CN111893296B - Hot-pressed scrap steel carburetion method and device thereof - Google Patents
Hot-pressed scrap steel carburetion method and device thereof Download PDFInfo
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 56
- 239000010959 steel Substances 0.000 title claims abstract description 56
- 238000000034 method Methods 0.000 title claims abstract description 42
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 80
- 229910052742 iron Inorganic materials 0.000 claims abstract description 40
- 239000004449 solid propellant Substances 0.000 claims abstract description 37
- 239000000428 dust Substances 0.000 claims abstract description 28
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 23
- 238000010438 heat treatment Methods 0.000 claims abstract description 23
- 239000000463 material Substances 0.000 claims abstract description 23
- 238000007731 hot pressing Methods 0.000 claims abstract description 22
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 20
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 19
- 230000008569 process Effects 0.000 claims abstract description 19
- 239000003546 flue gas Substances 0.000 claims abstract description 17
- 238000006477 desulfuration reaction Methods 0.000 claims abstract description 16
- 230000023556 desulfurization Effects 0.000 claims abstract description 16
- 238000002156 mixing Methods 0.000 claims abstract description 9
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 claims description 14
- 239000000779 smoke Substances 0.000 claims description 14
- 239000002245 particle Substances 0.000 claims description 12
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 6
- 238000003860 storage Methods 0.000 claims description 5
- 239000003034 coal gas Substances 0.000 claims description 4
- 230000005484 gravity Effects 0.000 claims description 4
- 239000003345 natural gas Substances 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims description 2
- 229910052751 metal Inorganic materials 0.000 abstract description 11
- 239000002184 metal Substances 0.000 abstract description 11
- 238000009851 ferrous metallurgy Methods 0.000 abstract 1
- 238000009628 steelmaking Methods 0.000 description 12
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 5
- 239000002994 raw material Substances 0.000 description 5
- 239000002699 waste material Substances 0.000 description 5
- 239000007789 gas Substances 0.000 description 4
- 238000003825 pressing Methods 0.000 description 4
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 3
- 239000001569 carbon dioxide Substances 0.000 description 3
- 229910002092 carbon dioxide Inorganic materials 0.000 description 3
- 239000000446 fuel Substances 0.000 description 3
- 229910052760 oxygen Inorganic materials 0.000 description 3
- 239000001301 oxygen Substances 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 229910002091 carbon monoxide Inorganic materials 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 238000004321 preservation Methods 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 230000033764 rhythmic process Effects 0.000 description 2
- 239000002893 slag Substances 0.000 description 2
- 229910052717 sulfur Inorganic materials 0.000 description 2
- 239000011593 sulfur Substances 0.000 description 2
- 238000003723 Smelting Methods 0.000 description 1
- 238000005054 agglomeration Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- CSJDCSCTVDEHRN-UHFFFAOYSA-N methane;molecular oxygen Chemical compound C.O=O CSJDCSCTVDEHRN-UHFFFAOYSA-N 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000013021 overheating Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
Classifications
-
- 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
-
- 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
-
- 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
- Y02P10/10—Reduction of greenhouse gas [GHG] emissions
- Y02P10/143—Reduction of greenhouse gas [GHG] emissions of methane [CH4]
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Mechanical Engineering (AREA)
- Manufacture And Refinement Of Metals (AREA)
Abstract
The invention discloses a hot-pressing scrap steel carburetion method, which belongs to the field of ferrous metallurgy and comprises a solid fuel crushing procedure; a material proportioning procedure; mixing and heating in a rotary kiln; flue gas dust removal and desulfurization; hot pressing: compared with the prior art, the process can improve the carbon content in the hot briquetting; the metal yield is increased by more than 3%, and the consumption of steel and iron materials is reduced.
Description
Technical Field
The invention belongs to the technical field of steelmaking raw material preparation, and particularly relates to a hot-pressing scrap steel carburetion method and a device thereof.
Background
Scrap is one of the raw materials for steel-making production, and in order to achieve the effect of efficiently utilizing scrap, it is required that the scrap has a certain bulk and specific gravity, and has a high iron content and a small impurity. Among the scrap steel raw materials, there are some steel particles magnetically selected from steel slag, iron particles magnetically selected from iron-making fire slag, scrap iron generated in the deep processing process of steel products, and the like, and the scrap iron cannot be directly introduced into a furnace for smelting because of small granularity, and the existing method mainly adopts hot-pressing agglomeration equipment to form hot-pressed particle steel blocks and then make steel. Such as: chinese patent application No. h discloses a hot pressing method for a scrap hot briquetting machine and hot pressing process using the same (CN 201810802666.7): (1) heating the scrap iron crushed material, controlling the heating temperature to be 800-1100 ℃, and keeping the temperature of the scrap iron crushed material at 900-1000 ℃ for 10-15 minutes; (2) injecting the heated scrap iron crushed material into a cavity of a lower die; (3) after the scrap iron crushed materials are piled up to a certain height in the cavity, the material pressing cylinder compresses (the working pressure is 20MPa-30 MPa); the density of the cake is 5.9-6.1kg/dm.
This method separates heating and hydraulic compression, which can prevent the service life from being affected by overheating of the device, but still has the following problems: the waste steel hot briquetting process needs to raise the temperature of waste steel to above 800 ℃ (the heat preservation temperature is 900-1000 ℃), and partial waste steel at the temperature can be oxidized, so that the content of metal iron in the hot briquetting is reduced, the recovery rate of iron is further influenced, and the proportion of the metal iron of the hot briquetting to total iron is only about 90%. The hot-pressed block manufactured by the process can absorb a large amount of heat in the subsequent converter steelmaking production process, so that the consumption of iron and steel per ton is increased, and the yield and the rhythm of the converter are affected. Practice proves that every 1 ton of steel particle briquettes prepared by the prior art can reduce the total adding amount of scrap steel by 2.5 tons to 3 tons.
How to reduce the heat loss of the hot briquetting to steelmaking, improve the iron yield, ensure the steelmaking production rhythm, and become the research topic of the current scrap steel hot briquetting technology.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a hot-pressing steel scrap carbureting system, which is characterized in that proper solid fuel is ground to proper granularity, then the proper solid fuel is accurately added into steel grains according to proper proportion, then the steel grains are uniformly mixed and heated in a gradient way by using a rotary kiln, and finally a steel scrap briquetting containing certain fixed carbon is formed by pressing.
The technical scheme for solving the technical problems is as follows: the hot-pressing scrap steel carburetion method is characterized by comprising the following steps of:
(1) Solid fuel crushing procedure: crushing the solid fuel by using a crusher, and conveying the processed solid fuel to the batching process by using a belt conveyor;
(2) And (3) a batching procedure: the solid fuel, steel particles and scrap iron in the step (1) are proportioned and supplied to the mixing and heating step;
(3) Mixing and heating in a rotary kiln: loading the materials prepared in the step (2) into the tail part of a rotary kiln by using a loading belt conveyor, burning coal gas or natural gas at the head part of the rotary kiln, heating the materials in the kiln to about 900 ℃, gradually reducing the temperature along with the flow of the flue gas to the tail part of the rotary kiln until the temperature is within 200 ℃, enabling the flue gas to flow to the tail part of the rotary kiln, collecting the flue gas by a smoke hood arranged at the tail part of the rotary kiln, and entering a dust removal and desulfurization step;
(4) Flue gas dust removal and desulfurization process: the smoke hood is arranged at the tail part of the rotary kiln through a flue, the smoke is firstly pumped to a bag-type dust remover to collect dust by using a dust removing fan, then enters a desulfurization facility to remove sulfur dioxide, and finally the smoke reaching the standard is discharged to the atmosphere;
(5) Hot pressing: the high Wen Feigang discharged from the head of the rotary kiln is fed into a hydraulic machine cylinder after passing through a distributor, then a hydraulic station is operated to press the high Wen Feigang into blocks, and finally the hot pressed blocks are conveyed to a hot pressed block storage bin.
The maximum particle size of the solid fuel in the step (1) is not more than 5mm.
In the step (1), the solid fuel has a fixed carbon content of not less than 80% and ash content of not more than 15%.
The material proportioning in the step (2) is specifically an electronic belt scale adopting a PLC automatic proportioning system.
The specific gravity of the hot briquetting in the step (5) reaches 5.5t/m 3 The above.
And (5) conveying the adopted plate conveyor in the step (5).
Compared with the prior art, the invention has the following outstanding beneficial effects:
1. the process can raise the carbon content in the hot briquetting to 3-8%, avoid the problem that the steelmaking yield is affected due to large cooling when the hot briquetting is used in a converter, and can also play the roles of providing a heat source and reducing iron loss of ton steel when the carbon content is more than 5%;
2. the oxidation of the scrap steel in the heating process is prevented, the metal iron content can be improved by more than 3%, namely, the metal yield is increased by more than 3%, the consumption of steel and iron materials is reduced, and the method is a circular economy technology capable of effectively improving the efficiency.
Drawings
Fig. 1 is a process flow diagram of the present invention.
Detailed Description
The invention is further described below with reference to the drawings and the detailed description.
The invention provides a hot-pressed scrap steel carburetion method, which comprises the steps of solid fuel crushing, proportioning, rotary kiln mixed heating, flue gas dust removal and desulfurization and hot pressing.
(1) Solid fuel crushing step
The solid fuel is crushed by using a crusher (specifically, a four-roller crusher is adopted), the maximum granularity of the solid fuel is required to be not more than 5mm, and the granularity of more than 90% of the solid fuel is required to be less than 3 mm. Wherein, the solid fuel can be semi coke powder, coke powder and the like, and the fixed carbon content of the solid fuel is required to be not lower than 80 percent and the ash content is required to be not higher than 15 percent. The processed solid fuel is conveyed to the batching procedure by a belt conveyor.
(2) Batching process
And (3) mixing the solid fuel in the step (1) with steel particles and scrap iron according to a certain proportion and a certain proportioning amount, and supplying the mixture to the mixing and heating step. In particular to a PLC automatic batching system by using an electronic belt scale.
(3) Rotary kiln mixed heating process
And (3) loading the materials prepared in the step (2) into the tail part of the rotary kiln by using a loading belt conveyor, burning coal gas or natural gas at the head part of the rotary kiln, heating the materials in the kiln to about 900 ℃, gradually reducing the temperature along with the flow of flue gas to the tail part of the rotary kiln until the temperature is within 200 ℃, and adjusting the specific burning temperature and the coal gas flow by combining the scrap steel characteristics, the solid fuel adding proportion and the kiln head temperature (see the embodiment for details). Along with the rotation of the rotary kiln, the scrap steel moves from the tail part to the head part in the kiln, the temperature is gradually increased, and when the temperature reaches more than 232 ℃, sulfur in the solid fuel starts to oxidize and becomes sulfur dioxide:
S+O 2 ＝SO 2
when the temperature is continuously increased to 830 ℃, the solid fuel generates volatile matters, and simultaneously carbon in the material reacts with a small amount of oxygen nearby to generate carbon monoxide, so that the waste steel is prevented from being oxidized, and the generated volatile matters and carbon monoxide are fully combusted in contact with more oxygen after escaping from the material, and carbon dioxide and water vapor are generated.
2C+O 2 ＝2CO
2CO+O 2 ＝2CO 2
CH 4 +2O 2 ＝CO 2 +2H 2 O
The sulfur dioxide, the carbon dioxide and the water vapor flow along with the flue gas to the tail part of the rotary kiln, are collected by a smoke hood arranged at the tail part of the rotary kiln, and enter a dust removal and desulfurization process.
(4) Flue gas dust removal desulfurization process
The flue gas is firstly pumped to a cloth bag dust collector to collect dust by a dust removing fan, then enters a desulfurization facility to remove sulfur dioxide, and finally the flue gas reaching the standard is discharged to the atmosphere.
(5) Hot pressing process
The high Wen Feigang discharged from the head of the rotary kiln is put into a hydraulic machine cylinder after passing through a distributor, and then a hydraulic station is operated to press the high Wen Feigang into blocks with the proportion of 5.5t/m 3 Finally, the hot pressing blocks are conveyed to a hot pressing block storage bin by a plate conveyor.
According to the process, solid carbon-containing fuel particles with set specifications and steel particle scrap iron are dynamically mixed through the rotary kiln, sulfur and carbon are oxidized in stages under a temperature gradient, the contact between volatile matters and oxygen is increased by overflow gas disturbance, and the technical problem that part of scrap steel is oxidized at the heat preservation temperature of 900-1000 ℃ in the prior art is solved, so that the loss of metal iron content in a hot briquetting is reduced, the metal yield is increased, and the consumption of steel and iron materials is reduced.
At the same time, the process can also increase the carbon content in the hot pressed block. In the prior art, in the whole scrap steel heating process, the carbon content is lower, the carbon-oxygen reaction is weaker, a large amount of metal is oxidized, the oxidation degree of steel materials is high, the FeO content in a hot briquetting is overhigh, and the metal yield is reduced. And the carburization effect of the molten pool is poor, and the scrap steel is refractory. And the carbon is simply mixed, as in the Chinese patent application No. 200510134295.2, the carbon-containing material, the iron scale, the binder and the like are put into a mixer for stirring and mixing, and then pressed into balls, and the balls are dried to obtain the finished product. The process is characterized in that the rotary kiln is heated in a mixed mode under the temperature gradient, overflowed gas is disturbed, and the carburetion effect is uniform and definite. The carbon content can be improved to 3-8%, the problem that the steelmaking yield is affected due to large temperature reduction when the hot pressing block is used in the converter is avoided, and the effects of providing a heat source and reducing iron loss of ton steel can be achieved when the carbon content is more than 5%.
The equipment adopted by the process of the invention is shown in figure 1 and comprises a solid fuel crushing system 100, a batching system 200, a rotary kiln mixed heating system 300, a flue gas dust removal and desulfurization system 400 and a hot briquetting system 500.
The solid fuel crushing system 100 comprises a fuel crusher 12 and a belt conveyor 13. The fuel breaker 12 is preferably a four roll breaker. The solid fuel is crushed by using a four-roller crusher, the granularity of the solid fuel is required to reach 90% below 3mm, the maximum granularity is not more than 5mm, the fixed carbon content of the solid fuel is not less than 80%, and the ash content is not more than 15%. The processed solid fuel is transported by the belt conveyor 13 to the solid fuel silo 21 of the dosing system 200.
The batching system 200 comprises a solid fuel bin 21 and a steel material bin. Each bin is connected with a charging belt conveyor through an electronic belt scale. The concrete steel feed bin includes steel grain feed bin 22, iron fillings feed bin 23. The electronic belt scale adopts a PLC automatic batching system, and solid fuel, steel particles, scrap iron and the like are well matched according to a certain proportion and batching amount and are supplied to the charging belt conveyor 31 of the rotary kiln hybrid heating system 300.
The rotary kiln mixed heating system 300 comprises a charging belt conveyor 31, a rotary kiln 32, a combustion-supporting fan 33 and a gas burner 34. The head of the rotary kiln 32 is provided with a combustion-supporting fan 33 and a gas burner 34, and the tail of the rotary kiln 32 is provided with a charging belt conveyor 31 and a smoke hood 35. The sulfur dioxide, carbon dioxide and water vapor flow along with the flue gas to the tail of the rotary kiln 32, are collected by a smoke hood arranged at the tail of the rotary kiln, and enter a bag-type dust collector 41 of the dust removal and desulfurization system 400.
The dust removal desulfurization system 400 comprises a bag-type dust remover 41, a dust removal fan 42 and a desulfurization facility 43 which are sequentially connected through a flue. The bag-type dust collector 41 is connected with a smoke hood at the tail of the rotary kiln 32 through a flue, a dust removing fan 42 is used for pumping the smoke to the bag-type dust collector 41 to collect dust, then the dust enters a desulfurization facility 43 to remove sulfur dioxide, and finally the smoke reaching the standard is discharged to the atmosphere.
The scrap steel hot pressing system 500 comprises a distributor 51, a hydraulic press 52, a plate conveyor 54 and a hot pressing block storage bin 55. The head of the rotary kiln 32 is discharged to a height Wen Feigang, is fed into a cylinder of a hydraulic machine 52 connected with a hydraulic station 53 after passing through a distributor 51, and then the hydraulic station 53 is operated to press the height Wen Feigang into blocks with a proportion of 5.5t/m 3 The hot briquettes are finally transported to the hot briquettes storage bin 55 by the pallet conveyor 54.
For better verification, a comparative experiment was performed on a scrap hot press line in Hebei province.
Wherein, the control group comprises the following steps:
(1) Solid fuel crushing procedure: as in the group of examples.
(2) And (3) a batching procedure: as in the group of examples.
(3) Heating procedure: the mixed materials are heated by a heating furnace, and the heating temperature is controlled to be 900-920 ℃ for 10-15 minutes.
(4) Hot pressing: loading the high-temperature scrap steel into a hydraulic machine cylinder, and then operating the hydraulic machine to press the high Wen Feigang steel into blocks with the specific gravity of 6.0t/m 3 The above.
In the embodiment group, by adopting the technical scheme of the invention, parameters and result data are as follows.
The hot-pressed blocks produced in the above groups are applied to converter steelmaking production according to 50kg of steel per ton, and the comparison experiment results are as follows
Note that: the iron yield corresponding to the hot briquetting is calculated according to consumption data, and the iron content and the iron yield of other raw materials are given an empirical value, which are respectively: the iron content of the steel billet is 99%, the iron content of the molten iron is 94%, the iron yield is 98%, the iron content of other scrap steel is 98%, and the iron yield is 98%.
From the above results, it can be seen that: compared with the existing carburetion hot pressing technology, the technology of the invention adopts gradient heating, so that solid fuel, steel grains and scrap iron can be fully combined, the carbon content in a hot pressing block can be firstly increased to 3-8%, the problem of greatly increased ton steel consumption caused by adding cold pressing blocks is effectively solved, and when the carbon content reaches higher quantity, ton steel consumption can be continuously reduced, thereby improving steel yield; secondly, compared with the prior art, the technology has better reduction effect, the proportion of the metal iron in the pressing block to the total iron is improved by more than 3 percent, so that the metal yield in the steelmaking process is also improved by more than 3 percent, the improvement of the recovery of waste steel resource efficiency is facilitated, and the steelmaking raw material cost is reduced; and moreover, the blue carbon powder adopted by the technology belongs to clean energy, is low in price, is applied to steelmaking production through hot pressing, replaces part of high-price carburant, and is also very beneficial to reducing steelmaking cost.
It is noted that while the present invention has been described in detail with respect to specific embodiments thereof, it will be apparent to those skilled in the art that various modifications can be made therein without departing from the spirit and scope thereof.
Claims (3)
1. The hot-pressing scrap steel carburetion method is characterized by comprising the following steps of:
(1) Solid fuel crushing procedure: crushing the solid fuel by using a crusher, and conveying the processed solid fuel to a batching process by using a belt conveyor; the maximum particle size of the solid fuel is not more than 5mm; the fixed carbon content is not less than 80%, and the ash content is not more than 15%;
(2) And (3) a batching procedure: mixing the solid fuel in the step (1) with steel particles and scrap iron, and supplying the mixture to a mixing and heating step;
(3) Mixing and heating in a rotary kiln: loading the materials prepared in the step (2) into the tail part of a rotary kiln by using a loading belt conveyor, burning coal gas or natural gas at the head part of the rotary kiln, heating the materials in the kiln to about 900 ℃, gradually reducing the temperature along with the flow of the flue gas to the tail part of the rotary kiln until the temperature is within 200 ℃, enabling the flue gas to flow to the tail part of the rotary kiln, collecting the flue gas by a smoke hood arranged at the tail part of the rotary kiln, and entering a dust removal and desulfurization step;
(4) Flue gas dust removal and desulfurization process: the smoke hood is arranged at the tail part of the rotary kiln through a flue, the smoke is firstly pumped to a bag-type dust remover to collect dust by using a dust removing fan, then enters a desulfurization facility to remove sulfur dioxide, and finally the smoke reaching the standard is discharged to the atmosphere;
(5) Hot pressing: the high Wen Feigang discharged from the head of the rotary kiln is fed into a hydraulic machine cylinder after passing through a distributor, then a hydraulic station is operated to press the high Wen Feigang into blocks, and finally the hot pressed blocks are conveyed to a hot pressed block storage bin; the specific gravity of the hot pressed block reaches 5.5t/m 3 The above; the carbon content in the obtained hot pressed block is 3-8%.
2. The hot-pressed scrap carburetion method according to claim 1, characterized in that: the material proportioning in the step (2) is specifically an electronic belt scale adopting a PLC automatic proportioning system.
3. The hot-pressed scrap carburetion method according to claim 1, characterized in that: and (5) conveying the adopted plate conveyor in the step (5).
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| US10808294B2 (en) * | 2018-08-20 | 2020-10-20 | Baha Elsayed Abulnaga | Triple chamber furnace for scrap segregation and melting |
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