Sensitizing Effect of Mixed Surfactants on the Colouration of Scandium(Ⅲ)with Phenylfluorone or Its Derivatives

In the presence of mixed micelle of a cationic and a nonionic surfactants,the reaction of scandium(Ⅲ)with phenylfluorone or its derivatives results in a very sensitive colouration:furthermore this chromophoricsystem tolerates the existence of a considerable amount of masking agents,so that many interfering ions can bemasked and its selectivity would be further improved.After studying the optimum conditions and main charac-ters of some similar systems,the system of Sc(Ⅲ)—Orthonitrophenyuorone—CetyltrimethylammoniumBromide(CTMAB)—Triton X-200 is chosen for the spectrophotometric determination of microamount ofscandium.The proposed method shows not only high sensitivity(with a molar absorptivity of 2.12×1~sLmol~(-1)·cm~(-1))and selectivity,but also high tolerance of chromophoric conditions.Beer's law is obeyed over arange of 0～6.0 μg Sc/25ml.If the dual-wavelength method is applied,a much higher molar absorptivity o|"3.04×10~5L·mol~(-1)·cm~(-1)than those of other systems ever reported in the literatures can be attained:more-over.its linear range is extended to 0～8.0 μg Sc/25ml and its reproducibility is also improved.     

Extraction-chromatographic Separation of Microamount Scandium(Ⅲ)with HEH(EHP) Resin and Its Analytical Application

The optimum conditions for the extraction-chromatography by using 2-ethylhexyl-2-ethylhexyl-phosphonate resin to separate scandium(Ⅲ)from large amounts of other metal ions were reported.A me-thod for the separation and determination of microamount of scandium has been developed.This methodgives higher accuracy and reproducibility than solvent extraction with PMBP,especially,for the samplescontaining high content of titanium.Many shortcomings of other methods ever reported can be overcomeby the present method.     

Ion Flotation of Scandium

Scandium was recovered from dilute chloride solutions with potassium salt of saturated C_8～C_(12)fattyacids as surfactant by Ion flotation.The optimum comprehensive results of physical properties,stability andscandium concentration of the foam formed with potassium caprate CH_3(CH_2)_8 COOK can be obtained.Re-covery of scandium in the foam was 98% at pH 3.8～5.0 and 25～55℃.The experimental results of 0.3 L/minairflow rate was satisfactory for flotation column.It is of a great potential for using ion flotation technique toconcentrate scandium from dilute solutions.     

含钪铝合金的研究进展

钪是优化铝合金性能最为有效的合金元素，含钪铝合金强度高，塑性好，焊接性能，耐腐蚀性能等优良，是舰船、航空航天、核能等国防军工尖端领域用新一代铝合金结构材料，通过对Al-Mg-Sc和Al-Zn-Mg-Sc合金的研究状况分析，综述了钪与铝及铝合金的作用关系和对性能的改善作用。并提出我国含钪铝合金的研究方向。     

从赤泥盐酸浸出液中提取钪

本文研究了从赤泥的盐酸浸出液中回收钪的工艺条件。以1％P507^＋煤油为有机相。相比O／A=1：1。萃取时间15min。钪的萃取率达90％以上。用6mol/LHCI为洗液。洗涤有机相二次。水洗二次。洗涤相比O／A-3：1。反萃剂为2NNaOH溶液。相比O／A-3：1，反萃温度50℃。最终得到的富集物中Sc2O3的纯度为66．09％。富集了2600倍以上。     

水相荧光分析法测定地质样品中的钪

研究了在水相中用桑色素荧光分析法分析钪的体系．该体系中钪的线性范围为０～６μｇ／２５ｍＬ，检出限为１．７ｎｇ／ｍＬ．体系获得了很好的选择性，铍、铝、钇及稀土不干扰．采用ＰＭＢＰ萃取分离，对地质样品的分析获得了满意的结果，试验了表面活性剂及有机小分子的影响．     

Mineralogy and flotation of rare-earth-bearing barium fluorophlogopite

In iron-making processes with rare-earth-containing iron ores as feeds, therare-earth oxides report to slags. While most rare-earth oxides in the slags can be recovered by a combination of high intensity magnetic separation with gravity separation processes, europium and scandium remain in tailings of the slag mineral separation process. Crystal structure and chemical composition of the europium and scandium-bearing “mineral” in the slags have been determined by X-ray diffraction and electron microprobe analyses. This “mineral” was identified as rare-earth-bearing barium fluorophlogopite (REBF). Flotation experiments were conducted to investigate the flotation behaviors of the REBF. Experimental results show that the REBF can be collected by using dodecylammonium acetate, sodium oleate or a combination of both in an appropriate proportion and sequence. The flotation reaction of the REBF with the collectors was discussed with the help of infrared spectra and electrokinetic measurements. Physical adsorption of the cationic collector and chemical adsorption of the anionic collector on the surface of the negatively charged REBF were observed. Synergistic effect is significant when addition of sodium oleate is followed by addition of dodecylammonium acetate during flotation.     

赤泥和钛白废液中提钪的浸出工艺研究

通过对赤泥中物相组成及钪的分布状态分析,提出将赤泥和钛白废液这两种工业废弃物酸碱中和后,再进行钪的提取。试验结果表明,赤泥和钛白废液浸出过程中对钪浸出率影响最大的是液固比,其次为浸出温度,而浸出时间的影响最小。浸出工艺的优化条件为液固比为3∶1,60℃下浸出30min时,浸出体系的过滤性能良好,浸出液中硫酸浓度为1.81 mol/L,其稳定性良好,钪富集浓度为28.4mg/L,钪浸出率为69.75%。     

钪—间硝基偶氮氯膦络合物的研究

本文研究了钪与间硝基偶氮氯膦的成络反应。结果表明,在该体系中能生成α、β和γ型三种钪络合物,继而确定其生成的最佳条件,并测定了相应各络合物的组成和稳定常数。     

从锆英石提取钪的研究

锆英石是钪的重要来源之一,本文叙述了从ZrOCl_2结晶母液中提取钪的方法,此法主要包括磷酸沉锆,P204萃取,HCl洗涤,NaOH反萃及精制等过程。