METHOD FOR INTEGRATED TREATMENT OF RED MUD Russian patent published in 2014 - IPC C22B7/00 

FIELD: chemistry.

SUBSTANCE: method includes magnetic-gravitational treatment of red mud. The starting red mud first undergoes dispergation in the presence of sodium hexametaphosphate in a rotary-pulsation apparatus, followed by low-gradient wet magnetic separation in a field with strength of 0.1-0.15 T to obtain a magnetite and a bulk concentrate, subjecting the bulk concentrate to high-gradient magnetic separation in two steps in a field with a strength of not less than 1.2 T to extract magnetic and nonmagnetic fractions, subjecting the magnetic fraction to gravitational concentration on a concentration table to obtain a hematite concentrate and tailings, combining the nonmagnetic fraction with the tailings from gravitational concentration and performing two-step selective flocculation in the presence of a flocculant to separate a component which primarily consists of aluminium and silicon oxides from an iron-containing product, which is concentrated by high-gradient magnetic separation with field strength of 0.5-0.7 T to obtain an additional iron-containing product, which is combined with the hematite concentrate to obtain an iron-containing concentrate, and residual aluminosilicates which are combined with the component primarily consisting of aluminium and silicon oxides to obtain an aluminosilicate product.

EFFECT: high degree of extraction of iron into an iron-containing product and obtaining an aluminosilicate product with high iron content.

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