CN103993118B - A kind of smelting process containing sefstromite - Google Patents
A kind of smelting process containing sefstromite Download PDFInfo
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- CN103993118B CN103993118B CN201410232951.1A CN201410232951A CN103993118B CN 103993118 B CN103993118 B CN 103993118B CN 201410232951 A CN201410232951 A CN 201410232951A CN 103993118 B CN103993118 B CN 103993118B
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Abstract
The invention provides a kind of smelting process containing sefstromite.Described method comprises: molten point of rotary hearth furnace reduction, electric furnace, obtains high-sulfur vanadium-bearing hot metal; Go out in hot metal ladle, and in the process of tapping a blast furnace, add the first sweetening agent, remove to make vanadium-bearing hot metal account for target desulfurization amount 5% ~ 15% sulphur; Heating vanadium-bearing hot metal to temperature is not less than 1580 DEG C, and adds the second sweetening agent before heating, remove to make vanadium-bearing hot metal account for target desulfurization amount 17% ~ 25% sulphur; Carry out desulfurization to vanadium-bearing hot metal winding-up the 3rd sweetening agent, to make vanadium-bearing hot metal remove remaining sulphur in target desulfurization amount, after having jetted, skim; Oxygen blast vanadium extraction is carried out to vanadium-bearing hot metal, and obtains vanadium slag and low-sulfur molten iron.Operation is simple in the present invention, labour intensity reduces, energy consumption is low, cost is low, and can ensure that producing continous-stable carries out, and can obtain sulphur content and to meet the demands qualified half product made from steel of (such as, sulphur content is lower than 0.1%).
Description
Technical field
The present invention relates to the non-technical field of blast furnace process containing vanadium titanium elements iron ore, specifically, relate to a kind of method of smelting containing sefstromite (such as, v-ti magnetite concentrate).
Background technology
At present, rotary hearth furnace direct-reduction is a focus of field of metallurgy, and it is high with reduction temperature, reduction rate fast, and thus furnace charge and furnace bottom geo-stationary are subject to the favor of numerous producer to features such as furnace charge requirement of strength are low, in addition, rotary hearth furnace direct-reduction does not need sintering circuit, does not use coke, environmental friendliness, meet the mainstream thoughts of society cleaner production, therefore, many enterprises build rotary hearth furnace project in recent years, are used for processing metallurgical waste or special mineral.
Typical v-ti magnetite concentrate rotary hearth furnace-electric furnace reduction technique can be: be pressed into green-ball through high-pressure ball press after v-ti magnetite concentrate, coal dust (reductive agent) and binding agent mix by a certain percentage, and green pellets feeds rotary hearth furnace by oscillating feeder after drying and uniform spreading is located at furnace bottom on the surface; Pit coal mixing pelletizing completes the metallized pellet that direct-reduction obtains having certain degree of metalization in rotary hearth furnace, and metallized pellet hot charging enters a molten point dark electric reduction furnace and carries out slag sluicing system, obtains vanadium-bearing hot metal and Ti-containing slag.
Contriver finds through research: in roasting process, slough most of element sulphur different from acid pellet, typical v-ti magnetite concentrate rotary hearth furnace-electric furnace reduction technique is owing to adopting ball press technique, at balling stage without any sweetening power, the element sulphur in concentrate and coal dust all enters into rotary hearth furnace with pelletizing.Rotary hearth furnace bore temperature higher (1300 ~ 1400 DEG C), but reducing atmosphere is near charge level, do not possess the atmospheric condition of oxidation sweetening, therefore rotary hearth furnace operation does not also possess sweetening power.Therefore, the sulphur carried in raw material almost all enters in metallized pellet, carries out melting, distributes by a certain percentage into slag and molten iron in the process of slag sluicing system in electric furnace.Due to the more common ore deposit of sulphur content in Panxi Diqu vanadium titano-magnetite higher (as climb S content in concentrate be 0.6% ~ 0.7%), sulphur content in the vanadium-bearing hot metal of molten point electrosmelting is caused generally all to be greater than 0.5%, belong to high-sulphur molten iron, take merely one-level winding-up in molten iron, spray into sweetening agent effect undesirable, and the winding-up time is long, hot metal temperature drop is large, larger on subsequent disposal impact.
In addition, v element also containing 0.3% ~ 0.6% in molten iron, need to carry out oxygen blast vanadium extraction operation to realize effective extraction and the utilization of resource, the temperature, iron water amount etc. of vanadium extracting process to molten iron all have comparatively strict requirement, need to make overall plans and coordinate process desulfurization, vanadium extraction two processes to make production direct motion, reduce cost consumption.
Summary of the invention
The object of the invention is to solve at least one item in prior art above shortcomings.
Such as, the object of the present invention is to provide a kind of technique of v-ti magnetite concentrate being carried out to non-blast furnace reduction, desulfurization, vanadium extraction.
The invention provides a kind of smelting process containing sefstromite.Described smelting process comprises the following steps that order is carried out: rotary hearth furnace reduction, containing sefstromite, obtains metallized pellet; The molten point metallized pellet reduction of electric furnace, obtain high-sulfur vanadium-bearing hot metal and titanium slag, wherein, described high-sulfur vanadium-bearing hot metal contains the sulphur being not less than 0.5% by weight percentage and the v element being not less than 0.3%, and the temperature of described high-sulfur vanadium-bearing hot metal is more than 1530 DEG C; Vanadium-bearing hot metal is gone out in hot metal ladle, and in hot metal ladle, add the first sweetening agent in the process of tapping a blast furnace, remove to make vanadium-bearing hot metal account for by weight percentage target desulfurization amount 5% ~ 15% sulphur; Make its temperature be not less than 1580 DEG C with temperature-raising device heating vanadium-bearing hot metal, and add the second sweetening agent in described heating vanadium-bearing hot metal forward direction molten iron, remove to make vanadium-bearing hot metal account for by weight percentage target desulfurization amount 17% ~ 25% sulphur; Adopt desulfurization rifle to carry out desulfurization to vanadium-bearing hot metal winding-up the 3rd sweetening agent, to make vanadium-bearing hot metal remove remaining sulphur in target desulfurization amount, after having jetted, skim; Oxygen blast vanadium extraction is carried out to vanadium-bearing hot metal, and obtains vanadium slag and low-sulfur molten iron.
In one exemplary embodiment of the present invention, described high-sulfur vanadium-bearing hot metal also can contain the carbon of 1.0% ~ 2.0% and the element silicon of 0.3% ~ 0.8%.
In one exemplary embodiment of the present invention, described smelting process also can comprise and uses temperature-raising device low-sulfur molten iron to be heated to 1560 DEG C ~ 1600 DEG C, and the sulphur content controlling low-sulfur molten iron is lower than 0.1%, then carries out ingot bar process to low-sulfur molten iron.
In one exemplary embodiment of the present invention, the described step gone out by vanadium-bearing hot metal to hot metal ladle makes vanadium-bearing hot metal remove to account for the sulphur of 9% ~ 12% of target desulfurization amount.
In one exemplary embodiment of the present invention, the step of described temperature-raising device heating vanadium-bearing hot metal makes vanadium-bearing hot metal remove to account for the sulphur of 19% ~ 22% of target desulfurization amount.
In one exemplary embodiment of the present invention, the described step gone out by vanadium-bearing hot metal to hot metal ladle leaves the headroom of 0.6 ~ 0.8m above hot metal ladle molten bath.
In one exemplary embodiment of the present invention, described in add the first sweetening agent step going out when iron reaches 1/4 ~ 1/2 of ladleful to carry out.
In one exemplary embodiment of the present invention, described to vanadium-bearing hot metal winding-up the 3rd sweetening agent carry out desulfurization step control the winding-up time be 10 ~ 30min.
In one exemplary embodiment of the present invention, the step of described temperature-raising device heating vanadium-bearing hot metal, makes the temperature 1600 DEG C ~ 1620 DEG C of vanadium-bearing hot metal.
In one exemplary embodiment of the present invention, described first sweetening agent is calcium base desulfurizer powder or quickened lime, the add-on of the first sweetening agent is 0.5% ~ 1.5% of vanadium-bearing hot metal quality, described second sweetening agent is calcium base desulfurizer powder or quickened lime, the add-on of the second sweetening agent is 0.5% ~ 1.5% of vanadium-bearing hot metal quality, described 3rd sweetening agent is calcium-based desulfurizing agent or calcium magnesium composite desulfurizing agent, and the add-on of the 3rd sweetening agent is 2% ~ 6% of vanadium-bearing hot metal quality.
Embodiment
Hereinafter, the smelting process containing sefstromite of the present invention will be described in detail in conjunction with exemplary embodiment.
Contriver finds through research: for the high-sulfur vanadium-bearing hot metal that typical v-ti magnetite concentrate rotary hearth furnace-electric furnace reduction technique obtains, because in this high-sulfur vanadium-bearing hot metal, carbon content is lower (such as, be 1.0% ~ 2.0% by weight percentage, especially, be 1.3% ~ 1.8%) and silicone content is higher (such as, be 0.3% ~ 0.8% by weight percentage, especially, be 0.45% ~ 0.70%), therefore, cause the liquidus temperature of this high-sulfur vanadium-bearing hot metal high (such as, at about 1400 DEG C).Therefore, if carry out desulfurization directly to blowing desulfurization agent in this high-sulfur vanadium-bearing hot metal, do experiment according to contriver and calculate, wanting the desulfurization degree reaching more than 70wt%, needing winding-up 40 ~ 90kg/t
molten ironsweetening agent, winding-up amount is very large, and the winding-up time is also longer, such as, is generally 30 ~ 60min.And if jetted always, then hot metal temperature drop is very fast, thus is unfavorable for the carrying out of subsequent technique; If the situation that the temperature drop caused in order to avoid jetting always is too fast, and heat molten iron after getting winding-up 20 ~ 30min, then continue the mode of jetting, although then can feed enough sweetening agents, operating process is loaded down with trivial details, length consuming time, and energy consumption is high.Therefore, for the characteristic of the high-sulfur vanadium-bearing hot metal that typical v-ti magnetite concentrate rotary hearth furnace-electric furnace reduction technique obtains, in order to shorten the treatment time of this high-sulfur vanadium-bearing hot metal, reduce production cost, contriver progressively explores the method for use Multistage desulfuration of the present invention, namely, in the process of tapping a blast furnace, partial desulfurization agent is added in heating temperature raising process, to carry out twice auxiliary desulfurization and to build better desulfurization environment, then, carry out blowing desulfurization, thus obviously reduce the working load of molten iron injection system, molten iron injection system can once be jetted put in place, avoid secondary even repeatedly to jet and cause the too much consumption of the energy, sweetening effectiveness is good, and can with follow-up vanadium extraction operation, steel making working procedure effectively combines even.
In one exemplary embodiment of the present invention, the smelting process containing sefstromite is made up of the following steps of sequentially carrying out: rotary hearth furnace reduction, containing sefstromite, obtains metallized pellet; The molten point metallized pellet reduction of electric furnace, obtain high-sulfur vanadium-bearing hot metal and titanium slag, wherein, described high-sulfur vanadium-bearing hot metal contains the sulphur being not less than 0.5% by weight percentage and the v element being not less than 0.3%, and the temperature of described high-sulfur vanadium-bearing hot metal is more than 1530 DEG C; Vanadium-bearing hot metal is gone out in hot metal ladle, and in hot metal ladle, add the first sweetening agent in the process of tapping a blast furnace, remove the sulphur of 5% ~ 15% (being preferably 9% ~ 12%) accounting for target desulfurization amount by weight percentage to make vanadium-bearing hot metal; Its temperature is made to be not less than 1580 DEG C (preferably with temperature-raising device heating vanadium-bearing hot metal, its temperature is made to be 1600 DEG C ~ 1620 DEG C), and the second sweetening agent is added in described heating vanadium-bearing hot metal forward direction molten iron, the sulphur of 17% ~ 25% (being preferably 19% ~ 22%) accounting for target desulfurization amount is by weight percentage removed to make vanadium-bearing hot metal; Adopt desulfurization rifle to carry out desulfurization to vanadium-bearing hot metal winding-up the 3rd sweetening agent, remove remaining sulphur in target desulfurization amount, after having jetted to make vanadium-bearing hot metal, skim, the winding-up time can be determined according to molten steel sulfur content and temperature drop situation, and preferably, the winding-up time can be 10 ~ 30min; Oxygen blast vanadium extraction is carried out to vanadium-bearing hot metal, and obtains vanadium slag and low-sulfur molten iron.
Especially, high-sulfur vanadium-bearing hot metal can containing being not less than the sulphur of 0.6% ~ 1.3% and be not less than the v element of 0.4% ~ 0.6%, and the temperature of described high-sulfur vanadium-bearing hot metal is 1560 DEG C ~ 1610 DEG C.
In the present example embodiment, the first sweetening agent can be one or more in multiple sweetening agent, and the feed postition of sweetening agent also can control flexibly, preferably, can adopt low-cost calcium base desulfurizer powder, adopts artificial mode of delivering to add in hot metal ladle.When the first sweetening agent is calcium base desulfurizer powder, its add-on is 0.5% ~ 1.5% of vanadium-bearing hot metal quality.Second sweetening agent can be one or more in multiple sweetening agent, and the feed postition of sweetening agent also can control flexibly, preferably, can adopt low-cost calcium base desulfurizer powder, adopts artificial mode of delivering to add in hot metal ladle.When the second sweetening agent is calcium base desulfurizer powder, its add-on is 0.5% ~ 1.5% of vanadium-bearing hot metal quality.Desulfurization rifle can adopt the spray gun of various ways, preferably, can adopt the desulphurization spray gun of tubular, inner lining refractory.3rd sweetening agent can be one or more in multiple sweetening agent, preferably, can adopt calcium-based desulfurizing agent or calcium magnesium composite desulfurizing agent.When the 3rd sweetening agent is calcium-based desulfurizing agent or calcium magnesium composite desulfurizing agent, its add-on is 2% ~ 6% of vanadium-bearing hot metal quality.
In the present example embodiment, the step gone out by vanadium-bearing hot metal to hot metal ladle leaves the headroom of certain altitude above hot metal ladle molten bath, to avoid molten iron splash in desulfurization, vanadium extracting process and injury device.Overhead clearance is according to hot metal ladle volume and desulfurization, process for extracting vanadium parameter and determining, and preferably, overhead clearance can be 0.6 ~ 0.8m.Preferably, the step adding the first sweetening agent, going out when iron reaches 1/4 ~ 1/2 of ladleful to carry out, can obtain better hot metal ladle sweetening effectiveness like this.
In the present example embodiment, temperature-raising device can be LF stove, and the benefit adding the second sweetening agent in heating vanadium-bearing hot metal forward direction molten iron comprises: be conducive to slag making submerged arc and molten iron is heated up smoothly; Improve sweetening effectiveness.
In another exemplary embodiment of the present invention, containing the smelting process of sefstromite when comprising above-mentioned steps, also can comprise and use temperature-raising device (such as, LF stove) low-sulfur molten iron is heated to 1560 DEG C ~ 1600 DEG C, and the sulphur content controlling low-sulfur molten iron is lower than 0.1%, then carries out ingot bar process to low-sulfur molten iron.But, the present invention is not limited thereto.For low-sulfur molten iron of the present invention, also directly can make steel and external refining process to it.
Below in conjunction with concrete example, the specific embodiment of the present invention is described in detail.Should be understood that, concrete example as described herein, only for instruction and explanation of the present invention, is not limited to the present invention.
The equipment adopted in example below can be: siege width is the rotary hearth furnace of 5m, and metallized pellet output is 12t/h; The molten point dark electric reduction furnace of 12500kVA, smelting cycle 4 ~ 5h, single stove hot metal output 18 ~ 22t; LF temperature raising stove equipment is a set of; Desulfuration injection system is a set of; Hot metal ladle oxygen blast vanadium extraction facility is a set of; Capacity is the hot metal ladle of 30t a set of (6); Other off-set facility are a set of.
Example 1
The metallized pellet hot charging that rotary hearth furnace is produced enters molten point dark electric reduction furnace, electric furnace adopts batch charging system, metallized pellet melts under electric energy effect, slag sluicing system, simultaneously, by controlling bath temperature, the reduction factor such as dosage and reaction times promotes that the vanadium in slag reduces in molten iron, and smelting endpoint forms vanadium-bearing hot metal and the (TiO of [V]=0.45%
2)=46% Ti-containing slag.In the process, element sulphur also distributes in slag, iron, [S]=0.60% in vanadium-bearing hot metal, (S)=0.49% in slag.Further, [C]=1.8%, [Si]=0.6% in vanadium-bearing hot metal.
Molten point dark electric reduction furnace slag, iron separate, molten iron is by hot metal ladle splendid attire, when going out iron and reaching about 1/3 of ladleful, quickened lime sweetening agent 200kg is added in ladle, tap a blast furnace and notice that retaining ladle top has the headroom of 0.7m in case molten iron splash in anti-avulsion sulphur and vanadium extracting process latter stage, residue slag iron is stayed in stove by envelope stifled iron notch, or emptying flows in slag pan.After having tapped a blast furnace, in hot metal ladle, the quality of vanadium-bearing hot metal is 20t.
After a molten point dark electric reduction furnace list stove has tapped a blast furnace, to the sampling of molten iron thermometric, molten iron temperature about 1550 ± 5 DEG C in hot metal ladle, chemically examines molten steel sulfur content is 0.451%.First temperature raising operation is carried out to molten iron, adopt LF stove heating unit, quickened lime sweetening agent 200kg is added before heating in hot metal ladle, then starting the arc heating, quickened lime can play desulfidation at this, simultaneously can also slag making submerged arc, LF stove can be heated up smoothly, make molten iron be warming up to 1600 ± 5 DEG C, thermometric is simultaneously to molten iron sampling, and chemical examination sulphur content is wherein 0.375%.
Hot metal ladle is transported to desulfurization station, and adopt desulfurization rifle to jet in molten iron calcium magnesium composite desulfurizing agent, winding-up 30min, sprays into about 780kg sweetening agent, removes desulfurization slag after winding-up terminates at station of skimming, and carries out real-time analysis to molten iron sampling simultaneously, chemical examination molten steel sulfur content.
Hot metal ladle is transported to vanadium extraction station, oxygen blast vanadium extraction, stops oxygen blast after 18min, removes molten iron surface vanadium slag.
Molten iron temperature after vanadium extraction is 1550 DEG C, lifts temperature to about 1580 DEG C through LF stove, and iron sample result of laboratory test is [S] < 0.1%, then direct molten iron is carried out ingot bar process.
The target desulfurization amount of the vanadium-bearing hot metal of this example is 100kg.As calculated, the desulfurization amount in tapping process is 10kg, and the desulfurization amount accounted in 10%, LF stove heating temperature raising process of target desulfurization amount is 15kg, accounts for 12% of target desulfurization amount.
The metallized pellet hot charging that example 2 rotary hearth furnace is produced enters molten point dark electric reduction furnace, electric furnace adopts batch charging system, metallized pellet melts under electric energy effect, slag sluicing system, simultaneously, by controlling bath temperature, the reduction factor such as dosage and reaction times promotes that the vanadium in slag reduces in molten iron, and smelting endpoint forms vanadium-bearing hot metal and the (TiO of [V]=0.4%
2)=46% Ti-containing slag.In the process, element sulphur also distributes in slag, iron, [S]=65% in vanadium-bearing hot metal, (S)=43% in slag.Further, [C]=1.38%, [Si]=0.55% in vanadium-bearing hot metal.
Molten point dark electric reduction furnace slag, iron separate, molten iron is by hot metal ladle splendid attire, when going out iron and reaching about 1/3 of ladleful, the composite desulfurizing agent such as lime, calcium carbide 150kg is added in ladle, tap a blast furnace and notice that retaining ladle top has the headroom of 0.6m in case molten iron splash in anti-avulsion sulphur and vanadium extracting process latter stage, residue slag iron is stayed in stove by envelope stifled iron notch, or emptying flows in slag pan.After having tapped a blast furnace, in hot metal ladle, the quality of vanadium-bearing hot metal is 18t.
After a molten point dark electric reduction furnace list stove has tapped a blast furnace, in the sampling of temperature raising station thermometric, molten iron temperature about 1540 ± 5 DEG C in hot metal ladle, Sulfur Content in Hot Iron content is 0.483%.First temperature raising operation is carried out to molten iron, adopt LF stove heating unit, the composite desulfurizing agent such as lime, calcium carbide 150kg is added before heating in hot metal ladle, then starting the arc heating, the composite desulfurizing agent such as lime, calcium carbide can play desulfidation at this, simultaneously can also slag making submerged arc, LF stove can be heated up smoothly, make molten iron be warming up to 1610 ± 5 DEG C, thermometric goes to drill to molten iron simultaneously, and measuring molten steel sulfur content is 0.373%.
Hot metal ladle is transported to desulfurization station, adopts desulfurization rifle to jet in molten iron calcium magnesium composite desulfurizing agent), winding-up 20min, spray into about 750kg sweetening agent, remove desulfurization slag at station of skimming after winding-up terminates, real-time analysis is carried out to molten iron sampling simultaneously, chemical examination molten steel sulfur content.
Hot metal ladle is transported to vanadium extraction station, oxygen blast vanadium extraction, stops oxygen blast after 20min, removes molten iron surface vanadium slag.
Molten iron temperature after vanadium extraction is 1520 DEG C, lifts temperature to about 1585 DEG C through LF stove, and iron sample result of laboratory test is [S] < 0.1%, then direct molten iron is carried out ingot bar process.
The target desulfurization amount of the vanadium-bearing hot metal of this example is 99kg.As calculated, the desulfurization amount in tapping process is 11.9kg, and the desulfurization amount accounted in 12%, LF stove heating temperature raising process of target desulfurization amount is 19.8kg, accounts for 20% of target desulfurization amount.
In sum, the present invention can provide a kind of and be suitable for containing the non-blast-furnace smelting of sefstromite, desulfurization, process for extracting vanadium, operation is simple for it, labour intensity reduces, energy consumption is low, cost is low, and can ensure that producing continous-stable carries out, and sulphur content can be obtained to meet the demands qualified half product made from steel of (such as, sulphur content is lower than 0.1%) or cast prod.
Although describe the present invention in conjunction with exemplary embodiment above, those of ordinary skill in the art should be clear, when not departing from the spirit and scope of claim, can carry out various amendment to above-described embodiment.
Claims (10)
1. containing a smelting process for sefstromite, it is characterized in that, described smelting process comprises the following steps that order is carried out:
Rotary hearth furnace reduction, containing sefstromite, obtains metallized pellet;
The molten point metallized pellet reduction of electric furnace, obtain high-sulfur vanadium-bearing hot metal and titanium slag, wherein, described high-sulfur vanadium-bearing hot metal contains the sulphur being not less than 0.5% by weight percentage and the v element being not less than 0.3%, and the temperature of described high-sulfur vanadium-bearing hot metal is more than 1530 DEG C;
Vanadium-bearing hot metal is gone out in hot metal ladle, and in hot metal ladle, add the first sweetening agent in the process of tapping a blast furnace, remove to make vanadium-bearing hot metal account for by weight percentage target desulfurization amount 5% ~ 15% sulphur;
Make its temperature be not less than 1580 DEG C with temperature-raising device heating vanadium-bearing hot metal, and add the second sweetening agent in described heating vanadium-bearing hot metal forward direction molten iron, remove to make vanadium-bearing hot metal account for by weight percentage target desulfurization amount 17% ~ 25% sulphur;
Adopt desulfurization rifle to carry out desulfurization to vanadium-bearing hot metal winding-up the 3rd sweetening agent, to make vanadium-bearing hot metal remove remaining sulphur in target desulfurization amount, after having jetted, skim;
Oxygen blast vanadium extraction is carried out to vanadium-bearing hot metal, and obtains vanadium slag and low-sulfur molten iron.
2. the smelting process containing sefstromite according to claim 1, is characterized in that, described high-sulfur vanadium-bearing hot metal is also containing the carbon of 1.0% ~ 2.0% and the element silicon of 0.3% ~ 0.8%.
3. the smelting process containing sefstromite according to claim 1, it is characterized in that, described smelting process also comprises and uses temperature-raising device low-sulfur molten iron to be heated to 1560 DEG C ~ 1600 DEG C, and the sulphur content controlling low-sulfur molten iron is lower than 0.1%, then carries out ingot bar process to low-sulfur molten iron.
4. the smelting process containing sefstromite according to claim 1, is characterized in that, the described step gone out by vanadium-bearing hot metal to hot metal ladle makes vanadium-bearing hot metal remove to account for the sulphur of 9% ~ 12% of target desulfurization amount.
5. the smelting process containing sefstromite according to claim 1, is characterized in that, the step of described temperature-raising device heating vanadium-bearing hot metal makes vanadium-bearing hot metal remove to account for the sulphur of 19% ~ 22% of target desulfurization amount.
6. the smelting process containing sefstromite according to claim 1, is characterized in that, the described step gone out by vanadium-bearing hot metal to hot metal ladle leaves the headroom of 0.6 ~ 0.8m above hot metal ladle molten bath.
7. the smelting process containing sefstromite according to claim 1, is characterized in that, described in add the first sweetening agent step going out when iron reaches 1/4 ~ 1/2 of ladleful to carry out.
8. the smelting process containing sefstromite according to claim 1, is characterized in that, it is 10 ~ 30min that described step of carrying out desulfurization to vanadium-bearing hot metal winding-up the 3rd sweetening agent controls the winding-up time.
9. the smelting process containing sefstromite according to claim 1, is characterized in that, the step of described temperature-raising device heating vanadium-bearing hot metal, makes the temperature 1600 DEG C ~ 1620 DEG C of vanadium-bearing hot metal.
10. the smelting process containing sefstromite according to claim 1, it is characterized in that, described first sweetening agent is calcium base desulfurizer powder or quickened lime, the add-on of the first sweetening agent is 0.5% ~ 1.5% of vanadium-bearing hot metal quality, described second sweetening agent is calcium base desulfurizer powder or quickened lime, the add-on of the second sweetening agent is 0.5% ~ 1.5% of vanadium-bearing hot metal quality, described 3rd sweetening agent is calcium-based desulfurizing agent or calcium magnesium composite desulfurizing agent, and the add-on of the 3rd sweetening agent is 2% ~ 6% of vanadium-bearing hot metal quality.
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| CN107034332A (en) * | 2017-05-18 | 2017-08-11 | 北京首钢股份有限公司 | A kind of molten iron pre-desulfurization method |
| CN111041156A (en) * | 2019-12-26 | 2020-04-21 | 河钢股份有限公司承德分公司 | Single-station molten iron treatment process |
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