In this work from kaolin processing industries from Ipixuna-PA were used in order to
synthesi analcime derived zeolite as predominant crystalline phase though the hydrothermal
process. The sample was converted into metakaolinite by calcinations at 700°C during 4
hours. From sample this metakaolinite a reacting mixture consisting of diatomite and sodium
hydroxide was prepared. In order to determine of ideal conditions for analcime synthesis, a
number of process variables were measured such as sodium availability, silicon ratio, nature
of the silica source, pH of the reacting mixture, and auto clave residence time. Some
important properties of the adsorbent where measured as well, such as thermal stability in the
presence of acids hydrogen desorption kinetics, the trends of the adsorption isotherms as such
as selectivity for copper, cadmium, zinc and nickel ions. Analcime synthesis from kaolin
processing wastes was feasible. A displacement in the (h, k, l) planes was observed at 400 °C
and was maintained up to 600°C, caused by the withdrawal of oxygen in positions 1/8 in
analcime, shrinking the unit cell and in active channels and sites of zeolite, affecting its
adsorption capacity.
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