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随着LCD报废数量的逐年增多,废弃LCD面板所含金属铟的回收再用已成为铟资源回收领域急需解决的问题。为提高废弃LCD面板金属铟的回收效率,研究提出利用超声对其进行协同浸出,以硫酸为浸出液考察超声及不同反应条件对铟浸出效率的影响。研究结果显示,超声协同能有效提高铟的浸出效率,在实验参数范围内铟的浸出率随超声功率、反应温度及酸浓度的增加而增大,随物料粒径增大而减小。在超声功率为800 W、反应温度60~70℃、硫酸浓度0.5mol/L、物料粒径小于0.5 mm条件下,浸出反应5 h铟的浸出率可达74.1%。在此基础上,研究进一步分析了超声对铟浸出反应的协同作用机制,指出热学与机械作用是超声促进废弃LCD面板金属铟浸出反应进行、提高铟浸出效率的主要作用机制。
With the increasing number of discarded LCDs, the recycling of indium metal contained in the abandoned LCD panel has become an urgent problem to be solved in the field of indium resource recycling. In order to improve the recovery efficiency of metal indium from waste LCD panel, the study proposes the synergistic leaching of the indium from the LCD panel. The influence of ultrasound and leaching conditions on the leaching efficiency of indium is investigated. The results show that ultrasonic synergistic can effectively improve the leaching efficiency of indium. In the experimental parameters, the leaching rate of indium increases with the increase of ultrasonic power, reaction temperature and acid concentration, and decreases with the increase of particle size. Under the conditions of 800 W ultrasonic power, 60-70 ℃ reaction temperature, 0.5 mol / L sulfuric acid concentration and particle size less than 0.5 mm, the leaching rate of indium up to 74.1% after 5 h of leaching reaction. On this basis, the synergistic mechanism of ultrasound on the leaching reaction of indium was further analyzed. It is pointed out that the thermal and mechanical actions are the main mechanism of ultrasound to promote the metal indium leaching reaction of waste LCD panel and improve the leaching efficiency of indium.