US2026071287A1PendingUtilityA1
Method of producing reduced iron
Est. expirySep 16, 2042(~16.1 yrs left)· nominal 20-yr term from priority
Inventors:HORITA KenyaHIGUCHI TAKAHIDEIWAMI YUJITAKEHARA KENTANAKAMURA NAOTOFUJIWARA SHOHEIMORITA YUYA
C22B 1/2406C22B 1/16C22B 1/245C22B 1/243C21B 13/12C21B 11/10C21B 13/008C21B 3/02
60
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Claims
Abstract
Provided is a method of producing reduced iron that can suppress clustering of iron ore pellets. The method of producing reduced iron ore includes: a pellet production process of mixing iron ore powder, binder, and auxiliary material, granulating to obtain green pellets, and then firing the green pellets to obtain iron ore pellets; and a reduction process of charging the iron ore pellets into a vertical shaft furnace and directly reducing the iron ore pellets via a reducing gas to obtain reduced iron pellets. Raw material of the iron ore powder includes iron ore having a composition in which total Fe content is 63 mass % or less and the sum of SiO2 and Al2O3 is 4 mass % or more. The reduced iron pellets satisfy the following Expression. (SiO2+Al2O3+CaO+MgO+FeO)/M.Fe≥0.15
Claims
exact text as granted — not AI-modified1 . A method of producing reduced iron ore, the method comprising:
a pellet production process of mixing iron ore powder, binder, and auxiliary material, granulating to obtain green pellets, and then firing the green pellets to obtain iron ore pellets; and a reduction process of charging the iron ore pellets into a vertical shaft furnace and directly reducing the iron ore pellets via a reducing gas to obtain reduced iron pellets, wherein, raw material of the iron ore powder includes iron ore having a composition in which total Fe content is 63 mass % or less and the sum of SiO 2 and Al 2 O 3 is 4 mass % or more, and the reduced iron pellets satisfy the following Expression (1)
(
SiO
2
+
Al
2
O
3
+
C
a
O
+
M
g
O
+
F
e
O
)
/
M
≥
0
.
1
5
(
1
)
where, in Expression (1), SiO 2 , Al 2 O 3 , CaO, and MgO are SiO 2 , Al 2 O 3 , CaO, and MgO content, in mass %, of the reduced iron pellets, FeO is residual iron oxide content, in mass %, of the reduced iron pellets, and M.Fe is metallic iron content, in mass %, of the reduced iron pellets.
2 . The method of producing reduced iron according to claim 1 , wherein one or both of (A) SiO 2 , Al 2 O 3 , CaO, and MgO content of the iron ore pellets and (B) metallization rate in the reduction process are intentionally set so that the reduced iron pellets satisfy Expression (1).
3 . The method of producing reduced iron according to claim 2 , wherein (B) is preset, and (A) is intentionally set so that the reduced iron pellets satisfy Expression (1).
4 . The method of producing reduced iron according to claim 2 , wherein the setting of (A) is performed by setting one or both of (A-1) composition of the iron ore powder and (A-2) type and content of the binder and the auxiliary material in the pellet production process.
5 . The method of producing reduced iron according to claim 4 , wherein (A-2) is preset, and (A-1) is intentionally set so that the reduced iron pellets satisfy Expression (1).
6 . The method of producing reduced iron according to claim 1 , wherein the metallization rate in the reduction process is set in a range from 88% to 96%.
7 . The method of producing reduced iron according to claim 1 , wherein temperature of the reducing gas in the reduction process is determined based on the value of the left side of Expression (1).
8 . The method of producing reduced iron according to claim 3 , wherein the setting of (A) is performed by setting one or both of (A-1) composition of the iron ore powder and (A-2) type and content of the binder and the auxiliary material in the pellet production process.
9 . The method of producing reduced iron according to claim 8 , wherein (A-2) is preset, and (A-1) is intentionally set so that the reduced iron pellets satisfy Expression (1).
10 . The method of producing reduced iron according to claim 2 , wherein the metallization rate in the reduction process is set in a range from 88% to 96%.
11 . The method of producing reduced iron according to claim 3 , wherein the metallization rate in the reduction process is set in a range from 88% to 96%.
12 . The method of producing reduced iron according to claim 4 , wherein the metallization rate in the reduction process is set in a range from 88% to 96%.
13 . The method of producing reduced iron according to claim 5 , wherein the metallization rate in the reduction process is set in a range from 88% to 96%.
14 . The method of producing reduced iron according to claim 8 , wherein the metallization rate in the reduction process is set in a range from 88% to 96%.
15 . The method of producing reduced iron according to claim 9 , wherein the metallization rate in the reduction process is set in a range from 88% to 96%.
16 . The method of producing reduced iron according to claim 2 , wherein temperature of the reducing gas in the reduction process is determined based on the value of the left side of Expression (1).
17 . The method of producing reduced iron according to claim 3 , wherein temperature of the reducing gas in the reduction process is determined based on the value of the left side of Expression (1).
18 . The method of producing reduced iron according to claim 4 , wherein temperature of the reducing gas in the reduction process is determined based on the value of the left side of Expression (1).
19 . The method of producing reduced iron according to claim 5 , wherein temperature of the reducing gas in the reduction process is determined based on the value of the left side of Expression (1).
20 . The method of producing reduced iron according to claim 8 , wherein temperature of the reducing gas in the reduction process is determined based on the value of the left side of Expression (1).Join the waitlist — get patent alerts
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