Abstract:

China has rich lithium resources,but most of them exist in brine,so it is difficult to extract and utilize.In order to improve the efficiency of lithium extraction process in Taihe underground brine,the high performance aluminum-based lithium adsorbent was prepared.The aluminum-based lithium adsorbent was prepared by one step method.The crystal structure was characterized by X-ray powder diffraction.The influence of the feeding mode,the ratio of the aluminum lithium substantial amount,the pH at the end of the reaction,the reaction temperature,the rate of feeding and the stirring speed on the adsorption capacity of the adsorbent were studied.The optimum preparation conditions of the sorbent were determined：the ratio of the content to the aluminum lithium substance was 1.25∶1,the pH of the reaction terminal point was 6~7,the reaction tempera-ture was 75 ℃,the acceleration rate of the sodium hydroxide solution was 3 mL/min,and the stirring speed was 100 r/min. The results showed that the average adsorption capacity of the adsorbent was 15.06 mg/g,the average desorption capacity was 14.11 mg/g and the desorption efficiency was 93.69%.

Key words: lithium resources, adsorption, aluminum-based lithium adsorbent, coprecipitation