CN112280972A - Process method for preparing metallized hot pellets by waste heat of submerged arc furnace - Google Patents
Process method for preparing metallized hot pellets by waste heat of submerged arc furnace Download PDFInfo
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- CN112280972A CN112280972A CN202011044132.6A CN202011044132A CN112280972A CN 112280972 A CN112280972 A CN 112280972A CN 202011044132 A CN202011044132 A CN 202011044132A CN 112280972 A CN112280972 A CN 112280972A
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- Prior art keywords
- pellets
- submerged arc
- arc furnace
- metallized
- pressure
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Classifications
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/14—Agglomerating; Briquetting; Binding; Granulating
- C22B1/24—Binding; Briquetting ; Granulating
- C22B1/2406—Binding; Briquetting ; Granulating pelletizing
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B13/00—Making spongy iron or liquid steel, by direct processes
- C21B13/0006—Making spongy iron or liquid steel, by direct processes obtaining iron or steel in a molten state
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B13/00—Making spongy iron or liquid steel, by direct processes
- C21B13/12—Making spongy iron or liquid steel, by direct processes in electric furnaces
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/02—Roasting processes
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
- F27D17/004—Systems for reclaiming waste heat
Abstract
The invention discloses a process method for preparing metallized hot pellets by waste heat of a submerged arc furnace, which comprises the following steps: the method comprises the following steps: mixing and stirring the mineral powder, the reducing agent and the flux uniformly to obtain mixed powder; step two: guiding the mixed powder into a high-pressure ball press to be pressed into blocks, and forming the blocks into high-pressure pressed pellets; step three: conveying the high-pressure briquetting pellets into a pellet heating device communicated with a feeding pipe of the submerged arc furnace through a conveyor; the whole process flow of the process method for preparing the metallized hot pellets by the waste heat of the submerged arc furnace is short and practical, the smelting time of the metallized pellets is shortened, meanwhile, the metallized hot pellets are fed into the furnace in a hot state, the energy consumption of cold-state metallized pellets fed into the furnace in a conventional way is reduced, and the energy consumption of the conventional metallized hot pellets in the manufacturing process is reduced because the high-temperature flue gas discharged by a feeding pipe pipeline is utilized for the production of the metallized hot pellets, so the cost of the metallized hot pellets manufactured by the method is low.
Description
Technical Field
The invention relates to the technical field of waste heat utilization of submerged arc furnaces, in particular to a process method for preparing metallized hot pellets by using waste heat of the submerged arc furnaces.
Background
The submerged arc furnace generates a large amount of residual heat smoke when working, the temperature reaches more than 1000 ℃, and aiming at the high-temperature residual heat, a plurality of submerged arc furnace residual heat utilization technologies are implemented in China: for example, in a flue gas waste heat recovery system of a submerged arc furnace with the patent number of CN201721138055.4, heat exchange is directly carried out between the flue gas and high-temperature flue gas through three water tanks, the flue gas is introduced into a waste heat boiler after waste heat recovery, and meanwhile, the heat exchange time is prolonged through a water distribution plate and an air distribution plate, so that the waste heat recovery rate is improved; patent No. CN201920343146.4 a hot stove waste heat recovery device in ore deposit for high carbon ferrochrome production, through being provided with the pipe of different high-order on the hot stove in ore deposit, carry on the water conservancy diversion with the flue gas of hot stove middle section and eminence in ore deposit, in order to improve the flue gas recovery efficiency, simultaneously, utilize the filter to filter the flue gas, in order to reduce environmental pollution, wherein, the large granule smoke and dust of insufficient combustion can drop to collect and recycle in collecting the storehouse, through being provided with water tank and waste heat pipe, on the one hand, utilize the indoor heat of flue gas to heat the liquid in the water tank, on the other hand, the hot steam in the water tank is derived through the waste heat pipe, for the combustion-supporting or dry use of hot stove in ore deposit; the flue gas treatment device of the submerged arc furnace with the patent number of CN201921795611.4 comprises the submerged arc furnace, a flue gas pipe and a treatment chamber, wherein a spray pipe is arranged at the upper part of the treatment chamber, the spray pipe is inserted between the inner wall of the treatment chamber and the outer wall of a cold water pipe from the outside, and a downward spray opening is arranged on the spray pipe, so that the flue gas cooling effect of the utility model is good; the technologies utilize the waste heat smoke of the submerged arc furnace to achieve the effects of energy conservation and consumption reduction, but the technology is hardly applied to the aspect of metallized pellets.
The metallized pellet is the raw material for smelting in ore-smelting furnace, and is made up by using mineral powder, reducing agent and flux through the processes of mixing and stirring according to a certain proportion, briquetting, feeding them into the kilns of rotary kiln, tunnel kiln, belt furnace and shaft furnace, etc. and utilizing natural gas and coal gas as energy sources to make heating, sintering or reducing to obtain the pellet with high metallization rate.
Disclosure of Invention
The invention aims to provide a process method for preparing metallized hot pellets by using waste heat of a submerged arc furnace, so as to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme:
the process method for preparing the metallized hot pellets by the waste heat of the submerged arc furnace comprises the following steps:
the method comprises the following steps: mixing and stirring the mineral powder, the reducing agent and the flux uniformly to obtain mixed powder;
step two: guiding the mixed powder into a high-pressure ball press to be pressed into blocks, and forming the blocks into high-pressure pressed pellets;
step three: conveying the high-pressure briquetting pellets into a pellet heating device communicated with a feeding pipe of the submerged arc furnace through a conveyor;
step four: introducing high-temperature flue gas generated during the operation of the submerged arc furnace into the pellet heating device from a feeding pipe through a fan, and preheating and reducing the high-pressure briquetting pellets;
step five: the mineral powder and the reducing agent in the high-pressure briquette pellets are gradually subjected to high-temperature reduction in high-temperature flue gas to form metallized hot pellets with the metallization rate of more than 80% and the self temperature of more than 800 ℃;
step six: feeding the metallized hot pellets into a pipe pipeline from a submerged arc furnace, and gradually feeding the metallized hot pellets into the submerged arc furnace;
step seven: smelting the metallized hot pellets into molten steel by a submerged arc furnace.
As a further scheme of the invention: in the first step, the mixed powder comprises the following components in percentage by weight: mineral powder: 50-65% of a reducing agent: 15-35% of flux: 15 to 25 percent.
As a further scheme of the invention: the pressurizing form of the high-pressure ball press is hydraulic constant pressure, and the rotating speed of a main shaft of the high-pressure ball press is 10-15 r/min.
As a further scheme of the invention: the working mode of the fan is a negative pressure air extraction mode.
Compared with the prior art, the invention has the beneficial effects that:
the whole process flow of the process method for preparing the metallized hot pellets by the waste heat of the submerged arc furnace is short and practical, the smelting time of the metallized pellets is shortened, meanwhile, the metallized hot pellets are fed into the furnace in a hot state, the energy consumption of cold-state metallized pellets fed into the furnace in a conventional way is reduced, and the production of the metallized hot pellets is carried out by utilizing high-temperature flue gas discharged by a feeding pipe pipeline, so that the energy consumption of the conventional metallized pellets in the manufacturing process is reduced, and the cost of the metallized hot pellets manufactured by the method is low, and the waste heat of the submerged arc furnace is utilized most directly and fully.
Drawings
FIG. 1 is a process flow diagram of a process method for preparing metallized hot pellets by waste heat of a submerged arc furnace.
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.
Referring to fig. 1, the process of preparing metallized hot pellets by using waste heat of a submerged arc furnace includes the following steps:
the method comprises the following steps: mixing and stirring the mineral powder, the reducing agent and the flux uniformly to obtain mixed powder;
step two: guiding the mixed powder into a high-pressure ball press to be pressed into blocks, and forming the blocks into high-pressure pressed pellets;
step three: conveying the high-pressure briquetting pellets into a pellet heating device communicated with a feeding pipe of the submerged arc furnace through a conveyor;
step four: introducing high-temperature flue gas generated during the operation of the submerged arc furnace into the pellet heating device from a feeding pipe through a fan, and preheating and reducing the high-pressure briquetting pellets;
step five: the mineral powder and the reducing agent in the high-pressure briquette pellets are gradually subjected to high-temperature reduction in high-temperature flue gas to form metallized hot pellets with the metallization rate of more than 80% and the self temperature of more than 800 ℃;
step six: the metallized hot pellets are gradually sent into the submerged arc furnace through a submerged arc furnace feeding pipe pipeline (a submerged arc furnace feeding hole);
step seven: smelting the metallized hot pellets into molten steel by a submerged arc furnace.
In the first step, the mixed powder comprises the following components in percentage by weight: mineral powder: 50-65% of a reducing agent: 15-35% of flux: 15 to 25 percent.
The pressurizing form of the high-pressure ball press is hydraulic constant pressure, and the rotating speed of a main shaft of the high-pressure ball press is 10-15 r/min.
The working mode of the fan is a negative pressure air extraction mode.
The first embodiment is as follows:
conveying a reducing agent in a reducing agent bin, mineral powder in a mineral powder bin and a flux in a flux bin into a mixing stirrer through a spiral feeding machine, wherein the ratio of the mineral powder to the reducing agent to the flux is 55:25:20, and the particle sizes of the mineral powder to the reducing agent to the flux are 0.3-1.2 mm;
uniformly stirring the mineral powder, the reducing agent and the flux by using a mixing stirrer, wherein the rotating speed of the mixing stirrer is 50r/min, and the stirring time is 30 min;
guiding the mixed powder into a high-pressure ball press to be pressed into blocks, and forming the blocks into high-pressure pressed pellets, wherein the rotating speed of a main shaft of the high-pressure ball press is 12r/min, and the forming pressure is 33 MPa;
sending the high-pressure briquetting pellets into a pellet heating device, introducing high-temperature flue gas generated during the operation of a submerged arc furnace into the pellet heating device from a feeding pipe pipeline by a fan connected with the pellet heating device in a negative-pressure air exhaust mode, and preheating and reducing the high-pressure briquetting pellets;
the mineral powder and the reducing agent in the high-pressure briquette pellets are gradually subjected to high-temperature reduction in high-temperature flue gas to form metallized hot pellets with the metallization rate of more than 80% and the self temperature of more than 800 ℃;
feeding the metallized hot pellets into a pipe pipeline from a submerged arc furnace, and gradually feeding the metallized hot pellets into the submerged arc furnace;
smelting the metallized hot pellets into molten steel by a submerged arc furnace.
Example two:
conveying the reducing agent in the reducing agent bin, the mineral powder in the mineral powder bin and the flux in the flux bin into a mixing stirrer through a spiral feeding machine, wherein the ratio of the mineral powder to the reducing agent to the flux is 60:21:19, and the particle sizes of the mineral powder to the reducing agent to the flux are 0.5-1.1 mm;
uniformly stirring the mineral powder, the reducing agent and the flux by using a mixing stirrer, wherein the rotating speed of the mixing stirrer is 60r/min, and the stirring time is 30 min;
guiding the mixed powder into a high-pressure ball press to be pressed into blocks, and forming the blocks into high-pressure pressed pellets, wherein the rotating speed of a main shaft of the high-pressure ball press is 12r/min, and the forming pressure is 35 MPa;
sending the high-pressure briquetting pellets into a pellet heating device, introducing high-temperature flue gas generated during the operation of a submerged arc furnace into the pellet heating device from a feeding pipe pipeline by a fan connected with the pellet heating device in a negative-pressure air exhaust mode, and preheating and reducing the high-pressure briquetting pellets;
the mineral powder and the reducing agent in the high-pressure briquette pellets are gradually subjected to high-temperature reduction in high-temperature flue gas to form metallized hot pellets with the metallization rate of more than 80% and the self temperature of more than 800 ℃;
feeding the metallized hot pellets into a pipe pipeline from a submerged arc furnace, and gradually feeding the metallized hot pellets into the submerged arc furnace;
smelting the metallized hot pellets into molten steel by a submerged arc furnace.
Example three:
conveying the reducing agent in the reducing agent bin, the mineral powder in the mineral powder bin and the flux in the flux bin into a mixing stirrer through a spiral feeding machine, wherein the ratio of the mineral powder to the reducing agent to the flux is 53:21:26, and the particle sizes of the mineral powder to the reducing agent to the flux are 0.1-0.9 mm;
uniformly stirring the mineral powder, the reducing agent and the flux by using a mixing stirrer, wherein the rotating speed of the mixing stirrer is 75r/min, and the stirring time is 30 min;
guiding the mixed powder into a high-pressure ball press to be pressed into blocks, and forming the blocks into high-pressure pressed pellets, wherein the rotating speed of a main shaft of the high-pressure ball press is 10r/min, and the forming pressure is 37 MPa;
sending the high-pressure briquetting pellets into a pellet heating device, introducing high-temperature flue gas generated during the operation of a submerged arc furnace into the pellet heating device from a feeding pipe pipeline by a fan connected with the pellet heating device in a negative-pressure air exhaust mode, and preheating and reducing the high-pressure briquetting pellets;
the mineral powder and the reducing agent in the high-pressure briquette pellets are gradually subjected to high-temperature reduction in high-temperature flue gas to form metallized hot pellets with the metallization rate of more than 80% and the self temperature of more than 800 ℃;
feeding the metallized hot pellets into a pipe pipeline from a submerged arc furnace, and gradually feeding the metallized hot pellets into the submerged arc furnace;
smelting the metallized hot pellets into molten steel by a submerged arc furnace.
The process method for preparing metallized hot pellets by using waste heat of the submerged arc furnace provides a new way for utilizing high-temperature flue gas of the submerged arc furnace, equipment adopted in the process flow is general equipment, and technical parameters and functions of the equipment are not described one by one.
The whole process flow of the process method for preparing the metallized hot pellets by the waste heat of the submerged arc furnace is short and practical, the smelting time of the metallized pellets is shortened, meanwhile, the metallized hot pellets are fed into the furnace in a hot state, the energy consumption of cold-state metallized pellets fed into the furnace in a conventional way is reduced, and the production of the metallized hot pellets is carried out by utilizing high-temperature flue gas discharged by a feeding pipe pipeline, so that the energy consumption of the conventional metallized pellets in the manufacturing process is reduced, and the cost of the metallized hot pellets manufactured by the method is low, and the waste heat of the submerged arc furnace is utilized most directly and fully.
Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that various changes in the embodiments and/or modifications of the invention can be made, and equivalents and modifications of some features of the invention can be made without departing from the spirit and scope of the invention.
Claims (4)
1. The process method for preparing the metallized hot pellets by the waste heat of the submerged arc furnace is characterized by comprising the following steps of: the method comprises the following steps:
the method comprises the following steps: mixing and stirring the mineral powder, the reducing agent and the flux uniformly to obtain mixed powder;
step two: guiding the mixed powder into a high-pressure ball press to be pressed into blocks, and forming the blocks into high-pressure pressed pellets;
step three: conveying the high-pressure briquetting pellets into a pellet heating device communicated with a feeding pipe of the submerged arc furnace through a conveyor;
step four: introducing high-temperature flue gas generated during the operation of the submerged arc furnace into the pellet heating device from a feeding pipe through a fan, and preheating and reducing the high-pressure briquetting pellets;
step five: the mineral powder and the reducing agent in the high-pressure briquette pellets are gradually subjected to high-temperature reduction in high-temperature flue gas to form metallized hot pellets with the metallization rate of more than 80% and the self temperature of more than 800 ℃;
step six: feeding the metallized hot pellets into a pipe pipeline from a submerged arc furnace, and gradually feeding the metallized hot pellets into the submerged arc furnace;
step seven: smelting the metallized hot pellets into molten steel by a submerged arc furnace.
2. The process method for preparing metallized hot pellets by using waste heat of the submerged arc furnace as claimed in claim 1, characterized in that: in the first step, the mixed powder comprises the following components in percentage by weight: mineral powder: 50-65% of a reducing agent: 15-35% of flux: 15 to 25 percent.
3. The process method for preparing metallized hot pellets by using waste heat of the submerged arc furnace as claimed in claim 1, characterized in that: the pressurizing form of the high-pressure ball press is hydraulic constant pressure, and the rotating speed of a main shaft of the high-pressure ball press is 10-15 r/min.
4. The process method for preparing metallized hot pellets by using waste heat of the submerged arc furnace as claimed in claim 1, characterized in that: the working mode of the fan is a negative pressure air extraction mode.
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| CN202011044132.6A CN112280972A (en) | 2020-09-29 | 2020-09-29 | Process method for preparing metallized hot pellets by waste heat of submerged arc furnace |
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| CN202011044132.6A CN112280972A (en) | 2020-09-29 | 2020-09-29 | Process method for preparing metallized hot pellets by waste heat of submerged arc furnace |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000169906A (en) * | 1998-12-04 | 2000-06-20 | Nippon Steel Corp | Treatment of exhaust gas in rotary furnace hearth type reduction furnace and device therefor |
| CN103451344A (en) * | 2013-09-02 | 2013-12-18 | 北京科技大学 | CEO compound smelting reduction ironmaking plant and technology |
| CN105908061A (en) * | 2016-06-12 | 2016-08-31 | 江苏省冶金设计院有限公司 | Method for producing high-carbon ferrochrome |
-
2020
- 2020-09-29 CN CN202011044132.6A patent/CN112280972A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000169906A (en) * | 1998-12-04 | 2000-06-20 | Nippon Steel Corp | Treatment of exhaust gas in rotary furnace hearth type reduction furnace and device therefor |
| CN103451344A (en) * | 2013-09-02 | 2013-12-18 | 北京科技大学 | CEO compound smelting reduction ironmaking plant and technology |
| CN105908061A (en) * | 2016-06-12 | 2016-08-31 | 江苏省冶金设计院有限公司 | Method for producing high-carbon ferrochrome |
Non-Patent Citations (3)
| Title |
|---|
| 《化学工程手册》编辑委员会: "《化学工程手册5》", 31 October 1989, 化学工业出版社 * |
| 中国节能环保集团公司: "《2014中国节能减排发展报告：能源与环境的双赢机会》", 31 December 2014, 中国经济出版社 * |
| 云正宽: "《冶金工程设计，第3册，机电设备与工业窑炉设计》", 30 June 2006, 冶金工业出版社 * |
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