Composition of high-calcium fly ash middlings selectively sampled from ash collection facility and prospect of their utilization as component of cementing materials

Sharonova, O. M.; Solovyov, Leonid A.; Oreshkina, Natalia A.; Yumashev, Vladimir V.; Anshits, A. G.

doi:10.1016/j.fuproc.2010.01.003

Cited by 23 publications

(12 citation statements)

References 9 publications

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“…The chemical compositions of SAC and RIOTs were tested by XRF (see Table 1). According to the chemical composition of RIOTs, the basicity R = CaO/SiO 2 was only 0.08, indicating that RIOTs used here was with a very low pozzolanic reactivity [42], and thus it posed a tremendous technical challenge to apply it to cementbased materials.…”

Section: Methodsmentioning

confidence: 98%

Preparation of Micro-Iron Ore Tailings by Wet-Grinding and Its Application in Sulphoaluminate Cement

Yang¹,

Chen²,

Sun³

et al. 2022

Journal of Renewable Materials

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Herein, micro iron ore tailings (micro-IOTs) were prepared by wet-grinding and applied to improve sulphoaluminate cement (SAC) performance. The physicochemical properties of micro-IOTs were investigated by particle size analysis, XRD, and XPS. The hydrates trait and the hydration mechanism of micro-IOTs-SAC composite were studied by XRD, TGA, MIP, and SEM. The results demonstrated that micro-IOTs with an average grain diameter of 517 nm could be obtained by wet-grinding. The setting time of SAC gradually decreased with increasing micro-IOTs content. By adding 2% micro-IOTs, the compressive strengths of SAC pastes were enhanced about 22% and 10% at 4 h and 28 d, respectively. Moreover, the addition of micro-IOTs accelerated ettringite precipitation and changed its morphology, resulting in early strength improvement of the binary system. And increased later strength by micro-IOTs was closely related to the high content of AH 3 , fine pore structure, and high hydration degree of SAC. The findings suggested one new approach to utilize iron ore tailings in cementbased materials.

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Section: Methodsmentioning

confidence: 98%

Preparation of Micro-Iron Ore Tailings by Wet-Grinding and Its Application in Sulphoaluminate Cement

Yang¹,

Chen²,

Sun³

et al. 2022

Journal of Renewable Materials

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“…Class C fly ash has high CaO content (>10%) and presents a hydraulic binder that develops the mechanical properties without the absence of an external source of Ca(OH) 2 [14][15][16].…”

Section: Chemical Content Of Fly Ashmentioning

confidence: 99%

“…Leteći pepeo klase C ima visok sadržaj CaO (>10%) i predstavlja hidraulično vezivo koje razvija mehaničke karakteristike bez prisustva eksternog izvora Ca(OH) 2 [14][15][16].…”

Section: Tabela 2 Prosečan Hemijski Sastav Letećeg Pepela [1]unclassified

Review of contemporary world studies on characteristics of fly ash as a secondary mineral resource: Part 1

Jovanović¹,

Bugarin²,

Magdalinovic³

2013

Min Metal Eng Bor

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“…Sharonova et al conducted a study on the chemical composition, mineral composition and hydration property of high-calcium fly ash collected by the electric precipitator in a power plant. They used a CaO-SiO 2 -Al 2 O 3 phase diagram to analyze all possible mineral formation reactions of the high-calcium fly ash [ 6 ]. Luo Yuping et al performed mineral composition X-ray diffraction (XRD) analyses and cement physical property tests on the combustion residue of the mixed coal powder.…”

Section: Introductionmentioning

confidence: 99%

Experimental study on the relationship between the mineral production capability and the physiochemical properties in the coproduction of Q phase-3CaO·3Al2O3·CaSO4 cement clinker

Tian

et al. 2018

PLoS ONE

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A coproduction tests of quaternary (Q) phase(6CaO·4Al2O3·MgO·SiO2) -3CaO·3Al2O3·CaSO4 cement clinker and an experimental study on the relationship between the mineral production capability and the physiochemical properties are conducted in a two-stage multiphase reaction test bed with Changguang coal. X-ray diffractometer (XRD) analyses are performed on the coproduction clinker samples. The results demonstrate that, with the reduction in particle sizes of the coal powder and the additives and expanded screening level differences between them, both the proportion of Q phase and the mass of 3CaO·3Al2O3·CaSO4 in the clinker increase accordingly. When mixed coal powder particles are prepared through reducing particle sizes and expanding screening level differences between coal powder and additives, the additives CaO and MgO are more likely to be enclosed by coal powder to form globular polymerized particles. In addition, this preparation aids in polymerization and promotes even distribution of CaO, MgO and coal minerals, thus facilitating clinker mineral formation reactions of inorganic substances in the mixed coal powder. Target minerals, such as 2CaO·SiO2 and Q phase, are found in both industrial high-calcium limestone and low-calcium limestone coproduction clinker samples. A diffraction peak of free CaO is also evident in both samples. Compared with a coproduction clinker sample of high-calcium limestone, that of low-calcium limestone exhibits higher diffraction peaks for 2CaO·SiO2 and Q phase. With the current state of the art, it is not yet the optimum choice to substitute CaCO3 for CaO in Q-phase cement clinker coproduction. Before the technology matures and gains practical application, further study on the form and the mixing process of calcium-based additives for cement clinker coproduction will be required.

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Composition of high-calcium fly ash middlings selectively sampled from ash collection facility and prospect of their utilization as component of cementing materials

Cited by 23 publications

References 9 publications

Preparation of Micro-Iron Ore Tailings by Wet-Grinding and Its Application in Sulphoaluminate Cement

Preparation of Micro-Iron Ore Tailings by Wet-Grinding and Its Application in Sulphoaluminate Cement

Review of contemporary world studies on characteristics of fly ash as a secondary mineral resource: Part 1

Experimental study on the relationship between the mineral production capability and the physiochemical properties in the coproduction of Q phase-3CaO·3Al2O3·CaSO4 cement clinker

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