کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
213465 462103 2007 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Rate of cadmium ions removal from dilute solutions by cementation on zinc using a rotating fixed bed reactor
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی مهندسی شیمی (عمومی)
پیش نمایش صفحه اول مقاله
Rate of cadmium ions removal from dilute solutions by cementation on zinc using a rotating fixed bed reactor
چکیده انگلیسی

The present study is concerned with the removal of Cd (II) ions from wastewater by cementation on zinc Raschig rings placed in a rotating basket reactor. The influence of several parameters on the rate of cementation such as initial concentration of cadmium ions, temperature, basket rotation speeds and diameter of zinc rashing rings have been investigated. The rate of cementation was found to increase with increasing bed rotational speed and temperature. On the other hand the rate decreases with increasing the initial cadmium ions concentration in solution and the diameter of zinc Raschig rings. The activation energy was found to be 3.99 kCal/mol. The present reactor proved to be an efficient reactor for cementation reactions in view of its high area per unit volume and its high rate of mass transfer. Rates of cementation which can be expressed in terms of the rate mass transfer were correlated to the controlling parameters by the dimensionless equationSh=0.046Re0.45Sc0.33Sh=0.046Re0.45Sc0.33The present mass transfer data was found to agree with the surface renewal theory.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Hydrometallurgy - Volume 89, Issues 3–4, December 2007, Pages 224–232
نویسندگان
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