Abstract
1. The process for the polymerization of metal aquo-ions in mixed aqueous solutions of Fe and Al salts can be subdivided into the following steps: formation of particles of iron hydroxide sol, formation of monomeric and dimeric polynuclear aluminum hydroxo complexes, and formation of particles of aluminum hydroxide sol. 2. The aluminum aquo-ions do not participate in forming the particles of the iron hydroxide sol. 3. The aluminum aqua and hydroxo complexes stabilize the particles of the iron sol and facilitate a retention of their composition and properties clear up to the deposition of a precipitate. 4. The particles of the iron and aluminum sols are formed independently during polymerization.
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