针对传统锂吸附剂为粉末材料时机械强度和渗透性差等问题，采用乙烯-乙酸乙烯共聚物（EVA）作为黏合剂制备一种新型EVA/HMO复合吸附剂。在EVA质量分数为18%、致孔剂质量分数为5.0%、热熔温度为121℉的条件下制备的粒状吸附剂形态最佳、磨损量低，其吸附容量为26.35 mg/g。对该粒状吸附剂动态吸附过程进行研究，确定卤水用量为250 mL，此时吸附率为85.4%；解洗液用量为90 mL，解吸率为99.1%。此外对粒状吸附剂的循环性能进行研究，经过20次连续实验，锂吸附率在85%左右，解吸率在100%左右，吸附剂的溶损率约1×10^-3%，表明该粒状吸附剂提锂效果良好、锰溶损率极低。

Aiming at the problems of traditional lithium adsorbents as powder materials,such as poor mechanical strength and permeability,ethylene-vinyl acetate copolymer (EVA) is used as a binder to prepare a new type of EVA/HMO composite adsorbent.The prepared granular adsorbent has the best morphology,low abrasion,and an adsorption capacity of 26.35 mg·g^-1 when the mass fractions of EVA and pore-forming agent is 18wt% and 5.0 wt%,respectively,and hot melt temperature maintains at 121℉.Dynamic adsorption process of the granular adsorbent is studied,and it is determined that the adsorption rate reaches 85.4% when the amount of brine is 250 mL;the desorption rate can reach 99.1% when the usage amount of dewashing liquid is 90 mL.In addition,cycle performance of the granular adsorbent is studied.After 20 times of consecutive experiments,lithium adsorption rate is around 85%,desorption rate approaches 100%,and the dissolution loss rate of the adsorbent is only 1×10^-3 percent,indicating that the granular adsorbent can contribute to a good effect in extracting lithium,and the dissolution rate of manganese is extremely low.

陈周秦(1996-),女,硕士研究生,主要从事盐湖提锂与锂吸附剂成型研究,chen1852208@163.com