Utilization of Malaysia EAF slags for effective application in direct aqueous sequestration of carbon dioxide under ambient temperature

Sunday O Omale,Thomas S.Y Choong,Luqman C Abdullah,Shamsul I Siajam,Mun W Yip

doi:10.1016/j.heliyon.2019.e02602

Abstract

Iron and steel industries are among the contributors of CO2 emission in large volume into the atmosphere, causing detrimental effects to the environment and the ecosystem at large scale. These industries also generate solid wastes in the form of electric arc furnace (EAF) slag during operations which result in about 10–15% slag wastes per ton of steel produced. In this study, the EAF slags from an iron and steel-making factory in Klang, Malaysia was utilized for CO2 sequestration through direct aqueous mineral carbonation. According to the surface area analysis, the fresh EAF slag has a mesoporous structure, its elemental composition shows the presence of 20.91 wt.% of CaO that was used for the sequestration of CO2 through carbonation. The sequestration capacity was found to be 58.36 g CO2/kg of slag at ambient temperature in 3 h, with the liquid/solid (L/S) ratio of 5:1 and using <63μm particle size. Moreover, the shrinking core model (SCM) was used to analyze the solid-fluid reaction in a heterogeneous phase and the CO2 sequestration shows to be controlled by the product layer phase. The EAF slag is demonstrated to have the potential of CO2 sequestration at ambient temperature.

Highlights

Iron and Steel industries are among the major contributors of gaseous carbon dioxide (CO2) emission in large volume into the atmosphere, thereby causing serious environmental challenges (Tian et al, 2018)
This study shows that the electric arc furnace (EAF) slag from iron and steel industry at
Malaysia with 20.91weight % of calcium oxide (CaO) in the fresh slag composition was used for CO2 sequestration

Summary

Introduction

Iron and Steel industries are among the major contributors of gaseous carbon dioxide (CO2) emission in large volume into the atmosphere, thereby causing serious environmental challenges (Tian et al, 2018). With the advent and challenges that come along with modern civilization, the emitted CO2 had an unprecedented increase from pre-industrial period of 277 ppm to more than 400 ppm presently (Ukwattage et al, 2017) This make the natural sequestration (weathering) unable to cope, causing a dreadful damage to the environment. Li et al (2012) had a sequestration report of 77 g CO2/kg of steel slag under ambient temperature in 2 h, with a gas pressure of 15 bar and liquid-solid ratio of 50 L/kg having a CaO in fresh slag of 43.34 wt%. Huijgen et al (2005) was able to sequestrate 185 g CO2/kg of slag after 30 min at a pressure of 19 bar, 100 C with particle sizes of

Methods

Results

Conclusion