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In current study the oil shale ash consisting free lime have been considered as a source of Ca in the precipitated calcium carbonate (PCC) production. In connection with this approach, a set of laboratory experiments was carried out in order to investigate the leach ibility dynamics and equilibrium of the main ions from oil shale ashes formed in boilers operating with different combustion technologies. The main characteristics of Ca distribution between phases have been established using different ash/water suspension ratios and diffusion coefficients determined. The effect of temperature on the Ca2+ equilibrium concentration was investigated. Data collected served as basis for modeling of the equilibrium and dynamics of leaching of Ca2+ ions.
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Velts et al. (2009) studied this question.
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