CN114959156B - Method for thermal state tempering and modification of molten iron desulphurization slag - Google Patents
Method for thermal state tempering and modification of molten iron desulphurization slag Download PDFInfo
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- CN114959156B CN114959156B CN202110198166.9A CN202110198166A CN114959156B CN 114959156 B CN114959156 B CN 114959156B CN 202110198166 A CN202110198166 A CN 202110198166A CN 114959156 B CN114959156 B CN 114959156B
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- slag
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- molten iron
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- desulfurization
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- 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
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B3/00—General features in the manufacture of pig-iron
- C21B3/04—Recovery of by-products, e.g. slag
- C21B3/06—Treatment of liquid slag
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- 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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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B2400/00—Treatment of slags originating from iron or steel processes
- C21B2400/02—Physical or chemical treatment of slags
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
Abstract
The method for thermal state tempering modification of the molten iron desulphurization slag is characterized in that the metallurgical crane structures of a desulphurization slag tank, a converter slag tank and a converter slag treatment field are subjected to compatibility design or improvement, so that the converter slag and the molten iron desulphurization slag are mixed in the desulphurization slag tank, the molten iron desulphurization slag is subjected to thermal state tempering modification, and the operation process can run stably and smoothly; in order to prevent large-area radiation heat dissipation of the tank opening of the desulfurization slag tank, the desulfurization slag tank is designed by a capping, so that heat dissipation of hot molten iron desulfurization slag is greatly avoided; further, the desulfurization slag pot is heated before the desulfurization slag pot is connected with slag, quenching after molten iron desulfurization slag falls into the desulfurization slag pot is reduced, heat loss in the operation process is compensated, thermal modification of the molten iron desulfurization slag is more sufficient, caking difficult-to-process characteristics of the molten iron desulfurization slag are changed, and the molten iron desulfurization slag is converted into easy-to-process converter slag for subsequent treatment. The method can effectively avoid the formation of large lump of the molten iron desulphurization slag, and the modification of the molten iron desulphurization slag is more complete and sufficient.
Description
Technical Field
The invention relates to the technical field of desulfurization slag modification treatment, in particular to a hot tempering modification method of molten iron desulfurization slag.
Background
After the iron and steel industry enters the era of fine product and cost double constraint, iron and steel enterprises have already used a molten iron pretreatment technology as a necessary procedure to manufacture competitive fine product steel, and molten iron desulfurization is used as the most main pretreatment technology, so that the treatment and disposal problems of molten iron desulfurization slag are brought while satisfactory molten iron reception of a converter is obtained. In general, the amount of molten iron desulphurization slag accounts for about 2% of the molten iron, and the properties of the desulphurization slag often cause large lump of slag iron, while the traditional desulphurization slag treatment process is to soak the slag by water, then crush, screen and magnetically separate the slag, thereby not only causing atmospheric pollution of slag sites, but also requiring sewage treatment, leading to high treatment cost and seriously affecting the green reputation of steelworks.
Therefore, a new idea and method are needed to break up the lump of the iron slag and make the iron slag easy to separate. The hot state modification is carried out on the molten iron desulphurization slag, so that the molten iron desulphurization slag is converted into a well-processed resource product, and a new technical path is formed.
Chinese patent CN981005675 discloses a molten iron desulphurization slag modifier, which comprises the following components in percentage by weight: na (Na) 2 CO 3 ：35～50％，SiO 2 ：35～50％，CaF 2 : 8-15% of the additive is added into molten iron after being independently prepared, and the cost of raw materials and process equipment is required to be additionally increased.
Chinese patent CN2014107573343 discloses a "method for modifying and treating blowing desulfurization slag", which requires that a slag pot for receiving slag from a converter is used to receive full blowing desulfurization slag, then the slag pot is transported to a slag field of the converter, the full pot blowing desulfurization slag is added into 2-5 empty slag pots uniformly, then the slag pots added with blowing desulfurization slag are placed on a slag discharging car of the converter, and then the slag pot is transported to the lower part of the converter to be connected with liquid steel slag. The mode needs the distance between lifting lugs of a travelling crane and the width of a lifting hook to be equal and is suitable for trunnions of a desulfurization slag tank and a converter slag tank, but the size difference of the two tanks of a ferrous metallurgy enterprise is obvious, and the distance between the trunnions is not equal; in addition, the slag discharging time of the converter is limited, the logistics matching is very tight, the pouring of converter slag to a plurality of slag tanks is impossible, thus the slag discharging time of the converter and the operation difficulty of the slag tank truck and the converter in cooperation slag discharging are greatly prolonged, and the method is not practical.
Chinese patent CN2018101641542 discloses a "hot mixing treatment method and application of desulfurization slag and converter slag", which is applied to a dry slag stewing pit, and the method is to pour KR desulfurization slag into the slag stewing pit, then to lay liquid converter slag on the upper surface of KR desulfurization slag, to perform slag-turning mixing, and hopefully to obtain mixed slag iron in the slag stewing pit. The problem that the running is simultaneously suitable for the KR desulfurization slag tank and the converter slag tank is also solved, and the effective obtaining rate of the mixed slag iron is not very high in practice, because a reaction space and a container are not provided, the liquid converter slag is just splashed on the KR desulfurization slag, the space heat dissipation is serious, the reaction area between the two slag is limited, and the reaction effect between the two slag is difficult to be satisfactory; however, any steel machine cannot contact high-temperature slag for a long time, so that the operation is difficult in practice, and the modification purpose cannot be achieved.
At present, when modified molten iron desulfurization slag is scraped to a slag pot by a slag raking machine, the slag pot is usually a steel casting, the mouth is large, the bottom is small, and the inner wall and the outer wall are free of refractory materials, so that molten iron treatment is always a temperature drop process, and after the desulfurization slag is scraped from molten iron, the desulfurization slag is basically in a thick semi-solid state, enters an open uncovered metal slag pot and is subjected to severe cooling immediately, and a plurality of bags of molten iron slag are usually connected to one slag pot. Therefore, when a few ladle of molten iron slag is removed, the fault in the slag pot is in a layer-by-layer lamination state, and slag iron tends to be coagulated into large lumps after being treated in a slag field, so that great trouble is caused for subsequent treatment.
Disclosure of Invention
The invention aims to provide a hot quenching and tempering modification method for hot molten iron desulphurization slag, which is characterized in that hot molten iron desulphurization slag in a slag pot is mixed with liquid converter slag to carry out hot quenching and tempering, so that heat loss of the hot molten iron desulphurization slag is reduced, the caking difficult processing characteristic of the molten iron desulphurization slag is changed, and the hot molten iron desulphurization slag is converted into easy-to-process converter slag for subsequent treatment.
In order to achieve the above purpose, the technical scheme of the invention is as follows:
a hot quenching and tempering modification method for molten iron desulphurization slag comprises the following steps:
1) Job preparation
Configuring a plurality of desulfurization slag tanks and converter slag tanks, and carrying out compatibility design or improvement on the structures of the desulfurization slag tanks, the converter slag tanks and the metallurgical cranes of the converter slag treatment field, so that the desulfurization slag tanks and the converter slag tanks can be lifted, turned over, inverted and buckled by the metallurgical cranes of the converter slag treatment field; a slag holding tank truck or a desulphurized slag tank truck is arranged between the converter slag treatment field and the molten iron slag skimming station and is used for transporting the desulphurized slag tank; setting a molten iron desulfurization slag and converter slag mixing station in a converter slag treatment field; the converter slag tank is transported by adopting a converter slag tank truck; the desulfurization slag tank adopts a desulfurization slag tank with a cover, and is additionally provided with a cover adding and uncovering machine, and the cover adding and uncovering machine is utilized to cover or uncover the desulfurization slag tank;
2) Slag receiving device
After the desulfurization of the molten iron is completed, transporting the desulfurization slag pot to a molten iron slag skimming station for slag receiving, covering the desulfurization slag pot by using a cover adding and uncovering machine after the slag receiving is completed, transporting the desulfurization slag pot to a converter slag treatment field by the slag skimming car or the desulfurization slag pot, and hoisting the desulfurization slag pot to a molten iron desulfurization slag and converter slag mixing station by using a metallurgical crane; after the slag receiving is finished, the molten iron desulfurization slag in the desulfurization slag tank accounts for 10-40% of the total volume of the desulfurization slag tank;
the converter slag pot is transported to the lower part of the converter by a converter slag pot car for receiving slag, and is transported to a converter slag treatment field by a converter slag pot car after the slag receiving of the converter slag pot is finished; after the completion of slag receiving, the converter slag in the converter slag tank accounts for 15-20% of the total volume of the converter slag tank;
3) Mixing and blending
After the converter slag tank reaches a converter slag treatment field, the converter slag tank is lifted by a metallurgical crane to be transferred to a molten iron desulfurization slag and converter slag mixing station, and a cover of the desulfurization slag tank is opened by a cover adding and removing machine, and after the converter slag tank is transferred to the upper part of the desulfurization slag tank, liquid converter slag is poured into the desulfurization slag tank, so that the molten iron desulfurization slag is subjected to thermal-state tempering modification, and similar converter slag is formed; the weight of the molten iron desulphurization slag is 30-100% of the weight of the converter slag;
4) Post-treatment
And the converter slag-like obtained after mixing is treated according to a conventional converter slag treatment process.
Further, in the step 2), the converter slag treatment field is provided with a baking station, preheating and turnover cooling are carried out on the desulfurization slag tank before the desulfurization slag tank is put into use, and before the desulfurization slag tank is conveyed to the molten iron slag skimming station, the desulfurization slag tank is conveyed to the baking station for preheating or heat supplementing, and the temperature after preheating or heat supplementing of the desulfurization slag tank is 300-500 ℃.
And after preheating or supplementing the heat of the desulfurization slag pot, capping the desulfurization slag pot by using a capping and uncapping machine, conveying the desulfurization slag pot to a molten iron slag skimming station by using a holding tank car or a molten iron desulfurization slag tank car to wait for slag receiving, and opening the cap by using the capping and uncapping machine before slag receiving.
Preferably, the preheating or complementary heating mode is induction heating, flame baking, resistance heating or plasma heating.
Preferably, in the step 3), after the liquid converter slag in the converter slag tank is poured out, the converter slag tank is hoisted back to the slag tank car by a metallurgical crane, and the slag tank car is transported back to the converter for the next slag receiving and recycling.
Preferably, in the step 4), the converter slag-like waste is lifted to a molten iron desulfurization slag and converter slag mixing station by a metallurgical crane according to a conventional converter slag treatment process, a cover adding and uncovering machine is used for covering the desulfurization slag tank, and then the converter slag-like waste is lifted to the desulfurization slag tank truck by a tank holding truck or a metallurgical crane to be conveyed to the molten iron slag skimming station, and the next round of circulation is started.
Preferably, in the step 4), the converter-like slag is lifted to a baking station by a metallurgical crane according to a conventional converter slag treatment process to supplement heat, the converter-like slag is capped by a capping machine after supplementing heat, and then is lifted to a molten iron and desulfurizing slag tank truck by a tank holding truck or a metallurgical crane to be conveyed to a molten iron and desulfurizing slag tank truck to a molten iron and slag skimming station, and the next round of circulation is started.
Preferably, in the step 3), after the molten iron desulfurization slag is mixed with the converter slag, when the slag surface of the mixed slag is calm and the temperature is above 1400 ℃, the mixed slag in the hot desulfurization slag tank is poured into the rotary furnace slag tank, namely secondary deslagging.
Preferably, the distance between the molten iron desulfurization slag and the converter slag mixing station and the molten iron slag skimming station and the converter is 20-200 m.
Preferably, in the step 3), after the slag receiving is finished, the molten iron desulfurization slag in the desulfurization slag tank accounts for 10-40% of the total volume of the desulfurization slag tank.
Preferably, in the step 3, after the completion of the slag receiving, the converter slag in the converter slag tank accounts for 15-20% of the total volume of the converter slag tank.
Preferably, the cover of the desulfurization slag pot is made of refractory casting materials built in a heat-resistant steel or ordinary carbon steel frame.
Preferably, the cover adding and uncovering machine is arranged to be movable and moves along with the desulfurization slag tank, or the baking station of the converter slag treatment field, the mixing station of molten iron desulfurization slag and converter slag and the molten iron slag removing station are all provided with a cover adding and uncovering machine.
Preferably, in the step 3), the temperature of the molten iron desulphurization slag is 1200-1400 ℃, the temperature of the converter slag is 1400-1700 ℃, and the viscosity of the converter slag is below 0.1 Pa.s.
The related structures of the desulfurization slag pot, the converter slag pot and the metallurgical crane of the converter slag treatment field are designed or improved in compatibility, so that the desulfurization slag pot and the converter slag pot can be lifted, turned over, deslagged and buckled by the metallurgical crane on the converter slag treatment field. And a molten iron desulfurization slag and converter slag mixing station is arranged in the converter slag treatment field and used for carrying out thermal state tempering modification on the molten iron desulfurization slag. The slag holding tank car or the desulphurized slag tank car is arranged between the converter slag treatment field and the molten iron slag skimming station and is used for placing and moving away the empty or heavy desulphurized slag tank on the appointed station and transporting the desulphurized slag tank between the related stations, so that the transportation of the desulphurized slag tank between the converter slag treatment field and the molten iron slag skimming station is facilitated.
Storing a plurality of desulfurization slag tanks and converter slag tanks in a converter slag treatment field; after molten iron desulfurization is completed, the desulfurization slag pot is transported to a molten iron slag skimming station by a slag holding car or a desulfurization slag pot car to wait for slag receiving, and after the desulfurization slag pot is connected with specified slag quantity, the desulfurization slag pot is covered by a cover adding and removing machine, so that the large-area radiation heat dissipation of hot desulfurization slag is prevented, and the heat dissipation of the hot desulfurization slag is avoided as much as possible. The ladle car or the molten iron desulfurization slag ladle car carries the desulfurization slag pot with the cover to a converter slag treatment field, and then the desulfurization slag pot with the cover is hoisted to a molten iron desulfurization slag and converter slag mixing station by a metallurgical crane to wait for mixing with the converter slag.
The converter slag tank is transported to the lower part of the converter by a converter slag tank car to wait for slag tapping, and after the slag tapping of the converter is finished, the converter slag tank is transported to a converter slag treatment field by a converter slag tank car. The converter slag pot is sent to a converter slag treatment field, and a metallurgical crane lifts the converter slag pot to the position above the desulfurization slag pot; when the converter slag tank moves to the mixing station, a cover adding and uncovering machine takes down a tank cover on the desulfurization slag tank; after the converter slag pot moves to the upper part of the desulfurization slag pot, the metallurgical crane adjusts the relative azimuth, distance and angle between the two pots, and after the metallurgical crane is suitable, the converter slag pot is tilted, the liquid converter slag in the converter slag pot is poured into the desulfurization slag pot below, and the two hot slag in the desulfurization slag pot are subjected to mixing reaction.
After the mixed slag in the desulfurization slag tank reacts for a period of time, the molten iron desulfurization slag is converted into converter slag, the slag-iron bonding state is eliminated, the mixed slag is in a sintered loose state, steel and slag are easy to separate, and then the mixed slag in the desulfurization slag tank is treated according to the conventional treatment procedure of the converter slag; adopting hot splashing, a roller and hot disintegrating to treat the follow-up converter slag, gradually realizing slag-iron separation, returning the obtained iron to production and using, and selling the tailings.
In order to ensure that the molten iron desulphurization slag is fully modified, after the molten iron desulphurization slag and the converter slag are mixed and reacted for a period of time, the temperature of the mixed slag can be kept above 1400 ℃, and the formed mixed slag still has enough heat and can be poured, so that the mixed slag in the desulphurization slag tank can be optionally poured into the converter slag tank again, namely secondary deslagging, and the reaction medium in the molten iron desulphurization slag and the converter slag can be added with a process of contact stirring again through secondary deslagging, thereby further promoting the complete modification.
In order to further keep hot state of molten iron desulfurization slag during mixing, a baking station is arranged in a converter slag treatment field, heating modes such as induction heating, flame baking, resistance heating or plasma heating are adopted to preheat or supplement heat to the desulfurization slag tank, the temperature of the desulfurization slag tank after preheating or supplementing heat is 300-500 ℃, the warm state of the desulfurization slag tank is maintained, the quenching of molten iron desulfurization slag after falling into the desulfurization slag tank is reduced, the heat loss in the operation process is made up, the hot state of the desulfurization slag tank is always kept, and guarantee and support are provided for secondary mixing of mixed slag in the desulfurization slag tank and then poured into the converter slag tank, so that the hot state modification of the molten iron desulfurization slag is more sufficient.
If the emptied desulfurization slag pot needs baking or heat supplementing, returning the empty desulfurization slag pot to a baking station by a metallurgical crane, covering by a covering and uncovering machine after baking, and hanging the warm empty desulfurization slag pot with the cover onto a desulfurization slag pot truck by the metallurgical crane to return to a molten iron slag-off station or directly returning to the molten iron slag-off station by a holding pot truck; if baking or heat supplementing is not needed, the empty desulfurization slag pot can be covered by a cover-covering and uncovering machine and then directly returned to the molten iron slag-removing station by the ladle car or lifted onto the desulfurization slag car by a metallurgical crane and then returned to the molten iron slag-removing station by the car; when the ladle desulfurization is finished and the empty ladle desulfurization slag pot with the cover is ready for receiving slag, the cover of the desulfurization slag pot is taken down by the cover adding and uncovering machine, slag receiving is started, and a second round of circulation is started. The emptied converter slag pot is hoisted on a converter slag pot by a metallurgical crane and then is transported back to the lower part of the converter to wait for the next round of slag receiving.
The cover adding and uncovering machine can be movable and moves along with the desulfuration slag pot; or fixed, a set of stations needing to be covered and uncovered are arranged.
The oil pipe of the tank truck and the like adopt a comprehensive protection design, so that the safety problem caused by oil evaporation and high-temperature slag splashing is avoided.
The invention has the following advantages:
the invention firstly reasonably improves and designs related mechanisms such as a desulfurization slag pot, a converter slag pot, a metallurgical crane of a converter slag treatment field and the like, so that the desulfurization slag pot and the converter slag pot can be lifted, turned over and buckled by the metallurgical crane on the converter slag treatment field, and the production line is correspondingly adjusted, thereby overcoming the defects of larger shape gap between the existing desulfurization slag pot and the converter slag pot, inconvenient blending operation and incapability of realizing modification of molten iron desulfurization slag and converter slag in a thermal state.
In order to further realize thermal state tempering modification of the molten iron desulphurization slag and the converter slag, the design of capping the desulphurization slag tank in the treatment process prevents the thermal state molten iron desulphurization slag from radiating and radiating in a large area, and avoids the heat loss of the thermal state molten iron desulphurization slag as much as possible; further, preheating and turnover cooling are carried out before the desulfurization slag pot is put into use, and then heat is supplemented, so that quenching after molten iron desulfurization slag falls into the desulfurization slag pot is reduced, heat dissipation in the operation process of the desulfurization slag pot is compensated, the thermal state of the desulfurization slag pot is always maintained, and thermal state modification of the molten iron desulfurization slag is more sufficient.
According to the method for modifying the molten iron desulphurization slag in a thermal state, large lump formation of the desulphurization slag iron is avoided, the molten iron desulphurization slag can be converted into converter slag, the conventional converter slag treatment method can be adopted for subsequent treatment, and the resource utilization value of the desulphurization slag is improved.
Drawings
FIG. 1 is a schematic diagram of a process device for baking and covering and uncovering a desulfurization slag pot.
FIG. 2 is a schematic structural view of a slag receiving device of the desulfurization slag pot at a molten iron slag removing station.
FIG. 3 is a schematic diagram of a slag ladle being transported between a molten iron slag skimming station and a converter slag handling site by a ladle car.
Fig. 4 is a schematic view of a converter slag ladle being transported between a converter and a converter slag handling site by a converter slag ladle car.
FIG. 5 is a schematic diagram of the structure of the device for mixing the molten iron desulphurization slag and the converter slag at the mixing station.
FIG. 6 is a schematic diagram of the structure of the apparatus for post-treatment of the blended converter slag-like process.
Detailed Description
The invention is further described below with reference to examples and figures.
Example 1
A 150t converter in a steel mill is used for desulfurizing by adopting a 150t ladle, the desulfurization slag pot 1 is preset at a baking station in a converter slag treatment field, the induction heating device 2 is used for preheating the desulfurization slag pot 1, after preheating to 300-500 ℃, the pot cover 4 is covered on the desulfurization slag pot 1 by using the cover adding and uncovering machine 3 (see figure 1), 5-10 min before the end of powder injection desulfurization of molten iron, the preheated and covered desulfurization slag pot 4 is dragged to a molten iron slag skimming station by using the ladle clamping and uncovering machine 5 for slag receiving, the pot cover 4 on the desulfurization slag pot 1 is uncovered by using the cover adding and uncovering machine 3, molten iron desulfurization slag is scraped into the desulfurization slag pot 1 from the ladle 7 by using the slag skimming head 6 after the desulfurization slag is or two-ladle molten iron slag is scraped into the desulfurization slag pot 1 (see figure 2), after the one-ladle or two-ladle molten-iron slag is covered by using the cover adding and uncovering machine 3, the ladle car cover 4 is covered on the desulfurization slag pot 1, and then the ladle clamping machine 5 is used for transporting the desulfurization slag pot 1 after the slag receiving to the converter slag treatment field mixing station 8 (see figure 3), and the metallurgical crane 9 is used for lifting the desulfurization slag pot into a mixing pit.
After the converter slag tank 10 receives slag under a converter, the converter slag tank is conveyed from a converter slag receiving station to a mixing station 8 (see fig. 4) in a converter slag treatment field by a converter slag tank truck 11, after the two tanks meet, the cover 4 of the desulfurization slag tank 1 is uncovered by a cover adding and uncovering machine 3, the converter slag tank 10 is lifted by a metallurgical crane 9, converter slag liquid is aligned to the desulfurization slag tank 1, the converter slag liquid impacts desulfurization slag (see fig. 5), a severe stirring process for fusing the two slag is formed in the desulfurization slag tank 1, and after the reaction is mild, the mixed slag in the desulfurization slag tank 1 is poured into a roller 12 for treatment (see fig. 6).
Example 2
150t converter slag is discharged from a certain steel mill, the slag discharge temperature of the converter slag is about 1600 ℃, and after the slag receiving under the converter is finished, the converter slag tank 10 is conveyed to a converter slag treatment field mixing station 8 by a converter slag tank truck 11; the desulfurization slag pot 1 is preheated in advance at a baking station and is sent to a slag skimming station, after the molten iron desulfurization slag skimming is finished, the desulfurization slag pot 1 is covered by a cover adding and uncovering machine 3, and then the desulfurization slag pot 1 is transported to a converter slag treatment field mixing station 8 by a slag holding tank car 5 in synchronization with the converter slag tank car. Placing the desulfurization slag pot 1 into a slag pit by using a metallurgical crane 9 in a converter slag treatment field mixing station 8, lifting a converter slag pot 10 from a converter slag pot 11 by using the metallurgical crane 9, conveying the converter slag pot 10 to the position above the desulfurization slag pot 1, removing a pot cover of the desulfurization slag pot 1 by using a cover adding and removing machine 3, putting a liquid converter slag pot in the converter slag pot 10 into the desulfurization slag pot 1, taking time for 5-10 min in the operation process, melting and reacting and modifying molten iron desulfurization slag by using a large amount of heat and impact force of the converter slag, and performing hot splashing treatment on the modified converter slag.
Claims (15)
1. The hot state tempering and modifying method for the molten iron desulphurization slag is characterized by comprising the following steps of:
1) Job preparation
Configuring a plurality of desulfurization slag tanks and converter slag tanks, and carrying out compatibility design or improvement on the structures of the desulfurization slag tanks, the converter slag tanks and the metallurgical cranes of the converter slag treatment field, so that the desulfurization slag tanks and the converter slag tanks can be lifted, turned over, inverted and buckled by the metallurgical cranes of the converter slag treatment field; a slag holding tank truck or a desulphurized slag tank truck is arranged between the converter slag treatment field and the molten iron slag skimming station and is used for transporting the desulphurized slag tank; setting a molten iron desulfurization slag and converter slag mixing station in a converter slag treatment field; the converter slag tank is transported by adopting a converter slag tank truck; the desulfurization slag tank adopts a desulfurization slag tank with a cover, and is additionally provided with a cover adding and uncovering machine, and the cover adding and uncovering machine is utilized to cover or uncover the desulfurization slag tank;
2) Slag receiving device
After the desulfurization of the molten iron is completed, transporting the desulfurization slag pot to a molten iron slag skimming station for slag receiving, covering the desulfurization slag pot by using a cover adding and uncovering machine after the slag receiving is completed, transporting the desulfurization slag pot to a converter slag treatment field by the slag skimming car or the desulfurization slag pot, and hoisting the desulfurization slag pot to a molten iron desulfurization slag and converter slag mixing station by using a metallurgical crane; after the slag receiving is finished, the molten iron desulfurization slag in the desulfurization slag tank accounts for 10-40% of the total volume of the desulfurization slag tank;
the converter slag pot is transported to the lower part of the converter by a converter slag pot car for receiving slag, and is transported to a converter slag treatment field by a converter slag pot car after the slag receiving of the converter slag pot is finished; after the completion of slag receiving, the converter slag in the converter slag tank accounts for 15-20% of the total volume of the converter slag tank;
3) Mixing and blending
After the converter slag tank reaches a converter slag treatment field, the converter slag tank is lifted by a metallurgical crane to be transferred to a molten iron desulfurization slag and converter slag mixing station, and a cover of the desulfurization slag tank is opened by a cover adding and removing machine, and after the converter slag tank is transferred to the upper part of the desulfurization slag tank, liquid converter slag is poured into the desulfurization slag tank, so that the molten iron desulfurization slag is subjected to thermal-state tempering modification, and similar converter slag is formed; the weight of the molten iron desulphurization slag is 30-100% of the weight of the converter slag;
4) Post-treatment
And the converter slag-like obtained after mixing is treated according to a conventional converter slag treatment process.
2. The method for thermal conditioning modification of molten iron desulphurization slag according to claim 1, wherein in the step 2), the converter slag treatment field is provided with a baking station, the desulphurization slag pot is transported to the baking station for preheating or heat supplementing before being transported to the molten iron slagging-off station, and the temperature of the desulphurization slag pot after preheating or heat supplementing is 300-500 ℃.
3. The method for thermal state tempering modification of molten iron desulphurization slag according to claim 2, wherein after preheating or heat supplementing, the desulphurization slag tank is covered by a cover adding and removing machine, and then the desulphurization slag tank is transported to a molten iron slag removing station by a tank holding truck or a molten iron desulphurization slag tank truck to wait for slag receiving, and before slag receiving, the cover is opened by the cover adding and removing machine.
4. The method for thermal conditioning modification of molten iron desulphurization slag according to claim 2, wherein the preheating or complementary heating mode is induction heating, flame baking, resistance heating or plasma heating.
5. The method for thermal conditioning modification of molten iron desulphurization slag according to claim 3, wherein the preheating or complementary heating mode is induction heating, flame baking, resistance heating or plasma heating.
6. The method for thermal state tempering modification of molten iron desulphurization slag according to any one of claims 1-5, wherein in step 3), after the liquid converter slag in the converter slag tank is poured out, the converter slag tank is hoisted back to a slag ladle by a metallurgical crane, and is transported back to the converter by the slag ladle to wait for next slag receiving for recycling.
7. The method for thermal state tempering modification of molten iron desulphurization slag according to any one of claims 1-5, wherein in step 4), the converter-like slag is lifted to a molten iron desulphurization slag and converter slag mixing station by a metallurgical crane according to a conventional converter slag treatment process, the desulphurization slag tank is capped by a capping machine, and then is lifted to a desulphurization slag tank truck by a tank truck or a metallurgical crane to be sent to a molten iron skimming station, and the next cycle is started.
8. The method for thermal state tempering modification of molten iron desulphurization slag according to any one of claims 2-5, wherein in step 4), the converter-like slag is lifted to a baking station by a metallurgical crane according to a conventional converter slag treatment process to supplement heat, the converter-like slag is capped by a capping machine after supplementing heat, and then the converter-like slag is lifted to a molten iron desulphurization slag tank truck by a tank truck or a metallurgical crane to be sent to a molten iron skimming station, and the next cycle is started.
9. The method for thermal state tempering modification of molten iron desulphurization slag according to claim 1, wherein in the step 3), after the molten iron desulphurization slag is mixed with converter slag, when the slag surface of the mixed slag is calm and the temperature is above 1400 ℃, the mixed slag in the thermal state desulphurization slag tank is poured into a rotary furnace slag tank again, namely secondary deslagging.
10. The method for thermal state tempering modification of molten iron desulphurization slag according to claim 1, wherein the distance between the molten iron desulphurization slag and the converter slag mixing station and the molten iron slag skimming station and the converter is 20-200 m.
11. The method for thermal state tempering modification of molten iron desulphurization slag according to claim 1, wherein in step 3), molten iron desulphurization slag in the desulphurization slag tank after slag receiving is completed accounts for 10-40% of the total volume of the desulphurization slag tank.
12. The method for thermal state tempering modification of molten iron desulphurization slag according to claim 1, wherein in step 3), converter slag in the converter slag tank after completion of slag receiving accounts for 15-20% of the total volume of the converter slag tank.
13. The method for thermal state tempering modification of molten iron desulphurization slag according to claim 1, wherein the desulphurization slag tank cover is made of refractory castable built in a heat-resistant steel or plain carbon steel frame.
14. The method for thermal state tempering modification of molten iron desulfurization slag according to claim 1 or 2, wherein the cover adding and uncovering machine is arranged to be movable and moves along with the desulfurization slag pot, or a cover adding and uncovering machine is arranged at each of the converter slag treatment field baking station, the molten iron desulfurization slag and converter slag mixing station and the molten iron slag skimming station.
15. The method for thermal conditioning modification of molten iron desulphurization slag according to claim 1, wherein the temperature of the molten iron desulphurization slag is 1200-1400 ℃, the temperature of converter slag is 1400-1700 ℃ and the viscosity of the converter slag is below 0.1 Pa.s during mixing in step 3).
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Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103014195A (en) * | 2012-06-14 | 2013-04-03 | 新疆八一钢铁股份有限公司 | Novel method for modification of KR desulfuration residue |
| JP2014189838A (en) * | 2013-03-27 | 2014-10-06 | Jfe Steel Corp | Desulfurization treatment method of molten steel |
| CN104531949A (en) * | 2014-12-17 | 2015-04-22 | 新疆八一钢铁股份有限公司 | Method for preventing KR stirring and desulphurizing slag tank from being adhered |
| CN104561445A (en) * | 2014-12-12 | 2015-04-29 | 新疆八一钢铁股份有限公司 | Modifying treatment method of blowing desulfurization slag |
| CN106178940A (en) * | 2016-07-29 | 2016-12-07 | 中冶宝钢技术服务有限公司 | Slag base modification desulfurizing agent for wet desulphurization and its preparation method and application |
| CN108359758A (en) * | 2018-02-27 | 2018-08-03 | 首钢京唐钢铁联合有限责任公司 | A kind of method and its application by desulfurization slag and the hot mixed processing of vessel slag |
| CN109022644A (en) * | 2018-08-03 | 2018-12-18 | 首钢集团有限公司 | A kind of method of slag desulfurization dephosphorization collaboration iron element recycling in complete three de- technique |
| CN208266070U (en) * | 2018-05-15 | 2018-12-21 | 鞍钢股份有限公司 | A kind of device preparing cement admixture using hot vessel slag |
| CN109971901A (en) * | 2019-04-19 | 2019-07-05 | 南京有荣节能科技有限公司 | A kind of application method keeping the temperature slag ladle, slag ladle and carriage and slag ladle and carriage |
| CN112080598A (en) * | 2020-08-27 | 2020-12-15 | 内蒙古科技大学 | Method and system for comprehensively utilizing slag resources of iron and steel smelting and blast furnace slag tank |
-
2021
- 2021-02-22 CN CN202110198166.9A patent/CN114959156B/en active Active
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103014195A (en) * | 2012-06-14 | 2013-04-03 | 新疆八一钢铁股份有限公司 | Novel method for modification of KR desulfuration residue |
| JP2014189838A (en) * | 2013-03-27 | 2014-10-06 | Jfe Steel Corp | Desulfurization treatment method of molten steel |
| CN104561445A (en) * | 2014-12-12 | 2015-04-29 | 新疆八一钢铁股份有限公司 | Modifying treatment method of blowing desulfurization slag |
| CN104531949A (en) * | 2014-12-17 | 2015-04-22 | 新疆八一钢铁股份有限公司 | Method for preventing KR stirring and desulphurizing slag tank from being adhered |
| CN106178940A (en) * | 2016-07-29 | 2016-12-07 | 中冶宝钢技术服务有限公司 | Slag base modification desulfurizing agent for wet desulphurization and its preparation method and application |
| CN108359758A (en) * | 2018-02-27 | 2018-08-03 | 首钢京唐钢铁联合有限责任公司 | A kind of method and its application by desulfurization slag and the hot mixed processing of vessel slag |
| CN208266070U (en) * | 2018-05-15 | 2018-12-21 | 鞍钢股份有限公司 | A kind of device preparing cement admixture using hot vessel slag |
| CN109022644A (en) * | 2018-08-03 | 2018-12-18 | 首钢集团有限公司 | A kind of method of slag desulfurization dephosphorization collaboration iron element recycling in complete three de- technique |
| CN109971901A (en) * | 2019-04-19 | 2019-07-05 | 南京有荣节能科技有限公司 | A kind of application method keeping the temperature slag ladle, slag ladle and carriage and slag ladle and carriage |
| CN112080598A (en) * | 2020-08-27 | 2020-12-15 | 内蒙古科技大学 | Method and system for comprehensively utilizing slag resources of iron and steel smelting and blast furnace slag tank |
Non-Patent Citations (1)
| Title |
|---|
| 铁水预处理KR脱硫渣特点和资源化处理工艺的开发;石枚梅;俞海明;;特殊钢(06);42-44 * |
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