Study of the dehydroxylation of kaolinite and alunite from a Mexican clay with DRIFTS-MS

Osornio-Rubio, N.R.; Torres-Ochoa, J.A.; Palma-Tirado, M.L.; Jiménez‐Islas, H.; Rosas-Cedillo, R.; Fierro-Gonzalez, Juan C.; Martínez-González, G. M.

doi:10.1180/claymin.2016.051.1.05

Cited by 13 publications

(11 citation statements)

References 66 publications

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“…Heating of kaolin results in partial decomposition and structure rearrangement due to the removal of water in the crystal lattice of kaolinite (at 500–800°C dehydroxylation) (Bolewski & Żabiński, 1979; Osornio-Rubio et al , 2016). These reactions may be theoretically denoted as shown in reaction 1:…”

Section: Resultsmentioning

confidence: 99%

The effect of calcination temperature on metakaolin structure for the synthesis of zeolites

Król

Rożek

2018

Clay miner.

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The aim of this research was to determine the temperature of kaolin calcination in order to obtain an intermediate product (metakaolin) for the synthesis of geopolymers with potential application as self-supporting zeolitic membranes. The products obtained were analysed with X-ray diffraction (XRD), Fourier-transform infrared (FTIR) spectroscopy and scanning electron microscopy (SEM). The structural analysis of the metakaolins obtained suggested that the optimal temperature for the proposed application is 700°C. After alkali activation of metakaolin, it is possible to obtain zeolite A and hydroxysodalite. The factors analysed, determining the type and quantity of crystalline phases, were activation temperature and concentration of sodium hydroxide solution (activator). The largest amounts of zeolites were obtained by alkali activation with 9 mol/dm3 NaOH solution at 70°C.

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Section: Resultsmentioning

confidence: 99%

The effect of calcination temperature on metakaolin structure for the synthesis of zeolites

Król

Rożek

2018

Clay miner.

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“…Puncak serapan dari gugus Al-OH (6 coordinated Al-OH stretching vibration) pada metakaolin ditunjukkan oleh bilangan gelombang 914 cm -1 , inner hydroxyl atau OH pada bilangan gelombang 3612 -3623 cm -1 , dan outer hydroxyl atau OH pada bilangan gelombang 3677 -3707 cm -1 yang merupakan karakteristik dari kaolin tidak tampak. Hasil ini menunjukkan bahwa kaolin telah berubah menjadi metakaolin (Ilic et al, 2010;Osornio-Rubio et al, 2016).…”

Section: Analisis Xrdunclassified

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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“…After the samplings, the filters were thermally stabilized and sent to the laboratory for gravimetric and EC and OC composition analysis using thermal-optical transmittance (TOT) and reflectance (TOR) analysis (Chow et al, 2004) using the IMPROVE_A protocol (Chow et al, 2007). Although the EC measured by the thermal-optical methods is not technically considered as BC (Petzold et al, 2013), in this paper we refer to EC by TOR as a surrogate of BC as the light-absorbing carbon in the measured PM. Since the collection filters were heavily loaded and had homogenous deposits, analyses of anions (chlorides, nitrates, sulfates) and cations (ammonium and water-soluble sodium and potassium) by ion chromatography were performed.…”

Section: Sampling Techniquesmentioning

confidence: 99%

Black carbon, organic carbon, and co-pollutant emissions and energy efficiency from artisanal brick production in Mexico

Zavala

Molina

Maiz³

et al. 2018

Atmos. Chem. Phys.

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Abstract. In many parts of the developing world and economies in transition, small-scale traditional brick kilns are a notorious source of urban air pollution. Many are both energy inefficient and burn highly polluting fuels that emit significant levels of black carbon (BC), organic carbon (OC) and other atmospheric pollutants into local communities, resulting in severe health and environmental impacts. However, only a very limited number of studies are available on the emission characteristics of brick kilns; thus, there is a need to characterize their gaseous and particulate matter (PM) emission factors to better assess their overall contribution to emissions inventories and to quantify their ecological, human health, and climate impacts. In this study, the fuel-, energy-, and brick-based emissions factors and time-based emission ratios of BC, OC, inorganic PM components, CO, SO2, CH4, NOx, and selected volatile organic compounds (VOCs) from three artisanal brick kilns with different designs in Mexico were quantified using the tracer ratio sampling technique. Simultaneous measurements of PM components, CO, and CO2 were also obtained using a sampling probe technique. Additional measurements included the internal temperature of the brick kilns, mechanical resistance of bricks produced, and characteristics of fuels employed. Average fuel-based BC emission factors ranged from 0.15 to 0.58 g (kg fuel)−1, whereas BC∕OC mass ratios ranged from 0.9 to 5.2, depending on the kiln type. The results show that both techniques capture similar temporal profiles of the brick kiln emissions and produce comparable emission factors. A more integrated inter-comparison of the brick kilns' performances was obtained by simultaneously assessing emissions factors, energy efficiency, fuel consumption, and the quality of the bricks produced.

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Study of the dehydroxylation of kaolinite and alunite from a Mexican clay with DRIFTS-MS

Cited by 13 publications

References 66 publications

The effect of calcination temperature on metakaolin structure for the synthesis of zeolites

The effect of calcination temperature on metakaolin structure for the synthesis of zeolites

Kajian Dehidroksilasi Termal Kaolin menjadi Metakaolin menggunakan Analisis Termogravimetri

Black carbon, organic carbon, and co-pollutant emissions and energy efficiency from artisanal brick production in Mexico

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