Lithium adsorbent and preparation method therefor

Abstract

Disclosed in the present disclosure are a lithium adsorbent and a preparation method therefor. The lithium adsorbent has a porous structure, and includes an aluminum-based lithium adsorbent active material and a hydrophilic binder; and the lithium adsorbent has an average pore diameter ranging from 1 nm to 10 nm, a pore volume ranging from 0.65 ml/g to 0.8 ml/g, and a specific surface area ranging from 400 m/g to 600 m/g. The lithium adsorbent of the present disclosure has a specific average pore size ranging from 1 nm to 10 nm, lithium ions have a diameter of 0.3 nm, and the pore size of the lithium adsorbent of the present disclosure is three times or more greater than the diameter of the ions so that the lithium ions can quickly enter and exit pores. Therefore, the structure can ensure high adsorption efficiency and high desorption efficiency at a high flow rate, and allows desorption to be more concentrated than that of a general lithium adsorbent to reduce tailing, and can effectively improve the lithium production efficiency. Moreover, the product of the present disclosure has a pore size of less than 10 nm, allowing the lithium adsorbent to have a low dissolution loss rate and a long service life, and the lithium adsorbent of the present disclosure still has high adsorption efficiency and high desorption efficiency after 1000 cycles of adsorption and desorption.