Abstract
The adsorption of polymeric ferric species from hydrolysed Fe (III) solutions on Naillite at pH 2.5 has been examined. The bulk of the adsorption appears to be due to polycationic species of high molecular weight (> 10,000). Electrophoretic and cation exchange data indicated that the net charge on the clay surface became strongly positive at low pH values as a result of adsorption of the polycations. The adsorbed material was apparently amorphous to x-rays and did not affect the BET nitrogen surface area of the clay. Significant increases in the resistance of the dried clay to redispersion were observed, however, even at quite low Fe contents (< 1% by weight). These have been attributed to cementation effects.
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