Steel Converter Slag as a Raw Material for Precipitation of Pure Calcium Carbonate

Abstract

In this work we study the possibility of utilizing steel converter slag, a byproduct of steel manufacturing, for production of pure calcium carbonate. The dissolution of calcium from steel converter slag by using acetic acid as a solvent and the precipitation of pure calcium carbonate from the resulting solution were experimentally investigated. It was found that, while strong solutions of acetic acid dissolve most of the calcium from the slag, weak acetic acid solutions dissolve calcium selectively. Precipitation of any substantial amount of calcium carbonate was found to require the addition of sodium hydroxide. Calcium conversion from the solution into the precipitate was as high as 86%, and the purity of the precipitate was over 99%. The calcium carbonate particles produced at low temperatures were found to have rhombohedral particle shapes, a very high brightness (98.7%), and a small particle size (mean value of 0.6 µm).

CO2 Capture by Accelerated Carbonation of Alkaline Wastes: A Review on Its Principles and Applications

“…One way to avoid some of these drawbacks is to utilize alkaline waste residues. Table 2 summarizes the example of industrial alkaline solid wastes, e.g., coal-and oil shale-fired power plants (Uibu et al, 2009b;Uibu and Kuusik, 2009a;Uibu et al, 2011), steelmaking slag (Huijgen et al, 2005c;Bonenfant et al, 2008; Huijgen et al, 2005c;Bonenfant et al, 2008;Eloneva et al, 2008b;Kodama et al, 2008;Baciocchi et al, 2009b;Doucet, 2010;Chang et al, 2011a, b Air pollution control (APC) residue Khaitan et al, 2009;Yadav et al, 2010 Sludge (incinerator) ash Sewage sludge incinerator ash (SSA) Steel wastewater sludge (SWS) Paper sludge incinerator ash (PSIA) Gunning et al, 2010 Paper pulping and mill waste…”

“…Paper mill waste (calcium mud) Green sludge dreg Lime mud Lime slaker grits Bird and Talberth, 2008;Pérez-López et al, 2008et al, 2008bKodama et al, 2008;Baciocchi et al, 2009b;Doucet, 2010;Chang et al, 2011a, b), municipal solid waste incinerator (MSWI) ashes (Arickx et al, 2006;FernandezBertos et al, 2004b;Costa et al, 2007;Li et al, 2007;, air pollution control (APC) residues (Baciocchi et al, 2009c;Montes-Hernandez et al, 2009;Nyambura et al, 2011), cement kiln dust (Huntzinger et al, 2009a, b), red mud (RM) (Khaitan et al, 2009;Yadav et al, 2010), paper mill waste (Pérez-López et al, 2008) and even concrete (Haselbach, 2009), etc., as CO 2 adsorbents. Fig.…”

“…The potential for using the calcium carbonate produced from the carbonation process relies on the purity and variety of the crystal structures that can be achieved. Calcium carbonate could be used in the pulp, plastic, rubber, paint, and paper industries as a filler (instead of clay) and as coating pigments to provide opacity, high brightness, and improved printability due to its good ink receptivity (Eloneva et al, 2008b;Teir, 2008). The most important crystalline forms of calcium carbonates are the rhombohedral calcite type, the orthorhombic acicular aragonite type, and scalenohedral calcite, which are the favoured form in most applications (Imppola, 2000).…”

Investigation of the CO<sub>2</sub> Sequestration by Indirect Aqueous Carbonation of Waste Cement

“…However, utilization of these minerals requires large-scale mining operations, which often face criticism over cost and environmental issues related to exploitation of natural resources. In light of this, there has been increasing interest in mineral carbonation using alkaline industrial wastes such as steel-making slag, waste concrete, asbestosmining tailings, and coal fly ash [6] [7] [8] [9]. However, in general, mineral carbonation is considered to be more expensive than geological storage mainly due to the cost and energy required for pre-treatment, which includes fine grinding and extraction of Mg and Ca from source minerals, as shown in Table 1 [10].…”

Roles of Mineralogical Phases in Aqueous Carbonation of Steelmaking Slag

“…In order to improve the carbonation efficiency, conditions such as higher reaction pressure [8][9][10][11][12] and an acid leaching agent [13][14][15] are adopted. Previous researchers focused on the total carbonation degree of steelmaking slag in their research.…”