CN-121992228-A - Efficient terbium recycling method based on pore-throat microchannel

Abstract

The invention discloses a high-efficiency terbium recovery method based on a pore-throat microchannel, which comprises the steps of mixing an extractant P507, kerosene and Cyanex 272 to obtain an organic phase, taking a terbium lanthanum cerium ion mixed solution as a water phase, and carrying out extraction separation of terbium ions under the condition of high water-oil phase by using a serial pore-throat microchannel. By regulating and controlling the volume ratio, flow, initial acidity of water phase, temperature, phase ratio, initial ion concentration and other key parameters, the terbium and lanthanum cerium in the mixed system are separated selectively. Experimental results show that terbium lanthanum, terbium cerium separation coefficients in the mixed system respectively reach 103.28 and 21.33, and terbium ion extraction efficiency is 90.75%, which shows mass transfer strengthening effect brought by pore-throat structure. The method provides a complete technical path for the diversified separation of terbium resources in a high-phase-ratio system, and has the advantages of simplicity and convenience in operation, remarkable mass transfer strengthening effect, large industrialization potential and the like.

Inventors

• GE XUEHUI
• LI LILIN

Assignees

• 福州大学

Dates

Publication Date

20260508

Application Date

20260211

Claims (7)

1. 1. A terbium efficient recovery method based on a pore throat microchannel is characterized by comprising the following steps: (1) Dissolving terbium chloride hexahydrate, lanthanum chloride heptahydrate and cerium chloride heptahydrate in deionized water, and regulating the pH to be acidic to obtain terbium lanthanum cerium ion mixed solution with the final concentration of 50-200 mg/L as a water phase; (2) Mixing extractant P507, kerosene and Cyanex 272 to obtain an organic phase; (3) And (3) extracting the aqueous phase obtained in the step (1) and the organic phase obtained in the step (2) at normal temperature through serially connected pore-throat microchannels with a certain volume flow, leading the fluid into a separating funnel through the outlet of the pore-throat microchannels connected with a polytetrafluoroethylene tube, and completely detecting the ion concentration in the raffinate in a layering manner.
2. 2. The recovery method according to claim 1, wherein the pH in the step (1) is in the range of 0.7 to 3.5.
3. 3. The recovery method according to claim 1, wherein the amount of extractant P507 in the step (2) is 30 to 80% by volume of the oil phase, the amount of Cyanex 272 is 5 to 10% by volume of the oil phase, and the balance is kerosene.
4. 4. The method of claim 1, wherein the ratio of the aqueous phase to the organic phase in the step (3) is 10:1 to 50:1.
5. 5. The recycling method according to claim 1, wherein the certain volume flow in the step (3) is 1000 to 3000. Mu.l/min and 60 to 300. Mu.l/min, respectively.
6. 6. The recovery method according to claim 1, wherein the extraction time in the step (3) is 9.0 to 112.9 s.
7. 7. The recovery method according to claim 1, wherein the structure of the tandem pore throat microchannel in the step (3) comprises a front part, a middle part and a rear part, wherein the front part is a T-shaped microchannel, two ports of the front part are respectively inlets of the aqueous phase and the organic phase, the other port is connected with one port of the middle part through a throat, the other port of the middle part is connected with one port of the rear part through the throat, and the other port of the rear part is an extraction phase and a raffinate phase outlet.

Description

Efficient terbium recycling method based on pore-throat microchannel Technical Field The invention belongs to the technical field of separation and purification in chemical processes, and particularly relates to a terbium efficient recovery method based on a pore-throat microchannel. Background Currently, aiming at the problems of high production cost, complex process flow, severe equipment requirements and the like of the conventional terbium recovery process, the efficient separation and purification of terbium are difficult to realize. Even though hydrometallurgy and solvent extraction means in the hydrometallurgy are adopted as the preferred technology, obvious defects exist, namely, the traditional solvent extraction always needs multistage serial operation to realize the sufficient recovery of terbium, so that the consumption of extractant is large, the process flow is complicated, and the operation difficulty and the treatment load are far higher than those of the conventional scene in the actual treatment process. Currently, the related research on efficient recovery of terbium-pure compounds in the prior art is still limited. Therefore, a new environment-friendly, efficient and feasible pure terbium compound recovery process is developed, the bottleneck of the prior art is broken, and important research value and practical application significance are achieved for relieving terbium resource shortage pressure and reducing application cost. Disclosure of Invention The invention aims to provide a terbium high-efficiency recovery method based on a pore-throat microchannel, which utilizes a serial pore-throat microchannel to extract and separate terbium element under a high-phase system (R is more than 10:1) so as to solve the problem of poor separation selectivity of terbium and lanthanum cerium in a mixed element system and provide a high-efficiency technical path for separation and recovery of rare noble metals. In order to achieve the above purpose, the present invention adopts the following technical scheme: a terbium efficient recovery method based on a pore throat microchannel comprises the following steps: (1) Dissolving terbium chloride hexahydrate, lanthanum chloride heptahydrate and cerium chloride heptahydrate in deionized water, and regulating the pH to be acidic to obtain terbium lanthanum cerium ion mixed solution with the final concentration of 50-200 mg/L as a water phase; (2) Mixing extractant P507, kerosene and Cyanex 272 to obtain an organic phase; (3) And (3) extracting the aqueous phase obtained in the step (1) and the organic phase obtained in the step (2) at normal temperature through serially connected pore-throat microchannels with a certain volume flow, leading the fluid into a separating funnel through the outlet of the pore-throat microchannels connected with a polytetrafluoroethylene tube, and completely detecting the ion concentration in the raffinate in a layering manner. Further, in the step (1), the pH is in a range of 0.7 to 3.5. Further, in the step (2), the amount of the extractant P507 is 30-80% of the volume of the oil phase, the amount of the Cyanex 272 is 5-10% of the volume of the oil phase, and the balance is kerosene. Further, in the step (3), the ratio of water to oil of the aqueous phase to that of the organic phase is 10:1-50:1. Further, the certain volume flow rate in the step (3) is 1000-3000 μl/min and 60-300 μl/min respectively. Further, the extraction time in the step (3) is 9.0-112.9 s. Further, the structure of the tandem pore throat microchannel in the step (3) comprises a front part, a middle part and a rear part, wherein the front part is a T-shaped microchannel, two ports of the T-shaped microchannel are inlets of a water phase and an organic phase respectively, the other port is connected with one port of the middle part through a throat, the other port of the middle part is connected with one port of the rear part through the throat, and the other port of the rear part is an extraction phase outlet and a raffinate phase outlet. The invention has the beneficial effects that: According to the invention, the efficient extraction and separation of terbium ions are realized under the condition of high water oil phase by serially connected micro-channels with pore throat structures. By regulating and controlling the volume ratio, flow, initial acidity of water phase, temperature, phase ratio, initial ion concentration and other key parameters, the efficient selective separation of terbium and lanthanum and cerium in terbium-lanthanum-cerium mixed system is realized. Experimental results show that terbium lanthanum, terbium cerium separation coefficients in the mixed system respectively reach 103.28 and 21.33, and terbium ion extraction efficiency is 90.75%, which shows mass transfer strengthening effect brought by pore-throat structure. The method provides a complete technical path for the diversified separation of terbium resources in a high-phase-r