(中南大學 冶金與環(huán)境學院，長沙 410083)
摘 要: 通過對比固定床吸附過程與串級萃取過程，發(fā)現(xiàn)固定床上的吸附過程相當于無窮多級溶劑萃取過程的串聯(lián)。基于串級萃取的模型結構與樹脂的等溫吸附方程，得到不同吸附類型下穿透曲線的描述公式。以D850樹脂吸附Cu(Ⅱ)離子的過程為例，對建立的模型進行驗證，并且分析了各種初始參數(shù)的變化對模型精確度的影響。結果表明：該模型可以很好地描述固定床吸附過程，在不同流量與不同初始濃度條件下預測方程與穿透曲線之間的相關系數(shù)均可達到0.99以上。
關鍵字: 串級萃取；穿透曲線；固定床吸附； Cu(Ⅱ)離子；樹脂
（School of Metallurgy and Environment, Central South University, Changsha 410083, China）
Abstract:By comparing the fixed-bed adsorption process and countercurrent extraction process, it is found that the adsorption process on a fixed-bed is equivalent to an infinite series of solvent extraction processes in series. Based on the model structure of the countercurrent extraction and the isothermal adsorption equation of the resin, the description formula of the penetration curve under different adsorption types was obtained. Taking the adsorption of Cu (Ⅱ) ion on D850 resin as an example, the established model was validated and the influence of various initial parameters on the accuracy of the model is analyzed. The results show that the correlation coefficient can reach more than 0.99 under different flow rates and different initial concentrations, and the correlation coefficient can reach 0.99 when the height-diameter ratio is greater than 1.59.
Key words: countercurrent extraction; breakthrough curve; fixed-bed; Cu(Ⅱ)ion; resin
