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Distributed in the supported liquid membrane separation and recovery of rare earth metals
Time:06/15/2011

  Distributed in the supported liquid membrane separation and recovery of rare earth metals

  This involves the migration and separation of a rare earth metal recovery technology, mainly to study the porous polymer membrane as the support body, the organic phosphoric acid as mobile carrier, kerosene as membrane solvent, kerosene, and the mixed solution as a mobile carrier membrane solution, the membrane solution and HCl solution, the dispersion of the dispersed phase composition of supported liquid membrane (DSLM) the migration of several rare earth metals and the separation and recovery behavior, mass transfer process through the analysis of the corresponding mathematical model, achieved the following results:

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Tel:0086-592-5781916
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  1, using 2 - ethylhexyl phosphonic acid - Single -2-- ethylhexyl ester (PC-88A) as the mobile carrier DSLM system of La (Ⅲ), Ce (Ⅳ), Tb (Ⅲ), Eu (Ⅲ ), Dy (Ⅲ) and Tm (Ⅲ) the migration behavior was studied. The effects of feed phase pH, initial metal ion concentration of the dispersed phase HCl concentration, the membrane solution and HCl solution volume ratio of different agents and different analytical carrier concentration of La (Ⅲ). Ce (IV). Tb (Ⅲ). Eu (Ⅲ). Dy (Ⅲ) and Tm (Ⅲ) migration, obtained La (Ⅲ). Ce (IV). Tb (Ⅲ). Eu (Ⅲ). Dy (Ⅲ) and Tm (Ⅲ) were the optimal conditions for migration: the dispersed phase concentration of HCl solution are as 4.00 mol / L; membrane solution and HCl solution volume ratios of 30:30 , 40:20,30:30,30:30,40:20 and 40:20; carrier concentration 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; feed phase pH were 4.00,1.00,5.20,4.20,5.00 and 5.10; in optimal conditions, the material liquid La (Ⅲ). Ce (Ⅳ), Tb (Ⅲ), Eu (Ⅲ). Dy (Ⅲ) and Tm (Ⅲ) The initial concentrations were 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 × 10-5 mol / L and 1.00 × 10-4mol / L, respectively, migrated 125 min.75 min, 95 min, 130 min.95 min and 155 min, 93.9%, respectively mobility , 96.3%, 95.2%, 95.3%, 96.2% and 92.2%.

  2, using the two - (2 - ethylhexyl) phosphoric acid (D2EHPA) as the mobile carrier DSLM system of La (Ⅲ). Ce (Ⅳ). Tb (Ⅲ). Eu (Ⅲ). Dy (Ⅲ) and Tm (Ⅲ) the migration behavior was studied. The effects of feed phase pH, initial metal ion concentration of the dispersed phase HCl concentration, the membrane solution and HCl solution volume ratio of different agents and different carrier concentrations on the analytical La (Ⅲ). Ce (Ⅳ). Tb (Ⅲ). Eu (Ⅲ). Dy (III) and Tm (Ⅲ) migration, obtained La (Ⅲ). Ce (IV). Tb (Ⅲ). Eu (Ⅲ). Dy (Ⅲ) and Tm (Ⅲ) optimal transfer conditions were: concentration of the dispersed phase in the HCl solution are all 4.00mol / L; membrane volume ratio of solution and HCl solution and 40, respectively 20:40,30:30,30:30,30:30,20:40 : 20; carrier concentration are controlled at 0.160 mol / L; feed phase pH were 5.00,0.50,4.50,5.00,4.50 and 5.00; in optimal conditions, the material liquid La (Ⅲ), Ce (Ⅳ) , Tb (Ⅲ), Eu (Ⅲ) and Tm (Ⅲ) are the initial concentration of 1.OOx10-4 mol / L, the migration of 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%, Ce (Ⅳ) transfer 30 min, migration rate of 78.3%. Rare earth metal migration process, the most suitable resolution agent is HCl; Eu (Ⅲ) migration rate with the increase of ionic strength, the rate of migration of other rare earth ionic strength is not obvious.

  3, PC-88A and D2EHPA as the carrier mixture, the study DSLM system Tb (Ⅲ), Eu (Ⅲ) and Dy (Ⅲ) migration behavior. The effects of the dispersed phase HCl concentration, the membrane solution and HCl solution volume ratio of feed phase pH, initial concentration of metal ions, different analytical agent and the carrier concentration and the ratio of mixed Tb (Ⅲ), Eu (Ⅲ) and Dy (Ⅲ ) migration, obtained Tb (Ⅲ), Eu (Ⅲ) and Dy (Ⅲ) in the best conditions for migration: the dispersed phase concentration of HCl solution were 4.00mol / L; membrane solution and HCl solution volume ratios to 20:40,40:20 and 40:20; membrane solution PC-88A and D2EHPA concentration was 8.00x10-2 mol / L; feed phase pH 3.80,4.80 and 3.80, respectively; under optimal conditions, feed liquid Tb (Ⅲ), Eu (Ⅲ) and Dy (Ⅲ) are the initial concentration was 1.OO × 10-4 mol / L when, 30 min, migration rates were 95.4%, 94.6% and 97.0 %.

  4, in the migration of individual rare earth metals were DSLM study based on the separation of mixed rare earth metals were DSLM study achieved the following results:

  (1) PC-88A as a carrier, in the La (Ⅲ), Ce (Ⅳ), Tb (Ⅲ), Eu (III), Dy (Ⅲ), Tm (Ⅲ) mixed rare earth DSLM liquid separation system of choice phase acidity of 0.50 mol / L, the concentration of the dispersed phase HCl 4.00 mol / L, membrane solution and HCl solution volume ratio of 30:30, vector PC-88A concentration of 0.160 mol / L while in this condition of the earth The separation of metals in DSLM behavior when the concentration of each element are 1.00 × 10-4 mol / L when, Ce (Ⅳ) in 120min, you can with other rare earth separation. When adjusting the pH to 2.80 when the feed phase, 300 min time, Tb (Ⅲ), Eu (Ⅲ), Dy (Ⅲ) three elements and La (Ⅲ) the separation factors 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, in the La (Ⅲ), Tb (III), Eu (Ⅲ), Dy (Ⅲ), Tm (Ⅲ) mixed rare earth DSLM feed phase separation system of choice for the 2.80 pH, dispersion phase HCl concentration of 4.00 mol / L, membrane solution and HCl solution volume ratio of 30:30, D2EHPA concentration of 0.160 mol / L, in the study of this condition in the separation of rare earth metals in the DSLM behavior, when the metal ions concentration was 1.OOx10-4 mol / L when, 80 min time, Tb (Ⅲ), Eu (Ⅲ), Dy (Ⅲ) three elements and La (Ⅲ) the separation factors were 9.24,4.81 and 1.80; and Tm (Ⅲ) the 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. Feed phase pH adjusted to 2.00, 160 min, Dy (Ⅲ) and La (Ⅲ) the separation factor of 23.3; and Tm (Ⅲ) the separation factor of 102.9. Dy (Ⅲ) in this condition can be very good with La (Ⅲ) and Tm (Ⅲ) separation. La (Ⅲ) and Tm (Ⅲ) in the mixed solution, adjust pH of feed solution was 3.00,250 min, La (III) and Tm (Ⅲ) the separation factor of 19.1. La (Ⅲ) in this condition can be very good and Tm (Ⅲ) separation.

  (3) hybrid vehicle, in the Tb (III), Eu (Ⅲ), Dy (Ⅲ) mixed rare earth DSLM feed phase separation system of choice for the 2.60 pH, dispersed in the HCl concentration 4.00 mol / L, membrane solution and HCl solution volume ratio of 30:30, mixed support in the PC-88A and D2EHPA concentration was 8.00 × 10-2 mol / L when mixed in this condition of separation of rare earth metals in the DSLM in behavior when the initial concentration of rare earth metals are 1.00 × 10-4 mol / L when, 80min time, Tb (Ⅲ), Dy (Ⅲ) and Eu (Ⅲ) the separation factors were 24.2 and 10.7; Tb (Ⅲ) and Dy ( Ⅲ) The separation factor was 2.26. Tb (Ⅲ) and Dy (Ⅲ) in this condition can be very good and Eu (Ⅲ) separation. Feed phase pH adjusted to 2.00, 80 min time, Eu (Ⅲ), Dy (Ⅲ) and Tb (Ⅲ) the separation factors were 28.9 and 19.1. Eu (Ⅲ), Dy (Ⅲ) in this condition with Tb (Ⅲ) separation.

  5, by mass, it is proved in the feed phase and the dispersed phase is a rare earth metal hydrogen ions migrate through the DSLM the driving force: migration experiments show that the migration of rare earth metals in the DSLM behavior in a series of macro-kinetic characteristics of rare earth metals is derived rate equation migration through DSLM, Rf, Rm and Rs with the pseudo-first rate constants k1 and k2 the apparent relationship between the flux and the rare earth ion mobility equation, kinetic parameters of rare earth metals migrate through DSLM k1, k2, tmax, Rmmax, Jfmax and Jsmax. Mass transfer through the film to explore the mechanism established in the rare earth metal mass in DSLM dynamic equations to calculate the kinetic parameters of rare earth metals migrate through DSLM Af, △ m, df, and Dm, the permeability coefficients equation by rare earth metals, The experiment results are consistent with the experimental results equation.