Utilization of oil shale ash to prepare PCC: leachibility dynamics and equilibrium in the ash-water system

摘要

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 leachibility 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 diffusioncoefficients determined. The effect of temperature on the Ca~(2+) equilibrium concentration was investigated. Data collected served as basis for modeling of the equilibrium and dynamics of leaching of Ca~(2+) ions.