نوع مقاله : مقاله پژوهشی
نویسندگان
پژوهشکده چرخه سوخت هسته‌ای، پژوهشگاه علوم و فنون هسته‌ای، سازمان انرژی اتمی ایران، صندوق پستی: 8486-11365، تهران- ایران
چکیده
با توجه به محدود بودن ذخایر اورانیم، فراوانی توریم نسبت به آن، عدم کاربرد در تکثیر سلاح‌های هسته‌ای و دیگر مزایای سوخت‌های توریمی نسبت به اورانیمی، توسعه چرخه سوخت توریم در کشورهای مختلف از جمله ایران مورد توجه می‌باشد. در این تحقیق فرایند جداسازی و بازیابی توریم از یک محلول فروشویی اسیدی واقعی با غلظت mg/L 500 توریم در مقیاس آزمایشگاهی به منظور تولید رسوب اکسید توریم مورد ارزیابی قرار گرفت. پارامترهای فرایندی مؤثر بر استخراج، تهی‌‌سازی و ترسیب شیمیایی توریم شامل نوع استخراج‌کننده (اسیدی، بازی و خنثی)، غلظت استخراج‌کننده (M 1-05/0)، اسیدیته فاز آبی (92/6-032/0)، زمان تعادل (min 60-5)، نوع و غلظت تهی‌ساز (M 7-1) و عامل رسوب‌دهنده به روش تک متغیره در هر بخش مورد بررسی و مطالعه قرار گرفت. با توجه به نتایج تجربی استخراج‌کننده دی(2-اتیل هگزیل) فسفریک اسید با غلظت M 1، اسیدیته فاز آبی برابر با 1/0، زمان تماس min 60، سولفوریک اسید با غلظت M 5 به عنوان تهی‌ساز و آمونیاک 25% به عنوان عامل رسوب‌دهنده در این تحقیق انتخاب شد. بازیابی توریم از محلول فروشویی اسیدی واقعی در شرایط فرایندی به دست آمده منجر به تولید رسوب اکسید توریم با خلوص 66% گردید.
کلیدواژه‌ها
عنوان مقاله [English]
Separation of thorium from a real acidic leach liquor solution by solvent extraction method with Di(2-ethylhexyl) phosphoric acid as extractant and chemical precipitation with ammonia
نویسندگان [English]
- F. Khanramaki
- A.R. Keshtkar
- H. Sohbatzadeh
- A. Pourmatin
- N. Akbari
Nuclear Fuel Cycle Research School, Nuclear Science and Technology Research Institute, AEOI, P.O.Box: 11365-3486, Tehran - Iran
چکیده [English]
Due to the limited uranium reserves, the abundance of thorium compared to it, not being used in nuclear proliferation, and other advantages of thorium fuels over uranium fuels, the development of the thorium fuel cycle in various countries, including Iran, is considered. In this research, the separation and recovery processes of thorium from a real acidic leach liquor solution with a concentration of 500 mg/L thorium on a laboratory scale to produce thorium oxide precipitate were evaluated. The operating parameters affecting the extraction, stripping, and chemical precipitation processes of thorium include the type of extractant (acidic, basic, and neutral), the concentration of the extractant (0.05-1 M), aqueous phase acidity (0.032-6.92), equilibrium time (5-60 min), type and concentration of stripper (1-7 M) and precipitating agent were studied by the univariate method in each section. According to the experimental results, Di(2-ethylhexyl) phosphoric acid with a concentration of 1 M as extractant, aqueous phase acidity equal to 0.1, equilibrium time 60 min, sulfuric acid with a concentration of 5 M as a stripper, and ammonia as a precipitating agent were selected. Recovery of thorium from a real acidic leach liquor solution under obtained conditions resulted in the production of thorium oxide precipitate with a purity of 66%.
کلیدواژه‌ها [English]
- Real leach liquor solution
- Solvent extraction
- Chemical precipitation
- Thorium recovery
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