CN101215619A - Method for extracting vanadium and removing phosphorus from vanadium-containing molten iron and steel-smelting technique using the same method - Google Patents
Method for extracting vanadium and removing phosphorus from vanadium-containing molten iron and steel-smelting technique using the same method Download PDFInfo
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- CN101215619A CN101215619A CNA2008100020118A CN200810002011A CN101215619A CN 101215619 A CN101215619 A CN 101215619A CN A2008100020118 A CNA2008100020118 A CN A2008100020118A CN 200810002011 A CN200810002011 A CN 200810002011A CN 101215619 A CN101215619 A CN 101215619A
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Abstract
The invention provides a vanadium extraction dephosphorization process from vanadium melted iron and a steel-smelting technology which uses the process. The vanadium extraction dephosphorization process from vanadium melted iron comprises adding vanadium extraction dephosphorization agent and cooling agent in melted iron in the process of oxygen supply blowing for vanadium melted iron, and obtaining vanadium slag and low phosphorus semi-steel. The process can extract vanadium at the same time of dephosphorization, thereby not only guaranteeing the effective extraction of vanadium, but also effectively removing phosphorus in melted iron.
Description
Technical field
The present invention relates to a kind of pretreatment process of molten iron and utilize the process for making of this method, more particularly, the present invention relates to a kind of from vanadium-bearing hot metal the method for vanadium extraction and dephosphorization and the process for making that utilizes this method.
Background technology
The step that traditional process for making comprises has: blast-melted → desulfurization → vanadium extraction (getting half steel) → steel-making → and must Finished Steel.Specifically, blast furnace ironmaking obtains vanadium-bearing hot metal, through even composition of hot metal mixer and temperature and store described molten iron, then vanadium-bearing hot metal is blended into Converter Oxigen Blowing and makes the vanadium oxidation enter vanadium slag, and the converter steelmaking of subsequently molten iron after the vanadium extraction being packed into obtains Finished Steel.
Yet along with development of technology, the quality to steel in the industry has proposed more and more higher requirement, requires more and more lower to harmful element contained in the steel such as phosphorus, sulphur equal size.Therefore, the content of harmful elements such as reduction phosphorus, sulphur has become iron and steel enterprise's important topic to be solved.
No. 00113001.3 Chinese invention patent application discloses a kind of semi-steel dephosphorizing desulfurizing steel-making technology.As shown in Figure 1, the flow process of this technology is: carry out desulfurization and handle blast-melted, then the molten iron after the desulfurization is carried out vanadium extraction, vanadium extraction obtains half steel after handling, and half steel is carried out dephosphorization and desulfurization again and handles, and enters converter steelmaking at last, obtains low-phosphorous Finished Steel.Process from blast-melted to steel-making that this method is perfect has increased pre-dephosphorization treatment before steel-making, alleviated the burden of converter steelmaking dephosphorization, for good condition has been made in steel-making.
No. 200510021749.5 Chinese invention patent application discloses a kind of method of utilizing sefstromite concentrate to produce ferrotianium, steel and vanadium iron, the steps include: 1) add basic metal reduction sefstromite concentrate; 2) the reduced iron fusing separates; 3) vanadium-bearing hot metal is carried out dephosphorization treatment; 4) enter converter and blow vanadium steel-making, molten steel ingot casting; 5) with steel-making slag melting vanadium-bearing hot metal, to the vanadium-bearing hot metal rich vanadium slag of oxygen blowing; 6) rich vanadium slag smelting ferrovanadium; 7) the molten slag melting ferrotianium that divides.As can be seen, this method had also been carried out pre-dephosphorization treatment to vanadium-bearing hot metal in order to reduce the phosphorus content of steely iron water before blowing vanadium from aforesaid method.
Therefore, the method for the content of phosphorus is in the currently used reduction Finished Steel: after vanadium extraction obtains half steel half steel is carried out dephosphorization treatment, perhaps before vanadium extraction from hot metal is got half steel molten iron is carried out pre-dephosphorization treatment.In order to reduce the phosphorus content in the Finished Steel, on the basis of original process for making, increased the operation of a step dephosphorization like this, made process complications.
Summary of the invention
The object of the present invention is to provide a kind of from vanadium-bearing hot metal the method for vanadium extraction and dephosphorization, this method can be when extracting vanadium dephosphorization, thereby can not only guarantee effective extraction of vanadium, and can effectively remove the phosphorus in the molten iron.
Another object of the present invention is to provide a kind of from vanadium-bearing hot metal the process for making of vanadium extraction and dephosphorization, in this technology, can be when extracting vanadium dephosphorization, understand shortened process like this, cut down the consumption of energy, thereby reduce production costs.
The invention provides a kind of from vanadium-bearing hot metal the method for vanadium extraction and dephosphorization, described method comprises: in the process of vanadium-bearing hot metal being carried out the oxygen supply blowing, add vanadium extraction and dephosphorization agent and refrigerant in described molten iron, the blowing back obtains vanadium slag and low-phosphorous half steel.
In above-mentioned vanadium extraction and dephosphorization method, can before described oxygen supply blowing beginning, in described molten iron, add vanadium extraction and dephosphorization agent, and in described oxygen supply was blown 1～5 minute, add refrigerant; Perhaps, in described oxygen supply blowing 1～5 minute, in described molten iron, add vanadium extraction and dephosphorization agent and refrigerant.The oxygen supply duration of blast is 3.0～20.0 minutes, and the terminal temperature of oxygen supply blowing is 1300～1500 ℃.The dephosphorizing agent of Jia Ruing is Na in the method
2CO
3And add-on is 5～50kg/tFe, and the refrigerant of adding is that iron scale and add-on are 0～30kg/tFe.In addition, can also add magnesia and carry out residue adjustment adding dephosphorizing agent and refrigerant oxygen supply blowing after 5 minutes.After oxygen supply after the residue adjustment was blown about 0.5～1 minute, go out low-phosphorous half steel and vanadium slag.
By above-mentioned oxygen supply converting process, the slag rate after the blowing 〉=3.0%, the grade of the vanadium slag that obtains reaches more than 5%, and the rate of recovery of vanadium is more than 80%; In the low-phosphorous low-sulfur half steel that obtains, C content more than 3.0%, P content below 0.050% and S content below 0.020%, the dephosphorization rate of half steel reaches more than 75%.
The present invention also provides the process for making of vanadium extraction and dephosphorization from vanadium-bearing hot metal, and this technology comprises: pack into blast furnace or electric furnace of the iron ore that will contain vanadium smelted, vanadium-bearing hot metal; Vanadium-bearing hot metal is carried out desulfurization to be handled; The vanadium extraction and dephosphorization when vanadium-bearing hot metal after the desulfurization is carried out the oxygen supply blowing obtains vanadium slag and low-phosphorous low-sulfur half steel; From vanadium slag, extract vanadium, and low-phosphorous low-sulfur half steel is used to smelt low-phosphorous low-sulfur steel, wherein, the described step that vanadium-bearing hot metal after the desulfurization is carried out oxygen supply blowing time vanadium extraction and dephosphorization comprises: in the process of vanadium-bearing hot metal being carried out the oxygen supply blowing, add vanadium extraction and dephosphorization agent and refrigerant in described molten iron, the blowing back obtains vanadium slag and low-phosphorous half steel.
According to of the present invention from vanadium-bearing hot metal the method for vanadium extraction and dephosphorization and the process for making that utilizes this method, not only can guarantee the extraction of vanadium, and can remove the phosphorus content in the molten iron effectively, alleviated the dephosphorization pressure of steel making working procedure greatly.
Description of drawings
Below, in conjunction with the accompanying drawings the present invention is described in detail, wherein:
Fig. 1 is the schema of traditional steel-smelting technology;
Fig. 2 is the schema of the steelmaking process of vanadium extraction and dephosphorization simultaneously from vanadium-bearing hot metal according to the embodiment of the invention.
Embodiment
Below, with reference to Fig. 2 the steelmaking process of vanadium extraction and dephosphorization simultaneously from vanadium-bearing hot metal according to the embodiment of the invention is described.
As shown in Figure 2, in the process for making process, at first utilize the vanadium-bearing hot metal produced by blast furnace or electric furnace and it is carried out desulfurization handle, what obtain V 〉=0.20%, P 〉=0.06% and S≤0.020% contains the doctor negative molten iron of vanadium; To contain the vanadium low-sulfur molten iron then and be blended in converter or the hot metal ladle, carry out the oxygen supply blowing by drafting cooling system, oxygen supply system and terminal point control techniques; Before the oxygen supply blowing beginning or the early stage of oxygen supply blowing in stove or add the vanadium extraction and dephosphorization agent of 5～50kg/tFe in the bag, and blowing vanadium early stage in stove or add the refrigerant of 0～30kg/tFe in the bag, vanadium extraction and dephosphorization agent is mainly sodium salt, and refrigerant is an acid material; Duration of blast is 3.0～20.0 minutes, and the terminal temperature of blowing is 1300～1500 ℃; Obtain vanadium slag and low-phosphorous low-sulfur half steel behind the vanadium extraction and dephosphorization.In the half steel that obtains, C content more than 3.0%, P content below 0.050% and S content below 0.020%, the dephosphorization rate of half steel reaches more than 75%.Get Finished Steel behind the semi-steel making that obtains.In addition, slag rate 〉=3.0% of the vanadium after the oxygen supply blowing, the grade of the vanadium slag that obtains can reach more than 5%, and the rate of recovery of vanadium is more than 80%.From the vanadium slag that obtains, can further extract vanadium.
In aforesaid method, so-called oxygen supply blowing is oxygen supply preceding half period of blowing total time in earlier stage.For example, according to embodiments of the invention, can blow 1～5 minute in the early stage of oxygen supply blowing for oxygen supply.
At above-mentioned from vanadium-bearing hot metal the method for vanadium extraction and dephosphorization simultaneously, specifically illustrated four specific embodiments under the different technology conditions below.
Embodiment 1
1) vanadium-bearing hot metal desulfurization: the vanadium-bearing hot metal that blast-furnace smelting goes out, behind desulphurization and slag skimming, obtain containing the vanadium low-sulfur molten iron, its composition is: 4.23%C, 0.16%Si, 0.15%Mn, 0.28%V, 0.010%S, 0.060%P, 0.18%Ti, surplus is Fe, below all be weight percentage, the percentage ratio sum is 100%;
2) dephosphorization vanadium extraction the time: Na successively packs in the 120t converter
2CO
3With contain the vanadium low-sulfur molten iron, the molten iron Intake Quantity is 135t, Na
2CO
3Add-on is 2.5t, then the oxygen supply blowing is carried out in converter; In oxygen supply blowing 1～3 minute, in stove, add the 600kg iron scale as refrigerant;
3) residue adjustment: the oxygen supply blowing added 500kg magnesia and carries out residue adjustment after 5 minutes in stove;
4) half steel and vanadium slag: oxygen supply blowing was carried out pushing off the slag in 0.5～1.0 minute and is gone out half steel and vanadium slag again, and oxygen supply blow end point temperature is 1380 ℃.
The half steel composition that the blowing back obtains is: 3.56%C, Si and Ti content are vestige, 0.03%Mn, 0.014%P, 0.008%S, 0.037%V, and this half steel is applicable to the production of Less Slag Steelmaking in Converter and Clean Steel.The slag rate that obtains vanadium slag is 4.78%, and its main component is: 1.85%CaO, 16.34%Na
2O, 8.93%V
2O
5, 8.75%SiO
2, 3.22%MnO, 8.01%MgO, 25.81%TFe, 27.9%FeO, 6.08%TiO
2, 1.39%P, 0.167%S.
Embodiment 2
1) vanadium-bearing hot metal desulfurization: the vanadium-bearing hot metal that blast-furnace smelting goes out, behind desulphurization and slag skimming, obtain containing the vanadium low-sulfur molten iron, its composition is: 4.42%C, 0.18%Si, 0.14%Mn, 0.24%V, 0.020%S, 0.077%P, 0.22%Ti, surplus is Fe, below all be weight percentage, the percentage ratio sum is 100%;
2) dephosphorization vanadium extraction time the: in 120t converter stove, be blended into and contain vanadium low-sulfur molten iron 140t, then the oxygen supply blowing is carried out in converter; In oxygen supply blowing 1～3 minute, in stove, add 600kg iron scale and Na
2CO
32.5t;
3) residue adjustment: the oxygen supply blowing added 350kg magnesia and carries out residue adjustment after 5 minutes in stove;
4) half steel and vanadium slag: oxygen supply blowing was carried out pushing off the slag in 0.5～1.0 minute and is gone out half steel and vanadium slag again, and oxygen supply blow end point temperature is 1450 ℃.
The half steel composition that oxygen supply blowing back obtains is: 3.45%C, Si and Ti content are vestige, 0.04%Mn, 0.018%P, 0.015%S, 0.029%V, and this half steel is applicable to the production of Less Slag Steelmaking in Converter.The slag rate that obtains vanadium slag is 4.4%, and its main component is: 15.51%CaO, 10.52%V
2O
5, 12.93%SiO
2, 4.14%MnO, 6.03%MgO, 26.94%TFe, 29.27%FeO, 7.24%TiO
2, 1.27%P, 0.258%S.
Embodiment 3
1) low-sulfur molten iron shove charge oxygen supply is blown: the low-sulfur high vanadium ferroalloy piece (water) that adopts electrosmelting to go out carries out vanadium extraction and dephosphorization, this hot metal composition is: 4.08%C, 0.38%Si, 0.43%Mn, 1.24%V, 0.018%S, 0.118%P, 0.46%Ti, surplus is Fe, below all be weight percentage, the percentage ratio sum is 100%; To melt clearly in this molten iron adding medium-frequency induction furnace of 500kg, or the 500kg molten iron is blended in the medium-frequency induction furnace, carry out the oxygen supply blowing;
2) dephosphorization vanadium extraction time the: in 3～5 minutes of oxygen supply blowing, in stove, add 13kg vanadium extraction and dephosphorization agent Na
2CO
3(Na
2CO
3The effect that had both had vanadium extraction and dephosphorization has the effect of refrigerant again, can add refrigerant no longer in addition);
3) get half steel and vanadium slag: oxygen supply 12 minutes total times of blowing, 1380 ℃ of blowing temperature.
The half steel composition that oxygen supply blowing back obtains is: 3.23%C, Si and Ti content are vestige, 0.06%Mn, 0.027%P, 0.013%S, 0.046%V, and this half steel is applicable to that converter or electric furnace adopt few slag process for making to smelt low-phosphorous low-sulfur steel.The slag rate that obtains vanadium slag is 8.7%, and its main component is: 8.35%CaO, 8.48%Na
2O, 14.46%V
2O
5, 9.34%SiO
2, 3.22%MnO, 1.40%MgO, 26.38%Tfe, 8.65%TiO
2, 1.08%P, 0.077%S.
Embodiment 4
1) low-sulfur molten iron shove charge oxygen supply is blown: the low-sulfur high vanadium ferroalloy piece (water) that adopts electrosmelting to go out carries out vanadium extraction and dephosphorization, this hot metal composition is: 4.68%C, 0.30%Si, 0.40%Mn, 2.14%V, 0.018%S, 0.108%P, 0.36%Ti, surplus is Fe, below all be weight percentage, the percentage ratio sum is 100%; Will 500kg this molten iron add in medium-frequency induction furnace molten clearly, or the 500kg molten iron is blended in the medium-frequency induction furnace, blows, magnesia furnace lining, water-cooled single hole spray gun are adopted in blowing;
2) dephosphorization vanadium extraction time the: in 3～5 minutes of oxygen supply blowing, in stove, add 15kg Na
2CO
3With 20kg magnesia;
3) get half steel and vanadium slag: oxygen supply 15 minutes total times of blowing, 1350 ℃ of blowing temperature.
The half steel composition that oxygen supply blowing back obtains is: 3.45%C, Si and Ti content are vestige, 0.1%Mn, 0.020%P, 0.020%S, 0.035%V, and this half steel is applicable to that converter or electric furnace adopt few slag process for making to smelt low-phosphorous low-sulfur steel.The slag rate that obtains vanadium slag is 10.5%, and its main component is: 10.15%CaO, 0.50%Na
2O, 24.32%V
2O
5, 11.53%SiO
2, 3.20%MnO, 7.48%MgO, 28.85%Tfe, 11.05%TiO
2, 1.38%P, 0.050%S.
From above-mentioned four embodiment as can be seen, the vanadium extraction and dephosphorization of vanadium-bearing hot metal can carry out in converter (embodiment 1 and embodiment 2) or electric furnace (embodiment 3 and embodiment 4).
The dephosphorizing agent converter of can packing into be blended into molten iron in converter before in the early stage that also can begin the oxygen supply blowing after molten iron is blended into, adds dephosphorizing agent in the molten iron.Embodiment 1 showed be blended into molten iron in converter before the situation of converter that dephosphorizing agent packed into, and embodiment 2 to embodiment 4 shows in oxygen supply blowing early stage dephosphorizing agent is added situation in the molten iron.In embodiment 1 to embodiment 4, dephosphorizing agent is Na
2CO
3, and add-on is 5～50kg/tFe.
In the process of vanadium extraction and dephosphorization, the purpose that adds magnesia is to protect furnace lining.Yet because in the vanadium extraction and dephosphorization process, magnesia can participate in the vanadium extraction reaction on a small quantity, forms the vanadium magnesia spinel, add-on is too much unfavorable to vanadium extraction and dephosphorization, so the add-on of magnesia should be controlled to be 0～40kg/tFe.
The method of while vanadium extraction and dephosphorization from vanadium-bearing hot metal according to the embodiment of the invention not only can guarantee the extraction of vanadium, and can remove the phosphorus content in the molten iron effectively, has alleviated the dephosphorization pressure of steel making working procedure greatly.
Therefore, the process for making of utilization method of while vanadium extraction and dephosphorization from vanadium-bearing hot metal has the advantages that flow process is short, energy consumption is low, dephosphorization rate is high, can guarantee the effective extraction and the recovery of the valuable element vanadium in the molten iron, improved the half steel quality simultaneously, for the production of Clean Steel, Clean Steel and low-phosphorous low-sulfur steel provides good raw material.
Though shown specific embodiments of the invention, under the situation that does not break away from spirit of the present invention and principle, can make embodiment and revising and distortion.Scope of the present invention is defined by the claims.
Claims (10)
1. the method for a vanadium extraction and dephosphorization from vanadium-bearing hot metal, described method comprises: in the process of vanadium-bearing hot metal being carried out the oxygen supply blowing, add vanadium extraction and dephosphorization agent and refrigerant in described molten iron, the blowing back obtains vanadium slag and low-phosphorous half steel.
2. method according to claim 1 before described oxygen supply blowing beginning, is added vanadium extraction and dephosphorization agent, and add refrigerant in described oxygen supply was blown 1～5 minute in described molten iron.
3. method according to claim 1 in described oxygen supply blowing 1～5 minute, is added vanadium extraction and dephosphorization agent and refrigerant simultaneously in described molten iron.
4. according to claim 2 or 3 described methods, the oxygen supply duration of blast is 3.0～20.0 minutes, and the terminal temperature of oxygen supply blowing is 1300～1500 ℃.
5. according to claim 2 or 3 described methods, described vanadium extraction and dephosphorization agent is Na
2CO
3And add-on is 5～50kg/tFe, and described refrigerant is that iron scale and add-on are 0～30kg/tFe.
6. the process for making of a vanadium extraction and dephosphorization from vanadium-bearing hot metal, this technology comprises:
Pack into blast furnace or electric furnace of the iron ore that will contain vanadium smelted, vanadium-bearing hot metal;
Vanadium-bearing hot metal is carried out desulfurization to be handled;
The vanadium extraction and dephosphorization when vanadium-bearing hot metal after the desulfurization is carried out the oxygen supply blowing obtains vanadium slag and low-phosphorous low-sulfur half steel;
From vanadium slag, extract vanadium, and low-phosphorous low-sulfur half steel be used to smelt low-phosphorous low-sulfur steel,
Wherein, the described step that vanadium-bearing hot metal after the desulfurization is carried out oxygen supply blowing time vanadium extraction and dephosphorization comprises: in the process of the low-sulfur vanadium-bearing hot metal being carried out the oxygen supply blowing, add vanadium extraction and dephosphorization agent and refrigerant in described molten iron, the blowing back obtains vanadium slag and low-phosphorous half steel.
7. method according to claim 8 before described oxygen supply blowing beginning, is added vanadium extraction and dephosphorization agent, and add refrigerant in described oxygen supply was blown 1～5 minute in described molten iron.
8. method according to claim 8 in described oxygen supply blowing 1～5 minute, is added vanadium extraction and dephosphorization agent and refrigerant simultaneously in described molten iron.
9. according to claim 9 or 10 described methods, the oxygen supply duration of blast is 3.0～20.0 minutes, and the terminal temperature of oxygen supply blowing is 1300～1500 ℃.
10. according to claim 9 or 10 described methods, described dephosphorizing agent is Na
2CO
3And add-on is 5～50kg/tFe, and described refrigerant is that iron scale and add-on are 0～30kg/tFe.
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| CN102605231A (en) * | 2011-12-22 | 2012-07-25 | 内蒙古科技大学 | Method for smelting niobium steel and vanadium steel |
| CN102605231B (en) * | 2011-12-22 | 2014-05-14 | 内蒙古科技大学 | Method for smelting niobium steel and vanadium steel |
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