镁热法制备高纯金属镝

对镁热法制备高纯金属镝进行了研究，结果表明：采要用高纯氯化剂氯化高纯（4N）氧化镝（Dy2O3）制取无水氯化镝（DyCl3），用镁还原无水氯化镝制得镁－镝合金，再经蒸馏制备金属镝的工艺，可以制得高纯镝，纯度可达99．99％。     

钙热还原及熔盐萃取联合法一次性制备低氧低氟金属镝

对低氧低氟金属镝的制备工艺及机理进行研究,结果表明:采用氟化氢铵处理后,再用氟化氢气体氟化,并进行脱氟处理的干法氟化工艺,可得到高纯氟化镝,氟化率达99.9%;采用钙热还原及熔盐萃取联合法一次性制备工艺,可有效降低金属镝中的氧、氟含量,制备的金属镝纯度大于99.9%。     

高纯金属镝的制备工艺研究与工业实践

对高纯金属镝的制备工艺进行了研究，并用此工艺进行了工业实践。表明：采用氟化氢氟化－制备中间合金－低温蒸馏的工艺流程，是工业生产高纯金属镝较为适宜的方法。     

熔盐电解法制备镨钕镝合金的研究

利用4000 A电解槽,在氟化锂-氟化镨钕-氟化镝熔盐体系中,通过电解氧化镝与氧化镨钕的方法,制备了成分稳定的镨钕镝合金,金属直收率大于96%,电流效率大于75%。讨论了电解质组元、温度、阴极电流密度、加料速度对电解过程的影响。同时与钙热法生产金属镝、自耗阴极制备镝铁合金工艺进行综合性对比分析,结果表明,熔盐电解法在成本、工艺稳定、产品质量等方面具有绝对的优势。     

直接还原法制取稀土金属镝

本文就氟化镝钙热直接还原法制取稀土金属镝的有关工艺条件对还朱过程和金属回收率及质量的影响作了较详细的论述和探讨，指出了稀土金属镝还原的最佳配比和工艺条件。     

高品质氟化锌的制备

介绍了用复合氟化剂在氯化镝溶液中制取氟化镝，然后经真空干燥得到氟化熵产品。该工艺具有工艺流程简单、易于洗涤过滤、产品质量稳定、氟化镝含氧量低、收率高的特点。     

高品质氟化镝的制备

介绍了用复合氟化剂在氯化镝溶液中制取氟化镝 ,然后经真空干燥得到氟化镝产品。该工艺具有工艺流程简单、易于洗涤过滤、产品质量稳定、氟化镝含氧量低、收率高的特点     

高纯无水InCl_3制备工艺的研究

为了寻求高纯无水InCl_3的最佳制备工艺,提高高纯无水InCl3,的纯度、减少其含水量以及降低生产成本,以金属铟和氯气作为原料,采用金属铟直接氯化法制备高纯无水InCl_3,分析不同温度、时间下产物的转化率及铟含量,确定最佳反应条件。试验表明,加热至650℃反应时间为3 h时,可以生产出纯度为99.9%的高纯无水InCl_3,其产率可达94.1%。由此说明,用金属铟直接氯化法可以制得高纯无水InCl_3,并可运用于实际生产。     

高频红外吸收法测定氟化镝中碳和硫

以带卤素捕集器的高频红外吸收仪对氟化镝中碳和硫的测定进行了条件优选。用碳酸钠和硫酸钾作加料回收的回收率为 90 %～ 96 % ,连续测定七次的相对标准偏差为 3.5 %～ 6 .3%     

镝铁合金中稀土总量的测定——EDTA容量法

研究了EDTA容量法测定镝铁合金中稀土总量。采用氟化分离消除铁对滴定的干扰。进行了加料回收和精密度实验,回收率在99%~101%之间,RSD1%,被分析元素的测定范围在70%~90%。对容量法测定镝铁合金中稀土总量的研究结果令人满意。     

Preparation of Anhydrous LnCl3(Ln=Eu, Er, Lu) by Chemical Vapor Transport

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Preparation of anhydrous lanthanum bromide for scintillation crystal growth

This paper reported an efficient and economical method for preparation of anhydrous LaBr3 for scintillation crystal growth. High purity anhydrous LaBr3 powders in large quantities were successfully obtained by stepped dehydration of LaBr3·7H2O using NH4Br as addi-tive. Experiments revealed that adding proper amount of NH4Br could effectively restrain the hydrolysis of LaBr3 during dehydration and thus decreased the yield of deleterious impurity of LaOBr. Optimum preparation conditions, including the amount of NH4Br in use, the dehydra-tion temperature and atmosphere, were investigated by DTA/TG and water/oxygen analysis. The Raman characterization of the as-prepared anhydrous LaBr3 was also presented.     

高纯金属钪的制备

采用氟化氢铵氟化法制取氟化钪和选用高纯金属钙还原制取粗钪,再经真空蒸馏提纯可得相对纯度大于９９．９９％的高纯金属钪     

Synthesis of Y2O3 Nano-Powder from Yttrium Oxalate under Ambient Temperature

ThereareseveralprecipitationmethodsinthesynthesisofY2 O3 nano powdersuchascarbonatemethod ,ammoniumsaltmethodandoxyhydratemeth odetc .[1～ 5] ,buttheoxalateprecipitationmethodisconsideredtobethebestmethodinindustryandtheadvantagesofoxalicacidastheagentofp…     

Investigation of Pt-Dy co-doping effects on isothermal oxidation behavior of （Co,Ni）-based alloy

A Co32Ni21Cr8Al0.6Y (wt.%) alloy with and without doping 3 wt.% platinum, or co-doping 3 wt.% platinum and 0.1 wt.% dysprosium was produced by arc melting. The hardness of both base alloy and composition-modified alloy was measured by using a Vickers hardness tester. Isothermal oxidation tests at 1000 ℃ in static air atmosphere were conducted to assess the isothermal oxidation behavior of the alloys. The microstructure and composition of the tested alloys before and after oxidation were investigated by means of X-ray diffraction (XRD), field emission-scanning electron microscopy (FE-SEM) equipped with energy dispersive spectroscopy (EDS) and back scatter detector. Results showed that platinum had significant influence on microstructure of the tested alloy by the formation of β-(Ni,Pt)Al phase. Addition of 3 wt.% platinum could slightly increase the hardness of the tested alloy. Platinum accelerated phase transformation of alumina from metastable θ-Al 2 O 3 to stable α-Al 2 O 3 and suppressed the consumption of β-phase. Co-doping both 3 wt.% platinum and 0.1 wt.% dysprosium induced the fastest transformation of θto αalumina and the formation of a fine-grained oxide scales. The most effective reduction of oxidation rate was achieved by the Pt-Dy co-doping effects.     

溶胶-凝胶、自蔓延燃烧法制备ZnFe2O3和Ni0.35Zn0.65Fe2O4纳米材料

溶胶-凝胶法和自蔓延燃烧法相结合制备了ZnFe2O3，和Ni0.35Zn0．65Fe2O4纳米粉末。由硝酸盐和柠檬酸制备了凝胶。凝胶干燥得到的干胶在一定温度下点火，发生自蔓延燃烧生成产品。探讨了反应物配比、去离子水的量、反应温度对凝胶生成的影响。控制一定的温度和烧结时间，使晶体生长完全。通过X-射线衍射，测定了产品的粒度和纯度。表明该法制备的产品为纳米级．纯度高．不含硬团聚、分散性好、具有较高的烧结活性。     

杂质元素对金属镝压缩强度的影响

研究了金属镝中所含Ｓｉ、Ｃａ、Ｆｅ和Ｏ４种杂质元素对其压缩力学性能的影响。结果表明，Ｓｉ元素和Ｏ元素含量的增加会降低镝的压缩强度，与此同时，其塑性也有明显地降低。金属镝中所含Ｃａ元素和Ｆｅ元素对其压缩强度的基本没有影响。     

Preparation of Dy-Fe Alloy from Dy2O3 Bymolten Salt Electrochemical Process

Dy-Fe alloy replace dysprosium in the NdFeB permanent material can improve the performance and productivity and cut the cost.The electrolyte is a binary system of molten DyF3-LiF.Iron is cathode and graphite is anode.The raw material is Dy2O3 oxide.The content of dysprosium is (78 ～85 ) ± 1% in the Dy-Fe alloy made by electrolyzing in the industry producing.In the course of electrolyzing the efficiency of current, the alloy formation and the productivity of rare earths by studying the formation of electrolyte, the electrolyzing temperature, the standards and the current density of cathode, the anode shape etc were studied.The conclusion is that we can produce Dy-Fe alloy (the content of dysprosium is (78 ～ 85 ) ± 1% ) in this condition, the efficiency of current is greater than 68 %, and the productivity of rare earth is greater than 92%.The content of oxygen, calcium, wolfram is smaller than the content by reducing.