5Cu/(10NiO-NiFe2O4)金属陶瓷惰性阳极钠钾混合电解质电解腐蚀研究

采用传统粉末冶金技术制备了铝电解用5Cu/(NiFe2O4-10NiO)金属陶瓷惰性阳极,对其在钠钾冰晶石混合冰晶石中进行电解腐蚀。研究结果表明,从微观来看,阳极存在腐蚀现象。电解过程的槽电压波动剧烈。Fe、Ni和Cu组元的平衡浓度分别为150×10-6、42×10-6及40×10-6,腐蚀速率比常规电解条件下的低。     

低温电解质熔体中NiFe_2O_4基惰性阳极电解腐蚀初探

通过电解前后阳极的外观形貌、微观形貌及槽电压,研究不同槽型对电解腐蚀的影响,并以优化后的电解槽研究5Cu/(NiFe2O4-10NiO)金属陶瓷惰性阳极在Na3AlF6-K3AlF6-AlF3-Al2O3电解质中的电解腐蚀。结果表明:电解后阳极存在一定程度的腐蚀,且少量电解质已渗透到阳极中。     

5Cu/(NiFe2O4-10NiO)金属陶瓷惰性阳极低温电解腐蚀研究

采用等静压工艺来制备5Cu/(NiFe2O4-10NiO)金属陶瓷惰性阳极。通过电解后阳极的宏观形貌、微观形貌以及槽电压研究金属陶瓷惰性阳极的抗腐蚀性能。结果表明,电解后虽然阳极外观保持完好,但内部已存在金属相的腐蚀。     

金相组织结构对Pb-Ag-RE合金阳极电化学行为的影响

正采用循环伏安法,计时电位法,Tafel测试对比研究了三种具有不同金相组织结构的Pb-Ag-RE阳极的析氧行为。金相组织中不同相的含量和分布影响阳极氧化成膜,进而影响阳极电化学行为。铅基合金阳极广泛地应用于有色金属提取冶金,如Zn,Cu,Co,Mn,Ni等的湿法电沉积。目前,国内外研究者主要通过优化合金成分和机械加工方式来改善铅基合金阳极耐腐蚀性能、析氧活性和使用寿命。本质上,优化合金成分和机械加工都是通过改变     

NiFe2O4-NiO复合陶瓷的熔盐腐蚀行为

采用气氛烧结技术制备NiFe2O4-xNiO复合陶瓷材料(x为复合陶瓷中NiO的质量分数,％.x-0、5、10、17、25),并以该材料作阳极进行960℃的铝电解实验.分析烧结体的显微结构和物相组成以及电解试样的表层形貌与成分,研究NiO的添加对NiFe2O4陶瓷烧结性能和电解腐蚀性能的影响,并对该材料的烧结机制和熔盐腐蚀行为进行探讨.结果表明:氮气气氛下1 300℃烧结的NiFe2O4-NiO复合陶瓷存在NiO和NiFe2O4两种物相,NiO相含量高于理论值;NiFe2O4陶瓷的相对密度为98.54％,添加NiO后复合陶瓷材料的相对密度有所下降,但仍保持在95％以上;电解过程中阳极表面形成不含NiO相的致密保护层,阻止电解质熔盐的渗透;保护层厚50～80 μm,为含Al的尖晶石NiFe2O4相;随着NiO含量增加,阳极表面的致密层变得越发不平整.     

添加稀土元素对锌电解阳极合金耐腐蚀性能的影响

研究了稀土元素对Pb-Ag二元合金的组织结构及性能的影响。添加稀土元素后,粗大枝晶转变为细小等轴晶,晶粒细化;添加稀土元素后阳极合金腐蚀率明显降低,较未添加稀土元素Pb-Ag阳极合金腐蚀率降低22.12%,Pb-Ag合金阳极腐蚀产物较致密,没有明显的孔洞,有效的保护阳极基体,提高了合金阳极耐腐蚀性能。未添加稀土元素Pb-Ag合金阳极腐蚀产物连接成团,有结壳趋势,可能导致阳极泥结块,将引起电解槽压升高;添加稀土元素Pb-Ag合金阳极腐蚀产物表面有絮状腐蚀物存在,不会导致阳极泥结块结壳,保证电解槽压稳定。     

使用陶瓷惰性阳极的高纯铝的电解生产

本发明公开一种在包括陶瓷惰性阳极的电解还原槽中生产工业纯铝的方法。该方法生产具有可接受水平的Fe，Cu和Ni杂质的铝。在该方法中使用的陶瓷惰性阳极可以包括含Fe和Ni的氧化物，以及其他氧化物，金属和／或掺杂剂。     

退火对MgO/NiFe/MgO多层膜平面霍尔效应的影响

采用磁控溅射的方法制备了结构为Ta(5 nm)/Mg O(6 nm)/Ni Fe(t_(NiFe))/Mg O(4 nm)/Ta(3 nm)的磁性多层膜,Ni Fe的厚度t_(NiFe)从5 nm增加到100 nm,之后在真空退火炉中经过400℃,1 h的退火处理并且进行随炉冷却,整个过程中沿着薄膜易轴方向施加大约4378 A·m-1的磁场。采用四探针的方法来测量平面霍尔电压(PHE)和相对电阻变化率,通过X射线衍射(XRD)和高分辨透射电子显微镜(HRTEM)来分析多层膜退火前后的微结构变化。研究结果表明:对于制备态和退火态的Ta/Mg O/Ni Fe/Mg O/Ta纳米磁性多层膜结构,当t_(NiFe)40 nm时,霍尔输出电压骤减,随着t_(NiFe)的继续增加,霍尔电压基本保持不变。然而,所有的制备态同一厚度的样品经过退火处理之后,霍尔电压都有一定程度的提高,当t_(NiFe)=5 nm时,平面霍尔输出电压增加最大。随着Ni Fe厚度的继续增加,退火处理所导致的输出电压的提高幅度逐渐减小,当t_(NiFe)=100 nm时,霍尔电压退火之后几乎保持不变。不同Ni Fe厚度的样品,霍尔电压经退火处理后之所以提高幅度不同,主要与两个因素有关,一是Mg O/Ni Fe异质界面会增强电子自旋相关散射提高PHE输出电压,二是Ni Fe层因分流也会导致PHE输出电压下降。     

海洋结核矿电解氯化回收铜,镍,钴 上

利用海水中极易获得的氯化钠,处理海洋结核矿使人们联想到开发电解氯化法的可能性。海洋结核矿这类复合氧化矿物的电解氯化是比较困难的。阳极极化研究表明通过向矿物中加入硫化钠可使电解过程变得容易。氯化铵体系在隔膜槽电解氯化的实验证实了硫化钠添加剂是有益处的,并取得满意的金属回收率。实验研究发现:加入40％的硫化钠,槽电压7.5V,电解海洋结核4h,金属回收率Cu95％、Ni81％、Co82％。不加硫化钠时,金属的回收率仅为Cu40％、Ni31％、Co14％.Nacl体系在最佳条件下,也可获得Cu88％、Ni85％和Co88％的金属回收率。同时还研究了添加硫化钠时,电解氯化锰结核矿和各种可能的反应机理和金属溶解行为。     

旋流电解提取铜冶炼污泥模拟浸出液中有价金属研究

配制模拟铜冶炼污泥的硫酸浸出液作为电解原液,考察了旋流电解技术分离提取溶液中Cu,Zn,Ni 3种有价金属的效果。结果表明,旋流电解可以实现3种有价金属的分步电解分离,实验中直接获得了电解铜和电解锌产品。对于Cu,Zn,Ni混合溶液的旋流电解过程,Cu优先在阴极电解,电解铜产品以铜粉为主,另含有少量的铜片;电流密度越大,Cu的沉积速度越快,在电流密度为0.04 A·cm-2时,30 min内Cu的回收率达到54.4%;由于Cu的电阻率较低,因此其在阴极上的沉积可以提高系统的导电性,从而使槽电压下降,降低能耗。对于Zn,Ni混合溶液的旋流电解过程,Zn优先于Ni电解,在阴极得到形貌较好的Zn板;槽电压随运行时间下降较电解铜时更加缓慢,30 min内仅下降9.1%;电解产品上部有Ni沉积,且表面由于氢的析出产生类似月球表面环形山的椭圆坑;旋流电解槽内部的旋流流态加之镍的特殊超电势使得Zn优先于Ni电解。     

Chinalco Signed Framework Agreement for Strategic Cooperation with Harbin Municipal Government

正Last month,Chinalco signed framework agreement for strategic cooperation with Harbin Municipal Government in Harbin Xiong Weiping,Chairman of Chinalco,said that based on the strategic deployment to build world top-class mining company with the highest growth potential,Chinalco was now concentrating all efforts on making strategic transition and structural adjustment,strategic cooperation with the local governments where     

Jiangxi Promotes Jiangxi Copper Corporation To Become The World's Most Competitive Mining Company

<正>According to the latest info from Jiangxi Province State-owned Assets Supervision and Administration Commission,Jiangxi Copper Corporation was approved to become the first pilot enterprise for deepening reform.Contents of the pilot work is"Three Self"(self expansion,self decision-making,self     

Journal of Rare Earths Contents List of Vol.32(2014)

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Contributions to Baosteel Technical Research wanted

正Baosteel Technical Research,a quarterly journal,which is issued domestically and abroad,is run and sponsored by Baosteel Group Corporation.Baosteel Technical Research mainly reports the achievements in technological innovation,academic research,new product development and industrial equipment improvement by Baosteel.It will continue to follow up on hot topics and serve the company’s technological development and progress.Its readers include experts in     

Ministry of Industry and Information Technology: No Short Term Solution For Our Country’s Excess Nonferrous Metal Smelting Capacity

【正】According to the Ministry of Industry and Information Technology,the Ministry has released the 2013 Operation Report on China’s Industrial Communication Indu...     

Chinalco Signed Framework Agreement for Strategic Cooperation with Gansu Province

正Recently,Chinalco and Gansu Provincial People’s Government signed"Framework Agreement for Strategic Cooperation on Reform,Restructuring and Transition Development of Chinalco’s Electrolytic Aluminum Enterprises in Gansu",signifying that the strategic cooperation between Chinalco and Gansu Province had made new substantive progress.     

Unavoidable Economic Cycle:30% Of Nonferrous Metal Companies Were Involved In Restructuring

正Owing to continual downturn in real estate and bulk commodity markets,a number of traditional industries in China suffered unfavorable impact in performance.With the progressive disclosure of third quarter report,the no-pleasant-surprise performance of     

Baotou Rare Earth Became the World's Biggest High Performance Magnetic Material Base

正The High Performance Magnetic Material Phase II Project,an industry upgrading project implemented by Inner Mongolia Baotou IronSteel Rare Earth(Group)Hi-tech Co.,Ltd,recently basically finished equipment commissioning,signifying that the enterprise had developed the production capacity of15000 t/a Nd-Fe-B strip casting alloy and 5000t/a Nd-Fe-B magnet,thus becoming the world’s     

Introducing Two Central Enterprises to Integrate Rare Earth Industry,Shandong Rare Earth Group Breaks Surface

正With the signing of"Letter of intention for Propelling Integration of Shandong Rare Earth Enterprises"between Shandong Province Commission Of Economy and Informatization,China IronSteel Research Institute Group("China Steel Institute"),and China Rare MetalsRare Earth Co.,Ltd("China Rare Earth"),the"Shandong Rare Earth Group"jointly set up by the 3 units thus broke surface.On August 9,reporters of the China Economic Herald learned from Shandong Province     

Aluminium Production by Province or City in 2014

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