Variation of pH during the Carbonation of CaCl2 and its Effect on the Concentration of CO32– and the Ratio of [Ca2+] to [CO32–]
The variation of pH value during the carbonation of CaCl2 solution was measured by pH meter and its effect on the dissolution of CO2 and the concentration of CO32– in the present work. Ca2+ is consumed gradually during the carbonation process, so the effect of pH value on the concentration ratio of Ca2+ to CO32– was also discussed in this paper. pH value decreases increasingly slowly as the reaction progresses. The addition of ammonia can not only improve the dissolution of CO2, but also enhance the concentration of CO32–. The concentration ratio of Ca2+ to CO32– decreases with reaction time because of no supplement in Ca2+ during the carbonation process.
Z.S. Liu, L.P. Xu, X.D. Liang, Z.H. Wang and H.M. Zhang
Y. Wang et al., "Variation of pH during the Carbonation of CaCl2 and its Effect on the Concentration of CO32– and the Ratio of [Ca2+] to [CO32–]", Advanced Materials Research, Vol. 1015, pp. 635-638, 2014