CN103820597B - Efficient utilization method of residual vanadium in semisteel - Google Patents
Efficient utilization method of residual vanadium in semisteel Download PDFInfo
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- CN103820597B CN103820597B CN201410057754.0A CN201410057754A CN103820597B CN 103820597 B CN103820597 B CN 103820597B CN 201410057754 A CN201410057754 A CN 201410057754A CN 103820597 B CN103820597 B CN 103820597B
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Abstract
The invention discloses an efficient utilization method of residual vanadium in semisteel. According to the method, the semisteel after pre-treatments is used for steelmaking; a low-valence reducing agent is added to a slag liquid level of the semisteel in a converter at a smelting terminal point; nitrogen is sprayed into the converter by using an oxygen lance; and after the nitrogen is completely sprayed, the steel can be tapped when the reaction in the converter is calm. The semisteel after desulfurization, desiliconization and dephosphorization is used for steelmaking, thereby realizing less slag steelmaking in the converter. The low-valence reducing agent is added to the slag liquid level in a converter from an overhead bunker at the smelting terminal point; nitrogen is sprayed into the converter by using the oxygen lance to be used as a power source; stirring of the slag and the reducing agent is strengthened at the smelting terminal point in the converter, so as to meet dynamic conditions of a reducing reaction and promote a process of a vanadium reduction reaction, so that vanadium in the slag can enter into the steel again. The vanadium content at the he smelting terminal point in the converter is obviously increased by about 0.020% in average; the object of vanadium-increasing of molten steel is achieved, thereby reducing usage amount of vanadium alloy, realizing efficient utilization of the residual vanadium in the semisteel and reducing alloy cost in smelting vanadium-containing steel.
Description
Technical field
The invention belongs to metallurgical steelmaking technical field, the Efficient utilization method of remaining vanadium in especially a kind of half steel.
Background technology
Vanadium titanium elements is the important element of microalloyed steel, has significant impact to the performance of microalloyed steel.In molten iron, content of vanadium is 0.20 ~ 0.35%(mean value 0.28%), titanium content is 0.20 ~ 0.60%(mean value 0.35%).The oxidation ratio of vanadium extraction by converter blowing process vanadium is probably 85%, remaining content of vanadium on average about about 0.040% in semi-steel after extraction of vanadium, the vanadium overwhelming majority after steel making working procedure in half steel is oxidized to be entered in slag, in molten steel, remaining vanadium is only 0.003 ~ 0.010%, cause V element in half steel can not obtain abundant efficiency utilization, cause the waste of vanadium and titanium resources.
Under existing process for making, steelmaking process is oxidizing atmosphere all the time, in converting process, remaining vanadium in semi steel major part is oxidized enters into slag, according to the mechanical analysis of the vanadium heat of oxidation, in blow end point slag, vanadium cannot carry out reverse reduction and enters molten steel in stove internal oxidition atmosphere, wants from the V slag
2o
5in restore the reductive agent that vanadium must add q.s in slag, but also the dynamic conditions of demand fulfillment reduction reaction.If can the vanadium in slag be reverted back in molten steel before tapping, when smelting V-alloyed steel, just can reduce the usage quantity of vanadium alloy, greatly can reduce the cost producing V-alloyed steel.
Summary of the invention
The technical problem to be solved in the present invention is to provide the Efficient utilization method of remaining vanadium in a kind of half steel, to be retained in molten steel by the vanadium in half steel.
For solving the problems of the technologies described above, the technical solution used in the present invention is: adopt three de-rear semi-steel makings, it adds reductive agent at a low price at converter smelting endpoint to converter slag liquid level, then utilizes oxygen rifle to nitrogen-blow in converter, nitrogen injection terminates, and can tap after reaction in furnace calmness.
Low price reductive agent of the present invention is coke powder or steel-smelting carburant.Described low price reductive agent add-on is 1 ~ 4kg/t steel.
Nitrogen pressure of the present invention is 1.0 ~ 1.6MPa, and nitrogen flow is 20000 ~ 40000m
3/ h, service life 20 ~ 60 seconds.The described oxygen lance position vertical range of liquid steel level (in the oxygen lance blow head to converter) controls at 2.0 ~ 8.0 meters.
Half steel of the present invention or the vanadium-bearing hot metal of smelting half steel at a low price carry out three de-process before reductive agent adding, and control in 0.050%, reduce reduction V by phosphorus content in half steel
2o
5the rephosphorization that process causes, realizes less-slag operation.
The present invention is mainly by the de-rear semi-steel making of employing three, realize Less Slag Steelmaking in Converter, add reductive agent at a low price from high hopper to slag liquid level in converter when converter smelting endpoint, and utilize oxygen rifle to nitrogen-blow in converter, this technique passes through oxygen rifle to nitrogen-blow in converter as propulsion source, add strong mixing converter smelting endpoint slag and reductive agent, to meet the dynamic conditions of reduction reaction, promote reaction: (V
2o
5) the carrying out of+5 [C]=2 [V]+5CO (g), make vanadium in slag reenter in steel, reach the object that molten steel increases vanadium.Research finds all V to occur in 1450 DEG C ~ 1600 DEG C temperature ranges
2o
5reduction reaction, temperature is to V
2o
5reduction reaction obvious effect, high temperature is conducive to the carrying out of reduction reaction.The reduction process of vanadium is a complicated heterogeneous reaction process, (V
2o
5) representative reaction formula that+5 [C]=2 [V]+5CO (g) are vanadium reduction reaction, converter smelting endpoint molten steel temperature is generally at about 1650 DEG C, and the trend of reduction reaction is more obvious at such a temperature.
The beneficial effect adopting technique scheme to produce is: the present invention adds reductive agent at a low price in the converter of tapping forward direction, v element in slag can be made before tapping to be reduced from barium oxide and to enter molten steel, reach the object that molten steel increases vanadium, thus the usage quantity of vanadium alloy can be reduced, realize the efficiency utilization of the remaining vanadium of half steel, reduce cost of alloy when smelting V-alloyed steel.Described low price reductive agent can be selected coke powder or meet the steel-smelting carburant of YB/T 192-2001 standard, has the advantages that raw material is cheap, be easy to get.
The present invention is molten iron " three take off ", i.e. desulfurization, desiliconization, dephosphorization, thus by harmful element, when particularly phosphorus ligands falls more than half, coordinate half steel less-slag operation, determine reductive agent kind, add-on, add opportunity and recovery time, grope optimised process, while minimizing reductive agent add-on, greatly will improve V
2o
5reduction ratio, and the harm that rephosphorization causes molten steel can be reduced.
Accompanying drawing explanation
Below in conjunction with the drawings and specific embodiments, the present invention is further detailed explanation.
Fig. 1 is process flow diagram of the present invention;
Fig. 2 is the comparison diagram of content of vanadium in steel before and after present invention process is implemented.
Embodiment
Shown in embodiment 1: Fig. 1, in this half steel, the Efficient utilization method of remaining vanadium adopts following processing step.
After vanadium-bearing hot metal is de-through three, in half steel, phosphorus content is 0.046%, steel-making converter smelting endpoint molten steel composition is C 0.06%, Si 0.01%, Mn 0.04%, P 0.012%, S 0.021%, V 0.004%, in molten steel, nitrogen content is 9ppm, and in slag, FeO content is 18.2%, and blow end point adds coke powder 3.7kg/t steel (namely adding 3.7kg coke powder in steel per ton) by high hopper in converter, oxygen rifle is utilized to carry out nitrogen flushing operation after adding coke powder, control of lance position is at 5.5m, and nitrogen pressure is 1.5Mpa, nitrogen flow 38000m
3/ h, 40 seconds nitrogen flushing time, nitrogen flushing terminates rear converter and leaves standstill tapping in 30 seconds.After adopting present method, molten steel composition is C 0.06%, Si 0.01%, Mn 0.04%, P 0.013%, S 0.021%, V 0.025%, and in molten steel, nitrogen content is 9ppm, and in slag, FeO content is 10.5%.
Embodiment 2: in this half steel, the Efficient utilization method of remaining vanadium adopts following processing step.
After vanadium-bearing hot metal is de-through three, in half steel, phosphorus content is 0.042%, steel-making converter smelting endpoint molten steel composition is C 0.08%, Si 0.01%, Mn 0.05%, P 0.009%, S 0.018%, V 0.006%, in molten steel, nitrogen content is 8ppm, and in slag, FeO content is 15.6%, and blow end point adds natural graphite carburelant 3.5kg/t steel by high hopper in converter, oxygen rifle is utilized to carry out nitrogen flushing operation after adding natural graphite carburelant, control of lance position is at 6.3m, and nitrogen pressure is 1.5Mpa, nitrogen flow 20000m
3/ h, 20 seconds nitrogen flushing time, nitrogen flushing terminates rear converter and leaves standstill tapping in 30 seconds.After adopting present method, molten steel composition is C 0.08%, Si 0.01%, Mn 0.05%, P 0.011%, S 0.018%, V 0.028%, and in molten steel, nitrogen content is 9ppm, and in slag, FeO content is 9.8%.
Embodiment 3: in this half steel, the Efficient utilization method of remaining vanadium adopts following processing step.
After vanadium-bearing hot metal is de-through three, in half steel, phosphorus content is 0.037%, and steel-making converter smelting endpoint molten steel composition is C 0.08%, Si 0.01%, Mn 0.04%, P 0.009%, S 0.020%, V 0.006%, in molten steel, nitrogen content is 8ppm, and in slag, FeO content is 14.2%, and blow end point is added in converter by high hopper forges coal carburelant 2.7kg/t steel, adding after forging coal carburelant utilizes oxygen rifle to carry out nitrogen flushing operation, control of lance position is at 4.5m, and nitrogen pressure is 1.4Mpa, nitrogen flow 36000m
3/ h, 50 seconds nitrogen flushing time, nitrogen flushing terminates rear converter and leaves standstill tapping in 45 seconds.After adopting present method, molten steel composition is C 0.08%, Si 0.01%, Mn 0.05%, P 0.009%, S 0.021%, V 0.026%, and in molten steel, nitrogen content is 9ppm, and in slag, FeO content is 10.3%.
Embodiment 4: in this half steel, the Efficient utilization method of remaining vanadium adopts following processing step.
After vanadium-bearing hot metal is de-through three, in half steel, phosphorus content is 0.048%, and steel-making converter smelting endpoint molten steel composition is C 0.06%, Si 0.01%, Mn 0.05%, P 0.010%, S 0.019%, V 0.005%, in molten steel, nitrogen content is 9ppm, and in slag, FeO content is 16.8%, and blow end point adds greying carburelant 1.0kg/t steel by high hopper in converter, oxygen rifle is utilized to carry out nitrogen flushing operation after adding greying carburelant, control of lance position is at 2.0m, and nitrogen pressure is 1.00Mpa, nitrogen flow 28000m
3/ h, 60 seconds nitrogen flushing time, nitrogen flushing terminates rear converter and leaves standstill tapping in 60 seconds.After adopting present method, molten steel composition is C 0.06%, Si 0.01%, Mn 0.05%, P 0.010%, S 0.020%, V 0.021%, and in molten steel, nitrogen content is 10ppm, and in slag, FeO content is 10.5%.
Embodiment 5: in this half steel, the Efficient utilization method of remaining vanadium adopts following processing step.
After vanadium-bearing hot metal is de-through three, in half steel, phosphorus content is 0.040%, and steel-making converter smelting endpoint molten steel composition is C 0.07%, Si 0.01%, Mn 0.04%, P 0.011%, S 0.020%, V 0.004%, in molten steel, nitrogen content is 8ppm, and in slag, FeO content is 15.6%, and blow end point adds metallurgical coke carburelant 4.0kg/t steel by high hopper in converter, oxygen rifle is utilized to carry out nitrogen flushing operation after adding metallurgical coke carburelant, control of lance position is at 8.0m, and nitrogen pressure is 1.60Mpa, nitrogen flow 40000m
3/ h, 30 seconds nitrogen flushing time, nitrogen flushing terminates rear converter and leaves standstill tapping in 20 seconds.After adopting present method, molten steel composition is C 0.07%, Si 0.01%, Mn 0.04%, P 0.013%, S 0.020%, V 0.023%, and in molten steel, nitrogen content is 9ppm, and in slag, FeO content is 10.0%.
Fig. 2 is present method technique (implement after) and the contrast schematic diagram of content of vanadium in former Semi-steel making method (before enforcement) gained molten steel.By above-described embodiment and Fig. 2 visible, after adopting present method, in molten steel, content of vanadium can reach 0.023% ~ 0.030%, can not add or add less when smelting V-alloyed steel the requirement that vanadium iron just can reach content of vanadium in V-alloyed steel, present method is implemented content of vanadium in rear converter smelting endpoint steel and is obviously increased, on average increase about 0.020%, V 0.020% is increased according in calculating steel, need 50 vanadium iron 0.45Kg/t steel, present method can make remaining vanadium in half steel obtain efficiency utilization, effectively reduces cost of alloy when smelting V-alloyed steel.
Claims (3)
1. the Efficient utilization method of remaining vanadium in a half steel, adopt three de-rear semi-steel makings, it is characterized in that: phosphorus content in half steel is controlled in 0.050%, reductive agent coke powder or steel-smelting carburant is at a low price added to converter slag liquid level at converter smelting endpoint, then utilize oxygen rifle to nitrogen-blow in converter, described nitrogen pressure is 1.0 ~ 1.6MPa, and nitrogen flow is 20000 ~ 40000m
3/ h, service life 20 ~ 60 seconds, nitrogen injection terminates, and can tap after reaction in furnace calmness.
2. the Efficient utilization method of remaining vanadium in half steel according to claim 1, is characterized in that: described low price reductive agent add-on is 1 ~ 4kg/t steel.
3. the Efficient utilization method of remaining vanadium in half steel according to claim 1 and 2, is characterized in that: described control of lance position is at 2.0 ~ 8.0 meters.
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| CN104480243A (en) * | 2014-12-09 | 2015-04-01 | 河北钢铁股份有限公司承德分公司 | Method for reducing TFe in vanadium extraction slag by use of coke |
| CN112760443B (en) * | 2020-12-16 | 2022-06-28 | 河钢股份有限公司承德分公司 | Control method for converter steelmaking of low-vanadium molten iron and application thereof |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU1068495A1 (en) * | 1982-10-18 | 1984-01-23 | Чусовской металлургический завод | Method for smelting vanadium alloys |
| CN1215090A (en) * | 1998-11-02 | 1999-04-28 | 承德钢铁集团有限公司 | Vanadium pellet for steel smelting and alloyage process thereof |
| CN102304604A (en) * | 2011-08-31 | 2012-01-04 | 河北钢铁股份有限公司承德分公司 | Smelting technology of III grade hot-rolled ribbed bars |
| CN102796938A (en) * | 2012-08-25 | 2012-11-28 | 武钢集团昆明钢铁股份有限公司 | Method for increasing vanadium content of molten steel |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU1068495A1 (en) * | 1982-10-18 | 1984-01-23 | Чусовской металлургический завод | Method for smelting vanadium alloys |
| CN1215090A (en) * | 1998-11-02 | 1999-04-28 | 承德钢铁集团有限公司 | Vanadium pellet for steel smelting and alloyage process thereof |
| CN102304604A (en) * | 2011-08-31 | 2012-01-04 | 河北钢铁股份有限公司承德分公司 | Smelting technology of III grade hot-rolled ribbed bars |
| CN102796938A (en) * | 2012-08-25 | 2012-11-28 | 武钢集团昆明钢铁股份有限公司 | Method for increasing vanadium content of molten steel |
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