▎ 摘　　要

NOVELTY - Preparation of lithium ion sieve adsorbent particles involves adding adsorption powder into first polymer solution, mixing to obtain first mixture, soaking first mixture in first crosslinking agent aqueous solution for primary crosslinking to obtain second mixture, granulating second mixture and drying to obtain dried particles, soaking dried particles into second crosslinking agent for secondary crosslinking to obtain lithium ion sieve adsorbent particles, where the boric acid of crosslinking state is hydrolyzed in second crosslinking agent and boric acid is re-dissolved, and releasing hydroxyl group of crosslinking state, where the polyvalent metal ion is stably present in the second crosslinking agent and the second crosslinking agent performs secondary crosslinking with hydroxyl group and/or carboxyl group in first polymer to form stable crosslinked structure. The adsorbent powder is lithium ion sieve adsorbent with particle size of 200-1500 mesh. USE - Preparation of lithium ion sieve adsorbent particles used for extracting liquid lithium resources such as salt lake brine, seawater and underground water. ADVANTAGE - The preparation method is simple, and provides adsorbent particles having high elasticity, porosity and water absorption and excellent permeability. The resin matrix is resistant to strong acid, strong alkali, and high salt environment. The polyhydroxyl structure on the surface of the substrate can effectively adsorb adsorbent particles and effectively reduce dissolution rate. DETAILED DESCRIPTION - Preparation of lithium ion sieve adsorbent particles involves adding adsorption powder into first polymer solution, mixing to obtain first mixture, soaking first mixture in first crosslinking agent aqueous solution for primary crosslinking to obtain second mixture, where during primary crosslinking, the hydroxyl in first polymer is crosslinked with boric acid in first crosslinking agent and carboxyl in first polymer is crosslinked with polyvalent metal ion in first crosslinking agent, granulating second mixture and drying to obtain dried particles, where the drying process is near the distance between polymer molecules, reducing free volume for secondary crosslinking, soaking dried particles into second crosslinking agent for secondary crosslinking to obtain lithium ion sieve adsorbent particles, where during secondary crosslinking process, the boric acid of crosslinking state is hydrolyzed in second crosslinking agent and boric acid is re-dissolved, and releasing hydroxyl group of crosslinking state, where the polyvalent metal ion is stably present in the second crosslinking agent and the second crosslinking agent performs secondary crosslinking with hydroxyl group and/or carboxyl group in first polymer to form stable crosslinked structure, or adding adsorption powder into mixed polymer solution composed of first polymer solution and second polymer solution, mixing to obtain first mixture, immersing first mixture in first crosslinking agent aqueous solution for primary crosslinking to obtain second mixture, granulating second mixture and drying to obtain dried particles, reducing free volume for secondary crosslinking, soaking the dried particles into second crosslinking agent for secondary crosslinking to obtain lithium ion sieve adsorbent particles and releasing hydroxyl group of crosslinking state, or adding adsorption powder into mixed polymer solution composed of first polymer solution, second polymer solution and third polymer solution, mixing to obtain first mixture, immersing first mixture in first crosslinking agent aqueous solution for primary crosslinking to obtain second mixture, granulating second mixture and drying to obtain dried particles, soaking dried particles into second crosslinking agent for secondary crosslinking to obtain lithium ion sieve adsorbent particles and releasing hydroxyl group of crosslinking state. During primary crosslinking process, the hydroxyl in first polymer is crosslinked with boric acid in first crosslinking agent, the carboxyl in first polymer is crosslinked with polyvalent metal ion in first crosslinking agent, the carboxyl in second polymer is crosslinked with polyvalent metal ion in first crosslinking agent, and the carboxyl in third polymer is crosslinked with polyvalent metal ion in first crosslinking agent. The adsorbent powder is lithium ion sieve adsorbent with particle size of 200-1500 mesh.