Precipitation of Aluminium Hydroxide by Hydrogen Peroxide from Natrium Aluminate Solutions
G. I. ALYSHANLY
Nagiev Institute of Catalysis and Inorganic Chemistry, National Academy of Sciences of Azerbaijan, Baku, Azerbaijan
alishanova91@mail.ru
Ключевые слова: aluminium hydroxide, alkali, caustic modulus, hydrogen peroxide, green reagent
Страницы: 333-340
Аннотация
In this study, the conditions for the precipitation of aluminium hydroxide from sodium aluminate solutions obtained from the alkaline solution of raw alunite ore by hydrogen peroxide, an eco-friendly reagent, are studied. Factors influencing the precipitation by H2O2 and aluminium hydroxide from diluted aluminate solutions (concentrations of hydrogen peroxide and alkali, volume ratios of hydrogen peroxide and aluminate solution, temperature, time, caustic modulus) are investigated and found under optimal conditions (initial concentration of hydrogen peroxide >15 %; temperature 20-40 °C, VH2O2/Vsol = (5-20) : 20 mL, alkali concentration 42.33 g/L (according to Na2O)) precipitation of ~95 % of aluminium in aluminate solution is achieved. The recovery of alkali (sodium hydroxide) after the precipitation of aluminium hydroxide by H2O2, its return to the leaching of alunite has been studied, and several difficulties have been eliminated in the precipitation of aluminium hydroxide by other methods. The characteristics of the obtained samples are confirmed by means of XRD, SEM/EDS analysis.
DOI: 10.15372/KhUR2022388 |
