Variation of pH during the Carbonation of CaCl₂ and its Effect on the Concentration of CO₃^2– and the Ratio of [Ca²⁺] to [CO₃^2–]

Abstract:

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 CO₃^2– 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 CO₃^2– 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 CO₃^2–. The concentration ratio of Ca²⁺ to CO₃^2– decreases with reaction time because of no supplement in Ca²⁺ during the carbonation process.

• Periodical: Advanced Materials Research (Volume 1015)
• Pages: 635-638
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.1015.635
• Online since: August 2014
• Authors: Yun Wang, Shi Peng Zhu, Xin Peng Gan, Ying Zhang, Jiu Xin Jiang*
• Keywords: Ca²⁺/CO₃^2– Concentration Ratio, Carbonation, CO₃^2– Concentration, pH Value

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