Abstract
Calcium carbonate is one of the most sparingly soluble salts among those forming the scale. As its solubility is dependent on CO2 and then pH, natural water exploitation equipment such as process, drinking or irrigation systems are often faced with a serious scaling problem. Having as an objective to control the scale formation, this present work aims at studying the CaCO3 precipitation threshold using the classic fast controlled precipitation method. Studied solutions to be used are calco-carbonic waters ([Ca(HCO3)(2)]=0.4gL(-1)). Obvious results show that CaCO3 precipitation threshold occurs at higher nucleation time and lower supersaturation coefficient with lower temperature, stirring speed and dissolved CO2 degasification rate. The probability of CaCO3 heterogeneous precipitation has increased with low stirring speed, low dissolved CO2 degasification rate and low temperature.