CA2849151C - Method of smelting vanadium titano-magnetite in blast-furnace - Google Patents
Method of smelting vanadium titano-magnetite in blast-furnace Download PDFInfo
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- CA2849151C CA2849151C CA2849151A CA2849151A CA2849151C CA 2849151 C CA2849151 C CA 2849151C CA 2849151 A CA2849151 A CA 2849151A CA 2849151 A CA2849151 A CA 2849151A CA 2849151 C CA2849151 C CA 2849151C
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- 238000000034 method Methods 0.000 title claims abstract description 40
- 238000003723 Smelting Methods 0.000 title claims abstract description 36
- 229910052720 vanadium Inorganic materials 0.000 title claims abstract description 35
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 title claims abstract description 35
- SZVJSHCCFOBDDC-UHFFFAOYSA-N iron(II,III) oxide Inorganic materials O=[Fe]O[Fe]O[Fe]=O SZVJSHCCFOBDDC-UHFFFAOYSA-N 0.000 title claims abstract description 29
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 88
- 229910052742 iron Inorganic materials 0.000 claims abstract description 43
- 239000000446 fuel Substances 0.000 claims abstract description 29
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 claims abstract description 28
- 239000010436 fluorite Substances 0.000 claims abstract description 28
- 239000000843 powder Substances 0.000 claims abstract description 26
- 238000007664 blowing Methods 0.000 claims abstract description 12
- 239000003245 coal Substances 0.000 claims description 31
- 239000012141 concentrate Substances 0.000 claims description 19
- GFNGCDBZVSLSFT-UHFFFAOYSA-N titanium vanadium Chemical compound [Ti].[V] GFNGCDBZVSLSFT-UHFFFAOYSA-N 0.000 claims description 19
- 239000008188 pellet Substances 0.000 claims description 11
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 8
- MRHSJWPXCLEHNI-UHFFFAOYSA-N [Ti].[V].[Fe] Chemical compound [Ti].[V].[Fe] MRHSJWPXCLEHNI-UHFFFAOYSA-N 0.000 claims description 8
- 229910052595 hematite Inorganic materials 0.000 claims description 8
- 239000011019 hematite Substances 0.000 claims description 8
- LIKBJVNGSGBSGK-UHFFFAOYSA-N iron(3+);oxygen(2-) Chemical group [O-2].[O-2].[O-2].[Fe+3].[Fe+3] LIKBJVNGSGBSGK-UHFFFAOYSA-N 0.000 claims description 8
- 239000012159 carrier gas Substances 0.000 claims description 6
- RHZUVFJBSILHOK-UHFFFAOYSA-N anthracen-1-ylmethanolate Chemical compound C1=CC=C2C=C3C(C[O-])=CC=CC3=CC2=C1 RHZUVFJBSILHOK-UHFFFAOYSA-N 0.000 claims description 5
- 239000003830 anthracite Substances 0.000 claims description 5
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 4
- 239000000203 mixture Substances 0.000 claims description 4
- 239000002802 bituminous coal Substances 0.000 claims description 3
- 239000003077 lignite Substances 0.000 claims description 3
- 238000005245 sintering Methods 0.000 claims description 3
- 238000001354 calcination Methods 0.000 claims description 2
- 239000000295 fuel oil Substances 0.000 claims description 2
- 239000003345 natural gas Substances 0.000 claims description 2
- 239000002994 raw material Substances 0.000 claims 1
- 239000002893 slag Substances 0.000 abstract description 27
- 230000003247 decreasing effect Effects 0.000 abstract description 5
- 239000000571 coke Substances 0.000 description 8
- 230000000052 comparative effect Effects 0.000 description 7
- 239000010936 titanium Substances 0.000 description 7
- 229910052719 titanium Inorganic materials 0.000 description 7
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 230000008018 melting Effects 0.000 description 4
- 238000002844 melting Methods 0.000 description 4
- 238000000926 separation method Methods 0.000 description 4
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N iron oxide Inorganic materials [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 2
- 150000003609 titanium compounds Chemical class 0.000 description 2
- 229910010061 TiC13 Inorganic materials 0.000 description 1
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000001174 ascending effect Effects 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000005587 bubbling Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000004939 coking Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- KMUONIBRACKNSN-UHFFFAOYSA-N potassium dichromate Substances [K+].[K+].[O-][Cr](=O)(=O)O[Cr]([O-])(=O)=O KMUONIBRACKNSN-UHFFFAOYSA-N 0.000 description 1
- 238000004448 titration Methods 0.000 description 1
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/10—Reduction of greenhouse gas [GHG] emissions
- Y02P10/143—Reduction of greenhouse gas [GHG] emissions of methane [CH4]
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- Manufacture Of Iron (AREA)
Abstract
The present invention discloses a method of smelting vanadium titano-magnetite in blast furnace, comprising: blowing fuel and fluorite powder into the blast furnace through a tuyere during smelting vanadium titano-magnetite in the blast furnace. With the method of smelting vanadium titano-magnetite in blast furnace disclosed in the present invention, the iron content in slag can be decreased significantly, and the total fuel ratio can be decreased.
Description
METHOD OF SMELTING VANADIUM TITANO-MAGNETITE IN BLAST-FURNACE
FIELD OF THE INVENTION
The present invention relates to a method of smelting vanadium titano-magnetite in blast-furnace.
BACKGROUND OF THE INVENTION
Presently, the existing method of smelting vanadium titano-magnetite in blast furnace usually comprises sintering vanadium-titanium iron concentrate and ordinary powder ore to prepare sintered ore, pelleting vanadium-titanium iron concentrate and ordinary iron concentrate to prepare pellet ore, feeding the sintered ore, pellet ore, and some lump ore in definite proportions with coke into a blast furnace, and blowing pulverized coal and bubbling air into the blast furnace through the tuyere of the blast furnace at the same time, so that the coke and the blowed pulverized coal burn and produce a reduction gas (mainly consists of CO and 112), which removes oxygen from the vanadium titano-magnetite when ascending in blast furnace, so that the vanadium titano-magnetite is reduced and obtain iron, and then the iron is melted and drips down to the furnace hearth; thus, iron is separated from slag and thereby the smelting process is completed.
However, the TiO2 content in the slag is high owing to the high content of titanium in the vanadium titano-magnetite, and may produce low-valent titanium compounds with high melting point (e.g., TiC, TiN and TiCN) if it is over-reduced. These low-valent titanium compounds are sbsorbed onto the small iron balls and the surface tension of the small iron balls are increased;
consequently, the small iron balls are difficult to merge and grow up, and finally a large quantity of dispersive small iron balls existed in the slag. Moreover, the higher the low-valent titanium content in the slag, the more the minerals with high melting point will be produced, resulting in increased slag melting temperature, increased slag viscosity, and increased difficulty in separation of iron from slag. These factors result in high iron content in the slag produced by smelting the vanadium titano-magnetite in blast furnace and thereby causes severe iron loss as high as 6-8wt%.
SUMMARY OF THE INVENTION
The present invention provides a new method of smelting vanadium titano-magnetite in blast furnace, to solve the problems of high melting temperature of high-titanium slag and difficulty in separation of iron from slag in the prior art.
To achieve the object, the present invention provides a method of smelting vanadium titano-magnetite in blast furnace, comprising: blowing fuel and fluorite powder into the blast furnace through a tuyere during smelting vanadium titano-magnetite in the blast furnace.
By blowing fuel and fluorite powder into the blast furnace through a tuyere, the method provided in the present invention improves utilization of fluorite powder and avoids occupation of useful space in the blast furnace and absorption of a great deal of heat incurred by lump fluorite added from furnace roof. The fluorite powder blown through the tuyere reacts with the vanadium-titanium slag directly, improves the properties of the slag and achieves better separation of iron from slag, so as to attain a purpose of reducing iron content in slag and decreasing fuel ratio.
Other characteristics and advantages of the present invention will be further detailed in the embodiments hereunder.
DETAILED DESCRIPTION OF THE EMBODIMENTS
Hereunder the embodiments of the present invention will be detailed, with reference to the accompanying drawings. It should be appreciated that the embodiments described here are only provided to describe and explain the present invention, but shall not be deemed as constituting any limitation to the present invention.
The present invention provides a method of smelting vanadium titano-magnetite in blast furnace, comprising: blowing fuel and fluorite powder to the blast furnace through a tuyere during smelting vanadium titano-magnetite in the blast furnace.
FIELD OF THE INVENTION
The present invention relates to a method of smelting vanadium titano-magnetite in blast-furnace.
BACKGROUND OF THE INVENTION
Presently, the existing method of smelting vanadium titano-magnetite in blast furnace usually comprises sintering vanadium-titanium iron concentrate and ordinary powder ore to prepare sintered ore, pelleting vanadium-titanium iron concentrate and ordinary iron concentrate to prepare pellet ore, feeding the sintered ore, pellet ore, and some lump ore in definite proportions with coke into a blast furnace, and blowing pulverized coal and bubbling air into the blast furnace through the tuyere of the blast furnace at the same time, so that the coke and the blowed pulverized coal burn and produce a reduction gas (mainly consists of CO and 112), which removes oxygen from the vanadium titano-magnetite when ascending in blast furnace, so that the vanadium titano-magnetite is reduced and obtain iron, and then the iron is melted and drips down to the furnace hearth; thus, iron is separated from slag and thereby the smelting process is completed.
However, the TiO2 content in the slag is high owing to the high content of titanium in the vanadium titano-magnetite, and may produce low-valent titanium compounds with high melting point (e.g., TiC, TiN and TiCN) if it is over-reduced. These low-valent titanium compounds are sbsorbed onto the small iron balls and the surface tension of the small iron balls are increased;
consequently, the small iron balls are difficult to merge and grow up, and finally a large quantity of dispersive small iron balls existed in the slag. Moreover, the higher the low-valent titanium content in the slag, the more the minerals with high melting point will be produced, resulting in increased slag melting temperature, increased slag viscosity, and increased difficulty in separation of iron from slag. These factors result in high iron content in the slag produced by smelting the vanadium titano-magnetite in blast furnace and thereby causes severe iron loss as high as 6-8wt%.
SUMMARY OF THE INVENTION
The present invention provides a new method of smelting vanadium titano-magnetite in blast furnace, to solve the problems of high melting temperature of high-titanium slag and difficulty in separation of iron from slag in the prior art.
To achieve the object, the present invention provides a method of smelting vanadium titano-magnetite in blast furnace, comprising: blowing fuel and fluorite powder into the blast furnace through a tuyere during smelting vanadium titano-magnetite in the blast furnace.
By blowing fuel and fluorite powder into the blast furnace through a tuyere, the method provided in the present invention improves utilization of fluorite powder and avoids occupation of useful space in the blast furnace and absorption of a great deal of heat incurred by lump fluorite added from furnace roof. The fluorite powder blown through the tuyere reacts with the vanadium-titanium slag directly, improves the properties of the slag and achieves better separation of iron from slag, so as to attain a purpose of reducing iron content in slag and decreasing fuel ratio.
Other characteristics and advantages of the present invention will be further detailed in the embodiments hereunder.
DETAILED DESCRIPTION OF THE EMBODIMENTS
Hereunder the embodiments of the present invention will be detailed, with reference to the accompanying drawings. It should be appreciated that the embodiments described here are only provided to describe and explain the present invention, but shall not be deemed as constituting any limitation to the present invention.
The present invention provides a method of smelting vanadium titano-magnetite in blast furnace, comprising: blowing fuel and fluorite powder to the blast furnace through a tuyere during smelting vanadium titano-magnetite in the blast furnace.
2 The inventor has found: the object of the present invention, i.e., improving slag properties and achieving better separation of iron from slag, can be achieved simply by blowing fuel and fluorite powder into the blast furnace through a tuyere. The fluorite powder is prepared from ordinary fluorite in the art. To achieve the object of the present invention better, the weight ratio of fuel to fluorite powder is preferably 1: (0.01-0.05), more preferably 1:
(0.02-0.04).
To achieve the object of the present invention better, the granularity of the fluorite powder is preferably smaller than 0.1mm, more preferably 0.05-0.08mm.
In the present invention, the granularity is represented by the mesh size of a screen mesh through which the particles of fluorite powder are screened.
In the method disclosed in the present invention, the fuel may be selected according to the actual situation of production. For example, the fuel may be natural gas, heavy oil, or pulverized coal, etc. Preferably, the fuel is pulverized coal. The granularity of the pulverized coal may be 50-1201.1m, preferably 60-10011m, more preferably 70-80 m. There is no special requirement for the type of the pulverized coal; for example, the pulverized coal may be prepared from at least one of anthracite coal, lean coal, bituminous coal, and brown coal.
In the method disclosed in the present invention, the carrier gas for blowing fuel and fluorite powder may be selected according to the actual situation of production. For example, the carrier gas may be compressed air. Preferably, the temperature of the compressed air is 10-25 C, and the pressure of the compressed air is 800-1,200kPa. In the present invention, the pressure refers to absolute pressure.
There is no special requirement for the vanadium titano-magnetite material, which is to say, the vanadium titano-magnetite material may be selected appropriately according to the requirement for blast-furnace smelting. Preferably, the vanadium titano-magnetite material contains vanadium-titanium sintered ore, vanadium-titanium pellet ore and lump ore, wherein, the vanadium-titanium sintered ore is obtained by sintering a mixture of vanadium-titanium iron concentrate and ordinary iron concentrate, the vanadium-titanium pellet ore is obtained by
(0.02-0.04).
To achieve the object of the present invention better, the granularity of the fluorite powder is preferably smaller than 0.1mm, more preferably 0.05-0.08mm.
In the present invention, the granularity is represented by the mesh size of a screen mesh through which the particles of fluorite powder are screened.
In the method disclosed in the present invention, the fuel may be selected according to the actual situation of production. For example, the fuel may be natural gas, heavy oil, or pulverized coal, etc. Preferably, the fuel is pulverized coal. The granularity of the pulverized coal may be 50-1201.1m, preferably 60-10011m, more preferably 70-80 m. There is no special requirement for the type of the pulverized coal; for example, the pulverized coal may be prepared from at least one of anthracite coal, lean coal, bituminous coal, and brown coal.
In the method disclosed in the present invention, the carrier gas for blowing fuel and fluorite powder may be selected according to the actual situation of production. For example, the carrier gas may be compressed air. Preferably, the temperature of the compressed air is 10-25 C, and the pressure of the compressed air is 800-1,200kPa. In the present invention, the pressure refers to absolute pressure.
There is no special requirement for the vanadium titano-magnetite material, which is to say, the vanadium titano-magnetite material may be selected appropriately according to the requirement for blast-furnace smelting. Preferably, the vanadium titano-magnetite material contains vanadium-titanium sintered ore, vanadium-titanium pellet ore and lump ore, wherein, the vanadium-titanium sintered ore is obtained by sintering a mixture of vanadium-titanium iron concentrate and ordinary iron concentrate, the vanadium-titanium pellet ore is obtained by
3 calcining vanadium-titanium iron concentrate or a mixture of vanadium-titanium iron concentrate and ordinary iron concentrate, the ordinary iron concentrate is iron concentrate without vanadium element and titanium element, and the lump ore is ordinary hematite lump ore.
More preferably, the vanadium titano-magnetite material contains 60-80wt%
vanadium-titanium sintered ore, 3-12wt% lump ore, and 5-35wt% vanadium-titanium pellet ore. In the present invention, the ordinary iron concentrate refers to iron concentrate without vanadium and titanium elements or contains trace of vanadium and titanium elements; the ordinary hematite lump ore refers to hematite lump ore without vanadium and titanium elements or contains trace of vanadium and titanium elements.
In the method disclosed in the present invention, there is no strict requirement for the smelting conditions of vanadium titano-magnetite in the blast furnace, which is to say, the conditions may be ordinary blast-furnace smelting conditions. Preferably, the smelting conditions include: the temperature of tuyere: 1,200-1,250 C, the pressure of furnace roof: 120-200kPa.
Hereunder the present invention will be further detailed in some examples.
In the following examples and comparative examples:
The vanadium-titanium sintered ore (TFe: 49-51 wt%, FeO: 7-8wt%, Ti02: 6-8wt%) is from Pangang Ironworks;
The ordinary hematite lump ore (TFe: 45-50wt%, FeO: 2-5wt%, Si02: 18-20wt%) is from Huili County;
The vanadium-titanium pellet ore (TFe: 53-55wt%, FeO: 1-2wt%, Ti02: 8-10wt%) is from Panzhihua Gangcheng Enterprise;
The coke (C: 80-82wt%, ash (A): 12.5-13.5%, Coke Strength after Reaction (CSR%): 58-60%) is from Pangang coking plant;
More preferably, the vanadium titano-magnetite material contains 60-80wt%
vanadium-titanium sintered ore, 3-12wt% lump ore, and 5-35wt% vanadium-titanium pellet ore. In the present invention, the ordinary iron concentrate refers to iron concentrate without vanadium and titanium elements or contains trace of vanadium and titanium elements; the ordinary hematite lump ore refers to hematite lump ore without vanadium and titanium elements or contains trace of vanadium and titanium elements.
In the method disclosed in the present invention, there is no strict requirement for the smelting conditions of vanadium titano-magnetite in the blast furnace, which is to say, the conditions may be ordinary blast-furnace smelting conditions. Preferably, the smelting conditions include: the temperature of tuyere: 1,200-1,250 C, the pressure of furnace roof: 120-200kPa.
Hereunder the present invention will be further detailed in some examples.
In the following examples and comparative examples:
The vanadium-titanium sintered ore (TFe: 49-51 wt%, FeO: 7-8wt%, Ti02: 6-8wt%) is from Pangang Ironworks;
The ordinary hematite lump ore (TFe: 45-50wt%, FeO: 2-5wt%, Si02: 18-20wt%) is from Huili County;
The vanadium-titanium pellet ore (TFe: 53-55wt%, FeO: 1-2wt%, Ti02: 8-10wt%) is from Panzhihua Gangcheng Enterprise;
The coke (C: 80-82wt%, ash (A): 12.5-13.5%, Coke Strength after Reaction (CSR%): 58-60%) is from Pangang coking plant;
4 =
The anthracite coal and lean coal are from the Mines Bureau in Panzhihua.
The Fe content in the slag obtained in the examples and comparative examples is measured with TiC13 reduction-potassium dichromate titration method;
The total fuel ratio in the examples and comparative examples is calculated with the following formula:
Total fuel ratio (kg/ton iron) = amount of the blown pulverized coal (kg/ton iron) + amount of the added coke (kg/ton iron).
Example 1 This example is used to describe the method of smelting vanadium titano-magnetite in blast furnace provided in the present invention.
70pbw(parts by weight) vanadium-titanium sintered ore, 8pbw ordinary hematite lump ore, 22pbw vanadium-titanium pellet ore, and coke are fed into a 1,200m3 blast furnace for smelting;
also pulverized coal (60wt% anthracite coal + 40wt% lean coal) at about 74um granularity and fluorite powder at 0.05mm granularity are blown into the blast furnace at a weight ratio of 1:0.03 through a tuyere, wherein, the carrier gas for blowing is compressed air, the temperature of the compressed air is 15 C and the pressure of the compressed air 900kPa.
The amount of blown pulverized coal is at about 120kg/ton iron. The temperature of the tuyere of blast-furnace (i.e., air temperature) is controlled at 1,220 C, and the pressure of furnace roof is controlled at 137kPa.
In the smelting process described above, the iron content in the produced slag and the total fuel ratio are shown in the following table 1.
The anthracite coal and lean coal are from the Mines Bureau in Panzhihua.
The Fe content in the slag obtained in the examples and comparative examples is measured with TiC13 reduction-potassium dichromate titration method;
The total fuel ratio in the examples and comparative examples is calculated with the following formula:
Total fuel ratio (kg/ton iron) = amount of the blown pulverized coal (kg/ton iron) + amount of the added coke (kg/ton iron).
Example 1 This example is used to describe the method of smelting vanadium titano-magnetite in blast furnace provided in the present invention.
70pbw(parts by weight) vanadium-titanium sintered ore, 8pbw ordinary hematite lump ore, 22pbw vanadium-titanium pellet ore, and coke are fed into a 1,200m3 blast furnace for smelting;
also pulverized coal (60wt% anthracite coal + 40wt% lean coal) at about 74um granularity and fluorite powder at 0.05mm granularity are blown into the blast furnace at a weight ratio of 1:0.03 through a tuyere, wherein, the carrier gas for blowing is compressed air, the temperature of the compressed air is 15 C and the pressure of the compressed air 900kPa.
The amount of blown pulverized coal is at about 120kg/ton iron. The temperature of the tuyere of blast-furnace (i.e., air temperature) is controlled at 1,220 C, and the pressure of furnace roof is controlled at 137kPa.
In the smelting process described above, the iron content in the produced slag and the total fuel ratio are shown in the following table 1.
5 =
Example 2 This example is used to describe the method of smelting vanadium titano-magnetite in blast furnace provided in the present invention.
70pbw vanadium-titanium sintered ore, 8pbw ordinary hematite lump ore, 22pbw vanadium-titanium pellet ore, and coke are fed into a 1,200m3 blast furnace for smelting; also pulverized coal (60wt% anthracite coal + 40wt% brown coal) at about 100p,m granularity and fluorite powder at 0.08mm granularity are blown into the blast furnace at a weight ratio of 1:0.04 through a tuyere, wherein, the carrier gas for blowing is compressed air, the temperature of the compressed air is 25 Cand the pressure of the compressed air is 1,200kPa.
The amount of blown pulverized coal is at about 120kg/ton iron. The temperature of the tuyere of blast-furnace (i.e., air temperature) is controlled at 1,250 C, and the pressure of furnace roof is controlled at 120kPa.
In the smelting process described above, the iron content in the produced slag and the total fuel ratio are shown in the following table 1.
Example 3 This example is used to describe the method of smelting vanadium titano-magnetite in blast furnace provided in the present invention.
70pbw vanadium-titanium sintered ore, 8pbw ordinary hematite lump ore, 22pbw vanadium-titanium pellet ore, and coke are fed into a 1,200m3 blast furnace for smelting; also pulverized coal (60wt% lean coal + 40wt% bituminous coal) at about 50pm granularity and fluorite powder at 0.09mm granularity are blown into the blast furnace at a weight ratio of 1:0.01 through a tuyere, wherein, the carrier gas for blowing is compressed air, the temperature of the compressed air is 10 Cand the pressure of the compressed air is 800kPa.
Example 2 This example is used to describe the method of smelting vanadium titano-magnetite in blast furnace provided in the present invention.
70pbw vanadium-titanium sintered ore, 8pbw ordinary hematite lump ore, 22pbw vanadium-titanium pellet ore, and coke are fed into a 1,200m3 blast furnace for smelting; also pulverized coal (60wt% anthracite coal + 40wt% brown coal) at about 100p,m granularity and fluorite powder at 0.08mm granularity are blown into the blast furnace at a weight ratio of 1:0.04 through a tuyere, wherein, the carrier gas for blowing is compressed air, the temperature of the compressed air is 25 Cand the pressure of the compressed air is 1,200kPa.
The amount of blown pulverized coal is at about 120kg/ton iron. The temperature of the tuyere of blast-furnace (i.e., air temperature) is controlled at 1,250 C, and the pressure of furnace roof is controlled at 120kPa.
In the smelting process described above, the iron content in the produced slag and the total fuel ratio are shown in the following table 1.
Example 3 This example is used to describe the method of smelting vanadium titano-magnetite in blast furnace provided in the present invention.
70pbw vanadium-titanium sintered ore, 8pbw ordinary hematite lump ore, 22pbw vanadium-titanium pellet ore, and coke are fed into a 1,200m3 blast furnace for smelting; also pulverized coal (60wt% lean coal + 40wt% bituminous coal) at about 50pm granularity and fluorite powder at 0.09mm granularity are blown into the blast furnace at a weight ratio of 1:0.01 through a tuyere, wherein, the carrier gas for blowing is compressed air, the temperature of the compressed air is 10 Cand the pressure of the compressed air is 800kPa.
6 =
=
=
The amount of blown pulverized coal is at about 120kg/ton iron. The temperature of tuyere of the blast-furnace (i.e., air temperature) is controlled at 1,200 C, and the pressure of furnace roof is controlled at 200kPa.
In the smelting process described above, the iron content in the produced slag and the total fuel ratio are shown in the following table 1.
Example 4 The method is the same with the method disclosed in example 1, but the granularity of the fluorite powder is 0.09mm, and the weight ratio of pulverized coal to fluorite powder is 1:0.05.
In the smelting process described above, the iron content in the produced slag and the total fuel ratio are shown in the following table 1.
Example 5 The method is the same with the method disclosed in example 1, but the granularity of the pulverized coal is 50 m, and the amount of blown pulverized coal is at about 140kg/ton iron.
The temperature of tuyere of the blast-furnace (i.e., air temperature) is controlled at 1,250 C, and the pressure of furnace roof is controlled at 125kPa.
In the smelting process described above, the iron content in the produced slag and the total fuel ratio are shown in the following table 1.
Comparative Example 1 The method is the same with the method disclosed in example 1, but no fluorite powder is blown through the tuyere.
In the smelting process described above, the iron content in the produced slag and the total fuel ratio are shown in the following table 1.
=
=
The amount of blown pulverized coal is at about 120kg/ton iron. The temperature of tuyere of the blast-furnace (i.e., air temperature) is controlled at 1,200 C, and the pressure of furnace roof is controlled at 200kPa.
In the smelting process described above, the iron content in the produced slag and the total fuel ratio are shown in the following table 1.
Example 4 The method is the same with the method disclosed in example 1, but the granularity of the fluorite powder is 0.09mm, and the weight ratio of pulverized coal to fluorite powder is 1:0.05.
In the smelting process described above, the iron content in the produced slag and the total fuel ratio are shown in the following table 1.
Example 5 The method is the same with the method disclosed in example 1, but the granularity of the pulverized coal is 50 m, and the amount of blown pulverized coal is at about 140kg/ton iron.
The temperature of tuyere of the blast-furnace (i.e., air temperature) is controlled at 1,250 C, and the pressure of furnace roof is controlled at 125kPa.
In the smelting process described above, the iron content in the produced slag and the total fuel ratio are shown in the following table 1.
Comparative Example 1 The method is the same with the method disclosed in example 1, but no fluorite powder is blown through the tuyere.
In the smelting process described above, the iron content in the produced slag and the total fuel ratio are shown in the following table 1.
7 Comparative Example 2 The method is the same with the method disclosed in example 2, but no fluorite powder is blown through the tuyere; instead, lump fluorite (at about. 10-40mm granularity) is fed into blast furnace from the furnace roof at an feeding rate of 8kg/ton Fe.
In the smelting process described above, the iron content in the produced slag and the total fuel ratio are shown in the following table 1.
Table 1 Total Fuel Ratio No. Iron Content in Slag (wt%) (Kg/ton iron) Example 1 2.7 560 Example 2 2.8 562 Example 3 3.4 569 Example 4 3.5 570 = Example 5 3.0 Comparative Example 1 4.5 580 Comparative Example 2 4.0 575 It can be seen from the above Table 1: with the method of smelting vanadium titano-magnetite in blast furnace disclosed in the present invention, the iron content in slag can be decreased significantly, and the total fuel ratio can be decreased.
In the smelting process described above, the iron content in the produced slag and the total fuel ratio are shown in the following table 1.
Table 1 Total Fuel Ratio No. Iron Content in Slag (wt%) (Kg/ton iron) Example 1 2.7 560 Example 2 2.8 562 Example 3 3.4 569 Example 4 3.5 570 = Example 5 3.0 Comparative Example 1 4.5 580 Comparative Example 2 4.0 575 It can be seen from the above Table 1: with the method of smelting vanadium titano-magnetite in blast furnace disclosed in the present invention, the iron content in slag can be decreased significantly, and the total fuel ratio can be decreased.
8
Claims (7)
1. A method of smelting vanadium titano-magnetite in a blast furnace consisting of the following steps: blowing fuel and fluorite powder into the blast furnace through a tuyere during smelting of the vanadium titano-magnetite in the blast furnace, a carrier gas for said blowing the fuel and fluorite powder into the blast furnace being compressed air having a temperature of 10-25°C and a pressure of 800-1,200kPa, a weight ratio of the fuel to the fluorite powder being 1:
(0.01-0.05) and the fluorite powder having a granularity of less than 0.1mm;
wherein conditions for smelting the vanadium titano-magnetite in the blast furnace include: the tuyere having a temperature of 1,200-1,250°C and a furnace roof of the blast furnace having a pressure of 120-200kPa.
(0.01-0.05) and the fluorite powder having a granularity of less than 0.1mm;
wherein conditions for smelting the vanadium titano-magnetite in the blast furnace include: the tuyere having a temperature of 1,200-1,250°C and a furnace roof of the blast furnace having a pressure of 120-200kPa.
2. The method according to claim 1, wherein the weight ratio of the fuel to the fluorite powder is 1: (0.02-0.04) and the granularity of the fluorite powder is 0.05-0.08mm.
3. The method according to claim 1, wherein the fuel is natural gas, heavy oil, or pulverized coal.
4. The method according to claim 3, wherein the fuel is the pulverized coal which is prepared from one or more of anthracite coal, lean coal, bituminous coal, and brown coal.
5. The method according to claim 4, wherein the granularity of the pulverized coal is 50-120µm.
6. The method according to claim 5, wherein the granularity of the pulverized coal is 60-100µm.
7. The method according to claim 1 or 2, wherein a raw material for smelting the vanadium titano-magnetite in the blast furnace contains vanadium-titanium sintered ore, vanadium-titanium pellet ore and lump ore, wherein the vanadium-titanium sintered ore is obtained by sintering a mixture of vanadium-titanium iron concentrate and ordinary iron concentrate, the vanadium-titanium pellet ore is obtained by calcining vanadium-titanium iron concentrate or a mixture of vanadium-titanium iron concentrate and ordinary iron concentrate, the ordinary iron concentrate is iron concentrate without vanadium element and titanium element, and the lump ore is hematite lump ore.
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| CN201310235017.0A CN104060007B (en) | 2013-06-14 | 2013-06-14 | A kind of method of vanadium titano-magnetite blast furnace process |
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| CN104673951B (en) * | 2015-03-20 | 2016-09-07 | 攀钢集团西昌钢钒有限公司 | Utilize the method that vanadium titanium two-phase sintering deposit carries out blast furnace process |
| CN104878143A (en) * | 2015-06-18 | 2015-09-02 | 攀钢集团攀枝花钢铁研究院有限公司 | Blast furnace smelting method of vanadium titano-magnetite |
| CN106191351A (en) * | 2016-08-31 | 2016-12-07 | 云南德胜钢铁有限公司 | A kind of method of blast furnace ironmaking |
| CN106755667A (en) * | 2016-11-10 | 2017-05-31 | 攀钢集团攀枝花钢铁研究院有限公司 | V-bearing titanomagnetite smelting coal dust additive and its application |
| CN107400774A (en) * | 2017-07-27 | 2017-11-28 | 山西太钢不锈钢股份有限公司 | A kind of method for improving blast furnace vanadium-titanium pellet intensity |
| CN107400745A (en) * | 2017-08-07 | 2017-11-28 | 攀钢集团攀枝花钢铁研究院有限公司 | A kind of smelting process of the iron ore concentrate containing vanadium, titanium and chromium |
| CN111455122B (en) * | 2020-05-08 | 2022-02-18 | 张岩 | Method for separating vanadium, titanium and iron from vanadium-titanium magnetite |
| CN114058751B (en) * | 2020-06-12 | 2022-11-01 | 武钢集团昆明钢铁股份有限公司 | Intensified smelting method for titanium slag in blast furnace |
| CN115814806B (en) * | 2021-11-12 | 2024-02-13 | 中国矿业大学 | Vanadium titano-magnetite-coke powder composite material and preparation method and application thereof |
| CN114686627B (en) * | 2022-04-08 | 2023-08-25 | 攀钢集团攀枝花钢铁研究院有限公司 | Blast furnace iron-making furnace burden of vanadium titano-magnetite and smelting method thereof |
| CN115491453B (en) * | 2022-08-23 | 2023-12-19 | 攀钢集团西昌钢钒有限公司 | PLCsmelt smelting reduction iron-making method and device |
| CN115418424A (en) * | 2022-09-29 | 2022-12-02 | 攀钢集团攀枝花钢铁研究院有限公司 | Blowing method for improving performance of high-titanium slag in schreyerite smelting |
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| CN101775451B (en) * | 2010-03-26 | 2012-07-04 | 中南大学 | Blast-furnace smelting method for vanadium titano-magnetite |
| CN101962696B (en) * | 2010-11-01 | 2012-06-13 | 河北钢铁股份有限公司承德分公司 | Method for blowing furnace washing agent by using air inlet of blast furnace |
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