The influence of thermal treatment on properties of kaolin

Erasmus, Elizabeth

doi:10.2298/hemind150720066e

Cited by 26 publications

(9 citation statements)

References 17 publications

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“…Two types of bentonite are known as sodium (sodic) bentonite and calcium (calcic) bentonite [6]. The sodium bentonite contains more Na + ion than Ca 2+ and Mg 2+ ions.…”

Section: Resultsmentioning

confidence: 99%

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Material characterization of pagerjurang clay as a raw material for pottery

Widjonarko

Wahyuningsih

Pramono

et al. 2022

J. Phys.: Conf. Ser.

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Various functional and decorative pottery articles are produced of Pagerjurang, Klaten. The articles are made of raw material which are processed, shaped, dried, and burned in traditional kilns. In this study, a raw material of Pagerjurang Clay was characterized using XRD (X-ray Diffractometer) and SEM/EDX (Scanning Electron Microscope-Energy Dispersive X-ray). The results showed that Pagerjurang Clay was contained bentonite (24,87 %), quartz (37.08 %), feldspar (9.46 %), and illite (28.57 %), that consist silica 46.51% (w/w) and alumina 17.34 % (w/w), respectively. Pagerjurang Clay is red-browns color; very fine size; easy to break while dry, but very tough and sticky while wet; and easily made into the desired shape and elastic (not easily to be broken)

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“…Two types of bentonite are known as sodium (sodic) bentonite and calcium (calcic) bentonite [6]. The sodium bentonite contains more Na + ion than Ca 2+ and Mg 2+ ions.…”

Section: Resultsmentioning

confidence: 99%

“…This is a structural but not chemical transformation. Thermal reaction and chemical transformation lead to permanent changes including increasing their strength and hardening and setting their shape [6] .…”

Section: Introductionmentioning

confidence: 99%

Material characterization of pagerjurang clay as a raw material for pottery

Widjonarko

Wahyuningsih

Pramono

et al. 2022

J. Phys.: Conf. Ser.

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“…Table 2. Assignment of the infrared bands [30][31][32] identified on the dirt layer on varnished mock-ups.…”

Section: Ftir Spectroscopymentioning

confidence: 99%

A Multi-Analytical Non-Invasive Approach to Aqueous Cleaning Systems in Treatments on Bowed String Musical Instruments

et al. 2021

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Restoration and conservation procedures for historical musical instruments involve several issues, also connected with their frequent being played. One of the most delicate procedures for their preservation is the cleaning of surfaces from soil and dirt which have accumulated over the years. In fact, when external particles reach the surface, a fraction of them can deposit on it. Moreover, the contact with the player can generate chemical-physical changes, rapidly warming and wetting the surfaces through sweat deposition. This work focused on the cleaning methods of surfaces of bowed string musical instruments by a systematic and analytical approach. The selective cleaning procedure of varnished surfaces from grime and soil needs to be performed without compromising the original matter. Therefore, a dirty surface was reproduced on a set of varnished mock-ups and different water-based cleaning systems—generally used by restorers—were tested. The procedures were monitored in each step with several analytical methods: multispectral imaging (near-infrared (NIR), IRFC, visible imaging (VIS), UV-induced visible fluorescence), stereomicroscopy, XRF and FTIR spectroscopies allowed us to non-invasively outline the cleaning system efficacy. The results highlighted different levels of cleaning and, in some cases, it was possible to identify the best selectivity for the different procedures.

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“…Persamaan regresi yang dihasilkan oleh model reaksi order 1 memiliki R 2 terbesar, yaitu 0,988. Dengan demikian proses dehidroksilasi kaolin menjadi metakaolin mengikuti model reaksi order 1 dimana kecepatan reaksi bergantung linier dengan konsentrasi reaktan (kaolin), sama seperti hasil yang diperoleh Erasmus (2016).…”

Section: Model Reaksi Dan Parameter Kinetika Dehidroksilasi Kaolinunclassified

Kajian Dehidroksilasi Termal Kaolin menjadi Metakaolin menggunakan Analisis Termogravimetri

Purbasari

Samadhi

2021

ALCHEMY J.Pen.Kim

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Kaolin merupakan mineral yang banyak dimanfaatkan di berbagai industri. Kaolin dapat diubah menjadi metakaolin yang lebih reaktif melalui proses dehidroksilasi termal. Pada penelitian ini, proses dehidroksilasi termal kaolin dari Bangka Belitung menjadi metakaolin dikaji menggunakan analisis termogravimetri pada rentang suhu 30 – 900 °C dengan laju pemanasan 10 °C/menit dalam lingkungan atmosfer udara. Kaolin mengalami empat tahap dekomposisi dan dehidroksilasi kaolin menjadi metakaolin terjadi pada suhu sekitar 450 – 600 °C. Berdasarkan metode Coats dan Redfern, dehidroksilasi kaolin mengikuti model reaksi order satu dengan energi aktivasi 271,66 kJ/mol dan faktor pre-eksponensial 6,13×1015 s-1. Hasil analisis menggunakan spektroskopi X-ray diffraction (XRD) dan Fourier Transform Infrared (FTIR) pada kaolin setelah dipanaskan pada suhu 550 °C selama 3 jam menunjukkan bahwa sebagian besar kaolin telah berubah menjadi metakaolin.Study of Thermal Dehydroxylation of Kaolin to Metakaolin using Thermogravimetric Analysis. Kaolin is a mineral that is widely used in various industries. Kaolin can be converted into metakaolin which is more reactive through thermal dehydroxylation processes. In this study, thermal dehydroxylation process of Bangka Belitung kaolin into metakaolin was studied using thermogravimetric analysis in a temperature range of 30 – 900 °C with a heating rate of 10 oC/min in an air atmosphere condition. Kaolin underwent four stages of decomposition and dehydroxylation of kaolin into metakaolin occured at temperatures around 450 – 600 °C. Based on the Coats and Redfern method, kaolin dehydroxylation followed first order reaction model with activation energy of 271.66 kJ/mol and pre-exponential factor of 6.13×1015 s-1. The analysis using X-ray diffraction (XRD) dan Fourier Transform Infrared (FTIR) spectroscopy on kaolin after heating at temperature of 550 °C for 3 hours showed that most of the kaolin had turned into metakaolin.

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The influence of thermal treatment on properties of kaolin

Cited by 26 publications

References 17 publications

Material characterization of pagerjurang clay as a raw material for pottery

Material characterization of pagerjurang clay as a raw material for pottery

A Multi-Analytical Non-Invasive Approach to Aqueous Cleaning Systems in Treatments on Bowed String Musical Instruments

Kajian Dehidroksilasi Termal Kaolin menjadi Metakaolin menggunakan Analisis Termogravimetri

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