CN114959156A - Method for thermal conditioning and modifying molten iron desulphurization slag - Google Patents
Method for thermal conditioning and modifying molten iron desulphurization slag Download PDFInfo
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- CN114959156A CN114959156A CN202110198166.9A CN202110198166A CN114959156A CN 114959156 A CN114959156 A CN 114959156A CN 202110198166 A CN202110198166 A CN 202110198166A CN 114959156 A CN114959156 A CN 114959156A
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- 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
- 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
A hot quenching and tempering modification method for molten iron desulphurization slag is characterized in that a metallurgical crane structure of a desulphurization slag tank, a converter slag tank and a converter slag treatment field is subjected to compatibility design or improvement, so that converter slag and molten iron desulphurization slag are mixed in the desulphurization slag tank, the hot quenching and tempering modification of the molten iron desulphurization slag is promoted, and the operation process can stably and smoothly run; in order to prevent the large-area radiation heat dissipation of the mouth of the desulfuration residue tank, the desulfuration residue tank adopts a capping design, so that the heat loss of hot molten iron desulfuration residues is greatly avoided; further, the desulfurization slag tank is heated before the desulfurization slag tank receives slag, so that quenching after molten iron desulfurization slag falls into the desulfurization slag tank is reduced, heat loss in the operation process is compensated, thermal state modification of the molten iron desulfurization slag is more sufficient, the caking difficulty of the molten iron desulfurization slag is changed, and the molten iron desulfurization slag is converted into converter slag which is easy to treat for subsequent treatment. The method can effectively avoid the formation of large lumps 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 modification treatment of desulfurized slag, in particular to a hot tempering and modification method of molten iron desulfurized slag.
Background
After the steel industry enters the era of competitive product plus cost dual constraint, steel enterprises already use molten iron pretreatment technology as a necessary process for creating competitive product steel, and molten iron desulphurization is used as the most main pretreatment process, so that the problem of treatment and disposal of molten iron desulphurization slag is brought while a converter receives satisfactory molten iron. Generally speaking, the amount of molten iron desulphurization slag accounts for about 2% of the molten iron amount, the iron slag often sticks together due to the characteristics of the desulphurization slag, and the traditional desulphurization slag treatment process is water beating and soaking, then crushing, screening and magnetic separation are carried out, so that the atmospheric pollution of a slag yard is not caused, sewage is required to be treated, the treatment cost is high, and the green reputation of a steel mill is seriously influenced.
Therefore, a new idea and method are needed for breaking the iron slag lumps and making the iron slag easy to separate. The hot-state quenching and tempering modification is carried out on the molten iron desulphurization slag, so that the molten iron desulphurization slag is converted into a well-treated resource product, and a new technical path is formed.
Chinese patent CN981005675 discloses a modifier for molten iron desulphurization slag, which comprises the following components in percentage by weight: na (Na) 2 CO 3 ：35～50％，SiO 2 ：35～50％，CaF 2 : 8-15%, is added into the molten iron after independent preparation, and needs to additionally increase the cost of raw materials and process equipment.
Chinese patent CN2014107573343 discloses a blowing desulfurization slag modification treatment method, which requires that a slag pot for receiving slag by a converter is fully filled with blowing desulfurization slag and then transported to a slag yard of the converter, the fully-filled blowing desulfurization slag is uniformly added into 2-5 empty slag pots, and then the slag pots added with the blowing desulfurization slag are placed on a slag car of the converter and transported to the lower part of the converter to be added with liquid steel slag. In the mode, the distances between the lifting lugs of the travelling crane and the widths of the lifting hooks are the same, and the travelling crane and the lifting hooks are suitable for the trunnions of the desulfuration slag ladle and the converter slag ladle, but the size difference of the two ladles is obvious in a general ferrous metallurgy enterprise, and the distances between the trunnions cannot be the same; in addition, the converter has limited slag tapping time, the logistics matching is very tight, converter slag cannot be poured into a plurality of slag tanks, so that the slag tapping time of the converter and the operation difficulty of slag tank car and converter matching slag tapping are greatly prolonged, and the converter is not feasible in practice.
Chinese patent CN2018101641542 discloses a hot-state mixing treatment method and application of desulfurized slag and converter slag, and the hot-state mixing treatment method is applied to a dry slag stewing pit. The problem that the running needs to be adapted to the KR desulfuration slag pot and the converter slag pot at the same time is also solved, and in fact, the effective obtaining rate of mixed slag iron cannot be very high, because no reaction space and container exist, liquid converter slag is only splashed on the KR desulfuration slag, the space heat dissipation is serious, the reaction area between the two slags is limited, and the reaction effect between the two slags is difficult to achieve; when the slag is fallen to the ground and the slag is turned over and mixed, a mobile machine such as a forklift is needed, but any steel machine cannot contact the 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 a slag removing machine is used for removing the modified molten iron desulphurization slag to a slag tank, the slag tank is usually a steel casting, the mouth is large, the bottom is small, and the inner wall and the outer wall of the slag tank are both free of refractory materials, so that the molten iron treatment is always a temperature reduction process, and in addition, the characteristics of the molten iron desulphurization slag cause that the desulphurization slag is basically in a thick semisolid state after being removed from the molten iron, then enters an open uncovered metal slag tank and is immediately subjected to severe cooling, and usually one slag tank is connected with a plurality of ladles of molten iron slag. Therefore, several packets of molten iron slag are removed, the inner broken layer of the slag pot can be in a laminated state of one layer, and the slag iron is often condensed into a large lump after being processed in a slag yard, so that great trouble is caused for subsequent processing.
Disclosure of Invention
The invention aims to provide a hot-state tempering and modifying method for molten iron desulphurization slag, which mixes the hot-state molten iron desulphurization slag in a slag tank into liquid converter slag for hot-state tempering, reduces the heat loss of the hot-state molten iron desulphurization slag, changes the caking and difficult-to-process characteristic of the molten iron desulphurization slag, and converts the hot-state molten iron desulphurization slag into easy-to-process converter slag for subsequent treatment.
In order to achieve the 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) preparation of work
Configuring a plurality of desulfurization slag tanks and converter slag tanks, and carrying out compatibility design or improvement on the desulfurization slag tanks, the converter slag tanks and the metallurgical crane structure of the converter slag treatment field, so that the desulfurization slag tanks and the converter slag tanks can be lifted, turned over and buckled by the metallurgical crane of the converter slag treatment field; a slag holding tank truck or a desulphurization slag tank truck is arranged between the converter slag treatment field and the molten iron slag skimming station and is used for transporting the desulphurization slag tank; arranging a molten iron desulphurization slag and converter slag mixing station in a converter slag treatment field; the converter slag tank is transported by a converter slag tank car; the desulfurization slag tank is a desulfurization slag tank with a cover, a cover adding and uncovering machine is additionally arranged, and the desulfurization slag tank is subjected to cover adding or uncovering operation by the cover adding and uncovering machine;
2) slag receiving
After molten iron desulphurization is finished, the desulphurization slag tank is transported to a molten iron slagging station by a slag holding car or a desulphurization slag tank car for slag receiving, after the slag receiving is finished, the desulphurization slag tank is covered by a cover adding and uncovering machine, then the desulphurization slag tank is transported to a slag transferring treatment field by the slag holding car or the desulphurization slag tank car, and the desulphurization slag tank is hoisted to a molten iron desulphurization slag and slag transferring mixing station by a metallurgical crane; after the slag receiving is finished, the molten iron desulphurization slag in the desulphurization slag tank accounts for 10-40% of the total volume of the desulphurization slag tank;
the converter slag tank is transported to the lower part of the converter by a converter slag tank truck to wait for slag receiving, and the converter slag tank is transported to a converter slag treatment field by the converter slag tank truck after the slag receiving of the converter slag tank is finished; after the slag receiving is finished, converter slag in the converter slag tank accounts for 15-20% of the total volume of the converter slag tank;
3) mixing and concocting
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 desulphurization slag and converter slag mixing station, a cover of the desulphurization slag tank is opened by a cover adding and uncovering machine, the converter slag tank is transferred to the upper part of the desulphurization slag tank, and then the liquid converter slag is poured into the desulphurization slag tank to realize thermal state tempering and modification of the molten iron desulphurization slag to form converter slag; the weight of the molten iron desulphurization slag is 30-100% of that of the converter slag;
4) post-treatment
And treating the converter slag obtained after mixing according to a conventional converter slag treatment process.
Further, in the step 2), a baking station is arranged in the converter slag treatment field, the desulfurization slag tank is preheated and subjected to turnover cooling and heat compensation before being put into use, the desulfurization slag tank is conveyed to the baking station to be preheated or subjected to heat compensation before being conveyed to the molten iron slagging-off station, and the temperature of the desulfurization slag tank after being preheated or subjected to heat compensation is 300-500 ℃.
Further, after the desulfurization slag tank is preheated or supplemented with heat, the desulfurization slag tank is covered by a covering and uncovering machine, then the desulfurization slag tank is conveyed to a molten iron slag removing station by a slag holding vehicle or a molten iron desulfurization slag tank vehicle to wait for slag receiving, and before the slag receiving, the covering and uncovering machine is used for opening the covering.
Preferably, the preheating or heat supplementing 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 by a metallurgical crane to be placed back to the slag tank car, and the slag tank car is transported back to the converter for next slag receiving and recycling.
Preferably, in the step 4), the converter slag is hoisted 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 covered by a cover removing machine, and then is hoisted to a desulphurization slag tank car by a tank holding car or a metallurgical crane and is sent to a molten iron slagging station, and the next round of circulation is started.
Preferably, in the step 4), the converter slag is hoisted to a baking station by a metallurgical crane according to a conventional converter slag treatment process, the desulfurized slag tank after the converter slag is emptied is subjected to heat compensation, the desulfurized slag tank is covered by a covering and uncovering machine after the heat compensation, and then the desulfurized slag tank is hoisted to a molten iron desulfurized slag tank car by a tank car or the metallurgical crane and is conveyed to a molten iron slag skimming station, and the next round of circulation is started.
Preferably, in the step 3), after the molten iron desulphurization slag and the converter slag are mixed, when the surface of the mixed slag is calm and the temperature is above 1400 ℃, the mixed slag in the thermal desulphurization slag tank is poured back into the converter slag tank again, namely secondary slag pouring.
Preferably, the distance between the molten iron desulphurization slag mixing station and the converter slag mixing station and the distance between the molten iron slagging station and the converter are both 20-200 m.
Preferably, in the step 3), the molten iron desulphurization slag in the desulphurization slag tank accounts for 10-40% of the total volume of the desulphurization slag tank after the slag receiving is finished.
Preferably, in the step 3, the converter slag in the converter slag pot accounts for 15-20% of the total volume of the converter slag pot after the slag is completely received.
Preferably, the desulfuration residue tank cover is made of refractory steel or common carbon steel frame interior masonry refractory casting material.
Preferably, the covering and uncovering machine is arranged to be movable and moves along with the desulphurization slag tank, or the converter slag treatment field baking station, the molten iron desulphurization slag and converter slag mixing station and the molten iron slagging station are respectively provided with the covering and uncovering machine.
Preferably, during mixing 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 0.1Pa · s.
The related structures of the desulphurization slag pot, the converter slag pot and the metallurgical crane of the converter slag treatment field are compatibly designed or improved, so that the desulphurization 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 a molten iron desulphurization slag and converter slag mixing station is arranged in a converter slag treatment field and is used for carrying out thermal conditioning modification on the molten iron desulphurization slag. A slag holding tank car or a desulphurization slag tank car is arranged between the converter slag treatment field and the molten iron slagging station and is used for placing and removing the empty tank or the heavy tank desulphurization slag tank on the appointed station and transporting the empty tank or the heavy tank desulphurization slag tank between the relevant stations, so that the transportation of the desulphurization slag tank between the converter slag treatment field and the molten iron slagging station is facilitated.
Storing a plurality of desulfurization slag pots and converter slag pots in a converter slag treatment field; after molten iron desulphurization is finished, the desulphurization slag tank is transported to a molten iron slagging station by a tank carrying truck or a desulphurization slag tank truck to wait for slag receiving, and after a specified slag amount is received by the desulphurization slag tank, the desulphurization slag tank is covered by a covering and uncovering machine, so that large-area radiation heat dissipation of thermal desulphurization slag is prevented, and heat loss of the thermal desulphurization slag is avoided as much as possible. The slag holding car or the molten iron desulphurization slag car carries the desulphurization slag tank with the cover to a converter slag treatment field, and then the desulphurization slag tank with the cover is hoisted to a molten iron desulphurization slag and converter slag mixing station by a metallurgical crane to wait for mixing with the converter slag.
The converter slag pot is transported to the converter from the converter slag pot car for waiting slag discharge, and the converter slag pot is transported to the converter slag treatment field from the converter slag pot car after the converter slag discharge is finished. The converter slag pot is sent to a converter slag treatment field, and a metallurgical crane lifts the converter slag pot above the desulfurization slag pot; when the converter slag pot moves to the mixing station, a cover removing machine is added to remove the pot cover on the desulfurization slag pot; after the converter slag tank is moved above the desulfurization slag tank, the metallurgical crane adjusts the relative position, distance and angle between the two tanks, and after the converter slag tank is properly tilted, liquid converter slag in the converter slag tank is poured into the desulfurization slag tank below, and two kinds of thermal-state slag in the desulfurization slag tank are subjected to mixing reaction.
After the mixed slag in the desulphurization slag tank reacts for a period of time, the molten iron desulphurization slag is converted into converter-like slag, the bonding state of slag and iron is eliminated, the mixed slag is in a sintering loose state, steel and slag are easy to separate, and then the mixed slag in the desulphurization slag tank is subsequently treated according to the conventional converter slag treatment procedure; and (3) performing subsequent slag-like treatment of the converter by adopting hot splashing, a roller and hot stuffiness to gradually realize slag-iron separation, returning the obtained iron component to production and use, and selling 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 ℃, the formed mixed slag still has enough heat and can be poured, and then the mixed slag in the desulphurization slag tank can be optionally poured back into the converter slag tank, namely secondary deslagging, and through the secondary deslagging, the process of primary contact stirring and mixing of reaction media in the molten iron desulphurization slag and the converter slag can be further increased, so that the complete modification is further promoted.
In order to further keep the hot state of the molten iron desulphurization slag during mixing, a baking station is arranged in a converter slag treatment field, a desulphurization slag tank is preheated or supplemented with heat by adopting heating modes such as induction heating, flame baking, resistance heating or plasma heating, the temperature of the preheated or supplemented desulphurization slag tank is 300-500 ℃, the warm state of the desulphurization slag tank is maintained, the rapid cooling of the molten iron desulphurization slag after falling into the desulphurization slag tank is reduced, the heat loss in the operation process is compensated, the hot state of the desulphurization slag tank is always kept, guarantee and support are provided for pouring the mixed slag in the desulphurization slag tank into the converter slag tank for secondary mixing, and the hot state modification of the molten iron desulphurization slag is more sufficient.
If the emptied desulfurized slag tank needs to be baked or supplemented with heat, the empty desulfurized slag tank is returned to a baking station by a metallurgical crane, the empty desulfurized slag tank is covered by a covering and uncovering machine after being baked, and the hot empty desulfurized slag tank with the cover is lifted to a desulfurized slag tank car by the metallurgical crane to be returned to a molten iron slagging station or directly returned to the molten iron slagging station by a tank holding car; if baking or heat supplementing is not needed, the capping machine can cap the desulfurization slag tank, and the capped desulfurization slag tank is directly returned to the molten iron slagging station by the slag transport vehicle or lifted to the desulfurization slag tank vehicle by the metallurgical crane and then returned to the molten iron slagging station by the vehicle; and after the ladle is desulfurized and the empty molten iron desulphurization slag tank with the cover is ready to receive slag, taking down the cover of the desulphurization slag tank by the cover removing machine, starting to receive slag, and starting a second cycle. The emptied converter slag pot is hoisted to a converter slag pot car by a metallurgical crane and then 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 desulfurization slag tank; or fixed, and one set is arranged at each station needing to be covered and uncovered.
The oil pipe of the tank carrying vehicle 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 the relative mechanisms of the desulphurization slag pot, the converter slag pot, a metallurgical crane of a converter slag treatment field and the like, so that the desulphurization 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 that the shape difference between the traditional desulphurization slag pot and the converter slag pot is large, the mixing operation is inconvenient, and the modification of the molten iron desulphurization slag and the converter slag under the thermal state can not be realized.
In order to further realize thermal state quenching and tempering modification of the molten iron desulphurization slag and the converter slag, the desulphurization slag tank is designed to be covered in the treatment process, so that large-area radiation heat dissipation of the thermal state molten iron desulphurization slag is prevented, and heat loss of the thermal state molten iron desulphurization slag is avoided as much as possible; furthermore, preheating and transferring cooling are carried out before the desulfurization slag tank is put into use, so that quenching after molten iron desulfurization slag falls into the desulfurization slag tank is reduced, heat loss in the operation process of the desulfurization slag tank is compensated, the thermal state of the desulfurization slag tank is always kept, and the thermal state modification of the molten iron desulfurization slag is more sufficient.
The method for thermally modifying the molten iron desulphurization slag avoids the formation of large lumps of the desulphurization slag iron, the molten iron desulphurization slag can be converted into converter-like slag, and the subsequent treatment can be carried out by adopting a traditional converter slag treatment method, so that the resource utilization value of the desulphurization slag is improved.
Drawings
FIG. 1 is a schematic structural diagram of a desulfurization slag pot baking and cover-uncovering operation process device.
FIG. 2 is a schematic structural diagram of a device for receiving slag from a desulphurized slag tank at a molten iron slagging-off station.
Fig. 3 is a schematic diagram of the desulfurized slag tank being transported between the molten iron slagging station and the converter slag treatment site by a slag holding vehicle.
Fig. 4 is a schematic view of the transport of the converter slag pot between the converter and the converter slag processing yard by the converter slag pot car.
FIG. 5 is a schematic structural view of an apparatus for mixing molten iron desulfurization slag and converter slag at a mixing station.
FIG. 6 is a schematic view showing the structure of a mixed converter slag post-treatment process.
Detailed Description
The invention is further illustrated by the following examples and figures.
Example 1
A150 t converter of a steel plant is desulfurized by adopting a 150t ladle, a desulfurized slag tank 1 is preset at a baking station of a converter slag treatment field, the desulfurized slag tank 1 is preheated by an induction heating device 2 to 300-500 ℃, a cover 4 is covered on the desulfurized slag tank 1 by a cover adding and uncovering machine 3 (see figure 1), 5-10 min before the molten iron is sprayed and desulfurized, the preheated and covered desulfurized slag tank 4 is dragged to a molten iron slag removing station by a slag holding car 5 to be connected with slag, the cover 4 on the desulfurized slag tank 1 is uncovered by the cover adding and uncovering machine 3, the molten iron desulfurized slag is taken into the desulfurized slag tank 1 from the ladle 7 by a slag removing head 6 after the molten iron is desulfurized (see figure 2), one or two ladles of molten iron are taken off the slag, the cover 4 is covered on the desulfurized slag tank 1 by the cover adding and uncovering machine 3, and the desulfurized slag tank 1 covered with slag after the slag is transported to a converter slag mixing station 8 (see figure 3) of the converter slag receiving and covering station 5, and hoisting the desulfurization slag tank into a slag pit of the mixing station by a metallurgical crane 9.
After the converter slag tank 10 is subjected to slag receiving in the converter, the slag is conveyed to a mixing station 8 (see fig. 4) in a converter slag treatment plant from a converter slag receiving station by a converter slag tank truck 11, after the two tanks are converged, a cover 4 of a desulfurization slag tank 1 is removed by a cover adding and removing 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 violent stirring process of two-slag fusion 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 of converter slag is discharged from a certain steel plant, the slag discharging temperature of the converter slag is about 1600 ℃, and the converter slag pot 10 is conveyed to a mixing station 8 of a converter slag treatment field by a converter slag pot car 11 after the slag discharging of the converter is finished; the desulfurization slag tank 1 is preheated in advance at a baking station and is conveyed to a slagging station, after the molten iron desulfurization slag slagging is finished, the desulfurization slag tank 1 is capped by a capping and uncovering machine 3, and then the desulfurization slag tank 1 is conveyed to a converter slag treatment field mixing station 8 by a tank holding vehicle 5 in synchronization with a converter slag tank vehicle. The method comprises the steps of placing a desulfurization slag tank 1 into a slag pit by using a metallurgical crane 9 in a mixing station 8 of a converter slag treatment field, hoisting a converter slag tank 10 from a converter slag tank truck 11 by using the metallurgical crane 9, conveying the converter slag tank to the position above the desulfurization slag tank 1, then removing a tank cover of the desulfurization slag tank 1 by using a cover adding and removing machine 3, putting a liquid converter slag tank in the converter slag tank 10 into the desulfurization slag tank 1, wherein the operation process takes 5-10 min, the molten iron desulfurization slag is melted and reacted for modification by using a large amount of heat and impact force of the converter slag, and the modified converter slag is subjected to hot splashing treatment.
Claims (14)
1. A hot quenching and tempering modification method for molten iron desulphurization slag is characterized by comprising the following steps:
1) preparation of work
Configuring a plurality of desulfurization slag tanks and converter slag tanks, and carrying out compatibility design or improvement on the desulfurization slag tanks, the converter slag tanks and the metallurgical crane structure of the converter slag treatment field, so that the desulfurization slag tanks and the converter slag tanks can be lifted, turned over and buckled by the metallurgical crane of the converter slag treatment field; a slag holding tank truck or a desulphurization slag tank truck is arranged between the converter slag treatment field and the molten iron slag skimming station and is used for transporting the desulphurization slag tank; arranging a molten iron desulphurization slag and converter slag mixing station in a converter slag treatment field; the converter slag tank is transported by a converter slag tank car; the desulfurization slag pot adopts a desulfurization slag pot with a cover, a covering and uncovering machine is additionally arranged, and the desulfurization slag pot is covered or uncovered by the covering and uncovering machine;
2) slag receiving
After molten iron desulphurization is finished, the desulphurization slag tank is transported to a molten iron slagging station by a slag holding car or a desulphurization slag tank car for slag receiving, after the slag receiving is finished, the desulphurization slag tank is covered by a cover adding and uncovering machine, then the desulphurization slag tank is transported to a slag transferring treatment field by the slag holding car or the desulphurization slag tank car, and the desulphurization slag tank is hoisted to a molten iron desulphurization slag and slag transferring mixing station by a metallurgical crane; after the slag receiving is finished, the molten iron desulphurization slag in the desulphurization slag tank accounts for 10-40% of the total volume of the desulphurization slag tank;
the converter slag tank is transported to the lower part of the converter by a converter slag tank truck to wait for slag receiving, and the converter slag tank is transported to a converter slag treatment field by the converter slag tank truck after the slag receiving of the converter slag tank is finished; after the slag receiving is finished, converter slag in the converter slag tank accounts for 15-20% of the total volume of the converter slag tank;
3) mixing and concocting
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 desulphurization slag and converter slag mixing station, a cover of the desulphurization slag tank is opened by a cover adding and uncovering machine, the converter slag tank is transferred to the upper part of the desulphurization slag tank, and then the liquid converter slag is poured into the desulphurization slag tank to realize thermal state tempering and modification of the molten iron desulphurization slag to form converter slag; the weight of the molten iron desulphurization slag is 30-100% of that of the converter slag;
4) post-treatment
And treating the converter slag obtained after mixing according to a conventional converter slag treatment process.
2. The method for thermal conditioning and modifying of the molten iron desulphurization slag according to claim 1, wherein in the step 2), the converter slag treatment site is provided with a baking station, the desulphurization slag tank is transported to the baking station for preheating or supplementing heat before being transported to the molten iron slagging station, and the temperature of the desulphurization slag tank after preheating or supplementing heat is 300-500 ℃.
3. The method for thermal conditioning and modifying of molten iron desulphurization slag according to claim 2, wherein the desulphurization slag tank is preheated or supplemented with heat, and then is capped by a capping machine, and then is transported to a molten iron slagging station by a slag holding car or a molten iron desulphurization slag tank car to wait for slag receiving, and before slag receiving, the capping machine is used to open the cap.
4. The method for thermal refining and modifying of molten iron desulphurization slag according to claim 2 or 3, wherein the preheating or concurrent heating is induction heating, flame baking, resistance heating or plasma heating.
5. The method for thermal conditioning and modifying of the molten iron desulphurization slag according to any one of claims 1 to 4, wherein in the step 3), after the liquid converter slag in the converter slag tank is poured out, the converter slag tank is hoisted by a metallurgical crane and returned to a slag tanker, and the slag tanker is transported to the converter by the converter for next slag receiving and recycling.
6. The method for thermal conditioning and modifying of the molten iron desulphurization slag according to any one of claims 1 to 5, wherein in the step 4), the converter slag is treated by a conventional converter slag treatment process, the desulphurization slag tank with the converter slag emptied is hoisted to a molten iron desulphurization slag and converter slag mixing station by a metallurgical crane, a cover removing machine is added to cover the desulphurization slag tank, and then the desulphurization slag tank is hoisted to a desulphurization slag tank car by a tank holding car or the metallurgical crane and is sent to a molten iron slagging station, and the next cycle is started.
7. The method for thermal conditioning and modifying of the molten iron desulphurization slag according to any one of claims 2 to 5, wherein in the step 4), the converter slag is processed according to a conventional converter slag processing technology, the desulphurization slag tank with the converter slag emptied is hoisted to a baking station by a metallurgical crane for heat compensation, after the heat compensation, the desulphurization slag tank is capped by a capping machine, and then the desulphurization slag tank is hoisted to a molten iron desulphurization slag tank car by a slag holding car or the metallurgical crane and is sent to a molten iron slagging station, and the next cycle is started.
8. The method for thermal refining and modification of molten iron desulphurization slag according to claim 1, wherein in the step 3), after the molten iron desulphurization slag and the converter slag are mixed, when the mixed slag surface is calm and the temperature is above 1400 ℃, the mixed slag in the thermal desulphurization slag tank is poured back into the converter slag tank again, namely secondary deslagging is carried out.
9. The method for thermal conditioning and modifying of the molten iron desulphurization slag according to claim 1, wherein the distance between the molten iron desulphurization slag mixing station and the converter slag mixing station and the distance between the molten iron slagging station and the converter are both 20-200 m.
10. The method for thermal conditioning and modifying of the molten iron desulphurization slag according to claim 1, wherein in the step 3), the molten iron desulphurization slag in the desulphurization slag tank accounts for 10-40% of the total volume of the desulphurization slag tank after the slag receiving is finished.
11. The method for thermal conditioning and modifying of the molten iron desulphurization slag according to claim 1, wherein in step 3), the converter slag in the converter slag pot accounts for 15-20% of the total volume of the converter slag pot after the slag receiving is finished.
12. The method for thermal conditioning and modifying of the molten iron desulphurization slag according to claim 1, wherein the desulphurization slag pot cover is made of refractory casting material built inside a frame made of heat-resistant steel or common carbon steel.
13. The method for thermal conditioning and modifying of molten iron desulphurization slag according to claim 1 or 2, wherein the capping machine is movably arranged and moves along with the desulphurization slag tank, or the converter slag treating field baking station, the molten iron desulphurization slag and converter slag mixing station and the molten iron slagging station are respectively provided with a capping machine.
14. The method for thermal conditioning and modifying of the molten iron desulphurization slag according to claim 1, wherein during the mixing 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.
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