CN117512362B - Method for extracting vanadium and dephosphorizing vanadium-containing molten iron - Google Patents
Method for extracting vanadium and dephosphorizing vanadium-containing molten iron Download PDFInfo
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- CN117512362B CN117512362B CN202311606013.9A CN202311606013A CN117512362B CN 117512362 B CN117512362 B CN 117512362B CN 202311606013 A CN202311606013 A CN 202311606013A CN 117512362 B CN117512362 B CN 117512362B
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- 229910052720 vanadium Inorganic materials 0.000 title claims abstract description 163
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 title claims abstract description 162
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 title claims abstract description 156
- 229910052742 iron Inorganic materials 0.000 title claims abstract description 81
- 238000000034 method Methods 0.000 title claims abstract description 55
- 239000002893 slag Substances 0.000 claims abstract description 147
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 111
- 239000010959 steel Substances 0.000 claims abstract description 111
- 238000007664 blowing Methods 0.000 claims abstract description 41
- 239000000126 substance Substances 0.000 claims abstract description 36
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 claims abstract description 28
- 230000008569 process Effects 0.000 claims abstract description 26
- 229910052698 phosphorus Inorganic materials 0.000 claims abstract description 21
- 239000011574 phosphorus Substances 0.000 claims abstract description 21
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims abstract description 20
- GNTDGMZSJNCJKK-UHFFFAOYSA-N divanadium pentaoxide Chemical compound O=[V](=O)O[V](=O)=O GNTDGMZSJNCJKK-UHFFFAOYSA-N 0.000 claims description 22
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 14
- 239000001301 oxygen Substances 0.000 claims description 14
- 229910052760 oxygen Inorganic materials 0.000 claims description 14
- 238000007885 magnetic separation Methods 0.000 claims description 12
- 235000013980 iron oxide Nutrition 0.000 claims description 10
- 238000001816 cooling Methods 0.000 claims description 7
- 239000000696 magnetic material Substances 0.000 claims description 7
- 229910052757 nitrogen Inorganic materials 0.000 claims description 5
- 229910052751 metal Inorganic materials 0.000 claims description 4
- 239000002184 metal Substances 0.000 claims description 4
- VBMVTYDPPZVILR-UHFFFAOYSA-N iron(2+);oxygen(2-) Chemical class [O-2].[Fe+2] VBMVTYDPPZVILR-UHFFFAOYSA-N 0.000 claims description 3
- 238000000605 extraction Methods 0.000 abstract description 13
- 239000000203 mixture Substances 0.000 description 13
- 238000009628 steelmaking Methods 0.000 description 10
- 238000003723 Smelting Methods 0.000 description 8
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 6
- 239000008188 pellet Substances 0.000 description 5
- 239000000463 material Substances 0.000 description 4
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 3
- 230000009471 action Effects 0.000 description 3
- JHLNERQLKQQLRZ-UHFFFAOYSA-N calcium silicate Chemical compound [Ca+2].[Ca+2].[O-][Si]([O-])([O-])[O-] JHLNERQLKQQLRZ-UHFFFAOYSA-N 0.000 description 3
- 229910052918 calcium silicate Inorganic materials 0.000 description 3
- 235000012241 calcium silicate Nutrition 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 230000007547 defect Effects 0.000 description 3
- 239000000428 dust Substances 0.000 description 3
- 239000001257 hydrogen Substances 0.000 description 3
- 229910052739 hydrogen Inorganic materials 0.000 description 3
- PNXOJQQRXBVKEX-UHFFFAOYSA-N iron vanadium Chemical compound [V].[Fe] PNXOJQQRXBVKEX-UHFFFAOYSA-N 0.000 description 3
- 239000006148 magnetic separator Substances 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 229910052596 spinel Inorganic materials 0.000 description 3
- 239000011029 spinel Substances 0.000 description 3
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 2
- 235000011941 Tilia x europaea Nutrition 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 2
- 239000010931 gold Substances 0.000 description 2
- 229910052737 gold Inorganic materials 0.000 description 2
- 239000004571 lime Substances 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- 239000002253 acid Substances 0.000 description 1
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 description 1
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 1
- 239000000292 calcium oxide Substances 0.000 description 1
- 239000002826 coolant Substances 0.000 description 1
- 230000001351 cycling effect Effects 0.000 description 1
- 238000006477 desulfuration reaction Methods 0.000 description 1
- 230000023556 desulfurization Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000007306 turnover Effects 0.000 description 1
Classifications
-
- 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
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/064—Dephosphorising; Desulfurising
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B3/00—General features in the manufacture of pig-iron
- C21B3/04—Recovery of by-products, e.g. slag
-
- 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
- C21C5/32—Blowing from above
-
- 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
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B7/00—Working up raw materials other than ores, e.g. scrap, to produce non-ferrous metals and compounds thereof; Methods of a general interest or applied to the winning of more than two metals
- C22B7/001—Dry processes
-
- 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
- C22B7/00—Working up raw materials other than ores, e.g. scrap, to produce non-ferrous metals and compounds thereof; Methods of a general interest or applied to the winning of more than two metals
- C22B7/04—Working-up slag
-
- 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
- C21C2200/00—Recycling of waste material
-
- 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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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Environmental & Geological Engineering (AREA)
- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
- Carbon Steel Or Casting Steel Manufacturing (AREA)
Abstract
The invention provides a vanadium extraction and dephosphorization method for vanadium-containing molten iron, which comprises the following steps: s1, converting the first vanadium-containing molten iron, wherein iron oxide is added in batches in the converting process, and the first steel slag is obtained after the initial converting is finished; pouring and sorting the first steel slag to obtain a first vanadium-containing magnetic substance and a first phosphorus-containing nonmagnetic substance; s2, converting the second vanadium-containing molten iron, wherein the first vanadium-containing magnetic substance and/or iron oxide are added in batches in the converting process, and the second steel slag is obtained after the initial converting is finished; pouring out and sorting the second steel slag to obtain a second vanadium-containing magnetic substance and a second phosphorus-containing nonmagnetic substance; according to the method, a second vanadium-containing magnetic substance is obtained and used for blowing third vanadium-containing molten iron until SN is obtained, wherein SN is obtained for blowing the Nth vanadium-containing molten iron, the N-1-th vanadium-containing magnetic substance and/or iron oxide are added in batches in the blowing process, and the Nth steel slag is obtained after the initial blowing is finished; pouring out and sorting the Nth steel slag to obtain an Nth vanadium-containing magnetic substance and an Nth phosphorus-containing nonmagnetic substance; n is more than or equal to 2, and the vanadium extraction rate of the method can reach more than 90 percent.
Description
Technical Field
The invention relates to the technical field of vanadium-containing molten iron steelmaking, in particular to a method for extracting vanadium and dephosphorizing from vanadium-containing molten iron.
Background
At present, molten iron with high vanadium content (0.15-0.4%) generally adopts a duplex process, namely vanadium slag is firstly blown in a vanadium blowing furnace, and then semisteel is dephosphorized and steelmaking in another converter. However, the vanadium extraction process by the converter duplex method has certain defects, the vanadium slag blown by the vanadium blowing converter is acid slag, and under the condition of semisteel temperature (1370-1420 ℃), even if TFe in the vanadium slag reaches 28%, the viscosity of the vanadium slag is still large, so that the MFe content in the slag also reaches more than 11%; the productivity of converter shop steelmaking is low, semisteel turnover needs a certain time, and the smelting period is prolonged; when semisteel is used for steelmaking, the heat of converter smelting is intense, and considerable scrap steel cannot be treated; about 10% of the residual vanadium in the semisteel is lost along with the steel slag after the semisteel is steelmaking, and the other part of the residual vanadium is lost along with the semisteel slag; the semi-steel steelmaking slag amount is small, so that the metal desulfurization rate is low. The single slag method of the converter for extracting vanadium has the defects: the vanadium slag is low in quality, and the average value of the mass fraction of V 205 is less than 10%; the mass fraction of the calcium oxide is up to about 40%, and no effective method is available for extracting the vanadium pentoxide. The low-vanadium molten iron containing less than or equal to 0.15 percent of vanadium is generally not extracted, lime is directly added for steelmaking, and vanadium element in the low-vanadium molten iron is oxidized and then is poured out along with steel slag.
For decades, in order to obtain vanadium resources in steel slag, a great deal of research is carried out by professionals, and no process technology capable of being put into industrial application is developed so far, so that a great deal of vanadium resources are wasted along with the steel slag.
Disclosure of Invention
(One) solving the technical problems
Aiming at the defects of the prior art, the invention provides a method for extracting vanadium and dephosphorizing from vanadium-containing molten iron, which is a method for directly enriching vanadium and phosphorus elements into two different ore phases in steel slag and producing vanadium slag while dephosphorizing in converter steelmaking.
(II) technical scheme
In order to achieve the above purpose, the invention is realized by the following technical scheme:
a method for extracting vanadium and dephosphorizing vanadium-containing molten iron comprises the following steps:
S1, implementing slag-reserving operation. Adding scrap steel into first vanadium-containing molten iron, performing down-gun blowing on the first vanadium-containing molten iron, adding iron oxide in batches in the blowing process, and obtaining first steel slag after the initial blowing is finished; pouring out the first steel slag, cooling, crushing and sorting to obtain a first vanadium-containing magnetic substance and a first phosphorus-containing non-magnetic substance;
S2, implementing slag-reserving operation. Adding scrap steel into second vanadium-containing molten iron, performing down-gun converting on the second vanadium-containing molten iron, adding first vanadium-containing magnetic substances and/or iron oxides in batches in the converting process, and obtaining second steel slag after the initial converting is finished; pouring out the second steel slag, cooling, crushing and sorting to obtain a second vanadium-containing magnetic substance and a second phosphorus-containing non-magnetic substance; the second vanadium-containing magnetic material is used for blowing the third vanadium-containing molten iron until,
SN, implementing slag-leaving operation. Adding scrap steel into the Nth vanadium-containing molten iron, blowing the Nth vanadium-containing molten iron by a submerged gun, and adding the N-1 vanadium-containing magnetic substance and/or iron oxide in batches in the blowing process to obtain the Nth steel slag after the initial blowing is finished; pouring out the Nth steel slag, cooling, crushing and sorting to obtain an Nth vanadium-containing magnetic substance and an Nth phosphorus-containing non-magnetic substance;
N is more than or equal to 2.
Preferably, the alkalinity of the first steel slag, the second steel slag and the Nth steel slag is 1.0-1.5.
Preferably, the content of metallic iron in the first steel slag, the second steel slag and the Nth steel slag is 4-12 mass%.
Preferably, if the content of vanadium in the nth vanadium-containing molten iron is 0.15 to 0.4 mass%, n=2, and the content of vanadium pentoxide in the nth vanadium-containing magnetic material is not less than 15 mass%.
Preferably, if the content of vanadium in the Nth vanadium-containing molten iron is 0.06-0.15 mass%, N is not less than 3 and not more than 5, and the vanadium pentoxide content of the Nth vanadium-containing magnetic substance is not less than 8 mass%.
Preferably, the alkalinity of the first steel slag, the second steel slag and the N steel slag is 1.3-1.5, and the content of metallic iron in the first steel slag, the second steel slag and the N steel slag is 5-10 mass%.
Preferably, the MgO content in the first steel slag, the second steel slag and the Nth steel slag is 0-5% by mass.
Preferably, the lower gun converting adopts a converting process with low gun position and high oxygen supply intensity, wherein the gun position is 100-200mm lower than the gun position in the earlier stage of converting by the conventional process, and the high oxygen supply intensity is more than or equal to 3.0 m/(min.t); the sorting includes magnetic separation or reselection.
(III) beneficial effects
The invention provides a method for extracting vanadium and dephosphorizing vanadium-containing molten iron. Compared with the prior art, the method has the following beneficial effects:
The vanadium extraction and dephosphorization method of the vanadium-containing molten iron solves a series of problems existing in a high vanadium molten iron duplex method and a single slag process, and slag is cooled and separated while steel-making dephosphorization is satisfied in a single converter, so that a vanadium slag product accepted in the market can be produced; after the low vanadium molten iron converter steelmaking, vanadium element is not abandoned along with vanadium-containing steel slag, but is enriched through the process cycle iteration, so that the market value is obtained. The more the number of repeated cycling enrichment iteration is, the higher the grade of vanadium slag obtained by enriching vanadium is, and the lower the consumption of steel materials in a steel plant is; the more the number of times of circulating enrichment iteration of the vanadium-containing magnetic separation material is, the higher the grade of the obtained vanadium slag is, the lower the ton steel consumption is, because when vanadium is not extracted, slag with considerable iron content and high iron content is poured out from each furnace, and the slag cannot be recovered and discarded.
Compared with the vanadium extraction process of the double converter, the alkaline slag of the vanadium-containing initial stage slag poured by the process has low alkalinity, R is 1.3-1.5, and V 2O5 in the alkaline slag has the effect of thin slag, so that the slag has better fluidity and lower metal iron content under the condition of lower TFe content and lower temperature (1370-1420 ℃), and the metal consumption is greatly saved.
In addition, after the vanadium is extracted from the steel slag by separation, the rest can be used for other purposes. Therefore, the process method solves the problem of utilizing the steel slag while producing the vanadium slag, and has great economic and social benefits.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention are clearly and completely described, and it is obvious that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The embodiment of the application solves the technical problem that the content of V 205 in vanadium slag is small in the existing vanadium extracting and dephosphorizing method of the vanadium-containing molten iron by providing the vanadium extracting and dephosphorizing method of the vanadium-containing molten iron.
The technical scheme in the embodiment of the application aims to solve the technical problems, and the overall thought is as follows:
According to the vanadium extraction and dephosphorization method for the vanadium-containing molten iron, disclosed by the invention, the alkalinity of the slag at the initial stage of pouring is controlled to be 1.3-1.5, dephosphorization is not influenced, P 2O5 in the slag is mainly enriched in dicalcium silicate, and V 2O5 is mainly distributed in the iron-containing phase. After the steel slag enters the slag pot, a certain reducing atmosphere can be maintained in the slag, and V +5 and V +4 are uniformly reduced to V +3 to form vanadium iron spinel with iron oxide. So that the phosphorus and the vanadium respectively enter a dicalcium silicate phase and a vanadium iron spinel phase, the specific gravity of the dicalcium silicate phase and the vanadium iron spinel phase are about 50 percent different, one is non-magnetic, and the other is magnetic, and the two are separated through magnetic separation, air separation and reselection.
The low gun position and high oxygen supply intensity are adopted, the stirring of a molten pool is enhanced, and the Fe0 content is controlled to 9-15% after blowing is finished, so that the dephosphorization under the low alkalinity condition is facilitated, and the enrichment of vanadium is facilitated.
The vanadium-containing magnetic material prepared by the application. The vanadium slag is used as a coolant for iteration, so that the V 2O5 in the converter slag is enriched and improved, the vanadium slag can reach the national standard after two times of circulating enrichment by blowing high vanadium molten iron, and the vanadium slag can be accepted in the market after 3-5 times of circulating enrichment of low vanadium molten iron. The (FeO) and metallic iron in the magnetic separation material are returned to the converter, so that the cooling and oxidizing effects of iron oxide are replaced, and the iron loss is greatly reduced.
In order to better understand the above technical solution, the following describes the above technical solution in detail with reference to specific embodiments.
Example 1
| Molten iron composition | C | V | P | S | Si | Temperature, DEG C |
| Content of% | 4.4 | 0.18 | 0.10 | 0.015 | 0.3 | 1290 |
After the slag splashing of the previous furnace is finished, the slag is left in the furnace completely, 120 tons of molten iron is added, 10 tons of scrap steel is added, a dust removal fan is accelerated to a proper position, and the operation of adding molten iron and scrap steel is carried out: after the ignition of the hydrogen gun is successful, the gun is quickly lowered to a low gun position of 1.1 m from the spray head to perform blowing (the conventional process is 0.8 m), the oxygen supply intensity is 3.06m/min/t, the bottom blowing nitrogen intensity is controlled according to 0.2Nm 3/t.min, no slag is added, the earlier stage slag alkalinity is controlled to be 1.3-1.5, the Mg0 content is less than 5%, iron oxide pellets are added in batches in the blowing process, the addition amount is controlled to be 25kg/t, the FeO content is controlled to be 9-15%, the oxygen blowing is performed for 5 minutes to 30 seconds, the slag is discharged after the furnace is poured, and the temperature is 1390 ℃. And the deslagging is about 6.2t.
Semisteel composition: 3.8% of C, 0.021% of V and 0.034% of P. The vanadium extraction rate is 88 percent and the dephosphorization rate is 66 percent.
Vanadium extraction rate= (vanadium content in molten iron before converting-vanadium content in semisteel after converting)/vanadium content in molten iron before converting is multiplied by 100%.
Dephosphorization rate= (phosphorus content in molten iron before converting-phosphorus content in semisteel after converting)/phosphorus content in molten iron before converting x 100%.
The main components of the vanadium-containing steel slag are as follows: alkalinity 1.42, p 2O5 3.5％,V2O5 4.5.4%, TFe 8%, mfe6.2%.
The poured steel slag is conveyed to a slag treatment field, cooled and conveyed to a steel slag crushing, grinding and sorting field, the steel slag is ground to 300 meshes, and 20kg of first vanadium-containing magnetic substances with V of 7.2 percent V 2O5 and V of 12.8 percent are obtained by measuring and calculating ton of steel through magnetic separation, wherein the V of the first phosphorus-containing non-magnetic substances is less than 1 percent and 40kg.
The steel consumption per ton is 1068 kg/t.
Example 2
| Molten iron composition | C | V | p | S | Si | Temperature, DEG C |
| Content of% | 4.1 | 0.38 | 0.08 | 0.012 | 0.035 | 1302 |
After the slag splashing of the previous furnace is finished, the slag is left in the furnace completely, the slag is left completely, 125t of molten iron and 12t of scrap steel are added, a dust removal fan is accelerated to a proper position, and the operation of adding molten iron and scrap steel is carried out: after the operation of adding molten iron and scrap steel is finished, the converter furnace is rocked upwards to a zero position in a main control room, the main blowing is clicked, the lower gun is ignited, after the ignition of the hydrogen gun is successful, the gun is quickly lowered to a low gun position of 1.2 m from a spray head to the gold liquid surface for blowing, the oxygen supply intensity is 3.06m/min/t, the bottom blowing nitrogen intensity is controlled according to 0.2Nm 3/t.min, no slag charge is added, the earlier stage slag alkalinity is controlled to be 1.3-1.5, the Mg0 content is less than 5%, the first vanadium-containing magnetic material in the embodiment 1 is added in batches in the blowing process, the addition amount is controlled to be 20kg/t and 10kg/t of sintered ore, the oxygen blowing is carried out for 5 minutes and 50 seconds, the slag is discharged after the furnace is poured, and the temperature is 1400 ℃. And deslagging for about 6t.
Semisteel composition: c3.5%, V0.0304%, P0.025%, and the vanadium extraction rate is 92% and the dephosphorization rate is 68%.
The main components of the vanadium-containing steel slag are as follows: alkalinity 1.5, P 2O5 3.4％,V2O5 8.5.5%, TFe 11%, MFe9.1%.
The poured steel slag is conveyed to a slag treatment field, cooled and conveyed to a steel slag crushing, grinding and sorting field, the steel slag is ground to 300 meshes, and 30kg of a second vanadium-containing magnetic separation object with V11.0% and V 2O5 19.6.6% is obtained after magnetic separation and measurement of ton steel, and the V of the second phosphorus-containing non-magnetic object is less than 1% and 40kg.
The steel consumption per ton is 1067 kg/t.
Example 3
| Molten iron composition | C | V | P | S | Si | Temperature, DEG C |
| Content of% | 4.4 | 0.06 | 0.088 | 0.012 | 0.31 | 1323 |
After the slag splashing of the previous furnace is finished, the slag is left in the furnace completely, 120 tons of molten iron is added, 11 tons of scrap steel is added, a dust removal fan is accelerated to a proper position, and the operation of adding molten iron and scrap steel is carried out: after the ignition of the hydrogen gun is successful, the gun is quickly lowered to a low gun position of 1.1 meter of the gold liquid surface for blowing, the oxygen supply intensity is 3.06m/min/t, the bottom blowing nitrogen intensity is controlled according to 0.2Nm 3/t.min, no slag is added, the early stage slag breaking degree is controlled to be 1.3-1.5, the Mg0 content is less than 5%, iron oxide pellets are added in batches in the blowing process, the adding amount is controlled to be 35kg/t, the oxygen blowing is carried out for 5 minutes and 20 seconds, the slag is discharged after the furnace is poured, and the temperature is 1383 ℃. And deslagging for about 5.4t.
Semisteel composition: c3.8%, V0.009%, P0.029%, and the vanadium extraction rate is 85% and the dephosphorization rate is 66%.
The main components of the vanadium-containing steel slag are as follows: alkalinity 1.45, P 2O5 3.1％,V2O5 1.8.8%, TFe 8%, MFe7.2%.
The poured steel slag is conveyed to a slag treatment field, cooled and conveyed to a steel slag crushing, grinding and sorting field, the steel slag is ground to 300 meshes, and 20kg of first vanadium-containing magnetic substances with V of 2.1% and 40kg of first phosphorus-containing non-magnetic substances with V of less than 1% are obtained through magnetic separation and measurement of ton steel.
The steel consumption per ton is 1064 kg/t.
Example 4
| Molten iron composition | C | V | P | S | Si | Temperature, DEG C |
| Content of% | 4.2 | 0.09 | 0.09 | 0.015 | 0.30 | 1310 |
The smelting step is the same as in example 3, except that 20kg/t of the first vanadium-containing magnetic separator and 15kg/t of the oxidized pellets in example 3 are added in the later stage of the initial converting, and after the blowing, the slag is poured out.
Semisteel composition: c3.8%, V0.009%, P0.033%, and the vanadium extraction rate is 90% and the dephosphorization rate is 63%.
The main components of the vanadium-containing steel slag are as follows: alkalinity 1.43, P 2O5 3.3％,V2O5 3.9.9%, TFe 6.5%, MFe7.2%.
The poured steel slag is conveyed to a slag treatment field, cooled and conveyed to a steel slag crushing, grinding and sorting field, the steel slag is ground to 300 meshes, and after magnetic separation, the steel slag is measured and calculated to obtain 25kg of a second vanadium-containing magnetic substance with the V of 2.6 percent and the V 2O5 4.6.6 percent, and the V of the second phosphorus-containing non-magnetic substance is less than 1 percent and 40kg.
The steel consumption per ton is 1066 kg/t.
Example 5
| Molten iron composition | C | V | P | S | Si | Temperature, DEG C |
| Content of% | 4.3 | 0.06 | 0.081 | 0.014 | 0.34 | 1301 |
The smelting step is the same as in example 3, except that 25kg/t of the second vanadium-containing magnetic separator and 10kg/t of the oxidized pellets in example 4 are added in the later stage of the initial converting, and the slag is poured out after the blowing.
Semisteel composition: c3.5%, V0.009%, P0.032%, and the vanadium extraction rate is 85% and the dephosphorization rate is 60%.
The main components of the vanadium-containing steel slag are as follows: alkalinity 1.3, P 2O5 3.2％,V2O5 5.5.5%, TFe 6.5%, MFe7.2%.
The poured steel slag is conveyed to a slag treatment field, cooled and conveyed to a steel slag crushing, grinding and sorting field, the steel slag is ground to 300 meshes, and 25kg of third vanadium-containing magnetic substances with the reduced V 2O5% and 40kg of third phosphorus-containing non-magnetic substances with the reduced V <1% are obtained through magnetic separation and measurement of ton steel.
The steel consumption per ton is 1063 kg/t.
Example 6
| Molten iron composition | C | V | P | S | Si | Temperature, DEG C |
| Content of% | 4.3 | 0.06 | 0.088 | 0.011 | 0.34 | 1295 |
The smelting step is the same as in example 3, except that 25kg/t of the third vanadium-containing magnetic separator and 10kg/t of the oxidized pellets in example 5 are added in the later stage of the initial converting, and after the blowing, the slag is poured out.
Semisteel composition: c3.5%, V0.0066%, P0.035%, and the vanadium extraction rate is 89% and the dephosphorization rate is 65%.
The main components of the vanadium-containing steel slag are as follows: alkalinity 1.5, P 2O5 3.1％,V2O5 9.5.5%, TFe 6.5%, MFe7.2%.
The poured steel slag is conveyed to a slag treatment field, cooled and conveyed to a steel slag crushing, grinding and sorting field, the steel slag is ground to 300 meshes, and after magnetic separation, the fourth vanadium-containing magnetic substance with V of 6.5 percent and V 2O5 11.6.6 percent and 25kg and the fourth phosphorus-containing nonmagnetic substance with V of less than 1 percent and 40kg are obtained through measuring and calculating ton steel.
The steel consumption per ton is 1065 kg/t.
Comparative example 1
| Molten iron composition | C | V | P | S | Si | Temperature, DEG C |
| Content of% | 4.3 | 0.07 | 0.089 | 0.013 | 0.32 | 1305 |
After the steel is discharged from the previous furnace, 50% of slag is poured, 50% of slag is left, the slag splashing furnace protection operation is carried out, and the residual slag is left in the furnace after the slag splashing is finished. And after 20.2t of scrap steel, 110t of molten iron and 3t of iron sheet are added, the converter mouth is rocked upwards to a zero position, the converter is ignited in a lower gun, after oxygen gun point is successful, constant pressure gun position changing operation is adopted, the oxygen supply flow is 3.6Nm/t/min, the smelting gun position is controlled to be 1.2-1.8 m, the oxygen supply is 36%, lime is added in three batches for 5.4t in total, and the smelting is carried out for 14min06s. When smelting is finished, the final temperature is 1648 ℃, the final phosphorus is 0.009%, the final slag alkalinity is 3.3, the final slag TFe is 15%, and V 2O5 1.3.3%.
The steel consumption per ton is 1065 kg/t.
As can be seen from the examples 1 and 2, the high vanadium molten iron is enriched twice by the technical scheme of the invention, and the V content of vanadium slag is 11 percent, which is converted into V 2O5 19.6.6 percent.
As can be seen from examples 3 to 6, the low vanadium molten iron is subjected to three times of enrichment, the V content of vanadium slag is folded into V 2O5%, and the V content of four times of enrichment is folded into V 2O5 11.6.6%.
As can be seen from comparison of examples 1-6 and comparative example 1, the vanadium recovery rate of the low-vanadium molten iron treated by the technical scheme of the invention reaches 60-70%, and the consumption of steel materials is reduced by about 10kg/t steel.
Vanadium in the low-vanadium molten iron in comparative example 1 is lost with the steel slag.
It is noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention. The present invention is not described in detail in the present application, and is well known to those skilled in the art.
Claims (6)
1. The method for extracting vanadium and dephosphorizing from vanadium-containing molten iron is characterized by comprising the following steps of:
s1, providing first vanadium-containing molten iron, performing down-gun blowing on the first vanadium-containing molten iron, adding iron oxide in batches in the blowing process, and obtaining first steel slag after the initial blowing is finished; pouring out the first steel slag, cooling, crushing and sorting to obtain a first vanadium-containing magnetic substance and a first phosphorus-containing non-magnetic substance;
S2, providing second vanadium-containing molten iron, carrying out down-gun converting on the second vanadium-containing molten iron, and adding first vanadium-containing magnetic substances and/or iron oxides in batches in the converting process, wherein the initial converting is finished to obtain second steel slag; pouring out the second steel slag, cooling, crushing and sorting to obtain a second vanadium-containing magnetic substance and a second phosphorus-containing non-magnetic substance; the second vanadium-containing magnetic material is used for blowing the third vanadium-containing molten iron until,
SN, providing N vanadium-containing molten iron, carrying out gun blowing on the N vanadium-containing molten iron, adding N-1 vanadium-containing magnetic substances and/or iron oxides in batches in the blowing process, and obtaining N steel slag after the initial blowing is finished; pouring out the Nth steel slag, cooling, crushing and sorting to obtain an Nth vanadium-containing magnetic substance and an Nth phosphorus-containing non-magnetic substance;
N is more than or equal to 2;
the alkalinity of the first steel slag, the second steel slag and the N steel slag is 1.3-1.5;
The metal iron content in the first steel slag, the second steel slag and the N steel slag is 4-12 mass%.
2. The method for extracting vanadium and dephosphorizing from vanadium-containing molten iron according to claim 1, wherein if the content of vanadium in the nth vanadium-containing molten iron is 0.15-0.4 mass%, then n=2, and the content of vanadium pentoxide in the nth vanadium-containing magnetic material is not less than 15 mass%.
3. The method for extracting vanadium and dephosphorizing from vanadium-containing molten iron according to claim 1, wherein if the content of vanadium in the Nth vanadium-containing molten iron is 0.06-0.15 mass%, N is 3-5, and the vanadium pentoxide content of the Nth vanadium-containing magnetic material is 8 mass%.
4. The method for extracting vanadium and dephosphorizing from vanadium-containing molten iron according to claim 1, wherein the content of metallic iron in the first steel slag, the second steel slag and the Nth steel slag is 5-10% by mass.
5. The method for extracting vanadium and dephosphorizing from vanadium-containing molten iron according to claim 1, wherein the content of MgO in the first steel slag, the second steel slag and the Nth steel slag is 0-5% by mass.
6. The method for extracting vanadium and dephosphorizing from vanadium-containing molten iron according to claim 1, wherein the lower lance blowing adopts a low lance position and high oxygen supply strength blowing process, the low lance position is 100-200mm lower than the lance position in the earlier stage of the conventional process blowing, and the high oxygen supply strength is more than or equal to 3.0 m/(min.t); the sorting includes magnetic separation or reselection.
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| CN103614564A (en) * | 2013-11-01 | 2014-03-05 | 西安建筑科技大学 | Method for continuously smelting vanadium-containing ferrophosphorous |
| CN105349728A (en) * | 2015-11-26 | 2016-02-24 | 攀钢集团攀枝花钢铁研究院有限公司 | Method for simultaneously conducting dephosphorization and vanadium extraction on vanadium-contained molten iron through converter |
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| CN107058670B (en) * | 2017-04-25 | 2019-11-29 | 河钢股份有限公司承德分公司 | Utilize the method for the auxiliary vanadium extraction by converter blowing of iron containing vanadium slag |
| CN107641678A (en) * | 2017-09-29 | 2018-01-30 | 四川德胜集团钒钛有限公司 | A kind of vanadium-bearing hot metal vanadium extraction by converter blowing technique |
| CN110079643A (en) * | 2019-05-16 | 2019-08-02 | 成都先进金属材料产业技术研究院有限公司 | Using the method for lime treatment vanadium-bearing hot metal vanadium extraction |
| CN112981045B (en) * | 2021-02-09 | 2022-03-22 | 东北大学 | Method for dephosphorizing and preserving vanadium of molten iron containing vanadium and phosphorus |
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| CN103614564A (en) * | 2013-11-01 | 2014-03-05 | 西安建筑科技大学 | Method for continuously smelting vanadium-containing ferrophosphorous |
| CN105349728A (en) * | 2015-11-26 | 2016-02-24 | 攀钢集团攀枝花钢铁研究院有限公司 | Method for simultaneously conducting dephosphorization and vanadium extraction on vanadium-contained molten iron through converter |
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