FIELD: metallurgy.
SUBSTANCE: proposed method comprises stock pelletizing and two-stage high-temperature calcination. said stock represents red mud while high-temperature calcination is divided into oxidative calcination and reducing calcination processes. Note here that oxidative calcination is carried out at 1000-1150°C in airflow. Note also that reducing calcination is performed at 1100-1200°C using coke as reducer in amount of 45-55 wt % of the weight of pellets.
EFFECT: reduced content of sulfur, phosphorus and alkaline compounds, higher strength.
2 cl, 2 dwg
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