Thermal decomposition kinetics of Algerian Tamazarte kaolinite by thermogravimetric analysis

Redaoui, D.; Sahnoune, F.; Heraiz, M.; Belhouchet, H.; Fatmi, M.

doi:10.1016/s1003-6326(17)60208-5

Cited by 14 publications

(9 citation statements)

References 30 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The As temperature increased from 100 C to 300 C, the area of inner-surface O-H groups (peak I) and that of inner-surface O-D groups (peak I 0 ) signicantly decreased, while the areas of peaks III and III 0 and peaks IV and IV 0 remained almost unchanged considering tting errors, whereas the peak II area slightly increased and the peak II 0 area at 200 C and 300 C became signicantly higher than that at 100 C. The area decrease of peaks I and I 0 and area increase of peaks II and II 0 indicated that peak I shied to peak II, and peak I 0 correspondingly changed into peak II 0 . Kristóf and Redaoui 41,42 reported that proton delocalization and predehydroxylation of kaolinite could occur between the temperatures of 30 C to 360 C. The results of Fig. 3 also proved that the kaolinite skeleton structure could be slightly affected as heating temperature increased from 30 C to 300 C, based on the changes of peak intensity at 757 cm À1 (Si-O-Al) and 670 cm À1 (Al-O).…”

Section: Physical and Chemical Properties Of Kaolinitementioning

confidence: 68%

In situ study on interactions between hydroxyl groups in kaolinite and re-adsorption water

et al. 2020

View full text Add to dashboard Cite

show abstract

Section: Physical and Chemical Properties Of Kaolinitementioning

confidence: 68%

In situ study on interactions between hydroxyl groups in kaolinite and re-adsorption water

et al. 2020

View full text Add to dashboard Cite

show abstract

“…Based on the chemical compositions of the coal gangue and high alumina refractory solid wastes (Table 1), the main components are kaolinite, quartz, and alumina. When the samples were calcined, mullite was formed through the following reactions [18][19][20][21] :…”

Section: Phase and Microstructure Of The Mullite Powdermentioning

confidence: 99%

Synthesis and mechanical properties of mullite ceramics with coal gangue and wastes refractory as raw materials

Liu

Lian

et al. 2019

Int J Applied Ceramic Tech

View full text Add to dashboard Cite

With coal gangue and high alumina refractory solid wastes as raw materials, needle-like mullite powder, with an average diameter of about 1 μm, was synthesized at 1300°C by using the conventional solid-state reaction method. Mullite ceramics were derived from the inexpensive needle-like powder. Phase composition was examined by using X-ray diffraction (XRD), while morphologies of the ceramics were observed by using scanning electron microscopy. The content and distribution of elements in the sintered samples were characterized with energy dispersive spectrometer and X-ray fluorescence spectroscopy. Mechanical properties of the mullite ceramics were studied by using the three-point bending method. The aspect ratio of the needle-like mullite particles was up to 6. The mullite sample sintered at 1500°C for 3 hours had a density of 2.515 g•cm −3 , which was slightly lower than the theoretical density. Maximum fracture toughness and bending strength of the mullite ceramics were 1.82 MPa•m 1/2 and 71.76 MPa, respectively. This study realizes the resource utilization of gangue and high alumina refractory solid wastes, and the prepared mullite ceramics have good application prospect.

show abstract

“…The expansion observed during stage D, between 840 and 983°C is due the structural reorganization of métakaolinite regarding the formation of a primary mullite phase or of a Al‐Si spinel phase 33 . The stage E, between 1000°C and 1200°C can be attributed to the occurrence of mullite (crystallization) and to the crystallization of cristobalite 34,35 . The curves of Figure 1 indicated that the presence of MgCO 3 tended to enhance the sintering shrinkages (‐ 0.5% for specimen with 12 mass% of magnesite sintered at 1200°C), this result appeared in agreement with results obtained from previous studies 36,37 .…”

Section: Resultsmentioning

confidence: 95%

Sintering and final properties of kaolinite‐magnesite tapes for the manufacture of cordierite‐mullite ceramics

Hammas

Lecomte‐Nana

Daou

et al. 2020

Int J Applied Ceramic Tech

View full text Add to dashboard Cite

The present work aims at studying the effect of the sintering temperature and magnesite addition on the structure and final properties of silicate ceramics tapes. A kaolinitic clay from Algeria was selected and mixed with different magnesite contents (≤12 mass%). Tape casting process was used to produce the green tapes in an aqueous system with optimized amount of surfactants. The green tapes were fired from 1000°C to 1200°C using a dwelling time of 30 minutes. The effect of the dwelling time was investigated for a firing temperature of 1200°C namely: 30 minutes, 1 hour 30 minutes and 3 hours for samples with 6 and 12 mass% of magnesite. Regarding firing conditions, crystalline phases, thermal conductivity, porosity, and flexural strength were analyzed. The results showed that increasing the sintering temperature to 1200°C tended to significantly decrease the total porosity of samples, which led to the improvement of the stress to rupture values. Specimens with 6 and 12 mass% sintered during 3 hours exhibited highest stress to rupture values (≈117 MPa) and lowest thermal conductivity (<0.2 W.m−1.K−1) and moderate open porosity (27%). The as‐obtained ceramics appeared promising for further utilization in refractory industry, thanks to the presence of both cordierite and mullite phases.

show abstract

Thermal decomposition kinetics of Algerian Tamazarte kaolinite by thermogravimetric analysis

Cited by 14 publications

References 30 publications

In situ study on interactions between hydroxyl groups in kaolinite and re-adsorption water

In situ study on interactions between hydroxyl groups in kaolinite and re-adsorption water

Synthesis and mechanical properties of mullite ceramics with coal gangue and wastes refractory as raw materials

Sintering and final properties of kaolinite‐magnesite tapes for the manufacture of cordierite‐mullite ceramics

Contact Info

Product

Resources

About