نوع مقاله: مقاله فنی

نویسندگان

1 دانشکده مهندسی انرژی و فیزیک، دانشگاه صنعتی امیرکبیر، صندق پستی: 4413-15875، تهران - ایران

2 پژوهشکده چرخه سوخت هسته‌ای، پژوهشگاه علوم و فنون هسته‌ای، سازمان انرژی اتمی ایران، صندوق پستی: 8486-11365، تهران ـ ایران

چکیده

در این پژوهش استخراج اورانیم از محلول فروشویی سنگ معدن اورانیم با استفاده از روش استخراج حلالی برای اولین بار در یک ستون استخراج ضربه‌ای افقی از نوع سینی‌دار مورد بررسی قرار گرفت. استخراج اورانیم از محیط سولفاته با غلظت 1-mol.L 25/0، توسط حلال تری اکتیل آمین با غلظت 5 درصد حجمی، در رقیق‌­کننده‌ی کروزن با 90 درصد حجمی و اصلاح­‌کننده‌ی فازی دکانول با غلظت 5 درصد حجمی انجام گرفت. تأثیر پارامترهای عملیاتی شامل شدت ضربه، نرخ جریان فاز پراکنده و نرخ جریان فاز پیوسته بر روی موجودی فاز پراکنده، قطر میانگین ساتر قطرات و توزیع آن­‌ها و هم‌­چنین درصد استخراج به دست آمد. افزایش شدت ضربه و افزایش نرخ جریان فاز پراکنده و هم‌­چنین کاهش نرخ جریان فاز پیوسته باعث افزایش درصد استخراج گردید. نتایج نشان می‌دهد که ستون استخراج ضربه‌ای افقی از نوع سینی‌دار دارای بازدهی بالا برای استخراج اورانیم از محلول فروشویی و از نظر بازدهی استخراج قابل رقابت با ستون­‌های ضربه‌ای سینی‌دار از نوع عمودی می‌باشد. با مقایسه روابط متعدد ارایه شده برای موجودی فاز پراکنده و اندازه قطره با نتایج تجربی به دست آمده در این پژوهش، رابطه‌ی جدیدی برای پیش‌­بینی قطر میانگین قطرات و هم­‌چنین موجودی فاز پراکنده در یک ستون استخراج ضربه‌ای برای استخراج اورانیم ارایه گردید. در مدل ارایه شده، مقدار متوسط خطای مطلق برای اندازه قطره 7/7% و برای موجودی فاز پراکنده 2/8% به دست آمد.

کلیدواژه‌ها

عنوان مقاله [English]

Investigation of hydrodynamic parameters and separation efficiency of uranium by Tri-n octylamine in a horizontal pulse sieve plate column

نویسندگان [English]

  • H. Badakhshan 1
  • A. Gharib 1
  • F. Panahinia 2
  • M. Ghannadi-Maragheh 2
  • J. Safdari 2
  • M.H. Mallah 1

1 Energy Engineering and Physics Department, Amirkabir University of Technology, P.O. Box: 15875-4413, Tehran - Iran

2 Nuclear Fuel Cycle Research School, Nuclear Science and Technology Research Institute, AEOI, P.O.Box: 11365-8486, Tehran – Iran

چکیده [English]

In this study, recovery of uranium from leach liquor using solvent extraction technique in a horizontal pulsed sieve plate column was experimentally investigated. Extraction of uranium from an aqueous sulfate solution with 0.25M concentration acid, by using TOA solvent, diluted in kerosene and n-decanol modifier of 5%, 90% and 5% v/v respectively was studied and the influences of operation parameters including the phase flow rates along with pulsation intensity on the dispersed phase holdup, drop size and drop size distribution, as well as extraction efficiency, were evaluated. Increasing pulsation intensity along with the dispersed phase flow rate and decreasing the continuous phase flow rate caused to increase the extraction efficiency. Results showed that the horizontal pulsed sieve plate column has high efficiency for extraction of the uranium from leach liquor. Moreover, a comparative evaluation of available correlations proposed for the prediction of mean drop size and hold up in such columns have been conducted. New correlations for estimating mean drop size and hold up in a horizontal pulsed sieve-plate column were presented, which provided AARE of 7.7% and 8.2%, respectively.

کلیدواژه‌ها [English]

  • Uranium extraction
  • Dispersed phase holdup
  • Sauter mean drop diameter
  • Horizontal pulsed sieve-plate column

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