Study on Li+ adsorption performance using PVC-H1.6Mn1.6O4 film in lithium-rich aluminum electrolyte

Abstract

With the explosion of the lithium-ion battery market, the requirement for lithium resources is growing promptly, even though traditional lithium extraction methods are inefficient and research focuses on lithium extraction from brines, efficiently extracting lithium from lithium-rich aluminum electrolytes (LRAE) is crucial. This study explores a novel approach to recover lithium from lithium-containing aluminum electrolytes through hydrochloric acid dissolution and ion-exchange adsorption, aiming to achieve high-value use of hazardous waste. The research examines the influence of various parameters-covering the effects of factors such as hydrochloric acid concentration, reaction time, reaction temperature, and liquid-solid ratio. Including the important role of these factors in the reaction process and outcome, as well as their impact on the entire process. The dissolution rate via hydrochloric acid dissolution. A dissolution efficiency of approximately 76.48 % for lithium was achieved within 90 min using a 2 mol/L hydrochloric acid solution at a temperature of 75 °C, while maintaining a liquid-to-solid ratio of 45:1. Additionally, polymer-loaded PVC-H_1.6Mn_1.6O₄ films were synthesized through a hydrothermal reaction utilizing the dissolution solution as the precursor. The optimal adsorption performance of the PVC-H_1.6Mn_1.6O₄ film was observed at mass concentration of 12 % for both PVC and the precursor. The adsorption equilibrium was attained after 480 min, resulting in a lithium ion adsorption capacity of 381.82 mg/m². After five cycles of adsorption experiments, the lithium adsorption ability of the PVC-H_1.6Mn_1.6O₄ film in lithium-rich aluminum electrolyte solutions was determined to be 96.80 %, indicating a decrease of 3.20 % compared to the initial lithium adsorption.