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Application Research on Transport and Separation for Recovery of Rare Earths Metals with Dispersion Supported Liquid Membrane

Author: PeiLiang
Tutor: YaoBingHua
School: Xi'an University of Technology
Course: Environmental Engineering
Keywords: Liquid membrane separation Dispersion Supported Liquid Rare earth metals Organic phosphate
CLC: X132
Type: PhD thesis
Year: 2010
Downloads: 257
Quote: 1
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Abstract


This article relates to a rare earth metal migration and separation and recovery techniques, mainly studied porous polymer film as the support, an organic phosphoric acid as the mobile carrier, kerosene solvent into a film, a mixed solution of the kerosine and mobile carrier as a membrane solution, the membrane solution and HCl solution dispersed phase dispersion supported liquid membrane (DSLM) in several migration and separation of rare earth metals recycling behavior through the analysis of the mass transfer process, and establish a corresponding mathematical model, and obtained the following results: 1 of 2 - ethylhexyl phosphonic acid - mono-2 - ethylhexyl ester (PC-88A) as the mobile carrier DSLM system of La (III), Ce (IV), Tb (III), Eu (III), Dy (III) and the migration behavior of the Tm (III), the effects of the pH of the feed solution, the initial concentration of the metal ion, the concentration of HCl in the dispersed phase, the film solution and HCl solution volume ratio, different parsing and different carrier concentration of La (Ⅲ ) Ce (IV) Tb (III), Eu (III), Dy (III) and Tm (Ⅲ) migration obtained La (III) Tb (III), Ce (IV) of Eu ( Ⅲ). Dy (Ⅲ) and Tm (Ⅲ) optimal migration conditions were as follows: the dispersed phase concentration of HCl solution to 4.00 mol / L; membrane solution and HCl solution volume were 30:30,40:20,30 : 30,30:30,40:20 and 40:20; carrier concentration were controlled at 0.160 mol / L, 0.160 mol / L, 0.100 mol / L, 0.160 mol / L, 0.100 mol / L and 0.160 mol / L; the pH of the feed solution was 4.00,1.00,5.20,4.20,5.00 and 5.10; under optimal conditions, the feed solution of La (III) of Ce (IV), Tb (III), Eu (III) of Dy ( III) and Tm (Ⅲ) initial concentration of 8.00 × 10-5 mol/L.7.O0 × 10-5 mol/L.1.00 × 10-4mol/L.8.00 × 10-5 mol / L. 8.00 x 10-5 mol / L and 1.00 × 10-4mol / L, respectively, to migrate 125 min.75 min, 95 min, 130 min.95 min and 155 min, migration rates were 93.9%, 96.3%, 95.2% , 95.3%, 96.2% and 92.2%, respectively. 2, 2 - (2 - ethylhexyl) phosphoric acid (D2EHPA) as the mobile carrier DSLM system La (Ⅲ). Ce (Ⅳ). Tb (Ⅲ). Eu (Ⅲ). Dy (Ⅲ) and Tm (III) migration behavior. The effects of the pH of the feed solution, the initial concentration of the metal ion, the dispersed phase HCl concentration, membrane solution HCl solution volume ratio of different analytic and different carrier concentration of Ce (IV), La (III), Tb (III). Eu (III), Dy (III) and Tm (Ⅲ) migration obtained La (III) Tb (III), Ce (IV), Eu (III), Dy (III) and Tm (Ⅲ) Optimal migration conditions were: the dispersed phase concentration of HCl solution to 4.00 mol / l; membrane solution and HCl solution volume ratios 20:40,30:30,30:30,30:30,20:40 and 40 : 20; carrier concentration is controlled in 0.160 mol / L; the feed phase the pH were 5.00,0.50,4.50,5.00,4.50 and 5.00; under optimal conditions, the feed phase La (III), Ce (IV) Tb (III), Eu (III) and Tm (Ⅲ) initial concentration are 1.OOx10-4 mol / L, migration 35 min, La (III), Tb (III), Eu (III) Dy (Ⅲ) and Tm (III) migration rate reached 94.8%, 99.1%, 93.7%, 98.2% and 99.2% of Ce (IV) to migrate for 30 min, the migration rate of 78.3%. The rare earth metal-migration process in the most suitable resolution agent is HCl; Eu (III) of the migration rate increases with increasing ionic strength, and other rare earth metals of the mobility is affected by ionic strength no obvious effect. 3, PC-88A and D2EHPA mixed as a carrier, research the DSLM system of Tb (Ⅲ), Eu (Ⅲ) and Dy (Ⅲ) migration behavior. The effects of HCl concentration of the dispersed phase, membrane solution and HCl solution volume ratio, the pH of the feed solution, the initial concentration of the metal ions, different parsing agent and mixed carrier concentration and the ratio of Tb (Ⅲ), Eu (Ⅲ) and Dy (Ⅲ ) the impact of migration, drawn Tb (III), Eu (III) and Dy (Ⅲ) migration: the dispersed phase concentration of HCl solution were 4.00 mol / L; membrane solution and HCl solution volume ratio respectively 20:40,40:20 and 40:20; film solution PC-88A and D2EHPA concentration are 8.00x10-2 mol / L; feed phase pH were 3.80,4.80 and 3.80; under optimal conditions, Tb (III) in the feed phase, the initial concentration of Eu (III) and Dy (Ⅲ) 1.OO × 10-4 mol / L, 30 min, migration rate reached 95.4%, 94.6% and 97.0 %. 4, in migration studies individual rare earth metals DSLM based on mixed rare earth metals DSLM separation studies, the following results were obtained: (1) PC-88A as the carrier, La (Ⅲ), Ce (Ⅳ) , Tb (III), Eu (III), Dy (III), Tm (III) the misch metal DSLM separation system select the liquid phase acidity of 0.50 mol / L, the HCl concentration in the dispersed phase of 4.00 mol / L, membrane solution and HCl solution volume ratio of 30:30, and the concentration of the carrier PC-88A to study the behavior of the separation of rare earth in DSLM 0.160 mol / L, in this condition, when the concentration of the respective elements are 1.00 × 10-4 mol / L, Ce (IV) in 120min, can be separated and the other rare earth. When adjusting the feed phase, pH 2.80, 300 min, Tb (III), Eu (III), Dy (III) three elements with La (III) of the separation factor were 3.95,4.87 and 6.12; and Tm ( Ⅲ) separation factors were 12.8,15.8 and 19.8. (2) D2EHPA as the carrier, La (III), Tb (III), Eu (III), Dy (III), Tm (III) the mischmetal the DSLM separation system select the feed phase pH 2.80, decentralized phase HCl concentration of 4.00 mol / L, the membrane solution and HCl solution volume ratio of 30:30, the D2EHPA concentration of 0.160 mol / L, to study the behavior of the separation of the rare earth metal in DSLM Under this condition, when the respective metal ion concentration of 1.OOx10-4 mol / L, 80 min, Tb (III), Eu (III), three elements of Dy (III) and La (III) the separation factor were 9.24,4.81 and 1.80; Tm (Ⅲ) separation factors were 64.4,33.5 and 12.6. Tb (Ⅲ) and Eu (Ⅲ) in this condition can be very good with La (III), Dy (III), Tm (III) separation. Adjust the feed phase, pH 2.00, 160 min, Dy (III) and La (III) the separation factor of 23.3; Tm (Ⅲ) separation factor of 102.9. Dy (Ⅲ) in this condition can be very good separation of La (Ⅲ) and Tm (Ⅲ). The mixed solution of La (Ⅲ) and Tm (Ⅲ), adjust the pH of the feed solution 3.00,250 min, La (III) and Tm (Ⅲ) separation factor of 19.1. Under these conditions, La (Ⅲ) Tm (Ⅲ) separation. (3) hybrid carrier, Tb (III), Eu (III), Dy (III) a mischmetal DSLM separation system material liquid phase pH of 2.60 the dispersed phase HCl concentration of 4.00 mol / L, membrane solution and HCl solution volume ratio of 30:30, and the PC-88A in the mixed carrier and D2EHPA concentration was 8.00 × 10-2 mol / L, and under this condition study mischmetal DSLM in separation behavior, when each rare earth metals initial concentration of 1.00 × 10-4 mol / L, 80min, Tb (III), Dy (III) and Eu (Ⅲ) separation factor were 24.2 and 10.7; Tb (III) and Dy ( Ⅲ) separation factor of 2.26. Tb (Ⅲ) and Dy (Ⅲ) in this condition with Eu (Ⅲ) separation. Adjust the feed phase, pH 2.00, 80 min, Eu (III), Dy (III) and Tb (Ⅲ) separation factor of 28.9 and 19.1. Under these conditions, Eu (Ⅲ), Dy (Ⅲ) separation and Tb (Ⅲ). By mass transfer analysis of hydrogen ions in the feed phase and the dispersed phase rare earth metals the driving force through DSLM migration: the migration experiments show that the migration behavior of rare earth metals in DSLM macro with a series of reaction kinetics characteristics deduced rare earth through DSLM migration rate equation, Rf, Rm and Rs quasi-an apparent rate constant k1 and k2 relationship and rare earth metal ions migrate flux equation to obtain rare earth metals by DSLM migration kinetic parameters k1 the k2, tmax, Rmmax, Jfmax and Jsmax. Explore the mechanism through the membrane mass transfer process, the establishment of the rare earth metals in the DSLM mass transfer kinetics equation to calculate the permeability coefficient equation rare earth by DSLM migration kinetic parameters Af △ m, df Dm rare earth, verified by experiment, the equation is more consistent with the experimental results.

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CLC: > Environmental science, safety science > The basic theory for the Environment and Science > Environmental Chemistry > Environmental Analytical Chemistry
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