density, and calcinations loss. Another important characteristic is
particle size distribution, given its influence on the kinetics of water
hardness removal by zeolites, with the zeolites in both processes
falling within the required range. Among the conformity parameters,
it is important to determine the chemical composition of
the oxides (Al2O3, SiO2, and Na2O), because the values obtained
by XRF can be used to confirm the chemical formula of zeolite
4A by calculating the mass and molar amounts of Si, Al, and Na
(Tables A.2 and A.3, Supplementary material). These results indicated
that waste used in moderate and integrated processes is
suited to the production of high quality zeolite as a builder for
detergents.