CN111748703A - Method for extracting vanadium from high-silicon medium-vanadium molten iron by converter two-blowing two-pouring one-time slag tapping method - Google Patents
Method for extracting vanadium from high-silicon medium-vanadium molten iron by converter two-blowing two-pouring one-time slag tapping method Download PDFInfo
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 title claims abstract description 194
- 239000002893 slag Substances 0.000 title claims abstract description 159
- 229910052720 vanadium Inorganic materials 0.000 title claims abstract description 117
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 title claims abstract description 102
- 229910052742 iron Inorganic materials 0.000 title claims abstract description 85
- 238000007664 blowing Methods 0.000 title claims abstract description 81
- 229910052710 silicon Inorganic materials 0.000 title claims abstract description 75
- 239000010703 silicon Substances 0.000 title claims abstract description 60
- 238000000034 method Methods 0.000 title claims abstract description 57
- 238000010079 rubber tapping Methods 0.000 title claims abstract description 18
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 111
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 111
- 239000001301 oxygen Substances 0.000 claims abstract description 111
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 53
- 239000010959 steel Substances 0.000 claims abstract description 53
- 238000003723 Smelting Methods 0.000 claims abstract description 28
- 238000000605 extraction Methods 0.000 claims abstract description 23
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 29
- 239000012535 impurity Substances 0.000 claims description 22
- 239000000126 substance Substances 0.000 claims description 22
- 230000002829 reductive effect Effects 0.000 claims description 18
- 238000001816 cooling Methods 0.000 claims description 11
- 238000007599 discharging Methods 0.000 claims description 11
- GFNGCDBZVSLSFT-UHFFFAOYSA-N titanium vanadium Chemical compound [Ti].[V] GFNGCDBZVSLSFT-UHFFFAOYSA-N 0.000 claims description 8
- PNXOJQQRXBVKEX-UHFFFAOYSA-N iron vanadium Chemical compound [V].[Fe] PNXOJQQRXBVKEX-UHFFFAOYSA-N 0.000 claims description 6
- 229910052799 carbon Inorganic materials 0.000 claims description 3
- 229910052717 sulfur Inorganic materials 0.000 claims description 2
- 238000005272 metallurgy Methods 0.000 abstract description 3
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N iron oxide Inorganic materials [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 41
- 230000003647 oxidation Effects 0.000 description 16
- 238000007254 oxidation reaction Methods 0.000 description 16
- 238000005070 sampling Methods 0.000 description 6
- 238000006243 chemical reaction Methods 0.000 description 5
- CSJDCSCTVDEHRN-UHFFFAOYSA-N methane;molecular oxygen Chemical compound C.O=O CSJDCSCTVDEHRN-UHFFFAOYSA-N 0.000 description 5
- 230000001590 oxidative effect Effects 0.000 description 5
- 230000000630 rising effect Effects 0.000 description 5
- 238000005728 strengthening Methods 0.000 description 5
- 238000012546 transfer Methods 0.000 description 5
- 238000009529 body temperature measurement Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 230000005764 inhibitory process Effects 0.000 description 4
- XWHPIFXRKKHEKR-UHFFFAOYSA-N iron silicon Chemical compound [Si].[Fe] XWHPIFXRKKHEKR-UHFFFAOYSA-N 0.000 description 4
- SZVJSHCCFOBDDC-UHFFFAOYSA-N iron(II,III) oxide Inorganic materials O=[Fe]O[Fe]O[Fe]=O SZVJSHCCFOBDDC-UHFFFAOYSA-N 0.000 description 4
- 230000002035 prolonged effect Effects 0.000 description 4
- 238000009628 steelmaking Methods 0.000 description 4
- 241001062472 Stokellia anisodon Species 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- CYCSEDRJRMCANL-UHFFFAOYSA-N iron(5+) Chemical compound [Fe+5] CYCSEDRJRMCANL-UHFFFAOYSA-N 0.000 description 1
- 230000000670 limiting effect Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000036961 partial effect Effects 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B34/00—Obtaining refractory metals
- C22B34/20—Obtaining niobium, tantalum or vanadium
- C22B34/22—Obtaining vanadium
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B11/00—Making pig-iron other than in blast furnaces
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
- C21C5/30—Regulating or controlling the blowing
-
- 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
- Y02P10/20—Recycling
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Carbon Steel Or Casting Steel Manufacturing (AREA)
Abstract
The invention relates to a method for extracting vanadium from high-silicon medium-vanadium molten iron by a converter two-blowing two-pouring one-time slag tapping method, belonging to the technical field of metallurgy. The method comprises the steps of proportioning molten iron and scrap steel, carrying out primary oxygen supply, removing silicon and deslagging, carrying out secondary oxygen supply and vanadium extraction, controlling temperature and reducing the grade of FeO vanadium-retaining slag in the later period, and carrying out slag tapping. The method has the advantages of treating high-silicon vanadium-containing molten iron to extract vanadium, reducing residual vanadium in semisteel, improving the grade quality of vanadium slag and the like, so that the converter uses the high-silicon molten iron (more than 0.55wt% [ Si ] to improve the quality of vanadium slag]) In the vanadium extraction smelting process, the grade of the vanadium slag is improved from 7.8 percent to 10.1 percent on average, vanadium in molten iron is fully recovered, and [ SiO ] in the vanadium slag2]The control is 9.91-11.3%, and the method is easy to popularize and apply.
Description
Technical Field
The invention belongs to the technical field of metallurgy, and particularly relates to a method for extracting vanadium from high-silicon medium-vanadium molten iron by a converter two-blowing two-pouring one-time slag tapping method.
Background
The method is influenced by the continuous increase of the international iron ore price, inland iron and steel enterprises increase the use proportion of peripheral lean and impure ores, the resources of the peripheral vanadium-titanium magnetite in Yunnan are rich, and the development of blast furnace vanadium-titanium magnetite smelting and vanadium extraction and steel making become the optimal selection of steel enterprises. When the blast furnace adopts vanadium titano-magnetite which is difficult to smelt, the molten iron with the silicon content of more than 5 percent is high (Si) due to the influence of the structure of the ore, raw materials and the fluctuation of the furnace conditions]Greater than 0.55%) and vanadium extraction and steel making are not possible. In the conventional process of vanadium extraction and steel making by a converter, the oxidation of vanadium can be inhibited by the high silicon content of molten iron, and vanadium Slag (SiO) is contained in the molten iron2) The high content of the vanadium causes the problems of partial rare slag state, reduced quality grade of vanadium slag, high residual vanadium in semisteel, low slag yield and the like. Therefore, how to overcome the defects of the prior art is a problem which needs to be solved urgently in the technical field of metallurgy at present.
Disclosure of Invention
The invention aims to solve the defects of the prior art and provides a method for extracting vanadium from high-silicon medium-vanadium molten iron by a converter two-blowing two-dumping one-time deslagging method, which enables the converter to use high-silicon molten iron (> 0.55wt% [ Si ] to extract vanadium]) In the vanadium extraction smelting process, the grade of the vanadium slag is improved from 7.8 percent to 10.1 percent on average, and the vanadium Slag (SiO) is contained in the vanadium slag2) The control is carried out at 9.91-11.3%, vanadium in the molten iron is fully recovered, and the grade and quality of the vanadium slag are improved.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a method for extracting vanadium from high-silicon medium-vanadium molten iron by a converter two-blowing two-pouring one-time slag tapping method comprises the following steps:
A. proportioning molten iron and scrap steel: adding molten iron and scrap steel into an LD converter, controlling the temperature of the molten iron to be 1200-1250 ℃, and adjusting the charging proportion of the scrap steel in the converter to be less than 8%;
B. primary oxygen supply, silicon removal and slag removal: the oxygen supply flow is 6800-7500 m during 2.9-3.1 minutes before oxygen blowing smelting of the converter3Controlling the lance position to 1350-1500 mm, blowing oxygen for smelting for 2.4-2.6 minutes, then reducing the lance position to 400-500 mm, continuing blowing for the rest time, and then lifting the lance to pour out the initial-stage high-silicon slag;
C. secondary oxygen supply and vanadium extraction: after pouring out the initial high silicon slag, the converter is shaken up, the lance position is controlled to be 900-1200 mm, and the oxygen supply flow is controlled to be 6500-7000 m3Continuously supplying oxygen for blowing for 2.0-2.5 minutes to ensure that the furnace slag contains more than 70wt% of FeO, and adding 0-5 t of cooling vanadium-titanium balls to control the temperature in the furnace to be 1300-1350 ℃;
D. and (3) controlling the temperature and reducing the grade of the FeO vanadium-retaining slag in the later period: after vanadium is extracted by secondary oxygen supply, the lance position is reduced to 400-600 mm for blowing for 10-60 seconds, and the blowing end point temperature is controlled to be less than 1390 ℃;
E. deslagging: and pouring the vanadium slag into a slag basin in the semisteel discharging process.
Further, preferably, in the step a, the molten iron has the following chemical components: 3.8 to 4.5 weight percent of C, 0.55 to 0.73 weight percent of Si, 0.20 to 0.25 weight percent of V, 0.23 to 0.49 weight percent of Mn, 0.063 to 0.149 weight percent of P, less than or equal to 0.035 weight percent of S, and the balance of Fe and inevitable impurities.
Further, in the step A, the chemical composition of the scrap steel is preferably as follows: 0.12 to 0.30wt% of C, 0.20 to 0.50wt% of Si, 0.45 to 1.15wt% of Mn, 0.025 to 0.055wt% of P, 0.020 to 0.045wt% of S, and the balance of Fe and inevitable impurities.
Further, in the step C, the gun position is controlled in a high-medium-low mode at 1200-900 mm.
Further, preferably, in the step E, in the semisteel tapping process, a hot slag sample is taken after the furnace for analysis, and then the vanadium slag is poured into a special slag basin.
In the step A of the invention, the charging proportion of the scrap steel is less than 8 percent, and can be 0 percent.
In the step B, the remaining time is 2.9-3.1 minutes minus 2.4-2.6 minutes.
In the step C of the invention, when the gun position is controlled in a high-medium-low mode at 1200-900 mm, the operation is carried out according to the existing operation method, and the specific operation control mode is not limited by the invention.
Compared with the prior art, the invention has the beneficial effects that:
when the blast furnace adopts vanadium titano-magnetite which is difficult to smelt, the molten iron with the silicon content of more than 5 percent is high (Si) due to the influence of the structure of the ore, raw materials and the fluctuation of the furnace conditions]More than 0.55 percent), the problems of the conventional vanadium slag for vanadium extraction and steel making that the grade quality is reduced, the slag state is more dilute, the slag yield is low and the like can be caused, and about more than 5 percent of molten iron can not be subjected to vanadium extraction due to high silicon content. The method of the invention ensures that the converter uses high-silicon molten iron (more than 0.55wt% [ Si ]]) In the vanadium extraction smelting process, the grade of the vanadium slag is improved from 7.8 percent to 10.1 percent on average, vanadium in molten iron is fully recovered, and [ SiO ] in the vanadium slag2]Controlling the temperature to be 9.91-11.3%;
the method has the advantages of treating high-silicon vanadium-containing molten iron to extract vanadium, reducing residual vanadium in semisteel, improving the grade and quality of vanadium slag and the like, and is easy to popularize and apply.
Detailed Description
The present invention will be described in further detail with reference to examples.
It will be appreciated by those skilled in the art that the following examples are illustrative of the invention only and should not be taken as limiting the scope of the invention. The examples do not specify particular techniques or conditions, and are performed according to the techniques or conditions described in the literature in the art or according to the product specifications. The materials or equipment used are not indicated by manufacturers, and all are conventional products available by purchase.
Example 1
A method for extracting vanadium from high-silicon medium-vanadium molten iron by a converter two-blowing two-pouring one-time slag tapping method comprises the following steps:
A. proportioning molten iron and scrap steel: adding molten iron and scrap steel into an LD converter, controlling the temperature of the molten iron to be 1200 ℃, and adjusting the charging proportion of the scrap steel of the converter to be 0%;
B. primary oxygen supply, silicon removal and slag removal: the oxygen supply flow is 6800m during the 2.9 minutes before oxygen blowing smelting of the converter3Controlling the gun position to 1350mm, blowing oxygen for smelting for 2.4 minutes, then reducing the gun position to 400mm, continuing blowing for the rest time, and then lifting the gun to pour out the initial high-silicon slag;
C. secondary oxygen supply and vanadium extraction: after pouring out the initial high silicon slag, the converter is rotated, the lance position is controlled to be 900-1200 mm, and the oxygen supply flow is controlled to be 6500m3Continuously supplying oxygen for blowing for 2.0 minutes to ensure that the furnace slag contains more than 70wt% of FeO, and adding 0t of cooling vanadium-titanium balls to control the temperature in the furnace to be 1300-1350 ℃;
D. and (3) controlling the temperature and reducing the grade of the FeO vanadium-retaining slag in the later period: after vanadium is extracted by secondary oxygen supply, the lance position is reduced to 500mm for blowing for 10 seconds, and the blowing end temperature is controlled to be less than 1390 ℃;
E. deslagging: and pouring the vanadium slag into a slag basin in the semisteel discharging process.
Example 2
A method for extracting vanadium from high-silicon medium-vanadium molten iron by a converter two-blowing two-pouring one-time slag tapping method comprises the following steps:
A. proportioning molten iron and scrap steel: adding molten iron and scrap steel into an LD converter, controlling the temperature of the molten iron to be 1250 ℃, and adjusting the charging proportion of the scrap steel into the converter to be 2%;
B. primary oxygen supply, silicon removal and slag removal: oxygen supply flow rate of 7500m 3.1 min before oxygen blowing smelting of converter3Controlling the lance position to be 1500mm, blowing oxygen for smelting for 2.6 minutes, then reducing the lance position to be 500mm, continuing blowing for the rest time, and then lifting the lance to pour out the initial-stage high-silicon slag;
C. secondary oxygen supply and vanadium extraction: after pouring out the initial high silicon slag, the converter is shaken up, the lance position is controlled to be 900-1200 mm, and the oxygen supply flow is controlled to be 7000m3Continuously supplying oxygen for blowing for 2.5 minutes to ensure that the furnace slag contains more than 70wt% of FeO, and adding 5t of cooling vanadium-titanium balls to control the temperature in the furnace to be 1300-1350 ℃;
D. and (3) controlling the temperature and reducing the grade of the FeO vanadium-retaining slag in the later period: after vanadium is extracted by secondary oxygen supply, the lance position is reduced to 600mm for blowing for 60 seconds, and the blowing end temperature is controlled to be less than 1390 ℃;
E. deslagging: and in the semi-steel discharging process, a hot slag sample is taken at the back of the furnace for analysis, and then the vanadium slag is poured into a special slag basin.
In the step A, the molten iron comprises the following chemical components: 3.8wt% of C, 0.55wt% of Si, 0.20wt% of V, 0.23wt% of Mn0, 0.063wt% of P0.015wt% of S0, and the balance of Fe and inevitable impurities.
The chemical components of the scrap steel are as follows: 0.12wt% of C, 0.20wt% of Si, 0.45wt% of Mn, 0.025wt% of P, 0.020wt% of S, and the balance of Fe and inevitable impurities.
And in the step C, controlling the gun position at 1200-900 mm by adopting a 'high-medium-low' mode.
Example 3
A method for extracting vanadium from high-silicon medium-vanadium molten iron by a converter two-blowing two-pouring one-time slag tapping method comprises the following steps:
A. proportioning molten iron and scrap steel: adding molten iron and scrap steel into an LD converter, controlling the temperature of the molten iron to be 1220 ℃, and adjusting the charging proportion of the scrap steel of the converter to be 7%;
B. primary oxygen supply, silicon removal and slag removal: oxygen supply flow of 7000m during the period of 3 minutes before oxygen blowing smelting of the converter3Controlling the lance position to 1400mm, blowing oxygen for smelting for 2.5 minutes, then reducing the lance position to 450mm, continuing blowing for the rest time, and then lifting the lance to pour out the initial high-silicon slag;
C. secondary oxygen supply and vanadium extraction: after pouring out the initial high-silicon slag, the converter is rotated, the lance position is controlled to be 900-1200 mm, and the oxygen supply flow is controlled to be 6800m3Continuously supplying oxygen for blowing for 2.3 minutes to ensure that the furnace slag contains more than 70wt% of FeO, and adding cooling vanadium-titanium 2t to control the temperature in the furnace to be 1300-1350 ℃;
D. and (3) controlling the temperature and reducing the grade of the FeO vanadium-retaining slag in the later period: after vanadium is extracted by secondary oxygen supply, the lance position is reduced to 400mm for blowing for 30 seconds, and the blowing end temperature is controlled to be less than 1390 ℃;
E. deslagging: and in the semi-steel discharging process, a hot slag sample is taken at the back of the furnace for analysis, and then the vanadium slag is poured into a special slag basin.
In the step A, the molten iron comprises the following chemical components: 4.5wt% of C, 0.73wt% of Si, 0.25wt% of V, 0.49wt% of Mn0, 0.149wt% of P, 0.021wt% of S, and the balance of Fe and inevitable impurities.
The chemical components of the scrap steel are as follows: 0.30wt% of C, 0.50wt% of Si, 1.15wt% of Mn1, 0.055wt% of P0.045wt% of S0.045wt% of Fe and inevitable impurities as the rest.
And in the step C, controlling the gun position at 1200-900 mm by adopting a 'high-medium-low' mode.
Example 4
A method for extracting vanadium from high-silicon medium-vanadium molten iron by a converter two-blowing two-pouring one-time slag tapping method comprises the following steps:
A. proportioning molten iron and scrap steel: adding molten iron and scrap steel into an LD converter, controlling the temperature of the molten iron to be 1230 ℃, and adjusting the charging proportion of the scrap steel in the converter to be 6%;
B. primary oxygen supply, silicon removal and slag removal: the oxygen flow rate is 7200m during 2.95 minutes before oxygen blowing smelting of the converter3Controlling the lance position to 1450mm, blowing oxygen for smelting for 2.48 minutes, then reducing the lance position to 430mm, continuing to blow for the rest time, and taking out the lance to pour out the initial-stage high-silicon slag;
C. secondary oxygen supply and vanadium extraction: after pouring out the initial high-silicon slag, the converter is rotated, the lance position is controlled to be 900-1200 mm, and the oxygen supply flow is controlled to be 6800m3Continuously supplying oxygen for blowing for 2.2 minutes to ensure that the furnace slag contains more than 70wt% of FeO, and adding 1.5t of cooling vanadium-titanium balls to control the temperature in the furnace to be 1300-1350 ℃;
D. and (3) controlling the temperature and reducing the grade of the FeO vanadium-retaining slag in the later period: after vanadium is extracted by secondary oxygen supply, the lance position is reduced to 550mm for converting for 45 seconds, and the converting end point temperature is controlled to be less than 1390 ℃;
E. deslagging: and in the semi-steel discharging process, a hot slag sample is taken at the back of the furnace for analysis, and then the vanadium slag is poured into a special slag basin.
In the step A, the molten iron comprises the following chemical components: c4 wt%, Si 0.6wt%, V0.22 wt%, Mn0.4wt%, P0.1 wt%, S0.030wt%, and the balance Fe and inevitable impurities.
The chemical components of the scrap steel are as follows: 0.18wt% of C, 0.4wt% of Si, 1wt% of Mn, 0.04wt% of P, 0.035wt% of S, and the balance of Fe and inevitable impurities.
And in the step C, controlling the gun position at 1200-900 mm by adopting a 'high-medium-low' mode.
Application example 1
A. Proportioning molten iron and scrap steel: 50.3t of molten iron (chemical components C4.23 wt%, Si 0.59wt%, V0.24 wt%, Mn0.31wt%, P0.089 wt%, S0.021wt%, and the balance Fe and inevitable impurities) and 4.1t of scrap steel (chemical components C0.14wt%, Si 0.20wt%, Mn 0.61wt%, P0.025 wt%, S0.045wt%, and the balance Fe and inevitable impurities) were charged into an LD converter, and the charging ratio of the scrap steel in the converter was adjusted to 7.5% according to the temperature of the molten iron (1227 ℃).
B. Primary oxygen supply, silicon removal and slag removal: oxygen blowing smelting in a converter with oxygen supply flow of 7000m3Controlling the lance position to 1400mm, blowing oxygen for smelting for 2.5 minutes, utilizing the inhibition oxidation effect of the initial molten iron silicon height on the molten iron vanadium, and increasing the lance position to increase [ FeO ] in the furnace]The content of [ FeO ] is fully utilized]And the dynamic and thermodynamic conditions of oxygen jet direct oxygen transfer, preferentially oxidizing to remove [ Si ] in the molten iron]Then lowering the lance position to 400mm, continuing blowing for 26 seconds, lifting the lance to pour out the initial high Silicon (SiO)2) Slag, low lance position strengthening desiliconization and reducing FeO in slag]And iron loss is reduced.
C. Secondary oxygen supply and vanadium extraction: after pouring out the initial high silicon slag, the converter is rotated to be upright, the lance position is controlled to be 900mm, and the oxygen supply flow is controlled to be 6800m3Continuously supplying oxygen for blowing for 2.4 minutes at a speed of 900-1200 mm, and controlling the lance position in a high-medium-low mode to ensure that a certain amount of FeO is in the furnace]And (4) content. With the gradual rise of the temperature of the molten pool, V in the molten iron]The oxidation speed is gradually accelerated, cooling balls are added into the furnace in 3 batches for 2.3t according to the temperature condition in the furnace, the temperature is controlled, the blowing is stably carried out, the temperature is prevented from rising too fast, the temperature in the furnace is controlled to be 1300-1350 ℃, and the [ V ] in a molten pool is prolonged]And the oxidation time is sufficient to reduce the residual vanadium in the semisteel.
D. Late stage temperature control and reduction [ FeO]Grade of vanadium-retaining slag: after vanadium extraction by secondary oxygen supply, the lance position is reduced to 400mm for blowing for 54 seconds (the oxygen supply time is adjusted according to the temperature condition in the furnace), and the phenomenon that carbon-oxygen reaction in the molten pool explodes to form slag (V)2O5) Reducing into molten pool, operating at low lance position while reducing FeO in slag]Then, the gun is lifted and the furnace is turned over for temperature measurement, and the end temperature is 1388 ℃.
E. And (6) deslagging. Tapping semisteelIn the process, a hot slag sample is taken from the rear of the furnace for analysis, and then the vanadium slag is poured into a special slag basin. Slag sampling: grade of vanadium slag (V)2O5) 9.21% in Slag (SiO)2)10.27%。
Application example 2
A. Proportioning molten iron and scrap steel: 50.5t of molten iron (chemical components C3.80 wt%, Si 0.57wt%, V0.25 wt%, Mn0.33wt%, P0.095 wt%, S0.030wt%, and the balance Fe and inevitable impurities) and 3.9t of scrap steel (chemical components C0.12wt%, Si 0.17wt%, Mn 0.66wt%, P0.027 wt%, S0.020wt%, and the balance Fe and inevitable impurities) were charged into an LD converter, and the charging ratio of the scrap steel in the converter was adjusted to 7.2% according to the temperature of the molten iron (1219 ℃).
B. Primary oxygen supply, silicon removal and slag removal: the oxygen supply flow is 6800m during the oxygen blowing smelting of the converter for 0 to 3.0 minutes3Controlling the lance position to 1400mm, blowing oxygen for smelting for 2.5 minutes, utilizing the inhibition oxidation effect of the initial molten iron silicon height on the molten iron vanadium, and increasing the lance position to increase [ FeO ] in the furnace]The content of [ FeO ] is fully utilized]And the dynamic and thermodynamic conditions of oxygen jet direct oxygen transfer, preferentially oxidizing to remove [ Si ] in the molten iron]Then, the lance position is lowered to 400mm, blowing is continued for 30 seconds, and then the lance is lifted out to pour out the initial high Silicon (SiO)2) Slag, low lance position strengthening desiliconization and reducing FeO in slag]And iron loss is reduced.
C. Secondary oxygen supply and vanadium extraction: after pouring out the initial high silicon slag, the converter is rotated, the lance position is controlled to be 1000mm, and the oxygen supply flow is controlled to be 6500m3Continuously supplying oxygen for blowing for 2.5 minutes at a speed of 900-1200 mm, and controlling the lance position in a high-medium-low mode to ensure that a certain amount of FeO is in the furnace]And (4) content. With the gradual rise of the temperature of the molten pool, V in the molten iron]The oxidation speed is gradually accelerated, cooling balls are added in 3 batches for 1.8t according to the temperature condition in the furnace, the temperature is controlled and the blowing is stably carried out, the temperature is prevented from rising too fast, the temperature in the furnace is controlled to be 1300-1350 ℃, so that the [ V ] in a molten pool is prolonged]And the oxidation time is sufficient to reduce the residual vanadium in the semisteel.
D. Late stage temperature control and reduction [ FeO]Grade of vanadium-retaining slag: after vanadium is extracted by secondary oxygen supply, the lance position is reduced to 400mm for blowing for 10 seconds (the oxygen supply time is adjusted according to the temperature condition in the furnace), and the phenomenon that carbon-oxygen reaction in a molten pool explodes to form slag (V)2O5) Reducing into molten pool, operating at low lance position while reducing FeO in slag]Then, the gun is lifted and the furnace is turned over to measure the temperature, and the end temperature is 1379 ℃.
E. And (6) deslagging. And in the semi-steel discharging process, a hot slag sample is taken at the back of the furnace for analysis, and then the vanadium slag is poured into a special slag basin. Slag sampling: grade of vanadium slag (V)2O5) 9.72% in Slag (SiO)2)11.3%。
Application example 3
A. Proportioning molten iron and scrap steel: 51.2t of molten iron (chemical components C4.50 wt%, Si 0.61wt%, V0.25 wt%, Mn0.49wt%, P0.063wt%, S0.030wt%, and the balance Fe and inevitable impurities) and 3.6t of scrap steel (chemical components C0.40wt%, Si 0.21wt%, Mn 0.59wt%, P0.055wt%, S0.029 wt%, and the balance Fe and inevitable impurities) were charged into an LD converter, and the charging ratio of the scrap steel in the converter was adjusted to 6.6% according to the temperature of the molten iron (1200 ℃).
B. Primary oxygen supply, silicon removal and slag removal: oxygen blowing smelting in a converter with oxygen supply flow of 7500m3Controlling the lance position to be 1500mm, blowing oxygen for smelting for 2.5 minutes, utilizing the inhibition oxidation effect of the initial molten iron silicon height on the molten iron vanadium, and increasing the lance position to improve [ FeO ] in the furnace]The content of [ FeO ] is fully utilized]And the dynamic and thermodynamic conditions of oxygen jet direct oxygen transfer, preferentially oxidizing to remove [ Si ] in the molten iron]Then, the lance position is lowered to 450mm, blowing is continued for 21 seconds, and then the lance is lifted out to pour out the initial high Silicon (SiO)2) Slag, low lance position strengthening desiliconization and reducing FeO in slag]And iron loss is reduced.
C. Secondary oxygen supply and vanadium extraction: after pouring out the initial high silicon slag, the converter is rotated to control the lance position to be 1200mm and the oxygen supply flow to be 7000m3Continuously supplying oxygen for blowing for 2.0 minutes per hour, controlling the lance position to be 900-1200 mm, and controlling the lance position in a high-medium-low mode to ensure that a certain amount of FeO is in the furnace]And (4) content. With the gradual rise of the temperature of the molten pool, V in the molten iron]The oxidation speed is gradually accelerated, cooling balls are added in 3 batches for 2.5t according to the temperature condition in the furnace, the temperature is controlled and the blowing is stably carried out, the temperature is prevented from rising too fast, the temperature in the furnace is controlled to be 1300-1350 ℃, so that the [ V ] in a molten pool is prolonged]And the oxidation time is sufficient to reduce the residual vanadium in the semisteel.
D. Late stage temperature control and reduction [ FeO]Grade of vanadium-retaining slag: after secondary oxygen supply and vanadium extractionReducing the lance position to 600mm for blowing for 49 seconds (adjusting oxygen supply time according to the temperature condition in the furnace), and preventing the carbon-oxygen reaction in the molten pool from exploding to form slag (V)2O5) Reducing into molten pool, operating at low lance position while reducing FeO in slag]Then, the gun is lifted and the furnace is turned over to measure the temperature, and the end temperature is 1376 ℃.
E. And (6) deslagging. And in the semi-steel discharging process, a hot slag sample is taken at the back of the furnace for analysis, and then the vanadium slag is poured into a special slag basin. Slag sampling: grade of vanadium slag (V)2O5) 10.32% in Slag (SiO)2)11.27%。
Application example 4
A. Proportioning molten iron and scrap steel: 51.2t of molten iron (chemical components C3.97 wt%, Si 0.73wt%, V0.20 wt%, Mn0.33wt%, P0.092 wt%, S0.026 wt%, and the balance Fe and inevitable impurities) and 3.5t of scrap steel (chemical components C0.15wt%, Si 0.50wt%, Mn1.15wt%, P0.045 wt%, S0.025 wt%, and the balance Fe and inevitable impurities) are added into an LD converter, and the charging ratio of the scrap steel of the converter is adjusted to 6.4% according to the temperature of the molten iron (1219 ℃).
B. Primary oxygen supply, silicon removal and slag removal: oxygen supply flow of 7100m during oxygen blowing smelting of the converter for 0-3.0 minutes3Controlling the lance position to 1400mm, blowing oxygen for smelting for 2.5 minutes, utilizing the inhibition oxidation effect of the initial molten iron silicon height on the molten iron vanadium, and increasing the lance position to increase [ FeO ] in the furnace]The content of [ FeO ] is fully utilized]And the dynamic and thermodynamic conditions of oxygen jet direct oxygen transfer, preferentially oxidizing to remove [ Si ] in the molten iron]Then, the lance position is lowered to 500mm, blowing is continued for 30 seconds, and then the lance is lifted out to pour out the initial high Silicon (SiO)2) Slag, low lance position strengthening desiliconization and reducing FeO in slag]And iron loss is reduced.
C. Secondary oxygen supply and vanadium extraction: after pouring out the initial high silicon slag, the converter is shaken up, the lance position is controlled to be 900-1200 mm, and the oxygen supply flow is controlled to be 6700m3Continuously supplying oxygen for blowing for 2.5 minutes at a speed of 900-1200 mm, and controlling the lance position in a high-medium-low mode to ensure that a certain amount of FeO is in the furnace]And (4) content. With the gradual rise of the temperature of the molten pool, V in the molten iron]The oxidation speed is gradually accelerated, the cooling balls are added in 3 batches for 1.8t according to the temperature condition in the furnace, the temperature control and the blowing are stably carried out, the temperature is prevented from rising too fast, and the temperature in the furnace is controlledThe temperature is 1300-1350 ℃ to prolong the [ V ] in the molten pool]And the oxidation time is sufficient to reduce the residual vanadium in the semisteel.
D. Late stage temperature control and reduction [ FeO]Grade of vanadium-retaining slag: after vanadium extraction by secondary oxygen supply, the lance position is reduced to 400mm for blowing for 49 seconds (the oxygen supply time is adjusted according to the temperature condition in the furnace), and the phenomenon that carbon-oxygen reaction in the molten pool explodes to form slag (V)2O5) Reducing into molten pool, operating at low lance position while reducing FeO in slag]Then, the gun is lifted and the furnace is turned over for temperature measurement, and the end temperature is 1382 ℃.
E. And (6) deslagging. And in the semi-steel discharging process, a hot slag sample is taken at the back of the furnace for analysis, and then the vanadium slag is poured into a special slag basin. Slag sampling: grade of vanadium slag (V)2O5) 11.23% in Slag (SiO)2)9.91%。
Application example 5
A. Proportioning molten iron and scrap steel: 50.8t of molten iron (chemical components C4.11 wt%, Si 0.57wt%, V0.25 wt%, Mn0.23wt%, P0.149 wt%, S0.030wt%, and the balance Fe and inevitable impurities) and 4.0t of scrap steel (chemical components C0.1697 wt%, Si 0.18wt%, Mn 0.45wt%, P0.033 wt%, S0.019 wt%, and the balance Fe and inevitable impurities) were charged into an LD converter, and the charging ratio of the scrap steel in the converter was adjusted to 7.3% according to the temperature of the molten iron (1250 ℃).
B. Primary oxygen supply, silicon removal and slag removal: oxygen supply flow rate of 6900m during oxygen blowing smelting of the converter for 0-3.0 minutes3Controlling the gun position to 1350mm for oxygen blowing smelting for 2.5 min, and increasing the position of the gun to increase the FeO in the furnace by utilizing the oxidation inhibiting effect of the silicon height of the initial molten iron on the vanadium content of the molten iron]The content of [ FeO ] is fully utilized]And the dynamic and thermodynamic conditions of oxygen jet direct oxygen transfer, preferentially oxidizing to remove [ Si ] in the molten iron]Then, the lance position is lowered to 450mm, blowing is continued for 30 seconds, and then the lance is lifted out to pour out the initial high Silicon (SiO)2) Slag, low lance position strengthening desiliconization and reducing FeO in slag]And iron loss is reduced.
C. Secondary oxygen supply and vanadium extraction: after pouring out the initial high-silicon slag, the converter is rotated, the lance position is controlled to be 900-1200 mm, and the oxygen supply flow is controlled to be 6800m3Continuously supplying oxygen for blowing for 2.3 minutes per hour, controlling the lance position to be 900-1200 mm, and controlling the lance position in a high-medium-low mode to ensure that a certain amount of FeO is in the furnace]And (4) content. With progressive bath temperatureRising, in the molten iron [ V ]]The oxidation speed is gradually accelerated, cooling balls are added in 3 batches for 2.5t according to the temperature condition in the furnace, the temperature is controlled and the blowing is stably carried out, the temperature is prevented from rising too fast, the temperature in the furnace is controlled to be 1300-1350 ℃, so that the [ V ] in a molten pool is prolonged]And the oxidation time is sufficient to reduce the residual vanadium in the semisteel.
D. Late stage temperature control and reduction [ FeO]Grade of vanadium-retaining slag: after vanadium extraction by secondary oxygen supply, the lance position is reduced to 400mm for blowing for 60 seconds (the oxygen supply time is adjusted according to the temperature condition in the furnace), and the phenomenon that carbon and oxygen in the molten pool react and explode to form slag (V) is prevented2O5) Reducing into molten pool, operating at low lance position while reducing FeO in slag]Then, the gun is lifted and the furnace is turned over for temperature measurement, and the end temperature is 1389 ℃.
E. And (6) deslagging. And in the semi-steel discharging process, a hot slag sample is taken at the back of the furnace for analysis, and then the vanadium slag is poured into a special slag basin. Slag sampling: grade of vanadium slag (V)2O5) 9.92% in Slag (SiO)2)10.31%。
Comparative example 1: in the process, the operations of supplying oxygen once and removing high-silicon slag once in the step B and the step C are omitted, and the grade of the vanadium slag is greatly reduced.
A. Proportioning molten iron and scrap steel: 50.2 t of molten iron (chemical components C4.20 wt%, Si 0.56wt%, V0.25 wt%, Mn0.41wt%, P0.073 wt%, S0.033 wt%, and the balance Fe and inevitable impurities) and 4.6t of scrap steel (chemical components C0.15wt%, Si 0.47wt%, Mn0.49wt%, P0.033 wt%, S0.029 wt%, and the balance Fe and inevitable impurities) were charged into an LD converter, and the charging ratio of the scrap steel in the converter was adjusted to 8.4% according to the molten iron temperature (1231 ℃).
B. Oxygen supply flow of 7800m during oxygen blowing smelting of the converter for 0-4.0 minutes3Controlling the lance position to 1400mm for oxygen blowing smelting for 4.0 minutes, reducing the lance position to 600mm for blowing for 49 seconds (adjusting oxygen supply time according to the temperature condition in the furnace), and preventing the carbon-oxygen reaction explosion in the molten pool from generating slag (V)2O5) Reducing into molten pool, operating at low lance position while reducing FeO in slag]Then, the gun is lifted and the furnace is turned over for temperature measurement, and the end temperature is 1381 ℃.
C. And (5) deslagging and analyzing. And in the semi-steel discharging process, a hot slag sample is taken at the back of the furnace for analysis, and then the vanadium slag is poured into a special slag basin. Slag sampling: vanadium oxideSlag grade (V)2O5) 5.32% in Slag (SiO)2)24.31%。
The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (5)
1. A method for extracting vanadium from high-silicon medium-vanadium molten iron by a converter two-blowing two-pouring one-time slag tapping method is characterized by comprising the following steps:
A. proportioning molten iron and scrap steel: adding molten iron and scrap steel into an LD converter, controlling the temperature of the molten iron to be 1200-1250 ℃, and adjusting the charging proportion of the scrap steel in the converter to be less than 8%;
B. primary oxygen supply, silicon removal and slag removal: the oxygen supply flow is 6800-7500 m during 2.9-3.1 minutes before oxygen blowing smelting of the converter3Controlling the lance position to 1350-1500 mm, blowing oxygen for smelting for 2.4-2.6 minutes, then reducing the lance position to 400-500 mm, continuing blowing for the rest time, and then lifting the lance to pour out the initial-stage high-silicon slag;
C. secondary oxygen supply and vanadium extraction: after pouring out the initial high silicon slag, the converter is shaken up, the lance position is controlled to be 900-1200 mm, and the oxygen supply flow is controlled to be 6500-7000 m3Continuously supplying oxygen for blowing for 2.0-2.5 minutes to ensure that the furnace slag contains more than 70wt% of FeO, and adding 0-5 t of cooling vanadium-titanium balls to control the temperature in the furnace to be 1300-1350 ℃;
D. and (3) controlling the temperature and reducing the grade of the FeO vanadium-retaining slag in the later period: after vanadium is extracted by secondary oxygen supply, the lance position is reduced to 400-600 mm for blowing for 10-60 seconds, and the blowing end point temperature is controlled to be less than 1390 ℃;
E. deslagging: and pouring the vanadium slag into a slag basin in the semisteel discharging process.
2. The method for extracting vanadium from high-silicon molten vanadium iron by using a converter two-blowing two-dumping slag tapping method according to claim 1, wherein in the step A, the molten iron comprises the following chemical components: 3.8 to 4.5 weight percent of C, 0.55 to 0.73 weight percent of Si, 0.20 to 0.25 weight percent of V, 0.23 to 0.49 weight percent of Mn, 0.063 to 0.149 weight percent of P, less than or equal to 0.035 weight percent of S, and the balance of Fe and inevitable impurities.
3. The method for extracting vanadium from high-silicon medium-vanadium molten iron by using a converter two-blowing two-pouring one-time slag tapping method according to claim 1, wherein in the step A, the chemical components of the scrap steel are as follows: 0.12 to 0.30wt% of C, 0.20 to 0.50wt% of Si, 0.45 to 1.15wt% of Mn, 0.025 to 0.055wt% of P, 0.020 to 0.045wt% of S, and the balance of Fe and inevitable impurities.
4. The method for extracting vanadium from high-silicon medium-vanadium molten iron by using a converter two-blowing two-pouring one-time slag tapping method according to claim 1, wherein in the step C, the lance position is controlled in a high-medium-low mode at 1200-900 mm.
5. The method for extracting vanadium from high-silicon molten vanadium iron by using a converter two-blowing two-pouring one-time slag tapping method according to claim 1, characterized in that in the step E, a hot slag sample is taken from the rear of the converter for analysis during semisteel tapping, and then vanadium slag is poured into a special slag basin.
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