Method for recovering iron by utilizing high-iron red mud, and method for extracting aluminum by utilizing high-iron red mud

Abstract

The invention provides a method for recovering iron by utilizing high-iron red mud. The method for recovering the iron by utilizing the high-iron red mud comprises the following steps of S1, placing the high-iron red mud in an airtight reduction furnace, feeding flare gas into the reduction furnace, and carrying out heating reduction so as to obtain a reduced material; and S2, after grinding the reduced material, carrying out magnetic separation so as to obtain magnetic separation concentrates and magnetic separation tailings, wherein the magnetic separation concentrates are iron ore concentrates; and the magnetic separation tailings are aluminum oxide enriched ores. The iron therein can be recovered, the flare gas can be utilized at the same time, and the atmospheric pollution produced byflare gas combustion of the petrochemical enterprise is avoided. The invention further provides a method for extracting aluminum by utilizing the high-iron red mud. The method for extracting the aluminum by utilizing the high-iron red mud comprises the steps of A1, treating the high-iron red mud by adopting the method so as to obtain magnetic separation concentrates and magnetic separation tailings; A2, after uniformly mixing the magnetic separation tailings, ammonium sulfate and water, roasting to obtain a roasted clinker; and A3, dissolving out the roasted clinker, and separating to obtainan aluminum-containing solution and residues after extracting the aluminum. The iron, the aluminum and silicon in the magnetic separation tailings are separated, so that the aim on comprehensively utilizing the high-iron red mud is achieved.

Description

technical field [0001] The invention belongs to the technical field of mineral processing and metallurgy, and in particular relates to a method for recovering iron by using high-iron red mud and a method for extracting aluminum by using high-iron red mud. Background technique [0002] Red mud is the waste residue produced during the production of alumina. The output of red mud varies with ore grade, production method and technical level. Every time 1 ton of alumina is produced in my country, 1.0-1.7 tons of red mud will be produced along with it. At present, the cumulative stockpiled red mud exceeds 400 million tons. A large amount of red mud cannot be effectively used and can only be stacked in a large area, which not only takes up a lot of land, but also causes serious pollution to the environment due to the high alkalinity of red mud, which has become a major environmental hazard. [0003] Red mud is rich in rare metal elements such as iron, titanium, aluminum, sodium, r...

AI Technical Summary

Problems solved by technology

However, due to the small particle size of red mud particles and the coating phenomenon between them, it is difficult to separate iron-containing components such as iron minerals by conventional physical separation.