A single weak magnetic iron ore including hematite, siderite, limonite and hematite siderite ore stone. As a result of mineral species, size of embedded (see mineral size ) range, the processing method is also more. The methods commonly used for magnetization roasting magnetic separation and gravity separation, flotation, or one of the combined process of strong magnetic separation composition, can also be used alone re-election, flotation, magnetic separation, or which is formed by the combined process of. Fine to fine weakly magnetic iron ore flotation method commonly used, including the process of positive and reverse flotation of two processes; but when the mineral composition of more complex, with other methods is difficult to be good indicators, using the magnetic roasting magnetic separation method is effective;20 ~75mm block mine shaft furnace roasting reduction;20mm powder ore high intensity magnetic separation, gravity separation, flotation of commonly used methods and the process of separating;2 ~ 20mm coarse and weakly magnetic iron ore mainly by gravity and high intensity magnetic separation; coarse and greater than20mm are extremely coarse ore gravity separation used in heavy medium separation or jigging separation; to fine ore with spiral chute, shaker, centrifugal separation and membrane flow gravity method; rough, medium grain ore strong magnetic commonly used dry induced roller type strong magnetic separator; fine ores commonly used induction medium wet strong magnetic separator. Due to the high intensity magnetic separation fine ore concentrate grade is not high, and the new unit capacity is low, so often use strong magnetic gravity combined process.
Sedimentary type of oolitic hematite siderite and hematite in an iron minerals are mainly hematite and siderite, gangue with chamosite, quartz and calcite. Minerals often particle inlay, gangue and close symbiosis in oolitic structure, is not easy to monomer dissociation, the ore difficult to choose. If you are rich or self fluxing ore, with the heavy medium separation, jigging dry magnetic separation method or eliminate gangue, have massive finished ore; if it is more rich oolitic ore roasting magnetic separation method, commonly used. Lean oolitic ore, even with the roasting magnetic separation, concentrate grade is also difficult to achieve50% above, can be associated with other high-grade ore ore matching or by direct reduction and Flotation-Metallurgy process.
Hydrothermal quartz and hematite limonite hematite ore Shi Chang for inhomogeneous dissemination, by gravity, high intensity magnetic separation, flotation and other components of the combined process of separating. Multiple metal weakly magnetic iron ore mainly hydrothermal and sedimentary phosphorus or sulfide or hematite siderite ore. This kind of ore, flotation, generally using gravity separation high intensity magnetic separation, or their combination process of recovering iron minerals by flotation recovery, phosphorus or sulfide.