锡深加工及锡粉制备

介绍了我国锡资源及其深加工现状。综述了普通锡粉、超细锡粉和纳米锡粉的制备方法。     

安徽某地铜尾矿资源的综合利用研究

介绍了我国铜尾矿的排放和利用现状,并利用安徽某地铜尾矿分别制备45μm孔筛筛余小于30%的普通铜尾矿粉、中位粒径小于10μm的超细铜尾矿粉及超细铜尾矿粉-超细矿渣粉复合超细粉,研究其粒度分布、活性指数和流动度比以及作为水泥混合材在水泥中应用性能。结果表明：将铜尾矿粉超细粉磨后活性指数和在水泥中应用性能显著提升;超细铜尾矿粉与超细矿渣粉按照5:5复配后可接近S95级矿渣粉技术指标,用于替代矿渣粉作水泥混合材,可降低水泥生产成本。     

基于高压水射流的超细煤粉制备技术及其影响因素研究

基于高压水射流技术采用空化射流磨对不同粒径的煤样进行了破碎,从破碎后煤样的粒径分布、比表面积及形貌特征等方面研究了不同粒径的原煤样在不同射流压力下的破碎效果。试验结果表明,空化射流磨能在很短的时间内制备出粒径小于8μm且粒径分布非常窄的超细煤粉。射流压力和进料尺寸对射流磨的破碎性能有着重要影响,即射流压力越大,产物中超细煤粉的质量分数越大,其边角越圆滑且产物粒径分布也越窄;进料尺寸越大,射流磨的破碎效率越高。     

高纯锆英石湿法超细磨矿工艺参数的研究

高纯超细锆英石粉是制造高档卫生洁具陶瓷所用釉料中的乳浊增白剂。湿法超细磨矿是生产高纯超细锆英石粉的关键工序之一 ,它直接影响最终产品粒度分布、中位粒径和白度。本文着重研究锆英石超细磨矿工艺参数球料比、磨矿浓度、磨矿时间及磨矿介质球径的配比等对锆英石微粉产品质量的影响     

利用废弃微硅粉制备纳米SiO2粉体

本文以低含量微硅粉为原料,经酸浸,HF酸溶解、水解、干燥等步骤制备了纳米SiO2粉体.采用X-射线衍射(XRD),傅里叶红外光谱(FT-IR),冷场发射扫描电镜(SEM)及能谱(EDS)等手段对原料和产物进行了表征.结果表明制备的纳米SiO2粉体的SiO2含量＞97%,粒径分布均匀,平均粒径约90nm,BET吸附比表面积为210m2/g.本文对废弃微硅粉的资源化具有积极的作用.     

酸溶条件对橄榄石制备超细二氧化硅的影响

橄榄石矿物酸溶制备超细二氧化硅,原料价格低廉易得,生产工艺简单,可大大降低超细二氧化硅的生产成本,但酸溶环境对二氧化硅粒径有明显的影响.本文考察了硫酸浓度、液固比、超声分散及金属阳离子对超细二氧化硅粒径大小及分布特征的影响.结果 表明,硫酸浓度过高会导致二氧化硅颗粒的团聚;增大液固比、橄榄石酸溶的同时辅以超声分散、延长超声分散时间可显著减少二氧化硅的团聚;金属阳离子会导致二氧化硅的团聚;在硫酸浓度4 mol/L、液固比60 mL/g、酸溶时辅以超声分散可制备出平均粒径5.39 μm的超细二氧化硅.本研究为非金属矿酸法制备超细二氧化硅提供理论与技术支持.     

针状硅灰石超细粉制备工艺研究

采用不同的粉碎方式及工艺条件制备硅灰石超细针状粉,对产物的粒度及长径比有重要的影响。试验首先用冲击式粉碎机对硅灰石进行选择性粉碎和富集,然后用气流粉碎机和介质搅拌磨对冲击粉碎产物进行超细粉碎试验,结果表明,对于搅拌磨,柱状介质比球状介质更有利于保护硅灰石原来的针柱状形态;对于2种超细粉碎方式,气流粉碎比搅拌磨矿具有更好的选择性,其硅灰石产品的针状结构明显优异,可获得高长径比的硅灰石超细针状粉。通过试验,确定了2种超细粉碎工艺的适宜条件。     

高纯超细锑白的研制

采用低温氯化蒸馏和精馏的方法，从高砷锑烟尘制备出高纯度三氯化锑，再用金属醇盐水解法制备高纯超细氧化锑，产品纯度可达９９９９５５％，平均粒径为００１５μｍ。超细锑白的晶型为斜方晶体，热稳定性好，比表面积为６２４ｍ２／ｇ，白度为９０。     

La原料对LaMg17Ni储氢合金性能影响研究

为降低LaMg_(17)Ni储氢合金的成本并解决原材料La不稳定导致的安全问题,采用了La-H粉和La-Mg合金粉两种性能稳定且成本较低的原料替代La粉,利用机械合金化法制备了不同原料的LaMg_(17)Ni储氢合金,并对比两种不同原料制备合金的性能,探究性能差异的原因。采用比表面仪检测合金比表面积变化,用扫描电子显微镜(SEM)表征合金微观形貌,X射线衍射(XRD)表征合金制备前后和吸放氢前后相结构变化,利用高温高压气体吸附仪测试合金的吸放氢曲线、储氢量以及储氢速度。结果表明,以La-H粉为原料制备的合金储氢量达到4.58%,在3MPa氢气压力、温度573K以下,储氢速度为90s内达到饱和储氢量的90%以上,而以La-Mg合金粉原料制备的合金储氢量达到4.43%,在3MPa氢气压力、温度573K以下,储氢速度为120s内达到饱和储氢量的90%以上。由于La-H粉的高脆性使其在机械合金化过程中产生了更高的比表面活性以及内部原有LaH3相的直接催化作用,因此以La-H粉为原料制备的LaMg_(17)Ni合金储氢性能优于以La-Mg合金粉为原料制备的LaMg_(17)Ni合金。     

La原料对LaMg_(17)Ni储氢合金性能的影响

为降低LaMg_(17)Ni储氢合金的成本并解决原材料La不稳定导致的安全问题,采用了La-H粉和La-Mg合金粉两种性能稳定且成本较低的原料替代La粉,利用机械合金化法制备了不同原料的LaMg_(17)Ni储氢合金,并对比两种不同原料制备合金的性能,探究性能差异的原因。采用比表面仪检测合金比表面积变化,用扫描电子显微镜(SEM)表征合金微观形貌,X射线衍射(XRD)表征合金制备前后和吸放氢前后相结构变化,利用高温高压气体吸附仪测试合金的吸放氢曲线、储氢量以及储氢速度。结果表明,以La-H粉为原料制备的合金储氢量达到4.58%,在3MPa氢气压力、温度573K以下,储氢速度为90s内达到饱和储氢量的90%以上,而以La-Mg合金粉原料制备的合金储氢量达到4.43%,在3MPa氢气压力、温度573K以下,储氢速度为120s内达到饱和储氢量的90%以上。由于La-H粉的高脆性使其在机械合金化过程中产生了更高的比表面活性以及内部原有LaH3相的直接催化作用,因此以La-H粉为原料制备的LaMg_(17)Ni合金储氢性能优于以La-Mg合金粉为原料制备的LaMg_(17)Ni合金。     

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     

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     

2014 second batch of rare earth quota released

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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