Calcination apparatus and process using hydrogen
AssigneeRio Tinto Alcan International Limited
InventorTomas Mach
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Abstract
A process of calcining aluminium hydroxide (Al2O3.3H2O) to form alumina (Al2O3), for example in an alumina plant, such as a Bayer process plant, is disclosed. The process comprises combusting hydrogen and oxygen and generating steam and heat 5 and using the heat to calcine aluminium hydroxide and form alumina and more steam. An apparatus is also disclosed.
Claims28
A process of calcining aluminium hydroxide (Al2O3.3H2O) to form alumina (Al2O3), comprising:
- supplying hydrogen and oxygen to a reaction chamber and combusting the hydrogen and the oxygen and generating steam and heat;
- and
- using the heat to calcine the aluminium hydroxide and form the alumina and more steam.
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A process of calcining aluminium hydroxide (Al2O3.3H2O) to form alumina (Al2O3), the process comprising:
- combusting hydrogen and oxygen and generating steam and heat, using the heat to calcine aluminium hydroxide and form alumina and more steam, and using the steam generated from said combustion as a transport gas in the process.
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A process of starting up a plant for calcining aluminium hydroxide (Al2O3.3H2O) to form alumina (Al2O3) in an alumina refinery, the calcination plant comprising a reaction chamber in which oxygen is combusted with a fuel, the process comprising:
- a preheating step of heating the reaction chamber until predetermined steady state conditions are achieved and then commencing supplying aluminium hydroxide to the reaction chamber and calcining the aluminium hydroxide and forming the alumina.
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An apparatus for calcining aluminium hydroxide (Al2O3.3H2O) to form alumina (Al2O3), the apparatus comprising:
- a reaction chamber configured to calcine the aluminium hydroxide to form the alumina;
- a source of hydrogen and a source of oxygen for generating heat for calcining the aluminium hydroxide in the reaction chamber and generating the alumina and a flue gas including steam, an outlet for the alumina, and an outlet for the flue gas.
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Dependencies are inferred from the claim text.