Study of sorption purification of lithium hydroxide solutions from aluminum by resin ANB-11g

The results of studying the main regularities of the sorption of aluminum on complexing resin ANB-11g from lithium hydroxide solutions are given. The sorbent contains functional groups of methylglucosylamine (N-methylglucamine) and is produced by amination of chloromethylated copolymer of styrene and divinylbenzene by methylglucosylamine. Tests of its chemical and thermal stability in solutions containing 48 g/dm³ LiOH showed that ANB-11g retains sorption properties after 30 days contact with it. Heating of the studied sorbent in this solution to 373 K doesn’t lead to a change in IR spectra-they are identical to the original. It was established on constructing the sorption isotherms of aluminum from solutions with 12–96 g/dm³ LiOH that an increase of the resin’s capacity for aluminum is observed with increasing content of the alkali in the original solution. The sorbent is regenerated by a diluted solution of the alkali with heating of the eluent to T = 323–363 K. As a result of pilot industrial testing of sorption purification of lithium hydroxide solutions to remove aluminum, the content of metal in them decreased by 1–2 orders of magnitude in them depending on the volume of solutions that passed through the resin. The degree of aluminum desorption was 99.5%.