Novel method for sintering fine iron powder pellets
A technology of fine iron powder and a new method, which is applied in the field of iron and steel metallurgy, can solve the problems of unreasonable fuel distribution in the material layer, poor sintering gas permeability, and poor sinter strength, so as to improve high-temperature oxidation and consolidation effects, reduce coke ratio, The effect of temperature uniformity
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Embodiment 1
[0063] The coarse-grained limestone, dolomite and returned ore are pretreated by ball milling until the particle size is less than 0.074mm, accounting for about 65%, and the finely ground material and iron fine powder are further subjected to high-pressure roller grinding to a specific surface area of 1710cm. 2 / g; then add bentonite, the amount of bentonite is 0.8% for mixing, and the binary basicity (CaO / SiO) is controlled. 2 mass ratio) is 1.90, MgO content is 2.0, SiO 2 The content is 5.25%; the mixed material is pelletized, the pelletizing moisture is controlled to 8.5%, and the pelletizing time is 12min. The obtained green pellets have a compressive strength of 13.3N / piece, a drop strength of 5.5 times / (0.5m), and a burst temperature of 340 ℃, the particle size of the raw meal is 10-16mm, and the raw ball index meets the industrial requirements; all the obtained raw balls are rolled out of coke powder, the amount of coke powder is 3.6%, and the air permeability resista...
Embodiment 2
[0066] The coarse-grained limestone, dolomite and returned ore are pretreated by ball milling until the particle size is less than 0.074mm, accounting for about 65%, and the finely ground material and iron fine powder are further subjected to high-pressure roller grinding to a specific surface area of 1710cm. 2 / g; then add bentonite, the amount of bentonite is 0.8% for mixing, and the binary basicity (CaO / SiO) is controlled. 2 mass ratio) is 1.90, MgO content is 2.0, SiO 2 The content is 5.25%; the mixed material is pelletized, the pelletizing moisture is controlled to 8.5%, and the pelletizing time is 12min. The obtained green pellets have a compressive strength of 13.3N / piece, a drop strength of 5.5 times / (0.5m), and a burst temperature of 340 ℃, the particle size of the raw meal is 10-16mm, and the raw ball index meets the industrial requirements; all the obtained raw balls are rolled out of coke powder, the amount of coke powder is 3.2%, and the air permeability resista...
Embodiment 3
[0069] The coarse-grained limestone, dolomite and returned ore are pretreated by ball milling until the particle size is less than 0.074mm, accounting for about 65%, and the finely ground material is further subjected to high-pressure roller grinding to a specific surface area of 1710cm. 2 / g; then add bentonite, the amount of bentonite is 0.8% for mixing, and the binary basicity (CaO / SiO) is controlled. 2 mass ratio) is 1.90, MgO content is 2.0, SiO 2 The content is 5.25%; the mixed material is pelletized, the pelletizing moisture is controlled to 8.5%, and the pelletizing time is 12min. The obtained green pellets have a compressive strength of 13.3N / piece, a drop strength of 5.5 times / (0.5m), and a burst temperature of 340 ℃, the particle size of the raw meal is 10-16mm, and the green ball index meets the industrial requirements; all the obtained green balls are rolled out of coke powder, the amount of coke powder is 3.0%, and the air permeability resistance of the materia...
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