Process and system for thermal treatment of granular solids
AssigneeOutotec (Finland) Oy
InventorsMichael Ströder, Peter Sturm, Michael Missalla, Cornelis Klett
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Abstract
The invention relates to a process and the respective installation for thermal treatment of granular solids, in particular for producing aluminum oxide from aluminum hydroxide, wherein the solids are heated in at least one preheating stage and then reacted in a reactor at 700 to 1400° C. In at least one preheating stage, the average temperature gradient of the solids amounts to <15K/s and the dwell time of the solids amounts to ≥15 s.
Claims13
A process for thermal treatment of granular solids, in particular for production of aluminum oxide from aluminum hydroxide, in which the solids are heated in at least one preheating stage and then are reacted in a reactor at 700 to 1400° C., characterized in that, the average temperature gradient of the solids amounts to <15 K/s and the dwell time of the solids amounts to ≥15 s in at least one preheating stage.
The process according to any one of the preceding claims, characterized in that the solids are heated in countercurrent with the heating medium in at least two preheating stages connected after one another.
The process according to any one of the preceding claims, characterized in that at least one preheating stage is designed as a ring fluidized bed.
The process according to any one of the preceding claims, characterized in that the solids are first sent to a warming reactor in at least one preheating stage and then are sent to a residence time reactor.
Dependencies are inferred from the claim text.