Phase Transition/Nano Aggregation Growth Process of Zeolite 4A Prepared by Hydrothermal Synthesis and Its Mechanism

Zeolite 4A was prepared successfully by hydrothermal synthesis, using cheap Si-Al slag as raw materials. Formation mechanism of 4A zeolite and crystal growth process were studied by some characterized measurements, such as XRD, SEM etc, based on crystallized productions at different reaction time. The results indicate that (1) the reaction mechanism of the process is precursors state phase→SiO32-or AlO2- liqulid phase→zeolite P crystallization phase→phase transition from zeolite P to zeolite 4A→reversible phase transition from zeolite 4A to zeolite P; (2) zeolite 4A growth is the results of nano aggregation growth.