Solvent extraction of In3+ with microreactor from leachant containing Fe2+ and Zn2+

Abstract

The microreactor has been developed for a wide range of applications because of many advantages, such as high mass transfer efficiency, low energy consumption and the closed and safe system. The application of microreactors in the traditional hydrometallurgy extraction process is expected to overcome difficulties such as coextraction of impurities, large consumption of extractant and hidden fire risks. In this study, the extraction and separation efficiency of In 3+ from a complex sulfate solution containing impurities, such as Fe 2+ and Zn 2+ , were studied. The microreactor extraction was carried out in a Pyrex microchip, and the organic phase was prepared with the extractant di(2-ethylhexyl) phosphoric acid (D2EHPA) diluted in 260# kerosene. The results showed that with only 0.55 s contact between the organic and aqueous phases, the extraction ratio of In 3+ can reach 90.80%, while only 0.16% of Fe 2+ and 0.22% of Zn 2+ were co-extracted; the average mass transfer speed of In 3+ was calculated as high as 0.34 g·m -2 ·s -1 . Compared with the traditional mixing settler process, microreactor extraction has advantages of higher extraction ratio of In 3+ , lower trend of co-extraction of the impurities and emulsification.

Modeling of kinetics of a microfluidic reaction–extraction process for the preparation of KH 2 PO 4

“…Among them, liquid-liquid extraction is one of the important and significant applications, such as aqueous two-phase (ATP) extraction [12,13], acid extraction [14,15], and hydrometallurgy extraction [16,17]. It is reasonable to anticipate that microfluidics can facilitate the fundamental study on the mass transfer and reaction rules in the preparation of KH 2 PO 4 using the extraction method, with unique features including continuous-flow operation, excellent mass and heat transfer performance, and precise control over process conditions.…”

Co and Ni extraction and separation in segmented micro-flow using a coiled flow inverter

“…Liquid-liquid extraction, including mixing and phase separation, especially benefits from such microflow systems as mass transfer is rapidly completed by the short diffusion distances and effective convection, chemical reactions are significantly accelerated by large interfacial areas, and excellent phase separation performance is achieved by surface tension over inertial and gravitational force [19,20]. Many investigations of extraction metal ions and organic compounds using different kinds of microreactors have been conducted as an significant alternative to conventional macro processes [21][22][23][24][25][26][27]. It demonstrates several advantages of microflow extraction, such as improved extraction and separation efficiency, high selectivity of target solutes, shortened extraction time, reduced reagent consumption, "numbering-up" parallel processing, excellent separation of two phases without formation of particle-stabilised emulsions (crud), and so on.…”

Preparation of a Durable CuO/ZnO/CeO2/ZrO2 Catalyst on an SiC Support by an Inverse Microemulsion/Precipitation Method for Methanol Steam Reforming

“…[5,6] MSR is typically performed on reactors, among which microreactors are expected for the application in hydrogen fuel vehicles owing to their compact size, high mass transfer efficiency, short response time, and excellent security features. [7,8] Particularly, porous ceramics with high specific surface area, outstanding stability, and controlled pore structure also serve as reaction microchannels for MSR, which can be regarded as an exceptional microreactor. [9] Moreno et al [10] and Wang et al [11] employed γ-Al 2 O 3 and SiC honeycomb ceramics as reaction microchannels in MSR to enhance energy con-version efficiency, respectively.…”