CN101558170A - Arc furnace steelmaking process using palm shell charcoal - Google Patents
Arc furnace steelmaking process using palm shell charcoal Download PDFInfo
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- CN101558170A CN101558170A CNA2008800007094A CN200880000709A CN101558170A CN 101558170 A CN101558170 A CN 101558170A CN A2008800007094 A CNA2008800007094 A CN A2008800007094A CN 200880000709 A CN200880000709 A CN 200880000709A CN 101558170 A CN101558170 A CN 101558170A
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- charcoal
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- palm shell
- electric arc
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- 238000009628 steelmaking Methods 0.000 title claims abstract description 19
- 239000003610 charcoal Substances 0.000 title claims description 68
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 47
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 36
- 239000010959 steel Substances 0.000 claims abstract description 36
- 239000003575 carbonaceous material Substances 0.000 claims abstract description 26
- 229910052742 iron Inorganic materials 0.000 claims abstract description 24
- 235000013162 Cocos nucifera Nutrition 0.000 claims abstract description 13
- 244000060011 Cocos nucifera Species 0.000 claims abstract description 12
- 235000001950 Elaeis guineensis Nutrition 0.000 claims abstract description 11
- 239000000203 mixture Substances 0.000 claims abstract description 4
- 238000010891 electric arc Methods 0.000 claims description 30
- 238000003763 carbonization Methods 0.000 claims description 15
- 239000007921 spray Substances 0.000 claims description 15
- 241000512897 Elaeis Species 0.000 claims description 10
- 238000012856 packing Methods 0.000 claims description 7
- 238000002844 melting Methods 0.000 abstract description 3
- 230000008018 melting Effects 0.000 abstract description 3
- 240000003133 Elaeis guineensis Species 0.000 abstract 1
- 238000000197 pyrolysis Methods 0.000 abstract 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 22
- 239000002699 waste material Substances 0.000 description 21
- 239000000571 coke Substances 0.000 description 20
- 239000002893 slag Substances 0.000 description 20
- 229910052799 carbon Inorganic materials 0.000 description 14
- 238000003723 Smelting Methods 0.000 description 13
- 230000004927 fusion Effects 0.000 description 13
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 11
- 229910052760 oxygen Inorganic materials 0.000 description 11
- 239000001301 oxygen Substances 0.000 description 11
- 238000007670 refining Methods 0.000 description 11
- 239000007787 solid Substances 0.000 description 11
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 10
- 239000002994 raw material Substances 0.000 description 9
- 239000000446 fuel Substances 0.000 description 8
- 239000002028 Biomass Substances 0.000 description 7
- 238000005255 carburizing Methods 0.000 description 7
- 239000003795 chemical substances by application Substances 0.000 description 7
- 239000005431 greenhouse gas Substances 0.000 description 7
- 239000003245 coal Substances 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 6
- 239000007789 gas Substances 0.000 description 5
- 238000010438 heat treatment Methods 0.000 description 5
- 230000002829 reductive effect Effects 0.000 description 5
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 4
- 239000001569 carbon dioxide Substances 0.000 description 4
- 229910002092 carbon dioxide Inorganic materials 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N iron oxide Inorganic materials [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 238000010079 rubber tapping Methods 0.000 description 4
- 239000004449 solid propellant Substances 0.000 description 4
- NDLPOXTZKUMGOV-UHFFFAOYSA-N oxo(oxoferriooxy)iron hydrate Chemical compound O.O=[Fe]O[Fe]=O NDLPOXTZKUMGOV-UHFFFAOYSA-N 0.000 description 3
- 238000006722 reduction reaction Methods 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 description 2
- 235000012255 calcium oxide Nutrition 0.000 description 2
- 239000000292 calcium oxide Substances 0.000 description 2
- 235000011089 carbon dioxide Nutrition 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005485 electric heating Methods 0.000 description 2
- 239000010436 fluorite Substances 0.000 description 2
- 238000005187 foaming Methods 0.000 description 2
- 239000010439 graphite Substances 0.000 description 2
- 229910002804 graphite Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 238000010792 warming Methods 0.000 description 2
- 241000737241 Cocos Species 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 239000002956 ash Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000012159 carrier gas Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000007795 chemical reaction product Substances 0.000 description 1
- 239000011362 coarse particle Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 239000010881 fly ash Substances 0.000 description 1
- 150000002505 iron Chemical class 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000011068 loading method Methods 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 238000006386 neutralization reaction Methods 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 239000011819 refractory material Substances 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 239000002912 waste gas Substances 0.000 description 1
Images
Classifications
-
- 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
- C21C5/5211—Manufacture of steel in electric furnaces in an alternating current [AC] electric arc furnace
-
- 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
-
- 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
-
- 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
-
- 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
- C21C7/0025—Adding carbon material
-
- 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
- C21C7/0025—Adding carbon material
- C21C2007/0031—Adding carbon material being plastics, organic compounds, polymers
-
- 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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E50/00—Technologies for the production of fuel of non-fossil origin
- Y02E50/10—Biofuels, e.g. bio-diesel
-
- 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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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
- Treatment Of Steel In Its Molten State (AREA)
- Coke Industry (AREA)
Abstract
An arc furnace steelmaking process includes the steps of: feeding a mixture obtained by adding carbide obtained by dry distillation of coconut palm or oil palm shell and having a residual volatile content of 12% or more to iron scraps to an arc furnace; and producing molten steel by melting the iron scraps. It is preferred that a carbon material blown into the arc furnace from a lance has a residual volatile content less than 12%.
Description
Technical field
The present invention relates to a kind of with the arc furnace steelmaking process of scrap iron fusion with the production molten steel.More specifically, the present invention relates to a kind of arc furnace steelmaking process that uses auxiliary fuel or carburizing agent to produce molten steel.
Background technology
At the electric arc furnace that is used for making steel, will be as the fusion of the scrap iron of raw material and refining to produce steel products as material of construction etc.The main energy sources that is used for electric arc furnace is electric heating (arc heat).In order to quicken to fuse, also adopt auxiliary thermal source such as oxygen (oxidizing melting that is used for iron), geseous fuel or liquid fuel and coke powder with refining and in order to save expensive electric energy.At the modern electric arc furnace that is used for making steel, the energy input between electric heating and the auxiliary fuel is than reaching 50: 50.In auxiliary thermal source, have the solid fuel of high solid carbon content, be most important such as coke, as the hard coal and the oil coke of coke surrogate.These solid fuels are not only as thermal source, but also as reductive agent, thereby play crucial effect in self refining process.At present, iron per ton uses 20 to 30kg coke.
Yet, use such as coke and anthracitic a large amount of carbonaceous material, be derived from the great amount of carbon dioxide gas of fossil oil, promptly greenhouse gases are discharged in the atmosphere.For example, suppose that annual production is the steelworks of 1000000 tons standard scale, molten steel per ton uses the coke powder 25kg with carbonaceous amount content of 85%, only the carbonic acid gas of 77916 tons of annual dischargings of this steelworks.
As mentioned above, in steel-making course of the electric arc furnace, use carbonaceous material,, be discharged in the atmosphere as the carbon dioxide of Global warming gas (greenhouse gases) in a large number thus such as coke and hard coal as fossil oil.If use biomass charcoal such as charcoal to replace the carbonaceous material of being made up of fossil oil, then the greenhouse gas emission thing is reduced to zero in theory.Attention is called as " carbon neutralization " by the carbon dioxide that biomass fuel produces, and it is not included in the category of greenhouse gases (Global warming gas).
Summary of the invention
The purpose of this invention is to provide a kind of arc furnace steelmaking process, wherein, producing in the process of molten steel by the cold iron source of fusion and refining such as scrap iron in electric arc furnace, the biomass charcoal that physical attribute is similar to coke is used as the surrogate of coke, thereby can reduce the generation of a large amount of greenhouse gases.
In order to realize this purpose, the invention provides a kind of arc furnace steelmaking process, this method comprises the steps:
Charcoal is mixed with scrap iron in the electric arc furnace of packing into, and the carbonization of described charcoal by Exocarpium cocois (Cocos nucifera L) or oil palm shell obtains and has 12% or more residual volatile matter; And
Fuse this scrap iron to produce molten steel.
This step shell of packing into can comprise:
Charcoal and the carbonaceous material that is derived from fossil oil are packed in the electric arc furnace with scrap iron together with mixing, this charcoal by Exocarpium cocois (Cocos nucifera L) or oil palm shell the carbonization acquisition and have 12% or more residual volatile matter.
The charcoal that preferably further comprises the steps: the carbonization by Exocarpium cocois (Cocos nucifera L) or oil palm shell obtained according to arc furnace steelmaking process of the present invention and have less than 12% residual volatile matter is blown into the electric arc furnace from spray gun.
Description of drawings
Fig. 1 is the graphic representation that shows the relation between the productive rate of carbonization temperature/time and palm shell charcoal.
Fig. 2 is the graphic representation that shows the relation between productive rate and the residual volatile matter.
Fig. 3 shows the synoptic diagram of carrying out electric arc furnace of the present invention and showing the starting stage of waste material fusion.
Fig. 4 is the synoptic diagram of show carrying out electric arc furnace of the present invention and being presented at after the scrap melting state at once.
Fig. 5 shows to carry out electric arc furnace of the present invention and be presented at finishing the synoptic diagram that intensification is used for the refining period of molten steel afterwards.
Embodiment
In steel-making course of the electric arc furnace, use carbonaceous solid fuel, and the great amount of carbon dioxide that is derived from fossil oil is discharged into atmosphere.The formation greenhouse gases fall in the carbonic acid gas that is discharged.If use the biomass charcoal coke for replacing, then the greenhouse gas emission thing reduces to zero in theory.Yet, in a lot of situations, compare with coke, the solid carbon content of biomass charcoal is low, and and biomass charcoal because its low-down bulk density is disperseed easily, these all are problems.Therefore, in steel-making course of the electric arc furnace, biomass charcoal is not used as solid fuel.
In Malaysia and Indonesia, coconut or oil palm industry are one of the staple industries.The a large amount of palm hull that generated stand carbonization and produce charcoal.Hereinafter, the charcoal that will obtain by the carbonization of Exocarpium cocois (Cocos nucifera L) or oil palm shell is called " palm shell charcoal ".The Exocarpium cocois (Cocos nucifera L) charcoal has than the low slightly bulk density of the bulk density of coke and has high solid carbon content, and therefore using palm shell charcoal is very possible as the surrogate such as the fossil oil of coke.Table 1 has shown the comparison of the physical attribute between oil palm shell charcoal and the coke.
Table 1
Be apparent that from table 1, compare that palm shell charcoal has high heating value, low ash content and low sulfur content, and thereby has been fuel with coke.Yet at present, the application of palm shell charcoal is limited to the raw material as activated carbon substantially, and its industrial scale is little.And along with the rapid rising of recent fossil oil price, palm hull is day by day as the fuel transaction more expensive than coal.Thus, electric steel manufacturers is not in and continues to use in the situation of palm hull.In Indonesia and Malaysia, the price of coke or alternative fossil oil is 180 to 200 dollars/ton, and the price of palm hull is 40 dollars/ton, and the price of palm shell charcoal is 250 to 270 dollars/ton.Therefore, electric steel manufacturers does not use palm shell charcoal constantly.
At present in steel-making course of the electric arc furnace in widely used coke, hard coal, the oil coke etc., Gu carbon content is more than 85%, and volatile matter is below 8%.For the solid carbon content with palm shell charcoal is increased to more than 85% and the volatile matter of palm shell charcoal is reduced to below 8%, must increase carbonization temperature and increase carbonization time at the production period of palm shell charcoal, and productive rate reduces.This productive rate is the value that the weight of the palm shell charcoal that produces by using obtains divided by the weight of required palm hull.Be used for the situation of the palm shell charcoal of the raw material production of activated carbon in conduct at present, productive rate is about 22% to 25%.As mentioned above, the present price of palm shell charcoal is 250 to 270 dollars/ton, and this depends primarily on the price of palm hull.Table 2 has shown the example of producing and loading and transporting the price mechanism of 1 ton of palm shell charcoal.
Table 2
| Project | Price (dollar) | Remarks |
| The palm hull raw materials cost | 160 | Be 40 dollars * 4 under 25% productive rate |
| |
30 | |
| |
7 | |
| |
10 | |
| Packing/transportation | 16 | |
| The FOB expense | 22 | In Malaysia's outlet shipment |
| Cost/profit | 15 | |
| Amount to | 260 |
Be apparent that from last table if reduce productive rate by the level that volatile matter is reduced at present as the palm shell charcoal of commerical prod distribution, then the per-cent of raw materials cost is increased to 61.5%, and lose the white war with fossil oil.As mentioned above, the price of fossil oil is 180 to 200 dollars/ton at present.
In the present invention, allow the volatile matter in the palm shell charcoal is remained on the level that can use at the electric furnace that is used for making steel, and by improving productive rate, the economical efficiency of alternative palm shell charcoal increases.For example, under 35% productive rate, raw materials cost is 114 dollars, and the price of palm shell charcoal is 214 dollars/ton.Under 45% productive rate, raw materials cost is 89 dollars, and the price of palm shell charcoal is 189 dollars/ton.Thereby, can guarantee competitiveness with fossil oil.
In order to improve productive rate, in the production process of palm shell charcoal, reduce carbonization temperature and reduce carbonization time.Fig. 1 has shown the relation between the productive rate of carbonization temperature/time and palm charcoal.Fig. 2 has shown the relation between productive rate and the residual volatile matter.
In the present invention, in the production process of palm shell charcoal, productive rate is improved, and produces the palm shell charcoal with high residue volatile matter (more than 12%).When in electric furnace, using this palm shell charcoal, will before fusion, pack in the smelting furnace with the coarse particles of waste material blended palm shell charcoal.Volatile matter burns and is used as thermal source when waste material fuses, and remaining solid carbon content is as carburizing agent.To can all form with waste material blended carbonaceous material, perhaps can be partly form by palm shell charcoal and the material that partly uses by tradition with low volatile and high solid carbon content by palm shell charcoal.Reported if will have the carbonaceous material of high volatile matter and be blown in molten steel or the slag, then in slag foaming or the slag reduction of ferric oxide may be subjected to influencing unfriendly (Denki-Seiko[Electric Furnace Steel], Vol.56, No.1 (in January, 1985), " Reduction of FeO in molten slag by solid carbon ").Thus, as in the conventional cases, it is desirable to use material as the carbonaceous material that will be blown in the smelting furnace with low volatile and high solid carbon content.
Now will be to using palm shell charcoal to be described in the arc furnace steelmaking process of producing molten steel scrap iron fusion and refining as the detailed process of coke surrogate.Fig. 3 is to show the synoptic diagram of carrying out state of the present invention in electric arc furnace when cold iron source fuses to Fig. 5.Fig. 3 shows the starting stage of the fusion of cold iron source, and Fig. 4 is presented at after the fusing of cold iron source state at once, and Fig. 5 is presented at the stage in latter stage of steel-making course of the electric arc furnace and finishes the refining period that is used for molten steel after heating up.
To Fig. 5, the water-cooled smelting furnace sidewall 3 that is made of metal is arranged on the upside in the periphery of the body of heater 2 that comprises outer box hat and refractorily lined with reference to Fig. 3, and the upper shed of smelting furnace sidewall 3 is coated with can open and the furnace roof 4 water-cooled that is made of metal.Three Graphite Electrodess 5 are set to pass furnace roof 4 and move up and down in the body of heater 2.Each of Graphite Electrodes 5 is connected to the three-phase alternating-current supply (not shown), and between electrode 5 and the material in electrode 5 and the smelting furnace of packing into, such as producing electric arc 12 between cold iron source 9 and the molten steel 10.
The spray gun 7 that is used for being blown into the spray gun 6 of oxygen and is used to be blown into carbonaceous material is set to pass smelting furnace sidewall 3 and moves up and down body of heater 2.Oxygen is blown into body of heater 2 from the spray gun 6 that is used for being blown into oxygen, and at air, nitrogen etc. as under the situation of carrier gases, carbonaceous material is blown into body of heater 2 from the spray gun 7 that is used for being blown into carbonaceous material.Pipeline 8 is arranged on the furnace roof 4, and the high-temp waste gas that generates in the smelting furnace uses the emptying of fly-ash separator (not shown) by pipeline 8.The tap hole (not shown) also is arranged in the body of heater 2.
At first, the charcoal 20 that waste material 9 and the carbonization by Exocarpium cocois (Cocos nucifera L) charcoal or oil palm shell charcoal is obtained and have a residual volatile matter more than 12% is from the feeding funnel (not shown) that gets off from suspentions such as lifting machines is packed electric arc furnace 1 into, the furnace roof 4 of electric arc furnace is opened, (being called as " raw material filling phase " this period).Next, furnace roof 4 closed and electrode 5 inserted in the smelting furnaces, electrode 5 each with waste material 9 between produce electric arc 12, and waste material 9 by the arc heat that is produced fusion to produce molten steel 10 (being called as " waste material fuses the phase " this period).Pack that residual volatile matter in the charcoal in the smelting furnace burns into and as thermal source during fusing with waste material, and the solid carbon of residue is as carburizing agent.When producing molten steel 10, will pack in the smelting furnace on molten steel 10, forming slag 11 such as the fusing assistant of unslaked lime or fluorite usually, thereby prevent that molten steel 10 is oxidized, and keep the temperature of molten steel 10.When all waste material 9 fusings in the smelting furnace of packing into, the molten steel 10 that is produced is heated to preset temperature (being called as " temperature raising period " this period) by arc heat.After temperature was elevated to predeterminated level, molten steel 10 stood composition and regulates (being called as " refining period " this period).Then, molten steel 10 is discharged into the molten steel carrying container by tap hole, and after tapping, as required, slag 11 is entered in the slag ladle etc. (being called as " tapping/deslagging phase " this period).That is to say that a circulation is loaded phase, cold iron source fusion phase, temperature raising period, refining period and tapping/deslagging phase by raw material and formed.Therefore, produce molten steel 10 from waste material 9.
In the present invention, in each of waste material fusion phase, temperature raising period and refining period, can be used as auxiliary fuel or carburizing agent as the palm shell charcoal of coke surrogate.
Interim in waste material fusion, electrode 5 each with waste material 9 between produce electric arc 12, and waste material 9 by the arc heat that is produced fusion with generation molten steel 10.Residual volatile matter in the charcoal 20 burns during fusing and as thermal source, is used as thermal source and carburizing agent and remain solid carbon.As shown in Figure 3, in order successfully to melt waste material 9, oxygen is blown into and the carbonaceous material that will have low volatile and a high solid carbon content is blown into towards the waste material 9 that is deposited on smelting furnace from the spray gun 7 that is used to be blown into carbonaceous material from the spray gun 6 that is used for being blown into oxygen.Waste material 9 is by partly oxidation and by heat of oxidation heating and fusion of the oxygen that is blown into.
In temperature raising period, owing to sedimentary waste material 9 melts fully, so high-temperature electric arc 12 exposes the sidewall refractory materials that this may cause big thermosteresis and damage body of heater 2.Therefore, in the present invention, when fusing interim generation molten steel 10 at cold iron source, will pack in the smelting furnace forming slag 11 such as the fusing assistant of unslaked lime or fluorite, thereby prevent that molten steel 10 is oxidized, and keep the temperature of molten steel 10.In temperature raising period, as shown in Figure 4, each the end that is used for being blown into the spray gun 6 of oxygen and is used to be blown into the spray gun 7 of carbonaceous material immerses slag 11, and oxygen is blown into from the spray gun 6 that is used for being blown into oxygen and carbonaceous material is blown into slag 11 from the spray gun 7 that is used to be blown into carbonaceous material.The carbonaceous material that has been blown into and has been suspended in the slag 11 produces the combustion heat with the oxygen reaction that has been blown into, and this combustion heat is as auxiliary thermal source, thus saving power consumption.Simultaneously owing to slag 11 is bubbled as the CO gas of reaction product, so electric arc 12 covered by blistered slag 11, thereby improved the heat transfer efficiencies of electric arc 12.Slag 11 blistered phenomenons are called as " foaming of slag ".
In refining period, as shown in Figure 5, carbonaceous material is blown into slag 11 from the spray gun 7 that is used for being blown into carbonaceous material.Thus, the ferric oxide in the slag is reduced and forms iron, and this iron is added to molten steel 10.In addition because the CO gas that generates bubbles in the reduction reaction of slag 11 by the ferric oxide in slag, so electric arc 12 covered by blistered slag 11, thereby as in the temperature raising period, having improved the heat transfer efficiencies of electric arc 12.In addition, when with carbonaceous material when acting on the carburizing agent that composition regulates, the end that will be used for being blown into the spray gun 7 of carbonaceous material immerses molten steel 10, and carbonaceous material is blown in the molten steel.
Example
In Indonesian Electric furnace steel making factory the use of palm shell charcoal with high volatile matter is tested.Table 3 has shown the physical attribute of the palm shell charcoal that uses in this test.Since the volatile matter of palm shell charcoal 48.1% time very high, based on security consideration, use palm shell charcoal in 50% the amount of the total carbonaceous material in being mixed into waste material, and use hard coal (volatile matter 2%) for remaining 50%.Thereby, the volatile matter that is mixed into the carbonaceous material in the waste material is calculated 25%.Table 4 has shown the summary of test result.
Table 3
Table 4
Charcoal A in the table 4 is corresponding to the palm shell charcoal in the table 1, and the B in the table 4 is corresponding to the palm shell charcoal that has high volatile matter in the table 3.In heating No.7 and 8, use charcoal B to mix with hard coal.Tap to tap time (1 required time of heating: minute) and power consumption speed have shown that the assessment of electric furnace performance is based on described tap to tap time and power consumption speed than better value in the situation of use coke.This is because high volatile matter is used as effective thermal source.Carbon content during tapping in the molten steel (%) can influence the carburizing effect sharply.
Claims (4)
1. an arc furnace steelmaking process that uses palm shell charcoal comprises the steps:
Charcoal is mixed with scrap iron in the electric arc furnace of packing into, and the carbonization of described charcoal by Exocarpium cocois (Cocos nucifera L) or oil palm shell obtains and has 12% or more residual volatile matter; And
Fuse described scrap iron to produce molten steel.
2. arc furnace steelmaking process according to claim 1, wherein the step that charcoal is mixed with scrap iron in the described electric arc furnace of packing into comprises:
Will the carbonization by Exocarpium cocois (Cocos nucifera L) or oil palm shell obtain and have 12% or the charcoal of more residual volatile matter and the carbonaceous material that is derived from fossil oil mix with scrap iron together and pack into.
3. the arc furnace steelmaking process of use Exocarpium cocois (Cocos nucifera L) charcoal according to claim 1 further comprises the steps: the carbonization by Exocarpium cocois (Cocos nucifera L) or oil palm shell obtained and the charcoal that has less than 12% residual volatile matter is blown into the described electric arc furnace from spray gun.
4. the arc furnace steelmaking process of use Exocarpium cocois (Cocos nucifera L) charcoal according to claim 1 comprises the steps: that further the carbonaceous material that will have low volatile is blown into the described electric arc furnace from spray gun.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/JP2008/056733 WO2009047927A1 (en) | 2008-03-28 | 2008-03-28 | Arc furnace steelmaking process using palm shell charcoal |
Publications (2)
| Publication Number | Publication Date |
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| CN101558170A true CN101558170A (en) | 2009-10-14 |
| CN101558170B CN101558170B (en) | 2012-12-26 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2008800007094A Expired - Fee Related CN101558170B (en) | 2008-03-28 | 2008-03-28 | Arc furnace steelmaking process using palm shell charcoal |
Country Status (4)
| Country | Link |
|---|---|
| JP (1) | JP5042308B2 (en) |
| KR (1) | KR101341758B1 (en) |
| CN (1) | CN101558170B (en) |
| WO (1) | WO2009047927A1 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102959059A (en) * | 2010-08-17 | 2013-03-06 | 宇部兴产株式会社 | Solid fuel, and method and apparatus for producing same |
| CN103160630A (en) * | 2013-02-20 | 2013-06-19 | 罕王实业集团有限公司 | Laterite nickel ore smelting method using palm shell to replace part of coke |
| CN113355474A (en) * | 2021-05-25 | 2021-09-07 | 江阴市尚疯新能源技术开发有限公司 | Method for neutralizing iron carbon in steel making by using iron ore, hydrogen and oxygen |
| CN115478127A (en) * | 2022-09-21 | 2022-12-16 | 北京力科华越新材料科技有限公司 | Biomass foaming agent, preparation method thereof and application thereof in submerged arc steelmaking of foamed slag of electric arc furnace |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5581760B2 (en) * | 2010-03-19 | 2014-09-03 | Ｊｆｅスチール株式会社 | Method for removing copper in steel scrap and method for producing molten steel using steel scrap as an iron source |
| JP5998763B2 (en) * | 2011-09-28 | 2016-09-28 | Ｊｆｅスチール株式会社 | Converter steelmaking method |
| JP5942425B2 (en) * | 2011-12-28 | 2016-06-29 | Ｊｆｅスチール株式会社 | Method for producing high-carbon molten iron using iron scrap |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS52120923A (en) * | 1976-04-05 | 1977-10-11 | Nittetsu Kinzoku Kogyo Kk | Flux for casting extremely soft rimmed steel |
| JP2000008115A (en) * | 1998-06-19 | 2000-01-11 | Nkk Corp | Melting of cold iron source |
| JP2001026810A (en) * | 1999-07-14 | 2001-01-30 | Daido Steel Co Ltd | Operation of electric furnace |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009046726A (en) * | 2007-08-20 | 2009-03-05 | Jp Steel Plantech Co | Steelmaking method in arc furnace |
-
2008
- 2008-03-28 KR KR1020097004943A patent/KR101341758B1/en active IP Right Grant
- 2008-03-28 JP JP2009506844A patent/JP5042308B2/en active Active
- 2008-03-28 WO PCT/JP2008/056733 patent/WO2009047927A1/en active Application Filing
- 2008-03-28 CN CN2008800007094A patent/CN101558170B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS52120923A (en) * | 1976-04-05 | 1977-10-11 | Nittetsu Kinzoku Kogyo Kk | Flux for casting extremely soft rimmed steel |
| JP2000008115A (en) * | 1998-06-19 | 2000-01-11 | Nkk Corp | Melting of cold iron source |
| JP2001026810A (en) * | 1999-07-14 | 2001-01-30 | Daido Steel Co Ltd | Operation of electric furnace |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102959059A (en) * | 2010-08-17 | 2013-03-06 | 宇部兴产株式会社 | Solid fuel, and method and apparatus for producing same |
| CN102959059B (en) * | 2010-08-17 | 2015-11-25 | 宇部兴产株式会社 | Solid fuel and manufacture method, manufacturing installation |
| CN103160630A (en) * | 2013-02-20 | 2013-06-19 | 罕王实业集团有限公司 | Laterite nickel ore smelting method using palm shell to replace part of coke |
| CN113355474A (en) * | 2021-05-25 | 2021-09-07 | 江阴市尚疯新能源技术开发有限公司 | Method for neutralizing iron carbon in steel making by using iron ore, hydrogen and oxygen |
| CN115478127A (en) * | 2022-09-21 | 2022-12-16 | 北京力科华越新材料科技有限公司 | Biomass foaming agent, preparation method thereof and application thereof in submerged arc steelmaking of foamed slag of electric arc furnace |
| CN115478127B (en) * | 2022-09-21 | 2024-01-09 | 北京力科华越新材料科技有限公司 | Biomass foaming agent, preparation method thereof and application thereof in arc furnace foam slag submerged arc steelmaking |
Also Published As
| Publication number | Publication date |
|---|---|
| KR20100126171A (en) | 2010-12-01 |
| KR101341758B1 (en) | 2013-12-16 |
| JP5042308B2 (en) | 2012-10-03 |
| WO2009047927A1 (en) | 2009-04-16 |
| CN101558170B (en) | 2012-12-26 |
| JPWO2009047927A1 (en) | 2011-02-17 |
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