Reactivity of limestones from different sources in Turkey

Hoşten, Çetin; Gulsun, M

doi:10.1016/j.mineng.2003.10.009

Cited by 38 publications

(22 citation statements)

References 2 publications

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“…calcite) concentrations in general result in higher (initial) reactivities, which is in agreement with previous observations. [6,10] Calcareous samples with high silicon concentrations display lower dissolution rates.…”

Section: Spectroscopymentioning

confidence: 99%

“…Some dolomite and magnesian calcite are proposed to have dissolved along with calcite, although it is known from previous studies that dolomite (CaMg (CO 3 ) 2 ) inhibits limestone dissolution. [7,10] However, it has been reported that greater magnesium content may increase the dissolution rate, [6] which was attributed to the influence of the source of the sample. We could not study this because of low amounts of magnesium in all our samples.…”

Section: Spectroscopymentioning

confidence: 99%

“…In studies for the influence of experimental parameters, it has been found that the dissolution rate of limestone is enhanced by a decrease of pH, [6,8,9] decrease of particle size [6,10] and increase of reaction temperature. [6] Influence of chemical composition often focuses on the amounts of calcium and magnesium.…”

Section: Introductionmentioning

confidence: 99%

“…[6] Influence of chemical composition often focuses on the amounts of calcium and magnesium. It has been shown that greater proportion of calcium and lower proportion of magnesium increase the dissolution rate, [6,10] although some exceptions can be found. [6] Siagi et al [6] explained the exceptions by proposing that the source of the sample could play an important role in the dissolution rate.…”

Section: Introductionmentioning

confidence: 99%

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XPS and SEM study of calcite bearing rock powders in the case of reactivity measurement with HCl solution

Järvinen

Leiro

Bjondahl

et al. 2011

Surface & Interface Analysis

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The dissolution of seven natural limestones and calcareous rocks in hydrochloric acid solution was examined to investigate their capability for wet flue gas desulphurisation. All samples were crushed, ground and sieved to a size-fraction of 150-250 mm. Thereafter they were subjected to a dissolution experiment utilising stepwise titration with hydrochloric acid. The dissolution rates of three calcareous rocks were found to be controlled by reaction kinetics, while the limestones showed mass transfer control. The surface characterisation was implemented before and after dissolution experiments using X-ray photoelectron spectroscopy and scanning electron microscopy. Additional characterisation was carried out with X-ray diffraction, X-ray fluorescence and polarizing microscope. Initial reactivities have been shown to decrease in the order limestone, calcareous rock with high calcium concentration, calcareous rock with low calcium concentration. Coarse grain structure is proposed to decrease the initial reactivity.

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Section: Spectroscopymentioning

confidence: 99%

Section: Spectroscopymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

XPS and SEM study of calcite bearing rock powders in the case of reactivity measurement with HCl solution

Järvinen

Leiro

Bjondahl

et al. 2011

Surface & Interface Analysis

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show abstract

“…However, higher magnesium content did not automatically result in lower reactivity among the samples, which was attributed to the source of the sample. [19] In addition, Hoşten and Gülsün [18] discovered that 4.79 wt% of MgCO 3 did not have notable influence on the reactivity, while 9.39 wt% of MgCO 3 caused a clear decrease-a more pronounced one with a smaller size fraction. In this study, the amount of magnesium (or any other element) was not observed to have a correlation with the initial reactivities.…”

Section: Discussionmentioning

confidence: 99%

Characterisation of dolomites before and after reactivity measurement with HCl solution

Järvinen

Leiro

Bjondahl

et al. 2014

Surf. Interface Anal.

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aThe aim of this study was to compare different types of dolomites through batch reactivity experiments between HCl and dolomite powders, and ex-situ characterisation of the particles before and after dissolution. Sedimentary dolomites were observed to have higher initial reactivities than metamorphic ones with sufficiently low calcite concentrations (<6% according to our regression model). In addition, the initial reactivities of the metamorphic dolomites were dependent on calcite concentration and could exceed those of the sedimentary dolomites. A regression model is presented for the dependence of initial reactivity on mineral composition and type of origin (sedimentary/metamorphic). The samples with the highest initial reactivities had also the largest BET (Brunauer, Emmet, Teller) surface areas obtained with nitrogen physisorption. Yet our data indicates that mineral composition of the dolomite has a greater influence on the initial reactivity than the BET surface area. Furthermore, it was found that the surface of sedimentary dolomites, unlike the surface of metamorphic dolomites, becomes porous during dissolution.

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Limestone dissolution in flue gas desulfurization—experimental and numerical study

Souza

Santos

Souza

et al. 2010

J of Chemical Tech & Biotech

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BACKGROUND: Wet FGD technologies account for around 87% of such systems worldwide, particularly those that use limestone as the absorbent. This technique is widely used in large thermal power stations. Limestone reactivity is one of the parameters that most influence the yield of the FGD process. With the aim of improving the design and operation of desulfurization units, many studies have been carried out to investigate the rate of limestone dissolution.

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Reactivity of limestones from different sources in Turkey

Cited by 38 publications

References 2 publications

XPS and SEM study of calcite bearing rock powders in the case of reactivity measurement with HCl solution

XPS and SEM study of calcite bearing rock powders in the case of reactivity measurement with HCl solution

Characterisation of dolomites before and after reactivity measurement with HCl solution

Limestone dissolution in flue gas desulfurization—experimental and numerical study

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