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Metals 2016, 6(5), 117;

Roles of Mineralogical Phases in Aqueous Carbonation of Steelmaking Slag

School of Metallurgy and Chemical Engineering, Jiangxi University of Science and Technology, Ganzhou 341000, China
State Key Laboratory of Hybrid ProcessIndustry Automation System and Equipment Technology, Automation Research and Design Institute of Metallurgical Industry, China Iron and Steel Research Institute Group, Beijing 100071, China
Author to whom correspondence should be addressed.
Academic Editor: Corby G. Anderson
Received: 29 March 2016 / Revised: 2 May 2016 / Accepted: 5 May 2016 / Published: 18 May 2016
(This article belongs to the Special Issue Recycling of Metals)
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Mineralogical phases of steelmaking slags have significant influences on the carbonation of the slags. In this paper, the effects of temperature and reaction time on the conversion of calcium-related phases and the carbonation degree of a slag sample were studied. The experimental conditions were a liquid-to-solid ratio of 20 mL/g, a carbon dioxide flow rate of 1 L/min and a slag particle size of 38–75 μm. The results show that the optimum carbonation temperature and reaction time are 60 °C and 90 min, respectively, and calcite phase content is about 26.78% while the conversion rates of Ca3Al2O6, CaSiO3, Ca2SiO4 and free CaO are about 40%, 42.46%, 51% and 100%, respectively, and the carbon dioxide sequestration efficiency is about 170 g/kg slag. View Full-Text
Keywords: steelmaking slag; mineralogical phase content; carbonation degree; conversion rate steelmaking slag; mineralogical phase content; carbonation degree; conversion rate

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Zhang, H.; Lu, Y.; Dong, J.; Gan, L.; Tong, Z. Roles of Mineralogical Phases in Aqueous Carbonation of Steelmaking Slag. Metals 2016, 6, 117.

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