公开(公告)号：US20240308868A1

公开(公告)日：2024-09-19

申请号：US18570800

申请日：2022-06-17

Applicant: The University of Adelaide

Inventor： Woei Lean Saw ,  Graham Jerold Nathan ,  Raymond Victor Chatfield ,  Ross Jeffrey Haywood

IPC: C01F7/444

CPC classification number: C01F7/444

Abstract: An improved apparatus for steam calcining aluminium trihydroxide (Al(OH)3) to produce alumina (Al2O3) is disclosed. The apparatus comprises an Al(OH)3 preheater configured to heat an Al(OH)3feedstock by contacting it with steam. The Al(OH)3 preheater comprises at least one gas solid separator for separating preheated Al(OH)3 from carrier steam. The apparatus further comprises a calciner configured to accept preheated Al(OH)3 from the Al(OH)3 preheater and to produce heated Al2O3 by steam calcination. The apparatus also comprises an Al2O3 cooler configured to remove heat from the heated Al2O3 and produce Al2O3 product. The Al2O3 cooler comprises at least one gas solid separator. The apparatus further comprises a steam compressor in fluid communication with the Al(OH)3 preheater, the calciner and the Al2O3 cooler and configured to accept and pressurise carrier steam from the Al(OH)3preheater and to provide pressurised carrier steam to the Al(OH)3 preheater and pressurised carrier steam the Al2O3 cooler to transfer Al(OH)3 feedstock to and within the Al(OH)3 preheater, and pressurised carrier steam to transfer preheated Al(OH)3 from the Al(OH)3 preheater to the calciner, and to transfer heated Al2O3 from the calciner to and within the Al2O3 cooler.