Method for extracting rare-earth elements through micro channels

A technology of rare earth elements and micro-channels, applied in the field of hydrometallurgy, can solve the problems of long mixing time, large footprint, and low safety, and achieve single-stage extraction rate improvement, small equipment footprint, and improved safety Effect

Inactive Publication Date: 2015-12-02
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the problems of long mixing time, large floor area, low safety and high energy consumption in traditional solvent extraction equipment, the present invention proposes a microchannel extraction method for rare earth elements

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The method for extracting rare earth elements through microchannels, the specific steps are as follows:

[0022] (1) First, add P204 to 260 at a volume ratio of 10:3 # Solvent oil diluent obtains organic phase; Organic phase is saponification organic phase, carries out saponification with the NaOH of 3mol / L, and its degree of saponification is 40%;

[0023] (2) The rare earth salt solution is used as the water phase, and the organic phase and the water phase in step (1) are compared at a ratio of 1:1, and the ratio is 8.33×10 -10 m 3 The volume flow rate of / s passes through the microchannel of the microreactor (Y-Y type double fan-shaped cross-section microchannel, 160μm wide, 40μm high, and 120mm long) for normal temperature extraction, and finally obtains the rare earth element-containing extraction phase and raffinate, of which the rare earth element The salt solution is 0.2mol / L LaCl 3 solution, the pH of the solution was adjusted to 4 with dilute hydrochloric a...

Embodiment 2

[0026] The method for extracting rare earth elements through microchannels, the specific steps are as follows:

[0027] (1) First, add P204 to 260 at a volume ratio of 3:10 # Solvent oil diluent obtains organic phase; Organic phase is saponified organic phase, carries out saponification with the NaOH of 3mol / L, and its degree of saponification is 60%;

[0028] (2) The rare earth salt solution is used as the water phase, and the organic phase in step (1) is compared with the water phase at a ratio of 1:1, with a ratio of 5.55×10 -10 m 3 / s volume flow rate through the microchannel of the microreactor (Y-shaped rectangular microchannel, width 100μm, height 120μm, length 200mm) for normal temperature extraction, and finally obtain the rare earth element-containing extraction phase and raffinate, in which the rare earth salt solution is 0.001mol / L NdCl 3 solution, the pH of the solution was adjusted to 3 with dilute hydrochloric acid.

[0029] In this embodiment, the Nd extrac...

Embodiment 3

[0031] The method for extracting rare earth elements through microchannels, the specific steps are as follows:

[0032] (1) First, add P507 to 260 at a volume ratio of 8:3 # Solvent naphtha diluent obtains organic phase; Organic phase is non-saponifiable organic phase;

[0033] (2) The rare earth salt solution is used as the water phase, and the organic phase and the water phase in step (1) are compared at a ratio of 2:1, and the ratio is 8.33×10 -9 m 3 The volume flow rate of / s passes through the microchannel (interdigitated microchannel) of the microreactor for normal temperature extraction, and finally obtains the rare earth element-containing extract phase and raffinate, wherein the rare earth salt solution is 0.5mol / L Eu(NO 3 ) 3 solution, the pH of the solution was adjusted to 2 with dilute hydrochloric acid.

[0034] In this example, the Eu extraction rate can reach 99.10%, and the extraction equilibrium time is 1.87s.

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Abstract

The invention relates to a method for extracting rare-earth elements through micro channels, and belongs to the technical field of hydrometallurgy. The method comprises the steps that firstly, P507 or P204 is added into 260# solvent oil diluents according to the volume ratio of 3:10-10:3 to obtain an organic phase; a rare-earth salt solution serves as a water phase; the organic phase and the water phase are subjected to normal-temperature extraction through the micro channels in a microreactor according to the phase ratio of 5:1-1:5 and at the volume flowing speed of 5.55*10-10-4.17*10-8 m<3> / s; and finally, an extraction phase containing rare-earth elements and raffinate are obtained. In combination with the advantages that the micro channels are high in specific interfacial area, high in mass transfer rate, short in response time and the like, the purpose of achieving high-efficiency rare-earth extraction is realized through contact of two phase interfaces in the micro channels, and the method is safe, efficient and low in consumption.

Description

technical field [0001] The invention relates to a method for extracting rare earth elements through a microchannel, belonging to the technical field of hydrometallurgy. Background technique [0002] my country is very rich in rare earth resources, not only has a large reserve, ranking first in the world, but also has a complete variety; at the same time, rare earth elements are widely used in metallurgy, glass, ceramics, chemical industry, nuclear industry, electronics industry, agriculture and medicine. At present, solvent extraction, ion exchange chromatography, and extraction resin chromatography are mainly used in rare earth extraction and separation processes, among which solvent extraction is widely used. The mixing-settling tank is the most commonly used extraction equipment in solvent extraction, which has disadvantages such as long mixing time, large floor space, low safety, and high energy consumption. [0003] Microchannel reactor refers to a special microfabrica...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B3/26C22B59/00
CPCY02P10/20
Inventor 尹少华张利波彭金辉李世伟谢峰郭胜惠周俊文代林晴许磊
Owner KUNMING UNIV OF SCI & TECH
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