Preparation and properties of calcium oxide from eggshells via calcination

• Autorzy: Tangboriboon N. , Kunanuruksapong R. , Sirivat A.
• Języki publikacji: EN

Abstrakty

EN

Duck eggs are one of the most versatile cooking ingredients in which residue eggshells are discarded. Raw duck eggshells were calcined at temperatures between 300 to 900 °C, for 1, 3, and 5 h. Both the raw and calcined duck eggshells were characterized by FTIR, STA, XRD, XRF, TEM, BET, a particle size analyzer, and an impedance analyzer. The proper calcination conditions are: 900 °C and 1 h, yielding calcium oxide with a purity of 99.06 % w/w. The calcium carbonate of the rhombohedral form (CaCO3) transforms completely into the calcium oxide or lime of the face centered cubic form (CaO) at 900 °C, as shown by XRD diffraction patterns. The transmission electron microscopy (TEM) images of the calcium oxide reveal a moderately good dispersion of nearly uniform particles. The calcium oxide has a white color, a spherical shape, high porosity, and narrow particles size distribution. The percentage of ceramic yield of the calcium oxide is 53.53, as measured by STA (TG-DTA-DTG). The calcium oxide has a N2 adsorption-desorption isotherm indicating the meso-porosity range. The dielectric constant and the electrical conductivity of the calcined calcium oxide are 35 and 1:0-106(W-m)1 , respectively, at the frequency of 500 Hz.

Słowa kluczowe

EN

calcium oxide; pyrolysis; specific surface area; phase transformation

• Wydawca: De Gruyter
• Czasopismo: Materials Science Poland
• Rocznik: 2012
• Tom: Vol. 30, No. 4
• Strony: 313--322
• Opis fizyczny: Bibliogr. 15 poz., rys.

Twórcy

autor

Tangboriboon N.

autor

Kunanuruksapong R.

autor

Sirivat A.

• Center for Advanced Studies in Industrial Technology and The Materials Engineering Department, Faculty of Engineering, Kasetsart University, Bangkok 10900, Thailand

Bibliografia

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