Effects of calcination on silica phase transition in diatomite

Zheng, Renji; Ren, Zijie; Gao, Huimin; Zhang, Anling; Bian, Zheng

doi:10.1016/j.jallcom.2018.05.010

Cited by 72 publications

(28 citation statements)

References 16 publications

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“…19 The amorphous phase of opal (SiO 2 $nH 2 O) is reected by the peak at 21 , which can be seen in the XRD pattern of diatomite. 9 The typical characteristic peaks of hydroxides at 9.96 , 20.05 and 30.24 are attributable to the Cu/Al-LDH structure, which is similar to the result we previously reported. 16 Thus, we conclude that diatomaceous earth has no impact on the hydrothermal preparation of copper aluminium hydroxides.…”

Section: Catalytic Ldpe Pyrolysissupporting

confidence: 89%

“…8 Diatomite is a fossil of single-cell aquatic plants (algae), which consists of a porous diatom skeleton and an Si-O tetrahedral interconnected network with excellent features such as low density, high surface area and large adsorption capacity. [9][10][11][12][13] Layered double hydroxides (LDH) which are one type of layered materials with many outstanding catalytic behaviors, such as activity, selectivity and stability of active sites that have been extensively studied. [14][15][16][17][18][19][20][21] LDH has been applied as an adsorbent and precursor of well-mixed oxides in various catalytic reactions.…”

Section: Introductionmentioning

confidence: 99%

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Diatomite/Cu/Al layered double hydroxide hybrid composites for polyethylene degradation

Zhang

et al. 2020

RSC Adv.

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Section: Catalytic Ldpe Pyrolysissupporting

confidence: 89%

Section: Introductionmentioning

confidence: 99%

Diatomite/Cu/Al layered double hydroxide hybrid composites for polyethylene degradation

Zhang

et al. 2020

RSC Adv.

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“…The literature results indicated that such a calcination temperature slightly exceeds the temperature of the structural transition from β and α quartz (573°C), simultaneously being considerably lower than the temperatures of significant alterations of other minerals. During such a calcination, the surface-bound water and an organic substance should be removed, whereas clay minerals dehydroxylated and partly decomposed (Yılmaz & Ediz 2008, Zhi-Yang et al 2009, Ediz et al 2010, Posi et al 2014, Zheng et al 2018. Melting of clay minerals in pores was also reported to start at 600°C (Zhi-Yang et al 2009).…”

Section: Methodsmentioning

confidence: 99%

The impact of calcination on changes in the physical and mechanical properties of the diatomites of the Leszczawka Member (the Outer Carpathians, Poland)

Figarska-Warchoł

Rembiś

Stańczak

2020

geol

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The work concerned the effects of the thermal treatment of diatomites from the Jawornik deposit (an example of the diatomites of the Leszczawka Member of the Polish Outer Carpathians). Five distinct lithological varieties were subjected to calcination at 600°C in ambient air.The thermal impact induced the following changes to the rocks. Their overall rock porosity increased, most distinctly in the initially softer varieties, and the internal pores of the siliceous frustules themselves usually became larger due to the initial melting of the silica phases. Most of the diatoms, quartz and feldspars cracked as a result of their brittle fracturing under compressive strain resulting from substantial and differing size changes of growing grains. Clay minerals were thermally transferred, changing their volume. The organic matter dispersed through-out the diatomites was partly oxidized and removed. At the same time, the structure of the rocks was strengthened, as confirmed by an increase in their microhardness. The microhardness of soft and porous diatomite varieties increased considerably on heating, but that of the hard and compact variety changed to a smaller degree. The increase is directly related to the content of the clay minerals. The impact of other mineral components was not detected. The calcination of lithologically diversified diatomites provided the mineral with raw material with deicing and antisliding properties. The technology of its production has been determined by the authors and submitted as a patent.

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“…Los prototipos sinterizados por encima de 950 °C (Fig. 7c) presentaron una superficie más consolidada, sus cambios morfológicos obedecen a dos aspectos: las transformaciones de fase que suceden por encima de los 900 °C y la posterior aglomeración de partículas que origina un cuerpo cerámico mucho más denso [39,40]. Para este rango de temperaturas se observó en la superficie poros interconectados y aislados.…”

Section: Análisis Microestructuralunclassified

Microstructure, physical and mechanical properties of kaolin–diatomite composite reinforced with CaCO3•

Bohórquez

López

Páez

et al. 2019

DYNA

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The present work reports the microstructure, physical and mechanical properties of a material composed of kaolin, diatomite and calcium carbonate reinforcement (CaCO3). The ceramic prototypes were shaped by the slip casting method and sintered at temperatures between 800 °C and 1100 °C. The morphology and average pore size was analyzed by Scanning Electron Microscopy (SEM) and the mineralogical phases were determined by X-Ray Diffraction (XRD). The apparent density was established by the mercury immersion method according to the E – 8B Standard of the Institute of Ceramic Technology (ITC); the percentage of absorption was determined by the boiling method according to ISO 10545-3 standard; linear contraction was studied in three directions: long, wide and high. The study of the mechanical resistance to compression followed the procedure established at ASTM C773–88 standard and the breaking modulus was calculated by the three-point bending test, according to ISO 10545–4. Results show that the material structure is affected with increasing temperature reporting a decrease in quartz phase from 51.16 % to 33.81 %. Percentage of absorption revealed its most significant variation between 950 °C and 1100 °C with a decrease of 21 % approximately. Mechanical resistance values showed wide dispersion which was attributed to the different orientations in which the material failed during each test. According to the pore diameters found, the compound is characterized by being macro and mesoporous facilitating its application in catalysis, photochemistry, microelectronics and other microfiltration media

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Effects of calcination on silica phase transition in diatomite

Cited by 72 publications

References 16 publications

Diatomite/Cu/Al layered double hydroxide hybrid composites for polyethylene degradation

Diatomite/Cu/Al layered double hydroxide hybrid composites for polyethylene degradation

The impact of calcination on changes in the physical and mechanical properties of the diatomites of the Leszczawka Member (the Outer Carpathians, Poland)

Microstructure, physical and mechanical properties of kaolin–diatomite composite reinforced with CaCO3•

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