Recovery of Fe, Al, Ti with low lime sintering from bauxite residue

摘要

Bauxite residue, which contains considerable amounts of iron, aluminum and titanium, is a solid waste produced in the process of alumina extraction from bauxite.This paper researched the recovery of iron, aluminum, titanium from bauxite residue using low lime sintering and carbothermic reduction, which aimed at decreasing the clinke and energy consumption.Reduced iron obtained by magnetic separation separated with sintered clinker very well.In the sintered clinker, the main alumina-containing mineral is 2CaO·A12O3·SiO2 as well as some 1 1.3CaO·7Al2O3, while the titanium-containing mineral is CaTiO3.2CaO·Al2O3·SiO2 and 11.3CaO·7A12O3 are easy to be extracted in 20％ sulfuric acid at 80℃, and CaTiO3 is easy to be extracted in 60～80％ sulfuric acid above 120℃.The recovery efficiencies of iron, aluminum and titanium in bauxite residue are 95.16％, 93.60％ and 95.59％ respectively.