Method for recovering iron and aluminum from red mud

Abstract

The disclosure relates to a method for recovering an iron and aluminum from a red mud, which includes the following steps: providing a red mud, a mass percentage of an alumogoethite is not less than 20% and a mass percentage of Fe2O3 is not less than 40% in the red mud; mixing the red mud with a circulating mother liquor and an additive and performing a wet treatment above 260° C. to obtain an ore pulp; performing a liquid-solid separation on the ore pulp after the ore pulp is flash evaporated, to obtain a separated iron material and a separated liquid; performing a seed precipitation on the separated liquid after the separated liquid is refined, or performing a seed precipitation on the separated liquid after the separated liquid is combined with an existing refined liquid; and, preforming an iron separation on the separated iron material after washed to obtain an iron concentrate. The additive includes an alkaline earth metal compound. The alkaline earth metal compound is at least one of a calcium oxide, a calcium hydroxide, a magnesium oxide and a magnesium hydroxide.

Dependencies are inferred from the claim text.