The effects of mechanical activation on the sintering and microstructural properties of cordierite produced from natural zeolite

Tunç, Tuğba; Demirkıran, A. Şükran

doi:10.1016/j.powtec.2014.03.069

Cited by 41 publications

(10 citation statements)

References 31 publications

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“…The cordierite phase was obtained at 1150 ℃. Whereas, our previous studies on non-activated powders of zeolite+ Al 2 O 3 +MgO indicate that cordierite phase cannot be obtained at temperatures up to 1400 ℃ [26]. It might be originated from using the stored energy that was obtained from mechanical activation process in the particulate system.…”

Section: Characterization Of Sintered Samplesmentioning

confidence: 90%

“…In literature, starting materials for cordierite production are presented as magnesium compounds and kaolinite mixture; alkaline-earth alumina silicate glass, kaolinite, alumina and magnesite; talc, calcined alumina and fly ash; kaolinite, talc, silica and alumina; talc, kaolinitic clay and gibbsite; kaolinite, talc and magnesium oxide; talc, kaolinite, silica, sepiolite and feldispar; kaolinite and talc [25]. However, there is no study about cordierite ceramic produced from zeolite, so far [26].…”

Section: Introduction mentioning

confidence: 99%

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Zeolite usage as source of silica to produce cordierite in MgO–Al2O3–SiO2 system

Parlak

Demirkıran

2018

J Adv Ceram

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In this study, natural zeolite was used as source of silica to produce cordierite. MgO and Al 2 O 3 were added to zeolite to obtain the cordierite stoichiometry. Mixture of these raw materials was mechanically activated for different durations. The mechanically activated powder mixture was characterized using XRD, DSC, SEM, specific surface area, and particle size analyzer. The pycnometer method was used to measure the densities of mechanically activated powder mixtures. Mechanically activated for 60 min powder mixture was sintered at 1150-1350 ℃ for 1 h. The sintering behavior of the samples was determined by measuring the linear shrinkage, density, and apparent porosity. The phases in the sintered samples were identified by XRD. Cordierite and spinel phases were detected for sintered at a temperature higher than 1150 ℃ but corundum accompanied to cordierite and spinel at 1150 ℃. The microstructure of the samples was examined using both SEM and AFM. The sintering behavior and microstructural properties of the samples changed with an increase in the sintering temperature. As the apparent porosity increased with increasing sintering temperature, linear shrinkage and density values decreased. Density values were determined as 2.31-2.69 g/cm 3 depending on the temperature. The grains coarsened at higher temperature and the average grain size depending on the temperature was 1.34-1.96 μm. From the results optimum sintering temperature was determined as 1250 ℃. Dense material was produced at a temperature as low as 1250 ℃ using zeolite as raw material.

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Section: Characterization Of Sintered Samplesmentioning

confidence: 90%

Section: Introduction mentioning

confidence: 99%

Zeolite usage as source of silica to produce cordierite in MgO–Al2O3–SiO2 system

Parlak

Demirkıran

2018

J Adv Ceram

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“…Demirkıran ve ark. [9] zeolit, MgO veAl2O3 toz karışımının 600 dev/dk hızında 0,5, 1 ve 2 saat süre ile 1:20 toz/bilye oranını ile mekanik olarak aktivasyonu sonrası benzer şekilde oluşan topaklanma eğiliminden bahsetmişlerdir. Buzimov ve ark.…”

Section: Deneysel çAlişma (Experimental)unclassified

“…Yapısında Na + , K + , Ca 2+ ve Mg 2+ gibi alkali ya da toprak alkali yükleri içerirler [8]. Zeolitler çeşitli türde seramiklerin üretiminde hammadde olarak kullanılmaktadırlar [9][10][11]. Mermer tozu, mermer blokları şekillendirme sürecinde ortaya çıkan bir atık malzemedir.…”

Section: Gi̇ri̇ş (Introduction)unclassified

Effect of mechanical activation on CAS ceramics from produced using zeolite and marble powder

Merkit

Özarslan²,

Aydin³

et al. 2018

Sakarya University Journal of Science

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Bu çalışmada CAS (CaO-Al2O3-SiO2) easlı seramikler zeolit, mermer tozu ve alümina tozları kullanılarak; 400 ve 600 dev/dk hızlarında mekanik aktivasyon ile üretilmiştir. Aktive edilen tozlar hidrolik pres yardımı ile şekillendirildikten sonra 1000-1200 o C sıcaklık aralığında 1 ve 5 saat süre ile sinterlenmiştir. Aktivasyon öncesi ve sonrası tozların ve sinterlenmiş ürünlerin faz analizi XRD yöntemi ile belirlenmiştir. Mikroyapı analizleri SEM ile gerçekleştirilmiştir. Aktivasyon sonrası tozlarda amorflaşma tespit edilmiş, aktivasyon hızının artması tane boyutunu düşürmüş bununla beraber aglomerasyon oluşmuştur. Sinterleme sonucunda gözenekli bir yapı oluşmuş; sıcaklık 1200 o C'ye çıktığında gözenek boyutları belirgin bir şekilde artmıştır.

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“…During mechanical milling, through repeated welding and fracturing of powder particles, mechanical activation increases the specific surface area, forms fresh surface areas in those materials and destroys the minerals' stable crystalline structure (Deris et al, 2014;Terzicá et al, 2015). There have been several recent studies on the synthesis or modification of materials by means of mechanical activation and most of the synthesized or modified materials exhibited useful properties (Shin et al, 2013;Choi et al, 2014;Tunç & Demirkıran, 2014;Tikhov et al, 2015). To the authors' knowledge, modification of bentonite-based layered materials, in particular metal oxide-pillared bentonite material, for use in a Fenton-like process by mechanical activation, has rarely been reported previously.…”

mentioning

confidence: 99%

Effect of mechanical activation on catalytic properties of Fe₂O₃-pillared bentonite for Fenton-like reaction

Wei

Zhang

et al. 2017

Clay miner.

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A layered composite of Fe2O3-pillared bentonite (Fe-P-Bet), used as a catalyst in a Fenton-like process, was prepared and then its mechanical activation was studied in detail. The optimum conditions for preparation of Fe-P-Bet and the effects of mechanical activation on the catalytic activity of Fe-P-Bet were investigated systematically. The impact of the mechanical activation on the catalytic activity was affected by the filling ratio of the grinding medium, by the combination of different sized milling balls, by the rotation speed of the planet carrier, by the milling time and by the powder-to-ball ratio. Compared with the removal ratio of orange II of 14.5%, catalysed by Fe-P-Bet, the removal ratio catalysed by activated Fe2O3-pillared bentonite (A-Fe-P-Bet) was as high as 93.6%, and A-Fe-P-Bet had the merit of good stability and only a small amount of Fe leaching during the Fenton-like process. The catalysts prepared were characterized by scanning electron microscopy, transmission electron microscopy, X-ray diffraction and by the BET method; A-Fe-P-Bet has a small particle size and a rough surface. The lattice distortion and decrease in the crystal size of α-Fe2O3, as well as damage to the layer structure of smectite in the bentonite, were the main reasons for the increase in the catalytic activity of A-Fe-P-Bet. The results indicated that mechanical activation was an easy and effective method for improving the catalytic activity of this bentonite-based layered composite and that A-Fe-P-Bet was a safe, ‘green’, catalyst material for use in Fenton-like oxidation during treatment of wastewater.

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The effects of mechanical activation on the sintering and microstructural properties of cordierite produced from natural zeolite

Cited by 41 publications

References 31 publications

Zeolite usage as source of silica to produce cordierite in MgO–Al2O3–SiO2 system

Zeolite usage as source of silica to produce cordierite in MgO–Al2O3–SiO2 system

Effect of mechanical activation on CAS ceramics from produced using zeolite and marble powder

Effect of mechanical activation on catalytic properties of Fe₂O₃-pillared bentonite for Fenton-like reaction

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The effects of mechanical activation on the sintering and microstructural properties of cordierite produced from natural zeolite

Cited by 41 publications

References 31 publications

Zeolite usage as source of silica to produce cordierite in MgO–Al2O3–SiO2 system

Zeolite usage as source of silica to produce cordierite in MgO–Al2O3–SiO2 system

Effect of mechanical activation on CAS ceramics from produced using zeolite and marble powder

Effect of mechanical activation on catalytic properties of Fe2O3-pillared bentonite for Fenton-like reaction

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Effect of mechanical activation on catalytic properties of Fe₂O₃-pillared bentonite for Fenton-like reaction