HCl-beneficiation of bauxites for the manufacture of refractories

Phase and chemical analysis of a fused refractory based on bauxite concentrate

“…8, see Table i). The technological characteristics of the refractories obtained from the powders of the fused material are not dealt with in detail in this paper; however, we note that they possess a favorable (satisfactory) structure and phase composition and high strength [2].…”

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Bauxite concentrate is a promising raw material for producing high-alumina refractories that are used in the ladles designed for out-of-furnace treatment of steels [i].The purpose of this work is to study the structure and the properties of the fused refractories made from a bauxite concentrate obtained by hydrochloric acid treatment [2].Mullite-based solid solutions (having a basicity >1.5) constitute the main crystalline phase of the refractories obtained from bauxite and its concentrate [2][3][4]. The phase diagram of the AI203-SiO2 system gives an approximate phase constitution of the aluminosilicate refractories (including the fused refractories) as a functionof the chemical composition.

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High-alumina raw materials in Russia

“…The difficulty of the method consists in the preliminary washing and drying of the bauxite for the color of the lumps to be better manifested. Another group of methods is based on reduction firing of bauxites with subsequent magnetic separation of iron-containing lumps and acid treatment for the removal of iron [14]. These method_s, and especially the chemical one, give a rather pure concentrate but are comparatively expensive.…”

Refractories for vacuum degassing of steel

“…In the steel industry the use of bauxites with 60-88 wt. % AI203 is increasing for the production of ladle parts and ranching compounds, the use of which in ladles for outside-the-furnace treatment makes it possible to obtain high-quality steel with minimum expenditures of energy for preliminary heating of the lining and heating between heats with a sufficiently long life (30-70 heats) [4].Therefore the development of outside-the-furnace treatment has determined the directions of developments of new forms of refractories such as the use of primarily pure and frequently synthetic magnesia, chrome, high-alumina (bauxite), and lime-periclase materials and broadening of the production of parts using energy saving methods (unfired, pitch-bonded and pitchimpregnated, periclase-carbon heat treated concretes, and unformed refractories). …”