Selective separation of yttrium from rare earth elements by ion interaction chromatography. Analytical and larger scale applications

ABSTRACT

New ion interaction chromatographic (IIC) method employing Kromasil 100 C₁₈ column and tetra-n-butylammonium hydroxide (TBAOH) as an ion interaction reagent (IIR) is able to separate yttrium from Rare Earth Elements (REE) as anionic complexes with nitrilotriacetic acid (NTA). New method for the chromatographic determination of Y in REE mixture was devised and validated by the analysis of the certified reference material (CRM). Potential possibilities of the new chromatographic system for larger scale applications including macro-micro events were demonstrated.     

中子活化分析法研究达拉布特蛇绿岩中超镁铁质岩的地球化学特征

用预浓集中子活化法测定了达拉布特蛇绿岩中超镁铁质岩中的稀土元素（REE），用仪器中子活化法测定了其中的过渡金属元素。依据测定结果分析了过渡金属及REE的地球化学特征。认为，二辉橄榄岩X12可能代表原始地幔的化学成分；二辉橄缆岩X10，X11和含矿的纯橄岩X17，方辉橄榄岩X18为上地幔经历了部分熔融后残留的地幔物质；不含矿的纯橄岩X8和异剥橄榄岩X7，X9为自镁铁质熔融体在上地幔内以堆晶作用形成的超镁铁质岩类。     

核纯铀中14种稀土杂质的萃取色层－光谱测定

采用我院研制的ＣＬ－５２０８和ＰＭＢＰ萃淋树脂，萃取色层分离－光谱法测定了核纯铀中１４种微量稀土元素。文中较详细地比较了不同类型激发光源和光谱仪器的稀土测定下限，以及样品激发保护气氛和电极构型对稀土测定灵敏度的影响。以取样量１ｇ计算，１４种稀土杂质定量测定下限在０．０００５—０．０４μｇ／ｇ。化学分离回收率在８５％－１１３％。方法相对标准偏差（ＲＳＤ）５％－２２％。样品对照结果基本符合。方法灵敏，操作简便，便于厂矿推广应用。     

内蒙古稀土产业现状及发展分析

在分析我国稀土行业现状的基础上，运用SWOT分析方法对内蒙古自治区稀土产业发展现状进行分析，并根据内蒙古自治区稀土产业发展的优势、劣势、机会和威胁、存在问题，提出了相关建议。内蒙古自治区稀土资源丰富，已经形成了包括采选、冶炼分离、深加工、新材料到应用产品的较为完整的工业体系，是全国最大的稀土原材料生产基地和供应基地。内蒙古稀土产业在原料储备、产业基础、区域位置等方面优势明显，但存在稀土资源综合利用率低、环境污染严重、自主创新能力不强等诸多问题。政府应该加强宏观调控和引导，促进稀土产业持续健康发展；增强企业的科研能力，加强企业与高校、研究机构的合作；增加稀土资源和环境的保护力度。     

江苏溧水火山岩盆地观山旋回岩石学特征

本文着重描述厂江苏溧水中生代火山岩盆地观山旋回岩石的岩石学、岩石化学和稀土元素等方面的特征.观山旋回火山岩普遍为高钾富碱的中偏碱性岩类;稀土元素特征为轻稀土富集,Eu 弱负异常,与大陆裂谷碱性玄武岩的稀土特征明显相似.最后就本区火山岩的岩浆来源作了初步讨论.     

Contrasting REE Signatures on Manganese Ores of Iron Ore Group in North Orissa, India

The distribution pattern of Rare Earth Elements （REE） in three categories of manganese ores viz. stratiform, stratabound-replacement, and detrital of Precambrian Iron Ore Group from north Orissa, India was reported. These categories of Mn-ore differed in their major and trace chemistry and exhibited contrasting REE signature. The stratiform ores were relatively enriched in ∑REE content （697 μg·g^-1） and their normalized pattern showed both positive Ce and Eu anomalies, whereas the stratabound-replacement types were comparatively depleted in ∑REE content （211 μg·g^-1） and showed negative Ce and flat Eu signatures. The detrital categories showed mixed REE pattern. The data plotted in different discrimination diagrams revealed a mixed volcaniclastic and chemogenic source of material for stratiform categories, and LREE （Light Rare Earth Elements） and HREE （Heavy Rare Earth Elements） are contributed by such sources, respectively. In contrast, the stratabound ore bodies were developed during the remobilization of stratiform ores, and associated Mncontaining rocks under supergene condition followed by the redeposition of circulating mineralized colloidal solutions in structurally favorable zones. During this process, some of the constituents were found only in very low concentration within stratabound ores, and this is attributed to their poor leachability/mobility. The detrital ores did not exhibit any significant characteristic in respect of REE as their development was via a complex combination of processes involving weathering, fragmentation, recementation, and burial under soil cover.     

岩石中稀土元素中子活化分析时Na、Sc、Fe Cr等干扰元素的去除

稀土元素的分离、分析,在地球化学、宇宙化学、环境化学等学科中起着极为重要的作用。近年来,国内外利用高分辨率γ谱仪中子活化分析法测定岩石中稀土元素的报道很多,虽然对放射化学分析流程都在不同程度上有所改进,但对超基性岩石中大量存在的~(24)Na、~(46)Sc、~(59)Fe和~(51)Cr等核素的去除,解决被测元素γ谱之间相互干扰(包括重峰干扰和康普顿本底干扰)     

Preparation and oxidation of an Y2O3-dispersed chromizing coating by pack cementation at 800 °C

Preparation and oxidation of an Y₂O₃-dispersed chromizing coating was investigated by chromizing an as-electrodeposited Ni-Y₂O₃ composite film using a conventional pack-cementation method but at a greatly decreased temperature (800 °C). For comparison, chromizing was also performed in the same condition on an as-deposited Ni film without Y₂O₃ particles. Oxidation at 900 °C indicated that compared to the Y₂O₃-free chromizing coating, the Y₂O₃-dispersed chromizing coating exhibited an increased oxidation resistance, due to the formation of purer and denser chromia scale. The Y₂O₃ effects on the coating formation and the coating oxidation behavior are discussed in detail.     

东昆仑卧龙岗锑矿痕量元素示踪及成因分析

新疆东昆仑卧龙岗一带存在多个中、大型锑矿床,为了解该锑矿富集区的物质来源,探讨其成矿机制,通过系统的野外地质调查,总结矿床地质成矿条件基础上,对矿区典型的矿石、石英脉及围岩进行了微量元素和稀土元素分析。结果表明:矿石、石英脉及围岩均具有轻稀土富集、分馏程度高、重稀土亏损的特点;锑矿石中Eu为无铕异常,Eu平坦型,Ce中度负异常,反映出成矿流体基本属于中性环境,矿体和围岩的稀土元素具有同源性;矿石、石英脉及围岩的微量元素特点相似,表明矿体和围岩的微量元素来源相同;围岩和石英脉展示出的轻稀土富集、重稀土亏损和Eu、Ce负异常的稀土配分模式与上部地壳的稀土配分模式十分相似,表明围岩中的稀土元素迁出很少,成矿流体对围岩稀土元素的组成影响很小,说明矿脉中的REE主要来源于上部地壳,赋矿围岩的贡献不大;成矿流体沿近北东-南西向断裂充填,矿床成因类型属于浅成热液充填型锑矿床。