کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
582109 | 1453165 | 2009 | 5 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Dissolution rate of South African calcium-based materials at constant pH
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
بهداشت و امنیت شیمی
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چکیده انگلیسی
One of the most important steps in the wet limestone-gypsum flue gas desulphurization (WFGD) process is limestone dissolution, which provides the dissolved alkalinity necessary for SO2 absorption. Accurately evaluating the limestone dissolution rate is important in the design and efficient operation of WFGD plants. In the present work, the dissolution of limestone from different sources in South Africa has been studied in a pH-Stat apparatus under conditions similar to those encountered in wet FGD processes. The influence of various parameters such as the reaction temperature (30 â¤Â T â¤Â 70 °C), sorbent particle size (25 â¤Â dp â¤Â 63 μm), solution acidity (4 â¤Â pH â¤Â 6), and chemical composition were studied in order to determine the kinetics of the sorbent dissolution. The results obtained indicate that the dissolution rate increased with a decrease in particle size, decrease in pH and an increase in temperature. Kinetic analysis of the results indicates that the dissolution of limestone is according to the shrinking core model with surface control, i.e. 1â(1â3)1/3 = kt.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Hazardous Materials - Volume 163, Issues 2â3, 30 April 2009, Pages 678-682
Journal: Journal of Hazardous Materials - Volume 163, Issues 2â3, 30 April 2009, Pages 678-682
نویسندگان
Z.O. Siagi, M. Mbarawa,