Features of irreversible sorption of heavy metal cations with granulated sorbents based on silicates and calcium aluminosiliicates

The composition and method for producing granulated sorbent for heavy metals on the basis of spontaneously refining slag (γ-2CaO∙SiO2) and modified hydroaluminosilicate as a binder have been developed. The nature of the sorption interaction of calcium silicates and aluminosilicates with aqueous solutions of the cations Fe3+, Се3+, Сu2+ Ni2+ have been studied. It has been shown that the presence of cations with different valence (Na+, K+) in addition to Ca2+ in the sorbent activates the defect formation and mass transfer at the exchange interaction. The irreversibility of the sorption interaction is provided by introduction of Се3+, Сu2+, Ni2+, Fe3+ into the lattice of calcium silicates and aluminosilicates, preserving the original framework of the granulated sorbent.