Factors Affecting the Crystal Growth of Scalenohedral Calcite by a Carbonation Process

Thriveni, Thenepalli; Um, Namil; Nam, Seong-Young; Ahn, Young Jun; Han, Choon; Ahn, Ji Whan

doi:10.4191/kcers.2014.51.2.107

Cited by 15 publications

(9 citation statements)

References 9 publications

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“…The characteristic diffraction peaks (2θ) from sample without heating treatment were 23.20, 29.61, 39.61, 43.36, 47.70 and 48.70° which correspond to nucleation planes of calcite polymorph. This result is in line with earlier report which indicated that calcite polymorph could be formed at room temperature [13].…”

Section: Powder Xrd Analysissupporting

confidence: 94%

“…The calcite polymorph peaks were observed in 2θ of 23.07, 29.40, 39.41, 43.28, 47.63, and 48.5° (JCPDS 00-005-00586). This finding was in accordance to literature in which calcite could formed at 10 to 45 °C while vaterite could formed at 30 to 50 °C [12][13]16].…”

Section: Powder Xrd Analysissupporting

confidence: 93%

“…3 (top). The FT-IR spectra of all CO2 flow rates are identical to that of pure CaCO3 from the literature [13], with only small shift in some bands. Nevertheless, increasing of flow rate sharpen the bands around 1400 cm -1 and may indicates the formation of vaterite polymorph.…”

Section: The Effect Of Co2 Gas Flow Rate In the Carbonation Processsupporting

confidence: 70%

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Effect of CO<sub>2</sub> Flow Rate and Carbonation Temperature in the Synthesis of Crystalline Precipitated Calcium Carbonate (PCC) from Limestone

Wardhani¹,

Prasetia²,

Khunur³

et al. 2018

Indones. J. Chem.

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The effect of CO2 flow rate and carbonation temperature were studied in the synthesis of PCC from limestone using carbonation method. The synthesis was started by dissolving CaO that was obtained from calcination of limestone into HNO3 6M. The solution was then added with ammonia solution and then streamed with CO2 until pH 8 with flow rates of 0.5; 1.0; 1.5; and 2.0 L/min. The optimum flow rate obtained from this stage was then applied in the carbonation process with temperatures of 50, 80, 100, 150, 200, and 250 °C. The results showed that low flow rate give reasonably high yield but the yields obtained in every flow rate used in this work has insignificant difference based on F-test. The optimum flow rate used for the synthesis of PCC in the next stage was 0.5 L/min with a yield of 62.95%. Different carbonation temperature influences the polymorphs and crystallinity of the synthesized PCC. The synthesized PCC was analyzed by FT-IT, powder-XRD, SEM-EDX, and PSA. FT-IR analysis showed stretching vibrations of C–O at 1419, 1479, and 1384 cm-1 which correspond to calcite, vaterite, and aragonite respectively. Powder-XRD and SEM-EDX confirms that at the carbonation temperature of 50 °C, calcite and vaterite were formed, while at the carbonation temperature of 80 °C, mixture of calcite-vaterite-aragonite were obtained. Higher carbonation temperature changes the vaterite and aragonite polymorphs into calcite, and the best crystallinity was obtained at 250 °C. PSA analysis showed that the particle diameter of the synthesized PCC was about 3.58 to 38.14 µm.

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Section: Powder Xrd Analysissupporting

confidence: 94%

Section: Powder Xrd Analysissupporting

confidence: 93%

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Effect of CO<sub>2</sub> Flow Rate and Carbonation Temperature in the Synthesis of Crystalline Precipitated Calcium Carbonate (PCC) from Limestone

Wardhani¹,

Prasetia²,

Khunur³

et al. 2018

Indones. J. Chem.

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“…Synthesis of different morphologies of calcite PCC can be done by controlling process parameters such as temperature, gas flowrate and by introducing additives into the process. Modification of particle morphology can be attained by inducing different growth rate on crystal faces [15].…”

Section: Morphology Of Precipitated Calcium Carbonatementioning

confidence: 99%

Effect of Methane on the Synthesis of Precipitated Calcium Carbonate via Carbonation Process

Lahuri¹,

Berahim²,

Onn³

et al. 2019

IJET

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Precipitated calcium carbonate (PCC) is synthetic calcium carbonate that has high purity of more than 98 wt% of CaCO3 content. Owing to its unique characteristic whereby its shape and size can be controlled to tailor to various applications, PCC has seen great demands in many industries such as paper, paint, plastic, food, ceramics, cosmetics, pharmaceutical, and many others. PCC can be synthesized via various methods and the most often used method in industry is via carbonation process. This process has caught interest of the oil and gas industry for utilizing existing carbon dioxide waste from plant processes. Precipitation of PCC is carried out using hydrated lime under various conditions at different gas purity (1 mol% CH4 + 99 mol% CO2 , 40 mol% CH4 + 60 mol% CO2 ), different gas flowrate, and different stirring rate. All experiments are carried out using 1 litre of ionic solution at ambient conditions. All samples are characterized using Field Emission Scanning Electron Microscopy (FESEM), Particle Size Distribution, X-Ray Diffraction (XRD), and X-Ray Fluorescence (XRF). FESEM analysis shows different surface morphology for different methane content with calcite formation. The particle size for all PCC produced at different parameters are comparable at the range 5-9 microns depending on the mixing rate used whereas XRF results indicate very high purity of CaCO3 of more than 99 wt%.

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“…Sentetik (çöktürülmüş) kalsiyum karbonat üretiminin değişik yöntemleri olmasına rağmen en çok tercih edileni, saf kireçtaşlarının kalsinasyonu ile üretilendir [4][5][6][7][8]. Özellikle ABD'de uygulanan yönteme göre silisi düşük kireçtaşları yakılarak (kalsine edilerek) önce CaO elde edilir ve suyla karıştırılarak oluşan kireç sütünden bir reaktör içerisinde CO 2 gazı basınç altında (bazı kimyasallar eklenerek) sisteme verilerek tane büyüklüğü (1-3 µm boyutlarında) ve kristal şekli kontrol edilebilen suni ve saf kalsit kristalleri oluşturulması yoluna gidilmektedir.…”

Section: çöKtürülmüş Kalsi̇yum Karbonat üReti̇mi̇unclassified

Çöktürülmüş Kalsiyum Karbonat Üretimi

Kiliç¹

2015

Çukurova Üniversitesi Mühendislik-Mimarlık Fakültesi Dergisi

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ÖzetYapılan çalışmada, kalsiyum hidroksit çözeltisinden çöktürülmüş kalsiyum karbonat (ÇKK) üretimi incelenmiştir. Uygulanan sistem oldukça basit ve çevre dostu bir karbonizasyon prosesidir. Çalışmada Kalsiyum hidroksit çözeltisine karbondioksit püskürtülerek katkı maddesi kullanılmaksızın kalsiyum karbonat (CaCO 3 ) üretimi gerçekleştirilmiştir. Çöktürülmüş kalsiyum karbonat, birbirine yakın tane aralıklarında ve skalenohedral (triangular) kristal şekilli kalsit olarak üretilmiştir. Üretilen sentetik kalsitlerin bileşimi, kristal yapısı/mineralojisi, tane boyutu ve özgül yüzey alanı XRF, XRD, SEM ve mastersizer kullanılarak belirlenmiştir.Anahtar Kelimeler: Sentetik, Kireçtaşı, Kireç, ÇKK, Karbondioksit Production of Precipitated Calcium Carbonate AbstractIn this study, the production of precipitated calcium carbonate (PCC) from a suspension of calcium hydroxide was investigated. The applied system is a simple and eco-friendly carbonation process. Carbon dioxide is blown into a suspension of calcium hydroxide, and the resulting calcium carbonate (CaCO 3 ) is recovered without any additives. Precipitated calcium carbonate is produced as an uniform particle size and a scalenohedral crystalline shaped calcite. The synthesized calcite was analyzed by XRF, XRD, SEM and mastersizer to identify the content, phase, particle size and specific surface area.

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Factors Affecting the Crystal Growth of Scalenohedral Calcite by a Carbonation Process

Cited by 15 publications

References 9 publications

Effect of CO<sub>2</sub> Flow Rate and Carbonation Temperature in the Synthesis of Crystalline Precipitated Calcium Carbonate (PCC) from Limestone

Effect of CO<sub>2</sub> Flow Rate and Carbonation Temperature in the Synthesis of Crystalline Precipitated Calcium Carbonate (PCC) from Limestone

Effect of Methane on the Synthesis of Precipitated Calcium Carbonate via Carbonation Process

Çöktürülmüş Kalsiyum Karbonat Üretimi

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