کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5783274 | 1637948 | 2017 | 39 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Illite dissolution kinetics from 100 to 280 °C and pH 3 to 9
دانلود مقاله + سفارش ترجمه
دانلود مقاله ISI انگلیسی
رایگان برای ایرانیان
کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
علوم زمین و سیارات
ژئوشیمی و پترولوژی
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
Some geothermal reservoirs may require permeability enhancements (either by reactivating existing fracture networks or creating new ones) to allow sufficient fluid and heat transfer throughout the system. In these engineered geothermal systems (EGS), fluid/mineral reactivity is of interest because mineral reaction can affect fracture apertures, wall rock stability, and potential downstream precipitation. In this study we focus on the reactivity and dissolution of illite, an aluminosilicate sheet mineral common in geothermal systems, measured in flow-through experiments carried out at temperatures of 100-280 °C and pH 2.7-9.7. Under these conditions, illite dissolves readily according to:Rillite=1Ã10-2·e-58/RT·aH+0.55+2Ã10-5·e-54/RT+1.5·e77/RT·aOH-0.35·f(ÎGr),where Rillite represents the surface area-normalized dissolution rate. Illite dissolves congruently under alkaline pH conditions at temperatures of 100 °C and above, but as pH decreases below 5 illite dissolution is accompanied by precipitation of an aluminum oxy(hydroxide) phase identified as boehmite by X-ray diffraction of bulk samples. Precipitation of AlO(OH)(s) appears to proceed rapidly and is limited by the rate of illite dissolution in our experiments.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Geochimica et Cosmochimica Acta - Volume 209, 15 July 2017, Pages 9-23
Journal: Geochimica et Cosmochimica Acta - Volume 209, 15 July 2017, Pages 9-23
نویسندگان
Megan M. Smith, Zurong Dai, Susan A. Carroll,