The above dry mix was hydrated with 70 ml of a 0.083N sodium citrate solution (pH 9.01, M.W. 294.10) and mixed to a uniform plastic mass. The mix was then treated as detailed for Examples 19-31. The recorded and averaged temperature profile of the heating structure is shown in FIG. ...
·Al2O3, Na2CO3, NaHCO3, NaAl(OH)4, NaAlO2, Na2SO4 and KOH(H2O)4, which can be directly dissolved and leached, while the bound alkali is composed mainly of calcite (CaCO3), sodalite (Na6Al6Si6O24·2Na2X), hydrated garnet (Ca3Al2(SiO4)x(OH)12−4x) and tricalcium aluminate ...