A integrated route for CO2 capture in the steel industry and its conversion into CaCO3 using fundamentals of Solvay process

Content Provider	Semantic Scholar
Author	Pinto, P. C. Carvalho Silva, T. R. Da Linhares, Fabiano Maia Andrade, Fabrício Vieira De Carvalho, M. M. Oliveira Lima, Geraldo M. De
Copyright Year	2016
Abstract	In this work we propose the transformation of CO2 into calcium carbonate utilizing steel slag and the waste heat generated in the steel industry. The necessary chemicals, aqueous NH4Cl and solid NaHCO3, were obtained as products of a bench scale Solvay process. Our approach is divided into four steps: (i) CO2 capture using ammoniated brine, (ii) Ca2+ lixiviation from steel slag, through the reaction with NH4Cl(aq), (iii) CaCO3 precipitation by reacting the leachate with NaHCO3, and (iv) NaCl and NH3 reclamation. Steel slag is utilized as the source of calcium. A small amount of heat is required by the overall process, which could be also provided by waste heat from the steel industry. Laboratory scale experiments showed that nearly 95 wt% of NaCl and NH3 necessary for the mineral carbonation can be regenerated, therefore minimizing costs. At the end of this process, 98 wt% pure CaCO3 is obtained, and up to 94 wt% of the extracted Ca2+ was precipitated with no need for pH adjustments. Finally, we observed that, depending on the source of the steel slag, 86 kg of high purity CaCO3 could be obtained from 38 kg of CO2 and 1000 kg of steel slag.Graphical Abstract
Starting Page	1123
Ending Page	1139
Page Count	17
File Format	PDF HTM / HTML
DOI	10.1007/s10098-016-1105-3
Alternate Webpage(s)	http://www.sbq.org.br/39ra/cdrom/resumos/T0990-1.pdf
Alternate Webpage(s)	https://doi.org/10.1007/s10098-016-1105-3
Volume Number	18
Journal	Clean Technologies and Environmental Policy
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article