CN111996328A - Molten iron desulphurization method for smelting reduction furnace - Google Patents
Molten iron desulphurization method for smelting reduction furnace Download PDFInfo
- Publication number
- CN111996328A CN111996328A CN202011080060.0A CN202011080060A CN111996328A CN 111996328 A CN111996328 A CN 111996328A CN 202011080060 A CN202011080060 A CN 202011080060A CN 111996328 A CN111996328 A CN 111996328A
- Authority
- CN
- China
- Prior art keywords
- molten iron
- reduction furnace
- smelting reduction
- iron
- desulfurization
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C1/00—Refining of pig-iron; Cast iron
- C21C1/02—Dephosphorising or desulfurising
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C1/00—Refining of pig-iron; Cast iron
- C21C1/02—Dephosphorising or desulfurising
- C21C1/025—Agents used for dephosphorising or desulfurising
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
- Treatment Of Steel In Its Molten State (AREA)
Abstract
The invention relates to the technical field of refining molten metal, in particular to a molten iron desulphurization method for a smelting reduction furnace, which comprises the following steps: adding a first desulfurizer into an iron water ditch at the rear part of the heating device for pre-desulfurization; the molten iron of the pre-desulfurized smelting reduction furnace enters an iron ladle provided with a second desulfurizer to carry out coarse desulfurization; and (4) carrying out core-spun yarn bottom blowing feeding desulphurization on the molten iron in the smelting reduction furnace after the coarse desulphurization. The desulfurization method can perform step-by-step desulfurization on high-sulfur and low-temperature molten iron, not only can effectively and reliably perform desulfurization, but also has the advantages of low investment, basically no early investment, lower production and operation cost and low maintenance cost.
Description
Technical Field
The invention relates to the technical field of refining molten metal, in particular to a molten iron desulphurization method for a smelting reduction furnace.
Background
The wire feeding technology is a general term for the core-spun wire production technology and the core-spun wire application technology. The realization process of the technology is as follows: a core-spun yarn with any length is wrapped by various additives which are to be added with molten steel or molten iron and crushed into certain granularity by adopting a thin steel strip on a core-spun machine, and then the core-spun yarn passes through a slag layer on the surface of the molten steel or the molten iron at a certain speed by means of a yarn feeding machine to reach the bottom of a steel ladle or an iron ladle. With the continuous melting of the sheath of the cored wire, the additive wrapped inside enters into the molten steel or molten iron, and the purpose of external refining is realized through the interaction of the additive and the molten steel or molten iron around the additive.
The molten steel is refined by utilizing the cored wire technology, which is a common metallurgical process, has the advantages of good stability, less heat loss, precise microalloying, small environmental pollution, suitability for automation and the like, and is used in the molten steel refining process.
However, the research and the industrial application of the ladle core wire desulfurization process are very few, and particularly, no relevant research and report is available for the desulfurization process of high-sulfur and low-temperature molten iron produced by a smelting reduction furnace. Because the sulfur content in the less-slag molten iron obtained by pressure tapping in the smelting reduction furnace is generally more than 0.100 percent, the highest sulfur content is about 0.150 percent, the temperature of the molten iron is more than 200 ℃ lower than that of the molten steel, and the intermittent tapping mode also causes difficulty to the desulfurization process. The molten iron desulphurization generally adopts a mode of blowing Mg + CaO composite desulphurization, but the method also has the problems of large floor area, high early investment cost, incapability of realizing automatic precise desulphurization and the like. The passivated magnesium core-spun yarn feeding and desulfurizing process has the problems of high core-spun yarn desulfurizing cost, splashing and low desulfurizing efficiency, and needs to be improved and optimized and subjected to various methods for synergistic treatment.
Therefore, how to efficiently desulfurize high-sulfur and low-temperature molten iron produced by a smelting reduction furnace to obtain high-purity foundry pig iron meeting the requirements is a problem to be solved at present.
Disclosure of Invention
The invention aims to provide a molten iron desulphurization method for a smelting reduction furnace, which can efficiently carry out desulphurization on molten iron with high sulphur and low temperature to obtain high-purity cast pig iron and has low treatment cost.
In order to solve the technical problems and achieve the corresponding technical effects, the invention adopts the following basic concept:
a molten iron desulfurization method for a smelting reduction furnace comprises the following steps:
adding a first desulfurizer into an iron water ditch at the rear part of the heating device for pre-desulfurization;
the molten iron of the pre-desulfurized smelting reduction furnace enters an iron ladle provided with a second desulfurizer to carry out coarse desulfurization;
and feeding core-spun yarns to the molten iron in the smelting reduction furnace after the coarse desulfurization for desulfurization.
In one embodiment, the molten iron in the smelting reduction furnace is tapped by a pressure tapping method.
As an embodiment, the process parameters of pressure tapping are as follows: intermittently tapping at 1350 ℃ and 1450 ℃ for 0.01-40 min; the molten iron in the smelting reduction furnace comprises the following components: 3.8 to 4.5 weight percent of C, less than 0.01 weight percent of Si, less than 0.01 weight percent of Mn, 0.07 to 0.15 weight percent of S and less than 0.035 weight percent of P.
As an implementation mode, the temperature of molten iron entering the melting reduction furnace of the molten iron runner is measured in real time through an online temperature measuring system.
As an embodiment, the first desulfurizing agent is selected from Na2CO3、CaC2One or more of CaO and Mg, or Na2CO3、CaC2One or more of CaO and Mg as basic raw materials.
In one embodiment, the first desulfurizing agent is added to the molten iron runner during the tapping process, and is stirred by molten iron impact.
As an implementation mode, the first desulfurizer is added in a manual adding mode, an automatic blanking mode or a powder spraying mode.
In one embodiment, the molten iron and the molten iron in the smelting reduction furnace after the preliminary desulfurization have an S content of 0.05 to 0.12 wt%.
In one embodiment, the second desulfurizing agent is soda ash or passivated lime powder.
In one embodiment, the S content in the molten iron in the smelting reduction furnace after the rough desulfurization of the bottom of the iron ladle is 0.05 wt% or less.
As an embodiment, the core-spun yarn comprises a sheath and a core, wherein the sheath is a steel sheet or an aluminum sheet, and the core is selected from Mg, Al and CaC2、CaO、CaF2And one or more of graphite or rare earth, in powder or granular form.
In one embodiment, the core-spun yarn has a diameter of
The thickness of the outer skin is 0.1-2 mm.
As an embodiment, the cored wire is a magnesium-containing composite cored wire, and the core comprises the following components: 30-80 wt% of passivated magnesium particles, 20-40 wt% of lime powder and 10-30 wt% of limestone powder; the Mg content in the passivated magnesium particles is more than or equal to 92 wt%, and the lime powder is passivated lime powder.
As an implementation mode, the overflow space at the upper part of the iron ladle is more than or equal to 500mm, the weight of molten iron in the iron ladle is 50-100t, and the depth of the molten iron is 2.0-2.3 m; the feeding depth of the core-spun yarn is 200-400mm away from the bottom of the iron ladle, and the yarn feeding speed is 1.0-1.5 m/s.
In one embodiment, after core-spun yarn feeding and desulfurizing, bottom-blowing argon gas is carried out on the iron ladle for stirring, so that the molten iron in the smelting reduction furnace in the iron ladle is uniform in composition, and the temperature of the molten iron is reduced to 20-25 ℃.
Further, as an implementation mode, the bottom of the iron ladle adopts the air brick, and the stirring time of bottom blowing argon is 3-10 min.
In one embodiment, after the wire-feeding desulfurization, dross formed on the surface of molten iron in the smelting reduction furnace is subjected to slagging-off or slag-off so as to prevent resulfurization of the molten iron, and the sulfur content in the molten iron is 0.02% or less.
Compared with the prior art, the invention has the following advantages:
1. the invention carries out step-by-step desulphurization on the high-sulfur and low-temperature molten iron in the smelting reduction furnace, not only can effectively and reliably carry out desulphurization on the molten iron, but also has less investment and basically no early investment, and the method has lower production running cost and less maintenance cost.
2. Compared with molten steel desulfurization in steelmaking, the invention further adopts improvement measures aiming at high-sulfur and low-temperature molten iron, carries out online electromagnetic induction heating on the low-temperature molten iron, ensures the subsequent molten iron temperature, ensures the molten iron quality, has better desulfurization effect, obtains high-purity cast molten iron, has less trace and harmful elements, and meets the requirement of sulfur content.
3. The invention adopts step-by-step desulfurization, firstly adopts a desulfurizing agent to reduce the sulfur content of the high-sulfur molten iron to a lower level, and then adopts a magnesium-containing cored wire to carry out accurate desulfurization, thereby reducing the cost, controlling the sulfur content in the molten iron and greatly reducing the dust content.
4. The invention further reduces the splashing of magnesium and increases the yield of magnesium by increasing the ladle cover.
5. After the molten iron desulphurization process is finished, the scum on the surface is removed in the modes of skimming or slag salvaging and the like, so that the occurrence of the resulfurization phenomenon of the molten iron is avoided.
It should be understood that the statements herein reciting aspects are not intended to limit the critical or essential features of the embodiments of the present disclosure, nor are they intended to limit the scope of the present disclosure. Other features of the present disclosure will become apparent from the following description.
Drawings
The above and other features, advantages and aspects of various embodiments of the present disclosure will become more apparent by referring to the following detailed description when taken in conjunction with the accompanying drawings. In the drawings, like or similar reference characters designate like or similar elements, and wherein:
fig. 1 is a flowchart of a molten iron desulfurization method for a smelting reduction furnace according to the present invention.
Fig. 2 is a flow of one mode of producing molten iron in the smelting reduction furnace.
Detailed Description
To make the objects, technical solutions and advantages of the embodiments of the present disclosure more clear, the technical solutions of the embodiments of the present disclosure will be described clearly and completely with reference to the drawings in the embodiments of the present disclosure, and it is obvious that the described embodiments are some, but not all embodiments of the present disclosure. All other embodiments, which can be derived by a person skilled in the art from the embodiments disclosed herein without making any creative effort, shall fall within the protection scope of the present disclosure.
The invention provides a molten iron desulphurization method for a smelting reduction furnace, which comprises the following steps:
the molten iron in the smelting reduction furnace is discharged in a pressure tapping mode, and the molten iron enters the molten iron channel in an upper iron overflow mode in the tapping chamber, so that slag is hardly brought into the molten iron, and the molten iron is essentially different from the molten iron in the blast furnace.
The specific parameters of the molten iron are as follows: the tapping temperature is 1350-. The molten iron comprises the following components: 3.8 to 4.5 weight percent of C, less than 0.01 weight percent of Si, less than 0.01 weight percent of Mn, 0.070 to 0.150 weight percent of S and less than 0.035 weight percent of P.
Pure molten iron enters the molten iron runner, the temperature of the molten iron is measured in real time through the molten iron on-line temperature measuring system, the molten iron on-line temperature measuring system and the monitoring system are provided with infrared temperature measuring probes, the infrared temperature measuring probes provided with the blowing air pipes and the cooling air pipes are fixedly arranged on a bracket 5-15 meters away from the molten iron and aim at the molten iron runner, continuous scanning measurement is carried out on the molten iron of each furnace, the molten iron heating rate of subsequent electromagnetic induction heating current can be dynamically adjusted, and the temperature of the outlet of the molten iron runner can be kept stable all the time; and the flow of the molten iron in the molten iron runner is monitored in real time so as to facilitate the adjustment of subsequent process parameters.
The method comprises the steps of preheating molten iron, adopting an electromagnetic induction heating mode, adopting a tundish electromagnetic induction heating mode, and also adopting an annular molten iron ditch online electromagnetic induction heating device to heat the molten iron. The iron output is 60-90 t, the heating temperature of the molten iron is more than 100 ℃, and the control precision is less than 10 ℃. The downward inclination angle of the molten iron runner along the flow direction of molten iron is 4-10 degrees, and the upper part of the molten iron runner is provided with a ladle cover. For example, the power consumption of the annular iron runner electromagnetic induction heating ton iron is less than 30 Kw.h/t, the electric efficiency reaches more than 85 percent, the total assembly power is lower than 12000Kw, and the working frequency is 50-100 Hz.
The molten iron desulphurization method provided by the invention utilizes multiple methods for synergistic treatment, and adopts a three-step method comprising pre-desulphurization of an iron runner, coarse desulphurization at the bottom of an iron ladle and precise desulphurization of molten iron feeding lines.
First step of desulfurization, namely adding a first desulfurizing agent into the rear part of the electromagnetic induction heating device of the molten iron ditch to perform first step of molten iron pre-desulfurization, wherein the first desulfurizing agent can be soda (Na)2CO3) Calcium carbide (CaC)2) Lime (CaO), metal magnesium or a composite desulfurizer based on the lime (CaO) and the metal magnesium. In the process, a desulfurizing agent is added into the molten iron ditch for desulfurization in the tapping process, and the molten iron is uniformly stirred by utilizing the impact and the mixing of the molten iron. The additive can be added manually or in an automatic blanking or powder spraying mode.
Secondly, desulfurizing, namely, the molten iron flows into an iron ladle through a swinging chute through an iron runner, a certain amount of desulfurizing agents such as sodium carbonate or calcium oxide are added at the bottom of the iron ladle in advance through a crane, and Ca (OH) is generated after moisture absorption because lime easily absorbs moisture2And the desulfurization effect is influenced, and passivated lime powder is adopted. The process steps adopt a tank flushing method to carry out coarse desulfurization on molten iron, and utilize molten iron to impact and stir a desulfurizing agent so as to achieve the aim of desulfurization. The molten iron tank flushing process can reduce the pretreatment time of molten iron and improve the production efficiency. And carrying out coarse desulfurization on the molten iron discharged from the tapping chamber, wherein the aim is to reduce the sulfur content in the molten iron from 0.10-0.15 wt% to below 0.05 wt%, and change the high-sulfur molten iron into the sulfur-containing molten iron.
And thirdly, desulfurizing, namely, feeding and desulfurizing by adopting cored wires, and carrying out external refining treatment on molten iron in the form of the cored wires. The core-spun yarn comprises a sheath and a core, wherein the sheath is selected from a steel sheet or an aluminum sheet, is a round steel belt and has the thickness of 0.1mm-2 mm. The diameter of the core-spun yarn is
The core material is selected from Mg, Al and CaC2、CaO、CaF2One or more of graphite and rare earth, which are powder or particles.
As a specific implementation mode, the cored wire can adopt a magnesium-containing composite cored wire, and the core material mixture ratio is as follows: 30-80 wt% of passivated magnesium particles, 20-40 wt% of lime powder and 10-30 wt% of limestone powder, wherein Mg in the passivated magnesium particles is more than or equal to 92 wt%, and the lime powder is passivated lime powder. After limestone powder is added into molten iron, the limestone powder can be decomposed into CO at high temperature2The stirring gas can be provided for the iron ladle, and the molten iron can be fully stirred in the iron ladle by the vaporization stirring of magnesium in the molten iron, so that the aim of uniform desulfurization of the molten iron is fulfilled, and the stirring effect is good, namely bottom blowing can be omitted or used in a small amount.
The composite cored wire is fed into molten iron through a wire feeding machine to carry out wire feeding desulfurization, and the sulfur content in the molten iron is accurately controlled by controlling process parameters such as wire feeding height, wire feeding verticality, wire feeding speed, wire feeding depth, wire feeding distance from the wire feeding to the bottom of an iron ladle and the like according to the temperature of the molten iron, wherein the sulfur content is generally controlled to be below 0.020 wt%. The overflow space at the upper part of the iron ladle is more than or equal to 500mm, and the depth of the iron water in the iron ladle is 2.0-2.3 m.
The utilization rate of magnesium is more than 70 percent, in order to ensure the yield of the magnesium cored wire, the cored wire is fed into a deeper position as far as possible, and the distance between the feeding wire and the bottom of the iron ladle is 200-400mm by combining a gas phase area and a liquid phase area of magnesium. In the field operation process, the feeding depth can be judged according to the flue gas amount during wire feeding and the desulfurization effect after wire feeding. The feeding speed is generally controlled to be 1.0-1.5m/s according to the size of the cored wire and the insertion depth.
And after the wire feeding is finished, bottom argon blowing and stirring are carried out to promote the uniformity of the components and the temperature of the molten iron.
The iron ladle adopts a bottom blowing mode, and can be subjected to bottom blowing powder spraying or bottom blowing stirring, the bottom blowing argon stirring is carried out for 3-10min, and the temperature of molten iron is reduced to 20-25 ℃.
After the desulfurization is finished, scum on the surface is removed in the modes of skimming or slag salvaging and the like, a small amount of generated molten iron desulfurization slag is removed, the resulfurization of the molten iron is avoided, and the S content in the molten iron is below 0.02 percent.
And the desulfurized molten iron is transported to a hydraulic tipping position of a hoisting machine system for tipping cast iron through an iron ladle car and a crane. And controlling the temperature of the molten iron to enable the surface quality and the internal quality of the final cast iron block to meet requirements, and screening and warehousing finished products.
Further, a cast iron production process using the molten iron desulfurization method according to the present invention will be described below by way of example.
A molten iron desulfurization method for a smelting reduction furnace comprises the following steps:
(1) tapping molten iron in the smelting reduction furnace in a pressure tapping mode, feeding the molten iron into an iron runner in an upper iron overflow mode in a tapping chamber, wherein the normal production pressure in the smelting reduction furnace is 65KPa, tapping is carried out when enough molten iron is produced in the furnace and tapping conditions are met, the pressure in the furnace is gradually increased, and the tapping pressure reaches 85 KPa.
The specific parameters of the molten iron are as follows: the tapping temperature is 1390 ℃, the tapping time is 35min, the tapping amount is 80t, and the tapping is interrupted. The molten iron comprises the following components: 4.0 wt% of C, 0.005 wt% of Si, 0.004 wt% of Mn, 0.11 wt% of S, 0.030 wt% of P and less than 5 wt% of molten iron slag.
The overflowing molten iron enters the molten iron runner, the online temperature measuring system and the monitoring system of the molten iron runner monitor the temperature and the flow of the molten iron in real time, the molten iron runner heats the molten iron by adopting an online electromagnetic induction heating device, the temperature of the molten iron is increased to 50 ℃, namely the temperature of the molten iron reaches 1440 ℃, and the upper part of the molten iron runner is provided with a ladle cover to reduce the temperature drop of the molten iron.
Adding a first desulfurizer into an iron water channel at the rear part of the electromagnetic induction heating device, stirring and uniformly mixing the first desulfurizer by utilizing the impact of flowing molten iron, and performing the first step of molten iron pre-desulfurization; the first desulfurizer is soda (Na)2CO3) The consumption of the desulfurizer is 10kg/t, and the sulfur content in the treated molten iron is 0.085 wt%.
(2) Molten iron flows into an iron ladle through a molten iron trough and a swinging chute, about 100kg of soda and lime (a second desulfurizing agent) is added to the bottom of the iron ladle in advance through a crane, the molten iron flows into the iron ladle, and the second desulfurizing agent is removed by impacting and stirring the molten iron to achieve the aim of desulfurization.
The second desulfurizer is added into the iron ladle in advance, so that the pretreatment time of molten iron can be shortened, and the production efficiency is improved. Will be provided with
And carrying out coarse desulphurization on the molten iron discharged from the tapping chamber, wherein the content of the molten iron S in the ladle is 0.045 wt%, and the molten iron is changed from high-sulfur molten iron to medium-sulfur molten iron.
(3) And in the third step, core-spun yarns are adopted for precise and deep yarn feeding desulfurization, the specification of the fed core-spun yarns is phi 13mm, and the thickness of the fed core-spun yarns is 0.4 mm. Adopt and contain magnesium covering wire, the core material concrete component in the covering wire is: 50 wt% of passivated magnesium particles, wherein the content of Mg in the passivated magnesium is more than or equal to 92 wt%, and 40 wt% of the passivated magnesium is lime powder. The balance is an additive, specifically, the additive specifically comprises 5 wt% of fluorite and 5 wt% of graphite powder;
the wire feeding process parameters are as follows: the feeding height of the magnesium-containing core-spun yarn is more than 500mm from the molten iron liquid level, the feeding depth is less than 400mm from the iron ladle bottom, the core-spun yarn guide pipe is vertically fed with the liquid level and aligned with the center of the iron ladle, the yarn feeding speed is 1.5m/s, the yarn feeding amount is 1200m, and the yarn feeding time is 12 min.
(4) And after the wire feeding is finished, bottom blowing argon stirring is carried out at the bottom of the iron ladle, and the bottom blowing stirring is carried out for 5min, so that the temperature of the iron liquid is reduced to 25 ℃.
And after the desulfurization is finished, carrying out slagging-off operation on the scum on the surface, and carrying out sampling detection on the temperature and components of the desulfurized molten iron, wherein the temperature of the molten iron is 1350 ℃, and the sulfur content in the molten iron is 0.020 wt%.
(5) And the desulfurized molten iron is transported to a hydraulic tipping position of a hoisting machine system for tipping cast iron through an iron ladle car and a crane.
And controlling the temperature of the molten iron to enable the surface quality and the internal quality of the final cast iron block to meet requirements, and screening and warehousing finished products.
The pressure tapping device adopted in the technical scheme can be a smelting reduction furnace pressure monitoring and controlling system and a smelting reduction furnace system of the utility model patent ZL 202020064537.5. The electromagnetic induction heating device can be a channel type molten iron tundish electromagnetic induction heating device of the utility model 202021614156.6. Or the online electromagnetic induction concurrent heating device of the iron runner of the utility model patent 202021790674.3. The adopted composite cored wire can also adopt the composite cored wire of the utility model patent ZL 201921818939.3. The adopted ladle bottom blowing device can be the ladle bottom blowing powder spraying desulphurization device of the utility model 202021377953.7.
In the description of the present application, the description of the terms "one embodiment," "some embodiments," etc. means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the application. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims (10)
1. A molten iron desulfurization method for a smelting reduction furnace is characterized by comprising the following steps:
adding a first desulfurizer at the rear part of the molten iron ditch heating device for pre-desulfurization;
the molten iron of the pre-desulfurized smelting reduction furnace enters an iron ladle provided with a second desulfurizer to be subjected to
Coarse desulfurization;
and (4) carrying out core-spun yarn bottom blowing feeding desulphurization on the molten iron in the smelting reduction furnace after the coarse desulphurization.
2. The method of desulfurizing molten iron in a smelting reduction furnace according to claim 1, wherein the molten iron in the smelting reduction furnace is tapped by a pressure tapping method;
preferably, the process parameters of the pressure tapping are as follows: intermittently tapping at 1350 ℃ and 1450 ℃ for 0.01-40 min; the molten iron in the smelting reduction furnace comprises the following components: c content of 3.8-4.5 wt%, Si content of less than 0.01 wt%, Mn content of less than 0.01 wt%, S content of 0.07-0.15 wt%, and P content of less than 0.035 wt%;
preferably, the temperature of the molten iron entering the smelting reduction furnace of the molten iron runner is measured in real time by an online temperature measuring system.
3. The method of desulfurizing molten iron in a smelting reduction furnace according to claim 1, wherein the first desulfurizing agent is selected from the group consisting of Na2CO3、CaC2One or more of CaO and Mg, or Na2CO3、CaC2One or more of CaO and Mg as basic raw materials.
4. The method for desulfurizing molten iron in a smelting reduction furnace according to claim 1, wherein the first desulfurizing agent is added to a molten iron runner during a tapping process, and is stirred by molten iron impact;
preferably, the first desulfurizer is added in a manual adding mode, an automatic blanking mode or a powder spraying mode;
preferably, the S content in the molten iron in the pre-desulfurized smelting reduction furnace is 0.05-0.12 wt%.
5. The molten iron desulphurization method according to claim 1, wherein the second desulfurizer is soda ash or passivated lime powder;
preferably, the S content in the molten iron in the smelting reduction furnace after the rough desulphurization at the bottom of the iron ladle is less than or equal to 0.05 wt%.
6. The molten iron desulfurization method for a smelting reduction furnace according to claim 1, wherein the cored wire includes a sheath and a core, the sheath is a steel sheet or an aluminum sheet, and the core is selected from the group consisting of Mg, Al, and CaC2、CaO、CaF2One or more of graphite or rare earth, which is in powder or particle shape;
preferably, the diameter of the cored wire is
The thickness of the outer skin is 0.1-2 mm.
7. The molten iron desulfurization method for a smelting reduction furnace according to claim 1, wherein the cored wire is a magnesium-containing composite cored wire, and the core part comprises the following components: 30-80 wt% of passivated magnesium particles, 20-40 wt% of lime powder and 10-30 wt% of limestone powder; the Mg content in the passivated magnesium particles is more than or equal to 92 wt%, and the lime powder is passivated lime powder.
8. The molten iron desulfurization method of a smelting reduction furnace according to claim 1, wherein an overflow space of an upper part of the iron ladle is not less than 500mm, and a depth of molten iron in the iron ladle is 2.0 to 2.3 m; the feeding depth of the core-spun yarn is 200-400mm away from the bottom of the iron ladle, and the yarn feeding speed is 1.0-1.5 m/s.
9. The method for desulfurizing molten iron in a smelting reduction furnace according to any one of claims 1 to 8, wherein after the cored wire is fed and desulfurized, the ladle is stirred by blowing argon from below, so that the molten iron in the smelting reduction furnace in the ladle has a uniform composition, and the temperature of the molten iron is reduced to 20 to 25 ℃;
preferably, the bottom of the iron ladle adopts a gas permeable brick, and the stirring time of bottom blowing argon is 3-10 min.
10. The method for desulfurizing molten iron according to any one of claims 1 to 9, wherein after the wire-feeding desulfurization, dross formed on the surface of molten iron in the smelting reduction furnace is subjected to slagging-off or slag-off so as to prevent resulfurization of molten iron, and the sulfur content in molten iron is 0.02 wt% or less.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011080060.0A CN111996328A (en) | 2020-10-10 | 2020-10-10 | Molten iron desulphurization method for smelting reduction furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011080060.0A CN111996328A (en) | 2020-10-10 | 2020-10-10 | Molten iron desulphurization method for smelting reduction furnace |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111996328A true CN111996328A (en) | 2020-11-27 |
Family
ID=73475784
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011080060.0A Pending CN111996328A (en) | 2020-10-10 | 2020-10-10 | Molten iron desulphurization method for smelting reduction furnace |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111996328A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116162846A (en) * | 2023-03-07 | 2023-05-26 | 江西理工大学 | Desulfurization method of high-sulfur copper-iron alloy produced by copper smelting slag and copper-iron alloy |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1243882A (en) * | 1998-08-03 | 2000-02-09 | 冶金工业部鞍山热能研究院 | Low-basicity less-slag iron smelting technology for blast furnace with external desulfurizing greatly of molten iron |
| CN102304601A (en) * | 2011-08-17 | 2012-01-04 | 山西太钢不锈钢股份有限公司 | Molten iron desulfurization method of taphole area of blast furnace |
-
2020
- 2020-10-10 CN CN202011080060.0A patent/CN111996328A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1243882A (en) * | 1998-08-03 | 2000-02-09 | 冶金工业部鞍山热能研究院 | Low-basicity less-slag iron smelting technology for blast furnace with external desulfurizing greatly of molten iron |
| CN102304601A (en) * | 2011-08-17 | 2012-01-04 | 山西太钢不锈钢股份有限公司 | Molten iron desulfurization method of taphole area of blast furnace |
Non-Patent Citations (1)
| Title |
|---|
| 白尚显等: "《燃料手册》", 31 October 1994, 冶金工业出版社 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116162846A (en) * | 2023-03-07 | 2023-05-26 | 江西理工大学 | Desulfurization method of high-sulfur copper-iron alloy produced by copper smelting slag and copper-iron alloy |
| CN116162846B (en) * | 2023-03-07 | 2023-09-05 | 江西理工大学 | Desulfurization method of high-sulfur copper-iron alloy produced by copper smelting slag and copper-iron alloy |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103014221B (en) | Method for producing high-aluminum steel plate blanks | |
| KR100695650B1 (en) | Refining agent and refining method | |
| Emi | Steelmaking technology for the last 100 years: toward highly efficient mass production systems for high quality steels | |
| CN109252008A (en) | A kind of production method of low carbon, low nitrogen ultralow-sulfur steel | |
| CN100510112C (en) | Short-flow super low carbon steel ultra-low sulphur smelting control method | |
| CN102268513B (en) | Method for improving castability of molten steel of medium and low carbon steel | |
| CN101225453A (en) | Electric furnace smelting method for low-carbon low-silicon steel | |
| CN105861775A (en) | Smelting process for ultra-low phosphorus steel with high nickel content | |
| CN104611502A (en) | Aluminum-containing and sulfur-containing series gear steel smelting process | |
| JP2012012648A (en) | Method for applying desulfurize-treatment to molten steel | |
| CN113088800A (en) | Method for recycling refining slag and molten steel casting residue of low-carbon aluminum killed steel LF furnace | |
| CN106011381A (en) | Molten steel out-of-furnace dephosphorization production technology | |
| CN114318154A (en) | High-cleanliness welding wire steel L-S3 and preparation method thereof | |
| CN115433809B (en) | Steel smelting production method for high-strength prestressed steel strand with excellent drawing performance | |
| CN105420445A (en) | Method for smelting coarse-grained steel | |
| CN108085448A (en) | A kind of production method by continuous casting pattern smelting low-sulfur steel in converter directly | |
| CN101935740A (en) | White slag refining agent for LF (Ladle Furnace) refining furnace and preparation method thereof | |
| CN114657323B (en) | Deep desulfurization method for LF (ladle furnace) | |
| CN111041367B (en) | Method for preventing carbon high-silicon low-manganese steel from flocculating in billet | |
| KR20130047559A (en) | Method of producing steel | |
| CN105463149A (en) | Process for deoxidation smelting of aluminum-bearing steel by means of silicon carbide | |
| CN112458236B (en) | Method for refining and deep desulfurization of molten steel, device for refining molten steel and application | |
| CN104263873A (en) | Process for producing aluminum-containing medium carbon steel through CaC2 deoxidization | |
| CN114686644A (en) | Method for quickly producing white slag in LF (ladle furnace) | |
| CN111996328A (en) | Molten iron desulphurization method for smelting reduction furnace |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20201127 |