The modified red mud reduction smelting
DOI:
https://doi.org/10.31643/2018/6445.12Keywords:
high-iron bauxite, red mud, ferruginous hydrogarnete, reduction melting, cast iron, slag, rare earth elements, titanium dioxide.Abstract
The article presents the results of investigations of complex processing of red mud obtained from high-alumina bauxites of alumina production by the smelting reduction method. Red mud is a production waste that contains useful components and can used as a complex raw material for the production of pig iron, rare earth element (REE) concentrates and titanium dioxide. Known methods of red mud processing by the smelting reduction method have not found application because of the impossibility of obtaining slag with low iron content. The urgency of the problem solved by the research is in the need of ways for red mud recycling. As a result, a method for processing the modified red mud by the smelting reduction was developed to produce cast iron and an oxide-free slag containing rare earth elements and titanium dioxide. The method consists in the preliminary treatment of red mud in a high-modulus alkaline solution at a temperature of 240-260 ° C with the addition of calcium oxide to the pulp from the calculation for obtaining a modified red mud – a hydrogarnete slurry those main compound is the ferrous garnet-3CaO ∙ Fe2O3 ∙ 2SiO2 ∙ 2H2O. Reducing melting of the hydrogarnete slurry has made it possible to produce cast iron, and after magnetic separation – a nonmagnetic slag fraction containing 0.22 % of iron, which determines the possibility of obtaining high-quality REE concentrates and titanium dioxide in hydrometallurgical processing. The extraction of iron into cast iron is 88.0 %, into the magnetic fraction – 11.9 %, into the non-magnetic fraction – 0.1 %. The extraction of titanium into the magnetic fraction was 34.3 %, and in the nonmagnetic fraction was 65.7 %. The recovery of REE into the nonmagnetic fraction was 65.7 %.
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Copyright (c) 2022 Abdulvaliev, R., Akhmadieva, N., Gladyshev, С., Imangalieva, L., & Manapova, А.
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