利用钙基膨润土制备4(A)沸石分子筛--酸化工艺条件的研究

以山东省莱西市河头店镇钙基膨润土为原料，探讨了制备4A沸石分子筛的酸化工艺条件，认为利用河头店镇钙基膨润土制4A沸石分子筛的最佳酸化工艺条件为：H2SO4浓度40％、酸土液固比4：1，酸化温度95℃，酸化时间8h。     

高岭土合成4沸石分子筛的技术工艺

本文系统地阐述了高岭土台成4A沸百分子筛的优势及技术工艺过程，并对4A沸石的质量质标及其检验方法作了简要叙述，探讨了高岭土法合成4A沸石分子筛的意义及前景．     

煤矸石制备4A分子筛研究

通过分析煤矸石的矿物组成、化学成分和4A分子筛的合成机理，设计了煤矸石预处理和水热法制备4A分子筛的工艺流程，并重点介绍了煤矸石合成4A分子筛工艺参数的选择及原理，为煤矸石合成高品质的A型沸石提供了借鉴。     

利用凹凸棒黏土制备4A沸石分子筛的研究

以江苏盱眙凹凸棒黏土为原料,经过焙烧处理后和碱溶补铝制备了4A沸石分子筛.实验结果表明:凹凸棒黏土经过650℃焙烧30min,用NaOH水溶液碱溶4h后加入偏铝酸钠,控制硅铝比为2.0,水钠比为50,在90℃晶化6h,可制得钙离子交换容量为295mgCaCO3/g的4A沸石分子筛,达到洗涤用4A沸石分子筛理化性能.产品的XRD图和SEM图与标准图谱一致.     

膨润土直接碱溶法制备4A沸石分子筛的试验

本文以四川盐亭膨润土为原料，经提纯后采用直接碱溶法制备了4A沸石分子筛。通过实验研究，获得了的膨润土直接碱溶法制备4A沸石的工艺技术条件。X射线衍射分析和扫描电镜分析结果表明，所获沸石样品纯度高，晶形呈发育完善的立方体连生体，粒径一般小于2μm；样品的钙离子吸附量达301．25mgCaCO3／g，白度为79．06％，分别达到了企业一级和二级产品的质量标准。直接碱溶法与酸化膨润土法相比具有成本低、工艺简单、环保等优势。     

低温制备煤矸石4A分子筛

为探索煤矸石高效利用的途径,以内蒙古某地煤矸石为原料,采用低温碱融-水热法进行了4A分子筛合成条件研究,并运用XRD、SEM对合成的4A分子筛进行了表征。试验确定的原料成分配比为n(SiO₂)∶n(Al₂O₃)=1.9、n(Na₂O)∶n(SiO₂)=2.2、n(H₂O)∶n(Na₂O)=30,在有导向剂情况下的晶化温度为50 ℃、晶化时间为30 h,合成的4A分子筛对Ca²⁺的交换能力为318.00 mg/g;XRD、SEM分析表明：合成的4A分子筛晶化程度和结晶度高,为结构完整、棱角分明、粒径约为2 μm的立方形晶体,具有纯度高、孔隙度适中的特点。该4A分子筛符合《QB/T 1768-2003,洗涤剂用4A沸石》规定的技术要求。     

粉煤灰合成4A分子筛的机理及工艺技术参数分析

通过分析粉煤灰的矿物组成、化学成分和4A分子筛合成机理,设计了粉煤灰水热法制备4A分子筛的工艺流程,并重点介绍了粉煤灰的n(S iO2)/n(A l2O3)、n(Na2O)/n(S iO2)、n(H2O)/n(Na2O)、凝胶形成温度和时间、晶化温度和时间以及晶种添加等方面的原理及工艺参数选择情况,可为粉煤灰合成高品质的A型沸石提供借鉴。     

4A沸石分子筛制备及其影响因素

总结了制备4A沸石的各种方法,对比了它们各自的特点,对制备4A沸石的原料、活化除杂工艺及合成机理进行了概括;同时对影响4A沸石合成的因素：原料粒度、杂质、合成工艺参数及晶化导向制作了较详细的说明;对4A沸石分子筛的性能及表征亦有论述。     

铁改性沸石分子筛合成时离子交换性能影响因素研究

以天然丝光沸石为原料,研究了活化温度、FeCl3溶液浓度、浸泡时间、沸石分子筛颗粒大小等因素,对农药用Fe改性沸石分子筛合成的影响。结果表明：500℃为该沸石分子筛的最佳活化温度,经高温培烧的沸石分子筛,其离子交换能力较低温焙烧的沸石分子筛强;低浓度的FeCl3溶液较高浓度的能够促进离子交换;低浓度（0．0083mol/cm^3）的FeCl3溶液浸泡丝光沸石只需1min左右,即可达到离子交换的动态平衡状态;丝光沸石的颗粒越小,离子交换速率越快。     

利用粉煤灰合成13X沸石分子筛的实验研究

以北京某热电厂的粉煤灰为主要原料，经过对原料的焙烧处理、水热合成实验，合成了13X沸石分子筛。倍烧实验确定了优化焙烧参数：粉煤灰／碳酸钠为1：1．05(摩尔比)，倍烧温度830℃，倍烧时间1．5h。采用正交设计法确定了水热法品化的优化工艺参数：M2O／SiO2(mol)为1．32，H2O／M2O(mol)为55，晶化时间：10h，品种加入量8％(水体积)。合成沸石的纯度较高，具有优良的热稳定性，吸附量达到国家化学工业产品标准。     

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

正~~     

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