搅拌磨湿法研磨煤系煅烧高岭土的研究

HLM－400型超细盘式搅拌磨湿法研磨煤系煅烧高岭土的研究表明：搅拌磨的湿法超细磨矿是生产煅烧土微粉的有效途径。采用合理的工艺参数，可实现产品—2μm含量大于90％的要求。试验结果可为相关工艺设计提供依据。     

不同类型磨机对纤维水镁石超细粉碎的试验研究

采用搅拌磨(湿法)和振动磨(干法)两种不同设备，对纤维水镁石(FB)进行超细粉碎试验。试验结果：用振动磨超细FB，产品中位径是搅拌磨的1／5左右，比表面积为搅拌磨的3．6倍左右。实验农明：振动磨对FB超细粉碎效果较好，最佳研磨时间为3h，FB超细粉体的中位径D50为1．53μm，比表面积SA为2．606m^2／g，粒径分布比较集中。     

用搅拌磨制备超细粉体的试验研究

使用介质搅拌磨并以φ0．8～1．4mm氧化锆陶瓷微珠为研磨介质对水镁石、电气石、云母(包括白云母、金云母、绢云母)进行了超细粉碎试验。选择适宜的助磨剂、分散剂、料浆浓度、研磨时间等试验条件，得到了d50=0．78μm、d97=1．85μm的水镁石和d50=0．75μm、d97=1．07μm的电气石，以及d50=0．75μm、d97=1．93μm的云母超细粉体；而且物料的原有晶形在超细粉碎过程中得到了保护。     

用搅拌磨制备超细粉体的试验研究

使用介质搅拌磨并以0 8～1 4mm氧化锆陶瓷微珠为研磨介质对水镁石、电气石、云母(包括白云母、金云母、绢云母)进行了超细粉碎试验。选择适宜的助磨剂、分散剂、料浆浓度、研磨时间等试验条件,得到了d50=0 78μm、d97=1 85μm的水镁石和d50=0 75μm、d97=1 07μm的电气石,以及d50=0 75μm、d97=1 93μm的云母超细粉体;而且物料的原有晶形在超细粉碎过程中得到了保护。     

搅拌磨制备超细凹土粉体的工艺优化

以江苏某地的凹土为原料,用搅拌磨在干法环境下制备了粒径小于1μm、粒度分布均匀的超细凹土粉体。通过条件实验,系统地研究了粉碎时间、搅拌器转速、球料比、球磨介质种类和尺寸以及助磨剂等因素对搅拌磨粉磨效果的影响规律,初步确立了制备超细凹土粉体的最佳工艺条件,从而为实际生产中确定适宜的工艺参数提供了依据。     

硅酸锆超细磨矿试验研究

研究硅酸锆超细磨矿工艺，采用三段开路磨矿流程、CXM—1000型超细搅拌磨机、d=1．8～2．5mm硅酸锆磨介体系、磨矿浓度62．5％，分散剂为碳酸钠0．4％和六偏磷酸钠0．5％、磨矿时间3h，可获得产品粒度-2μm85．7％。     

电气石粉的超细研磨工艺研究

对电气石进行了超细研磨试验，采用低速搅拌磨循环磨矿-高速搅拌磨循环磨矿两段磨矿加工，研究确定了研磨工艺条件，得到的d95≤—2μm的电气石超细粉产品可作为人造纤维丝的功能性填料。     

钛白粉副产品绿矾制备超细氧化铁实验研究

以钛白粉副产品绿矾为原料，采用胶溶相转移法制备超细氧化铁。实验表明，胶溶是制备工艺的关键步骤，其最佳条件为：胶溶温度70．75℃、胶溶时间1～1．5h、溶液pH值为8～9。所得产品96.45％粒子粒径小于5μm，在氯仿等有机溶剂中具有极好的分散性，有望在高档涂料、化妆品等众多领域得到广泛应用。     

小于1微米碳化硅超细粉的研究与开发

对喷式气流磨是一种新型高效超细粉碎设备，本文介绍了气流磨制备小于1μm超细碳化硅过程中纯度能耗、分级效率的控制问题。结果表明：用气流磨可制得粒径小于1μm的碳化硅超细粉，产品粒度分布窄、粉碎及分级效率高、工艺简单。     

基于矩阵PBM的煤粉超细粉碎过程研究

建立基于研磨过程机理的煤粉超细研磨动力学模型可以预测超细磨出料的粒度分布和指导优化磨机的研磨效率,降低研磨能耗,对制备低灰分的超净煤具有非常重要的作用。通过田口(Taguchi)正交实验设计,使用实验室1. 5 L立式搅拌磨机考察了不同煤的物性参数、磨介尺寸和煤粉比处理量对于超细研磨的影响,将基于研磨过程特征的动力学模型——矩阵粒群平衡模型(Matrix Population Balance Model,M-PBM)用于煤粉的搅拌磨机超细研磨出料的粒度预测,并结合Rosin-Rammler粒度分布模型,精确地预测出料产品在任意筛下累积含量对应的颗粒粒度。通过极差分析,探讨了煤的灰分、磨介尺寸和煤粉比处理量对于超细研磨能耗和比通量的影响大小,基于对煤粉超细研磨过程中煤-灰解离过程的分析并结合Tomoyoshi的比表面积能耗公式,探讨了煤的灰分与能耗的关系,并进一步建立了煤的灰分、磨介尺寸和煤粉比处理量与磨机研磨比通量和能耗的关系式,研究发现搅拌球磨机湿法超细研磨的粒度变化规律符合一阶线性动力学假设,在定搅拌转轴转速和所考查的研磨粒度变化范围内,煤的灰分对搅拌磨机的比通量和能耗的影响是最大的,建立的研磨能耗和比通量关系式表明在10μm(p50)以下的超细粉磨粒度范围内,煤的研磨能耗随着灰分的提高、磨介尺寸的减小(磨介尺寸在0. 3～1. 8 mm)和比处理量的增大而减小,而比通量随着灰分的提高、磨介尺寸的减小和比处理量的增大而增大。     

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