The thermochemical activity of dolomite occurred in dolomite–palygorskite

Xie, Jingjing; Chen, Tianhu; Xing, Bobo; Liu, Haibo; Xie, Qiaoqin; Li, Hongwei; Wu, Yucheng

doi:10.1016/j.clay.2015.07.014

Cited by 38 publications

(10 citation statements)

References 26 publications

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“…Gehlenite was the only phase neoformed in all studied PS-SC samples, and its proportion increased at the expense of both quartz and fluorapatite. were attributed respectively to hygroscopic water loss [45], pore additive (sawdust) dehydration, dolomite first stage decomposition, and calcite decomposition [46,47]. The addition of the sawdust shifted these peaks to a higher temperature.…”

Section: Phosphate Sludge-sawdust Blend (Ps-sc)mentioning

confidence: 99%

Phosphate Mine Tailing Recycling in Membrane Filter Manufacturing: Microstructure and Filtration Suitability

Loutou¹,

Misrar

Koudad

et al. 2019

Minerals

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Ceramic membrane filters based on industrial by-products can be considered to be a valorization alternative of phosphate mine tailings, even more so if these ceramic membranes are used in the industrial wastewater treatment due to their good mechanical, chemical, and thermal resistance. The depollution of textile industry rejections with this method has not been studied in detail previously. In this work, ceramic membrane filters have been manufactured from natural clay and phosphate mine tailings (phosphate sludge). Blends of the abovementioned materials with a pore-forming agent (sawdust, up to 20 wt. %) were investigated in the range 900–1100 °C using thermal analysis, X-ray diffraction, scanning electron microscopy, and mercury porosimetry. Ceramic properties were measured as a function of firing temperature and sawdust addition. Filtration tests were carried out on samples with advantageous properties. The results showed that gehlenite together with diopside neoformed from lime decomposed carbonates and breakdown products of clay minerals, while calcium phosphate derived from partial decomposition of fluorapatite. Both quartz and fluorapatite resisted heating. The results of the experimental design showed that the variations of physical properties versus processing factors were well described by the polynomial model. Filtration results are quite interesting, allowing these membranes to be used in industrial effluent treatment.

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Section: Phosphate Sludge-sawdust Blend (Ps-sc)mentioning

confidence: 99%

Phosphate Mine Tailing Recycling in Membrane Filter Manufacturing: Microstructure and Filtration Suitability

Loutou¹,

Misrar

Koudad

et al. 2019

Minerals

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“…The formation of belite during the calcination of a mixture of palygorskite and dolomite has already been observed (Xie et al, 2016). belite represents on average 15 to 20% of the total cement phases and is responsible of the long-term mechanical properties (Bouzidi et al, 2014).…”

mentioning

confidence: 90%

“…It is attributed to belite, a dicalcium silicate common in anhydrous cement. The formation of belite can be explained by a recombination phenomenon between the silicon from clayey phases and the calcium from dolomite (Xie et al, 2016). However, the low crystallinity of this new phase does not allow us to determine the type of polymorph.…”

mentioning

confidence: 99%

Potential for calcination of a palygorskite-bearing argillaceous carbonate

Poussardin

Paris

Tagnit-Hamou

et al. 2020

Applied Clay Science

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“…Penelitian dekomposisi pada dolomit palygorskite-China (DPC), suhu dekomposisi dolomit ditemukan 50°C lebih rendah dari dolomit umum. Dekomposisi dolomit mulai terjadi pada suhu 500 o C dan berakhir pada 780 o C dengan puncak maksimum terdapat pada suhu 745 o C [13]. Proses dekomposisi magnesium karbonat terjadi pada suhu lebih rendah dari pada proses dekomposisi kalsium karbonat [14].…”

Section: Pendahuluanunclassified

Pengaruh Suhu Kalsinasi Pada Proses Dekomposisi Dolomit

Royani¹,

Sulistiyono²,

Sufiandi³

2018

jsmi

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Proses dekomposisi dolomit menjadi MgO dan CaO merupakan proses penting mengingat kedua oksida tersebut banyak digunakan dalam berbagai aplikasi. Untuk melihat pengaruh suhu proses kalsinasi terhadap dekomposisi dolomit menjadi MgO dan CaO, maka dilakukan kalsinasi. Proses kalsinasi menggunakan tungku Muffle furnace dengan suhu sebesar 500 o C, 600 o C, 700 o C, 800 dan 900 o C. Sebanyak kurang lebih 100 gram/sampel dolomit dimasukkan dalam tungku dan dipanaskan dengan laju pemanasan 10 o C/menit pada berbagai suhu yang kemudian ditahan masing-masing selama 1 jam, 2 jam, 3 jam, 4 dan 5 jam. Produk kalsinasi kemudian ditimbang dan dikarakterisasi dengan X-Ray Diffraction (XRD) dan Scanning Electron Microscope (SEM). Hasil percobaan menunjukkan kalsinasi dolomit semakin meningkat seiring dengan kenaikkan suhu kalsinasi. Proses kalsinasi dolomit optimum tercapai pada suhu 900 o C selama 4 jam dengan pengurang berat mencapai 46,74 %. Berdasarkan perhitungan stoikiometri pengurangan berat 46,74 % menunjukkan bahwa 97,78 % dolomit terdekomposisi menjadi MgO dan CaO. Pembentukan fasa MgO dan CaO dari dolomit melalui dua tahapan yaitu tahapan pembentukan fasa MgO-CaCO 3 pada suhu 700 o C dan tahapan pembentukan CaO pada suhu 800 o C-900 o C. Kesimpulan yang didapatkan dari proses kalsinasi dolomit ini adalah peningkatan suhu kalsinasi dapat meningkatkan proses dekomposisi dolomit menjadi fasa MgO dan CaO.

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The thermochemical activity of dolomite occurred in dolomite–palygorskite

Cited by 38 publications

References 26 publications

Phosphate Mine Tailing Recycling in Membrane Filter Manufacturing: Microstructure and Filtration Suitability

Phosphate Mine Tailing Recycling in Membrane Filter Manufacturing: Microstructure and Filtration Suitability

Potential for calcination of a palygorskite-bearing argillaceous carbonate

Pengaruh Suhu Kalsinasi Pada Proses Dekomposisi Dolomit

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