基于氟铝配位的鳌合树脂吸附氟的可行性分析

Feasibility Analysis for Adsorption of Fluorine by Chelating Resin Based on Aluminum-fluoride Coordination

针对传统树脂吸附除氟选择性不强的问题,提出了一种先向废水中投加铝离子进行氟铝配位,再利用螯合树脂吸附氟铝配合物的新方法。为了考察水溶液中的氟离子转型为氟铝配合物的可行性,对H^+-F^--Al^3+-H2 O体系中F/Al摩尔比和平衡pH的影响进行了热力学分析。结果表明:F/Al摩尔比=1、平衡pH=1~8时,水中游离氟离子全部转型为氟铝配合物,有助于螯合树脂对氟的选择性吸附。

A novel method for removal of fluoride was proposed in view of the poor adsorption selectivity of traditional resin.Aluminum salts were first accurately added into the wastewater for coordination of fluoride and aluminum.Then fluoride was removed by selective adsorption of the chelating resin.The influences of the F/Al molar ratio and equilibrium pH on the thermodynamics for H^+-F^--Al^3+-H2O system was studied to determine the feasibility of the transformation of fluoride ion into aluminum fluoride complexes.The results showed that all fluoride ion transformed into aluminum fluoride complexes at F/Al molar ratio of 1 and equilibrium pH of 1-8,which was facor for the selective absorption of fluoride by the chelating resin.