共查询到20条相似文献,搜索用时 62 毫秒
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研究了不同的分散条件对平均粒径为130nm的TiC粉体在水介质中分散行为的影响.采用超声波振荡和添加分散剂等分散技术对TiC粉体进行分散,利用透射电镜(TEM)及激光粒度分析仪测定纳米TiC粉体在水介质中的粒度及粒度分布,用沉降量和Zeta电位对TiC悬浮液的稳定性进行表征.实验结果表明,分散剂用量为0.6%,pH=5时,分散效果最好.说明适量添加MN能有效改善纳米TiC粉末在水基体系中的分散性. 相似文献
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超细电气石粉体的制备和负离子释放性能研究 总被引:13,自引:1,他引:12
电气石是一种以含硼为特征、化学组成复杂的环状结构的硅酸盐矿物。超细电气石是一种具有健康和环保功能的粉体材料。本文使用介质搅拌磨对电气石粉进行了超细粉碎实验室试验研究和中试,并对试验样品进行了粒度检测、扫描电镜(SEM)分析以及负离子释放性能检测。结果表明,制取的超细电气石粉体的粒度及其分布为d50≤0 8μm、d97≤2 0μm,颗粒形状规则,静态平均负离子释放率达到4225ions/cm3,为原料的2~3倍。 相似文献
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高浓介质法强化处理一水硬铝石型铝土矿 总被引:4,自引:0,他引:4
采用高浓度碱性介质强化浸出一水硬铝石型铝土矿,研究反应温度、矿粉粒度、添加剂等因素对氧化铝溶出率的影响。高浓碱性介质中Al2O3溶出率较传统拜耳法提高约10%,在280℃,NaOH:ore=4:1,反应时间90min,矿粉粒度-76μm,CaO添加量8%的条件下,Al2O3的溶出率最高,达到98.7%。高浓介质法所得赤泥中Na2O含量仅为拜耳法赤泥的约1/4,碱耗低,污染少。 相似文献
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利用机械合金化(MA)制备了超细粉体,并采用固相反应法在Q235钢表面制备了Al2O3-TiB2复相陶瓷涂层,用X射线、激光粒度仪、扫描电镜(SEM)、差热分析仪(DTA)研究了粉体和涂层的物相组成、粒度分布及截面形貌,并测试了涂层的耐磨、耐蚀性能。结果表明,MA后骨料粉体的粒度可达纳米级;700 ℃热固化后涂层有Al2O3、TiB2和MgAl2O4等新相生成;封孔处理后涂层相对耐磨性最多提高321倍;涂层耐蚀性能最多提高952倍,封孔后的涂层耐蚀性能最多提高1548倍。 相似文献
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Gao Wei 《中国稀土信息(英文版)》2014,(11)
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 相似文献
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《中国稀土信息(英文版)》2014,(8)
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 相似文献
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YANG Li 《中国稀土信息(英文版)》2014,(6)
<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 相似文献
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<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 相似文献
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《中国稀土信息(英文版)》2014,(6)
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 相似文献
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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。 相似文献
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《中国稀土信息(英文版)》2014,(10)
<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 相似文献
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《中国稀土信息(英文版)》2014,(8)
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. 相似文献
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<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 相似文献
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《中国稀土信息(英文版)》2014,(12)
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. 相似文献