锂吸附剂失活机理及再生工艺研究

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。

Study on deactivation mechanism and regeneration process of lithium-adsorbent

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.