Title:
【発明の名称】アルミナ三水和物からアルミナの製造を行うための焼成方法およびその装置
Document Type and Number:
Japanese Patent JPH05503064
Kind Code:
A
Abstract:
A process for producing alumina is described in which the efficiency of calcination is greatly improved by utilizing a total heat exchange system in which alumina hydrate is heated stepwise in a plurality of heat exchange stages to sequentially higher temperatures approaching calcining temperatures and is then fed to a calciner for final conversion to alumina, and the calcined alumina is cooled in a plurality of heat exchange stages, with sensible heat being transferred from the calcined alumina cooling stages to the alumina hydrate heating stages at a temperature in each stage only slightly higher than the temperature of a heating stage or at which the heat is consumed in that stage. Further efficiency in the system may be obtained by predrying the alumina hydrate to remove superficial moisture using air from the system. Furthermore, exhaust gases from the calciner may be used to preheat combustion and fluidizing air for the calciner.
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Inventors:
Fulford, Denison George
Application Number:
JP50001990A
Publication Date:
May 27, 1993
Filing Date:
November 23, 1990
Export Citation:
Assignee:
ALCAN INTERNATIONAL LIMITED
International Classes:
B01J8/26; B01J6/00; C01F7/445; F27B15/14; (IPC1-7): B01J8/26; C01F7/44; F27B15/14
Attorney, Agent or Firm:
Aoyama Ryo (2 outside people)