High- and low-defect kaolinite for brick making: Comparisons of technological properties, phase evolution and microstructure

Wang, Sen; Gainey, Lloyd

doi:10.1016/j.conbuildmat.2022.130250

Cited by 14 publications

(12 citation statements)

References 52 publications

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“…In contrast, the ORL2 fragment (Figure 14A) presents a more zoned and grey colour, which could indicate a reducing-oxidising-reducing firing environment; in other words, the fragment may be from conditions that were not well controlled or from burial environments over the centuries. The pink colour of the VAS2 ceramics is due to the presence of Fe in the form of hematite and the high concentration of Ca, which reduces the reddening effect of iron oxides [31]. The ceramic bodies of the fragments are characterised by a CaO amount that is higher than 7-8%, which allows them to be included in the classification of calcareous ceramics [9].…”

Section: Discussionmentioning

confidence: 99%

Archaeometric Investigations on Archaeological Findings from Palazzo Corsini Alla Lungara (Rome)

de Caro,

Susanna,

Fraiegari

et al. 2024

Ceramics

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This study reports the analytical investigations on clayey and ceramic finds, characterised by high variability in terms of prime materials, with the aim to determine the role of this important ceramic production situated close to the city walls, fortuitously found during service excavations developed in the garden of Palazzo Corsini in Rome. The complexity of the finds led to the choices of appropriate methodologies and techniques suitable for defining the diagnostic elements of each find. Optical microscopy (OM) combined with micro-Raman (µ-Raman) spectroscopy, X-ray diffractometry (XRD), scanning electron microscopy with energy-dispersive X-ray spectroscopy (SEM/EDS), and differential thermal analysis (DTA) were used to analyse the nature and microstructure of the ceramic and burned clay that were found. In such a complicated setting, the objective of conducting chemical analyses is to provide clues to describe the various kinds of ceramics produced, the production and processing methods, and, as a result, the typology of the workshop.

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Section: Discussionmentioning

confidence: 99%

Archaeometric Investigations on Archaeological Findings from Palazzo Corsini Alla Lungara (Rome)

de Caro,

Susanna,

Fraiegari

et al. 2024

Ceramics

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“…, and a small amount of hematite (Fe 2 O 3 ). After heat treatment at 400 • C, diaspore obtained from bauxite was dehydrated to form free Al 2 O 3 , and kaolinite partially lost structured water to form metakaolinite (Al 2 O 3 •2SiO 2 ) [28]. After heat treatment at 600 • C, the free aluminosilicate in the sample generated muscovite according to the obvious diffraction peaks of the muscovite (KAl 2 [(Si,Al) 4 O 10 ](OH) 2 ) phase that appeared in the XRD.…”

Section: Composition and Phase Analysis Of Bauxite Tailingsmentioning

confidence: 99%

Preparation and Performance of Ferric-Rich Bauxite-Tailing-Based Thermal Storage Ceramics

Wang,

Fang,

Min

et al. 2023

Materials

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In recent years, regenerative thermal oxidizer (RTO) has been widely used in the petroleum industry, chemical industry, etc. The massive storage required by solid waste has become a serious problem. Due to their chemical composition, bauxite tailings as raw materials for high-temperature thermal storage ceramics show enormous potential in the fields of research and application. In this study, we propose a method for preparing ferric-rich and high specific storage capacity by adding Fe2O3 powder to bauxite tailings. Based on a 7:3 mass ratio of bauxite tailings to lepidolite, Fe2O3 powder with different mass fractions (7 wt%, 15 wt%, 20 wt%, 30 wt%, and 40 wt%) was added to the ceramic material to improve the physical properties and thermal storage capacity of thermal storage ceramics. The results showed that ferric-rich thermal storage ceramics with optimal performance were obtained by holding them at a sintering temperature of 1000 °C for 2 h. When the Fe2O3 content was 15 wt%, the bulk density of the thermal storage ceramic reached 2.53 g/cm3, the compressive strength was 120.81 MPa, and the specific heat capacity was 1.06 J/(g·K). This study has practical guidance significance in the preparation of high thermal storage ceramics at low temperatures and low costs.

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“…By considering the growing need for efficient and cost-effective CO 2 adsorbents, the work presented here deals with the synthesis of a zeolite A and a zeolite X from a natural aluminosilicate (kaolinite). These samples were both tested as solid adsorbents for the adsorption of CO 2 at low gas pressures (≤1 bar) and 25 • C. Kaolinite is a largely available natural clay, featuring a layered structure based on a silicate tetrahedral layer and an aluminium-based octahedral layer according to the so-called TO (or 1:1) structure [11,[23][24][25]. Its mineralogical composition is Al 2 Si 2 O 5 (OH) 4 .…”

Section: Introductionmentioning

confidence: 99%

Zeolites Derived from Natural Kaolinite for CO2 Adsorption

Celoria,

Begni,

Paul

et al. 2024

Processes

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This manuscript deals with the synthesis of different types of zeolites from natural kaolinite samples for CO2 adsorption. A zeolite A was prepared from kaolinite by means of an alkaline fusion process, followed by hydrothermal treatment, whereas a highly crystalline zeolite X was synthesized by optimizing the previously mentioned synthetic procedure. In detail, the SiO2/Al2O3 molar ratio in the preliminary mixture was modified with the addition of a secondary silicon source (sodium silicate) in order to obtain the one required for zeolites X. The physicochemical properties of the pristine clay and of the different zeolites were investigated by means of a multi-technique approach, including XRPD; SEM-EDX; 23Na, 27Al and 29Si MAS NMR spectroscopy; and N2 physisorption analysis at 77 K. Since the Si and Al molar ratios and reactivities are key parameters for the synthesis of zeolites, these aspects, primarily related to the use of a naturally occurring aluminosilicate as the raw material, have been investigated for their correlation with the physicochemical properties of the synthetic products. Moreover, by means of a custom-built volumetric apparatus, the CO2 adsorption capacity of the resulting zeolites at low gas pressures (<1 bar) and at 25 °C was assessed.

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High- and low-defect kaolinite for brick making: Comparisons of technological properties, phase evolution and microstructure

Cited by 14 publications

References 52 publications

Archaeometric Investigations on Archaeological Findings from Palazzo Corsini Alla Lungara (Rome)

Archaeometric Investigations on Archaeological Findings from Palazzo Corsini Alla Lungara (Rome)

Preparation and Performance of Ferric-Rich Bauxite-Tailing-Based Thermal Storage Ceramics

Zeolites Derived from Natural Kaolinite for CO2 Adsorption

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