Abstract
This paper reports a new method to produce calcite (CaCO 3) crystals with common and unconventional morphologies in the Ca(OH) 2–H 2O–CO 2 system, without the use of any tailor-made additive. Operating at temperatures ( T) of 20°C, 25°C and 30°C, the method used is based on the adjustment of the electrical conductivity ( κ 25) of that system at fixed values of 1, 3, 5 and 7 mS/cm. This variable was adjusted automatically by pumping a slaked lime suspension to a reactor containing deionized water, and provided with a constant flow rate of 20% CO 2/80% N 2 (v/v). The results, represented in a T− κ 25 space, show the production of calcite adopting different morphologies and sizes. Morphologies as diverse as rhombohedral, rhombo-scalenohedral and scalenohedral in the micrometric size range, as well as submicrometric chain-like particles and nanometric spherules are produced. The mechanism of formation of calcite with these morphologies is discussed.
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