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Autori: M. Mihai, D. Turtoi, R. Isopescu, C. Mateescu, I. Chilibon
Editorial: Chemisty Magazine, 60, nr. 6, p.626-631, 2009.
Precipitated calcium carbonate as vaterite and small amounts of calcite, with submicron sizes was obtained by a two stages reaction. In the first stage, the limestone was transformed with carbon dioxide in calcium bicarbonate in the absence and the presence of an ultrasonic applied field (35kHz and 0.52 W/cm2). The
ultrasonic intensity and specific power, the device immersion depth in column suspension and the cavitation
was observed to accelerate the dissolving rate of calcium carbonate. In the second stage, the solution of
calcium bicarbonate was aerated to obtain calcium carbonate. The experiment was conducted in the absence
and the presence of an ultrasonic applied field. The precipitation rate and the calcium carbonate particles size distribution were found to be influenced by the ultrasonic field. The morphology of the crystals formed
was unaffected by the ultrasonic field.
Cuvinte cheie: carbonat de calciu, camp ultrasonic, vaterit, piatra de var // calcium carbonate, ultrasonic field, vaterite, limestone