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Novel precipitant prepared through carbonation with MgCl2 wastewater generated from rare earth extraction separation process and low-price dolomite as raw materials was studied in this paper. The purification methods of novel precipitant by adding appropriate oxidizing agent were studied. It was found that optimal purification result could be achieved with sodium hypochlorite as iron removal reagent and the iron removal rate could reach up to 90% when the adding amount was 0.1 vol.%. During the preparation, the particle size and distribution of ceria-based polishing powder were affected obviously by the parameters such as concentration, reaction temperature and feeding rate. The results showed that ceria-based polishing powder with D50 =2.5-3.5 μm and the particle size distribution of 0.65-0.75 μm could be prepared when the concentration of CeCl3 was 0.6 mol/L, the reaction temperature was maintained at 50 °C and the feeding speed was controlled at 25 ml/min. Compared with commercial powder, the self-made polishing powder had roughly the same cutting amount, but the surface finish of polished glass was better than that of commercial polishing powder. 相似文献
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以氟碳铈矿氧化焙烧-稀硫酸浸出-萃取洗涤得到的氟铝络合物溶液为原料,通过补充氟盐和钠盐控制一定的F/Al比、Na/Al比,并调节pH值得到冰晶石沉淀,经过滤、洗涤、烘干得冰晶石产品.重点探讨了合成冰晶石的原理,研究了溶液pH值、F/Al比、Na/Al比和合成温度等对冰晶石产品质量及回收率的影响,并对制备工艺进行了优化.研究结果表明:溶液pH值在5左右、F/Al比在5.5~6之间、Na/Al比在3.0~3.3之间,合成温度在95℃以上合成的冰晶石符合国家标准,且氟、铝的回收率均可达95%以上. 相似文献
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样品经碱熔,溶液提取,沉淀富集后得到只含稀土元素的溶液,采用电感耦合等离子体原子发射光谱(ICP-AES)法测定磷矿中15种稀土元素La、Ce、Pr、Nd、Sm、Eu、Gd、Tb、Dy、Ho、Er、Tm、Yb、Lu、Y。主要考察了共存元素间的干扰情况,选择无干扰或干扰量对分析结果可以忽略不计的谱线为最佳分析线,标准曲线法直接测定磷矿中稀土元素。本法测定结果与ICP-MS测定结果相符合,可满足日常分析要求。 相似文献
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The green-emitting(Ce,Tb)MgAl11O19(CTMA) phosphor was prepared by the conventional high temperature solid-state reaction method.The effect of fluxes on the crystal structure,particle morphology,size distribution and photoluminescence properties of CTMA phosphor was investigated by means of the X-ray powder diffraction,scanning electron microscopy and photoluminescence spectrum.The results showed that the addition of appropriate amount of MgF2-H3BO3 flux improved the phase purity of CTMA phosphor,and influen... 相似文献
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The novel nitride-based luminescent materials have received much attention since the end of the last century. In this paper, the commercial Eu2+-activated nitride red phosphors, Sr1.95Si5N8:Eu0.05, Sr1.85Si5N8:Eu0.15 and Ca0.99AlSiN3:Eu0.01 phosphors were an-nealed at different temperatures (beyond 300 oC) to investigate the dependence of their luminescence performance and structure vari-ability on the temperature. By photoluminescence spectra, X-ray diffraction (XRD) and thermogravimetry-differential scanning calo-rimetry (TG-DSC) analysis, the high temperature stability of the hosts and activator of the three samples were disclosed. With the an-nealing temperature increasing, the activator Eu2+ions were firstly oxidized and then host in Sr1.95Si5N8:Eu0.05 and Sr1.85Si5N8:Eu0.15, but for Ca0.99AlSiN3:Eu0.01, only the oxidation of the host could be observed, which would lead to the luminescence degradation and even failure of these phosphors. The activator Eu2+ions were much more stable in CaAlSiN3:Eu than Sr2Si5N8:Eu due to their crystal surroundings, and its concentration also influenced the temperature stability of Sr2Si5N8:Eu. 相似文献
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依据海南联网系统500 kV海底电缆捆绑特殊海底光缆的实际情况,通过分布式光纤传感技术结合经有限元仿真模型优化的IEC60287热路模型的方法可以监测海底电缆内部的温度分布。在实验室中搭建岸上模拟实验平台,利用中压电缆捆绑光纤的结构进行捆绑电缆岸上模拟实验。同时,将经验证的温度监测方法应用于海南联网系统500 kV海底电缆,以C相空气段为例监测捆绑电缆光单元的温度。采用有限元仿真计算电缆表面的温度,根据电缆表面的温度基于热路模型推导出对应的导体温度,得到电缆导体在实际运行过程中的温度变化。岸上模拟实验测量的导体温度与数值计算得到导体温度的误差低于1.77%, 验证了海底电缆导体温度监测方法的准确性。 相似文献
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