WO2011158338A1 - 生ペレット - Google Patents
生ペレット Download PDFInfo
- Publication number
- WO2011158338A1 WO2011158338A1 PCT/JP2010/060159 JP2010060159W WO2011158338A1 WO 2011158338 A1 WO2011158338 A1 WO 2011158338A1 JP 2010060159 W JP2010060159 W JP 2010060159W WO 2011158338 A1 WO2011158338 A1 WO 2011158338A1
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- WO
- WIPO (PCT)
- Prior art keywords
- inner core
- layer
- core layer
- raw
- inorganic compound
- Prior art date
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Classifications
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
- C10L5/00—Solid fuels
- C10L5/02—Solid fuels such as briquettes consisting mainly of carbonaceous materials of mineral or non-mineral origin
- C10L5/26—After-treatment of the shaped fuels, e.g. briquettes
- C10L5/32—Coating
-
- 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
- C22B1/244—Binding; Briquetting ; Granulating with binders organic
- C22B1/245—Binding; Briquetting ; Granulating with binders organic with carbonaceous material for the production of coked agglomerates
Definitions
- the present invention relates to raw pellets in which an iron oxide-containing raw material, a reducing carbon material, and a slagging agent are mixed and granulated, and then coated with a combustion carbon material, and in particular, an oxygen-containing gas is passed through the packed bed and heated. It is related with the raw pellet used in the partial reduction furnace reduced by this.
- Patent Document 1 As a conventional raw pellet, as described in the following Patent Document 1 proposed in the production of partially reduced iron using a sintering machine, powdered iron ore, carbonaceous material and lime-based auxiliary material are mixed.
- a coating layer 122 containing at least 25% by weight of CaO is provided on the surface of a granule 121 obtained by mixing a powdered iron raw material and a powdered solid reducing agent. (See FIG. 3B).
- the lime-based auxiliary material of the inner core layer 111 is carbon.
- a calcium ferrite-based melt is generated, and a part of the iron ore of the first coating layer 112 is leached so that a part of the melt is absorbed by the powdered iron ore of the first coating layer 112.
- the molten iron ore of the first coating layer 112 is fired and a dense solidified layer is formed surrounding the inner core layer 111 after firing, the partially reduced iron reacts with oxygen in the air.
- the pellet can be prevented from being reoxidized.
- the CaO of the coating layer 122 when supplied to the partial reduction furnace, the CaO of the coating layer 122 functions as a flux that generates a low melting point compound and reacts with iron. By forming the melt layer, it is possible to obtain pellets that prevent reoxidation by blocking the contact between iron and supply air.
- the powdered lime and the powdered iron oxide come into contact with each other to cause a melting reaction to form a coating film. If a non-contact portion where the lime and the powdered iron oxide are not in contact is formed, a coating film cannot be formed on the non-contact portion, and a void is formed, so that reoxidation is stable. It will be difficult to suppress.
- the raw pellets 110 and 120 are in an overmelted state. As a result, there is a problem that the shape collapses, the air permeability is impaired, and the reduction reaction is hindered.
- an object of the present invention is to provide a raw pellet that can be easily made into a pellet in which reoxidation is stably suppressed without increasing the firing temperature.
- the raw pellet according to the first invention for solving the above-described problem is to surround an inner core layer containing an iron oxide-containing raw material, a reducing carbonaceous material, and a fouling agent, and a surface of the inner core layer.
- a raw pellet comprising a coating layer provided on the surface, wherein the coating layer contains an inorganic compound having a melting point of 750 ° C. or higher and lower than 1100 ° C. and a combustion carbonaceous material. It is characterized by.
- the raw pellet according to the second invention is characterized in that, in the first invention, the inorganic compound of the coating layer contains an alkali metal oxide.
- the raw pellet according to a third aspect of the present invention is the raw pellet according to the second aspect, wherein the coating layer contains 0.15 to 1.5% by weight of the alkali metal oxide in a ratio to the weight of the inner core layer. It has the said inorganic compound, It is characterized by the above-mentioned.
- the raw pellet according to a fourth invention is the protection according to any one of the first to third inventions, wherein the coating layer contains the inorganic compound provided so as to surround the surface of the inner core layer. And a combustion layer containing the combustion carbon material provided so as to surround the surface of the protective layer.
- the inorganic compound in the coating layer melts itself to form a melt and covers the surface of the inner core layer in a low temperature range where the inorganic compound in the coating layer does not react with the constituent particles of the inner core layer.
- the inner core layer is surely covered with a melt film without voids in the above temperature region, so that the reoxidation is stably suppressed without increasing the firing temperature. Can be easily done.
- the raw pellet according to the present embodiment is provided so as to surround the inner core layer 11 containing the iron oxide-containing raw material, the reducing carbonaceous material, and the slagging agent, and the surface of the inner core layer 11.
- a raw pellet 10 comprising a coating layer 12, wherein the coating layer 12 is provided so as to surround the surface of the inner core layer 11 and contains an inorganic compound having a melting point of 750 ° C. or more and less than 1100 ° C. It consists of a protective layer 12a and a combustion layer 12b which is provided so as to surround the surface of the protective layer 12a and contains a combustion carbon material.
- iron oxide-containing raw material of the inner core layer 11 examples include iron ore and ironworks generated dust (sintering machine generated dust, blast furnace generated dust, converter generated dust, rolling factory generated sludge, etc.) and the like.
- carbon material examples include coal, coke, char, oil coke, and the like
- slagging agent examples include lime-based materials such as limestone, smelting slag, cement, slaked lime, quicklime, dolomite, and calcined dolomite.
- combustion carbonaceous material of the combustion layer 12b examples include the same materials as the reducing carbonaceous material of the inner core layer 11.
- Such raw pellets 10 include, for example, the powder of the iron oxide-containing raw material (for example, average diameter: about 30 to 50 ⁇ m, ratio: about 75% by weight) and the reducing carbon material.
- Powder for example, average diameter: about 30 to 50 ⁇ m, ratio: about 20% by weight
- powder of the above-mentioned anti-molding agent for example, average diameter: about 30 to 50 ⁇ m, ratio: about 5% by weight
- the layer 11 is charged into a mixer such as a mixer, and the inorganic compound powder (for example, average diameter: about 30 to 50 ⁇ m) is charged (for example, about 1 to 10% by weight with respect to the inner core layer 11).
- the protective layer 12 a is coated on the surface of the inner core layer 11. Then, the combustion carbonaceous material powder (for example, average diameter: about 30 to 50 ⁇ m) is added (for example, about 5% by weight with respect to the inner core layer 11), and a binder (if necessary) If the surface of the protective layer 12a is coated with the combustion layer 12b and the coating layer 12 is provided, it can be easily manufactured by taking it out of the mixer and drying it.
- the combustion carbonaceous material powder for example, average diameter: about 30 to 50 ⁇ m
- a binder if necessary
- the combustion layer 12b of the coating layer 12 is burned by supplying it to a packed bed partial reduction furnace such as a sintering machine, the combustion As the temperature rises due to (750 ° C. or higher and lower than 1100 ° C.), the inorganic compound of the protective layer 12a melts alone to form a melt, covering the entire surface of the inner core layer 11 without generating voids. Then, it enters into fine pores generated on the surface of the inner core layer 11 to close the pores.
- the iron oxide in the inner core layer 11 is reduced by the carbon in the inner core layer 11, and a melt is locally generated by the slagging agent to generate pellets. Shrinks and the number of pores into which oxygen enters is reduced.
- the melt follows the change, covers the entire surface of the inner core layer 11 without generating voids, and enters the pores to close the pores.
- the inner core layer 11 is not in direct contact with the outside air, and reoxidation in a high temperature region after reduction is prevented.
- the protective layer 12a solidifies from the molten state and forms a shell, thereby shielding the inner core layer 11.
- the raw pellet 10 according to the present embodiment has a temperature region (750 ° C. or higher) where the oxidation rate of the inorganic compound in the protective layer 12a is high (less than 1100 ° C.) before the reduction occurs in the inner core layer 11 (less than 1100 ° C.). It melts itself to form a melt and covers the surface of the inner core layer 11.
- the entire inner surface of the inner core layer 11 is surely covered with a melt film having no voids in the temperature range (750 ° C. or higher and lower than 1100 ° C.).
- the raw pellet 10 according to the present embodiment it is possible to easily obtain a pellet in which reoxidation is stably suppressed without increasing the firing temperature (above 1300 ° C.).
- the inorganic compound of the protective layer 12a may be an oxide such as CaO or SiO 2 that exists and contacts the surface of the inner core layer 11 at the reduction sintering temperature (1100 to 1300 ° C.) of the inner core layer 11. Since the reaction causes the oxide to melt and further generate a melt, the amount of the melt covering the surface of the inner core layer 11 can be increased. For this reason, even if there is little quantity of the said inorganic compound of the said protective layer 12a, since sufficient thickness can be formed, the reduction of material cost can be aimed at.
- the protective layer 12a of the covering layer 12 contains the alkali metal oxide in an amount of 0.15 to 1.5% by weight with respect to the weight of the inner core layer 11 with respect to the inner core layer 11. It is preferably composed of an inorganic compound provided, in other words, the inorganic compound provided in an amount of about 1 to 10% by weight with respect to the inner core layer 11.
- the protective layer 12a provided with the inorganic compound in an amount such that the content of the alkali metal oxide with respect to the inner core layer 11 is less than 0.15% by weight, in other words, about 1% by weight with respect to the inner core layer 11.
- the protective layer 12a is made of the inorganic compound provided in an amount of less than%, it is difficult to sufficiently suppress reoxidation (a pellet metallization rate of 60% or more), while the inner core
- the raw pellet according to the present embodiment is provided so as to surround the inner core layer 11 containing the iron oxide-containing raw material, the reducing carbonaceous material, and the slagging agent, and the surface of the inner core layer 11.
- the raw pellet 20 is provided with the coating layer 22, and the coating layer 22 contains an inorganic compound having a melting point of 750 ° C. or higher and lower than 1100 ° C. and a combustion carbon material.
- Such a raw pellet 20 according to the present embodiment manufactures the inner core layer 11 in the same manner as the raw pellet 10 according to the above-described embodiment, and inputs the inner core layer 11 into a mixer such as a mixer.
- a mixer such as a mixer.
- the inorganic compound powder and the combustion carbon material are added, and a binder (appropriate amount if necessary) is added to the surface of the inner core layer 11 to cover the surface.
- the layer 22 After the layer 22 is provided, it can be easily manufactured by taking it out of the mixer and drying it.
- the raw pellet 10 according to the above-described embodiment includes a protective layer 12a provided with the inorganic compound so as to surround the surface of the inner core layer 11, and a combustion carbon material so as to surround the surface of the protective layer 12a.
- the raw pellet 20 according to the present embodiment is obtained by mixing the inorganic compound and the combustion carbonaceous material to form the inner core layer 11.
- the coating layer 22 is formed of a single layer so as to surround the surface.
- the same effect as that of the raw pellet 10 according to the above-described embodiment can be obtained, and the coating layer 22 can be applied in a single operation. Since it can be provided, manufacturing can be facilitated.
- the coating layer 22 contains the inorganic compound so that the alkali metal oxide is contained in an amount of 0.15 to 1.5% by weight with respect to the weight of the inner core layer 11.
- the inorganic compound is preferably contained in an amount of about 1 to 10% by weight with respect to the inner core layer 11.
- the coating layer 22 contains the inorganic compound in an amount of less than%, it is difficult to sufficiently suppress reoxidation (a pellet metallization rate of 60% or more), while the inner core layer 11
- the coating layer 22 containing the inorganic compound in an amount exceeding 1.5% by weight with respect to the alkali metal oxide, in other words, an amount exceeding about 10% by weight with respect to the inner core layer 11 This is because if the coating layer 22 contains the inorganic compound, overmelting is likely to occur.
- the raw pellet according to the present invention can be easily made into a pellet in which reoxidation is stably suppressed without increasing the firing temperature, it can be used extremely beneficially in the steel industry.
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Organic Chemistry (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Manufacturing & Machinery (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Manufacture And Refinement Of Metals (AREA)
- Other Surface Treatments For Metallic Materials (AREA)
- Powder Metallurgy (AREA)
Abstract
Description
本発明に係る生ペレットの第一番目の実施形態を図1に基づいて説明する。
本発明に係る生ペレットの第二番目の実施形態を図2に基づいて説明する。ただし、前述した第一番目の実施形態の場合と同様な部分については、前述した第一番目の実施形態の説明で用いた符号と同様な符号を用いることにより、第一番目の実施形態での説明と重複する説明を省略する。
11 内核層
12 被覆層
12a 保護層
12b 燃焼層
20 生ペレット
22 被覆層
Claims (4)
- 酸化鉄含有原料と還元用炭材と造滓剤とを含有する内核層と、前記内核層の表面を包囲するように設けられた被覆層とを備えてなる生ペレットであって、
前記被覆層が、750℃以上1100℃未満の融点を有する無機化合物と、燃焼用炭材とを含有してなるものである
ことを特徴とする生ペレット。 - 請求項1に記載の生ペレットにおいて、
前記被覆層の前記無機化合物が、アルカリ金属酸化物を含有するものである
ことを特徴とする生ペレット。 - 請求項2に記載の生ペレットにおいて、
前記内核層の重量に対する割合で前記アルカリ金属酸化物を0.15~1.5重量%含有するように、前記被覆層が前記無機化合物を有している
ことを特徴とする生ペレット。 - 請求項1から請求項3のいずれか一項に記載の生ペレットにおいて、
前記被覆層が、
前記内核層の表面を包囲するように設けられた前記無機化合物を含有する保護層と、
前記保護層の表面を包囲するように設けられた前記燃焼用炭材を含有する燃焼層と
からなることを特徴とする生ペレット。
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2012520200A JP5480969B2 (ja) | 2010-06-16 | 2010-06-16 | 生ペレット |
PCT/JP2010/060159 WO2011158338A1 (ja) | 2010-06-16 | 2010-06-16 | 生ペレット |
US13/701,727 US9273262B2 (en) | 2010-06-16 | 2010-06-16 | Green pellet |
CN201080067390.4A CN102939395B (zh) | 2010-06-16 | 2010-06-16 | 生球 |
DE112010005664.1T DE112010005664B4 (de) | 2010-06-16 | 2010-06-16 | Grünpellet |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/JP2010/060159 WO2011158338A1 (ja) | 2010-06-16 | 2010-06-16 | 生ペレット |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2011158338A1 true WO2011158338A1 (ja) | 2011-12-22 |
Family
ID=45347763
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2010/060159 WO2011158338A1 (ja) | 2010-06-16 | 2010-06-16 | 生ペレット |
Country Status (5)
Country | Link |
---|---|
US (1) | US9273262B2 (ja) |
JP (1) | JP5480969B2 (ja) |
CN (1) | CN102939395B (ja) |
DE (1) | DE112010005664B4 (ja) |
WO (1) | WO2011158338A1 (ja) |
Families Citing this family (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR102110643B1 (ko) * | 2013-07-10 | 2020-05-13 | 제이에프이 스틸 가부시키가이샤 | 소결광 제조용 탄재 내장 조립 입자와 그 제조 방법 |
CN104726630A (zh) * | 2015-03-25 | 2015-06-24 | 甘肃酒钢集团宏兴钢铁股份有限公司 | 转炉用高碱度复合金属化球团及其生产工艺 |
WO2017006200A1 (en) * | 2015-07-07 | 2017-01-12 | Sabic Global Technologies B.V. | Coated iron ore pellets and a process of making and reducing the same to form reduced iron pellets |
US11479832B2 (en) | 2016-04-22 | 2022-10-25 | Sumitomo Metal Mining Co., Ltd. | Method for smelting oxide ore |
CA3110511C (en) | 2016-04-27 | 2023-01-31 | Sumitomo Metal Mining Co., Ltd. | Oxide ore smelting method |
US11427877B2 (en) * | 2017-09-21 | 2022-08-30 | Nucor Corporation | Direct reduced iron (DRI) heat treatment, products formed therefrom, and use thereof |
DE102020116425A1 (de) | 2020-06-22 | 2021-12-23 | Salzgitter Flachstahl Gmbh | Verfahren zur Herstellung von Rohstahl mit niedrigem N-Gehalt |
CN114737011B (zh) * | 2022-04-14 | 2023-08-11 | 首钢集团有限公司 | 一种转炉用造渣剂及降低转炉石灰消耗的方法 |
Citations (5)
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JPS63312920A (ja) * | 1987-06-17 | 1988-12-21 | Kawasaki Steel Corp | 酸化防止性に優れた塊状物の製造方法 |
JP2000087149A (ja) * | 1998-09-08 | 2000-03-28 | Kobe Steel Ltd | 鉄鉱石ペレット製造方法 |
JP2000192154A (ja) * | 1998-12-24 | 2000-07-11 | Sumitomo Metal Ind Ltd | 部分還元ペレットの製造方法 |
JP2003129142A (ja) * | 2001-10-24 | 2003-05-08 | Kobe Steel Ltd | 酸化金属塊成物の製造方法 |
JP2005194544A (ja) * | 2003-12-26 | 2005-07-21 | Jfe Steel Kk | 半還元塊成鉱の製造方法 |
Family Cites Families (8)
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GB818615A (en) * | 1957-06-03 | 1959-08-19 | Illinois Clay Products Co | Method of strengthening iron ore agglomerates |
JPS5110167B1 (ja) * | 1971-03-12 | 1976-04-02 | ||
DE2306647A1 (de) * | 1973-02-10 | 1974-08-15 | Werner Wenzel | Verfahren zum einschmelzen von eisenschwamm |
US3975182A (en) * | 1973-08-09 | 1976-08-17 | United States Steel Corporation | Pellets useful in shaft furnace direct reduction and method of making same |
US4042375A (en) * | 1974-10-14 | 1977-08-16 | Ici Australia Limited | Roasting process for the direct reduction of ores |
CA2251339A1 (en) * | 1997-10-30 | 1999-04-30 | Hidetoshi Tanaka | Method of producing iron oxide pellets |
JP2001342509A (ja) * | 2000-06-02 | 2001-12-14 | Kobe Steel Ltd | 金属鉄の製造方法および装置 |
JP4391841B2 (ja) | 2004-02-05 | 2009-12-24 | 三菱日立製鉄機械株式会社 | 還元鉄成型体の製造方法 |
-
2010
- 2010-06-16 JP JP2012520200A patent/JP5480969B2/ja active Active
- 2010-06-16 US US13/701,727 patent/US9273262B2/en not_active Expired - Fee Related
- 2010-06-16 WO PCT/JP2010/060159 patent/WO2011158338A1/ja active Application Filing
- 2010-06-16 CN CN201080067390.4A patent/CN102939395B/zh active Active
- 2010-06-16 DE DE112010005664.1T patent/DE112010005664B4/de active Active
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS63312920A (ja) * | 1987-06-17 | 1988-12-21 | Kawasaki Steel Corp | 酸化防止性に優れた塊状物の製造方法 |
JP2000087149A (ja) * | 1998-09-08 | 2000-03-28 | Kobe Steel Ltd | 鉄鉱石ペレット製造方法 |
JP2000192154A (ja) * | 1998-12-24 | 2000-07-11 | Sumitomo Metal Ind Ltd | 部分還元ペレットの製造方法 |
JP2003129142A (ja) * | 2001-10-24 | 2003-05-08 | Kobe Steel Ltd | 酸化金属塊成物の製造方法 |
JP2005194544A (ja) * | 2003-12-26 | 2005-07-21 | Jfe Steel Kk | 半還元塊成鉱の製造方法 |
Also Published As
Publication number | Publication date |
---|---|
CN102939395B (zh) | 2016-09-07 |
US20130111809A1 (en) | 2013-05-09 |
JPWO2011158338A1 (ja) | 2013-08-15 |
JP5480969B2 (ja) | 2014-04-23 |
DE112010005664T5 (de) | 2013-04-04 |
DE112010005664B4 (de) | 2020-06-10 |
US9273262B2 (en) | 2016-03-01 |
CN102939395A (zh) | 2013-02-20 |
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