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锂吸附剂失活机理及再生工艺研究
邢红1, 杨建育1, 张荣子1, 郎万中2
1.青海盐湖蓝科锂业股份有限公司, 青海 格尔木 816000;2.上海师范大学 化学与材料科学学院, 上海 200234
摘要:
对工业装置中的吸附剂中毒机理进行了分析,并对中毒后吸附性能的再生开展了研究。通过X射线能谱(EDS)、X射线衍射(XRD)和扫描电子显微镜(SEM)等表征手段分析了吸附剂中毒机理,发现传质孔道被含镁沉积物堵塞是吸附剂中毒的主要原因,导致传质面积降低,进而影响吸附容量。在此基础上,研究了多种吸附剂的再生工艺,并对铵盐再生工艺进行了优化。结果表明:当铵盐处理液质量浓度为0.6 g·L-1、恢复时间为97.6 h时,能满足工业生产的处理要求。
关键词:  吸附  工业提锂  盐湖卤水  吸附剂  再生工艺
DOI:10.3969/J.ISSN.1000-5137.2020.05.006
分类号:TQ131.1
基金项目:上海绿色能源化工工程技术研究中心项目(18DZ2254200)
Study on deactivation mechanism and regeneration process of lithium-adsorbent
XING Hong1, YANG Jianyu1, ZHANG Rongzi1, LANG Wanzhong2
1.Qinghai Salt Lake Lanke Lithium Industry Co., Ltd., Geermu 816000, Qinghai, China;2.College of Chemistry and Materials Science, Shanghai Normal University, Shanghai 200234, China
Abstract:
In this paper, the mechanism of adsorbent poisoning in industrial installations was analyzed and the regeneration of adsorption performance after poisoning was studied. The mechanism of adsorbent poisoning was analyzed by energy-dispersive spectrometry(EDS), X-ray diffraction(XRD), and scanning electron microscopy(SEM).The main reason for adsorbent poisoning was that the mass transfer channel was blocked by magnesium compound sediments, which led to the reduction of the mass transfer area and affected the adsorption capacity.On this basis, a variety of adsorbent regeneration processes were developed, and the adsorbent regeneration process with ammonium salt was optimized.The results showed that the treatment liquid concentration of 0.6 g·L-1 and recovery time of 97.6 h could meet the treatment requirements of industrial production.
Key words:  adsorption  industrial extraction of lithium  saline lake brine  adsorbent  regeneration process