Process for the preparation of an additive-containing anionic clay
comprising the steps of (a) preparing a physical mixture of a divalent
and a trivalent metal compound, (b) calcining the physical mixture at a
temperature in the range 200-800.degree. C. without performing a prior
aging or shaping step, thereby forming a product containing at least 5 wt
% of a rehydratable compound, and (c) rehydrating the calcined mixture in
aqueous suspension containing an additive to form the additive-containing
anionic clay.This process provides a simple and cost-effective way of
preparing additive-containing anionic clays. The process does neither
require aging or reaction steps before calcination, nor does it require
precipitation of metal salts or the handling of inhomogeneous slurries.