Separation process of refractory iron ore
A sorting and iron ore technology, applied in magnetic separation, solid separation, chemical instruments and methods, etc., can solve the problems of low concentrate grade, unstable process, high roasting temperature, and achieve less loss of useful minerals and reaction conditions. The effect of relaxation, stable and easy-to-control process
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Embodiment 1
[0031] An oolitic hematite in eastern Chongqing contains 40.56% iron and 1.02wt% phosphorus. The useful minerals are mainly red limonite, and the embedded particle size is fine. After the raw ore is crushed to no more than 5mm, the high-pressure roller mill is used for fine crushing, and the wind force gas phase classification is used to obtain finely crushed mineral materials with a particle size of not greater than 1mm, and the weight of -0.1mm (that is, not greater than 0.1mm) particle size mineral materials accounts for the weight of finely crushed mineral materials 75% of that; put the material into a suspension magnetization roasting furnace and roast it in an oxygen-free atmosphere. The roasting conditions are: the volume fraction of CO in a reducing atmosphere is 30%, and the CO 2 The volume fraction is 70%, the roasting temperature is 560°C, the roasting time is 450s, the cold wind speed is 2.1m / s, and the useful mineral is Fe 3 o 4 The roasted material; the composit...
Embodiment 2
[0038] The grade of TFe in the raw ore is 38.91%. According to the phase analysis of iron, the iron in this iron ore mainly occurs in siderite, and its content is 24.98wt%. The second part of iron is hematite and limonite. Form exists, the iron content is 16.67wt%; another 0.28wt% iron exists in other iron-bearing minerals.
[0039] Steps:
[0040] The dry and powdery raw ore is subjected to flash magnetization roasting in a suspension magnetization roaster under high-temperature reducing atmosphere conditions to obtain useful minerals as Fe 3 o 4 The roasted material, wherein, the volume fraction of CO in the reducing atmosphere is 25%, CO 2 The volume fraction is 75%, the roasting temperature is 520°C, and the roasting time is 350s; before roasting, the ore feeding particle size is not greater than 1mm, and -0.1mm particle size ore accounts for 81wt%; the feeding cooling air volume: 1.5m 3 / h, pressure 0.04MPa; hot air volume: 4m 3 / h, the apparent wind speed in the su...
Embodiment 3
[0044] The grade of TFe in the raw ore is 36.22%. According to the phase analysis of iron, the iron in the iron ore mainly occurs in limonite, with a content of 25.20wt%. The content is 10.15wt%; another 0.87wt% iron exists in other iron-containing minerals.
[0045] Steps:
[0046] The raw ore is subjected to suspension magnetization roasting in a suspension magnetization roasting furnace under high-temperature reducing atmosphere conditions to obtain useful minerals as Fe 3 o 4 The roasted material, wherein, the volume fraction of CO in the reducing atmosphere is 20%, CO 2 The volume fraction is 80%, the roasting temperature is 550°C, and the roasting time is 355s; before roasting, the ore feeding particle size is not greater than 1mm, and -0.1mm particle size mineral materials account for 90wt%; the feeding cooling air volume: 1.8m 3 / h, pressure 0.05MPa; hot air volume: 4.5m 3 / h, the apparent wind speed in the suspension magnetization roasting furnace is 0.48m / s.
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