镧热还原铥镱镥富集物时杂质行为的讨论

从理论上阐述了以镧热还原法，出铥 镱镥富集物直接取取金属镱时稀土与非稀土杂质的热力学行为；实验验证了这些杂质的行为走向。讨论指出，采取相应的技术措施，正确把握各类杂志的走向，可以是较高纯度物的还原产品。     

镧热还原铥镜镥富集物时杂质行为的讨论

从理论上阐述了以镧热还原法，由铥镱镥富集物直接提取金属镱时稀土与非稀土杂质的热力学行为；实验验证了这些杂质的行为走向．讨论指出，采取相应的技术措施，正确把握各类杂质的走向，可以获得较高纯度的还原产品．     

铥,镱,镥富集物全分离新工艺的研究

本研究采用P507-HCI体系进行Tm／Yb／Lu三出口萃取粗分离及P507萃淋树脂萃取色层分离提纯相衔接的方法，成功地实现了铥、镱、镥富集物的全分离，分别获得纯度大于99．95％的高纯Tm2O3、Yb2O3和Lu2O3产品，结果是令人满意的。本研究成果，在国内属高效、快速分离铥、镱、镥富集物的新工艺。对于进一步开发和应用我国南方的重稀土资源有较大的现实意义。     

用氧化镱富集物制取金属镱的工艺研究

研究了从氯化镱富集物中，应用镧热还原法制取金属镱的工艺条件，小试和扩试结果表明，制得的全属镱的纯度（Ｙｂ／ＲＥ）大于９９％，金属镱的直收率大于８７％。     

用氧化镱富集物制取金属镱的热力学分析

用氧化镱富集物制取金属镱的热力学分析邓汝富方诚厚吴炳乾肖房春张文（南方冶金学院３４１０００）（赣州有色冶金研究所）关键词：氧化镱富集物金属镱热力学分析目前，金属镱的冶炼国内外一般采用传统的工艺方法，即在真空条件下，以纯Ｙｂ２Ｏ３为原料，用镧热还...     

镧热还原氧化钐过程镧的表面富集现象探索

对镧热还原氧化钐的反应产物镧渣,通过扫描电镜及X射线能谱仪进行了显微观察和成分分析,结果发现：镧热还原氧化钐过程中,还原剂金属镧由反应物料的内部扩散至表面并产生富集,造成金属镧利用率及金属钐收率下降。通过配料优化试验,找出了提高金属镧利用率及金属钐收率的方法。     

同还原渣提取高纯氧化铥和氧化镥新工艺研究

研究了以铥、镱、镥富集物经金属镧热还原法提取金属镱石所得的还原渣为原料，经酸溶配料，用稀土硫酸钠复盐沉淀除去镧，滤液用Ｐ５０７萃淋树脂萃取色层法提取高纯氧化铥、氧化镱，氧化镥（纯度均大于９９．９５％），并获得较高的收率。确定了稀土硫酸钠复盐沉淀除镧和萃取色层法分离铥、镱、镥的最佳分离条件。     

D418氨基膦酸螯合树脂吸附铥镱镥混合稀土离子的机理研究

通过饱和容量法、等摩尔系列法、斜率法确定了氨基膦酸树脂吸附铥、镱、镥混合稀土离子时所形成的配合物的配位比为1.5∶1,吸附过程既有单分子螯合配位,也有双分子螯合。通过红外光谱初步分析判断,氨基膦酸螯合树脂功能基中的氮、氧原子与稀土配位成键,形成了配位化合物。     

HL—P507萃淋树脂色层法分离铥,镱,镥单一产品探索性试验研究

介绍了以ＨＬ－Ｐ５０７萃淋树脂为萃取色层材料，盐酸溶液作淋洗剂，从铥镱镥稀土富集物中提取大于９９％的Ｔｍ２Ｏ３、Ｙｂ２Ｏ３、Ｌｕ２Ｏ３单一产品的工艺试验，试验选择了合适的工艺条件包括铥镱镥富集物的分解、料液的制备、柱上色层分离、草酸沉淀和灼烧等工序。料液经色层梯度淋洗分部收集流出液即可得到大于９９％的Ｔｍ２Ｏ３、Ｙｂ２Ｏ３、Ｌｕ２Ｏ３单一产品。     

稀土冶炼副产品铈富集物的提纯工艺研究

四川冕宁稀土矿生产工艺采用两步盐酸优溶法生产少铈富镧混合氯化稀土,产生大量的铈富集物产品。这种粗铈产品提纯困难,价格低廉,用途单一,只能用来生产稀土硅铁合金。采用硫酸溶解铈富集物,溶解完全后加入还原剂——硫脲,四价铈还原成三价铈,使混合稀土全部为三价稀土。用Mg O中和除渣后用P204-煤油萃取全捞稀土,盐酸反萃取,提取出混合氯化稀土。     

Background Absorption of Lutecium and Ytterbium Matrices in Graphite Furnace Atomic Absorption Spectrometry

Ｒａｒｅｅａｒｔｈｃｏｍｐｏｕｎｄｓｏｆｈｉｇｈｐｕｒｉｔｙｈａｖｅｂｅｅｎｅｘｔｅｎｓｉｖｅｌｙｕｓｅｄｉｎｍａｎｙｎｅｗｍａｔｅｒｉａｌｓｓｕｃｈａｓｌａｓｅｒ,ｍａｇｎｅｔｉｃａｎｄｆｌｕｏｒｅｓｃｅｎｔｍａｔｅｒｉａｌｓ．Ｔｈｅｒｅｆｏｒｅｔｈｅｒｅｉｓａｈｉｇｈｄｅｍａｎｄｆｏｒｔｈｅｐｒｅｃｉｓｅａｎａｌｙｓｉｓｏｆｔｈｅｕｌｔｒａｔｒａｃｅｉｍｐｕｒｉｔｙｅｘｉｓｔｉｎｇｉｎｈｉｇｈｐｕｒｅｒａｒｅｅａｒｔｈｃｏｍｐｏｕｎｄｓ．Ｇｒａｐｈｉｔｅｆｕｒｎａｃｅａｔｏｍｉｃａｂｓｏｒｐ…     

富镧钕金属在RECl3-KCl和RECl3-KCl-CaF2体系中溶解损失研究

利用差重分析 ,研究了富镧钕金属在 RECl3 - KCl和 RECl3 - KCl- Ca F2 体系中溶解损失及添加剂Ca F2 对其的影响 ,得到了数学模型 ,绘制了各因素与溶解损失的关系曲线 ,并进行了讨论     

采用中频炉还原高Cr、Ni等离子切割渣氧化物

通过采用中频炉冶炼不锈半钢试验,即对水下切割、空气中切割不锈钢所产生的等离子切割渣氧化物的还原处理,实现质量分数为20%以下的氧化物的还原反应,生成不锈半钢,达到再生利用Cr、Ni、Mo等贵重金属的目的。该试验主要通过对炉衬材料的选择,对高温冶金反应温度、反应强弱与不锈半钢含碳量的关系的分析,不锈半钢成分的分析证实了采用等离子切割渣冶炼不锈半钢的可行性。     

含碱金属的钽富集物分解方法研究

分析了碱金属K、Na对钽富集物分解率的影响情况，应用沉淀的转化理论，用石英粉作转化剂，适量加入，全过程不加热，分解率从92％提高至99％以上。     

电池级稀土氧化物制备工艺的研究

南方中钇富铕混合稀土先后经Ｎｄ／Ｓｍ分组、Ｌａ／ＣｅＰｒ／Ｎｄ分离,分别得到镧铈镨钕、镧、铈镨富集物、钕;北方富铈氯化然土原料经Ｃｅ／Ｐｒ分组得到镧富休物;除去稀土中非稀土杂质,经沉淀、灼烧后制备多种优质稀土氧化物,混样调配,为火法电解生产电池级稀土金属提供原料。     

Sintering of Si3N4 Ceramics with Additives Containing Yttrium and Ytterbium Oxides with Microwave and Traditional Heating

Compaction processes, phase transformation, and porous structure evolution are compared for materials based on silicon nitride containing yttrium and ytterbium oxides under microwave and traditional heating conditions. Experiments by microwave heating are performed in a special gyrotron device operating at a frequency of 30 GHz in a nitrogen atmosphere at normal pressure with a constant heating rate of 30, 60, and 90 deg/min. Traditional sintering is carried out in a tubular continuous furnace with a tungsten muffle in a nitrogen atmosphere at normal pressure with a heating rate of 60 deg/min. It is established that under microwave heating conditions compaction of the test materials and the start of the phase transformation occur at temperatures 100-150 deg lower than those typical for traditional heating. In material with a reduced amount of oxide additives compaction is accompanied by an increase in the proportion of large pores which is the reason for a slow-down in compaction both with traditional heating and with microwave one. It is suggested that the reason for acceleration of mass transfer with microwave heating is the specific nature of the interaction of the microwave field with the liquid phase formed, promoting development of non-diffusion transfer of solid-phase elements dissolved within it and the mechanical effect on its particles.     

Studies on the Kinetics of Carbon Tetrachloride Chlorination of Refractory Metal Oxides

Studies on the kinetics of chlorination of the oxides of titanium, zirconium, niobium and tantalum by carbon tetrachloride gas in dilution with nitrogen, at low and moderate temperatures, have been carried out. In each case, the effect of time, temperature, partial pressure of carbon tetrachloride and the particle size, on the chlorination of the oxide, has been studied. The influence of some physico-chemical properties of the oxides and their halides on the kinetics process, has been discussed. The chlorination results below and above the dissociation temperature of carbon tetrachloride (～ 773 K) have been examined to find out the difference in the kinetics by CCl₄ and those by elemental carbon and chlorine. From these kinetics results, the mechanism of the chlorination of each of the oxides, has been established and compared. The optimum experimental conditions for preparing the metal chlorides, keeping in view of the maximum utilisation of the carbon tetrachloride, have been established. The merits of carbon tetrachloride as a chlorinating agent, have been highlighted. From these kinetics results, the scope for chlorinating the refractory metal oxides, as well as their mixed oxides, at lower temperatures and lower partial pressures of carbon tetrachloride, with the scope for recycling the reagent, has been briefly discussed. Some preliminary results on the preferential chlorination of these oxides by carbon tetrachloride present in a typical tin slag, have been presented, to further substantiate the merits of carbon tetrachloride as a low temperature chlorinating agent.     

Studies on the Kinetics of Carbon Tetrachloride Chlorination of Refractory Metal Oxides

Abstract

Studies on the kinetics of chlorination of the oxides of titanium, zirconium, niobium and tantalum by carbon tetrachloride gas in dilution with nitrogen, at low and moderate temperatures, have been carried out. In each case, the effect of time, temperature, partial pressure of carbon tetrachloride and the particle size, on the chlorination of the oxide, has been studied. The influence of some physico-chemical properties of the oxides and their halides on the kinetics process, has been discussed. The chlorination results below and above the dissociation temperature of carbon tetrachloride ( ～ 773 K.) have been examined to find out the difference in the kinetics by CC1₄ and those by elemental carbon and chlorine. From these kinetics results, the mechanism of the chlorination of each of the oxides, has been established and compared. The optimum experimental conditions for preparing the metal chlorides, keeping in view of the maximum utilisation of the carbon tetrachloride, have been established. The merits of carbon tetrachloride as a chlorinating agent, have been highlighted. From these kinetics results, the scope for chlorinating the refractory metal oxides, as well as their mixed oxides, at lower temperatures and lower partial pressures of carbon tetrachloride, with the scope for recycling the reagent, has been briefly discussed. Some preliminary results on the preferential chlorination of these oxides by carbon tetrachloride present in a typical tin slag, have been presented, to further substantiate the merits of carbon tetrachloride as a low temperature chlorinating agent.     

太钢4号高炉提铁降硅后的操作实践

太钢4号高炉(1650m^3)在尖山矿提铁降硅后原料条件发生很大变化,为保持高炉稳定顺行,针对冶炼条件的变化,提出了合理的烧结控制参数,从原燃料管理、高炉操作等方面制定了严格的生产方案,保证了炉料结构大变动时的平稳过度,达到提高经济效益的目的。     

A Study on the Specific Heat of the Lanthanide Oxides

In this paper,we report the measurements of the specific heat of the lanthanide oxides(La_2O_3,CeO_2,Pr_6O_(11),Nd_2O_3,Sm_2O_3,Eu_2O_3,Gd_2O_3,Tb_4O_7,Dy_2O_3,Ho_2O_3,Er_2O_3,Tm_2O_3,Yb_2O_3,Lu_2O_3)from-150℃ to800℃ by using adiabatic scanning calorimeter.We found that chemical reactions occur during the heating pro-cess of initial La_2O_3 and Nd_2O_3 materials by using DTA and X-ray diffraction.The results of specific heatmeasurement show that except CeO_2 and Tb_4O_7,other twelve lanthanide oxides were accompanied withendothermal change and weight loss to a certain degree during the heating process.