Topic
Calcium oxide
About: Calcium oxide is a research topic. Over the lifetime, 7600 publications have been published within this topic receiving 66104 citations. The topic is also known as: caustic lime & quicklime.
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TL;DR: In this article, phase composition, nanostructural and morphological characteristics were determined using XRD, XRF, SEM and 29Si NMR for a C-S-H series with calcium-silicon ratio 0.6-3.0.
Abstract: A C–S–H series with calcium–silicon ratio 0.6–3.0 was synthesized by pozzolanic reaction. Phase composition, nanostructural and morphological characteristics were determined using XRD, XRF, SEM and 29Si NMR. Most of the samples were phase-pure, poorly crystalline C–S–H. Significant changes in the nanostructure of the C–S–H samples were observed when the calcium–silicon ratio reached values of 0.8, 1.0 and 1.5. At calcium–silicon ratio 0.8 the basal XRD peak began to develop, crosslinking between layers was seen below this ratio but not above, and there was a substantial decrease in mean silica chain length at this ratio. At calcium–silicon ratio 1.0 there was a pronounced microstructural change from granular to reticular and another substantial decrease in mean chain length (indicated by an abrupt increase in the Q1 peak intensity and decrease in the Q2 peak intensity). At calcium–silicon ratio 1.5 the basal XRD peak began to diminish again, the mean silica chain length decreased further, and isolated tetrahedra (Q0) were observed.
68 citations
TL;DR: The mechanism of hydration of calcium oxide to form calcium hydroxide has not been satisfactorily established, despite extensive investigation by many workers as mentioned in this paper utilizing techniques of X-ray diffraction, sorption, radioactive tracers and electron microscopy.
Abstract: THE mechanism of hydration of calcium oxide to form calcium hydroxide has not been satisfactorily established, despite extensive investigation by many workers1–6 utilizing techniques of X-ray diffraction, sorption, radioactive tracers and electron microscopy.
68 citations
TL;DR: In this paper, solid base catalysis of calcium oxide for transesterification of soybean oil with refluxing methanol was investigated, and the collected catalyst consisted of calcium glyceroxide, Ca[O(OH) 2 C 3 H 5 ] 2.
68 citations
TL;DR: Dry mechanosynthesis appears preferable to wet milling in the preparation of calcium phosphates of biological interest because porcelain induced hydroxyapatite decomposition with the formation of beta-trical calcium phosphate and silicon-stabilized tricalcium phosphate.
68 citations
TL;DR: In this paper, an absorbent prepared by use of CaO in place of Ca(OH)2, gypsum (CaSO4) and coal fly ash, exhibited a higher activity for dry-type flue gas desulfurization.
Abstract: As compared to a commercial absorbent prepared from Ca(OH)2, gypsum (CaSO4) and coal fly ash, an absorbent prepared by use of CaO in place of Ca(OH)2, exhibited a higher activity for dry-type flue gas desulfurization . The order of the addition of the raw materials in the slaking procedure has much effect on the activity of the resulting absorbent. The activity of the absorbent increased further upon hydrothermal treatment following the kneading procedure. The period of hydrothermal treatment was reduced to 3 h to attain the activity which exceeds 20% of the activity of the commercial absorbent which requires an optimum hydrothermal treatment period of 10 h. The activity enhancement by use of CaO is considered to result from exothermic heat of slaking CaO. At a high temperature, the reaction of CaO with a SiO2 component included in the coal fly ash facilitates the formation of calcium silicate. The formation of calcium silicate was suppressed by the existence of CaSO4 in the slaking procedure.
67 citations