کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
581936 877849 2009 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Simulation of radioelement volatility during the vitrification of radioactive wastes by arc plasma
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی بهداشت و امنیت شیمی
پیش نمایش صفحه اول مقاله
Simulation of radioelement volatility during the vitrification of radioactive wastes by arc plasma
چکیده انگلیسی
A computer model is used to simulate the volatility of some radioelements cesium (137Cs), cobalt (60Co), and ruthenium (106Ru) during the radioactive wastes vitrification by thermal plasma. This model is based on the calculation of system composition using the free enthalpy minimization method, coupled with the equation of mass transfer at the reactional interface. The model enables the determination of the effects of various parameters (e.g., temperature, plasma current, and matrix composition) on the radioelement volatility. The obtained results indicate that any increase in molten bath temperature causes an increase in the cobalt volatility; while ruthenium has a less obvious behavior. It is also found that the oxygen flux in the carrier gas supports the radioelement incorporations in the containment matrix, except in the case of the ruthenium which is more volatile under an oxidizing atmosphere. For electrolyses effects, an increase in the plasma current considerably increases both the vaporization speed and the vaporized quantities of 137Cs and 60Co. The increase of silicon percentage in the containment matrix supports the incorporation of 60Co and 137Cs in the matrix. The simulation results are compared favorably to the experimental measurements obtained by emission spectroscopy.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Hazardous Materials - Volume 163, Issue 1, 15 April 2009, Pages 136-142
نویسندگان
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