CN113817894A - Online cleaning method for sticky slag of KR desulfurization stirrer of molten iron - Google Patents
Online cleaning method for sticky slag of KR desulfurization stirrer of molten iron Download PDFInfo
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- CN113817894A CN113817894A CN202010570096.0A CN202010570096A CN113817894A CN 113817894 A CN113817894 A CN 113817894A CN 202010570096 A CN202010570096 A CN 202010570096A CN 113817894 A CN113817894 A CN 113817894A
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- molten iron
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- 238000004140 cleaning Methods 0.000 title claims abstract description 90
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- BCAARMUWIRURQS-UHFFFAOYSA-N dicalcium;oxocalcium;silicate Chemical compound [Ca+2].[Ca+2].[Ca]=O.[O-][Si]([O-])([O-])[O-] BCAARMUWIRURQS-UHFFFAOYSA-N 0.000 description 1
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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
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/064—Dephosphorising; 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
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/064—Dephosphorising; Desulfurising
- C21C7/0645—Agents used for dephosphorising or desulfurising
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- 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)
Abstract
The invention discloses an online cleaning method for sticky slag of a KR desulfurization stirrer of molten iron, which comprises the following steps: 1. weighing the molten iron received by the molten iron tank, conveying the molten iron tank to a slag skimming station, carrying out temperature measurement sampling and slag pre-skimming on the molten iron, wherein the exposed surface of the molten iron is more than or equal to 2/3, and recording the temperature, the sulfur content and the weight of the molten iron before desulfurization; after the pre-slag is raked off, the amount of the pre-slag is 0.3-0.5 kg/tIronSpreading heat insulating agent; 2. the molten iron tank is moved to a desulfurization station to detect the liquid level height of the molten iron tank or calculate the liquid level height of the molten iron tank according to the weight of the molten iron and correct the liquid level height; 3. when the stirrer is used for cleaning sticky slag, the loading capacity of molten iron is not lower than 90% of the rated loading capacity of the molten iron tank, and the temperature of the molten iron is not lower than 1280 ℃; 4. the molten iron is inserted into a slag-sticking stirrer which needs to remove slag, the depth of the slag-sticking stirrer immersed in the molten iron with the vortex surface is not less than 50mm, and the height of the bottom surface of the stirrer from the bottom of the tank is not less than 500 mm; 5. controlling the stirring speed to be 1/3-1/2 of normal desulfurization speed, and stirring at 0.3-0.5 Kg/tIronAdding a desulfurizing agent to the molten iron liquid level; 6. keeping the stirring speed unchanged until the sticky slag of the stirrer is melted and cleaned.
Description
Technical Field
The invention relates to the field of pretreatment of molten iron, in particular to an on-line automatic cleaning method for sticky slag of a KR desulfurization stirrer of molten iron.
Background
Because a layer of liquid, molten or solid non-metallic slag inevitably floats on the surface of the liquid metal, even a plurality of non-metallic slag with different sizes suspend in the liquid metal, on the surface of an appliance or a container which is directly contacted with the liquid metal, especially the non-metallic slag floating on the surface of the liquid metal, the bonding slag of the non-metallic slag coated metal condensation particles is bonded on the contact surface of the appliance or the container due to the high-temperature reaction, the infiltration erosion, the heat dissipation, the cooling, the crystallization and the solidification, the condensation of the liquid metal and the like between the non-metallic slag and the contact surface of the appliance or the container; in addition, due to the splashing of high-temperature non-metallic slag and liquid metal caused by violent high-temperature metallurgical reaction, high-temperature splashes are adhered to the surface of an isolator of the metallurgical reaction device, and mixed sticky slag of the non-metallic slag and metal condensed particles is formed. Therefore, the slag adhesion is a phenomenon commonly existing in the ferrous metallurgy industry.
The thick sticky slag on the surface of the metallurgical appliance or the container not only increases the dead weight of the appliance or the container, brings inconvenience to the operation and the operation of the appliance or the container and the safe operation of crisis equipment, but also directly influences the equipment function of the metallurgical appliance or the container, brings difficulty to the smelting of high-quality products, even can not meet the production technical requirements and stop the use, and greatly improves the operation cost of the metallurgical appliance or the container, so that the online cleaning of the sticky slag is a maintenance operation generally adopted in the ferrous metallurgy industry.
And because the mixed sticky slag of non-metal slag and metal condensation particles is formed, the sticky slag has high bonding strength, not only has high bonding strength, but also has high bonding strength with a bonding surface, has good mechanical plasticity, is very difficult to clean conventionally, and is generally cleaned in a flame cutting and melting mode in the prior art. However, the flame cleaning will cause the high-temperature erosion damage of the material of the slag bonding surface, affect the maintenance and the service life of the metallurgical apparatus and the container, increase the production and maintenance cost, cause the environment pollution by the intense smoke and dust and harmful gas, seriously endanger the physical and mental health of the operators, and simultaneously require the operation space which is spacious, and facilitate the arrangement and the operation of the flame gun, so that the flame cleaning mode is difficult to adapt under the conditions of narrow operation environment, strict environment pollution requirement and high requirement on the shape and structure maintenance degree of the apparatus or the container, and the manual mechanical slag cleaning mode is generally adopted for cleaning, for example, the slag cleaning of the molten iron KR desulfurization stirrer adopts the manual pneumatic pick slag cleaning mode, so that the slag cleaning labor intensity is high, the cleaning time is long, the operation environment is poor, the cleaning frequency is high, and a large amount of non-operation time is occupied, difficulty is brought to molten iron desulphurization production organization; in order to guarantee the production rhythm, the phenomenon of incomplete slag removal or delayed slag removal often appears, so that the dynamic condition of the KR stirring desulfurization reaction of the molten iron and the economic index of the desulfurization technology are sharply reduced, the first hit rate of desulfurization is greatly reduced, even a large amount of secondary desulfurization is generated, and the production rhythm and the quality of the molten iron entering the furnace are more difficult to guarantee.
Therefore, for the KR stirring desulfurization process of molten iron, how to realize the quick and convenient cleaning of the sticky slag of the stirrer becomes one of the key technical problems which are urgently needed to be solved by the industry.
In order to solve the above problems, a great deal of work has been carried out by scholars at home and abroad, for example, chinese patent document No. 200610018622.2 discloses an anti-sticking coating, which is based on reducing the bonding strength of the sticking slag of a stirrer, and discloses an anti-sticking coating with low price, convenient preparation and simple use, and the anti-sticking coating comprises the following main raw materials in percentage by weight: 70-85% of aluminum silicon carbide carbon or aluminum carbon refractory brick powder, 9-15% of bentonite, 5-15% of wollastonite powder, 0-3% of graphite fine powder, 0.5-3.5% of phosphate and 0.01-2% of organic binder, wherein the particle sizes of the aluminum silicon carbide carbon or aluminum carbon refractory brick powder, the bentonite and the wollastonite powder are less than 200 meshes, and the powder and water are mixed according to the weight ratio of 1: 1, uniformly stirring and mixing, and then performing wet spraying on a slag-sticking surface to prepare a slag-sticking-preventing coating; the graphite material in the coating has the performance of being difficult to be infiltrated, and plays a role in isolating the slag from the wall of the device, thereby greatly reducing the bonding strength of the slag, facilitating the falling and cleaning of a slag adhering layer, achieving the purposes of reducing the slag cleaning difficulty, shortening the slag cleaning time, reducing the influence of the slag cleaning on the damage of the wall of the device, prolonging the service life of the device, reducing the maintenance cost and improving the turnover rate of the device. Although the technology is applied in actual production, the expected application effect of reducing the bonding strength of the sticky slag is achieved, the difficulty in mechanical cleaning of the sticky slag is reduced to a certain extent, the consumption cost of refractory materials increased by consumption of anti-sticking slag coatings in the molten iron KR stirring desulfurization process is slightly higher than the cost reduction brought by the service life extension of a stirring head, and therefore the molten iron KR stirring desulfurization process is forced to be stopped for use under the condition of a large trend of low-cost manufacturing in the steel industry.
The application number 201521132106.3 of the Chinese patent provides a stirring head cleaning device for molten iron desulphurization, which starts from reducing the labor intensity of manual slag removal, and discloses a cleaning device with scraping teeth arranged on two surfaces of a slag scraping plate, which are in contact with a stirring shaft and stirring blades, and also comprises a rotating body, a rotating arm, a connecting rod, a swing control device, a lifting control device, a first air cylinder and a second air cylinder, wherein the swing and the lifting of the slag scraping plate are controlled by the driving of the first air cylinder and the second air cylinder; through setting up the tooth of scraping in scraping sediment version bottom surface and side, can clear up the sediment of gluing of (mixing) shaft and stirring vane top surface simultaneously, prevent that the agitator from gluing the harm of sediment face and the reduction of stirring ability, through sweeping of sweeping the device in gluing the sediment clearance in-process, reach the effect of gluing the comprehensive clearance of sediment to the difficulty of artifical periodic cleaning has been avoided. However, due to the complex equipment and the difficulty in field installation, no report of actual production application is seen at present, and the specific implementation effect is not verified.
The Chinese patent document with the application number of 201910426130.4 provides a method for quickly cleaning sticky slag of a molten iron KR desulfuration stirrer, which starts from reducing the bonding strength of the sticky slag, and discloses a method for manually and mechanically removing the sticky slag after the sticky slag is hydrated and loosened on line.
Also, as shown in chinese patent application No. 201010156196.5, an on-line thermal cleaning method for accumulated accretions of mechanical desulfurization stirring paddles by KR method is disclosed, which discloses a method for melting and cleaning slag sticking, accumulated iron and accretions of stirring paddles by using high-temperature physical heat of molten iron, and specifically comprises the following 8 steps: (1) adding molten iron into a ladle; (2) inserting the nodulated stirring paddle into molten iron, wherein the depth of the inserted molten iron is more than or equal to 3990 mm; (3) rotating the stirring paddle at an initial rotation speed (20-30 r/min); (4) adding a desulfurizing agent into the molten iron; (5) accelerating the rotating speed to the highest rotating speed of 85-95 r/min (the stirring rotating speed for normal desulfurization is 100-120 r/min); (6) stirring for 20-45min at the highest rotating speed; (7) decelerating until stirring is stopped; (8) and (5) lifting the stirring paddle to finish the sticky slag cleaning. In addition, the mass of the molten iron entering the furnace is more than or equal to 170t, the temperature of the molten iron is more than or equal to 1320 ℃, when the size R of the accretion is 200-: lime powder 5-9kg/tIronFluorite 0.4-0.7kg/tIron0-0.5kg/t of aluminum slagIron. Through the steps, the non-productive maintenance operation time of the KR stirring desulfurization process is shortened, the online thermal-state slag/iron sticking/accumulated tumors of the stirrer are cleaned, and the purposes of prolonging the service life of the stirring paddle, reducing the consumption cost of refractory materials, shortening the non-productive operation time and improving the process production capacity are achieved. According to the report, the technology of the patent aims at melting and cleaning the sticky slag of the stirrer by high-temperature molten iron in one step, and although the aim of melting and cleaning the sticky slag of the stirrer on line can be theoretically achieved, and various defects caused by manual and mechanical cleaning of the sticky slag of the stirrer are avoided, according to the technical scheme in the patent, the effect of cleaning the sticky slag of the stirrer is difficult to ensure in actual production. The main reasons are that: a. the pre-slag of the molten iron is not removed in the step (1), so that the blast furnace slag amount of the molten iron liquid level is large, and the adhesion of a stirrer is easy to causeBlast furnace slag; b. adding the desulfurizer in the step (4) under the condition of initial low-rotation-speed (20-30 r/min) rotation stirring in the step (3), wherein stirring splashing of molten iron is restrained, but stirring vortex is not fully formed, so that the adding and winding of the desulfurizer are difficult, the desulfurizer impacts the liquid surface of the molten iron, rebounding flying dust escaping amount is large, and the effective utilization rate of the desulfurizer is reduced; c. under the condition that no molten iron pre-slag is removed in the step (1), the desulfurizing agent (lime powder is 5-9 kg/t) in the step (4)IronFluorite 0.4-0.7kg/tIron0-0.5kg/t of aluminum slagIron) The slag quantity and the slag layer thickness of the molten iron liquid level are further increased by adding a large amount of the slag in one step, so that the contact bonding area of the stirrer and the liquid level slag layer is enlarged, secondary slag adhesion of the stirrer is easily caused, and the online melting and cleaning effect of the slag adhesion of the stirrer is difficult to ensure; d. the stirring rotating speed for normal desulfurization is 100-120 r/min, under the condition of the slag removal stirring rotating speed (85-95 r/min) in the step (5), the stirring vortex is fully developed, a large amount of blast furnace slag and desulfurizer on the liquid level of molten iron are gathered to the center of the stirring vortex, the contact area of liquid level slag and a stirrer is further increased, and the secondary slag adhesion degree in the slag adhesion cleaning process is increased, which is also the main reason that the continuous stirring slag removal time in the step (6) is as long as 20-45min, the long-time stirring slag removal in the step (6) provides enough heat transfer time for heating and melting the sticky slag, but the long-time stirring greatly improves the temperature drop of the molten iron, brings adverse effects to the subsequent treatment of the molten iron and the heat balance of a converter, and is the main reason that the temperature of the slag removal molten iron is not lower than 1320 ℃ in the patent; because the slag removal rotating speed in the step (5) is lower than the normal rotating speed, the depth of the slag removal stirring vortex is smaller than the depth of the normal desulfurization stirring vortex, secondary slag adhesion is formed in a higher area of the shaft part of the stirrer, the slag is difficult to remove in the subsequent slag removal process, the slag grows continuously, and finally the slag can be removed only through manual mechanical slag removal; in addition, a large amount of desulfurizer is added in the step (4), the adding amount of the desulfurizer is equivalent to that of the desulfurizer for stirring desulfurization of normal molten iron KR, and analysis shows that the purpose of stirring desulfurization of molten iron can be achieved in the online melting and cleaning process of the sticky slag of the stirrer, however, the molten iron and the sticky slag must be contacted in the online melting and cleaning process of the sticky slag of the stirrer, so that the high-temperature molten iron is achievedThe heat transfer melting to the sticky slag, therefore, the stirring vortex depth can only be in the sticky slag part at the upper part of the stirrer blade, and under the conditions of not reducing the insertion depth of the stirrer and greatly improving the stirring rotating speed, even if the stirrer is stirred for a long time to remove the slag, the desulfurizer can not be involved in the molten iron to carry out desulfurization reaction, therefore, the patent technology can not achieve the dual purposes of online melting and cleaning the sticky slag of the stirrer and desulfurizing the molten iron; even if the technology can complete the on-line melting and cleaning of the sticky slag of the stirrer, the molten iron in the current tank still needs to be subjected to desulphurization pretreatment, so that the temperature drop of the molten iron is further increased, the quality of the molten iron entering the converter is reduced, and even the converter is difficult to add iron and the risk of iron coagulation in the tank is caused. Therefore, the technology of the patent is difficult to implement in actual production and difficult to estimate the implementation effect, and is a main reason that no actual production application report is seen so far.
In summary, in order to reduce the difficulty of online cleaning of the sticky slag of the KR desulfurization stirrer for molten iron, shorten the slag removal time, improve the operation rate of mechanical stirring desulfurization equipment for molten iron, improve the dynamic conditions of stirring desulfurization reaction, and the like, a great deal of research work is carried out by numerous scholars, including the aforementioned partial research results, although a good application effect is obtained in actual production, the manual mechanical slag removal cannot be thoroughly avoided. How to eliminate the deficiency of manual and mechanical slag removal of the slag adhered to the stirrer and realize the on-line reliable slag removal of the stirrer still needs further deep research.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, and provides the online cleaning method for the sticky slag of the KR desulfuration stirrer for the molten iron, which can improve the production efficiency of desulfuration equipment, improve the economic indexes of desulfuration technology and realize efficient, stable and deep desulfuration of the molten iron, without changing the existing equipment.
The technical problem to be solved can be implemented by the following technical scheme.
An online cleaning method for sticky slag of a KR desulfurization stirrer for molten iron comprises the following steps:
(1) weighing the molten iron received by the molten iron tank, conveying the molten iron tank to a slagging-off station of a desulfurization station, carrying out temperature measurement sampling and slagging-off of molten iron, wherein the exposed surface of the molten iron is required to be more than or equal to 2/3,and recording the temperature of the molten iron, the sulfur content before the molten iron is desulfurized and the weight of the molten iron; after the pre-slag is raked off, the molten iron liquid level is 0.3-0.5 kg/tIronAdding heat insulating agent;
(2) moving the molten iron tank to a desulfurization station, and adopting a molten iron tank liquid level detection device to detect the liquid level height of the molten iron tank on line, or adopting the existing one-key desulfurization process model to calculate the liquid level height of the molten iron tank according to the weight of the molten iron obtained in the step (1);
(3) when the on-line automatic cleaning of the sticky slag of the stirrer is implemented, the loading capacity of molten iron is required to be not lower than 90% of the rated loading capacity of the molten iron tank, and the temperature of the molten iron is required to be not lower than 1280 ℃;
(4) inserting a slag-bonding stirrer which needs to carry out on-line slag cleaning into molten iron, and ensuring that the depth L of the slag-bonding stirrer immersed in the vortex surface molten iron is not less than 50mm, and the height H of the bottom surface of the stirrer from the bottom of the tank is not less than 500 mm;
(5) controlling the stirring speed to 1/3-1/2 of normal desulfurization speed for rotary stirring, and stirring at 0.3-0.5 Kg/tIronAdding a desulfurizing agent into the molten iron liquid level, wherein the desulfurizing agent meets the following requirements in percentage by weight: CaO is more than or equal to 74 percent and CaF2≥5％、SiO2Less than or equal to 5 percent, less than or equal to 0.05 percent of S and less than or equal to 1 percent of water;
(6) keeping the stirring speed unchanged, stirring until the sticky slag of the stirrer is automatically melted and cleaned on line.
As a further improvement of the present technical solution, the method further comprises:
after the stirrer is used for melting and cleaning the sticky slag on line, stopping the rotation of the stirrer, and lifting the stirrer to the normal stirring desulfurization insertion depth; according to the weight of the molten iron, the sulfur content before molten iron desulfurization and the temperature of the molten iron recorded in the step (1), the temperature of the molten iron is corrected according to the temperature drop speed of the molten iron of 0.6-1 ℃/min and the slag removal stirring time in the online melting and cleaning process of the slag adhered to the stirrer, and the correction is carried out according to the weight of the molten iron, the sulfur content before molten iron desulfurization and the temperature of the molten iron, wherein the temperature of the molten iron is 4-10 Kg/tIronAdding a desulfurizer into the molten iron, adding the desulfurizer and stirring and desulfurizing the molten iron according to a normal desulfurization process until the stirring and desulfurizing are finished, and lifting the stirrer out of the molten iron tank to be in a waiting state.
As a further improvement of this solution, the method further comprises:
and after the molten iron desulfurization is finished, conveying the molten iron tank to a slag skimming station, carrying out temperature measurement sampling on the desulfurized molten iron, skimming slag, and then transferring to a converter for iron blending.
As one of the preferred embodiments of the present invention, the insulating agent in the step (1) is wood carbon particles or carbonized rice hulls.
Also as a preferred embodiment of the present invention, the stirring time in step (6) is 5 to 10 min.
By adopting the technical scheme, the sticky slag on-line cleaning method for the molten iron KR desulfurization stirrer improves the thermodynamics and dynamics conditions of on-line sticky slag melting and cleaning of the stirrer and high-efficiency desulfurization of the molten iron in the tank time through on-line quick melting and automatic cleaning of the sticky slag of the stirrer and step-by-step implementation of high-efficiency desulfurization of the molten iron in the tank time, effectively overcomes various defects caused by the sticky slag melting and cleaning under the conditions of large slag amount, high rotating speed and long time in the existing sticky slag on-line melting and cleaning technology of the stirrer, and achieves the dual purposes of on-line quick melting and cleaning of the sticky slag of the stirrer and high-efficiency desulfurization of the molten iron in the tank.
Drawings
FIG. 1 is a schematic view showing a state where a stirrer is not adhered with slag;
FIG. 2 is a schematic view showing a slag sticking condition of the stirrer;
FIG. 3 is a schematic view showing the insertion depth of the on-line slag-sticking melting cleaning stirrer;
FIG. 4 is a schematic view showing the state of the depth of insertion of the agitator during normal desulfurization.
In the figure: 1. slag sticking of a stirring shaft, 2 slag sticking between stirring blades, 3a stirrer, 4a molten iron tank, 5 molten iron liquid level in a static state, 6 molten iron.
Detailed Description
The following describes embodiments of the present invention in further detail with reference to the accompanying drawings.
The tracking of the forming process of the sticky slag of the stirrer for desulfurizing by the molten iron KR is visible, and the sticky slag of the stirrer is positioned at the stirring shaft part of the upper end surface area of the stirring blade; in the process of stirring and desulfurizing molten iron, the stirring vortex depth exceeds the upper end surface of a stirrer blade, the molten iron enters the deep part of the stirrer blade, a desulfurizing agent, desulfurized slag and molten iron residues which float on the liquid surface without being involved in the molten iron are gathered at the vortex bottom and are in contact with the surface of a stirring shaft, and the liquid surface residues (the desulfurizing agent, the desulfurized slag and the molten iron residues) are sintered and adhered at high temperature on the surface of the stirring shaft, precipitated, solidified and deposited and adhered with iron as the medium in a rigid revolving body of a stirring center does not move relatively, the heat dissipation of the vortex surface and the ventilation and cooling of compressed gas in the stirring shaft core, so that the viscous slag of the stirrer is formed; through the continuation of the continuous intermittent type formula of agitator in service, the continuous deposit of (mixing) shaft surface bonding thing bodiness, the sticky sediment has increased the weight of agitator on the one hand, endangers the rotatory dynamic balance of agitator, still makes stirring vortex to inhale the increase to the desulfurizer and hinders simultaneously, has seriously restricted the stirring of desulfurizer and has mixed and the desulfurization effect, therefore must clear away the sticky sediment that agitator thickness is big to keep stirring desulfurization's safety and stability production. Because the sticky slag is in a bonding form of multi-component oxide crystallization, solidification, deposition and iron coagulation adhesion, the sticky slag is compact and has high bonding strength, manual and mechanical slag removing and cleaning are very difficult after the sticky slag of the stirrer is cooled, the slag removing treatment time is long, the labor intensity is high, the operation environment is poor, the potential safety hazard is high, and the smooth execution of a molten iron desulphurization production plan is seriously influenced.
Referring to fig. 1 to 4, the online cleaning of the slag adhered to the stirring shaft 1 and the slag adhered to the stirring blades 2 of the stirrer 3 is mainly performed, and the molten iron 6 in the molten iron tank 4, that is, the molten iron liquid level 5 when the molten iron is stationary, is also illustrated.
The invention provides an on-line automatic cleaning method for sticky slag of a KR desulfuration stirrer of molten iron, which mainly comprises the following steps:
(1) weighing the molten iron received by the molten iron tank, conveying the molten iron tank to a slagging-off station of a desulfurization station, carrying out temperature measurement sampling and slagging-off before molten iron slagging-off, requiring the exposed surface of the molten iron to be more than or equal to 2/3, and recording the temperature of the molten iron, the sulfur content before the molten iron and the weight of the molten iron; after the pre-slag is raked off, the molten iron liquid level is 0.3-0.5 kg/tIronThe thermal insulation agent of the wood carbon particles or the carbonized rice hulls is paved according to the adding proportion;
(2) moving the hot metal ladle to a desulfurization station, and adopting a hot metal ladle liquid level detection device to detect the liquid level height of the hot metal ladle on line, or adopting the existing one-key desulfurization process model for desulfurization to calculate the liquid level height of the hot metal ladle according to the weight of the hot metal;
(3) when the on-line automatic cleaning of the sticky slag of the stirrer is implemented, the loading capacity of molten iron is required to be not lower than 90% of the rated loading capacity of the molten iron tank, and the temperature of the molten iron is required to be not lower than 1280 ℃;
(4) inserting a slag-bonding stirrer which needs to carry out on-line slag cleaning into molten iron, and ensuring that the depth L of the slag-bonding stirrer immersed in the vortex surface molten iron is not less than 50mm, and the height H of the bottom surface of the stirrer from the bottom of the tank is not less than 500 mm;
(5) controlling the stirring speed to 1/3-1/2 of normal desulfurization speed for rotary stirring, and stirring at 0.3-0.5 Kg/tIronAdding a desulfurizing agent to the molten iron liquid surface, wherein the desulfurizing agent comprises the following components in percentage by weight: CaO is more than or equal to 74 percent, CaF2≥5％，SiO2Less than or equal to 5 percent, less than or equal to 0.05 percent of S and less than or equal to 1 percent of water;
(6) keeping the stirring speed unchanged, stirring for 5-10 min, and completing on-line automatic melting and cleaning of the sticky slag of the stirrer;
(7) after the stirrer is used for melting and cleaning the sticky slag on line, stopping the rotation of the stirrer, and lifting the stirrer to the normal stirring desulfurization insertion depth; according to the weight of the molten iron, the sulfur content before the molten iron and the temperature of the molten iron recorded in the step (1), correcting the temperature of the molten iron according to the temperature drop speed of the molten iron of 0.6-1 ℃/min and the slag removal stirring time in the online melting and cleaning process of the slag adhered to the stirrer, and calculating the addition of a desulfurizing agent by adopting the conventional one-key desulfurization process model, wherein the addition is generally 4-10 Kg/tIronAdding a desulfurizer and stirring and desulfurizing molten iron according to a normal desulfurization process until the stirring and desulfurizing are finished, lifting the stirrer out of the molten iron tank, and raising the stirrer to a waiting state, so that the stirring and desulfurizing of the molten iron in the current tank are finished after the stirrer is automatically melted and cleaned on line;
(8) and after the molten iron desulfurization is finished, conveying the molten iron tank to a slag skimming station, carrying out temperature measurement sampling on the desulfurized molten iron, skimming slag, and then transferring to a converter for iron blending.
Therefore, the aim of firstly carrying out on-line automatic melting and cleaning of the sticky slag of the stirrer under the condition of less slag and then carrying out stirring and desulphurization on the molten iron by utilizing the molten iron in one tank is achieved.
According to the steps, the stirrer sticky slag online melting automatic slag removal industrial test is successively carried out at 100-ton, 200-ton and 300-ton hot metal ladle KR desulfurization stations, compared with the conventional stirrer sticky slag manual pneumatic pick slag removal cleaning method, the stirrer sticky slag single slag removal time is shortened by 80%, all defects of manual pneumatic pick slag removal are avoided, the double test targets of online automatic rapid cleaning and ladle time high-efficiency desulfurization are achieved, the influence of the stirrer sticky slag manual mechanical slag removal on the production rhythm is remarkably reduced, the adverse influence of the stirrer sticky slag on the hot metal stirring desulfurization reaction dynamics is effectively relieved, and the technical requirements of high-efficiency stable production and converter high-efficiency smelting of hot metal KR stirring desulfurization are met.
Meanwhile, through on-site sampling analysis of the sticky slag of the stirrer, the chemical components in the KR sticky slag of the lime system desulfurizer are found as shown in the following table 1, so that the differences of the chemical components of the sticky slag of the stirrer are large, particularly the TFe content, because the conditions for stirring the desulfurized molten iron by the KR of the molten iron of different manufacturers are different from the composition of the desulfurizer, wherein the TFe is mainly metallic iron, but the types of the main components are basically the same, and the TFe content is found to be reduced along with the increase of the temperature of the desulfurized pretreated molten iron through the statistics of the average temperature of the desulfurized pretreated molten iron of different enterprises.
For the multi-element oxide system of the slag adhering of the KR stirrer of the molten iron, the main phases are tricalcium silicate (C3S), dicalcium silicate (C2S), tricalcium aluminate (C3A), hepta-aluminum dodecacalcium (C12A7) and tetracalcium aluminoferrite (C4AF), the slag adhering has no fixed melting point, the complete melting temperature is higher and is far higher than the conventional pretreatment temperature of the molten iron; furthermore, for CaO and CaF2The lime-based desulfurizer is prepared in the temperature range of 1345 ℃ to 1360 ℃ (equivalent to CaO-CaF)2The initial melting temperature of eutectic in the phase diagram, namely the complete solidification temperature of the melt), can generate regional melting to form a multi-element melt, and other components in the sticky slag also have the effect of reducing the melting point of CaO. In addition, although the melting point of pure iron is as high as 1538 ℃, the solidification temperature is less than 1200 ℃ for carbon-saturated molten iron. Therefore, for the sticky slag of the stirrer with high content of the iron coagulation and a plurality of composite oxides, the melting of the region of the iron coagulation can be realized when the temperature is higher than 1200 ℃, the melting of the region of the plurality of oxides in the sticky slag can also be realized when the temperature is higher than 1280 ℃,therefore, the high enough temperature is the necessary condition for melting and removing the sticky slag of the stirrer.
Table 1: chemical composition of slag sticking of stirrer
| Name of article | SiO2 | Al2O3 | CaO | MgO | TiO2 | TFe |
| Steel works A | 9.66 | 3.57 | 43.35 | 1.20 | 0.40 | 27.19 |
| Steel works B | 3.3 | 0.31 | 22.71 | 0.51 | 0.31 | 76.37 |
| Steel works C | 5.94 | 0.51 | 21.46 | 0.80 | 0.19 | 64.70 |
| Steel works D | 19.84 | 3.48 | 44.86 | 0.22 | 1.35 | 25.57 |
According to the physical and chemical properties of the sticky slag of the stirrer, the temperature condition of molten iron for online molten iron melting and removing of the sticky slag of the stirrer is set, namely: the temperature of molten iron is more than or equal to 1280 ℃, so that the regional melting of the sticky slag and the iron coagulation and the multi-element oxide and the cleaning of the sticky slag melting loss of the stirrer are realized.
Based on the KR desulfurization stirrer slag bonding forming process, the analysis result of the physical and chemical properties of the bonded slag and the basic principle of high-temperature melting and cleaning of the bonded slag of the stirrer, the residual amount of the molten iron blast furnace slag is reduced by removing the front slag of the molten iron, and the formation of secondary bonded slag in the process of stirring, melting and cleaning of the bonded slag is inhibited; the temperature condition of the region melting of the slag-bonding iron and the multi-element oxide of the stirrer is ensured by the limitation of the slag-bonding melting temperature condition that the temperature of the molten iron is more than or equal to 1280 ℃; the technical measures of paving the heat insulating agent of the wood carbon particles or the carbonized rice hulls on the molten iron liquid surface are established, the light wood carbon particles or the carbonized rice hulls are used for covering and insulating the blast furnace slag remained on the molten iron liquid surface, the surface radiation and convection heat loss of the liquid surface slag are blocked, the heat dissipation temperature drop of the liquid surface slag is reduced, and the heat compensation is realized by the contact combustion of the plant carbon in the heat insulating agent at the upper layer and the air, so that the melting strips of the liquid surface slag are ensuredThe secondary slag sticking of the stirrer formed by cooling and solidifying the liquid level slag is avoided. The method ensures the sufficient molten iron depth when the sticky slag of the stirrer is melted and cleaned on line by limiting the loading capacity of the molten iron to be not less than 90 percent of the rated loading capacity of the molten iron tank, and ensures the realization of the conditions that the sticky slag of the stirrer is immersed in the molten iron with the vortex surface, the depth L of the sticky slag of the stirrer is not less than 50mm, and the height H of the bottom surface of the stirrer from the bottom surface of the tank is not less than 500 mm; the technical measure that the slag removal speed of the stirrer is 1/3-1/2 of the normal desulfurization speed is established, the rapid loss cleaning of the molten sticky slag is ensured through the speed difference between the wall surface of the stirrer and the molten iron, the problems of the exposure of the sticky slag of the stirrer and the incomplete cleaning of the sticky slag caused by deep vortex at high speed are avoided, the central aggregation of a heat insulating agent is also prevented, the coverage area of the heat insulating agent on the molten iron liquid level is expanded, and the temperature drop of the molten iron is reduced; 0.3-0.5 Kg/t of molten iron is added to the liquid level of molten ironIronThe desulfurizer utilizes the high alkalinity of the desulfurizer to adjust the alkalinity of slag formed by the separation and combination of the residual blast furnace slag and the plant carbon ash in molten iron, reduces the comprehensive slag melting point of the liquid level, and prevents secondary slag adhesion of the stirrer.
By the measures, the proper viscous slag melting and cleaning conditions such as small liquid level slag amount, low melting point, quick viscous slag melting and loss, low iron water temperature and the like in the online melting and cleaning process of the viscous slag of the stirrer are realized; the stirrer is continuously stirred for 5-10 min at a low speed, so that proper slag adhesion and loss cleaning time of the stirrer are ensured, and the purpose of online rapid automatic melting and cleaning of the stirrer adhesion slag is achieved.
After the stirrer slag is melted and cleaned on line, the invention sets a measure for lifting the stirrer to the normal stirring desulfurization insertion depth in step (7), under the condition of normal desulfurization stirring rotating speed, the stirring vortex is deeply inserted into the blade of the stirrer in the desulfurization process, so that the desulfurizing agent is smoothly drawn into the deep part of the molten iron to carry out mixed contact desulfurization reaction, furthermore, in the step (7) of the invention, a correction measure of the molten iron parameters before desulfurization is formulated according to the on-line melting and cleaning history process of the sticky slag of the stirrer, the accuracy of the setting of the desulfurization process parameters is ensured, in addition, the oxidizing property of the molten slag is also reduced under the action of the reducing agent of the plant carbon, thereby improving the thermodynamic condition of molten iron desulphurization, realizing the efficient desulphurization pretreatment of the molten iron in the tank after the on-line melting and cleaning of the sticky slag of the stirrer, and ensuring the stability of the quality and the production rhythm of the molten iron charged into the converter.
The method for automatically cleaning sticky slag of the KR desulfurization stirrer of molten iron provided by the invention has the advantages that under the condition of not changing the existing equipment, through reasonable selection of molten iron conditions, the technical scheme of online melting and cleaning of sticky slag of the stirrer and optimization of connection with the conventional stirring desulfurization process, the online melting and cleaning of sticky slag of the stirrer and the step-by-step implementation of stirring desulfurization of molten iron in a tank are realized by utilizing one tank of molten iron, various defects of high labor intensity, long slag cleaning time, severe operating environment, high potential safety hazard and the like of manual and mechanical slag striking of sticky slag of the stirrer are overcome, the problems of easy secondary sticky slag cleaning, long sticky slag cleaning time, large molten iron temperature reduction and the like of large-slag online melting and cleaning in the prior art are avoided, and the aims of improving the production efficiency of desulfurization equipment, improving the economic index of desulfurization technology and efficiently stabilizing and deeply desulfurizing molten iron are achieved.
Claims (5)
1. The online cleaning method for the sticky slag of the KR desulfurization stirrer for the molten iron is characterized by comprising the following steps of:
(1) weighing the molten iron received by the molten iron tank, conveying the molten iron tank to a slagging-off station of a desulfurization station, carrying out temperature measurement sampling and slagging-off before molten iron slagging-off, requiring the exposed surface of the molten iron to be more than or equal to 2/3, and recording the temperature of the molten iron, the sulfur content before molten iron desulfurization and the weight of the molten iron; after the pre-slag is raked off, the molten iron liquid level is 0.3-0.5 kg/tIronAdding heat insulating agent;
(2) moving the hot metal ladle to a desulfurization station, and adopting a hot metal ladle liquid level detection device to detect the liquid level height of the hot metal ladle on line, or calculating the liquid level height of the hot metal ladle according to the weight of the hot metal obtained by weighing in the step (1);
(3) when the online cleaning of the sticky slag of the stirrer is implemented, the loading capacity of molten iron is required to be not lower than 90% of the rated loading capacity of the molten iron tank, and the temperature of the molten iron is required to be not lower than 1280 ℃;
(4) inserting a slag-bonding stirrer which needs to carry out on-line slag cleaning into molten iron, and ensuring that the depth L of the slag-bonding stirrer immersed in the vortex surface molten iron is not less than 50mm, and the height H of the bottom surface of the stirrer from the bottom of the tank is not less than 500 mm;
(5) 1/3 for controlling stirring speed to be normal desulfurization speed1/2, and stirring the mixture at a rate of 0.3 to 0.5Kg/tIronAdding a desulfurizing agent into the molten iron liquid level, wherein the desulfurizing agent meets the following requirements in percentage by weight: CaO is more than or equal to 74 percent and CaF2≥5％、SiO2Less than or equal to 5 percent, less than or equal to 0.05 percent of S and less than or equal to 1 percent of water;
(6) keeping the stirring speed unchanged, stirring until the sticky slag of the stirrer is automatically melted and cleaned on line.
2. The online cleaning method for the sticky slag of the KR desulfuration stirrer for the molten iron as claimed in claim 1, further comprising the following steps:
after the stirrer is used for melting and cleaning the sticky slag on line, stopping the rotation of the stirrer, and lifting the stirrer to the normal stirring desulfurization insertion depth; according to the weight of the molten iron, the sulfur content before molten iron desulfurization and the temperature of the molten iron recorded in the step (1), the temperature of the molten iron is corrected according to the temperature drop speed of the molten iron of 0.6-1 ℃/min and the slag removal stirring time in the online melting and cleaning process of the slag adhered to the stirrer, and the correction is carried out according to the weight of the molten iron, the sulfur content before molten iron desulfurization and the temperature of the molten iron, wherein the temperature of the molten iron is 4-10 Kg/tIronAdding a desulfurizer into the molten iron, adding the desulfurizer and stirring and desulfurizing the molten iron according to a normal desulfurization process until the stirring and desulfurizing are finished, and lifting the stirrer out of the molten iron tank to be in a waiting state.
3. The online cleaning method for the sticky slag of the KR desulfuration stirrer for the molten iron as claimed in claim 2, is characterized by further comprising the following steps:
and after the molten iron desulfurization is finished, conveying the molten iron tank to a slag skimming station, carrying out temperature measurement sampling on the desulfurized molten iron, skimming slag, and then transferring to a converter for iron blending.
4. The online cleaning method for the sticky slag of the KR desulfuration stirrer for the molten iron as claimed in claim 1, 2 or 3, wherein the heat preservation agent in the step (1) is wood carbon particles or carbonized rice hulls.
5. The online cleaning method for the sticky slag of the KR desulfuration stirrer for the molten iron as claimed in claim 1, 2 or 3, wherein the stirring time in the step (6) is 5-10 min.
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| CN114574660A (en) * | 2022-02-21 | 2022-06-03 | 山东钢铁股份有限公司 | KR intelligent control method based on-demand desulfurization |
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Application publication date: 20211221 |