Process for the production of a basic carbonate of aluminum and an alkali or alkali earth metal
AssigneeSwiss Aluminium Ltd.
InventorChanakya Misra
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Abstract
The process of the present invention resides in the production of an extremely pure basic aluminum-sodium carbonate of the dawsonite type. In the process of the present invention, aluminum hydroxide is reacted with an aqueous sodium bi-carbonate solution at a temperature between 160.degree. and 240.degree. C. and at a pressure of 5-50 atm. The reagents from an aqueous suspension which is stirred throughout the duration of the reaction and the temperature of the reaction is chosen in accordance with the length of crystalline fiber which is to be produced.
Claims7
A process for the production of a basic pure aluminum-sodium carbonate of the dawsonite type by reacting aluminum tri-hydroxide obtained from the Bayer process with an aqueous sodium bi-carbonate solution wherein the conversion to dawsonite is in the order of 98.5 to 99.5% comprising carrying out the reaction at a temperature between 160.degree. and 240.degree. C. and under a pressure of between 5 and 50 atm. in an aqueous suspension which is agitated by stirring whereby the length of the crystalline fibers increase with a corresponding increase in the reaction temperature.
Dependencies are inferred from the claim text.