Ion separation solar evaporator and preparation method thereof

Through the solar-powered ion separation solar evaporator, the nanofiltration membrane and multi-layer structure design of magnesium-lithium separation is used to achieve efficient and selective separation of Mg2+ and Li+ in salt lake water, solving the problems of high energy consumption and pretreatment in the existing technology, and realizing the direct collection of lithium salts, providing an environmentally friendly and economical lithium resource development solution.

CN120136220APending Publication Date: 2025-06-13SUZHOU UNIV
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Patent Information

Application Number
CN202510630326.0
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-05-16
Publication Date
2025-06-13

AI Technical Summary

Technical Problem

The existing technology has high energy consumption during the lithium extraction process of salt lakes, requires pretreatment of salt lake water, and cannot achieve direct collection of lithium salts, which limits the large-scale application of membrane separation technology in the development of lithium resources in salt lakes.

Method used

A solar-driven ion separation solar evaporator is used to achieve efficient selective separation of Mg2+ and Li+ through stacked transmission channels, ion separation layers, capillary layers and water evaporation zones. The device is made of two-dimensional layered material, composite surface plasmon material, rheology regulator and hydrogel. The ion separation layer uses a magnesium-lithium separation nanofiltration membrane.

Benefits of technology

It has achieved efficient and selective separation of Mg2+ and Li+ in salt lake brine, breaking through the high-energy bottleneck of the traditional nanofiltration membrane lithium extraction process, no need to pretreat the salt lake water, and can directly collect lithium-containing salts, simplifying the subsequent processing process, and providing an environmentally friendly, cost-effective solution for the development of lithium resources in salt lakes.

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Abstract

The invention discloses an ion separation solar evaporator and a preparation method thereof, and belongs to the technical field of magnesium-lithium separation. The ion separation solar evaporator comprises a transmission channel made of a two-dimensional layered material, an ion separation nanofiltration membrane, a capillary layer made of hydrogel and a water evaporation area made of a two-dimensional layered material composite surface plasmon material which are sequentially stacked, and a salt crystallization region made of a two-dimensional layered material composite rheology modifier is arranged around the water evaporation region. According to the invention, efficient selective separation of magnesium and lithium in salt lake brine / seawater is realized through a solar-driven nanofiltration membrane separation technology, the bottleneck of high energy consumption of a traditional lithium extraction process based on a nanofiltration membrane is broken through, and the salt lake brine does not need to be pretreated. In addition, lithium-containing salt can be directly collected, the subsequent treatment process is greatly simplified, and an environment-friendly, economical and efficient solution is provided for development of salt lake lithium resources.
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