Sustainable Mining and Metallurgy

The adsorption performance of manganese based adsorbents for low-grade Li+ in Sichuan Zigong underground brine was studied by static and dynamic adsorption and desorption experiments. The results show that the adsorption capacity of the adsorbent for low-graded Li+ in brine increases with the increase of pH value, and the dissolution loss of manganese is the smallest when the pH value is about 7. The temperature has little effect on the adsorption effect, and the adsorbent has a good adsorption effect at room temperature. With the prolongation of time, the adsorption capacity increased, and the adsorption reached equilibrium at 2h, and the adsorption capacity reached 7.85mg/g; the adsorption process conforms to the pseudo-second-order kinetic model and the Langmuir isothermal adsorption model of monolayer adsorption, and has good adsorption selectivity and stability for Li+. After desorption with 0.08mol/L sulfuric acid for 2h, the desorption rate of the adsorbent reached 96%. In the dynamic adsorption process, the adsorption efficiency of the adsorbents at different flow rates were higher before effluent volume reached 40BV, and the adsorbents reached the adsorption equilibrium at 70BV. In the dynamic desorption process, the concentration of Li+ in the desorption solution increased first and then decreased, and 3~4BV desorption solution could be collected as a qualified solution for subsequent concentration production.