مطالعه تجربی جذب اورانیوم از پسماند جامد راکتور مونل با استفاده از رزین آمبرلایتIRA-910 در فرآیند تبادل یون

نوع مقاله : مقاله پژوهشی

نویسندگان

1 کارشناسی ارشد، پژوهشگاه علوم و فنون هسته‌ای، تهران، ایران.

2 دانشیار، دانشکده مهندسی شیمی، دانشگاه علم و صنعت ایران، تهران، ایران.

3 استادیار، دانشکده مهندسی شیمی، دانشگاه علم و صنعت ایران، تهران، ایران.

چکیده

هدف از این تحقیق مطالعه و بررسی استخراج اورانیوم از یک پسماند جامد با استفاده از فرآیند تبادل یون توسط رزین می‌باشد. بدین منظور پسماند جامد راکتور فلوریناسیون انتخاب گردید. جهت بازیابی اورانیوم از پسماند جامد از اسیدسولفوریک به‌عنوان حلال و سپس رزین آمبرلایت IRA-910 جهت جذب نهایی در فرآیند تبادل یون استفاده گردید. نتایج نشان داد که اورانیوم با بازدهی 80 تا 90 درصد توسط این رزین جذب گردید. جرم بهینه رزین برای جذب از محیط اسیدسولفوریک با غلظت‌های اولیه اورانیوم 180، 270 و 450 میلی‌گرم بر لیتر، به ترتیب 15/0، 3/0 و 5/0 گرم به‌دست آمد. اثر غلظت اولیه اورانیوم، زمان تماس و دما بر جذب مورد بررسی قرار گرفت. زمان تماس بهینه 2 ساعت به‌دست آمد. پارامترهای ترمودینامیکی تغییر آنتالپی، انتروپی و تغییر انرژی گیبس، برای غلظت اولیه اورانیوم 370 میلی‌گرم بر لیتر محاسبه گردید. داده‌های تجربی برای غلظت اولیه اورانیوم 185 میلی‌گرم بر لیتر و غلظت اسیدسولفوریک 09/0 و 02/0 مولار تطابق بسیار خوبی با ایزوترم جذب فروندلیچ دارند. پارامترهای سینتیکی جذب اورانیوم از محلول پسماند لیچ شده بر روی رزین IRA-910 برای سینتیک جذب لاگرانژ و نیز سینتیک شبه درجه دو محاسبه گردید.

کلیدواژه‌ها


عنوان مقاله [English]

Experimental study of uranium adsorption from solid waste solution of the Monel reactor using the Amberlite IRA- 910 resin in the ion exchange process

نویسندگان [English]

  • Akram Rahmati 1
  • Ahad Ghaemi 2
  • alireza Hemmati 3
1 M.Sc., Nuclear Science and Technology Research Institute (NSTRI), Tehran, Iran.
2 Associate Professor, School of Chemical Engineering, Iran University of Science and Technology, Tehran, Iran.
3 Assistant Professor, School of Chemical Engineering, Iran University of Science and Technology, Tehran, Iran.
چکیده [English]

The extraction of uranium from a solid waste by using the resin ion exchange process is the subject of this study. For this purpose, the solid waste of the fluorination reactor was selected. In order to uranium recovery from this solid waste, sulfuric acid was used as a solvent and IRA-910 amberite resin was used for adsorption by ion exchange process. The results showed that uranium was adsorbed by this resin with 80-90 % efficiency. The optimum mass of resin for adsorption from sulfuric acid medium with initial concentrations of 180, 270 and 450 mg / l uranium were 0.15, 0.3 and 0.5 g, respectively. The effect of uranium initial concentration, contact time and temperature on adsorption was investigated. The optimum contact time was 2 hours. The thermodynamic parameters of enthalpy change, entropy, and Gibbs energy change for the initial uranium concentration of 370 mg / l were calculated and it was determined that this process is endothermic. Experimental data for the initial uranium concentration of 185 mg / l and the sulfuric acid concentration of 0.09 and 0.02 M are in excellent agreement with the Freundlich isotherm absorption. The kinetic parameters of uranium uptake on IRA-910 for Lagergren and pseudo second order adsorption kinetics were calculated.

کلیدواژه‌ها [English]

  • Uranium
  • Waste
  • Resin
  • Adsorption
  • Amberlite IRA- 910
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