CN113736952A - Steel-making warming agent and preparation method thereof - Google Patents
Steel-making warming agent and preparation method thereof Download PDFInfo
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- CN113736952A CN113736952A CN202111010063.1A CN202111010063A CN113736952A CN 113736952 A CN113736952 A CN 113736952A CN 202111010063 A CN202111010063 A CN 202111010063A CN 113736952 A CN113736952 A CN 113736952A
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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
- C21C7/005—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00 using exothermic reaction compositions
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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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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Abstract
The invention relates to the technical field of steel smelting, and particularly discloses a steelmaking warming agent and a preparation method thereof, wherein the steelmaking warming agent comprises, by weight, 70-85 parts of raw material CDQ powder, 5-10 parts of framework material, 5-10 parts of binder and 5-15 parts of water. In the invention, the CDQ powder is dust generated in a coke dry quenching process, belongs to solid waste, the forming capability and firmness of the temperature increasing agent are increased by collecting the waste and combining with the framework material, the temperature increasing agent can partially or completely replace medium coke and outsourcing temperature increasing agents, the production can be met, the price is low, the steel-making cost is favorably reduced, and the dosage of the temperature increasing agent can be controlled according to the specific proportion of each material in the temperature increasing agent.
Description
Technical Field
The invention relates to the technical field of steel smelting, in particular to a steelmaking warming agent and a preparation method thereof.
Background
The steel is a general term for iron-carbon alloys with a carbon content between 0.02% and 2.11% by mass. The chemical composition of the steel can vary greatly, and steels containing only carbon elements are called carbon steels (carbon steels) or ordinary steels; in actual production, steel often contains different alloying elements according to different applications, such as: manganese, nickel, vanadium, and the like. The history of steel application and research by mankind has been long, but until the 19 th century bainitic process was invented, steel production was a costly and inefficient task. Nowadays, steel is one of the most used materials in the world due to its inexpensive, reliable properties, and is an indispensable component in the construction industry, manufacturing industry, and people's daily life. It can be said that steel is the material basis of modern society.
Molten iron is commonly known as liquid iron, and is a pure substance of simple substance iron, and the melting point of the liquid iron is 1535 ℃, so that the liquid iron is a substance which can quickly absorb heat and slowly dissipate heat.
Molten iron needs to be transferred in the smelting process, and the temperature of the molten iron in the transferring process can be gradually reduced, so that the processing requirement cannot be met, and therefore, a temperature increasing agent needs to be added into the molten iron with the reduced temperature for increasing the temperature of the molten iron. At present, generally, the coke in the self-production is taken as the main material, the consumption is huge, the coke is insufficient, the ferro-coke balance in the production process is seriously influenced, and if the molten steel temperature increasing agent is directly purchased externally, the purchasing cost is high, the steelmaking cost is influenced, and the quality control of the temperature increasing agent is not facilitated.
Disclosure of Invention
The invention aims to provide a steelmaking temperature increasing agent and a preparation method thereof, and aims to solve the problems that in the prior art, coke is insufficient, the cost of purchased temperature increasing agent is high, the iron-coke balance and the steelmaking cost are influenced, and the quality control of the temperature increasing agent is not facilitated.
In order to achieve the purpose, the invention adopts the following technical scheme:
on one hand, the invention provides a temperature increasing agent for steelmaking, which comprises the following raw materials in parts by weight:
70-85 parts of CDQ powder;
5-10 parts of framework material;
5-10 parts of a binder;
5-15 parts of water.
As a preferable scheme of the temperature raising agent for steelmaking, the temperature raising agent comprises the following raw materials in parts by weight:
75-80 parts of CDQ powder;
6-8 parts of a framework material;
6-8 parts of a binder;
8-14 parts of water.
As a preferable scheme of the temperature increasing agent for steelmaking, the skeleton material comprises iron balls, and the iron balls are obtained by screening waste materials.
As a preferable scheme of the temperature increasing agent for steelmaking, the outer diameter of the iron ball is less than 5 mm.
As a preferable scheme of the temperature raising agent for steelmaking, the binder is any one or more of water glass, cement, syrup, starch or polyvinyl alcohol.
On the other hand, the invention provides a preparation method of the temperature increasing agent for steelmaking, which comprises the following steps:
s01, sequentially mixing 70-85 parts by weight of CDQ powder, 5-10 parts by weight of skeleton material, 5-10 parts by weight of binder and 5-15 parts by weight of water to obtain a mixture;
s02, storing the mixture in a digestion bin for digestion, and then conveying the mixture to an intermediate bin;
s03, feeding the mixture into a double-roller ball press machine through an ash discharge valve below the middle bin, and extruding the mixture into balls under high pressure to obtain wet balls;
and S04, conveying the wet balls to a finished product bin through conveying equipment, and airing in the finished product bin to obtain finished product balls.
As a preferable embodiment of the method for preparing the steelmaking heating agent, the materials are premixed by a forklift before step S01.
As a preferable scheme of the preparation method of the warming agent for steelmaking, in step S04, the natural airing time is 3-4 days.
As a preferred scheme of the preparation method of the temperature increasing agent for steelmaking, in step S04, waste gas generated in the production process of the rotary hearth furnace is introduced to dry and solidify finished balls.
As a preferable scheme of the preparation method of the warming agent for steelmaking, in step S04, the drying time is not less than 4 hours.
The invention has the beneficial effects that:
the invention provides a steelmaking warming agent, which comprises 70-85 parts by weight of CDQ powder, 5-10 parts by weight of a framework material, 5-10 parts by weight of a binder and 5-15 parts by weight of water. The CDQ powder is dust generated in a coke dry quenching process, belongs to solid waste, is collected and combined with a framework material to increase the forming capability and firmness of the temperature increasing agent, the temperature increasing agent can partially or completely replace medium coke and outsourcing temperature increasing agents, can meet the requirement of production, is low in price, is beneficial to reducing the steelmaking cost, and can control the dosage of the temperature increasing agent according to the specific proportion of each material in the temperature increasing agent.
Drawings
FIG. 1 is a flow chart of a method for preparing a steelmaking warming agent according to an embodiment of the present invention.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Where the terms "first position" and "second position" are two different positions, and where a first feature is "over", "above" and "on" a second feature, it is intended that the first feature is directly over and obliquely above the second feature, or simply means that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
Example one
The embodiment provides a steelmaking heating agent which comprises the following raw materials in parts by weight, wherein the raw materials comprise, by weight, 70-85 parts of CDQ powder, 5-10 parts of framework materials, 5-10 parts of binders and 5-15 parts of water.
In this embodiment, CDQ (coke dry quenching, which is a quenching method for cooling red coke by using an inert gas) powder is dust generated in a coke dry quenching process, and belongs to solid waste, the forming ability and firmness of a temperature increasing agent are increased by collecting the waste and combining with a framework material, the temperature increasing agent can partially or completely replace medium coke and outsourcing temperature increasing agents, the production can be satisfied, the price is low, the steel making cost can be reduced, and the dosage of the temperature increasing agent can be controlled according to the specific proportion of each material in the temperature increasing agent.
In the embodiment, the temperature raising agent preferably comprises 75 to 80 parts by weight of the raw material CDQ powder; 6-8 parts of a framework material; 6-8 parts of a binder; 8-14 parts of water. In other embodiments, preferably, the CDQ powder is 71.9 parts by weight, the matrix material is 8.1 parts by weight, the binder is 6 parts by weight, and the water is 14 parts by weight; namely CDQ powder, aggregate, binder and water, in amounts of 71.9%, 8.1%, 6% and 14% by weight, respectively. The heating agent prepared by the scheme has the advantages of best quality, high yield and fixed carbon content of about 65 percent, and can meet the production requirement of steel making. The warming agent has the main effects that:
1. under the conditions of the same molten iron temperature and the same scrap steel adding amount, 1 ton of temperature increasing agent and 1 ton of medium coke are respectively added, the temperature increasing effects of the temperature increasing agent and the medium coke are basically equivalent, but the oxygen blowing time for steelmaking can be shortened by about 29 seconds, the steelmaking production rhythm is greatly improved, and the steelmaking capacity is favorably improved.
2. By adopting the temperature increasing agent in the embodiment, the iron-coke balance of the iron-making plant can be effectively relieved.
In the iron and steel plant, can produce the scrap iron of a large amount of different shapes in the production process of each link, for improving the scrap iron utilization ratio, in this embodiment, as preferred, the skeleton material includes the iron ball, and the iron ball is obtained through screening the waste material. By means of the arrangement, the waste iron produced in the steel plant can be effectively utilized again, the waste iron is prevented from being directly sold out of the factory at low price, the utilization value of the cooled and formed waste iron is improved, and the purpose that the waste iron is not sold out of the factory in the steel plant can be promoted.
The warming agent is required to be prepared into a solid sphere of an appropriate volume according to the demand, and when the volume of the warming agent is excessively large, there is a possibility that combustion is insufficient. For this reason, in the present embodiment, it is preferable that the outer diameter of the iron ball is less than 5 mm. With the above arrangement, the temperature increasing agent can be maintained at a certain size, so that the temperature increasing agent can be sufficiently burned.
In order to ensure that the CDQ powder can be firmly adhered to the framework material in the preparation process of the temperature increasing agent, a binder needs to be added, and in the embodiment, the binder is any one or more of water glass, cement, syrup, starch or polyvinyl alcohol. Preferably starch and syrup, wherein the ratio of starch to syrup is 4% and 2% by weight. The syrup concentration was 80 g/ml.
Example two
As shown in fig. 1, this embodiment further provides a preparation method of a steelmaking warming agent, which is used for preparing the steelmaking warming agent in the above scheme, and includes the following steps:
s01, mixing 70-85 parts by weight of CDQ powder, 5-10 parts by weight of skeleton material, 5-10 parts by weight of binder and 5-15 parts by weight of water in sequence to obtain a mixture. Optionally, the material is mixed in a blender or a mixing mill.
And S02, storing the mixture in a digestion bin for digestion, and conveying the mixture to an intermediate bin after full digestion. The digestion time of the mixture in the digestion bin is not less than 16 hours.
And S03, feeding the mixture into a double-roller ball press machine through an ash discharge valve below the middle bin, and extruding the mixture into balls under high pressure to obtain wet balls.
And S04, conveying the wet balls to a finished product bin through conveying equipment, and airing in the finished product bin to obtain finished balls, wherein the finished balls are the warming agent.
Because the content of each material in the temperature increasing agent in the prior art is generally unspecific due to the consideration of commercial confidentiality, the content of each purchased temperature increasing agent cannot be known, and the influence of the temperature increasing agent on molten iron after use cannot be determined.
In the embodiment, the materials are mixed and digested to prepare the wet balls, the wet balls are dried to obtain the finished balls, the dust generated in the coke dry quenching process can be effectively utilized, the production can be met, the price is low, the steel-making cost can be reduced, and the using amount of the temperature-increasing agent can be controlled according to the specific proportion of the materials in the temperature-increasing agent.
Preferably, the materials are pre-mixed by a forklift, in particular, the various materials are pre-mixed on the ground by the forklift, before step S01. With the help of the arrangement, the material mixing efficiency can be improved to a certain extent.
Form the mixture that has viscosity after using the forklift to mix various materials, can glue on the scraper bowl of forklift, the clearance degree of difficulty is great, has influenced the use in forklift later stage. To this end, in other embodiments, preferably, no water is added when the premixing is performed by a forklift. On one hand, the water is not added, so that the forklift can be conveniently used for mixing; on the other hand, the forklift which participates in premixing is convenient to clean. The premix is then mixed in a blender or mixer mill, at which time water is added.
In this embodiment, the time from the wet ball to the finished ball is optimized, and in step S04, the natural airing time is 3 to 4 days. Of course, there may be a shortening or lengthening, for example, 1 to 2 days, or 5 to 8 days, in consideration of the influence of the temperature and humidity. In order to avoid the influence of the air temperature or the air humidity on the drying speed, in this embodiment, preferably, in step S04, in the drying process of the wet balls, the waste gas generated in the production process of the rotary hearth furnace is introduced to dry and cure the finished balls. Because the temperature of the waste gas can reach 300 ℃, the drying speed of the wet balls can be greatly improved. Thereby shortening the preparation time of the temperature increasing agent and enabling the waste gas generated in the production process of the rotary hearth furnace to be reused.
Wherein the drying time is not less than 4 hours. The drying time is optimized by the arrangement, and the wet bulb drying effect is improved.
In addition, when higher exhaust gas temperature gets into in the finished product storehouse, can make the moisture of wet bulb evaporate rapidly, lead to wet bulb drying process to appear crackle.
Therefore, in the embodiment, the temperature of the waste gas is also reduced, and the temperature of the waste gas entering the finished product bin is controlled. Specifically, the waste gas enters a cold water pool before entering a finished product bin through a waste gas pipeline, and the waste gas in the waste gas pipeline is cooled. Further, the waste gas pipeline is arranged in the cold water pool in a serpentine shape to reduce the area of the cold water pool. Further, the waste gas pipe is arranged in multiple layers in the cold water tank to reduce the height of the cold water tank. And furthermore, the waste gas pipeline is provided with a plurality of cooling fins at intervals along the waste gas circulation direction, one end of each cooling fin extends into the waste gas pipeline, and the other end of each cooling fin is positioned in the cold water pool. Wherein the cooling fin is inserted into the exhaust gas pipe and welded to the exhaust gas pipe. Of course, in other embodiments, the cooling fins may be bolted to the exhaust gas conduit. The cooling piece comprises a connecting part, a nut is welded on the exhaust gas pipeline, and a screw penetrates through a mounting hole of the connecting part to be in threaded fit with the nut on the exhaust gas pipeline. This setting can clear up the cooling fin, avoids the solid waste adhesion in the waste gas to lead to the waste gas pipeline to block up at the cooling fin.
It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (10)
1. The temperature raising agent for steelmaking is characterized by comprising the following raw materials in parts by weight:
70-85 parts of CDQ powder;
5-10 parts of framework material;
5-10 parts of a binder;
5-15 parts of water.
2. The steelmaking heating agent as claimed in claim 1, which comprises the following raw materials in parts by weight:
75-80 parts of CDQ powder;
6-8 parts of a framework material;
6-8 parts of a binder;
8-14 parts of water.
3. The steelmaking flux as claimed in claim 1, wherein the skeletal material includes iron balls obtained by screening scrap.
4. A temperature increasing agent for steel making according to claim 3, wherein the outer diameter of the iron ball is less than 5 mm.
5. A temperature increasing agent for steelmaking as claimed in any one of claims 1 to 4 in which the binder is any one or more of water glass, cement, syrup, starch or polyvinyl alcohol.
6. A preparation method of a temperature increasing agent for steelmaking is characterized by comprising the following steps:
s01, sequentially mixing 70-85 parts by weight of CDQ powder, 5-10 parts by weight of skeleton material, 5-10 parts by weight of binder and 5-15 parts by weight of water to obtain a mixture;
s02, storing the mixture in a digestion bin for digestion, and then conveying the mixture to an intermediate bin;
s03, feeding the mixture into a double-roller ball press machine through an ash discharge valve below the middle bin, and extruding the mixture into balls under high pressure to obtain wet balls;
and S04, conveying the wet balls to a finished product bin through conveying equipment, and airing in the finished product bin to obtain finished product balls.
7. The method for preparing a steelmaking warming agent as claimed in claim 6, wherein the materials are premixed by a forklift before step S01.
8. The method for preparing a steelmaking heating agent as claimed in claim 6, wherein the natural airing time in step S04 is 3 to 4 days.
9. The method of claim 6, wherein in step S04, waste gas generated in the rotary hearth furnace production process is introduced to dry and solidify the finished balls.
10. The method for preparing a steelmaking heating agent as claimed in claim 9, wherein the baking time in step S04 is not less than 4 hours.
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| CN202111010063.1A CN113736952A (en) | 2021-08-31 | 2021-08-31 | Steel-making warming agent and preparation method thereof |
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Application publication date: 20211203 |