CN116287522A - Metallized pellet for electric furnace and preparation process thereof - Google Patents
Metallized pellet for electric furnace and preparation process thereof Download PDFInfo
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- CN116287522A CN116287522A CN202310196532.6A CN202310196532A CN116287522A CN 116287522 A CN116287522 A CN 116287522A CN 202310196532 A CN202310196532 A CN 202310196532A CN 116287522 A CN116287522 A CN 116287522A
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- bamboo charcoal
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- 239000008188 pellet Substances 0.000 title claims abstract description 64
- 238000002360 preparation method Methods 0.000 title claims abstract description 9
- 239000002028 Biomass Substances 0.000 claims abstract description 90
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 89
- 239000003610 charcoal Substances 0.000 claims abstract description 65
- 235000017166 Bambusa arundinacea Nutrition 0.000 claims abstract description 56
- 235000017491 Bambusa tulda Nutrition 0.000 claims abstract description 56
- 241001330002 Bambuseae Species 0.000 claims abstract description 56
- 235000015334 Phyllostachys viridis Nutrition 0.000 claims abstract description 56
- 239000011425 bamboo Substances 0.000 claims abstract description 56
- 239000000843 powder Substances 0.000 claims abstract description 50
- 239000012141 concentrate Substances 0.000 claims abstract description 44
- 229910052742 iron Inorganic materials 0.000 claims abstract description 43
- 238000000197 pyrolysis Methods 0.000 claims abstract description 37
- 244000302661 Phyllostachys pubescens Species 0.000 claims abstract description 27
- 235000003570 Phyllostachys pubescens Nutrition 0.000 claims abstract description 27
- 239000007789 gas Substances 0.000 claims abstract description 27
- 239000002994 raw material Substances 0.000 claims abstract description 27
- 239000011230 binding agent Substances 0.000 claims abstract description 23
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 23
- 239000000428 dust Substances 0.000 claims abstract description 18
- 238000002309 gasification Methods 0.000 claims abstract description 18
- 229910052739 hydrogen Inorganic materials 0.000 claims abstract description 11
- 238000005516 engineering process Methods 0.000 claims abstract description 4
- 230000009467 reduction Effects 0.000 claims description 22
- 238000004519 manufacturing process Methods 0.000 claims description 15
- 229910052595 hematite Inorganic materials 0.000 claims description 11
- 239000011019 hematite Substances 0.000 claims description 11
- LIKBJVNGSGBSGK-UHFFFAOYSA-N iron(3+);oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[Fe+3].[Fe+3] LIKBJVNGSGBSGK-UHFFFAOYSA-N 0.000 claims description 11
- 238000002156 mixing Methods 0.000 claims description 10
- 230000003213 activating effect Effects 0.000 claims description 8
- SZVJSHCCFOBDDC-UHFFFAOYSA-N iron(II,III) oxide Inorganic materials O=[Fe]O[Fe]O[Fe]=O SZVJSHCCFOBDDC-UHFFFAOYSA-N 0.000 claims description 8
- 239000000203 mixture Substances 0.000 claims description 8
- 238000001035 drying Methods 0.000 claims description 7
- 229910052760 oxygen Inorganic materials 0.000 claims description 6
- 229910052710 silicon Inorganic materials 0.000 claims description 6
- 239000010703 silicon Substances 0.000 claims description 6
- 239000000440 bentonite Substances 0.000 claims description 5
- 229910000278 bentonite Inorganic materials 0.000 claims description 5
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 claims description 5
- 229910002091 carbon monoxide Inorganic materials 0.000 claims description 5
- 238000000227 grinding Methods 0.000 claims description 5
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 4
- 239000001301 oxygen Substances 0.000 claims description 4
- 239000002245 particle Substances 0.000 claims description 4
- 238000005453 pelletization Methods 0.000 claims description 4
- 239000002131 composite material Substances 0.000 claims description 3
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 claims description 2
- 239000000920 calcium hydroxide Substances 0.000 claims description 2
- 229910001861 calcium hydroxide Inorganic materials 0.000 claims description 2
- 238000010008 shearing Methods 0.000 claims 1
- 239000000463 material Substances 0.000 abstract description 31
- 229910052717 sulfur Inorganic materials 0.000 abstract description 18
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract description 14
- 239000000446 fuel Substances 0.000 abstract description 14
- 239000003638 chemical reducing agent Substances 0.000 abstract description 9
- 239000011593 sulfur Substances 0.000 abstract description 9
- 239000001257 hydrogen Substances 0.000 abstract description 8
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 abstract description 7
- 238000001465 metallisation Methods 0.000 abstract description 7
- 238000010438 heat treatment Methods 0.000 abstract description 4
- 229910004298 SiO 2 Inorganic materials 0.000 abstract description 3
- 229940095674 pellet product Drugs 0.000 abstract description 2
- 238000000034 method Methods 0.000 description 28
- 229910000831 Steel Inorganic materials 0.000 description 16
- 239000010959 steel Substances 0.000 description 16
- 235000021190 leftovers Nutrition 0.000 description 13
- 230000008569 process Effects 0.000 description 13
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 12
- 229910052751 metal Inorganic materials 0.000 description 10
- 239000002184 metal Substances 0.000 description 10
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 10
- 238000005245 sintering Methods 0.000 description 8
- 229910052757 nitrogen Inorganic materials 0.000 description 6
- 238000001238 wet grinding Methods 0.000 description 6
- 238000003723 Smelting Methods 0.000 description 5
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 5
- 239000003245 coal Substances 0.000 description 5
- 239000003345 natural gas Substances 0.000 description 5
- 239000002910 solid waste Substances 0.000 description 5
- 239000011701 zinc Substances 0.000 description 5
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 4
- 239000002817 coal dust Substances 0.000 description 4
- 229910052725 zinc Inorganic materials 0.000 description 4
- 239000002585 base Substances 0.000 description 3
- 230000004907 flux Effects 0.000 description 3
- 239000007787 solid Substances 0.000 description 3
- 239000004215 Carbon black (E152) Substances 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 2
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 2
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 description 2
- 240000008042 Zea mays Species 0.000 description 2
- 235000005824 Zea mays ssp. parviglumis Nutrition 0.000 description 2
- 235000002017 Zea mays subsp mays Nutrition 0.000 description 2
- 229910052783 alkali metal Inorganic materials 0.000 description 2
- 150000001340 alkali metals Chemical class 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 239000000571 coke Substances 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 235000005822 corn Nutrition 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000003546 flue gas Substances 0.000 description 2
- 229930195733 hydrocarbon Natural products 0.000 description 2
- 150000002430 hydrocarbons Chemical class 0.000 description 2
- 229910052500 inorganic mineral Inorganic materials 0.000 description 2
- 229920002521 macromolecule Polymers 0.000 description 2
- 239000011707 mineral Substances 0.000 description 2
- 239000011591 potassium Substances 0.000 description 2
- 229910052700 potassium Inorganic materials 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 239000011734 sodium Substances 0.000 description 2
- 229910052708 sodium Inorganic materials 0.000 description 2
- 238000005979 thermal decomposition reaction Methods 0.000 description 2
- 239000002023 wood Substances 0.000 description 2
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- 229920000742 Cotton Polymers 0.000 description 1
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 238000005054 agglomeration Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- RHZUVFJBSILHOK-UHFFFAOYSA-N anthracen-1-ylmethanolate Chemical compound C1=CC=C2C=C3C(C[O-])=CC=CC3=CC2=C1 RHZUVFJBSILHOK-UHFFFAOYSA-N 0.000 description 1
- 239000003830 anthracite Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 238000005261 decarburization Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 235000013399 edible fruits Nutrition 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000002737 fuel gas Substances 0.000 description 1
- 229910000464 lead oxide Inorganic materials 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 238000004137 mechanical activation Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 238000006386 neutralization reaction Methods 0.000 description 1
- 230000024121 nodulation Effects 0.000 description 1
- YEXPOXQUZXUXJW-UHFFFAOYSA-N oxolead Chemical compound [Pb]=O YEXPOXQUZXUXJW-UHFFFAOYSA-N 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- -1 potassium and sodium Chemical class 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 241000894007 species Species 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 239000010902 straw Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 238000009736 wetting Methods 0.000 description 1
- XLOMVQKBTHCTTD-UHFFFAOYSA-N zinc oxide Inorganic materials [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B13/00—Making spongy iron or liquid steel, by direct processes
- C21B13/08—Making spongy iron or liquid steel, by direct processes in rotary furnaces
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B13/00—Making spongy iron or liquid steel, by direct processes
- C21B13/0046—Making spongy iron or liquid steel, by direct processes making metallised agglomerates or iron oxide
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B13/00—Making spongy iron or liquid steel, by direct processes
- C21B13/0066—Preliminary conditioning of the solid carbonaceous reductant
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B13/00—Making spongy iron or liquid steel, by direct processes
- C21B13/10—Making spongy iron or liquid steel, by direct processes in hearth-type furnaces
- C21B13/105—Rotary hearth-type 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
-
- 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
-
- 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
- C22B1/242—Binding; Briquetting ; Granulating with binders
- C22B1/243—Binding; Briquetting ; Granulating with binders inorganic
-
- 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
- C22B1/242—Binding; Briquetting ; Granulating with binders
- C22B1/244—Binding; Briquetting ; Granulating with binders organic
-
- 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
- C22B13/00—Obtaining lead
- C22B13/02—Obtaining lead by dry processes
- C22B13/025—Recovery from waste materials
-
- 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
- C22B19/00—Obtaining zinc or zinc oxide
- C22B19/30—Obtaining zinc or zinc oxide from metallic residues or scraps
-
- 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
- C22B5/00—General methods of reducing to metals
- C22B5/02—Dry methods smelting of sulfides or formation of mattes
- C22B5/10—Dry methods smelting of sulfides or formation of mattes by solid carbonaceous reducing agents
-
- 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
- C22B5/00—General methods of reducing to metals
- C22B5/02—Dry methods smelting of sulfides or formation of mattes
- C22B5/16—Dry methods smelting of sulfides or formation of mattes with volatilisation or condensation of the metal being produced
-
- 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
-
- 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)
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- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Environmental & Geological Engineering (AREA)
- Inorganic Chemistry (AREA)
- Manufacture And Refinement Of Metals (AREA)
Abstract
The invention discloses a kind of electric stoveMetallized pellet and its preparation process, and belongs to the field of metallurgical technology. The raw materials of the metallized pellet comprise iron ore concentrate, electric furnace dust, biomass bamboo charcoal powder and binder, wherein the biomass bamboo charcoal powder is obtained by pyrolysis and gasification of moso bamboo or leftover materials thereof as biomass raw materials, the ash content is low, the sulfur content is low, the fixed carbon is high, the biomass bamboo charcoal powder is used as a reducing agent for preparing carbon-hydrogen-containing pellets, pyrolysis gas is used as a rotary hearth furnace or rotary kiln fuel for reducing and heating, the quality of the obtained metallized pellet is high, the cold compressive strength of the prepared metallized pellet product is more than 1500N/P, TFe in the product is more than or equal to 80%, the metallization rate is more than or equal to 85%, S is less than or equal to 0.05%, and SiO 2 ≤3.5％，C≤0.50％。
Description
Technical Field
The invention belongs to the field of metallurgy and comprehensive utilization, and particularly relates to a metallized pellet for an electric furnace and a preparation process thereof.
Background
The furnace burden of the electric furnace in China mainly comprises molten iron and scrap steel. The molten iron is produced by adopting a long flow of a blast furnace-a converter, the carbon emission is high, meanwhile, the carbon in the molten iron is higher, if the electric furnace is used for smelting the molten iron, the defects of long decarburization time and low efficiency exist, so the use proportion of the molten iron is limited and is generally not more than 50 percent. The method is a country with relatively lacking scrap steel, the quality of the scrap steel is unstable, and if some scrap steel contains harmful elements such as Cu, sn and the like, the scrap steel is difficult to remove in the electric furnace smelting process, and the quality of steel products is influenced. And because of the shortage of scrap steel, the price of scrap steel in China is too high, and adverse effect is brought to the steelmaking cost of an electric furnace. Therefore, the production of metal furnace burden capable of replacing scrap steel for electric furnaces has great demands in China.
The most widely used metal furnace burden for replacing electric furnace scrap at present is Direct Reduced Iron (DRI), which is a high-quality electric furnace burden with low harmful elements and high grade. However, the development of the direct reduced iron industry in China has been slow for a long time, and is mainly influenced by the shortage of natural gas in China, because more than 90% of direct reduced iron in the world is produced by a gas-based method using natural gas as a reducing agent raw material. The natural gas in China is deficient, and the development of the gas-based direct reduced iron is limited, so that the development is slow. However, in the large domestic background of carbon neutralization, the proportion of electric steel will increase year by year, and the demands for scrap steel and high-quality DRI are also increasing.
Through retrieval, patent CN105755195a discloses a method for directly preparing molten steel from high-silicon iron ore, which proposes a process route for treating high-silicon iron ore by using biomass charcoal as a direct reduction reducing agent and adopting FASTMELT process. The method comprises the following steps: firstly, preparing carbon-containing pellets by adopting proper biomass charcoal; secondly, directly reducing the mixture by a rotary hearth furnace under a proper reduction condition to obtain metallized pellets with extremely low carbon residue; and finally, the low-carbon and low-silicon molten steel is directly obtained from the low-carbon metallized pellets through high-temperature slag-iron separation. The biomass charcoal is mainly charcoal, but the charcoal has the problems of multiple varieties, unstable quality and the like, the charcoal has high sulfur content and high ash content, the ash content contains higher alkali metals such as potassium and sodium and the like, and the influence on the quality of molten steel is large, so that the feasibility of the patent is not strong.
Patent CN114517260a discloses a metallized pellet directly using biomass solid waste and a method for producing molten iron, the method provides a mixture of biomass solid waste and iron-containing raw materials, and the mixture is treated by flexible collocation of a double-base reduction shaft furnace and a melting furnace to obtain metallized pellets or molten iron products by using different kinds and grades of iron-containing raw materials, and the renewable energy source of biomass solid waste is fully utilized to reduce the iron-containing raw materials. The biomass solid waste adopted by the method mainly comprises corn stalks, cotton stalks, chaff, leaves, branches, roots, barks and the like, and is required to be processed into cylindrical particles with the length of 5-30mm and the length of 10-50mm in advance, and a double-base reduction shaft furnace is adopted to reduce iron-containing blocks. The biomass solid waste particles used in the patent have higher sulfur content and ash content, and the ash content contains higher alkali metals such as potassium and sodium, so that the caking and nodulation of the reduction shaft furnace are easy to cause, and the feasibility of the patent is not strong.
In addition, patent CN109207739a discloses a method for producing iron-making furnace burden by recycling zinc-containing metallurgical dust, which comprises the steps of mixing zinc-containing metallurgical dust with raw materials such as sintering fuel, magnesium-containing flux, calcium-containing flux and the like, and pelletizing; mixing and granulating the iron-containing raw materials with raw materials such as fuel, flux and the like; in the process of material distribution, firstly distributing a base material, then distributing the ball material on the base material, and then distributing the ball material; igniting and sintering after the cloth is finished; in the sintering process, when the ball material starts to burn, gas is blown to the surface of the sintering material until the sintering is finished, thus obtaining the sintering ore, and simultaneously, zinc is recovered from the sintering flue gas. The sintering fuel is at least one of coke powder, anthracite and biomass charcoal, and the main component of the fuel gas comprises at least one of natural gas, coke oven gas and biomass pyrolysis gas.
In the above patents, biomass is used for reducing iron ore, but the prepared biomass has high S content, high ash content and low C solid content, so that the grade of the metallized pellets is low.
Disclosure of Invention
1. Problems to be solved
Aiming at the problems of low grade of metallized pellets caused by high S content, high ash content and low C solid content of the existing biomass, the invention provides the metallized pellets for an electric furnace and the preparation process thereof.
2. Technical proposal
In order to solve the problems, the technical scheme adopted by the invention is as follows:
according to the metal furnace burden for the electric furnace, the moso bamboo or leftovers thereof which grow fast and grow early and have high yield are used as a biomass raw material pyrolysis gasification and electric furnace metal furnace burden coupling production mode, pyrolysis gas obtained by the pyrolysis gasification of the moso bamboo or leftovers thereof is used as a rotary hearth furnace or rotary kiln fuel for reducing and supplying heat, the obtained biomass bamboo charcoal powder is used as a reducing agent to replace fossil energy sources such as coal dust and the like to prepare the carbon-hydrogen-containing pellets, and the high-grade, low-sulfur green, low-carbon and high-quality metallized pellets are obtained after reduction.
The raw materials of the metallized pellet comprise iron ore concentrate, electric furnace dust, biomass bamboo charcoal powder and binder, and the mass ratio of the raw materials is as follows: (0-83.5), (0-80.0), (12.0-16.0) and (1.0-3.0).
The C/O ratio (the atomic number ratio of the fixed carbon in the internal pulverized coal to the oxygen in the iron oxide) in the mixed material after the iron concentrate, the electric furnace dust, the biomass bamboo charcoal powder and the binder are mixed is 0.7-1.3, so that the iron oxide in the mixed material can be fully reduced into metallic iron, the zinc and lead oxide in the mixed material can be reduced into zinc steam, and the lead steam escapes from the mixed material to the flue gas for collection and recovery.
Wherein TFe in the iron concentrate is more than or equal to 66%, siO 2 Less than or equal to 2.5 percent, and other harmful elements such as S, P and the like are less than 0.01 percent; the granularity is required to be less than 200 meshes and accounts for more than 85 percent. The iron concentrate comprises one or more of hematite concentrate and magnetite concentrate, and can be composed of 100% hematite concentrate, 100% magnetite concentrate, or mixture of hematite concentrate and magnetite concentrate in any proportion.
The charcoal bamboo charcoal powder takes moso bamboo as a biomass raw material, comprises moso bamboo or leftover materials thereof, and the preparation method comprises the following steps:
by adopting biomass pyrolysis gasification technology, the moso bamboo is sheared, self-dried and then enters a pyrolysis gasification furnace, and oxygen is limited (the discharging gas O is controlled) in the furnace by high temperature (600-800 ℃) 2 The content is 0.2% -0.3%) to make thermal decomposition reaction to decompose the biomass macromolecules into micromolecular pyrolysis gas and biomass bamboo charcoal powder.
C in the prepared biochar bamboo charcoal powder Fixing device More than or equal to 90 percent, S less than or equal to 0.20 percent, ash less than or equal to 5 percent, compared with the smokeless clean coal (C) Fixing device About 82.5%, S about 0.40%, ash about 10%), biomass charcoal (C Fixing device About 80%, S about 0.15% -0.30%, ash about 15% -20%) and biomass straw charcoal (C) Fixing device About 60 percent, about 0.30 to 0.70 percent of S and about 30 percent of ash, the biomass bamboo charcoal powder has obvious S content, ash content and C content Fixing device The method has the characteristics of high content, is very suitable for serving as a reducing agent, improves the iron grade of the metallized pellets, and reduces the S content, thereby greatly improving the quality of the metallized pellets.
The pyrolysis gas heat value obtained by pyrolysis and gasification of the biomass raw material is 5000-7000 kJ/m 3 The heat value of the pyrolysis gas is 1.5 to 2.0 times of that of the blast furnace gas, the pyrolysis gas of the heat value can be directly used as the fuel of a rotary hearth furnace or a rotary kiln burner, and the high heat value coke oven gas, converter gas or natural gas is not required to be added as the fuel of the burner, thereby reducing the production costThe method comprises the steps of carrying out a first treatment on the surface of the Wherein CH is 4 3.5％～4.5％、CO 2 17.5％～20.0％、CO 12.0％～14.0％、H 2 12.0％～13.5％、O 2 0.2 to 0.3 percent, and the fuel directly used as the fuel of the rotary hearth furnace or the rotary kiln burner is used for reducing and heating, thereby greatly reducing the production cost.
Furthermore, the biomass bamboo charcoal powder needs to be further finely ground to a granularity of less than 200 meshes and accounting for more than 95 percent, so that the biomass bamboo charcoal powder is favorable for preparing the carbon-hydrogen-containing pellets with the iron ore concentrate and improving the reaction dynamics condition.
The binder comprises one or more of bentonite, composite bentonite, calcium hydroxide, an organic binder and the like.
The preparation process of the metallized pellet specifically comprises the following steps:
step S1, activating: mechanically activating a high-pressure roller mill for the high-grade low-silicon iron concentrate;
step S2, batching and mixing: mixing the iron ore concentrate obtained in the step S2 with a certain proportion of electric furnace dust, biomass bamboo charcoal powder and binder, pelletizing by a disc pelletizer or pelletizing by a twin-roll pelletizer, and drying in a dryer;
step S3, reduction: the dried metallized pellets are directly reduced in a rotary hearth furnace or a rotary kiln, the metallized pellets obtained by reduction can directly enter an electric furnace for smelting in a thermal state, and the metallized pellets can also be used as furnace materials for replacing waste steel of the electric furnace after being cooled under the protection of nitrogen.
In the step S3, the reduction temperature of the rotary hearth furnace or the rotary kiln is 1150-1300 ℃ and the reduction time is 30-10 min.
The cold compressive strength of the prepared metallized pellet product is above 1500N/P, TFe of the product is more than or equal to 80%, metallization rate is more than or equal to 85%, S is less than or equal to 0.05%, siO 2 Less than or equal to 3.5 percent and C less than or equal to 0.50 percent, thereby meeting the use requirement of furnace burden of an electric furnace.
According to the invention, the fast-growing, early-forming and high-yield moso bamboo or leftover materials thereof are used as biomass raw material pyrolysis gasification and electric furnace metal furnace charge coupling production mode, pyrolysis gas obtained by the pyrolysis gasification of the moso bamboo or leftover materials thereof is used as rotary hearth furnace or rotary kiln fuel for reducing and supplying heat, the obtained biomass bamboo charcoal powder is used as a reducing agent to replace fossil energy sources such as coal dust and the like to prepare hydrocarbon-containing pellets, and the high-grade, low-sulfur, green, low-carbon and high-quality metallized pellets are obtained after reduction.
3. Advantageous effects
Compared with the prior art, the invention has the beneficial effects that:
(1) According to the invention, moso bamboo or leftover materials thereof are used as biomass raw materials for pyrolysis and gasification to obtain low ash content (less than or equal to 5%), low sulfur content (less than or equal to 0.2%), high fixed carbon biomass bamboo charcoal, fossil energy such as coal dust is replaced as a reducing agent, carbon-hydrogen-containing pellets are prepared and reduced in a rotary hearth furnace to obtain high-quality metallized pellets, cold compressive strength of the obtained metallized pellets is more than 1500N/P, TFe of the product is more than or equal to 80%, metallization rate is more than or equal to 85%, S is less than or equal to 0.05%, and SiO is obtained 2 ≤3.5％，C≤0.50％；
(2) The invention adopts the moso bamboo or the leftover materials thereof as biomass raw materials to obtain the biomass material with the calorific value of 5000-7000 kJ/m 3 The pyrolysis gas is used as the fuel of the rotary hearth furnace or the rotary kiln for reducing and supplying heat, biomass renewable energy is adopted in the whole production, no fossil energy is brought in, compared with the traditional process for directly reducing and producing metallized pellets by the rotary hearth furnace or the rotary kiln, the carbon emission reduction of each 1 ton of metallized pellets produced by the method is more than 70 percent, and if the rotary hearth furnace or the rotary kiln production system totally adopts green electricity, the zero carbon emission of the metallized pellets can be realized;
(3) The method adopts the moso bamboo or the leftover materials thereof as biomass raw materials, and has the advantages of quick growth, early wood formation, high yield and easy acquisition of raw materials.
Drawings
The technical solution of the present invention will be described in further detail below with reference to the accompanying drawings and examples, but it should be understood that these drawings are designed for the purpose of illustration only and thus are not limiting the scope of the present invention. Moreover, unless specifically indicated otherwise, the drawings are intended to conceptually illustrate the structural configurations described herein and are not necessarily drawn to scale.
FIG. 1 is a schematic diagram of a process flow for producing a green low-carbon metal charge for an electric furnace from biomass;
FIG. 2 shows a large amount of sawdust produced during moso bamboo processing;
FIG. 3 shows bamboo roots and bamboo tails produced by moso bamboo processing;
fig. 4 is a biomass bamboo charcoal powder obtained by pyrolysis of scraps in a moso bamboo processing process.
Detailed Description
The following detailed description of exemplary embodiments of the invention refers to the accompanying drawings, which form a part hereof, and in which are shown by way of illustration exemplary embodiments in which the invention may be practiced. While these exemplary embodiments are described in sufficient detail to enable those skilled in the art to practice the invention, it is to be understood that other embodiments may be realized and that various changes to the invention may be made without departing from the spirit and scope of the invention. The following more detailed description of the embodiments of the invention is not intended to limit the scope of the invention, as claimed, but is merely illustrative and not limiting of the invention's features and characteristics in order to set forth the best mode of carrying out the invention and to sufficiently enable those skilled in the art to practice the invention. Accordingly, the scope of the invention is limited only by the attached claims.
The invention develops a process for producing green low-carbon metal furnace burden for an electric furnace by using biomass, the produced product can directly meet the production requirement of the electric furnace, is used for partially replacing scrap steel for the electric furnace, and reduces carbon emission by more than 70 percent compared with the traditional process for producing metallized pellets by using a direct reduction method.
The present invention will be described in detail below:
the moso bamboo is produced in the provinces of Anhui, jiangxi, jiangsu, zhejiang and the like, for example, 45 ten thousand mu of bamboo forests exist in the Shao mountain county of Liuan, anhui province, and the moso bamboo has the characteristics of fast growth, early wood formation and high yield and is a renewable biomass raw material. The invention adopts a coupled production mode of pyrolysis gasification and electric furnace metal furnace burden by taking moso bamboo as biomass raw material. The pyrolysis combustible gas obtained by pyrolysis and gasification of moso bamboo is used as a rotary hearth furnace or a rotary kiln fuel for reducing and supplying heat, and the obtained biomass bamboo charcoal powder is used as a reducing agent to replace fossil energy such as coal dust and the like to prepare the green low-carbon high-quality metallized pellets with high grade and low sulfur by reduction of the hydrocarbon-containing pellets.
During moso bamboo processing, about 50% of the offcuts (sawdust, bamboo roots, bamboo tails, etc.) are produced, see fig. 2 and 3. From the standpoint of comprehensive utilization of resources and cost reduction, the leftover materials generated in the moso bamboo or processing process are used as biomass raw materials for pyrolysis and gasification to obtain combustible gas with higher heat value and biomass bamboo charcoal powder, and the preparation method is as follows:
by adopting biomass pyrolysis gasification technology, the moso bamboo is sheared, self-dried and then enters a pyrolysis gasification furnace, and oxygen is limited (the discharging gas O is controlled) in the furnace by high temperature (600-800 ℃) 2 The content is 0.2% -0.3%) to make thermal decomposition reaction to decompose the biomass macromolecules into micromolecular pyrolysis gas and biomass bamboo charcoal powder.
The pyrolysis combustible gas has the components and the heat values shown in the table 1, can directly meet the requirement of a rotary hearth furnace or a rotary kiln burner on the heat value of fuel, has higher use value, and can greatly reduce the production cost. The obtained biomass bamboo charcoal powder is shown in fig. 4, and the industrial analysis results and the calorific value of the bamboo charcoal powder are shown in table 2.
TABLE 1 Components and calorific value of Phyllostachys Pubescens and leftover materials biomass pyrolysis gas
TABLE 2 results and calorific value of industrial analysis of biomass bamboo charcoal powder by pyrolysis of moso bamboos and leftovers thereof
| Ash (%) | Volatile (%) | Sulfur (%) | Fixed carbon (%) | Heating value (MJ/kg) |
| 3.60 | 3.84 | 0.13 | 92.56 | 28.77 |
TABLE 3 comparison of biomass bamboo charcoal powder with smokeless clean coal and other Biomass charcoal related indicators
| Variety of species | Ash (%) | Volatile (%) | Sulfur (%) | Fixed carbon (%) | Heating value (MJ/kg) |
| Biomass bamboo charcoal powder | 3.60 | 3.84 | 0.13 | 92.56 | 28.77 |
| Mountain-western jin city smokeless clean coal | 10.24 | 7.62 | 0.41 | 82.15 | 28.16 |
| Biomass fruit charcoal | 20.38 | 4.81 | 0.17 | 74.81 | 23.90 |
| Biomass corn stalk charcoal | 33.77 | 8.03 | 0.27 | 58.20 | 21.05 |
Compared with smokeless clean coal and other biomass charcoal, the biomass bamboo charcoal powder obtained by pyrolysis of moso bamboo and leftover materials thereof has the characteristics of remarkable S-containing, ash-containing and C-solid-containing performances, and the comparison of related indexes is shown in Table 3. The biomass bamboo charcoal powder is very suitable for being used as a reducing agent to produce metallized pellets for an electric furnace, and can greatly improve the quality of the metallized pellets. The pyrolysis gas obtained by pyrolysis gasification has a heat value of 5000-7000 kJ/m 3 Is 1.5 to 2.0 times of the heat value of the blast furnace gas; wherein CH is 4 3.94% CO 2 19.62%, 12.62% CO and H 2 12.35% of O 2 0.27 percent, can be directly used as fuel of a rotary hearth furnace or a rotary kiln burner nozzle for reducing and supplying heat.
FIG. 1 is a schematic diagram of a process flow of a metal furnace burden for a green low-carbon electric furnace in biomass production, after a high-grade low-silicon iron concentrate enters a factory, the iron concentrate is firstly dried to 5% -8% by a cylinder dryer, then is subjected to mechanical activation treatment by a high-pressure roller mill, the surface morphology of the iron concentrate is changed under the pressure of the high-pressure roller mill, and a large number of cracks are generated on the surface of mineral powder particles, so that the specific surface area and sphericity of mineral powder are increased, the consumption of a binder is reduced, and the agglomeration strength is improved. Grinding the biomass bamboo charcoal to-200 meshes by adopting a grinder, and then conveying the biomass bamboo charcoal to a feeding bin by wind. In the process of batching, the iron ore concentrate after grinding, the finely ground biomass bamboo charcoal powder and the binder are proportioned according to a certain proportion, then a wetting mill is adopted for processing, and the processed mixture is pelletized or pressed by a disc pelletizer or a pair roller pelletizer. The pellets or pressed pellets are screened by a roller screen, qualified blocks enter a chain grate machine or a pellet dryer for drying, and return materials enter a moistening mill.
The drying temperature of the pressed mass is 100-350 ℃, the dried pressed mass is distributed into a rotary hearth furnace for roasting or a rotary kiln for roasting by a distributor, the pressed mass is reduced and roasted for 10-30 min at 1150-1300 ℃ in the rotary hearth furnace or the rotary kiln, and the obtained metallized furnace burden can be directly hot charged into an electric furnace for smelting without cooling, or can be directly charged into a storage bin or an automobile for transportation and then charged into the electric furnace for smelting after being cooled in a cooler with nitrogen protection.
The following examples of the invention are given to better illustrate the invention.
The hematite concentrate adopted in the embodiment is Brazil hematite concentrate, the magnetite concentrate is Ma Gangao mountain magnetite concentrate, the binder is composite bentonite, and the biomass bamboo charcoal powder is prepared by using moso bamboo and leftovers thereof as raw materials.
Example 1
79% of hematite concentrate (weight percentage, the same applies below), 5% of electric furnace dust, 14% of biomass bamboo charcoal powder and 2% of binder. The C/O ratio of the mixture of the iron ore concentrate, the electric furnace dust, the biomass bamboo charcoal powder and the binder is 1.10.
The method specifically comprises the following steps:
step S1, activating: the hematite concentrate is treated by a high-pressure roller mill in advance, and the biomass bamboo charcoal powder is finely ground;
step S2, batching and mixing: after being mixed according to the proportion, various materials are subjected to wet grinding treatment by a wet grinding machine and then are pelletized by a disc pelletizer, so as to obtain the carbon-hydrogen-containing pellets with the diameter of 8-16 mm;
step S3, reduction: the pellets are reduced for 20min at 1250 ℃ after being dried, and after being cooled under nitrogen protection, the obtained metallized pellets have average compressive strength of 1887.45N/P, metallization rate of 86.17%, grade of 85.63%, S content of 0.044% and SiO content 2 The content is 3.39%, and the content of C in the product is 0.41%.
Example 2
83.5% of hematite concentrate, 0% of electric furnace dust, 14.5% of biomass bamboo charcoal powder and 2% of binder. The C/O ratio of the mixture of the iron ore concentrate, the electric furnace dust, the biomass bamboo charcoal powder and the binder is 1.00.
The method specifically comprises the following steps:
step S1, activating: the hematite concentrate is treated by a high-pressure roller mill in advance, and the biomass bamboo charcoal powder is finely ground;
step S2, batching and mixing: after the materials are mixed according to the proportion, the materials are subjected to moistening and grinding treatment by a moistening and grinding machine, and ball pressing by a pair-roller ball pressing machine is adopted, so that the carbon-hydrogen-containing pellets with the diameter of 8-16 mm are obtained;
step S3, reduction: reducing at 1250 deg.c for 30min after drying, nitrogen protection and cooling to obtain metal pressed block with average compressive strength of 1940.90N/P, metallization rate of 87.03%, grade of 86.17%, S content of 0.046% and SiO 2 The content is 3.41 percent, and the content of C in the product is 0.36 percent.
Example 3
40% of hematite concentrate, 20% of magnetite concentrate, 24% of electric furnace dust, 14% of biomass bamboo charcoal powder and 2% of binder. The C/O ratio of the mixed material of the iron ore concentrate, the electric furnace dust, the biomass bamboo charcoal powder and the binder is 1.05.
The method specifically comprises the following steps:
step S1, activating: the iron ore concentrate is treated by a high-pressure roller mill in advance, and the biomass bamboo charcoal powder is finely ground;
step S2, batching and mixing: after being mixed according to the proportion, various materials are subjected to wet grinding treatment by a wet grinding machine and then are pelletized by a disc pelletizer, so as to obtain the carbon-hydrogen-containing pellets with the diameter of 8-16 mm;
step S3, reduction: the pellets are reduced for 25min at 1250 ℃ after being dried, and after being cooled under nitrogen protection, the obtained metallized pellets have the average compressive strength of 1905N/P, the metallization rate of 86.44 percent, the grade of 82.76 percent, the S content of 0.047 percent and the SiO content of 2 The content is 3.46%, and the content of C in the product is 0.40%.
Example 4
The magnetite concentrate is 20 percent, the electric furnace dust is 63 percent, the biomass bamboo charcoal powder is 15 percent, and the total consumption of the binder is 2 percent. The C/O ratio of the mixed material of the iron ore concentrate, the electric furnace dust, the biomass bamboo charcoal powder and the binder is 1.15.
The method specifically comprises the following steps:
step S1, activating: the iron ore concentrate is treated by a high-pressure roller mill in advance, and the biomass bamboo charcoal powder is finely ground;
step S2, batching and mixing: after being mixed according to the proportion, various materials are subjected to wet grinding treatment by a wet grinding machine and then are pelletized by a disc pelletizer, so as to obtain the carbon-hydrogen-containing pellets with the diameter of 8-16 mm;
step S3, reduction: the pellets are reduced for 25min at 1250 ℃ after being dried, and after being cooled under nitrogen protection, the obtained metallized pellets have average compressive strength of 1879N/P, metallization rate of 85.96 percent, grade of 81.21 percent, S content of 0.048 percent and SiO 2 The content is 3.50%, and the content of C in the product is 0.35%.
Claims (10)
1. The metallized pellet for the electric furnace is characterized in that the raw materials comprise biomass bamboo charcoal powder, wherein moso bamboos are used as biomass raw materials for the biomass bamboo charcoal powder, and C in the biomass bamboo charcoal powder Fixing device More than or equal to 90 percent, S less than or equal to 0.20 percent and ash less than or equal to 5 percent.
2. The metallized pellet for electric furnace according to claim 1, wherein the preparation method of the biomass bamboo charcoal powder comprises the following steps: adopts biomass pyrolysis gasification technology, and after shearing and self-drying, the moso bamboo is fed into a pyrolysis gasification furnace, and is discharged from the furnace at 600-800 DEG CO 2 The content is 0.2 to 0.3 percent, and the bamboo charcoal powder is decomposed into pyrolysis gas and biomass bamboo charcoal powder.
3. The metallized pellet for electric furnace according to claim 2, wherein the pyrolysis gas obtained by pyrolysis gasification of the biomass raw material has a calorific value of 5000-7000 kJ/m 3 Wherein CH is 4 3.5％～4.5％、CO 2 17.5％～20.0％、CO12.0％～14.0％、H 2 12.0％～13.5％、O 2 0.2％～0.3％。
4. The metallized pellet for electric furnace according to claim 3, wherein the raw materials of the metallized pellet further comprise iron ore concentrate, electric furnace dust and binder, and the mass ratio of the iron ore concentrate, the electric furnace dust, the biomass bamboo charcoal powder and the binder is (0-83.5), (0-80.0), (12.0-16.0) and (1.0-3.0).
5. The metallized pellet for electric furnace according to claim 4, wherein the C/O ratio of the mixture of the iron ore concentrate, the electric furnace dust, the biomass bamboo charcoal powder and the binder is 0.7-1.3.
6. The metallized pellet for electric furnace according to claim 5, wherein TFe is more than or equal to 66% and SiO in the iron ore concentrate 2 Less than or equal to 2.5 percent, S less than 0.01 percent, P less than 0.01 percent; the particle smaller than 200 meshes is more than or equal to 85 percent.
7. The metallized pellet for electric furnace according to claim 6, wherein the iron ore concentrate comprises one or more of hematite concentrate and magnetite concentrate, and the binder comprises one or more of bentonite, composite bentonite, calcium hydroxide, and organic binder.
8. The metallized pellet for electric furnace according to claim 7, wherein the cold compressive strength of the metallized pellet is more than 1500N/P, TFe is more than or equal to 80%, goldThe belonging rate is more than or equal to 85 percent, S is less than or equal to 0.05 percent, and SiO is less than or equal to 2 ≤3.5％，C≤0.50％。
9. A process for preparing metallized pellets for electric furnaces according to any one of claims 1 to 8, characterized in that it comprises in particular the following steps:
step S1, activating: activating the high-grade low-silicon iron concentrate by roller grinding;
step S2, batching and mixing: mixing the iron ore concentrate obtained in the step S2 with a certain proportion of electric furnace dust, biomass bamboo charcoal powder and binder, pelletizing by a disc pelletizer or a twin-roll pelletizer, and drying;
step S3, reduction: and directly reducing in a rotary hearth furnace or a rotary kiln after drying to obtain the metallized pellets.
10. The process for preparing metallized pellets for electric furnaces according to claim 9, characterized in that in step S3, the reduction temperature is 1150-1300 ℃, the reduction time is 30-10 min, and the oxygen content in the furnace is less than 2%.
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