A study on the preparation of fine and low soda alumina |
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Authors: | Yi Yong Park Suong Oh Lee Tam Tran Seong Jun Kim Myong Jun Kim |
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Affiliation: | aDepartment of Civil, Geo and Environmental Engineering, Chonnam National University, Republic of Korea;bKC Corporation, Chonnam, Republic of Korea;cSchool of Chemical Engineering and Industrial Chemistry, UNSW, Sydney, 2052, Australia |
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Abstract: | A simple process to produce fine and low soda α-alumina (α-Al2O3) from a commercial grade aluminium trihydroxide (gibbsite, Al(OH)3) produced by KC Corporation Ltd was developed. There are two options for this process with the first one producing low soda α-alumina (< 0.05% Na2O) having a mean particle size of 50 μm. The second option yields a fine product with a mean size of less than 10 μm. In the first option, a plant aluminium trihydroxide containing 0.20% Na2O was first fluidized with nitrogen at 400–600 °C to yield an amorphous activated alumina. This intermediate product was then treated with acetic or oxalic acid, washed with water and heated to 1200 °C to form calcined α-alumina, having a Na2O content of less than 0.05%. A 20 min leaching using 0.2 M acetic or oxalic acid could yield an alumina product containing 0.04% Na2O. In the second option, a new technique for the preparation of fine and low soda α-alumina was evaluated using an attrition mill working also as a leaching vessel at 80 °C. Fine (< 10 μm in mean particle size) and low soda (< 0.04% Na2O) alumina was produced by a 20 min leaching step with 0.2 M acetic acid and concurrent attrition milling. |
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Keywords: | bayer process low soda alumina fine alumina activated alumina aluminium trihydroxide |
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