用金相显微镜观察了不同电流密度及Bi³⁺ 浓度下阴极铋的形貌。实验结果表明, 在温度40 ℃、电流密度150 A/m²、NaCl添加量80 g/L、HCl浓度60 g/L, Bi³⁺浓度80 g/L条件下, 铋在阴极呈致密片状析出与银实现分离, 其纯度达99.5%以上, 电流效率大于99%, 阴极铋电耗约180 kW·h/t。     

硫化钠溶液电解氧化产生多硫化物的研究

报道了直接电解硫化钠水溶液水产生多硫化物溶液的研究,电解槽采用阳离子隔膜分为阳极与阴极室,阳极液为Ｎａ２Ｓ水溶液,阴极液为ＮａＯＨ水溶液（１ｍｏｌ／ｄｍ＾３）分析了影响电解槽槽电压各成分的分布情况,结果表明,电解温度在６１℃时,槽电压可控制在０．９～１．２Ｖ之间,电流密度２０～３０ｍＡ／ｃｍ＾２之间,阳极过电位在０．４Ｖ以下,研究了电解温度,电解时间,硫化钠溶液浓度及电流密度对多硫化物生成效率的影     

废镍合金的电化学溶解研究

采用电化学溶解法对含Co、Cu、Fe 等杂质的废镍合金在硫酸中的溶解过程进行了研究。采用EDTA 络合滴定法分析和原子吸收分光光度法测定了溶液中镍及杂质金属离子的含量。研究了电流密度、硫酸浓度、电解液温度、电解时间及电解方式等对电化学溶解的影响。得到废镍合金电化学溶解的优化工艺条件为:阳极电流密度200 A/m²、硫酸浓度1.25 mol/L、温度40 ℃, 采用方波脉冲电流电解。稳定电化学溶解时的主要技术指标为:槽电压0.8～1.0 V, 电流效率90.8%, 每吨镍直流单耗为800～1015 kW·h 。     

从氯化铅水溶液中电解提取铅

研究氯化铅水溶液电解过程，考察阴极材质、电流密度、温度、Pb^2＋浓度、盐酸浓度、添加剂等因素对电流效率、槽压和沉积物质量的影响。结果表明，添加骨胶和β-萘酚对沉积物的质量和电流效率并没有太大改善。却导致槽压上升。因此，氯化铅水溶液电解中不必加入添加剂。采用不锈钢和铅阴极电解。在电流密度100A／m^2，温度55℃，Pb^2＋浓度30g／L，盐酸浓度6g／L的条件下。电流效率可达92％，阴极铅较致密平整，可直接用于铸锭。     

膜技术处理铜电解液最佳条件试验

通过实验研究了影响离子交换膜电解脱铜效率的各种因素, 包括电流密度、极距、阳极室内硫酸起始浓度、电解温度、脱铜程度, 确定了离子交换膜电解脱铜的最佳工艺条件为: 极距20 mm, 阳极室内硫酸浓度10 g/L, 电解温度45 ℃, 当铜离子浓度大于5 g/L时, 采用大电流密度(220 A/m²)电解, 当铜离子浓度小于5 g/L时, 采用小电流密度(160 A/m²)电解。     

螯合树脂TP207深度去除氯化钴溶液中的镍

研究了TP207树脂在氯化钴电解液中深度净化除镍工艺,考察了该树脂不同工艺条件下对镍的吸附性能。结果表明,随接触时间的增加、料液pH值减小和温度的升高,树脂对镍的交换容量增大,料液中Ni2+浓度对交换容量有影响。镍吸附最佳条件为：料液中Ni2+浓度0.05 g/L、接触时间40 min、pH值4、温度30 ℃;料液中Ni含量低于0.5 mg/L时达到深度除镍目的,满足制备5N5高纯钴产品溶液的要求,有助于实现湿法电解高纯金属的大规模工业化生产。     

从盐酸BiCl_3溶液中隔膜电积回收铋的研究

介绍了一种回收铋的清洁湿法冶金新工艺,运用隔膜电积法从盐酸BiCl3溶液中回收铋,并考察了电流密度、温度、HCl、Bi3+和NaOH的浓度对电积的影响。结果表明:在电流密度150 A/m2、温度45~55℃、3.5 mol/L HCl、110 g/L Bi3+、15 g/L NaOH的最佳条件下,阳极NaOH反应生成NaClO3,Bi3+在阴极上沉积得到致密金属铋,电流效率最高可达到98.82%,阴极铋纯度为99.80%。电积后将阳极和阴极电积液返回循环利用,实现了物料的闭路循环。     

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     

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     

2014 second batch of rare earth quota released

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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.