Basic magnesium aluminum hydroxycarbonate
AssigneeGiulini Chemie GmbH
InventorsKlaus Schanz, Albert Schwind, Hartmut Grund, Peter Klehr
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Abstract
Crystalline, basic magnesium aluminum hydroxycarbonate of the formula Al.sub.2 Mg.sub.6 (OH).sub.12 (CO.sub.3).sub.3.xH.sub.2 O where x is at least 4. A process for producing it comprises the conversion of aluminum hydroxide with basic magnesium carbonate and at least one compound selected from magnesium hydroxide and magnesium oxide. Stoichiometric quantities are employed with reference to the aluminum and the magnesium. The conversion takes place at temperatures from 50.degree. to 100.degree. C., and the resulting product is subsequently spray dried.
Claims7
Crystalline, basic aluminum magnesium carbonate of the formula
- Al.sub.2 Mg.sub.6 (OH).sub.12 (CO.sub.3).sub.3.xH.sub.2 O
- where x is at least 4.
Process for producing a basic aluminum magnesium carbonate of the formula
- Al.sub.2 Mg.sub.6 (OH).sub.12 (CO.sub.3).sub.3.xH.sub.2 O
- where x is at least 4
- comprising:
- mixing together in an aqueous suspension active aluminum hydroxide, basic magnesium carbonate and at least one compound selected from magnesium hydroxide and active magnesium oxide, in stoichiometric quantities with respect to the aluminum and the magnesium, wherein the magnesium oxide provided by the basic magnesium carbonate is between 44 and 70 weight percent of the total magnesium oxide, converting the active aluminum hydroxide, basic magnesium carbonate and the compound or compounds selected from magnesium hydroxide and active magnesium oxide to the basic aluminum magnesium carbonate at temperatures from 50.degree. to 100.degree. C. under the influence of shearing forces, and directly recovering the resulting product having the formula Al.sub.2 Mg.sub.6 (OH).sub.12 (CO.sub.3).sub.3.xH.sub.2 O from the suspension by spray drying.
Dependencies are inferred from the claim text.