CN103173676A - Method for generating nitrogenous ferrovanadium alloy through utilizing ferrovanadium electric-arc furnace - Google Patents
Method for generating nitrogenous ferrovanadium alloy through utilizing ferrovanadium electric-arc furnace Download PDFInfo
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Abstract
The invention discloses a method for generating nitrogenous ferrovanadium alloy through utilizing a ferrovanadium electric-arc furnace, and belongs to the technical field of non-ferrous metal metallurgy. The method is characterized in that a single or more nitrogen/argon blowing devices are installed on the furnace bottom or the furnace wall of the ferrovanadium electric-arc furnace with the general nominal capacity of 300-5000kg and can freely blow nitrogen/argon into a ferrovanadium electric-arc furnace hearth, selected raw materials are used, and finally, the nitrogenous ferrovanadium alloy with 45-60% of V, less than 2% of Si and 2-8% of N can be obtained and can be used as a steel additive. Compared with common ferrovanadium, according to the nitrogenous ferrovanadium alloy, the alloy usage can be reduced above 10%, the vanadium yield is increased by 1%, the melting period is shortened by above 30 minutes, the melting power consumption is reduced by 10-15%, and the comprehensive melting cost is lowered by above 2%.
Description
Technical field
The present invention relates to a kind of method of using common vanadium iron electric arc furnace to produce nitrogenous ferro-vanadium, belong to the non-ferrous metal metallurgy technical field, is a kind of iron alloy production method.
Technical background
Vanadium is a kind of important alloying element in Iron And Steel Industry, and the vanadium of the whole world more than 85% is used for Iron and Steel Production, and vanadium interacts with the element such as nitrogen in steel can play the effect that improves the many performances of steel.
The vanadium raw materials that contains that uses in Iron And Steel Industry mainly contains vanadium iron, vanadium nitride, ferrovanadium nitride etc.
Its major ingredient of ferro-vanadium is vanadium and iron, is the vanadium goods of output maximum.The vanadium iron electric arc furnace is generally used in vanadium iron production, take barium oxide as raw material, according to method productions such as silicothermic process, thermite process or electro-aluminothermic processes.
Its main component of vanadium nitride is VN, it produces general pushed bat kiln method, microwave method or the vacuum carbon reduction method used, pressure ball after barium oxide raw material and auxiliary material are mixed according to certain formula reduces in the environment of rich nitrogen under solid-state, nitrogenize, through cooling acquisition vanadium nitride product.
Ferrovanadium nitride is take vanadium iron as raw material, and secondary nitriding processing obtains the ferrovanadium nitride of rich nitrogen, the self-diffusion high-temperature synthesis of the ferrovanadium nitride production method solid State Nitriding method that mainly contains in actual applications and nitriding in sintering process etc.
When the nitrogenous vanadium goods such as vanadium nitride and ferrovanadium nitride use as steel additive agent, because the effect of nitrogen element, often obtain than the better result of use of common vanadium iron and vanadium consumption still less.The production technology threshold of existing vanadium nitride or ferrovanadium nitride is higher, and adopts in a large number the method for solid State Nitriding, and production efficiency and output are lower, and production energy consumption is higher, and common vanadium iron remains the vanadium product of output maximum.How transforming common vanadium iron electric arc furnace produces nitrogenous ferro-vanadium and is the content that the present invention relates to.
Summary of the invention
Target of the present invention is to propose the common vanadium iron electric arc furnace of a kind of transformation and produces nitrogenous ferro-vanadium method.
The agent set of smelting ferrovanadium alloy is the vanadium iron electric arc furnace, its nominal capacity is generally 300～5000kg, adopts three-phase electrode for electrically heated, and transformer capacity is generally 300～3000KVA, body of heater adopts magnesia brick to build by laying bricks or stones or the magnesia knotting, and bell uses magnesia chrome brick or high alumina brick to build by laying bricks or stones.The raw material of vanadium iron electric arc furnace smelting ferro-vanadium is that (main component is V to the Vanadium Pentoxide in FLAKES fuse piece
2O
5), ferrosilicon, metallic aluminium (ferrosilicoaluminum), unslaked lime and steel scrap, smelting cycle is 2～6 hours, melting electric consumption is greater than 1200kwh/t.
In the vanadium iron smelting process, main chemical reactions is as follows:
V
2O
5+Si+CaO→V+(CaO)·(SiO
2)
V
2O
5+Al→V+(Al
2O
3)
The chemical reaction process heat absorption needs electric energy supplement.Through reduction and refining, finally can obtain to contain vanadium and surpass 40% ferro-vanadium, the highest vanadiumcontent can reach 70% left and right.
Traditional electric arc furnace is produced in the ferro-vanadium process, vanadium metal all exists with molten state, forms vanadium iron liquid and is present in bottom, electric arc furnace molten bath, and the liquid slag that reduction reaction produces covers vanadium iron liquid, can prevent air to the oxidation of vanadium iron, also stop simultaneously the infiltration of airborne nitrogen in the vanadium iron.
According to calculation of thermodynamics
The nitrogenize of vanadium is thermopositive reaction, and along with the rising of temperature, the generation degree of vanadium nitride is lower, and along with the rising of pressure, the generation degree of vanadium nitride is higher.
In electric arc furnace smelting ferro-vanadium process, in stove, temperature surpasses 1500 ℃, reaches as high as 1700 ℃ of left and right, can't realize the complete nitrogenize of v element under this temperature normal pressure nitrogen atmosphere.
Osmotic equilibrium reaction to nitrogen in high temperature vanadium iron liquid is calculated, under the normal pressure nitrogen atmosphere, in the vanadium iron liquid (containing [V] 50%) under 1700 ℃, the nitrogen budgets massfraction is 8.0% left and right, as accompanying drawing 1, the v element nitriding rate is about 70% left and right, referred to herein as nitrogenous vanadium iron.
Say on driven mechanics simultaneously, in the production process of vanadium iron in electric arc furnace, whole chemical reaction is all to carry out between the iron liquid of melting and slag, has mobility preferably, and dynamic conditions is better, i.e. reaction is the easy to reach equilibrium state relatively.Adopting nitrogen to carry out liquid nitriding in vanadium iron liquid compares the nitriding treatment time and will greatly shorten with the solid nitriding.
According to theoretical study results, common vanadium iron electric arc furnace production process furnace inner environment can satisfy the condition of nitriding in the vanadium iron liquid, but the covering of molten slag has stoped by the approach of air to the molten bath nitriding.
In order to realize that the vanadium iron electric arc furnace produces nitrogenous ferro-vanadium, what must solve is to realize stable nitrogen supply (NS) in the electric arc furnace molten bath.Size according to capacity of electric arc furnace, at the bottom of arc furnace or the furnace wall single or branched nitrogen/argon blowing device are installed, nitrogen/argon blowing device adopts the mode of metal ring slit-tube or refractory materials slit gas permeable brick to design, itself and external control valve assembly are closed, can realize free nitrogen-blow and argon gas in the vanadium iron electric arc furnace molten bath, the Gas injection flow control scope of single nitrogen/argon blowing device is 20～500NL/min.
When nitrogen/argon blowing device adopts at the bottom of arc furnace mounting means, according to the difference of device quantity, generally, evenly install according to concentric or eccentric manner.
In the present invention, use electric arc furnace to produce the needed solid material of nitrogenous ferro-vanadium and be Vanadium Pentoxide in FLAKES fuse piece, ferrosilicon, metallic aluminium (ferrosilicoaluminum), unslaked lime and steel scrap, gas raw material is nitrogen and argon gas, the composition of various raw materials, specification requirement such as following table 1:
Table 1 ingredient requirement table
The present invention produces nitrogenous ferro-vanadium, and the smelting process in electric arc furnace is carried out in two steps.The first step is to stir reduction period, with ferrosilicon and metallic aluminium reduction Vanadium Pentoxide in FLAKES, obtains the vanadium ferro-silicon of high silicon under the condition that Argon stirs; Second step is the refining nitrogen pick-up phase, with excessive Vanadium Pentoxide in FLAKES refining vanadium ferro-silicon, reduces silicone content, continues simultaneously nitrogen-blow nitrogen pick-up, finally obtains nitrogenous ferro-vanadium.Smelting process is as follows in detail:
1) after a upper stove taps a blast furnace, fettling;
2) add the needed whole steel scraps of production;
3) open nitrogen/argon blowing device, blowing gas is argon gas, and single-point winding-up flow is 20～200NL/min:
4) begin energising, and the rich vanadium slag of the refining of a upper stove is returned in stove;
5) stir reduction period and begin, generally be divided into two or three phases in the stirring reduction period, be divided into two or three parts with smelting required Vanadium Pentoxide in FLAKES fuse piece, ferrosilicon, lime and metallic aluminium, distribute by the stage, in per stage, operating process is identical.In the stirring reduction period, nitrogen/argon blowing device continues winding-up Ar gas, agitation molten pool, and guarantee that gas circuit is unobstructed.
Stirring the interior every stages operating process of reduction period is: improve Ar gas blowout wind drift amount, the single-point flow reaches 100～500NL/min; Add all Vanadium Pentoxide in FLAKES fuse pieces of this stage, lime and 60 ?80% ferrosilicon, bring into use the power supply of transformer lowest gear; Along with the fusing of raw material, progressively improve the power supply gear; After the molten bath forms, use high tap position power supply, furnace charge is melted rapidly; Until raw material molten clear after, the power supply gear reduces by one or second gear, adds remaining ferrosilicon, then adds the V in the aluminium reducing slag
2O
5, keep Ar gas blowout wind drift amount, fully agitation molten pool; (V in slag
2O
5During)＜0.35%, it is 20～200NL/min that the single-point flow is blown in reduction Ar gas blowout, claws poor vanadium slag; Preparation enters next stage.
Through two or three phases, when stirring the reduction period end, in electric arc furnace, the composition of vanadium ferro-silicon liquid is: [V] 40～50%, [Si] 8～10% surpluses are Fe.
6) after the stirring reduction period finished, the refining nitriding phase began.The compound that adds Vanadium Pentoxide in FLAKES fuse piece and lime; Blowing gas switches to nitrogen by argon gas, improve simultaneously the winding-up flow, single Zhi Liuliang is set as 100～500NL/min, utilizes gas stirring power mixing molten bath, reduces in stove the silicon in the vanadium ferro-silicon and improves content of vanadium, nitrogen penetrates into the molten bath, form the vanadium nitrogen compound, in final electric arc furnace, the composition of nitrogenous vanadium iron liquid is: [V] 45～60%, [Si]＜2%, [N]〉2%, surplus is Fe.
7) composition qualified after, reduce the nitrogen-blow flow, single Zhi Liuliang is set as 20～100NL/min, and slag iron is fully separated, and claws the rich vanadium slag of refining stand-by;
8) nitrogenous ferro-vanadium is cast into ingot mould, and naturally cooling under nitrogen protection obtains the finished product.
The present invention utilizes Production Flow Chart that the electric arc furnace of transformation produces nitrogenous ferro-vanadium as shown in Figure 2.
Nitrogen/argon blowing device is optimized nitrogenous ferro-vanadium smelting production process in electric arc furnace by nitrogen-blow, argon gas.Stir and pass through the winding-up argon gas in reduction period, in the molten bath, slag iron fully mixes, and has improved the vanadium reduction rate, reduces the V in slag
2O
5Content; In the refining nitriding phase, the stirring action of nitrogen has been accelerated the speed that removes of silicon, and in nitriding process, the exothermic heat of reaction of nitrogen element and v element heats up for the molten bath thermal source is provided, and has reduced melting electric consumption.
Use the present invention to smelt nitrogenous ferro-vanadium and compare with producing common vanadium iron, the v element recovery rate improves 1%, and smelting cycle shortened more than 30 minutes, and melting electric consumption reduces by 10～15%, smelts comprehensive cost and reduces more than 2%.
The nitrogenous ferro-vanadium that uses the present invention to produce, its composition is [V] 45～60%, [Si]＜2%, [N] 2～8%, alloy density is high, uses as steel additive agent, compares with common vanadium iron, can reduce the alloy consumption more than 10%.
Description of drawings
Fig. 1 be Fe ?N ?V ternary phase diagrams (1973K).
Fig. 2 is the production scheme that electric arc furnace of the present invention is produced nitrogenous ferro-vanadium.
Embodiment
Application example 1
Take certain 500kg vanadium iron electric arc furnace as example, transform according to the inventive method, for the production of nitrogenous ferro-vanadium.1 furnace bottom nitrogen/argon blowing device is installed, blowing device adopts the structure of refractory materials slit gas permeable brick, blowing device and external control valve assembly are closed, freely switch nitrogen-blow and argon gas in vanadium iron electric arc furnace molten bath, the Gas injection flow range of single nitrogen/argon blowing device is 20～200NL/min.
It is Vanadium Pentoxide in FLAKES fuse piece, ferrosilicon, metallic aluminium, unslaked lime, steel scrap, nitrogen and argon gas that electric arc furnace is produced the needed raw material of nitrogenous ferro-vanadium.
This electric arc furnace is produced nitrogenous ferro-vanadium and is mainly carried out in two steps, stirs reduction period and refining nitrogen pick-up phase, wherein stirs to be divided into two stages in reduction period and to carry out, and production process is as follows in detail:
1) after a upper stove taps a blast furnace, fettling;
2) add the needed whole steel scraps of production;
3) open nitrogen/argon blowing device, blowing gas is argon gas, and single-point winding-up flow is 20～50NL/min:
4) begin energising, and the rich vanadium slag of the refining of a upper stove is returned in stove;
5) stir reduction period and begin, stir reduction period and be divided into two stages, needed Vanadium Pentoxide in FLAKES fuse piece, ferrosilicon, lime and metallic aluminium are divided into two parts.In the stirring reduction period, keep winding-up Ar gas agitating molten bath always.
Stirring the interior every stages operating process of reduction period is: improve Ar gas blowout wind drift amount, the single-point flow reaches 100～200NL/min; Add all Vanadium Pentoxide in FLAKES fuse pieces of this stage, lime and most of ferrosilicon, the small power power supply; After the molten bath formed, the full load power supply was melted rapidly furnace charge; Molten clear rear suitably reduction for electric strength, adds remaining ferrosilicon, then adds the V in the aluminium reducing slag
2O
5, keep Ar gas blowout wind drift amount, fully agitation molten pool; (V in slag
2O
5During)＜0.35%, it is 20～50NL/min that the single-point flow is blown in reduction Ar gas blowout, claws poor vanadium slag; Preparation enters next stage.
Through two or three phases, when stirring reduction period and finishing, in electric arc furnace, the composition of vanadium ferro-silicon liquid is: [V] 40～50%, [Si] 8～10%.
6) after the stirring reduction period finished, the refining nitriding phase began.The compound that adds Vanadium Pentoxide in FLAKES fuse piece and lime; Blowing gas switches to nitrogen by argon gas, improve simultaneously the winding-up flow, the single-point flow is 100～200NL/min, utilize gas stirring power mixing molten bath, reduce in stove the silicon in the vanadium ferro-silicon and improve content of vanadium, nitrogen penetrates into the molten bath, form the vanadium nitrogen compound, in final electric arc furnace, the composition of nitrogenous vanadium iron liquid is: [V] 45～60%, [Si]＜2%, [N]〉2%;
7) composition qualified after, reduce the nitrogen-blow flow, the single-point flow is 20～50NL/min, and slag iron is fully separated, and claws the rich vanadium slag of refining stand-by;
8) nitrogenous ferro-vanadium is cast into ingot mould, and naturally cooling under nitrogen protection obtains the finished product.
This vanadium iron electric arc furnace uses the present invention to produce nitrogenous ferro-vanadium, and its composition is [V] 45～60%, [Si]＜2%, [N] 2～8% compares with the vanadium iron technique that original production is common, and the v element recovery rate improves 1%, smelting cycle shortens 30 minutes, and melting electric consumption reduces by 10%, smelts comprehensive cost and reduces by 2%.
Application example 2
Take certain 5000kg vanadium iron electric arc furnace as example, transform according to the inventive method, for the production of nitrogenous ferro-vanadium.5 furnace wall nitrogen/argon blowing devices are installed, blowing device adopts metal ring slit-tube structure, blowing device and external control valve assembly are closed, and freely switch nitrogen-blow and argon gas in vanadium iron electric arc furnace molten bath, and the Gas injection flow control scope of single nitrogen/argon blowing device is 50～500NL/min.
It is Vanadium Pentoxide in FLAKES fuse piece, ferrosilicon, metallic aluminium, unslaked lime, steel scrap, nitrogen and argon gas that electric arc furnace is produced the needed raw material of nitrogenous ferro-vanadium.
This electric arc furnace is produced nitrogenous ferro-vanadium and was mainly divided for two steps carried out, and stirs reduction period and refining nitrogen pick-up phase, wherein stirs to be divided into three phases in reduction period and to carry out, and production process is as follows in detail:
1) after a upper stove taps a blast furnace, fettling;
2) add the needed whole steel scraps of production;
3) open nitrogen/argon blowing device, blowing gas is argon gas, and single-point winding-up flow is 50～200NL/min:
4) begin energising, and the rich vanadium slag of the refining of a upper stove is returned in stove;
5) stir reduction period and begin, stir reduction period and be divided into three phases, needed Vanadium Pentoxide in FLAKES fuse piece, ferrosilicon, lime and metallic aluminium are divided into three parts.In the stirring reduction period, keep winding-up Ar gas agitating molten bath always.
Stirring the interior every stages operating process of reduction period is: improve Ar gas blowout wind drift amount, the single-point flow reaches 200～500NL/min; Add all Vanadium Pentoxide in FLAKES fuse pieces of this stage, lime and most of ferrosilicon, the small power power supply; After the molten bath formed, the full load power supply was melted rapidly furnace charge; Molten clear rear suitably reduction for electric strength, adds remaining ferrosilicon, then adds the V in the aluminium reducing slag
2O
5, keep Ar gas blowout wind drift amount, fully agitation molten pool; (V in slag
2O
5During)＜0.35%, it is 50～200NL/min that the single-point flow is blown in reduction Ar gas blowout, claws poor vanadium slag; Preparation enters next stage.
Through two or three phases, when stirring reduction period and finishing, in electric arc furnace, the composition of vanadium ferro-silicon liquid is: [V] 40～50%, [Si] 8～10%.
6) after the stirring reduction period finished, the refining nitriding phase began.The compound that adds Vanadium Pentoxide in FLAKES fuse piece and lime; Blowing gas switches to nitrogen by argon gas, improve simultaneously the winding-up flow, the single-point flow is 200～500NL/min, utilize gas stirring power mixing molten bath, reduce in stove the silicon in the vanadium ferro-silicon and improve content of vanadium, nitrogen penetrates into the molten bath, form the vanadium nitrogen compound, in final electric arc furnace, the composition of nitrogenous vanadium iron liquid is: [V] 45～60%, [Si]＜2%, [N]〉2%;
7) composition qualified after, reduce the nitrogen-blow flow, the single-point flow is 50～200NL/min, and slag iron is fully separated, and claws the rich vanadium slag of refining stand-by;
8) nitrogenous ferro-vanadium is cast into ingot mould, and naturally cooling under nitrogen protection obtains the finished product.
This vanadium iron electric arc furnace uses the present invention to produce nitrogenous ferro-vanadium, and its composition is [V] 45～60%, [Si]＜2%, [N] 2～8% compares with the vanadium iron technique that original production is common, and the v element recovery rate improves 1%, smelting cycle shortens 50 minutes, and melting electric consumption reduces by 15%, smelts comprehensive cost and reduces by 3%.
Claims (2)
1. method of using the vanadium iron electric arc furnace to produce nitrogenous ferro-vanadium, it is characterized in that: at the bottom of the vanadium iron arc furnace or the furnace wall single or branched nitrogen/argon blowing device are installed, by free nitrogen-blow and argon gas in vanadium iron electric arc furnace molten bath, carry out liquid nitriding in vanadium iron liquid, finally obtain nitrogenous ferro-vanadium; Nitrogen/argon blowing device adopts the mode of metal ring slit-tube or refractory materials slit gas permeable brick to design, itself and external control valve assembly are closed, can realize free nitrogen-blow and argon gas in the vanadium iron electric arc furnace molten bath, the Gas injection flow control scope of single nitrogen/argon blowing device is 20 ~ 500NL/min.
2. a kind of method of using the vanadium iron electric arc furnace to produce nitrogenous ferro-vanadium according to claim 1, it is characterized in that, the nitrogenous ferro-vanadium process of smelting in electric arc furnace is carried out in two steps, the first step is to stir reduction period, with ferrosilicon and metallic aluminium reduction Vanadium Pentoxide in FLAKES, obtain the vanadium ferro-silicon of high silicon under the condition that Argon stirs; Second step is the refining nitrogen pick-up phase, with excessive Vanadium Pentoxide in FLAKES refining vanadium ferro-silicon, reduces silicone content, continues simultaneously nitrogen-blow nitrogen pick-up, finally obtains nitrogenous ferro-vanadium; Concrete smelting process is as follows:
1) after a upper stove taps a blast furnace, fettling;
2) add the needed whole steel scraps of production;
3) open nitrogen/argon blowing device, blowing gas is argon gas, and single-point winding-up flow is 20 ~ 200NL/min:
4) begin energising, and the rich vanadium slag of the refining of a upper stove is returned in stove;
5) stir reduction period and begin, be divided into two or three phases in the stirring reduction period, be divided into two or three parts with smelting required Vanadium Pentoxide in FLAKES fuse piece, ferrosilicon, lime and metallic aluminium, distribute by the stage, in per stage, operating process is identical; In the stirring reduction period, nitrogen/argon blowing device continues winding-up Ar gas, agitation molten pool, and guarantee that gas circuit is unobstructed;
Stirring the interior every stages operating process of reduction period is: improve Ar gas blowout wind drift amount, the single-point flow reaches 100 ~ 500NL/min; Add all Vanadium Pentoxide in FLAKES fuse piece, lime and 60-80% of this stage ferrosilicon, bring into use transformer lowest gear power supply; Along with the fusing of raw material, progressively improve the power supply gear; After the molten bath forms, use high tap position power supply, furnace charge is melted rapidly; Until raw material molten clear after, the power supply gear reduces by one or second gear, adds remaining ferrosilicon, then adds the V in the aluminium reducing slag
2O
5, keep Ar gas blowout wind drift amount, fully agitation molten pool; (V in slag
2O
5During)＜0.35%, it is 20 ~ 200NL/min that the single-point flow is blown in reduction Ar gas blowout, claws poor vanadium slag; Preparation enters next stage;
Through two or three phases, when stirring the reduction period end, in electric arc furnace, the composition of vanadium ferro-silicon liquid is: [V] 40 ~ 50%, and [Si] 8 ~ 10%, surplus is Fe;
After stirring the reduction period end, the refining nitriding phase begins; The compound that adds Vanadium Pentoxide in FLAKES fuse piece and lime; Blowing gas switches to nitrogen by argon gas, improve simultaneously the winding-up flow, single Zhi Liuliang is set as 100 ~ 500NL/min, utilize gas stirring power mixing molten bath, reduce in stove the silicon in the vanadium ferro-silicon and improve content of vanadium, nitrogen penetrates into the molten bath, form the vanadium nitrogen compound, in final electric arc furnace, the composition of nitrogenous vanadium iron liquid is: [V] 45 ~ 60%, [Si]＜2%, [N]〉2%;
6) composition qualified after, reduce the nitrogen-blow flow, single Zhi Liuliang is set as 20 ~ 100NL/min, and slag iron is fully separated, and claws the rich vanadium slag of refining stand-by;
7) nitrogenous ferro-vanadium is cast into ingot mould, and naturally cooling under nitrogen protection obtains the finished product.
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| CN106834775A (en) * | 2016-11-24 | 2017-06-13 | 北京科技大学 | A kind of carbon thermal reduction and the method for Nitration synthesis ferrovanadium nitride |
| CN107354367A (en) * | 2017-07-25 | 2017-11-17 | 攀钢集团研究院有限公司 | Shorten the smelting process of the vanadium iron duration of heat |
| CN107354368A (en) * | 2017-07-25 | 2017-11-17 | 攀钢集团研究院有限公司 | The smelting process of efficient smelting ferrovanadium |
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| CN105838971A (en) * | 2016-06-13 | 2016-08-10 | 攀钢集团攀枝花钢铁研究院有限公司 | Preparation method for FeV50 alloy |
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| CN107354367A (en) * | 2017-07-25 | 2017-11-17 | 攀钢集团研究院有限公司 | Shorten the smelting process of the vanadium iron duration of heat |
| CN107354368A (en) * | 2017-07-25 | 2017-11-17 | 攀钢集团研究院有限公司 | The smelting process of efficient smelting ferrovanadium |
| CN107447160A (en) * | 2017-07-25 | 2017-12-08 | 攀钢集团研究院有限公司 | Reduce the smelting process of the residual vanadium of ferrovanadium slag |
| CN110044186A (en) * | 2019-04-25 | 2019-07-23 | 北京中联杰能科技有限公司 | Electric arc furnace smelting control method and control system |
| CN114277304A (en) * | 2021-11-23 | 2022-04-05 | 攀钢集团攀枝花钢铁研究院有限公司 | Method for smelting ferrovanadium alloy in straight barrel furnace |
| CN114107773A (en) * | 2021-12-02 | 2022-03-01 | 承德锦科科技股份有限公司 | 50 ferrovanadium-silicon and preparation method thereof |
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