Method for efficiently treating steel metallurgical dust and co-producing and directly reducing iron powder
A technology for reducing iron powder and dust, which is applied in chemical instruments and methods, solid separation, magnetic separation, etc., can solve problems such as unsatisfactory treatment effect, and achieve the effect of good strength
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Embodiment 1
[0037] First add blast furnace dust to the disc pelletizer to make a spherical core, control the growth time of the mother core to 2 minutes, the growth time of the spherical core to 10 minutes, and control the diameter of the spherical core to 10 mm, then add electric furnace dust to control the growth of the spherical shell The pellet compaction time is 6 minutes, and the compacting time of the pellets is 3 minutes to form a spherical shell covering the core, that is, to obtain a blast furnace dust / electric furnace dust composite pellet with a core-shell structure. The final diameter of the pellet is 13mm, and the carbon element and iron in the pellet The molar ratio of oxygen in the oxide is 0.55.
[0038] The indicators of the green and dry balls of the composite pellets obtained in Example 1 are: the drop strength of the green balls is 5.2 times / 0.5m, and the compressive strength of the green balls is 13.2N / p.
[0039] After the above pellets were dried at 105°C for 4 h, ...
Embodiment 2
[0044] First add blast furnace dust to the disc pelletizer to make a spherical core, control the growth time of the mother core to 2 minutes, the growth time of the spherical core to 12 minutes, and control the diameter of the spherical core to 10 mm, then add electric furnace dust to control the growth of the spherical shell The time is 5 minutes, the compacting time of the pellets is 3 minutes, and a spherical shell covering the core is formed, that is, a blast furnace dust / electric furnace dust composite pellet with a core-shell structure is obtained. The final diameter of the pellet is 12.5mm, and the carbon element in the pellet and The molar ratio of oxygen element in iron oxide is 0.70.
[0045] The indicators of the green and dry balls of the composite pellets obtained in Example 2 are: the drop strength of the green balls is 4.1 times / 0.5m, and the compressive strength of the green balls is 11.1N / p.
[0046] After the above pellets were dried at 105°C for 4 h, they we...
Embodiment 3
[0051] First add blast furnace dust to the disc pelletizer to make a spherical core, control the growth time of the mother core to 2 minutes, the growth time of the spherical core to 14 minutes, and control the diameter of the spherical core to 11 mm, then add electric furnace dust to control the growth of the spherical shell The time is 4 minutes, and the compacting time of the pellets is 3 minutes to form a spherical shell covering the core, that is, to obtain a blast furnace dust / electric furnace dust composite pellet with a core-shell structure. The final diameter of the pellet is 13mm, and the carbon element and iron in the pellet The molar ratio of oxygen element in the oxide is 0.65.
[0052] The indicators of the green and dry balls of the composite pellets obtained in Example 3 are: the drop strength of the green balls is 4.6 times / 0.5m, and the compressive strength of the green balls is 12.3N / p.
[0053] After the above pellets were dried at 105°C for 4 h, they were ...
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