Abstract
Abstract Refluxing montmorillonite-containing raw bentonite ((Na,Ca)0.33(Al,Mg)2Si4O10(OH)2) in aq HNO3, then neutralizing it with NH3 produces NH4NO3-containing NH4–bentonite. The NH4NO3 intercalated can be eliminated as a gaseous product (N2O and H2O) by heating at 400 °C, and the deammoniation and dehydroxylation process of the preactivated bentonite leads to formation of bleaching earth (Hx(Al,Mg)2−ySi4O10(OH)2).
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