Dissolution characteristics of carbide slag, fly ash and limestone: Experiment and modelling

Carbide slag and fly ash are the by-product of chemical engineering. This paper reports the dissolution process of mixed absorbents of carbide slag, fly ash, and limestone as wet absorbents. The reaction activity of single component of carbide slag or fly ash is better than the limestone. When limestone is mixed with carbide slag, the dissolution rate of the mixture increases with the increasing of carbide slag content. The reaction rate of fly ash is the fastest, and doesn't obviously change when the fly ash is mixed with carbide slag. The fly ash can be used as an additive to improve the reaction property of desulfurizers. The shrinking core model incorporated into particle size distribution is introduced to study the dissolution process of solid particle groups. The dissolution processes of three desulfurizers are predicted. And the reaction characteristics of desulfurizers can be described by a parameter called the total chemical reaction rate constant. This correlation model has a significant value for improving the liquid-solid reaction theory system. And it is helpful to obtain the micro chemical reaction parameters from the macro experimental data.