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US 2026/0209059 A1Published application
Calcination Apparatus and Process
AssigneeRio Tinto Alcan International Limited
InventorsMichaël Reid, Véronique Savard, Stephen Tysoe
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Abstract
A process for calcining aluminium trihydrate (Al2O3·3H2O) to form alumina (Al2O3) replaces at least a part of a natural gas energy source for generating heat for use in a calciner with an electrical energy source. The process may comprise using at least one electrically-heated fluidized bed reactor for calcining aluminium trihydrate.
Claims22
A process for calcining aluminium trihydrate (Al2O3·3H2O) to form alumina (Al2O3) comprising:
- (a) supplying aluminium trihydrate particles to an electrically heated 1st reactor and heating aluminium trihydrate particles to temperatures up to at least 280° C. and no greater than 400° C. and calcining at least a major part of the aluminium trihydrate to aluminum oxyhydroxide (γ-AlOOH or AlO(OH)) in the 1st reactor;
- and
- (b) supplying aluminum oxyhydroxide particles from the 1st reactor to a 2nd reactor and heating aluminum oxyhydroxide particles and calcining aluminum oxyhydroxide to alumina.
(canceled)
(canceled)
An apparatus for calcining aluminium hydroxide (Al2O3·3H2O) to form alumina (Al2O3), the apparatus comprising:
- (a) an electrically heated 1st reactor that is configured to heat aluminium trihydrate particles to temperatures up to at least 280° C. and no greater than 400° C. and calcining at least a major part of the aluminium trihydrate to aluminum oxyhydroxide (γ-AlOOH or AlO(OH)) in the 1st reactor;
- and
- (b) a 2nd reactor for heating and calcining aluminum oxyhydroxide particles from the 1st reactor to alumina.
Dependencies are inferred from the claim text.