CN111139333A - Steelmaking method for recycling steelmaking wastes - Google Patents
Steelmaking method for recycling steelmaking wastes Download PDFInfo
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- CN111139333A CN111139333A CN202010033139.1A CN202010033139A CN111139333A CN 111139333 A CN111139333 A CN 111139333A CN 202010033139 A CN202010033139 A CN 202010033139A CN 111139333 A CN111139333 A CN 111139333A
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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
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/52—Manufacture of steel in electric furnaces
- C21C5/527—Charging of the electric furnace
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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
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
- C21C5/30—Regulating or controlling the blowing
- C21C5/32—Blowing from above
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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
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/56—Manufacture of steel by other methods
- C21C5/562—Manufacture of steel by other methods starting from scrap
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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
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/56—Manufacture of steel by other methods
- C21C5/562—Manufacture of steel by other methods starting from scrap
- C21C5/565—Preheating of scrap
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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
- C21C2200/00—Recycling of waste material
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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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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
- Manufacture And Refinement Of Metals (AREA)
Abstract
The invention discloses a steelmaking method for recycling steelmaking wastes, belonging to the technical field of steelmaking waste recycling, and comprising the following steps: s1: pretreating scrap steel; s2: electric arc furnace steelmaking; s3: preparing slag; s4: preparing an iron block; according to the invention, after the waste steel is collected and stored to a certain amount, the high-temperature liquid required to be discharged by waste gas in the blast furnace is guided for recycling, and the waste steel in a certain range is melted and separated out in a physical mode of a melting point, so that the separation of other metals is realized, the consumption of renewable electric energy is improved to increase the recycling rate of non-renewable energy, the recycling effect of the waste steel is increased, the content proportion of steel in the waste steel in the recycling process is improved by screening and distinguishing a large amount of heterochromatic metal in the recycled waste steel, and the recycling efficiency of the non-renewable energy is increased by improving the consumption of the renewable energy.
Description
Technical Field
The invention relates to the technical field of recycling of steelmaking wastes, in particular to a steelmaking method for recycling steelmaking wastes.
Background
Scrap steel refers to steel waste materials (such as trimming, end cutting and the like) which cannot become products in the production process of steel plants and steel materials in used and scrapped equipment and components, and the steel waste materials are called steel scrap; the component is pig iron called scrap iron, which is commonly called scrap steel. In the conventional scrap recycling and reprocessing processes, diversified impurities in the recycling process are easy to reduce the recycling efficiency of the scrap, so that research and development are needed to improve how to improve the impurity removal effect in the processing and utilization processes and the yield of the scrap after recycling and processing.
Disclosure of Invention
The invention aims to provide a steelmaking method for recycling steelmaking wastes, which aims to solve the problem of improving impurity removal rate and improving scrap steel reprocessing and tapping rate in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme: a steel-making method by recycling steel-making waste, which comprises the following steps:
s1: pretreatment of scrap steel: crushing large scrap steel, compressing the waste leftover materials into blocks, ensuring the size of the formed scrap steel to be in a certain range, screening solid waste by adopting magnetic separation in the treatment process to realize primary screening of the scrap steel, cleaning surface stains of the screened scrap steel mixture by utilizing various chemical solvents, adding the cleaned scrap steel into a drying box for drying, removing surface pollutants, preheating the surface-treated scrap steel by a preheating treatment blast furnace at 1300 ℃ and 1500 ℃, and carrying out primary steelmaking operation on the scrap steel for 12-24 hours to obtain unmelted scrap steel and remove a certain amount of low-melting-point dissimilar metals, improving the primary filtering effect, obtaining undissolved scrap steel blocks, and carrying out reprocessing;
s2: electric arc furnace steelmaking: adding 1.0-5.0t of waste steel blocks with high content and 3.0-7.5t of quartz sand processed in the step S1 into an electric arc furnace, and blowing and refining;
s3: preparing slag: preheating in step S2 for 2-5 minutes, and adding materials for slag preparation;
s4: preparing an iron block: and processing the molten steel through a top-blown oxygen converter to form a steel ingot, and repeating the steps for processing.
Preferably, the preheating blast furnace in the step S1 includes high-temperature furnace water to be discharged after being processed in the step S4.
Preferably, the reprocessing at step S1 is to crush the scrap steel into blocks according to the size and dimension of the molten scrap steel blocks.
Preferably, the composite slag former in the step S3 mainly comprises 15-30 parts of CaO, 30-45 parts of SiO2, 5-10 parts of MgO, 5-10 parts of Al203, 0-5 parts of Fe203 and 0-5 parts of Cr 203.
Preferably, the step S1 further includes a molten steel melting furnace with a temperature of 1500-.
Compared with the prior art, the invention has the beneficial effects that:
1) according to the invention, after the waste steel is collected and stored to a certain amount, the high-temperature liquid required to be discharged by waste gas in the blast furnace is guided for reuse, and the waste steel in a certain range is melted and separated out in a melting point physical mode, so that the separation of other metals is realized, the consumption of renewable electric energy is improved to increase the repeated utilization rate of non-renewable energy sources, and the reuse effect of the waste steel is increased;
2) according to the invention, a large amount of heterochromatic metals contained in the recycled steel scrap are screened and distinguished, the content proportion of steel in the steel scrap in the recycling process is improved through the physical properties of different melting points of the metals, and the recycling efficiency of the non-renewable energy steel is increased through improving the electric energy consumption of renewable energy.
Drawings
FIG. 1 is a process flow diagram of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. 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 "upper", "lower", "inner", "outer", "top/bottom", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "disposed," "sleeved/connected," "connected," and the like are to be construed broadly, e.g., "connected," which may be fixedly connected, detachably connected, or integrally connected; 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.
Referring to fig. 1, the present invention provides a technical solution: a steel-making method by recycling steel-making waste, which comprises the following steps:
s1: pretreatment of scrap steel: crushing large scrap steel, compressing the waste leftover materials into blocks, ensuring the size of the formed scrap steel to be in a certain range, screening solid waste by adopting magnetic separation in the treatment process to realize the primary screening of the scrap steel, cleaning surface stains of the screened scrap steel mixture by utilizing various chemical solvents, adding the cleaned scrap steel into a drying box for drying, removing surface pollutants, passing the scrap steel after the surface treatment through a preheating treatment blast furnace with the temperature of 1300 ℃ and 1500 ℃, performing primary steelmaking operation on the scrap steel for 12-24 hours to obtain unmelted scrap steel and remove a certain amount of metals with low dissimilar melting points in the preheating treatment blast furnace, adding the scrap steel into a melting furnace by a melting furnace with the temperature of 1500 ℃ and 1800 ℃, introducing molten steel into a preheating treatment blast furnace for solidification and precipitation, separating dissimilar metals above a temperature range, improving a primary filtering effect to obtain undissolved steel scrap blocks, crushing the steel scrap blocks according to the size and dimension of the molten steel scrap blocks, and compressing the steel scrap blocks into blocks;
s2: electric arc furnace steelmaking: adding 1.0-5.0t of waste steel blocks with high content and 3.0-7.5t of quartz sand processed in the step S1 into an electric arc furnace, and blowing and refining;
s3: preparing slag: preheating after blowing for 2-5 minutes in the step S2, adding materials for preparing slag, wherein the materials can comprise 6-10t of lime, 7-9t of fluorite and 5-10t of composite slagging agent, and after the materials are refined for 5-10 minutes, 1-2t of lime and 0.5-1t of composite slagging agent are added every 0.5-1 hour, and the composite slagging agent mainly comprises 15-30 parts of CaO, 30-45 parts of SiO2, 5-10 parts of MgO, 5-10 parts of Al203, 0-5 parts of Fe203 and 0-5 parts of Cr 203;
s4: preparing an iron block: and processing the molten steel through a top-blown oxygen converter to form a steel ingot, and repeating the steps for processing.
Example one
S1: pretreatment of scrap steel: crushing large scrap steel, compressing the waste leftover materials into blocks, ensuring that the size of the formed scrap steel is in a certain range, screening solid waste by adopting magnetic separation in the treatment process to realize primary screening of the scrap steel, cleaning surface stains of the screened scrap steel mixture by utilizing various chemical solvents, adding the cleaned scrap steel into a drying box for drying, removing surface pollutants, passing the surface-treated scrap steel through a preheating treatment blast furnace with the temperature of 1300 ℃, performing primary steelmaking operation on the scrap steel for 12-24 hours by using high-temperature furnace water to be discharged after processing in the step S4 in the preheating treatment blast furnace to obtain unmelted scrap steel and remove a certain amount of low-melting-point dissimilar metals, further comprising a molten steel melting furnace with the temperature of 1800 ℃, adding the scrap steel into the molten steel melting furnace, introducing molten steel into a preheating treatment blast furnace for solidification and precipitation, separating dissimilar metals above a temperature range, improving a primary filtering effect to obtain undissolved steel scrap blocks, crushing the steel scrap blocks according to the size and dimension of the molten steel scrap blocks, and compressing the steel scrap blocks into blocks;
s2: electric arc furnace steelmaking: adding 1.0t of waste steel blocks with high content and 3.0t of quartz sand processed in the step S1 into an electric arc furnace, and blowing and refining;
s3: preparing slag: preheating by blowing for 2 minutes in the step S2, adding 6t of lime, 7t of fluorite and 5t of composite slagging agent, and adding 1t of lime and 0.5t of composite slagging agent every 0.5 hour after 5 minutes of refining, wherein the composite slagging agent mainly comprises 30 parts of CaO, 45 parts of SiO2, 10 parts of MgO, 10 parts of Al203, 5 parts of Fe203 and 0 part of Cr 203;
s4: preparing an iron block: and processing the molten steel through a top-blown oxygen converter to form a steel ingot, and repeating the steps for processing.
Example two
S1: pretreatment of scrap steel: crushing a large piece of scrap steel, compressing waste leftover materials into blocks, ensuring that the size of the formed scrap steel is in a certain range, screening solid waste by adopting magnetic separation in the treatment process to realize primary screening of the scrap steel, cleaning surface stains of a screened scrap steel mixture by utilizing various chemical solvents, adding the cleaned scrap steel into a drying box for drying, removing surface pollutants, passing the surface-treated scrap steel through a preheating treatment blast furnace with the temperature of 1500 ℃, performing primary steelmaking operation on the scrap steel for 24 hours by using high-temperature furnace water to be discharged after processing in the step S4 in the preheating treatment blast furnace to obtain unmelted scrap steel and remove a certain amount of low-melting-point dissimilar metals, further comprising a molten steel melting furnace with the temperature of 1600 ℃, adding the scrap steel into the melting furnace, introducing the molten steel into the preheating treatment blast furnace for solidification and precipitation, separating the dissimilar metals above the temperature range, improving the primary filtering effect to obtain undissolved scrap steel blocks, crushing the scrap steel blocks according to the size and dimension of the molten scrap steel blocks, and then compressing the scrap steel blocks into blocks;
s2: electric arc furnace steelmaking: adding 5.0t of waste steel blocks with high content and 7.5t of quartz sand processed in the step S1 into an electric arc furnace, and blowing and refining;
s3: preparing slag: preheating by blowing for 5 minutes in the step S2, adding 10t of lime, 9t of fluorite and 10t of composite slagging agent, and adding 2t of lime and 1t of composite slagging agent every 1 hour after refining for 10 minutes, wherein the composite slagging agent mainly comprises 30 parts of CaO, 30 parts of SiO2, 5 parts of MgO, 5 parts of Al203, 5 parts of Fe203 and 5 parts of Cr 203;
s4: preparing an iron block: and processing the molten steel through a top-blown oxygen converter to form a steel ingot, and repeating the steps for processing.
EXAMPLE III
S1: pretreatment of scrap steel: crushing a large piece of scrap steel, compressing waste leftover materials into blocks, ensuring that the size of the formed scrap steel is in a certain range, screening solid waste by adopting magnetic separation in the treatment process to realize primary screening of the scrap steel, cleaning surface stains of a screened scrap steel mixture by utilizing various chemical solvents, adding the cleaned scrap steel into a drying box for drying, removing surface pollutants, passing the surface-treated scrap steel through a preheating treatment blast furnace at 1400 ℃, performing primary steelmaking operation on the scrap steel for 18 hours by using high-temperature furnace water to be discharged after processing in step S4 to obtain unmelted scrap steel and remove a certain amount of low-melting-point dissimilar metals, further comprising a molten steel melting furnace at 1600 ℃, adding the scrap steel into the melting furnace, introducing the molten steel into the preheating treatment blast furnace for solidification and precipitation, separating the dissimilar metals above the temperature range, improving the primary filtering effect to obtain undissolved scrap steel blocks, crushing the scrap steel blocks according to the size and dimension of the molten scrap steel blocks, and then compressing the scrap steel blocks into blocks;
s2: electric arc furnace steelmaking: adding the 3.0t of waste steel blocks with high content and the 5.0t of quartz sand processed in the step S1 into an electric arc furnace, and blowing and refining;
s3: preparing slag: preheating by blowing for 4 minutes in the step S2, adding 8t of lime, 8t of fluorite and 8t of composite slagging agent, and adding 1.5t of lime and 0.8t of composite slagging agent every 0.6 hour after 8 minutes of refining, wherein the composite slagging agent mainly comprises 30 parts of CaO, 45 parts of SiO2, 10 parts of MgO, 5 parts of Al203, 5 parts of Fe203 and 5 parts of Cr 203;
s4: preparing an iron block: and processing the molten steel through a top-blown oxygen converter to form a steel ingot, and repeating the steps for processing.
While there have been shown and described the fundamental principles and essential features of the invention and advantages thereof, it will be apparent to those skilled in the art that the invention is not limited to the details of the foregoing exemplary embodiments, but is capable of other specific forms without departing from the spirit or essential characteristics thereof; the present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein, and any reference signs in the claims are not intended to be construed as limiting the claim concerned.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (5)
1. A steelmaking method for recycling steelmaking wastes is characterized in that: the steelmaking method for recycling the steelmaking waste comprises the following steps:
s1: pretreatment of scrap steel: crushing large scrap steel, compressing the waste leftover materials into blocks, ensuring the size of the formed scrap steel to be in a certain range, screening solid waste by adopting magnetic separation in the treatment process to realize primary screening of the scrap steel, cleaning surface stains of the screened scrap steel mixture by utilizing various chemical solvents, adding the cleaned scrap steel into a drying box for drying, removing surface pollutants, preheating the surface-treated scrap steel by a preheating treatment blast furnace at 1300 ℃ and 1500 ℃, and carrying out primary steelmaking operation on the scrap steel for 12-24 hours to obtain unmelted scrap steel and remove a certain amount of low-melting-point dissimilar metals, improving the primary filtering effect, obtaining undissolved scrap steel blocks, and carrying out reprocessing;
s2: electric arc furnace steelmaking: adding 1.0-5.0t of waste steel blocks with high content and 3.0-7.5t of quartz sand processed in the step S1 into an electric arc furnace, and blowing and refining;
s3: preparing slag: preheating in step S2 for 2-5 minutes, and adding materials for slag preparation;
s4: preparing an iron block: and processing the molten steel through a top-blown oxygen converter to form a steel ingot, and repeating the steps for processing.
2. The steelmaking method according to claim 1, in which the steelmaking scrap is reused, the method comprising: the preheating blast furnace in the step S1 includes high-temperature furnace water to be discharged after being processed in the step S4.
3. The steelmaking method according to claim 1, in which the steelmaking scrap is reused, the method comprising: the reprocessing in the step S1 is to crush the scrap steel blocks into blocks according to the size and dimension of the scrap steel blocks after melting.
4. The steelmaking method according to claim 1, in which the steelmaking scrap is reused, the method comprising: the composite slagging agent in the step S3 mainly comprises 15-30 parts of CaO, 30-45 parts of SiO2, 5-10 parts of MgO, 5-10 parts of Al203, 0-5 parts of Fe203 and 0-5 parts of Cr 203.
5. The steelmaking method according to claim 1, in which the steelmaking scrap is reused, the method comprising: the step S1 further comprises a molten steel melting furnace with the temperature of 1500-1800 ℃, scrap steel is added into the molten steel melting furnace, and the molten steel is introduced into the preheating treatment blast furnace in the step S1 to be solidified and separated out for screening out the dissimilar metals with high melting point.
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| CN202010033139.1A CN111139333A (en) | 2020-01-13 | 2020-01-13 | Steelmaking method for recycling steelmaking wastes |
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| CN202010033139.1A CN111139333A (en) | 2020-01-13 | 2020-01-13 | Steelmaking method for recycling steelmaking wastes |
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101899548A (en) * | 2010-08-10 | 2010-12-01 | 无锡西城特种船用板有限公司 | Novel process for scrap steel preheating and premelting and high-efficiency electric furnace steel making |
| CN102417948A (en) * | 2011-11-10 | 2012-04-18 | 李士琦 | Device and method for extracting impurity metal elements when electric furnace steelmaking scrap is preheated |
| KR20160014346A (en) * | 2014-07-29 | 2016-02-11 | 현대제철 주식회사 | Methods for manufacturing high clean steel |
| CN107326150A (en) * | 2017-06-16 | 2017-11-07 | 北京科技大学 | A kind of production method of full steel scrap electric arc furnaces duplex Clean Steel Smelting |
| CN108699622A (en) * | 2015-09-14 | 2018-10-23 | 达涅利机械设备股份公司 | Device and method for recycling and handling the residue from broken iron-containing waste |
| CN108950128A (en) * | 2018-07-20 | 2018-12-07 | 北京科技大学 | A kind of method that the steel safeguarding grades of abandoned car shell recycles |
| CN208472140U (en) * | 2018-07-09 | 2019-02-05 | 中冶京诚工程技术有限公司 | Steelmaking equipment for steelmaking by using scrap steel |
| CN109321812A (en) * | 2018-12-10 | 2019-02-12 | 辽宁科技学院 | A method of steel additive agent is prepared by raw material of steel scrap |
-
2020
- 2020-01-13 CN CN202010033139.1A patent/CN111139333A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101899548A (en) * | 2010-08-10 | 2010-12-01 | 无锡西城特种船用板有限公司 | Novel process for scrap steel preheating and premelting and high-efficiency electric furnace steel making |
| CN102417948A (en) * | 2011-11-10 | 2012-04-18 | 李士琦 | Device and method for extracting impurity metal elements when electric furnace steelmaking scrap is preheated |
| KR20160014346A (en) * | 2014-07-29 | 2016-02-11 | 현대제철 주식회사 | Methods for manufacturing high clean steel |
| CN108699622A (en) * | 2015-09-14 | 2018-10-23 | 达涅利机械设备股份公司 | Device and method for recycling and handling the residue from broken iron-containing waste |
| CN107326150A (en) * | 2017-06-16 | 2017-11-07 | 北京科技大学 | A kind of production method of full steel scrap electric arc furnaces duplex Clean Steel Smelting |
| CN208472140U (en) * | 2018-07-09 | 2019-02-05 | 中冶京诚工程技术有限公司 | Steelmaking equipment for steelmaking by using scrap steel |
| CN108950128A (en) * | 2018-07-20 | 2018-12-07 | 北京科技大学 | A kind of method that the steel safeguarding grades of abandoned car shell recycles |
| CN109321812A (en) * | 2018-12-10 | 2019-02-12 | 辽宁科技学院 | A method of steel additive agent is prepared by raw material of steel scrap |
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Application publication date: 20200512 |