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agglomerate alumina Andhra Pradesh Bailadila balls bands beneficiation Bihar blast furnace blue dust boreholes briquetting capacity carbon chemical coal coke consumption contains crushers crushing cyclones developed district drilling exploration export feed ferrite flotation gangue minerals geological goethite grade Fines gravity grinding gyratory haematite high grade hills important increase India industry iron and steel iron content iron formation iron ore concentrate iron ore deposits iron ore mines Karnataka Keonjhar kiln KIOCL Kudremukh laminated laterite limonite located low grade Lumps Madhya Pradesh magnetic separation magnetite Maharashtra material medium grade mesh million tonnes mills NMDC occur operation orebody Orissa pelletisation pellets percent Fe percent iron phosphorus phyllites pig iron powdery preheating production quartz quartzite recovery reserves rocks rotary samples Sandur schist SCREEN siderite silica Singhbhum sinter slag slurry spirals sponge iron steel plants Table tailings temperature tonnes transportation unclassified grade zone