Utilisation of gyrolite with impure Cd2+ ions in cement stone

Abstract

This study examined the adsorption capacity of gyrolite for Cd2+ ions in acidic and alkaline solutions and the influence of this compound on the hydration of ordinary Portland cement (OPC). In addition, this paper presents the utilisation scheme of gyrolite with impure Cd2+ ions in the cement stone. It was determined that the Cd(NO3)2 solution substitution isomorphism is typical of gyrolite because ∼33% (in solution at a pH of 5·96) and ∼22% (in solution at a pH of 8·70) of Cd2+ ions participate in the substitution/chemical reaction (gyrolite-Ca0 + Cd2+≤ftrightarrow gyrolite-Cd0 + Ca2+), whereas the rest of these ions are present in gyrolite according to an additional interaction. It was estimated that the addition of adsorbents substituted with Cd2+ ions had no substantial effect on the mineralogical composition of OPC samples. It was also noted that Cd2+ ions were bound in the cement stone under all experimental conditions.