铝基锂吸附剂制备及其在泰和地下卤水提锂中的应用

中国锂资源丰富,但是大部分存在于卤水中,提取利用困难。为提高泰和地下卤水提锂过程的效率,制备了高性能的铝基锂吸附剂。采用一步法制备了铝基锂吸附剂。通过X射线粉末衍射仪表征了铝基锂吸附剂的晶型结构。研究了加料方式、铝锂物质的量比、反应终点pH、反应温度、加料速率、搅拌转速等因素对铝基锂吸附剂吸附容量的影响。确定了铝基锂吸附剂的最佳制备条件：将氢氧化钠溶液滴加到氯化铝和氯化锂的混合液中,铝锂物质的量比为1.25∶1,反应终点pH为6~7,反应温度为75 ℃,氢氧化钠溶液滴加速率为3 mL/min,搅拌转速为100 r/min。将制备的铝基锂吸附剂应用于泰和地下卤水的提锂过程,结果显示铝基锂吸附剂的平均吸附容量高达15.06 mg/g、平均脱附容量为14.11 mg/g、脱附效率为93.69%。

Preparation of aluminum-based lithium adsorbent and its application in extracting lithium from Taihe underground brine

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%.