US2026043102A1PendingUtilityA1
Non-fired pellets for reduction and method for producing same
Est. expiryAug 1, 2042(~16 yrs left)· nominal 20-yr term from priority
Inventors:TAKEHARA KENTAYAMAMOTO TETSUYAHIGUCHI TAKAHIDEIWAMI YUJIFUJIWARA SHOHEIMORITA YUYAHORITA KenyaHIROSAWA TOSHIYUKIIGAWA DAISUKE
C21B 13/105C21B 13/008C21B 13/0046C22B 1/2406Y02P10/20C22B 1/243
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Claims
Abstract
Non-fired pellets are used in a solid reduction furnace and are effective in preventing clustering by reducing the possibility of contact between low-melting-temperature slags and thus preventing the fusion therebetween. A method produces such non-fired pellets. Non-fired pellets for reduction, in which 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≥0.12, 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 non-fired pellets, MgO represents the concentration (mass %) of MgO in the non-fired pellets, SiO 2 represents the concentration (mass %) of SiO 2 in the non-fired pellets, and T.Fe represents the concentration (mass %) of T.Fe in the non-fired pellets.
Claims
exact text as granted — not AI-modified1 . Non-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
.12
,
(
1
)
where Al 2 O 3 represents a concentration (mass %) of Al 2 O 3 in the non-fired pellets,
MgO represents a concentration (mass %) of MgO in the non-fired pellets,
SiO 2 represents a concentration (mass %) of SiO 2 in the non-fired pellets, and
T.Fe represents a concentration (mass %) of T.Fe in the non-fired pellets.
2 . Non-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
.15
,
(
2
)
where Al 2 O 3 represents a concentration (mass %) of Al 2 O 3 in the non-fired pellets,
MgO represents a concentration (mass %) of MgO in the non-fired pellets,
SiO 2 represents a concentration (mass %) of SiO 2 in the non-fired pellets, and
T.Fe represents a concentration (mass %) of T.Fe in the non-fired pellets.
3 . A method for producing the non-fired pellets for reduction according to claim 1 , further comprising
using an iron-containing raw material formulated to achieve an average LOI (Loss on Ignition) of 5% or more.
4 . The method for producing the non-fired pellets for reduction according to claim 3 , wherein
the iron-containing raw material has been pretreated for removal of crystal water in advance so as to achieve an average LOI (Loss on Ignition) of 2% or less.
5 . The method for producing the non-fired pellets for reduction according to claim 3 , wherein
a mixed raw material containing 4 mass % to 24 mass % M.Fe is prepared by mixing a raw material containing M.Fe and is granulated.
6 . The method for producing the non-fired pellets for reduction according to claim 5 , wherein
the raw material is reduced iron with a particle size of 3 mm or less that has been reduced in a solid reduction furnace.
7 . The method for producing the non-fired pellets for reduction according to claim 6 , wherein
the reduced iron contains 79 mass % or more M.Fe.
8 . A method for producing the non-fired pellets for reduction according to claim 2 , further comprising
using an iron-containing raw material formulated to achieve an average LOI (Loss on Ignition) of 5% or more.
9 . The method for producing the non-fired pellets for reduction according to claim 8 , wherein
the iron-containing raw material has been pretreated for removal of crystal water in advance so as to achieve an average LOI (Loss on Ignition) of 2% or less.
10 . The method for producing the non-fired pellets for reduction according to claim 4 , wherein
a mixed raw material containing 4 mass % to 24 mass % M.Fe is prepared by mixing a raw material containing M.Fe and is granulated.
11 . The method for producing the non-fired pellets for reduction according to claim 8 , wherein
a mixed raw material containing 4 mass % to 24 mass % M.Fe is prepared by mixing a raw material containing M.Fe and is granulated.
12 . The method for producing the non-fired pellets for reduction according to claim 9 , wherein
a mixed raw material containing 4 mass % to 24 mass % M.Fe is prepared by mixing a raw material containing M.Fe and is granulated.
13 . The method for producing the non-fired pellets for reduction according to claim 10 , wherein
the raw material is reduced iron with a particle size of 3 mm or less that has been reduced in a solid reduction furnace.
14 . The method for producing the non-fired pellets for reduction according to claim 11 , wherein
the raw material is reduced iron with a particle size of 3 mm or less that has been reduced in a solid reduction furnace.
15 . The method for producing the non-fired pellets for reduction according to claim 12 , wherein
the raw material is reduced iron with a particle size of 3 mm or less that has been reduced in a solid reduction furnace.
16 . The method for producing the non-fired pellets for reduction according to claim 13 , wherein
the reduced iron contains 79 mass % or more M.Fe.
17 . The method for producing the non-fired pellets for reduction according to claim 14 , wherein
the reduced iron contains 79 mass % or more M.Fe.
18 . The method for producing the non-fired pellets for reduction according to claim 15 , wherein
the reduced iron contains 79 mass % or more M.Fe.Join the waitlist — get patent alerts
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