Low hydrothermal temperature synthesis of porous calcium silicate hydrate with enhanced reactivity SiO2

Guan, Wei; Ji, Fangying; Fang, Zhuoyao; Fang, Dexin; Cheng, Yong; Yan, Peng; Chen, Qingkong

doi:10.1016/j.ceramint.2013.08.113

Cited by 22 publications

(13 citation statements)

References 20 publications

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“…4a & c, which meant that the dissolution of calcium silicates was faster from PEG-treated slags. Therefore PEG seemed to enhance the solubility of calcium silicates, as reported previously (Guan et al 2013, Guan et al 2014. The increase in Ca 2+ concentrations in all suspensions was accompanied by an increase in pH and in P removal at the beginning of the experiment.…”

Section: Effect Of Peg1000mentioning

confidence: 49%

“…Silicates and calcium-rich solids on the slag surface can be transformed to calcium silicate hydrate (CSH) under hydrothermal conditions (Jing et al 2007, Hosokawa et al 2014. Guan et al (2014) reported that the presence of PEG can effectively prevent the aggregation of small CSH particles during hydrothermal treatment, leading to the formation of CSH with larger surface area. The aim of the modification applied in the present study was to improve the reaction kinetics and the maximum PRC of AOD slag by modifying calcium silicate on the slag surface through hydrothermal treatment with PEG.…”

Section: Peg1000 Modificationmentioning

confidence: 99%

“…A control group was prepared by adding the same amount of slag to deionised water. All suspensions were then placed in a water bath for 2 hours at 80 o C with a stirring rate of 60 rpm and later removed to an autoclave for hydrothermal treatment at 120 o C for 12 hours (Guan et al 2013, Guan et al 2014. The suspension was cooled to room temperature.…”

Section: Peg1000 Modificationmentioning

confidence: 99%

“…If BF slag is modified in an effective way the PRE is higher, since the modified slag surface with its higher porosity tends to release more Ca 2+ and thus facilitate the precipitation of calcium phosphate (Gong et al 2009). Inspired by previous research (Guan et al 2014), a modification process using polyethylene glycol (PEG) was developed in this study, aimed at improving the P removal performance of AOD slag. PEG is a hydrophilic, non-toxic and water-miscible polymer used in controlled-release systems and in nanoparticle preparation Lamprecht 2013, García-Jimeno andEstelrich 2013).…”

Section: Introductionmentioning

confidence: 99%

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Phosphorus removal performance and speciation in virgin and modified argon oxygen decarburisation slag designed for wastewater treatment

et al. 2015

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Argon oxygen decarburisation (AOD) slag may be used for phosphorus (P) removal, as its high pH and weatherable calcium (Ca) minerals provide sufficient Ca 2+ and OH -for calcium phosphate (Ca-PO 4 ) precipitation.This study examined the P removal performance of AOD slag for use as wastewater treatment material. Batch experiments were carried out using both synthetic P solution and real wastewater, followed by chemical modelling and X-ray absorption near edge structure (XANES) spectroscopy. The influences of initial P concentration, slag dose and modification by polyethylene glycol (PEG), an effective agent for generation of 2 porous materials, were investigated to determine the optimal conditions for P removal by AOD slag. It was found that virgin AOD slag removed 94.8% of P from a synthetic P solution in 4 hours and 97.8% in 10 hours.This high P removal was accompanied by a rapid increase in pH from 7.0 to 10.74. The maximum P removal capacity (PRC) from synthetic P solution ranged from 1.3 to 27.5 mg P g -1 . The optimal AOD dose for P removal from wastewater, determined in 8-hour batch experiments, was 25 g L -1. PEG modification increased the reaction rate and resulted in higher final pH, increasing PRC by 47.9%. Combined Visual MINTEQ and XANES analysis for detailed examination of P removal mechanisms revealed that the main P removal mechanism was precipitation of calcium phosphate. According to the XANES analysis, the main Ca-PO 4 precipitate formed on virgin AOD slag under low initial P concentration and high pH was apatite, while brushite was the dominant product at high initial P concentration and low pH.

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Section: Effect Of Peg1000mentioning

confidence: 49%

Section: Peg1000 Modificationmentioning

confidence: 99%

Section: Peg1000 Modificationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Phosphorus removal performance and speciation in virgin and modified argon oxygen decarburisation slag designed for wastewater treatment

et al. 2015

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“…The spectrum of the sample core after acid exposure resembled the unexposed sample. The surface of the CPC was primarily composed of sulfates; the presence of weak bands at 1220 cm (Gunasekaran et al, 2006;Xyla and Koutsoukos, 1989;Ylmen and Jaglid, 2013), the calciumsilicate-hydrate-related Si-O asymmetric stretching (V as Si-O ) in the silicate (SiO 4 −4 ) wide band at 965 cm −1 (Mollah et al, 2000;Taddei et al, 2014) and the three quartz-related bands at 1080, 799 and 693 cm −1 (Guan et al, 2014;Ramasamy and Suresh, 2009;Saikia et al, 2008). The spectrum from the core of the acid-exposed sample was similar to that of the control.…”

Section: Analyses Of Degraded Samples -Atr-ftir Measurementsmentioning

confidence: 99%

Acid resistance of calcium aluminate cement–fly ash F blends

Pyatina

Sugama

2016

Advances in Cement Research

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The short-term resistance to sulfuric acid at 90°C of four calcium aluminate cement (CAC)-fly ash class F (FAF) blends activated with sodium metasilicate (thermal shock resistant cements (TSRCs)), cured at 300°C, was compared to that of a calcium phosphate cement (CPC) (CAC-FAF blend activated with sodium hexametaphosphate) and a Portland cement class G/silica blend. The mechanical properties and compositions of the acid-exposed samples were evaluated by measuring their compressive strength and by means of x-ray diffraction, μEDX (energy-dispersive x-ray spectrometry), thermogravimetric and Fourier transform infrared analyses. All calcium-containing hydrates were sensitive to the conditions of acid exposure. In the TSRC blends, these hydrates included hydrogrossular, feldspar family minerals and zeolites; in CPC, feldspar minerals and phosphate phases; and in the class G/silica blend, portlandite and tobermorite.Crystalline calcium sulfates formed in the acid-exposed surfaces with the exception of the most aluminium-rich TSRC samples where only potassium(sodium) aluminium sulfate, alunite, was detected. This sample underwent the least changes in weight, compressive strength and had the lowest sulfur permeation into the sample core. Calcium sulfates precipitated on sample surfaces limited sulfur penetration into the core of calcium-rich TSRC, CPC and G/silica blends.

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Microwave Hydrothermal Assessment for CSH Formation in Silica-Lime-Water Systems

Tawfik

Abd-El-Raoof

Youssef

et al. 2017

Interceram. - Int. Ceram. Rev.

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Low hydrothermal temperature synthesis of porous calcium silicate hydrate with enhanced reactivity SiO2

Cited by 22 publications

References 20 publications

Phosphorus removal performance and speciation in virgin and modified argon oxygen decarburisation slag designed for wastewater treatment

Phosphorus removal performance and speciation in virgin and modified argon oxygen decarburisation slag designed for wastewater treatment

Acid resistance of calcium aluminate cement–fly ash F blends

Microwave Hydrothermal Assessment for CSH Formation in Silica-Lime-Water Systems

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