Gallium extraction from alkaline solutions by N-(2-hydroxy-5-nonylbenryl)- beta, beta-dihydroxyethylamine

摘要

Extraction of gallium and aluminum from NaOH solution by N-(2.hydroxy-5-nonylbenzyl)-beta, beta-dihydroxyethylamine (NBEA) has been studied. Based on the data on interphase distribution of gallium, IR spectroscopy and calculation of possible structures of extracted complex, the composition and structure of extracted gallium complex (RGa(OH)_2) were determined by the methods of molecular mechanics. An equation of extraction of gallium and aluminum by NBEA from alkaline solutions was proposed. Effectiveness of NBEA was shown for extraction of gallium in a wide range of alkaline concentrations (E_(Ga) approx 94 ÷ 99 percent at C_(NaOH) approx 0,1 ÷ 5,0 mole/I). Extraction of gallium from aluminum-containing solution has been studied. A possibility of making use of NBEA for extraction for extraction of gallium from recycle solutions of alumina production process was shown. For example, gallium can be extracted from model Bayer solutions (C_(Ga) approx 0,3 g/l, C_(Al) approx 30 g/l, C_(NaOH) approx 3 mole/l) to the amount of 20-58 percent with its complete separation from aluminum at the re-extraction stage.