WO2009030809A1 - Method and strand sintering equipment for continuous sintering and pre-reduction of pelletized mineral material - Google Patents

Method and strand sintering equipment for continuous sintering and pre-reduction of pelletized mineral material Download PDF

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Publication number
WO2009030809A1
WO2009030809A1 PCT/FI2008/050479 FI2008050479W WO2009030809A1 WO 2009030809 A1 WO2009030809 A1 WO 2009030809A1 FI 2008050479 W FI2008050479 W FI 2008050479W WO 2009030809 A1 WO2009030809 A1 WO 2009030809A1
Authority
WO
WIPO (PCT)
Prior art keywords
gas
sintering
zone
pressure
duct
Prior art date
Application number
PCT/FI2008/050479
Other languages
English (en)
French (fr)
Inventor
Janne Ollila
Helge Krogerus
Petri Jokinen
Jorma Daavittila
Original Assignee
Outotec Oyj
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Outotec Oyj filed Critical Outotec Oyj
Priority to EA201000294A priority Critical patent/EA016211B1/ru
Priority to CN2008801124413A priority patent/CN101835913B/zh
Priority to BRPI0816313A priority patent/BRPI0816313B8/pt
Publication of WO2009030809A1 publication Critical patent/WO2009030809A1/en
Priority to ZA2010/01706A priority patent/ZA201001706B/en

Links

Classifications

    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22BPRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B1/00Preliminary treatment of ores or scrap
    • C22B1/14Agglomerating; Briquetting; Binding; Granulating
    • C22B1/16Sintering; Agglomerating
    • C22B1/20Sintering; Agglomerating in sintering machines with movable grates
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22BPRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B1/00Preliminary treatment of ores or scrap
    • C22B1/14Agglomerating; Briquetting; Binding; Granulating
    • C22B1/16Sintering; Agglomerating
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22BPRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B1/00Preliminary treatment of ores or scrap
    • C22B1/14Agglomerating; Briquetting; Binding; Granulating
    • C22B1/16Sintering; Agglomerating
    • C22B1/20Sintering; Agglomerating in sintering machines with movable grates
    • C22B1/205Sintering; Agglomerating in sintering machines with movable grates regulation of the sintering process
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27FURNACES; KILNS; OVENS; RETORTS
    • F27BFURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B21/00Open or uncovered sintering apparatus; Other heat-treatment apparatus of like construction
    • F27B21/06Endless-strand sintering machines

Definitions

  • the invention relates to a method defined in the preamble of Claim 1.
  • the invention further relates to equipment defined in the preamble of Claim 8.
  • Continuous strand sintering is used for agglomerating pellets after pelletizing powdery mineral material, improving the strength and reactivity of the pellets.
  • the mineral material herein refers to a min- eral, which has similar crystal chemistry properties to those of the oxide group and contains the metal to be recovered, the metal mainly comprising compounds of metal and oxygen.
  • the strand sintering furnace 1 shown in Fig. 1 should be mentioned, being divided into several sequential zones I to VII, different temperature conditions prevailing in each one of them.
  • the strand sintering equipment includes a perforated conveyor belt 2, which is conveyed as an endless loop around two deflector rolls 3, 4. At the left forward end of the furnace, wet fresh pellets are fed onto the conveyor belt 2 to form a bed with a thickness of a few decimetres.
  • the conveyor belt 2 conveys the bed of pellets through the drying I, heating II, sintering III, equalizing IV zones of the sintering furnace and further through sequential cooling zones V, VI, VII.
  • the pellets After travelling through the cooling zones, the pellets exit at the far end of the strand sintering equipment in a sintered form.
  • the energy contained in the cooling gases at the tail end of the furnace is used for drying, heating, and sintering at the forward end of the furnace, which is why the strand sintering equipment includes overhead circulation gas ducts 5, 6, 30 for implementing the gas circulation mentioned above.
  • Burners 7, 8 have been placed in the circulation gas ducts 5 and 6 and are used to increase the temperature of the conducted gas to the sintering temperature needed in the sintering.
  • the purpose of the invention is to disclose a method and equipment, which can be used to improve the process according to the known technology so that, in connection with sintering, pre-reduction of the mineral material is provided, whereby at the subsequent stages of the process, no separate pre-reduction equipment is needed before the actual reduction, which takes place in an electric fusion furnace or the like.
  • Another purpose of the invention is to disclose a method and equipment, which can be used to re- prise the energy consumption of the process.
  • an essentially smooth pellet bed is formed from the pellets onto a sintering base.
  • the pellet bed is conveyed through the process zones of different temperatures, including at least the heating/sintering zone and at least one subsequent cooling zone.
  • gas is conducted through the pellet bed.
  • the gas that is conducted from the cooling zone through the pellet bed is circulated to the heating/sintering zone.
  • the method in the method, at least part of the gas that has travelled in the heating/sintering zone through the pellet bed is conducted to the cooling zone.
  • the gas composition is rendered reductive for pre-reducing the pellets in the heating/sintering zone.
  • the gas composition is measured and the gas composition is altered on the basis of the measurement to keep the composition reductive.
  • One advantage of the invention is the fact that, simultaneously with the sintering, pre-reduction of the material can be effected, when a reductive atmosphere is arranged in the sintering furnace, whereby at the subsequent stages of the process, no separate pre-reduction equipment is needed. The actual reduction takes place in the electric fusion furnace or the like.
  • the gas composition is measured by defining the carbon monoxide and/or the oxygen content of the gas.
  • the gas is heated in the direction of rotation after the cooling zone and before the heating and sintering zones by burning a fuel in the gas, and the gas composition is kept reductive by adjusting the air coefficient of the combustion on the basis of the gas composition meas- ured.
  • the gas composition is adjusted by conducting air to the gas in the direction of rotation after the heating/sintering zone and before the cooling zone on the basis of the gas composition measured.
  • the gas pressure is adjusted to a predefined level by removing from the gas circulation the excess part of gas that is formed in the process during the combustion of the fuel.
  • the gas pressure is defined in the heating/sintering zone, and on the basis of the defined pressure, the excess part of gas is conducted to the atmosphere in the direction of rotation of the gas after the heating and sintering zones and before the cooling zone.
  • the gas is rendered reductive by means of a carbonaceous material that is arranged on the surface of the pellet bed and/or among the pellets, and/or inside the pellets.
  • the strand sintering equipment includes a strand sintering furnace, which is divided into a number of sequential process zones of different temperature conditions, the zones including at least one heating/sintering zone, wherein the pellets are sintered, and at least one subsequent cooling zone, wherein the sintered pellets are cooled.
  • the conveyor belt is directed as an endless loop around a deflector roll and a drive roll for conveying the bed of pellets through the process zones of the strand sintering furnace.
  • the conveyor belt is gas permeable.
  • An overhead circulation gas duct is located above the conveyor belt for conducting the gas from at least one cooling zone to the heating/sintering zone and onto the bed of pellets.
  • a burner is placed in the overhead circulation gas duct to heat the gas that travels in the duct.
  • a lower exhaust gas duct is located below the conveyor belt for conducting the gas that exits the heating/sintering zone and has been conducted through the pellet bed and the conveyor belt.
  • a blower is arranged in the lower exhaust gas duct to provide a movement of the gas.
  • a lower inlet gas duct is located below the conveyor belt for conducting the gas to the cooling zone.
  • the strand sintering equipment includes a connecting channel, which provides flow communication from the lower exhaust gas duct to the inlet gas duct to conduct at least part of the gas exiting the heating/sintering zone to the cooling zone.
  • the equipment further includes a gas sensor, which is arranged in the connecting channel to detect the gas composition.
  • the equipment further includes a leakage air channel, which provides flow communication between the lower exhaust gas duct and the atmosphere.
  • the equipment further includes a leakage air valve for opening and closing flow communication in the leakage air channel.
  • the equipment includes a control device, which, in order to render the gas composition reductive, is arranged to monitor the gas compositions detected by the gas sensor and, on the basis of that, to control the leakage air valve for controlling the access of air from the atmosphere to the exhaust gas duct for adjusting the oxygen content of the gas, and/or to adjust the combustion air coefficient of the burner for adjusting the carbon monoxide content of the gas.
  • a control device which, in order to render the gas composition reductive, is arranged to monitor the gas compositions detected by the gas sensor and, on the basis of that, to control the leakage air valve for controlling the access of air from the atmosphere to the exhaust gas duct for adjusting the oxygen content of the gas, and/or to adjust the combustion air coefficient of the burner for adjusting the carbon monoxide content of the gas.
  • the equipment includes a pressure sensor, which is ar- ranged to measure the gas pressure in the heating/sintering zone.
  • a pressure reduction channel is arranged after the blower in the flow direction to provide flow communication between the connecting channel and the atmosphere.
  • a pressure-controlled valve is arranged in the pressure reduction channel and, controlled by the pressure detected by the pressure sensor, it is arranged to allow gas to exit the connecting channel to reduce the gas pressure to a predefined level.
  • the strand sintering equipment includes a heating zone, a sintering zone, a first cooling zone and a second cooling zone, which are separated from each other by walls .
  • the control device comprises a gas analyzer that measures the carbon monoxide and/or oxygen content of the gas.
  • Fig. 1 shows schematically a strand sintering equipment according to the known technology
  • Fig. 2 shows schematically an embodiment of the strand sintering equipment according to the inven- tion.
  • Fig. 2 shows a strand sintering furnace 1, which is divided into several sequential zones I to VII, different temperature conditions prevailing in each one of them.
  • the zones in this example comprise a drying zone I, a heating zone II, a sintering zone III, an equalizing zone IV, and three cooling zones V, VI, VII.
  • the conveyor belt 2 is directed as an endless loop around a deflector roll 3 and a drive roll 4 to convey a bed of pellets through the zones I to VII of the strand sintering device 1.
  • the conveyor belt 2 is a perforated steel band, the perforation allowing the gas to pass through.
  • wet fresh pellets are fed onto the conveyor belt 2 to form a bed with a thickness of several decimetres.
  • the conveyor belt 2 conveys the pellet bed through the drying zone I, heating zone II, and sintering zone III of the furnace to the stabilizing or equalizing zone IV, after which the pellet bed further travels through the sequential first cooling zone V, second cooling zone VI, and third cooling zone VII. After travelling through the cooling zones, the pellets exit the tail end of the strand sintering equipment in a sintered form.
  • a first circulation gas duct 5 is arranged above the conveyor belt 2 to conduct gas from the second cooling zone VI to the heating zone II and onto the bed of pellets.
  • a first burner 7 is arranged in the first circulation gas duct.
  • first exhaust gas duct 9 which receives the gas that comes from the heating zone II and has been directed through the pellet bed and the conveyor belt.
  • a first blower 11 is arranged in the first exhaust gas duct 9 to provide a movement of the gas.
  • a first inlet gas duct 13 is located below the conveyor belt 2 for conducting the gas to the second cooling zone VI.
  • a first connecting channel 15 provides flow communication from the first exhaust gas duct 9 to the first inlet gas duct 13 so that at least part of the gas exiting the heating zone II enters the second cooling zone VI.
  • first gas sensor 17 for detecting the gas composition.
  • a control device 23 is arranged to monitor the gas compositions detected by the first gas sensor 17 and, on the basis of that, to control 23 the combus- tion air coefficient of the first burner 7 for adjusting the carbon monoxide content of the gas and to control the first leakage air valve 21 to allow air from the atmosphere to enter the first exhaust gas duct 9 for adjusting the oxygen control of the gas.
  • a second circulation gas duct 6 above the conveyor belt 2 conducts the gas from the first cooling zone V to the sintering zone III and onto the pellet bed.
  • a second burner 8 is arranged in the second circulation gas duct.
  • a second exhaust gas duct 10 is located below the conveyor belt for conducting the gas that comes from the sintering zone III and has been conducted through the pellet bed and the conveyor belt.
  • a second blower 12 is arranged in the second exhaust gas duct to provide a movement of the gas.
  • a second inlet gas duct 14 is located below the conveyor belt for conducting the gas to the first cooling zone V.
  • a second connecting channel 16 provides flow communication from the second exhaust gas duct 10 to the second inlet gas duct 14 so that at least part of the gas exiting the sintering zone III enters the first cooling zone V.
  • a second gas sensor 18 is arranged in the second connecting channel 16 for detecting the gas composition.
  • a second leakage air channel 20 provides flow communication between the second exhaust gas duct 10 and the atmosphere. In the second leakage air channel 20, there is a second leak- age air valve 22 for opening and closing the flow communication.
  • a control device 23 is arranged to monitor the gas compositions detected by the second gas sensor 18 and, on the basis of that, to adjust the combustion air coef- ficient of the second burner 8 to adjust the carbon monoxide content of the gas and to control the second leakage air valve 22 to control the entry of air from the atmosphere to the second exhaust gas duct 10 to adjust the oxygen content of the gas.
  • the gas composition is rendered reductive for pre- reducing the pellets in the heating/sintering zone, and the gas composition is measured.
  • the gas composition is measured by defining the carbon monoxide and/or the oxygen content of the gas.
  • the gas composition is altered to keep the composition reductive.
  • the gas is heated in the direction of rotation after the cooling zone and before the heating/sintering zone by burning a fuel in the gas, and the gas composition is kept reductive by adjusting the combustion air coefficient on the basis of the gas composition measured.
  • the gas composition is adjusted by conducting air to the gas in the direction of rotation after the heating/sintering zone and before the cooling zone on the basis of the gas composition measured.
  • the pressure in the closed gas circulations formed according to the invention increases cumulatively, unless the pressure is decreased every now and then.
  • the gas pressure is adjusted to a predefined level by removing from the gas circulation a volume of gas that corresponds to the volume of gas generated in the process during the combustion of the fuel. Therefore, the gas pressure is measured in the heating/sintering zone, and on the basis of the pressure defined, the excess portion of gas is conducted to the atmosphere in the direction of rotation of the gas after the heating and sintering zones and before the cooling zone.
  • the equipment includes a first pressure sensor 24, which is arranged to measure the gas pressure in the heating zone II .
  • a first pressure-controlled valve 28 is arranged in the first pressure reduction channel 26. The first pressure-controlled valve 28 releases gas from the first connecting channel 15, being controlled by the pressure detected by the first pressure sensor 24, to reduce the pressure to a predefined level .
  • a second pressure sensor 25 is arranged to measure the gas pressure in the sintering zone III.
  • a second pressure-controlled valve 29 is arranged in the second pressure reduction channel 27. The second pressure-controlled valve 29 releases gas from the second connecting channel 16, being controlled by the pressure detected by the second pressure sensor 25, to re-lude the pressure to a predefined level.
  • carbonaceous material such as coke
  • carbonaceous material can also be arranged on the sur- face of the pellet bed and/or among the pellets and/or inside the pellets.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Environmental & Geological Engineering (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Geology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • General Engineering & Computer Science (AREA)
  • Manufacture And Refinement Of Metals (AREA)
  • Tunnel Furnaces (AREA)
  • Furnace Details (AREA)
PCT/FI2008/050479 2007-09-06 2008-09-01 Method and strand sintering equipment for continuous sintering and pre-reduction of pelletized mineral material WO2009030809A1 (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
EA201000294A EA016211B1 (ru) 2007-09-06 2008-09-01 Способ и ленточная агломерационная установка для непрерывного спекания и предварительного восстановления гранулированного минерального вещества
CN2008801124413A CN101835913B (zh) 2007-09-06 2008-09-01 对制粒矿物材料连续烧结和预还原的方法和带式烧结设备
BRPI0816313A BRPI0816313B8 (pt) 2007-09-06 2008-09-01 Método e equipamento de sinterização de fios para sinterização contínua e redução prévia de material mineral peletizado
ZA2010/01706A ZA201001706B (en) 2007-09-06 2010-03-10 Method and strand sintering equipment for continuous sintering and pre-reduction of pelletized mineral material

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI20075614A FI119940B (fi) 2007-09-06 2007-09-06 Menetelmä ja nauhasintrauslaitteisto pelletoidun mineraalimateriaalin jatkuvatoimiseksi sintraamiseksi ja esipelkistämiseksi
FI20075614 2007-09-06

Publications (1)

Publication Number Publication Date
WO2009030809A1 true WO2009030809A1 (en) 2009-03-12

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ID=38572948

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/FI2008/050479 WO2009030809A1 (en) 2007-09-06 2008-09-01 Method and strand sintering equipment for continuous sintering and pre-reduction of pelletized mineral material

Country Status (6)

Country Link
CN (1) CN101835913B (ru)
BR (1) BRPI0816313B8 (ru)
EA (1) EA016211B1 (ru)
FI (1) FI119940B (ru)
WO (1) WO2009030809A1 (ru)
ZA (1) ZA201001706B (ru)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101839637A (zh) * 2009-03-17 2010-09-22 Tdk株式会社 连续烧结炉和制造系统
WO2012038602A1 (en) * 2010-09-24 2012-03-29 Outotec Oyj Method for the continuous sintering of mineral material and sintering equipment
WO2012038603A1 (en) * 2010-09-24 2012-03-29 Outotec Oyj Method for starting a sintering furnace, and sintering equipment
CN106970173A (zh) * 2015-11-20 2017-07-21 日本株式会社日立高新技术科学 产生气体分析方法以及产生气体分析装置

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101824111B1 (ko) * 2015-11-18 2018-02-01 주식회사 포스코 원료 처리 설비 및 이를 이용한 원료 처리 방법
JP6280964B2 (ja) * 2015-11-20 2018-02-14 株式会社日立ハイテクサイエンス 発生ガス分析装置及び発生ガス分析方法
CN106440810B (zh) * 2016-11-23 2017-09-22 西安交通大学 一种烧结机

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2042144A (en) * 1979-02-06 1980-09-17 Luossavaara Kiirunavaara Ab Sintering ore pellets
US4337083A (en) * 1979-10-22 1982-06-29 Asarco Incorporated Non-polluting, cooling method and heat recuperative sintering method
US4689007A (en) * 1984-09-08 1987-08-25 Dravo Corporation Process of thermally treating lump or agglomerated materials on a travelling grate
US4789332A (en) * 1986-06-26 1988-12-06 Aluminum Company Of America Apparatus for removing volatiles from metal
US6063160A (en) * 1997-04-10 2000-05-16 Outokumpu Oyj Method for sintering finely divided material
FI20021469A (fi) * 2002-08-13 2004-02-14 Jyrki Petteri Noponen Pellettien CO-tiivistys nauhasintrausprosessissa

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1013805B (zh) * 1984-09-08 1991-09-04 金属股份有限公司 在移动式炉栅上对团块或团粒材料进行热处理的方法
CN1105391A (zh) * 1994-01-10 1995-07-19 鞍山钢铁公司 冷却机低温废气循环烧结方法

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2042144A (en) * 1979-02-06 1980-09-17 Luossavaara Kiirunavaara Ab Sintering ore pellets
US4337083A (en) * 1979-10-22 1982-06-29 Asarco Incorporated Non-polluting, cooling method and heat recuperative sintering method
US4689007A (en) * 1984-09-08 1987-08-25 Dravo Corporation Process of thermally treating lump or agglomerated materials on a travelling grate
US4789332A (en) * 1986-06-26 1988-12-06 Aluminum Company Of America Apparatus for removing volatiles from metal
US6063160A (en) * 1997-04-10 2000-05-16 Outokumpu Oyj Method for sintering finely divided material
FI20021469A (fi) * 2002-08-13 2004-02-14 Jyrki Petteri Noponen Pellettien CO-tiivistys nauhasintrausprosessissa

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101839637A (zh) * 2009-03-17 2010-09-22 Tdk株式会社 连续烧结炉和制造系统
WO2012038602A1 (en) * 2010-09-24 2012-03-29 Outotec Oyj Method for the continuous sintering of mineral material and sintering equipment
WO2012038603A1 (en) * 2010-09-24 2012-03-29 Outotec Oyj Method for starting a sintering furnace, and sintering equipment
EP2619517A1 (en) * 2010-09-24 2013-07-31 Outotec OYJ Method for the continuous sintering of mineral material and sintering equipment
AU2011306841B2 (en) * 2010-09-24 2013-11-28 Outotec Oyj Method for the continuous sintering of mineral material and sintering equipment
EP2619517A4 (en) * 2010-09-24 2014-04-09 Outotec Oyj METHOD FOR CONTINUOUSLY EMINATING A MINERAL MATERIAL AND SINTERING DEVICE THEREFOR
EA025306B1 (ru) * 2010-09-24 2016-12-30 Ототек Оюй Способ запуска агломерационной печи и агломерационная установка
US9534844B2 (en) 2010-09-24 2017-01-03 Outotec Oy Method for the continuous sintering of mineral material and sintering equipment
EA025566B1 (ru) * 2010-09-24 2017-01-30 Ототек Оюй Способ непрерывной агломерации минерального материала и агломерационная установка
CN106970173A (zh) * 2015-11-20 2017-07-21 日本株式会社日立高新技术科学 产生气体分析方法以及产生气体分析装置

Also Published As

Publication number Publication date
EA016211B1 (ru) 2012-03-30
FI20075614A0 (fi) 2007-09-06
BRPI0816313B8 (pt) 2023-03-28
FI20075614A (fi) 2009-03-07
CN101835913B (zh) 2012-07-25
ZA201001706B (en) 2011-02-23
CN101835913A (zh) 2010-09-15
EA201000294A1 (ru) 2010-10-29
BRPI0816313B1 (pt) 2016-10-11
FI119940B (fi) 2009-05-15
BRPI0816313A2 (pt) 2015-03-24

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