استخراج گزینشی و جداسازی مقادیر جزئی کبالت-57 از نیکل

نوع مقاله: مقاله پژوهشی

نویسندگان

پژوهشکده تحقیقات کشاورزی، پزشکی و صنعتی، پژوهشگاه علوم و فنون هسته‌ای، سازمان انرژی اتمی ایران، صندوق پستی: 498-31485، کرج - ایران

چکیده

مقادیر جزئی کبالت-57  به روش استخراج با حلال در حضور عامل کمپلکس‌ساز تیوسیانات، از فاز آبی به فاز آلی ایزوفرون استخراج و از نیکل جدا شد. تأثیر غلظت عامل کمپلکس‌ساز، نسبت حجم فازها و اسیدیته فاز آبی بر بهره جداسازی بررسی گردید. کبالت-57 استخراج شده، در حضور اسید کلریدریک غلیظ طی استخراج برگشتی به فاز آبی برگردانده شد و تأثیر غلظت و حجم اسید بر بهره استخراج برگشتی بررسی گردید. نتایج حاصل نشان داد که محلول تیوسیانات آمونیوم با غلظت 4% وزنی- حجمی، اسیدیته pH=1.5-2  و نسبتهای کوچکتر حجم فاز آلی به حجم فاز آبی بالاترین بهره جداسازی را دارد. بهره استخراج برگشتی کبالت-57 در 5 مرحله شستشو با اسید کلریدریک 5 نرمال، 99.57%  بدست آمد.

کلیدواژه‌ها


عنوان مقاله [English]

Selective Extraction and Separation of Trace Amounts of Cobalt-57 from Nickel

نویسندگان [English]

  • M Akhlaghi
  • P Rowshan Farzad
چکیده [English]

Trace amounts of cobalt-57 were separated from nickel and extracted into isopherone in the presence of thiocyanate as a complexing agent. The effect of various parameters on the separation yield was investigated. These include: concentration of the complexing agent, aqua and organic phases volume ratio and acidity of aqua phase. The extracted cobalt-57 was backextracted into concentrated hydrochloric acid and the effects of hydrochloric acid concentration and volume on backextraction yield were investigated. 4% (W/V) ammonium thiocyanate solution, pH=1.5-2 and lower organic to aqua volume ratio gives the highest separation yield. 99.57% backextraction yield was achieved for cobalt-57 through 5 steps of washing with 5 N HCl.

کلیدواژه‌ها [English]

  • Solvent extraction
  • Separation
  • Traces Amounts
  • Cobalt-57
  • Nickel
  • Isopherone
  • Ammonium Thiocyanate

 

 

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