Influence of vermiculite on the formation of porous cordierites

Valášková, Marta; Martynková, Gražyna Simha; Smetana, Bedřich; Študentová, Soňa

doi:10.1016/j.clay.2009.08.003

Cited by 39 publications

(15 citation statements)

References 31 publications

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“…Some different pore-forming materials such as wood saw dust, polymers, leather residues, polystyrene, organic residues, coal dust, powder limestone, paper-making sludge and mineral additives that act by thermal decomposition and volatilization in brick body have been widely used [4,5,[11][12][13][14][15][16][17][18] Also heat-resistant porous materials such as diatomite, zeolite, vermiculite and perlite have been evaluated in the ceramic brick structures [6,[19][20][21][22][23][24][25].…”

Section: Introductionmentioning

confidence: 99%

Characteristics of fired clay bricks with pumice additive

Gençel

2015

Energy and Buildings

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Section: Introductionmentioning

confidence: 99%

Characteristics of fired clay bricks with pumice additive

Gençel

2015

Energy and Buildings

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“…The temperature range of ΔT 2 = 407–437 °C, accompanied by a mass loss of approximately 6.58 ± 0.30%, was assigned to dehydroxylation of kaolinite and a continuing dehydration and dehydroxylation of vermiculite. Vermiculite dehydroxylated and crystallized to enstatite at about 835 °C at the temperature range ΔT 3 = 745–848 °C (marked E in Figure 4) [33,34]. The exothermal reactions in the range ΔT 4 = 905–1017 °C and maximum peaks at T 4max = 960–972 °C have been attributed to the formation of MgAl 2 O 4 spinel and μ-cordierite [35,36].…”

Section: Resultsmentioning

confidence: 99%

Crystallization and Quantification of Crystalline and Non-Crystalline Phases in Kaolin-Based Cordierites

et al. 2019

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Kaolin is most often used as traditional raw material in ceramic industry. The purpose of the study was to obtain understanding of the structural and chemical variability of cordierite ceramics influenced by chemical and mineralogical properties of six raw kaolins taken from different localities when they are applied in ceramics mixtures with vermiculite and sintered up to 1300 °C. The X-ray diffraction and simultaneous thermogravimetric and differential thermal analysis were used to identify and characterize crystalline mineral phases and the course of reactions during the heating. The percentages of the crystalline and non-crystalline phases were newly determined by recalculation of the bulk chemical analyses of kaolins and cordierite ceramics using Chemical Quantitative Mineral Analysis (CQMA) method. Varying amounts of minerals in kaolins: kaolinite from 73.3 to 85.0, muscovite from 4.2 to 9.9, and quartz from 6.0 to 19.5 (mass %) affected amount of cordierite/indialite from 75.2 to 85.1, enstatite from 5.8 to 8.9 (when are calculated as their maximal possible percentages), and non-crystalline phases from 8.8 to 15.1 (mass %) in cordierite ceramics. Regression analysis predicted high relationship between quantity of: (a) kaolinite in kaolins and crystalline cordierite and (b) quartz in kaolins and non-crystalline phases in the ceramics. The migration of potassium from muscovite into the cordierite structure, melting point and crystallization of cordierite/indialite phases and pore size variability in relation to impurity of kaolins are documented and discussed.

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“…The melting point of vermiculite is 1350 o C whereas the maximum sintering temperature is 1260 o C. This is why vermiculite is considered for the production of insulating material and fireproof products [10]. However, there is very limited information on the use of vermiculite in ceramic production particularly in the porcelain insulators [11]. Vermiculite is readily available and is found in Kalalani village in Korogwe Tanga and Nyang'wambe village in Mikese Morogoro in Tanzania.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Kalalani vermiculite for production of high strength porcelain insulators

Ngayakamo

Park

2019

SCI SINTER

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The present work has evaluated Kalalani vermiculite as a potential raw material for the production of high strength porcelain insulators. Three porcelain compositions were prepared to contain 0, 20 and 30 wt% of Kalalani vermiculite. Porcelain samples were fabricated using a semi-drying method. The chemical, mineralogical phases and microstructural characterization of the raw materials were carried out using XRF, XRD, and SEM techniques, respectively. Water absorption, bulk density, dielectric and bending strengths were performed on porcelain samples fired up to 1300 o C. However, at the sintering temperature of 1250 o C, the porcelain sample with 20 wt% of Kalalani vermiculite gave the dielectric strength of 61.3 kV/mm, bending strength of 30.54 MPa, bulk density of 2.21 g/cm 3 and low water absorption value of 0.21 % which is the prerequisite properties for high strength porcelain insulators. It was therefore concluded that Kalalani vermiculite has the potential to be used for the production of high strength porcelain insulators.

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Influence of vermiculite on the formation of porous cordierites

Cited by 39 publications

References 31 publications

Characteristics of fired clay bricks with pumice additive

Characteristics of fired clay bricks with pumice additive

Crystallization and Quantification of Crystalline and Non-Crystalline Phases in Kaolin-Based Cordierites

Evaluation of Kalalani vermiculite for production of high strength porcelain insulators

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