A complex study of the hydrogen reduction of nanosized iron hydroxide Fe(OH) 3 at 400°C was performed. It was shown that, during the reduction of Fe(OH) 3 to iron metal α Fe, intermediate compounds such as Fe(OH) 2 , α FeOOH, β FeOOH, γ FeOOH, δ FeOOH, and FeO are formed along with stable iron oxides α Fe 2 O 3 , γ Fe 2 O 3 , and Fe 3 O 4 . A scheme of chemical and structural transformations that occur in the reduction of nanosized Fe(OH) 3 is presented. The scheme takes into account the possibility of the bifurcation mechanism of reaction development.
Red mud is a by-product of alumina industry which is currently almost completely stored in landfill sites without further use. It contains considerable amounts of valuable components such as iron, aluminum, titanium and rare-earth metals. The reduction smelting of red mud was carried out in laboratory scale to recover iron and obtain slag suitable for use in the construction industry. It has been shown that it is expedient to obtain pig iron and slag from the unprocessed red mud. Those two are suitable for the subsequent leaching of aluminum, titanium and rare-earth metals. It is practical to process dealkalized red mud, with composition adjustment by CaO and Al2O3 addition, in order to obtain pig iron and slag in the form of aluminous clinker.
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