Magnetic nano lithium ion sieve adsorbent and preparation method thereof

Abstract

The invention discloses a magnetic nano lithium ion sieve adsorbent and a preparation method thereof. The magnetic nano lithium ion sieve is a Fe3O4 / LixMnyO4 shell structure in which nano Fe3O4 superparamagnetic material is used as a kernel and nano lithium-manganese oxide lithium ion sieve film is used as a shell, wherein the ratio x / y is between 0.5 and 1.5. The preparation method comprises the following steps of: synthesizing Fe3O4 / MnCO3+Li2CO3 gel particles at a time by use of a self-developed narrow-channel impact flow reactor; and performing water heating, leaching, drying, baking and acid leaching to obtain the product of magnetic nano lithium ion sieve adsorbent. According to the invention, the synthesized magnetic nano lithium ion sieve has the advantages of high specific surface area, high dispersity, high absorption / desorption rate, quick recovery and the like, and is particularly suitable for the process of large-scale lithium extraction from a dilute lithium solution; the absorption / desorption performance of the lithium ion sieve can be remarkably improved, and the dissolution loss rate of the lithium ion sieve is reduced; and moreover, the preparation method of the magnetic nano lithium ion sieve has simple technology, large yield and low cost, and can be magnified to a large scale easily.

Description

technical field [0001] The invention relates to a lithium ion sieve, in particular to a magnetic nanometer lithium ion sieve capable of rapidly extracting lithium ions from an aqueous solution and rapidly separating them from the aqueous solution under the action of a magnetic field force and a preparation method thereof. Background technique [0002] Lithium is an important strategic material for the national economy and national defense construction, and has the reputation of "the energy metal that promotes the progress of the world". Lithium alloys are used in the manufacture of aerospace vehicles, lithium batteries are power sources for mobile communication devices and plug-in electric vehicles, liquid metal lithium is an ideal heat carrier for nuclear reactors, lithium compounds are the best solid rocket fuels, and lithium-based lubricants are widely used Lubrication of auto parts. In recent years, with the global demand for lithium batteries growing at an annual rate ...

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Problems solved by technology

[0005] Lithium ion sieve is in powder form, and the adsorption and desorption process cannot be directly operated by columns. Usually, polyvinyl chloride, polyacrylamide and other organic or inorganic binders are added to the lithium ion sieve powder for granulation. After granulation, the specific surface area is significantly reduced. , the exchange performance is significantly worse, so that the lithium ion exchange and adsorption of lithium ion sieves in seawater are significantly reduced

[0006] The patent publication number is CN101342479 Chinese patent "Preparation Method of Three-Dimensional Ordered Macroporous (3DOM) Titanium Oxide "Lithium Ion Sieve"", the method synthesizes polymethyl methacrylate colloidal crystal template, and uses lithium salt and titanium The precursor solution is filled with a colloidal crystal template, and after suction filtration, drying, two-stage constant temperature roasting, acid leaching and re-drying, a 3DOM titanium oxide "lithium ion sieve" is obtained. This invention significantly improves the ion sieve material by controlling the 3DOM structure of the material The ratio of the active adsorption phase strengthens the internal diffusion capacity in ion transfer, and it is a dual-channel functional material with both macropores and micropores, but there are still obvious shortcomings in further improving the adsorption rate and exchange performance of lithium ion sieves.

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