کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
213065 462079 2009 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Dissolution kinetics of spent petroleum catalyst using two different acidophiles
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی مهندسی شیمی (عمومی)
پیش نمایش صفحه اول مقاله
Dissolution kinetics of spent petroleum catalyst using two different acidophiles
چکیده انگلیسی

Leaching studies using spent petroleum catalyst containing Ni, V and Mo were carried out using two different acidophiles, iron oxidizing (IOB) and sulfur oxidizing (SOB) bacteria. XRD analysis proved the existence of V in oxide form, Ni in sulfide form, Mo both in oxide and sulfide forms, and sulfur in elemental state. Both bacteria showed similar leaching kinetics at the same leaching parameters, such as pH, nutrient concentration, pulp density, particle size and temperature. The dissolution kinetics for Ni and V was much higher than Mo. Bioleaching kinetics was observed to follow dual rates, initially faster followed by a slower rate. So, dissolution mechanism was based on surface- and pore-diffusion rate. The dissolution process was found to follow 1st order kinetics. Unified dissolution rate kinetics equations were developed using 1st order rate kinetics. Various thermodynamic parameters were also calculated. Rate determining step for both the bacteria were evaluated and the average D1 (surface) and D2 (pore) values were found to be around 7 × 10− 9 and 1 × 10− 10 cm2 respectively. The lower value of D2 suggested that the pore diffusion is the rate determining step during bioleaching process.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Hydrometallurgy - Volume 99, Issues 3–4, November 2009, Pages 157–162
نویسندگان
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