Dissolution of steelmaking slags in acetic acid for precipitated calcium carbonate production

Teir, Sebastian; Eloneva, Sanni; Fogelholm, Carl-Johan; Zevenhoven, Ron

doi:10.1016/j.energy.2006.06.023

Cited by 252 publications

(138 citation statements)

References 9 publications

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“…This is the minimum amount of acetic acid required to extract Ca from 1 g of BFS. This value is about half the amount (6-7 mL) previously reported by Teir et al [8]. Based on the amount of leached Ca, the capacity for CO2 sequestration would be 0.43 kg of CO2/kg of BFS.…”

Section: Optimization Of Leaching Parameterssupporting

confidence: 49%

Effects of Experimental Parameters on the Extraction of Silica and Carbonation of Blast Furnace Slag at Atmospheric Pressure in Low-Concentration Acetic Acid

Song

Park

Kim

et al. 2017

Metals

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Blast furnace slag (BFS), a calcium-rich industrial byproduct, has been utilized since 2005 as a mineral carbonation feedstock for CO 2 sequestration, producing calcium carbonate precipitates. In this study, the conditions for the dissolution of Ca and Si in acetic acid, and subsequent carbonation, were elaborated. For this purpose, the retardation of the polymerization of silicon was attempted by varying the concentration of acetic acid, temperature, and leaching time. An inductively coupled plasma (ICP) analysis revealed that both the Ca and Si dissolved completely within 30 min in 5% acetic acid at room temperature. This high dissolution value can be attributed to the fact that Ca was bound to O rather than to Si, as determined by X-ray photoelectron spectroscopy (XPS). The use of CO 2 -absorbed monoethanolamine enabled the complete carbonation of BFS at ambient conditions without the need for a pH swing. The presence of dissolved silica was found to affect the polymorphs of the precipitated CaCO 3 . We believe that this process offers a simple method for manipulating the composites of products obtained by mineral carbonation diminishing the leaching residues.

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Section: Optimization Of Leaching Parameterssupporting

confidence: 49%

Effects of Experimental Parameters on the Extraction of Silica and Carbonation of Blast Furnace Slag at Atmospheric Pressure in Low-Concentration Acetic Acid

Song

Park

Kim

et al. 2017

Metals

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“…Sentetik (çöktürülmüş) kalsiyum karbonat üretiminin değişik yöntemleri olmasına rağmen en çok tercih edileni, saf kireçtaşlarının kalsinasyonu ile üretilendir [4][5][6][7][8]. Özellikle ABD'de uygulanan yönteme göre silisi düşük kireçtaşları yakılarak (kalsine edilerek) önce CaO elde edilir ve suyla karıştırılarak oluşan kireç sütünden bir reaktör içerisinde CO 2 gazı basınç altında (bazı kimyasallar eklenerek) sisteme verilerek tane büyüklüğü (1-3 µm boyutlarında) ve kristal şekli kontrol edilebilen suni ve saf kalsit kristalleri oluşturulması yoluna gidilmektedir.…”

Section: çöKtürülmüş Kalsi̇yum Karbonat üReti̇mi̇unclassified

Çöktürülmüş Kalsiyum Karbonat Üretimi

Kiliç¹

2015

Çukurova Üniversitesi Mühendislik-Mimarlık Fakültesi Dergisi

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ÖzetYapılan çalışmada, kalsiyum hidroksit çözeltisinden çöktürülmüş kalsiyum karbonat (ÇKK) üretimi incelenmiştir. Uygulanan sistem oldukça basit ve çevre dostu bir karbonizasyon prosesidir. Çalışmada Kalsiyum hidroksit çözeltisine karbondioksit püskürtülerek katkı maddesi kullanılmaksızın kalsiyum karbonat (CaCO 3 ) üretimi gerçekleştirilmiştir. Çöktürülmüş kalsiyum karbonat, birbirine yakın tane aralıklarında ve skalenohedral (triangular) kristal şekilli kalsit olarak üretilmiştir. Üretilen sentetik kalsitlerin bileşimi, kristal yapısı/mineralojisi, tane boyutu ve özgül yüzey alanı XRF, XRD, SEM ve mastersizer kullanılarak belirlenmiştir.Anahtar Kelimeler: Sentetik, Kireçtaşı, Kireç, ÇKK, Karbondioksit Production of Precipitated Calcium Carbonate AbstractIn this study, the production of precipitated calcium carbonate (PCC) from a suspension of calcium hydroxide was investigated. The applied system is a simple and eco-friendly carbonation process. Carbon dioxide is blown into a suspension of calcium hydroxide, and the resulting calcium carbonate (CaCO 3 ) is recovered without any additives. Precipitated calcium carbonate is produced as an uniform particle size and a scalenohedral crystalline shaped calcite. The synthesized calcite was analyzed by XRF, XRD, SEM and mastersizer to identify the content, phase, particle size and specific surface area.

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“…Consequently, most studies on the mineral carbonation of BFS have focused on selective Ca dissolution and the production of relatively pure CaCO 3 . Solid residues, including Si, were regarded as impurities [5,6]. Calcium carbonate in this process is a by-product in the sense that it is produced at the end of the process.…”

Section: The Merits Of the Current Processmentioning

confidence: 99%

“…Ever since acetic acid (a weak acid with a pKa = 4.7) was shown to be effective for the extraction of Ca from natural calcium silicates in mineral carbonation reactions [4], it has been used as a mild extraction agent for the selective extracting of Ca from BFS [5][6][7][8][9][10]. Most studies regarding the mineral carbonation of BFS are dedicated to the production of relatively pure CaCO 3 following selective Ca dissolution.…”

Section: Introductionmentioning

confidence: 99%

“…Most studies regarding the mineral carbonation of BFS are dedicated to the production of relatively pure CaCO 3 following selective Ca dissolution. On the other hand, the other major element present in BFS, namely Si, is considered to be a target material to be extracted as silica gel, along with other impurities during acid dissolution processes [5,8,10]. Temperatures above 50 • C are recommended for the extraction of Ca and the removal of Si during the dissolution process [9].…”

Section: Introductionmentioning

confidence: 99%

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Preparation of Silica-Alumina Nanoparticles via Blast-Furnace Slag Dissolution in Low-Concentration Acetic Acid for Carbonation

et al. 2017

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Blast-furnace slag (BFS) has been used as a feedstock for CO 2 sequestration by indirect mineral carbonation to produce calcium carbonate precipitates and solid residues. The most-abundant elements in these residues, Si and Al, are usually considered to be impurities that need to be removed in acid-dissolution processes involving BFS. The co-production of value-added materials from these residues is an attractive option for strengthening the economic competitiveness of mineral carbonation methods. In view of this, we separated the Si and Al, as their hydrated forms, during the dissolution of BFS in acetic acid prior to carbonation. During the sol-gel processing of Si-Al nanoparticles, a catalyst is usually required during the hydrolysis and subsequent condensation processes. In this study, only condensation occurs because the low-concentrations of acetic acid used facilitate in-situ hydrolysis during the dissolution process. Aging was carried out not only to structurally arrange the Si and Al but also to oxidize the marginal Fe(II) to reddish Fe(III). Silica-alumina nanoparticles (78% Si and 22% Al) were prepared by a simple sol-gel route at ambient pressure. These nanoparticles were amorphous and below 20 nm in size. Fourier-transform infrared (FT-IR) studies reveal that the nanoparticles consist of Si-O-Si and Si-O-Al bonds. 27 Al nuclear magnetic resonance (NMR) spectroscopy reveals a significant resonance corresponding to tetra-coordinated Al inside the particle framework.

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Dissolution of steelmaking slags in acetic acid for precipitated calcium carbonate production

Cited by 252 publications

References 9 publications

Effects of Experimental Parameters on the Extraction of Silica and Carbonation of Blast Furnace Slag at Atmospheric Pressure in Low-Concentration Acetic Acid

Effects of Experimental Parameters on the Extraction of Silica and Carbonation of Blast Furnace Slag at Atmospheric Pressure in Low-Concentration Acetic Acid

Çöktürülmüş Kalsiyum Karbonat Üretimi

Preparation of Silica-Alumina Nanoparticles via Blast-Furnace Slag Dissolution in Low-Concentration Acetic Acid for Carbonation

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