用环烷酸—石油亚砜从混合氯化稀土溶液中萃取分离钆

进行了用环烷酸－石油亚砜从混合氯化稀土溶液中萃取分离钇的研究,用混合室体积为120L混合澄清槽,经120级串级分馏萃取分离,可获得纯度大于99．99％的YCl3溶液。与环烷酸－混合醇体系相比,环烷酸－石油亚砜体系的分相性能及有机流动性更好。分离出的YCl3溶液经进一步分离非要质后,可用于制取荧光级Y2O3产品,产品收率可达90．5％。     

环烷酸-石油亚砜-HCl体系制备荧光级氧化钇

本文研究了用环烷酸—石油亚砜—煤油为萃取剂，以富钇混合稀土氯化物为原料，制备荧光级氧化钇的工艺流程。用３６０升的混合—澄清槽，经两步分离，一步除杂，稳定得到了５Ｎ氧化钇，并制备出了荧光级氧化钇产品     

用环烷酸-石油亚砜-RECl_3体系从重稀土中萃取分离高纯氧化钇的研究

本文通过对环烷酸-石油亚砜-RECl_3体系“与环烷酸-混合醇-RECl_3体系”从重稀土中萃取分离钇的比较,表明了前者分相快,流动性好,可获得氧化钇纯度大于99.98%、收率达95%的良好结果;再经P_(507)除La、Ca,可得氧化钇纯度>99.99%,Ca<10ppm的产品。     

环烷酸萃取制备高纯Y2O3工艺的研究

阐述了以环烷酸-异辛醇-煤油和环烷酸-亚砜-煤油两种组成不同的有机溶液为萃取剂,在RE-Cl3-HCl体系中制取纯度大于99.999%Y2O3的工艺及萃取分离过程中萃取槽体平衡时稀土分布的情况。     

石油亚砜和环烷酸协同萃取稀土元素性能的研究

本文比较了石油亚砜和环烷酸在硝酸介质和盐酸介质中对稀土元素的协同萃取性能,发现在硝酸介质中,有机相表现了负协萃效应,在盐酸介质中,却表现为正协萃效应。实验同时表明,用石油亚砜取代混合醇作为环烷酸萃取体系的破乳剂是令人满意的。     

在环烷酸—石油亚砜—RECl_3体系中进行铈镨分组

环烷酸—混合醇—RECl_3体系用于分离稀土元素中的钇,这一工艺已经广为人知,并且在国内已经被广泛用于荧光粉级氧化钇的生产实践。石油亚砜对稀土元素的萃     

制取荧光级氧化钇过程中钙的分离

一、前言 荧光级氧化钇的试制与生产近年来在我国已有很大发展。荧光级Y_2O_3对钙的含量有严格的要求(Ca≤7PPm),关于钇与钙的分离我们倾向于环烷酸萃取法。 我厂以龙南富钇重稀土为原料,其中含钙约1～1.5％。经环烷酸萃取法分离钇与非钇稀土后所得的YCl_3溶液中Ca/Y_20_3约为20000ppm。本试验以这种YCl_3溶液为料液,用10％环烷酸作萃取剂,在单级设备     

用萃取法得混合稀土氯化物新工艺

浸出液经中和除杂,环烷酸捞稀土与反萃得混合稀土氯化物质/R_2O_3<0.3%,收率>97%,浓缩后混合稀土氯化物结晶也可直接作分组的原料,用环烷酸萃取粗分组得两种产品,一是粗钇Y_2O_3/∑P_2O_398—99%,收率97%;二是少钇稀土Y_2O_3/∑R_2O_s>0.3%,收率97%。     

高纯氧化钇清洁化生产工艺的研究

阐述了以环烷酸—异辛醇—煤油和环烷酸—石油亚砜—煤油两种组分不同的有机溶剂为萃取剂,在REC l3-HC l-HNO3体系中制取纯度≥99.999%高纯氧化钇清洁化工艺流程及特点。研究解决了工艺过程中各种化工辅料的循环使用和综合利用问题,以较低的运行成本实现了工艺过程中的废物资源化及产品化,同时提高了水的利用率,使提钇萃取分离工艺与环境治理有机结合,降低了工艺生产成本和环境治理成本,实现了清洁化生产。     

环烷酸萃取分离混合氯化稀土溶液中的铝

采用环烷酸+异辛醇+煤油萃取体系,研究有机相皂化度、相比(O/A)等工艺条件对含铝量为0.2~0.4g/L的混合氯化稀土溶液进行逆流串级萃取除杂的影响。最佳工艺条件为:环烷酸、异辛醇与煤油的体积比为(15%~20%)(15%~20%)(60%~70%)、皂化度0.10、相比(O/A)=1/2。萃余液出口水相杂质铝含量合格(Al_2O_3/REO0.01%)。     

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

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

微波外场对液相合成砂状氧化钇前驱体形貌的影响

在微波外场作用下,以YCl3溶液为原料、草酸为沉淀剂直接液相合成了大颗粒砂状Y2O3前驱体,采用SEM、XRD和TG-DTA对前驱体及热分解产物进行表征,考察了H2C2O4与YCl3的摩尔比、YCl3起始浓度、反应时间和反应温度等对前驱体形貌的影响.结果表明,在微波外场作用及H2C2O4与YCl3的摩尔比为2∶1、YCl3的起始浓度为0.5 mol/L、反应时间3 h和反应温度40℃液相合成条件下,可得到D50约为40μm的附聚形大颗粒砂状前驱体.     

Low-temperature electrochemical synthesis and characterization of ultrafine Y（OH）_3 and Y_2O_3 nanoparticles

Ultrafine Y(OH)3 nanoparticles were successfully deposited from an additive-free 0.005 mol/L YCl3 low-temperature bath on the steel cathode at the current density of 0.5 mA/cm2 and bath temperature of 10 oC. Heat treatment of the prepared Y(OH)3 nanoparticles at 600 oC in air led to the formation of Y2O3 nanoparticles. Thermal behavior and phase transformation during the heat treatment of Y(OH)3 were investigated by differential scanning calorimetry (DSC) and thermogramimetric analysis (TGA). The morphologies, crystal structures and compositions of the prepared materials were examined by means of scanning and transmission electron microscopy (SEM and TEM) as well as X-ray diffraction (XRD) and FT-IR spectroscopy. The results showed that the prepared Y(OH)3 nanoparticles was essentially amorphous and composed of well dispersed ultrafine particles with size of 4 nm. After heat treatment, the obtained oxide product was well crystallized cubic phase of Y2O3 nanoparticles with the grain size of around 5 nm. It was concluded that low-temperature cathodic electrodeposition offered a facile and feasible way for preparation of ultrafine Y(OH)3 and Y2O3 nanoparticles.     

Study on BSTO/MgO Ferroelectric Materials for Phase Shift Doped with Rare Earth Oxides

Phasedarrayantennascansteerthetransmitted orreceivedsignalswiththeadvantagesoffastscan ning,multipletargetstrackingandgoodanti jam ming.Theseantennasarecurrentlyconstructedusing ferritephaseshiftingelements,whicharecostly,large andheavy.Therefore,theirmil…     

富集稀土磷酸溶液中稀土的萃取研究

研究了P204从富集稀土磷酸溶液中稀土元素钇、镧、钕的萃取行为,并考察了初始水相中P_2O_5浓度、萃取相比、萃取剂浓度、萃取时间对稀土萃取效果的影响。结果表明,低磷酸浓度、较大相比、较高萃取剂浓度和较长萃取时间有利于萃取稀土,并得到了萃取优化条件:初始水相中P_2O_5浓度10%、萃取相比V_0/V_1=3/1、萃取时间15min、P204浓度30%,在室温下萃取钇、镧、钕3种稀土,单级萃取率均可达到90%以上。     

Molecular Dynamics Simulation of YCl_3 Melt

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铝土矿盐酸浸出过程研究

以澳大利亚难处理三水铝土矿为对象、盐酸为浸出剂进行无焙烧浸出试验,考察浸出温度、矿物粒度以及浸出时间对氧化铝浸出率的影响。结果表明,优化工艺条件为:矿物粒度-55μm、浸出温度100~110℃、浸出时间120 min、盐酸浓度10%、浸出液固比100∶7。此条件下氧化铝的浸出率为95.49%,氧化铁的浸出率为96.72%。以该酸浸液为原料,使用TBP-苯体系进行铝铁分离萃取试验,在萃取温度25℃、相比O/A=1∶1、盐酸浓度1.5 mol/L,萃取时间10 min的条件下,经单级萃取,溶液中铁元素的萃取率可达95%,铝元素损失率为6%,铁铝萃取分离系数为408,经3级以上逆流萃取,铁铝分离系数可达800以上。以纯水作为反萃剂,在温度25℃、相比O/A=1∶1、反萃时间5 min、单级反萃,铁的反萃率达95%。     

Interaction of Yttrium,Lanthanum, and Samarium Oxides at 1600°C

Phase equilibria and structural transformations in the La2O3–Y2O3–Sm2O3 system at 1600°C were studied by X-ray diffraction and petrography over the entire composition range. Solid solutions based on the hexagonal (A) modification of La2O3, cubic (C) modification of Y2O3, and monoclinic (B) modification of La2O3 (Sm2O3) were found to form in the system. The starting materials were La2O3, Sm2O3, and Y2O3 (99.99 %) powders. The samples were prepared from nitrate solutions with subsequent evaporation and decomposition at 800ºC for 2 h. The samples were subjected to heat treatment in three stages: at 1100°C (for 2464 h), at 1500°C (for 50 h), and then at 1600°C (for 10 h) in furnaces with Fechral (H23U5T) and Superkanthal (MoSi2) heating elements, respectively. The isothermal section of the La2O3–Y2O3–Sm2O3 phase diagram at 1600°C is characterized by three single-phase (A-La2O3, B-La2O3 (Sm2O3), C-Y2O3) and two-phase (A + B, B + C) regions. The ordered phase of perovskite-type was not found at 1600°C in this system. An infinite series of solid solutions based on the monoclinic modification of B-La2O3 (Sm2O3), which occupies the largest area of the isothermal section, forms in the system. Yttrium oxide stabilizes the total mutual solubility of lanthanum and samarium oxides. The lattice parameters of the B phase decrease, the lattice volume increases with the addition of a heavier ion, and the lattice of solid solutions based on the B modification of rare earth metal oxides becomes more densely packed with higher yttrium oxide. The lattice parameters of the B phase lattice vary from a = 1.3988 nm, b = 0.3774 nm, and c = 0.8427 nm in the single-phase sample containing 15 mol.% Y2O3–42.5 mol.% La2O3– 42.5 mol.% Sm2O3 to a = 1.3806 nm, b = 0.3709 nm, and c = 0.8312 nm in the two-phase sample containing 45 mol.% Y2O3–27.5 mol.% La2O3–27.5 mol.% Sm2O3.     

碱性体系中砷的反萃性能研究

针对溶剂萃取法处理含砷烟尘碱浸液中的砷未能实现高效反萃的问题,探究了以4%H2O2+饱和Na2CO3为反萃剂的试验效果。结果表明,在25℃、相比O/A=1、油水接触时间7min的条件下,4%H2O2+饱和Na2CO3可将该体系负载有机相中99%以上的砷反萃下来,同时得到可直接利用的循环萃取性能良好的再生有机相,有助于实现季铵盐萃取碱性溶液中砷的低成本和高效短流程化生产。     

稀土萃取过程智能控制系统

针对稀土萃取过程具有多变量、非线性、强耦合、大滞后、萃取组分含量难以连续测量等综合复杂性,提出了由智能优化设定和过程回路控制两层结构组成的稀土萃取过程智能控制系统。讨论了该系统的结构、功能以及所采用的控制策略。结合氧化钇萃取生产线的特点,研制了智能控制系统,并成功应用于某公司的氧化钇萃取生产线,取得了显著成效。