Fired pellets for reduction and method for producing same
Abstract
Fired pellets for use in a solid reduction furnace that are effective in preventing clustering by reducing the possibility of contact between low-melting-temperature slags and thus preventing the fusion therebetween, and a method for producing such fired pellets. Fired pellets for reduction, wherein the proportion of high-viscosity slag components (Al 2 O 3 +MgO+SiO 2 ) to the total Fe (T.Fe) satisfies an expression: (Al 2 O 3 +MgO+SiO 2 )/T.Fe≥0.09, and a method for producing the same. In the expression, Al 2 O 3 represents the concentration (mass %) of Al 2 O 3 in the fired pellets, MgO represents the concentration (mass %) of MgO in the fired pellets, SiO 2 represents the concentration (mass %) of SiO 2 in the fired pellets, and T.Fe represents the concentration (mass %) of T.Fe in the fired pellets.
Claims
exact text as granted — not AI-modified1 . Fired pellets for reduction,
wherein a proportion of high-viscosity slag components (Al 2 O 3 +MgO+SiO 2 ) to total Fe (T.Fe) satisfies the following Expression (1):
(
Al
2
O
3
+
MgO
+
SiO
2
)
/
T
.
Fe
≥
0.09
,
(
1
)
where Al 2 O 3 represents a concentration (mass %) of Al 2 O 3 in the fired pellets,
MgO represents a concentration (mass %) of MgO in the fired pellets,
SiO 2 represents a concentration (mass %) of SiO 2 in the fired pellets, and
T.Fe represents a concentration (mass %) of T.Fe in the fired pellets.
2 . Fired pellets for reduction,
wherein a proportion of high-viscosity slag components (Al 2 O 3 +MgO+SiO 2 ) to total Fe (T.Fe) satisfies the following Expression (2):
(
Al
2
O
3
+
MgO
+
SiO
2
)
/
T
.
Fe
≥
0.12
,
(
2
)
where Al 2 O 3 represents a concentration (mass %) of Al 2 O 3 in the fired pellets,
MgO represents a concentration (mass %) of MgO in the fired pellets,
SiO 2 represents a concentration (mass %) of SiO 2 in the fired pellets, and
T.Fe represents a concentration (mass %) of T.Fe in the fired pellets.
3 . The fired pellets for reduction according to claim 1 ,
wherein a porosity is 20% or more.
4 . The fired pellets for reduction according to claim 1 ,
wherein a porosity is 30% or more.
5 . A method for producing the fired pellets for reduction according to claim 1 , wherein
reduction and firing are performed by using an iron-containing raw material formulated to achieve an average LOI (Loss on Ignition) of 5% or more.
6 . The method for producing the fired pellets for reduction according to claim 5 , wherein
the iron-containing raw material has been subjected to a crystal water removal pretreatment in advance so as to achieve an average LOI (Loss on Ignition) of 2% or less.
7 . The method for producing the fired pellets for reduction according to claim 6 , wherein
the crystal water removal pretreatment comprises heating and drying using a rotary kiln and using a measurement value of a sample at the exit side of the kiln as the average LOI (Loss on Ignition) of the iron-containing raw material.
8 . The method for producing the fired pellets for reduction according to claim 5 , wherein
a mixed raw material containing 4 mass % to 24 mass % M.Fe is prepared by mixing a raw material containing M.Fe, and the mixed raw material is granulated and fired.
9 . The method for producing t fired pellets for reduction according to claim 8 , wherein
the raw material is reduced iron having a particle size of 3 mm or less that has been reduced in a solid reduction furnace.
10 . The method for producing the fired pellets for reduction according to claim 9 , wherein
the reduced iron contains 78 mass % or more M.Fe.Join the waitlist — get patent alerts
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