Particle size distribution and structural changes in limestone ground in planetary ball mill

Guzzo, Pedro L.; Santos, Juliano B.; David, Renato C.

doi:10.1016/j.minpro.2013.11.005

Cited by 24 publications

(8 citation statements)

References 24 publications

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“…Natural limestone minerals are the basic raw materials for building industry and for resolving of the environmental protection issues [1]. Namely, the limestone is extensively employed in the interior and exterior as architectural stones and walls, in the production of lime (CaO), as coarse aggregates and fillers in construction composites (concretes and mortars), in paint and polymer fabrication as fillers, as metallurgical flux, in road building (aggregates for highways and runways, railroad ballasts, embankments, soil stabilization agents) [13][14][15]. Since the limestone is able to decrease the CO 2 footprint of concrete by approximately 15 %, it became one of the base materials used in the manufacturing of Portland cement (PC) and one of the most common mineral additions with low reactivity [12,16].…”

Section: Introductionmentioning

confidence: 99%

The chemometric study of limestone physico-chemical properties and thermal behavior for application in construction composites

et al. 2017

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The limestone, as an economically sustainable and easily available basic raw material, is frequently utilized in the building industry for resolving of the environmental protection issues. The limestone is incorporated in a cementitious system either by grinding with cement clinker, or by blending with the binder during concrete production. The employing of powdery limestone as partial cement replacement gives the construction composites with properties comparable to that of conventional concrete. The study of limestone thermal behavior and its chemistry is crucial for the prognosis of the designed composites properties. In this work, the instrumental techniques (atomic emission spectroscopy, differential thermal and thermo-gravimetric analysis, Fourier transform infrared spectroscopy) and the Principal component analysis were employed to discriminate and classify 22 limestone types. The PCA statistical method, as a means of spectra and experimental data fingerprinting, grouped the samples in a multi-dimensional factor space producing four graphical prognosis - one for each instrumental method. DTA/TG peak values varied the most in a short range between 830-870?C, while FTIR spectra showed the highest diversity in the 867-887 cm-1 and 1237-1647 cm-1 ranges. This research was governed by an idea to reveal whether it is possible to differentiate various limestone types and to predict the possibility of their employment in construction composites on the basis of the results of instrumental and mathematical analyses. [Project of the Serbian Ministry of Education, Science and Technological Development, Grant no. ON 172057, III 45008, TR 31055, TR 34006, and TR 34013]

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Section: Introductionmentioning

confidence: 99%

The chemometric study of limestone physico-chemical properties and thermal behavior for application in construction composites

et al. 2017

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“…particles (< 10 µm) with high SSA [19,20]. The nano-grinding process can alter the size, structure, composition, and morphological characteristics of materials by carefully choosing the appropriate parameters [21,22]. To date, little research has been reported on the use of mechanical activation to improve the catalytic properties of solid CaO with a view to biodiesel production [17,23].…”

Section: Introductionmentioning

confidence: 99%

Soybean oil methanolysis over scallop shell-derived CaO prepared via methanol-assisted dry nano-grinding

Panjaitan

Yamanaka

Kuga

2017

Advanced Powder Technology

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Calcium oxides with a specific surface area between 4.5 m 2 g-1 and 62.5 m 2 g-1 were obtained by calcination of scallop shells, following by methanol-assisted dry nano-grinding. Three distinct phases are formed on the surface of these catalysts during nano-grinding: calcium methoxide, calcium hydroxide, and calcium oxide. The effects of specific surface area and active surface phase composition on the catalytic activity of calcium oxide during methanolysis of soybean oil were investigated. The properties of the calcium oxide before, during, and after methanol assisted dry nano-grinding were studied by XRD, FTIR, and nitrogen gas adsorption based on the BET method. The ground calcium oxides were found to be effective in catalyzing the methanolysis of soybean oil, with the optimal catalyst producing a 72.3% ester yield after 20 mins of reaction. The improvements in rate of reaction were attributed to the rapid formation of calcium diglyceroxide during the initial stages of methanolysis. A combination high specific surface area and effective active phases on the surface of the calcium oxide catalysts is correlated with reductions in mass transfer limitations in the early steps of the reaction, indicated by the rapid formation of calcium diglyceroxide.

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“…It was observed that the surface area of the initial HA powder (6.9 m 2 .g -1 ) is increased after undergoing SBM process (23.8 m 2 .g -1 ) while after PBM process the surface area diminished (4.6 m 2 .g -1 ). Logically, an increase in the surface area of the powder would be expected after both milling processes because of a reduction of particle size [35]. However, the obtained values show the contrary in the case of the PBM process.…”

Section: Ha-filled Suspension Preparationmentioning

confidence: 88%

Masked stereolithography of hydroxyapatite bioceramic scaffolds through an integrative approach: From powder tailoring to evaluation of 3D printed parts properties

Navarrete-Segado¹,

Tourbin²,

Francès³

et al. 2021

Preprint

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In this paper, the tailoring of hydroxyapatite powders properties for the preparation of highly hydroxyapatite-loaded photocurable organic slurries was discussed. A methodical study was conducted to investigate suspensions properties and processability to find the most outstanding formulation for the production of hydroxyapatite scaffolds by stereolithography-based additive manufacturing technique. A debinding-sintering process was designed to avoid the formation of cracks during the pyrolysis of the resin and sintering of the ceramic part. A total porosity of 35 vol. % was observed for the scaffolds with an interconnected macroporosity, which could facilitate the flow transport of nutrients necessary to maintain living cells. A compression strength of 4.9±0.3 MPa was obtained for the specimens printed diagonally (45º to the printing stage surface). A slow degradation rate was shown for the printed parts mainly due to the high degree of crystallinity and the intrinsic stability of the hydroxyapatite phase. Our findings indicate that the tailoring of hydroxyapatite powders is needed for better processability as filler in photocurable suspensions. Moreover, it was demonstrated the feasibility of printing hydroxyapatite parts showing promising results for their application in surgery in the case of minor or non-load bearing implants requiring slow resorption properties.

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Particle size distribution and structural changes in limestone ground in planetary ball mill

Cited by 24 publications

References 24 publications

The chemometric study of limestone physico-chemical properties and thermal behavior for application in construction composites

The chemometric study of limestone physico-chemical properties and thermal behavior for application in construction composites

Soybean oil methanolysis over scallop shell-derived CaO prepared via methanol-assisted dry nano-grinding

Masked stereolithography of hydroxyapatite bioceramic scaffolds through an integrative approach: From powder tailoring to evaluation of 3D printed parts properties

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