Improvement of Sodium Leaching Ratio of Ferric Bauxite Sinter after Direct Reduction

Abstract

Abstract:The sodium leaching ratio (η N ) of ferric bauxite direct reduction process is much lower than that of ordinary bauxite; thus, the former consumes more sodium than the latter. η N can be promoted by increasing the dosage of sodium or restricted by increasing the heating temperature and time. However, the restriction effect of heating temperature is 16.67 times larger than that of heating time, and the restriction effect decreases 47.03 times faster when heating temperature increases than that process of heating time. These imply that η N improves with the increasing sodium carbonate dosage and the decreasing heating temperature.

Promote Alumina Leaching through Re-Pelleting: Effects of Directional Coating of Calcite on Silicate Grains

“…It connects direct reduction and leaching processes together, which may convert diaspore and boehmite into water-soluble aluminate by reacting with added sodium carbonate while reducing hematite and goethite into elemental iron and then recycling them through magnetic separation from leach residue. Further information on this new manner was discussed in our previous reports [16][17][18][19][20][21]. Some defects in this method were also observed, such as the excessive demand of Na 2 CO 3 [18,19].…”