کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
214114 1425817 2012 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Geopolymerization behavior of Cu–Ni slag mechanically activated in air and in CO2 atmosphere
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی مهندسی شیمی (عمومی)
پیش نمایش صفحه اول مقاله
Geopolymerization behavior of Cu–Ni slag mechanically activated in air and in CO2 atmosphere
چکیده انگلیسی

Geopolymerization of granulated Cu–Ni slag, mechanically activated in air and in CO2 atmosphere (P = 105 Pa) was studied by XRD, SEM-EDXA, FTIR, TEM, and isothermal conduction calorimetry. Mechanical activation of the slag was carried out in a centrifugal-planetary ball mill for 10 min. Geopolymer samples were prepared by mixing of the mechanically activated slag with sodium silicate solution (with molar ratio SiO2/Na2O = 1.5) and curing at 20 ± 2 °C under relative humidity of 95 ± 5% for up to 360 days. Mechanical activation of the slag in CO2 resulted in higher compressive strength of the geopolymer samples in comparison to mechanical activation in air. Compressive strength for the geopolymer samples prepared using slag mechanically activated in air was 50.5, 74.6, 81.1, 82.8, and 89.5 MPa, after curing for 1, 7, 28, 150, and 360 days, respectively. The same values for the geopolymer samples prepared using slag mechanically activated in CO2 were 53.8, 77.4, 94.4, 106.0, and 119.0 MPa, respectively. Higher compressive strength of the geopolymer samples prepared using slag mechanically activated in CO2 was attributed to higher reactivity of the slag particles during geopolymerization induced by chemisorption of carbon dioxide molecules in the form of distorted carbonate ions in the course of mechanical activation.


► We have studied geopolymerization of Cu–Ni slag.
► Preliminary mechanical activation of the slag in air and in CO2 was carried out.
► Mechanical activation in CO2 leads to higher compressive strength of geopolymer.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Journal of Mineral Processing - Volumes 112–113, 10 September 2012, Pages 101–106
نویسندگان
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