Cyanex 923对稀土元素硝酸盐的萃取

研究了Ｃｙａｎｅｘ９２３在正庚烷溶液中对１５种稀土元素硝酸盐的卒取，计算了分离系数，得出了反应机理，考察了温度对萃取平衡的影响以及萃合物的红外光谱，发现Ｃｙａｎｅｘ９２３有可能应用于从轻稀土中分离镧以及从重稀土中分离钇。

P204-Cyanex 923磺化煤油用于铟的萃取和反萃研究

采用正交试验系统研究和对比了高原条件下P204磺化煤油和P204-Cyanex 923磺化煤油对铟的萃取和反萃条件。研究表明,适量添加Cyanex 923可在不影响萃取率的同时,降低有机相对铁的萃取;3 mol/L HCl+1 mol/L ZnCl2溶液对P204-Cyanex 923磺化煤油具有良好的反萃性能。

EXTRACTION KINETICS OF YTTRIUM WITH PURIFIED CYANEX 923 FROM NITRATE MEDIUM

Mass transfer and extraction kinetics of yttrium with the purified Cyanex 923 in n-heptane from nitrate medium have been investigated by using a constant interfacial cell with laminar flow at 298K. The interfacial adsorption properties of purified Cyanex 923-heptane-0.20mol/L (H, Na)NO3 were studied at 298K. The experimental results show that the mass transfer is controlled by diffusion and the chemical reactions are carried out in the interfacial zone. The extraction rates of yttrium were measured at different chemical compositions by varying ionic strength, pH values and the purified Cyanex 923 concentrations. The initial extraction rate equations were obtained.

Kinetic Study of Ce^(4+)Extraction with Cyanex 923

Ce 4+ extraction rate from aqueous sulphate solutions by Cyanex923 in heptane was studied using a constant interfacial cell with laminar flow at 30 ℃. The experimental hydrodynamic conditions were chosen and the contribution of diffusion to the measured rate of reaction was minimized. Cerium extraction rate was measured at different chemical composition by varying the concentrations of hydrogen ion, sulphate and Cyanex923. A cerium Cyanex923(B) extractive is formed at the interface. The data were analyszed in terms of pseudo first order constants and a reaction mechanism was developed.

EFFECT OF BORIC ACID ON THE EXTRACTION OF BASTNASITE LEACHING LIQUOR BY CYANEX 923

The effect of boric acid on the extraction of bastnasite leaching liquor by Cyanex 923 was studied. Boric acid wasn’t extracted alone by Cyanex 923 and didn’t influence the cerium(IV) extraction. But it can enhance the extraction of hydrofluoric acid evidently and came into organic phase in form of (HF)(H3BO3).(Cyanex 923).

Extraction and Stripping of Ytterbium (Ⅲ) from H_2SO_4 Medium by Cyanex 923

The extraction and stripping of ytterbium（ Ⅲ） from sulfuric acid medium using Cyanex 923 in heptane solution was investigated. The effects of extraetant concentration, pH and sulfate ion as well as stripping agents, acidity and temperature on the extraction and stripping were studied. The equilibrium constants and thermodynamic parameters, such as △n （10.76 kJ·mol^-1）, △G （-79.26 kJ·mol^-1） and △S （292.41 J·K^-1·mol^-1）, were calculated. The extraction mechanism and the complex species extracted were determined by slope analysis and FTIR spectra. Furthermore, it was found that the extraction of Yb （Ⅲ） from sulfuric acid medium by Cyanex 923 increased with pH, concentration of SO4^2-, HSO4^-, and extractant concentration, and approximately a quantitative extraction of Yb（ Ⅲ） was achieved at an equilibrium pH near 3.0, and the extracted complex was YbSO4（HSO4）·2Cyanex923（o）.

Cyanex 923在金属溶剂萃取中的应用

Cyanex 923是一种有机氧化膦类萃取剂,具有萃取容量高,选择性好等特点。介绍了Cyanex923的性质,对Cyanex 923在重金属废水处理、稀土金属和贵金属萃取的应用研究现状进行了综述。

Extraction of Yttrium (Ⅲ) into [C_8 mim][PF_6] Containing Cyanex 923

The extraction of Yttrium (Ⅲ) into [Cnmim][PF6] (n= 4, 6, 8) containing Cyanex 923 was studied in this paper. The mechanism of this extraction was indicated to be cation exchange. In addition, the extraction process is an endothermic reaction. The RTILs with shorter alkyl chain behave higher extraction efficiency during the extraction, however, which has also more loss to aqueous phase since the cation exchange mechanism.

Extraction Kinetics of Lanthanum with Purified Cyanex 923 from Nitrate Medium

Solvent extraction kinetics of lanthanum with purified Cyanex 923 in heptane from nitrate medium was investigated by using a constant interfacial cell with laminar flow at 303 K. The effects of stirring speed, temperature and specific interface on the extraction rate were studied. The experimental results showed that the extraction apparent activation energy was 32.0 kJ\5mol -1 and the extraction process was controlled by both chemical reaction and diffusion. The extraction rates were measured at different chemical compositions by varying ionic strength, pH value and the concentration of purified Cyanex 923. The initial extraction rate equation was obtained.

利用Cyanex 923和离子液体的复合材料分离钇及重稀土

提供了一种固定Cyanex 923的新方法-溶胶-凝胶法。在溶胶-凝胶过程中离子液体的加入增加了复合材料的比表面积和孔容,并在硅胶网络中为Cyanex 923提供了一个可以扩散的介质。包埋离子液体和Cyanex 923的有机-无机复合材料的制备过程不需要其他有机溶剂,绿色、环保。结果表明,该复合材料对Y(Ⅲ)和重稀土元素有较好的分离效果。经过4次萃取/反萃过程,该复合材料对Y(Ⅲ)去除率仍高于78%。表明材料性能稳定,可多次重复使用。

盐酸介质中Cyanex 923浸渍树脂吸附Ga(Ⅲ)的性能研究

以中性氧化膦Cyanex 923(由四种三烷氧基膦组成的混合物)作为萃取剂、非极性苯乙烯—二乙烯基苯大孔吸附树脂(HZ803)为载体制备了Cyanex 923浸渍树脂(SIRs).采用扫描电镜、红外分析、热重分析对制备的浸渍树脂进行了表征.通过静态吸附法考察了盐酸浓度、吸附温度、吸附时间和Ga(Ⅲ)浓度等对该浸渍树脂在盐酸介质中吸附镓(Ⅲ)性能的影响.结果表明,随着盐酸浓度的增加吸附量逐渐增加,在298 K条件下,对Ga(Ⅲ)饱和吸附量为20. 4 mg/g.吸附过程符合拟二级动力学模型,等温吸附曲线符合Langmuir吸附模型.采用0. 01 mol/L的盐酸对吸附在浸渍树脂上的镓进行洗脱,洗脱率为96. 4%. Cyanex 923 SIRs在Ga(Ⅲ)-Al(Ⅲ)与Ga(Ⅲ)-Cu(Ⅱ)二元体系中对Ga(Ⅲ)有较好的吸附选择性.

SEPARATION OF Ce(Ⅳ) AND Th(Ⅳ) FROM RE(Ⅲ) IN HNO_3 SOLUTION BY CYANEX 923 EXTRACTANT

1.IntroductionStraightchainalkylphosphineoxidemixtureCyanex923isonecommercialextractantsdevelopedbyCytecCanadaInc..ComparedwithotherphosphinereagelltsuchasTOPO,theextractatlthajsseveraladvantagesincludinglittleliablehydrolyzation,lowsolubilityinaqueo...

Cyanex 923支撑液膜中锗的迁移:数学建模（英文）

建立一个数学模型,用于监测草酸溶液中锗(IV)穿过含有4种三烷基氧化膦(Cyanex 923)的平板支撑液膜(FSSLM)的促进迁移过程。FSSLM建模是基于由液-液萃取(LLX)模型计算得出的萃取常数(Kext)。LLX模型提供一种可靠的萃取常数计算方法(Kex=2.057×103 L/mol4)。根据萃取常数、Fick定律和扩散原理,利用Matlab软件对FSSLM模型进行求解。该模型预测的总传质系数(Korg)为3.84 cm/s。利用该总传质系数,得出Cyanex 923浓度为0.126、0.252、0.378、0.505、0.631和0.757 mol/L时的扩散系数(Dm)分别为8.50×10^-4、4.30×10^-4、1.87×10^-4、5.87×10^-5、2.57×10^-5和2.09×10^-5cm2/s。结果表明,本研究得出的扩散速率大于大多数类似的FSSLM体系的扩散速率。这些FSSLM体系都含有Cyanex 923,用于迁移各种金属。模型值与实验数据吻合良好,表明该数学模型具有良好的可靠性。

Binary Mixture of Tri-Octyl Amine and Cyanex 923 as Extractant for the Extraction of Zr (IV) from Acidic Chloride Medium

The extraction of zirconium (IV) from aqueous HCl solution by binary mixture TOA and Cyanex 923 using kerosene as diluent was studied. The effect of parameters like aqueous phase acid concentration, extractant concentration, chloride ion concentration, diverse ion effect, metal loading, nature of diluents and temperature on the extraction of Zr (IV) was investigated. The percentage of extraction of Zr(IV) became 100% with 0.1 M TOA and 0.01 M Cyanex 923 from 7 M HCl and also from 4 M HCl with 0.1 M TOA and 0.02 M Cyanex 923. Benzene was found to be effective diluent for the extraction of Zr(IV) with binary mixture of TOA and Cyanex 923. The positive enthalpy change and positive entropy change in the binary extraction system show endothermic process with increase in randomness. Stripping of Zr (IV) from the loaded organic phase containing mixture of TOA (0.1 M) and Cyanex 923 (0.01 M) indicated that HNO3 and Na2CO3 are the best stripping agents.

用Alamine 336,Aliquat 336，TBP和Cyanex 923分离和回收盐酸

K．Sarangi等研究了用Alamine 336，Aliquat 336，TBP和Cyanex 923作萃取剂，煤油作稀释剂，从含有185．42g／L酸的溶液中溶剂萃取盐酸。盐酸萃取率随萃取剂浓度的提高而提高。对于所有萃取剂而言，萃入到有机相中的萃合物都表现为与单分子萃取剂有关。对于Alamine 336，McCabe—Thiele结构表明，在水相与有机相的体积比为1：4条件下，以两段逆流萃取，盐酸萃取率有可能超过99．5％。对于Cyanex923，McCabe—Thiele结构表明，在水相与有机相的体积比为1；5、4段逆流萃取条件下有可能实现盐酸的定量萃取。

Synergistic extraction and separation of thorium from rare earths in chloride media using mixture of Cextrant 230 and Cyanex 923

In order to lower the usage of expensive Cyanex 923 and increase the extraction capacity of the system of Cextrant 230,the synergistic extraction of thorium from chloride media by a mixture of Cextrant 230 and Cyanex 923 was investigated.The maximum synergistic enhancement coefficient(R)of 1.53 is obtained at 1:1 molar ratio of Cextrant 230/Cyanex 923.The syne rgistic extracted species of Th^(4+)is determined as ThCl_(4)·2Cextrant 230·Cyanex 923.The synergistic extraction of Th^(4+)is an entropy-driven exothermic process.The loading capacity of 0.60 mol/L mixed extractant for thorium is about 17.10 g/L(calculated as ThO_(2)),and the loaded thorium in the organic phase can be effectively stripped by distilled water.For comparison,rare earth cations are barely extracted under the similar conditions,suggesting that the mixtures can be applied to separate thorium from rare earths.A cascade extraction process was developed based on the synergistic extraction system to separate thorium from the hydrochloric acid leaching of bastnaesite.The content of thorium in the leaching solution decreases obviously from 19.90 mg/L to1.4μg/L by 3 stages of extraction,which is superior to sole Cextrant 230 or Cyanex 923.The introduction of Cextrant 230 into the extraction system not only lowers the usage of Cyanex 923 but also enhances the selective extraction of thorium at low acidity,implying that the synergistic extraction system can selectively extract thorium more efficiently and economically than the sole systems.

LIX54/Cyanex923从含锂硫酸钠溶液中协同萃取分离锂钠的研究

针对目前废旧电池正极材料湿法回收工艺中锂回收率低和锂钠分离困难等问题,提出了一种可从含锂硫酸钠溶液中选择性提取锂的协同萃取体系LIX54/Cyanex923。实验结果表明,对于含锂0.5 g/L、钠50 g/L的模拟料液,采用0.4 mol/L LIX54+0.2 mol/L Cyanex923+磺化煤油的有机相,在O/A相比1∶1、平衡pH值12.5、温度30℃和时间10 min的条件下锂的单级萃取率达98.72%,βLi/Na可达1578。在相比O/A=1∶5、平衡pH值12.5条件下经三级模拟逆流萃取,99%以上的锂被萃取,萃余液中锂的含量小于0.01 g/L。采用1 mol/L HCl在O/A相比8∶1条件下经过两级逆流洗涤,近98%的钠被洗脱,有机相中仅留下0.05 g/L钠。洗后负载有机相用3 mol/L HCl在相比O/A=6∶1下进行两级逆流反萃,锂的反萃率达99%以上,反萃液中锂的浓度被富集到16.93 g/L。LIX54/Cyanex923协同萃取体系能有效地从含锂硫酸钠溶液中选择性回收锂,实现锂与钠的深度分离及锂的高倍富集回收。

P204-Cyanex923混合溶剂萃取铟

研究了 P2 0 4、P50 7、Cyanex 92 3及 P2 0 4单一体系与 3种中性有机磷萃取剂 (Cyanex 92 3、TRPO、TBP)组成的混合体系对 In( )、Fe( )的萃取和反萃性能 .发现在 P2 0 4中加入 Cyanex92 3使 In( )的萃取率略有下降 ,反萃率提高 .红外光谱分析证明 P2 0 4与 Cyanex 92 3存在缔合作用 ,抑制 P2 0 4与 In( )和 Fe( )的离子交换反应 ,可以提高过程的反萃率 .

Cyanex923萃取稀土(Ⅲ)的传质动力学

利用层流恒界面池 ,研究了在 (30 3± 0 .5 K)下纯化 Cyanex92 3-正庚烷 - Na NO3体系萃取 L a( )、Y( )和 Sm( )的传质动力学。考察了搅拌速度、温度及比界面积对萃取速率的影响。实验表明 ,在硝酸体系中 ,Cyanex92 3萃取 L a( )、Y( )和 Sm( )的正向表观活化能分别为 32 .0 k J· mol- 1、16 .4 k J· m ol- 1和 15 .1k J· m ol- 1 ,L a( )的萃取为混合控制过程 ,Y( )和 Sm( )萃取为扩散控制过程。实验还表明萃取过程的化学反应均发生在液 -液界面上。

β-二酮与CYANEX923或LIX84I混合萃取剂从氨性体系中协同萃锌(英文)

研究β-二酮(HA)与CYANEX923或LIX84I的混合萃取剂在氨性溶液中的萃锌行为;系统讨论有机相萃取剂浓度、水相pH、总氨浓度、温度和阴离子等对萃取性能的影响,从锌萃合物及β-二酮萃取剂结构方面讨论2个混合萃取体系的协同萃取机理。结果表明,HA与CYANEX923混合比与LIX84I混合具有更加明显的协同效应;水相pH和总氨浓度的升高均使萃取性能降低,因为升高pH或氨浓度会促使锌氨配合物的生成,降低水相自由锌离子的浓度,但HA与CYANEX923混合体系在较高pH或总氨浓度下仍具有明显的萃取性能;不同阴离子对HA与CYANEX923混合萃取体系的性能没有明显影响,但在HA与LIX84I混合萃取体系和单独使用HA萃取过程中以(NH4)2SO4>NH4NO3>NH4Cl顺序降低。