کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
233333 465334 2014 10 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Carbonation of stainless steel slag in the context of in situ Brownfield remediation
ترجمه فارسی عنوان
کربنات سرباره فولاد ضدزنگ در زمینه پاکسازی میدان مغناطیسی
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی مهندسی شیمی (عمومی)
چکیده انگلیسی


• Lab scale column carbonation tests were performed on stainless steel slag.
• The effects of carbonation on CO2 uptake, mineralogy and leaching were analyzed.
• Even at mild operating conditions, a significant extent of carbonation occurred.
• Leaching and mineralogy of the slag were significantly affected by carbonation.

The main aim of this work was to assess the potential of in situ carbonation as a treatment to modify the properties of alkaline materials such as industrial soil in terms of leaching behaviour and mineralogy and to store the CO2 generated by specific treatments applied in the context of Brownfield regeneration. The process was investigated through lab-scale column carbonation experiments, in which 100% CO2 was fed through humidified stainless steel slag under ambient temperature and pressure for set reaction times. The reaction kinetics and the maximum CO2 uptake attained (5.5%), corresponding to a Ca conversion yield of 15.6%, after 4 h treatment proved slightly lower than those resulting from batch tests carried out on the same particle size fraction at enhanced operating conditions. The mineralogy of the material showed to be affected by column carbonation, exhibiting a higher calcite content and the decrease of Ca hydroxide and silicate phases. As a result of carbonation, the material showed a decrease in pH and Ca release as well as an increase in Si mobility. Furthermore, a reduction of Cr and Ba leaching, up to 63% and 96% respectively, was achieved after 2 h of reaction. However, carbonation was observed to lead to an increased leaching of V and Mo. The effects of carbonation on the leaching behaviour of the material were also investigated performing pH-dependence leaching tests and the results indicated that in situ carbonation appears to be a promising treatment to improve the properties of alkaline materials in view of their reuse on-site.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Minerals Engineering - Volume 59, May 2014, Pages 91–100
نویسندگان
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