摘要
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 m L,此时吸附率为85.4%;解洗液用量为90 m L,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 18 wt% 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 m L;the desorption rate can reach99. 1% when the usage amount of dewashing liquid is 90 m L.In addition,cycle performance of the granular adsorbent is studied.After 20 times of consecutive experiments,lithium adsorption rate is around 85%,desorption rate approaches100%,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.
作者
陈周秦
赖先熔
彭嘉惠
钟辉
CHEN Zhou-qin;LAI Xian-rong;PENG Jia-hui;ZHONG Hui(College of Materials and Chemistry&Chemical Engineering,Chengdu University of Technology,Chengdu 610059,China)
出处
《现代化工》
CAS
CSCD
北大核心
2021年第6期150-154,共5页
Modern Chemical Industry
基金
西藏重点研发计划项目(XZ202001ZY0010G)。
关键词
锰氧化物
锂回收
造粒
卤水
乙烯-乙酸乙烯共聚物
manganese oxides
lithium recovery
granulation
brine
ethylene-vinyl acetate copolymer
