Formation of Clinker Containing Lithium

Staněk, Theodor; Rybová, Alexandra; Zezulová, Anežka; Boháč, Martin

doi:10.4028/www.scientific.net/msf.955.50

Cited by 6 publications

(4 citation statements)

References 9 publications

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“…Recently, it has been discovered that lithium additionally causes the alite to decompose into a microcrystalline mixture of belite and free lime, depending on its content in clinker and the clinker cooling rate. At the same time, cement prepared from clinker with 1 wt.% Li 2 O burned at 1350°C showed the same technological parameters as conventional OPC (Ordinary Portland cement) 10,11 …”

Section: Introductionmentioning

confidence: 71%

“…At the same time, cement prepared from clinker with 1 wt.% Li 2 O burned at 1350 • C showed the same technological parameters as conventional OPC (Ordinary Portland cement). 10,11 Kakali et al 12 found out that the addition of CuO affects the formation of silicates and aluminates. CuO mainly promotes the formation and growth of alite crystals at lower temperatures and alters the crystallisation processes upon cooling clinker.…”

Section: Introductionmentioning

confidence: 99%

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The effect of the combined addition of copper, lithium and sulphur on the formation of Portland cement clinker

Staněk,

Rybová,

Boháč

et al. 2024

Journal of Microscopy

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Both copper and lithium act as strong fluxes and lower the temperature of the clinker melt formation. Sulphur promotes the stabilisation of more hydraulically active modification of alite M1. It is expected that this combination could produce an alite clinker at significantly lower temperatures with high quality technological parameters. In this paper, the effect of combined oxides of copper, lithium and sulphur addition on the phase composition and clinker structure of Portland cement was investigated. The reference raw meal was prepared from common cement raw materials. Each of the mentioned oxides was added to the reference raw meal in two different concentrations, and 8 combinations were prepared. Chemically pure compounds (NH4)2SO4, CuO and Li2CO3 were used as a source of these oxides. The raw meals were burned to equilibrium at 1450°C. Their phase composition was determined by X‐ray diffraction analysis, the microstructure was monitored by optical microscopy, and the microchemistry of the clinker phases was observed by electron microscopy with EDS analysis. It was found that in samples with high lithium or copper content, there is an increase in belite and free lime at the expense of alite. The combination of Cu + Li has the most negative effect, followed by Li alone and Cu alone. The higher SO3 content slightly offsets this negative effect.

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Section: Introductionmentioning

confidence: 71%

Section: Introductionmentioning

confidence: 99%

The effect of the combined addition of copper, lithium and sulphur on the formation of Portland cement clinker

Staněk,

Rybová,

Boháč

et al. 2024

Journal of Microscopy

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“…Given the error that the Rietveld refinement has, this difference is negligible. Recent study [22] clarifies this effect of Li by significant reduction in the temperature of the clinker melt formation and a decrease in its viscosity. Lithium causes a partial to complete decomposition of the alite into microcrystalline mixture of belite and free CaO depending on Li 2 O content and cooling rate.…”

Section: Phase Analysismentioning

confidence: 94%

Early hydration of C2S doped with combination of S and Li

et al. 2020

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Production of low-energy cements would result in energy saving and lower CO 2 emissions related to reduced consumption of fuel and high-grade limestone as a raw material. Belite rich clinker, made more reactive by doping with combination of S and Li, could possibly be one of the low-energy alternatives for Portland cement clinker. Paper describes the preparation of doped belite and deals with its early hydration and reactivity. Belite rich clinkers were prepared in laboratory in high-temperature solid state synthesis. Pure substances were used for the preparation of raw meal and clinker. Early hydration heat flow development of cement pastes was monitored by isothermal calorimetry, changes in phase composition by "in situ" X-ray diffraction and TGA/DTA and microstructure by SEM-SE. Heat flow exotherms were correlated with quantified phase composition at given time. Intensity and position of main exothermic peak related to hydration of C 3 S is changing with increasing Li content. Doping of the C 2 S by the S or the combination of S and Li significantly increases the reactivity of the C 2 S-rich cement. The formation of C-S-H products is a continuous process that depends mainly on C 3 S during first 6 h and then is supported by slow reaction of β-C 2 S. The reactivity of C 2 S is affected by the timing of the hydration of other clinker phases. Two generations of portlandite formation detectable as a double endotherm on TGA/DTA can be attributed to hydration of C 3 S and β-C 2 S.

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“…The main components are quicklime, a source of SiO2 and various activators. As activators, Li and Cu were chosen, based on previous works [10,11], followed by KOH and sodium phosphate.…”

Section: Introductionmentioning

confidence: 99%

Low-temperature synthesis of binder with belite content

Staněk,

Rybová,

Khongová

et al. 2023

J. Phys.: Conf. Ser.

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Sol-gel methods or hydrothermal treatment in combination with low-temperature burning are used for low-temperature syntheses of hydraulically active dicalcium silicate. The paper describes a two-stage preparation process without the use of an autoclave. In the first phase, the precursors of hydraulically active phases are prepared. In the second phase, burning up to 1000 °C takes place to form a C2S-based binder. Unlike commonly used procedures of the sol-gel method, solid raw materials and water are used. The main raw materials are quicklime and a source of SiO2 and then various activators. X-ray diffraction analysis and electron microscopy methods were used for the research. The resulting binders are similar to hydraulic lime, they achieve low initial strengths, the long-term strengths are satisfactory. It is suitable for the preparation of mortars and plaster mixtures.

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Formation of Clinker Containing Lithium

Cited by 6 publications

References 9 publications

The effect of the combined addition of copper, lithium and sulphur on the formation of Portland cement clinker

The effect of the combined addition of copper, lithium and sulphur on the formation of Portland cement clinker

Early hydration of C2S doped with combination of S and Li

Low-temperature synthesis of binder with belite content

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