Enthalpy of Formation of Synthetic Cancrinite (Na7.68(Al6Si6O24)(NO3)1.68(H2O)4.1)

摘要

Cancrinite is one constituent of 'red muds,' a high-volume waste product of alumina production by the Bayer process. The Bureau of Mines determined the thermochemical properties of cancrinite as part of a program to provide such data for minerals of industrial importance. Cancrinite was synthesized by reacting aluminum silicate gel with a solution of NaOH and NaNO3, and the composition was determined by chemical analysis, differential scanning calorimetry, and thermogravimetric analysis. The heat of solution was determined by hydro-fluoric acid solution calorimetry. The standard enthalpy of formation at 298.15 K, was determined.