Содержание журнала №4 за 2014 год
Информация о статье:
| Раздел/Section | Экология | Environmental problems |
| Страницы/Pages | 44-48 | |
| Заглавие/Title | Электрофлотационное извлечение ионов церия (III), (IV) из водных растворов | Recovery of Cerium (III) and (IV) from Aqueous Solutions by Electroplotation |
| Авторы/Authors | Гайдукова А.М., Бродский В.А., Колесников В.А. | Gaidukova A.M., Brodskiy V.A., Kolesnikov V.A. |
| Ключевые слова Keywords | электрофлотация; редкоземельные металлы; малорастворимые соединения церия; электрокинетический потенциал; размер частиц; electroflotation; rare-earth metals; hard soluble cerium compounds; electrokinetic potential; size of particles | |
| Аннотация Description | Исследовано электрофлотационное извлечение ионов церия (III), (IV) из водных растворов. Определено, что наиболее эффективно процесс электрофлотационного извлечения малорастворимых соединений Ce (III) протекает при рН 8, соединений Ce (IV) при рН 6,5. В обоих случаях степень извлечения соединений церия (III), (IV) достигает 98% при объёмной плотности тока 0,4 А/л, и продолжительности процесса 10 мин. | Basic parameters of the process for the recovery of Ce(III) and Ce (IV) ions from aqueous solutions (pH, process duration τ, bulk current density), which correspond to maximum efficiency are given. Experiments have shown that at pH≥6,5 Ce(IV) degree of recovery is above 95%, probably due to the insolubility of Ce(IV) compounds, while the lowest solubility of Ce(III) compounds is over the pH range 7 to 9. Dependence of the mean hydrodynamical particles diameter on the pH value was studied (Fig.2). Degree of the recovery and purification efficiency are increasing at greater particles diameter. Maximum diameters were observed: for Ce(III) – at pH 8; for Ce(IV) – at 6,5 to 10,0; degree of recovery approaching 100% (Fig.1). Effect of pH on particles charge for Ce(III) and Ce(IV) was also studied (Fig.3). Process results were show to be determined by the size and the charge of the particles (Fig.3). Maximum efficiency of the process was reached at i=0,4 A/l (Fig.4). Optimum duration of the process was found to be equal to 10 min (Table 1). Maximum efficiency of the recovery was found to be at the concentration up to 300 mg/l for Ce(III) and up to 200 mg/l for Ce(IV) (Table 2). |
| Текст/Text | http://elibrary.ru/item.asp?id=22774349 | |