非化学计量比Li1+xNi0.8Co0.2O2结构和性能研究

共沉淀法合成了层状Li1＋xNi0.8Co0．2O2（X=0和0．05），采用XRD和电化学方法对其进行了研究。与Li1＋xNi0.8Co0．2O2相比，Li1.05Ni0.8Co0.2O2有较高的放电容量和较差的循环性能。与Li1＋xNi0.8Co0．2O2放电容量微分曲线相似，Li1＋xNi0.8Co0．2O2在4．15V存在负峰，随着循环次数的增加，4．15V负峰峰位明显向左移。与Li1＋xNi0.8Co0．2O2放电容量微分曲线不同，层状结构Li1＋xNi0.8Co0．2O2的4．15V负峰峰高随循环次数的增加而增高，循环过程促进了Li1＋xNi0.8Co0．2O2结构转变。     

共沉淀法合成Li_(1-2x)Ni_xFePO_4正极材料的研究

利用共沉淀法合成了Ni^2＋掺杂量x=0．00,0．005,0．01和0．03的Li1-2xNixFePO4通过对合成材料的XRD、元素组成及其电化学性能研究表明,少量Ni^2＋的掺杂并未影响材料晶体结构,但对材料的电化学性能却有着非常积极的影响：0．1C放电时,掺杂量x=0．01样品的首次放电比容量可达143．2mA-h／g,20次循环后放电比容量为131．2mA·h／g,容量衰减仅为8．4％。分别从荷锂状态（Li1-2xNixFePO4）和缺锂状态（FePO4）两方面对Ni^2＋掺杂改性的原理进行了简单的探讨：材料处于荷锂状态时,Ni^2＋掺入形成的锂空位与镍取代有利于提高锂离子于晶体中的扩散速率以及材料的电子导电能力;材料处于缺锂状态时,Ni^2＋掺入使得材料形成了Fe^2＋／Fe^2＋共存的状态,从而提高了其电子导电能力。     

碱式硫酸镁晶须的制备研究

以煅烧菱镁矿获得的氧化镁为原料，研究水热合成方法制取碱式硫酸镁晶须的适宜工艺条件。通过控制氧化镁活性、初始反应浓度和反应过程的搅拌强度等参数，可制取碱式硫酸镁晶须。晶须直径〈1．0μm，长度为20—100μm，表面光滑、形貌笔直、纤细，可作为优质增强阻燃材料使用。     

焦炉煤气制取甲醇工艺探讨

以焦炉煤气为原料，压缩至2．1MPa后进入精脱硫装置，将气体中的总硫脱至0．1ppm以下。焦炉气中甲烷含量达22.4％，采用纯氧催化部分氧化转化工艺，将气体中甲烷及少量多碳烃转化为合成甲醇用的一氧化碳和氢；经压缩进入甲醇合成装置。甲醇合成采用5．3MP。低压合成技术，精馏采用3塔流程。     

多相氧化还原法制备钴酸锂前驱体的研究

通过多相氧化还原法制得钴酸锂前驱体。XRD分析表明:合成的前驱体具有钴酸锂的晶型特征,与标准钴酸锂XRD的特征峰完全一致;扫描电镜(SEM)分析结果表明:二次粒子非常均匀,分散状态良好。同时研究了反应温度、反应时间和Li+浓度等工艺条件对合成钴酸锂前驱体的影响,得出合成该前驱体的最佳条件为:反应温度75～85℃,反应时间6～8 h,Li+浓度20～30 g/L。此条件下,可以合成比表面积(BET)20～50 m2/g,粒径100 nm左右,Li、Co摩尔比为0.7～1.0的钴酸锂前驱体。     

合成环氧大豆油若干影响因素的研究

对硫酸铝催化法合成环氧大豆油若干影响因素进行了研究．实验确定的最佳投料比为：大豆油：双氧水（27％）；甲酸：硫酸铝；相转移催化剂=1：（0．8～1．0）：（0.13～0．15）：（0．075～0．085）：（0．001～0．0001）．环氧大豆油产品环氧值在8．0％左右，酸值为0．40～0．50mgKOH／g，色泽较浅。     

富锂锰基材料Li_(1.35)[Ni_(0.35)Mn_(0.65)]O_(2+y)的合成与电化学性能研究

将化学计量比的前驱体Ni0.35Mn0.65(OH)2与Li2CO3均匀混合,采用不同高温段温度合成Li1.35[Ni0.35Mn0.65]O2+y富锂锰基正极材料。对合成的材料进行表征,结果表明:所合成的Li1.35[Ni0.35Mn0.65]O2+y正极材料为均匀的类球形,单颗粒大小均匀;XRD图谱显示材料为层状的α-Na Fe O2结构。将材料组装成CR2016扣式电池,采用蓝电测试仪以12.5 m A/g的电流密度进行充放电测试,2.0~4.8 V之间,最高初始放电比容量为198.0 m Ah/g,首次放电效率为69.7%。     

不同制备方法对正极材料0.5Li_2MnO_3·0.5Li(Ni_(1/3)Co_(1/3)Mn_(1/3))O_2结构、形貌、电化学性能的影响

分别采用氢氧化物共沉淀、碳酸盐共沉淀、喷雾干燥的方法合成了层状α-Na Fe O2结构的富锂正极材料0.5Li2Mn O3·0.5Li(Ni1/3Co1/3Mn1/3)O2,通过X射线衍射分析(XRD)、扫描电子显微镜(SEM)和电化学性能测试对不同合成方法所得的样品进行了表征。实验结果表明:氢氧化物共沉淀合成的前驱体所制备的正极材料0.5Li2Mn O3·0.5Li(Ni1/3Co1/3Mn1/3)O2具有良好的电化学性能,0.05C倍率下首次放电容量可达247.1 m A·h/g,0.2C倍率条件下经过50次循环,容量保持率为98.7%。     

TiCl4水溶液强水解合成Li4Ti5O12的研究

在高LiOH浓度下,以TiCl4和LiOH.H2O为原料,水解并合成Ti(OH)62-,控制条件,让Li+嵌入Ti-O八面体中,直接合成了Li4Ti5O12前躯体。对粉体进行了DSC-TGA、XRD分析,结果表明,热处理温度和时间对合成材料的组成和性能影响较大,在700~800℃热处理前驱体即可得到纯尖晶石相Li4Ti5O12。SEM分析及电性能检测表明,经过800℃热处理6 h的样品结晶度好,颗粒分布较均匀,平均粒径约为1μm;在0.1 C充放电倍率下,首次可逆比容量达158.8 mA.h/g,11次循环后,仍有133.8 mA.h/g。     

葡萄牙锂辉石矿石的选矿研究

叙述了处理葡萄牙北部花岗岩中以细晶岩－伟晶岩矿脉形式存在的锂辉石矿石以获得锂精矿和长石精矿的研究结果。该矿床中氧化锂含量变化较大,分析结果Li2O介于0．9％和3．0％之间。矿石中还含有长石、石英和云母。用重介质选矿（HMS）和浮选进行了选别。对含－2．5％Li2O并经分级的给矿样品（4．75－2．0mm）进行了HMS试验,在沉物产品中获得了含－5％Li2O的玻璃级锂辉石。对300－75μm的脱泥给矿进行了浮选试验,然而,只有给矿Li2O含量超过1．5％才能获得商业品级的精矿。从含－2％Li2O的给矿获得了品位7．75％LiO2的精选精矿。从锂辉石尾矿中获得了氧化铝＞17％和碱金属氧化物＞6％（Na/K-4/3）且铁含量低的长石精矿。提出了两个选矿工艺：（1）用浮选处理,主要是为生产高品级锂辉石精矿,然后产出玻璃级长石精矿;（2）用HMS预选500μm以下粒级,其优点是需浮选加工的矿石量不到40％。因此可以获得不同品级的最终产品,高品级锂辉石精矿量的减小可由玻璃级锂辉石精矿数量的增加、总回收率的提高以及在矿泥中锂损失的减少得到补偿。     

Current situation and future trend of China rare earth luminescent materialindustry(continued)

<正>Developing ecological lighting source The world is facing the big problem of energy shortage today and the contradiction between economy development and environmental protection is worsened.Therefore,people are more likely to choose an ecological light source that is more energy efficient and environmental friendly.The choice provides great opportunity for the development of rare earth optical material industry in China.The concept of green lighting positions rare earth luminescent material as a leading player in illumination market.The light source of both rare earth luminescent lamp and LED lamp is ecological and energy saving.This is why     

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.     

Rare Earth Application in Steel in China

<正>China has rich rare earth resources.Output of rare earth and steel in China ranks the top first in the world.However,there is still certain distance between the steel produced in China and developed countries from the point of varieties and quality.China still has to import some types of steel.Improving the quality should be emphasiZed in future development of steel industry in China.Rare earth can be used to upgrade traditional steel     

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.     

稀散金属产业的观察与思考

分析了近年来国内外稀散金属产业的生产、应用、资源与市场状况.铟锡氧化物靶材、砷化镓晶片、锗红外材料、铼高温合金和硒在电解锰及玻璃的应用等已成为稀散金属的主要应用领域.稀散金属的产量快速增长达到历史高位而导致了市场的失衡.以GaInP_2/GaAs/Ge,CIGS和CdTe为代表的非硅系太阳能电池是稀散金属的新兴应用领域,将给稀散金属带来日益增长的需求.     

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     

Brief news

正Corun invested another 50 million yuan in power battery for HEV Hunan Corun announced on 27 June that they had signed the cooperation agreement to jointly built Corun(Shaoxing)Autos Power Battery System Co.,Ltd.in Shaoxing Binhai New City.According to the announcement,total registered     

铜熔炼中锍品位对杂质元素分配行为的影响

借助于多相、多成分系统中平衡计算的手段，开发出微量元素砷、锑、铋及伴生元素铅、锌等在铜熔炼中分配行为的计算机模型。利用该模型对铜熔炼过程进行计算机模拟，分析了冰铜品位对砷、锑、铋、铅和锌等杂质元素的分压、活度系数及它们在冰铜、炉渣和气相中分配率的影响，并讨论其热力学分析结果对生产实践的指导意义。     

New energy vehicle:an opportunity for rare earth magnets

<正>Extracted from Securities Guide 1.Popularity of new energy vehicles—an irresistible market trend1.1 Progress of new energy vehicles Chinese Premier Li Keqiang said recently on a visit to Xi'an BYD Autos that new energy vehicles,especially new energy bus,can lessen environment and noise pollution.He encouraged the use of new