Study on the synthesis of high-performance MnO₂·0.5H₂O ion sieve by semi-hydrothermal method for selective lithium extraction from lithium precipitation mother liquor AITranslate

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Chinese Library Classification Number:TQ131.1[化学工程—无机化工]

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The spinel precursor Li_1.6Mn_1.6O₄was synthesized via a solid-state reaction,followed by hydrochloric acid treatment to obtain the lithium-ion sieve MnO₂·0.5H₂O.Physical characterization revealed that both the polycrystalline precursor Li_1.6Mn_1.6O₄and the MnO₂·0.5H₂O ion sieve maintained nearly pure spinel structures,exhibiting high structural stability during the adsorption-desorption process.Calcination at 425℃,with a Li/Mn molar ratio of 1.1,resulted in the lithium-ion sieve MnO₂·0.5H₂O,prepared by acid washing the precursor with 0.1 mol/L hydrochloric acid,achieving an adsorption capacity of up to 34.617 mg/g,with only a 1.49%manganese leaching loss.Its adsorption behavior conformed to the Langmuir isotherm model and pseudo-second-order kinetics model,indicating that the MnO₂·0.5H₂O ion sieve possessed uniform adsorption sites during the Li⁺adsorption process,and that process was characterized as chemical adsorption.In separation experiments using simulated solutions,it was found that the MnO₂·0.5H₂O ion sieve exhibited a high selective adsorption capacity for Li⁺in simulated solutions with high concentrations of Na⁺and K⁺.Therefore,this adsorbent can be effectively applied for Li⁺recovery from lithium precipitation mother liquor.