Aluminum Pechiney

Philippe Marchessaux

Lothar Reh

Ludolf Plass

Hans Werner Schmidt

Gunter Schoene

Raman Sood

Thermally splitting hydrate of aluminum chloride to produce aluminum oxide wherein the hydrate is at least partially split by contact with hot gases and hot calcined product in a turbulent zone, transmitting the material from the turbulent zone into a residence zone, recycling a portion of the solids from the residence zone to the turbulent zone in an amount to maintain a desired suspension density while the remainder is passed to a turbulent cooling zone in heat exchange with the fluidizing gas introduced into the turbulent zone.

Method of thermally splitting hydrate of aluminum chloride

The thermal decomposition of aluminum chloride hydrate in which the preponderant portion of the hydrate is thermally decomposed in an indirectly heated reaction chamber while in a fluidized state with any remainder thermally decomposed in a directly heated rotary furnace and passing the formed aluminum oxide in heat exchange with combustion gases to cool the aluminum oxide and to preheat the combustion gases.

Process for the thermal decomposition of aluminum chloride hexahydrate

Thermal decomposition of aluminum chloride hydrate in a fluidized bed reactor in which the concentration of solids diminishes from the bottom upwards, the improvement wherein most of the hydrogen chloride is removed from the hydrate by direct heat and the largely decomposed aluminum chloride is fed into a calcining reactor and from the calcining reactor to a residence time reactor fluidized at low gas velocity, recycling solids from the residence reactor to the calcining reactor in an amount to adjust the suspension density and feeding the remainder to a cooler after sufficient time in the residence reactor.

Process for thermal decomposition of aluminum chloride hydrates by

Process for the thermal decomposition of aluminum chloride hexahydrate into anhydrous Al.sub.2 O.sub.3, comprising predrying and then decomposition in a fluidization reactor, the said fluidization being ensured by recycled gaseous HCl, and finally heating at the temperature necessary to obtain the desired crystallization state, namely anhydrous Al.sub.2 O.sub.3, the said pre-drying being carried out by the gases coming from this final heating.

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Chemin des Trois Moulins, France

Philippe Marchessaux