EP0446779B1 - Verfahren und Anlage zur Verarbeitung von ölhaltigem Walzenzunder und ähnlichen Stoffen - Google Patents

Verfahren und Anlage zur Verarbeitung von ölhaltigem Walzenzunder und ähnlichen Stoffen Download PDF

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Publication number
EP0446779B1
EP0446779B1 EP19910103449 EP91103449A EP0446779B1 EP 0446779 B1 EP0446779 B1 EP 0446779B1 EP 19910103449 EP19910103449 EP 19910103449 EP 91103449 A EP91103449 A EP 91103449A EP 0446779 B1 EP0446779 B1 EP 0446779B1
Authority
EP
European Patent Office
Prior art keywords
continuous
furnace
mill scale
heating furnace
oil
Prior art date
Legal status (The legal status 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 status listed.)
Expired - Lifetime
Application number
EP19910103449
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0446779A3 (de
EP0446779A2 (de
Inventor
Uwe Dr. Schierloh
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Preussag Stahl AG
Original Assignee
Preussag Stahl AG
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Filing date
Publication date
Application filed by Preussag Stahl AG filed Critical Preussag Stahl AG
Publication of EP0446779A2 publication Critical patent/EP0446779A2/de
Publication of EP0446779A3 publication Critical patent/EP0446779A3/de
Application granted granted Critical
Publication of EP0446779B1 publication Critical patent/EP0446779B1/de
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Classifications

    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B1/00—Preliminary treatment of ores or scrap
    • C22B1/14—Agglomerating; Briquetting; Binding; Granulating
    • C22B1/16—Sintering; Agglomerating
    • 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
    • C22B1/16—Sintering; Agglomerating
    • C22B1/20—Sintering; Agglomerating in sintering machines with movable grates
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B21/00—Open or uncovered sintering apparatus; Other heat-treatment apparatus of like construction
    • F27B21/06—Endless-strand sintering machines

Definitions

  • the invention relates to a method and a plant for processing oil-containing, wet mill scale and similar substances according to the preamble of claim 1 and claim 7.
  • Mill scale and mill scale sludge occur in rolling mills when the scale layer has to be removed before the rolling process.
  • Tinder is iron oxide, which can be added to the raw material again in a sintering plant, for example.
  • scale mixes with water, which is used as cooling water or as pressurized water for spraying off the scale layer, and with oil or grease, which was used, for example, to lubricate bearings.
  • Larger scale particles can be separated in a wastewater treatment plant for the circulation water of the rolling mill, however, complete deoiling is not possible. Finer scale particles can only be separated from the circulating water to a limited extent by settling, but otherwise by filters.
  • roller scale sludge which still has a high water content of up to 30% and an oil content of up to more than 6%. If the roller scale sludge is used during sintering, not only does the water evaporate, but at least some of the oil escapes unburned. Some of the oily constituents condense in the electrostatic precipitators that are used today, which are responsible for the flue gases of the sintering plant to clean dust from legally stipulated minimum levels. With high loads of organic material in the flue gas, however, fires or, in the limit, explosions in the filter can occur, which is easily caused by electrical flashovers between the spray and precipitation electrodes of the electrostatic precipitator. Condensed oil components make it more difficult to clean the precipitation electrodes, and oil that is not separated increases the cloudiness of the emitted flue gas indirectly (by impairing the function of the electrostatic filter) and immediately (as a condensed oil mist).
  • oil-containing substances such as sands are often produced, from which the oil is difficult to remove and which must therefore be brought to a special landfill.
  • An extraction of these irregularly occurring oil-containing substances can be very complex under certain circumstances. Removal of oil from these substances by simple means would therefore be desirable, even if the substances themselves cannot be fed into the blast furnace.
  • a method for the combustion of hydrocarbons and fission products in sintered exhaust gases is known from US Pat. No. 3,857,694.
  • a sinter mixture containing hydrocarbons is fed into the sintering process.
  • the hydrocarbons expelled due to the ignition of the sinter mixture are collected in the wind boxes arranged after the ignition hood and by means of a blower partly passed through the hot sintered mixture in the cooling section of the sintered belt and partly passed to the ignition furnace of the sintered belt, whereby good combustion of the hydrocarbons and fission products and at the same time good cooling is to be achieved.
  • the hydrocarbons are not intended to be used.
  • Another object of the invention is to use the energy content of the oil contained in the mill scale or similar solid.
  • the treatment takes place directly in connection with the operation of an iron ore sintering plant.
  • the hot exhaust air from the cooler of a sintering system is fed to a continuous furnace in which the hot exhaust air and the oil-containing solid are guided in countercurrent, such as mill scale.
  • the evaporated, partly also burned oil absorbing exhaust air leaves the continuous furnace has cooled due to the evaporation of moisture from the mill scale and because of the heating of the mill scale by an amount corresponding to the heat capacity flow conditions and is due to its still large heat content as preheated combustion air Ignition furnace fed to the sintering plant.
  • temperatures above 1,000 ° C the part of the oil that has not yet burned, which comes from the continuous furnace with the combustion air and where it was thermally released from the mill scale or other solid, also burns there.
  • the high combustion temperatures and the - albeit small - excess of oxygen in the ignition furnace of a sintering plant ensure the complete combustion of the oil. A load on the smoke filter of the sintering plant oil is therefore avoided.
  • the calorific value of the oil is fully used in the continuous furnace, there by partial combustion, and in the ignition furnace, there by residual combustion.
  • the dry, hot and thermally oil-free mill scale coming from the continuous furnace is fed directly to the return material of the sintering system, for example, via discharge channels.
  • B. the hot return material and in this way reaches the iron ore mixture to be sintered.
  • the mill scale can also be fed directly into the iron ore mixture, bypassing the return material flow, which makes it easier to control the sintering system with regard to balancing the amount of return material and the use of return material.
  • the heat content of the hot mill scale is - apart from the inevitable losses during transport - introduced into the iron ore mixture. It is therefore preheated in accordance with the heat and quantity ratios of mill scale / iron ore mixture and thus passes under the ignition furnace of the sintering plant. A large part of the heat coming from the continuous furnace with the hot mill scale is therefore used.
  • oil can also be removed from them with the help of the hot exhaust air of a sinter cooler and its introduction into the ignition furnace of the sintering plant.
  • the oil-free, dried sands are generally not fed to the sintering plant, but are discharged oil-free from the material flow of the sintering plant. They generally correspond to In terms of material and time, not the requirements of the ore mixtures to be processed in the sinter plant.
  • a rotary tube furnace as a continuous furnace.
  • An alternative to this is the use of a deck oven, as was previously often used for roasting sulfidic ores. Both furnaces allow the countercurrent principle to be used for the hot sinter cooler exhaust air and the wet, oily mill scale.
  • the addition quantity of the mill scale to the continuous furnace is preferably controlled according to the temperature of the exiting exhaust air fed to the ignition furnace. In this way, constant operation of the ignition furnace is made possible.
  • the dwell time of the feed material in the continuous furnace should preferably be a maximum of about 30 minutes, since this treatment time is sufficient after tests have been carried out.
  • the supply of wet, oil-rich mill scale is interrupted. It is also preferred for controlling the cleaning function of the continuous furnace, the temperature of the hot mill scale emerging from the continuous furnace z. B. to measure infrared optically and interrupt the flow of wet mill scale to the continuous furnace if this temperature falls below a limit.
  • a cyclone for dust separation is preferably connected upstream of the ignition furnace.
  • the hood for extracting the hot radiator exhaust air is equipped in a known manner with safety devices for blowing off hot radiator exhaust air.
  • the figure shows the system parts of a preferred example in a highly simplified and only schematic manner.
  • the sintering machine 1 a traveling grate, is supplied with pretreated mix via a feed device 2, and in the ignition furnace 3 the coke bruise contained in the mix is ignited by ignition gas.
  • the sinter cake is crushed through a spike crusher 4 and into the sinter cooler 5, to which cooling air is fed via a fan 6.
  • the finished sinter is forwarded from the cooler 5 via the conveying path 7 to the blast furnace.
  • the flue gas from the sintering machine 1 is drawn off via an electrostatic filter 8 by a fan 9 and blown off via a chimney 10.
  • the hot cooler exhaust air is drawn off from the hot part of the sinter cooler 5 via a hood 11 and passed via a line 23 into a continuous furnace 12, through which the mill scale to be treated is countercurrent flows.
  • the cooler exhaust air which is now cooler, reaches a dust separator 13 from the continuous furnace 12 and is introduced into the ignition furnace 3 as warm combustion air by a fan 14.
  • This combustion air contains the flue gas from the oil burned in the continuous furnace and volatile and low-boiling components of this oil, which burn in the ignition furnace 3 at a temperature above 1000 ° C.
  • the mill scale is fed to the continuous furnace 12 by a suitable conveyor 15 with an adjustable delivery rate.
  • the hot scale, freed from oil, is z. B. via discharge channels 16 or another suitable transport device to the mixing device 17, in which ore, aggregates and coke breeze are mixed and into which sintered waste can be introduced via a conveyor 18 after separation from the finished sinter behind the cooler 5.
  • the oil-free mill scale can also be added directly to the sintered waste.
  • the mix passes through mixing and rolling drums, not shown, and then arrives at the feed device 2.
  • the hot, dry mill scale brings heat into the mix.
  • the hot cooler exhaust air cools down when the wet mill scale dries, but is also reheated by partial combustion of oil in the continuous furnace and feeds residual volatile oil to the ignition furnace 3 as a further fuel.
  • Blast gas from a line 25 is usually used as the ignition gas in the ignition furnace 3, and the combustion air is preheated depending on the blast furnace gas available. In the system according to the invention, separate preheating of the combustion air is not necessary, since there is still sufficient warm cooler exhaust air available.
  • the above examples show the relationship between the pilot air temperature and the possible throughput of mill scale through the continuous furnace.
  • a temperature meter 19 determines the temperature of the cooler exhaust air supplied as combustion air and throttles or stops the supply of mill scale into the continuous furnace 12 via control devices (not shown) or allows the cooler exhaust air to flow through a bypass 20.
  • a temperature meter 21 determines the temperature of the hot radiator exhaust air and intervenes in a similar manner if this z. B. temporarily drops below a predetermined value.
  • the temperature of the mill scale behind the continuous furnace 12 can also be monitored via a temperature meter 22 in order to ensure that sufficient thermal cleaning has taken place.
  • the specified temperature meters as well as other control devices of the sintering plant can work together via a computer to produce optimal process conditions.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Geology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Materials Engineering (AREA)
  • Environmental & Geological Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • General Engineering & Computer Science (AREA)
  • Manufacture And Refinement Of Metals (AREA)
EP19910103449 1990-03-10 1991-03-07 Verfahren und Anlage zur Verarbeitung von ölhaltigem Walzenzunder und ähnlichen Stoffen Expired - Lifetime EP0446779B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4008027 1990-03-10
DE19904008027 DE4008027C1 (enrdf_load_stackoverflow) 1990-03-10 1990-03-10

Publications (3)

Publication Number Publication Date
EP0446779A2 EP0446779A2 (de) 1991-09-18
EP0446779A3 EP0446779A3 (de) 1991-10-16
EP0446779B1 true EP0446779B1 (de) 1994-09-07

Family

ID=6402111

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19910103449 Expired - Lifetime EP0446779B1 (de) 1990-03-10 1991-03-07 Verfahren und Anlage zur Verarbeitung von ölhaltigem Walzenzunder und ähnlichen Stoffen

Country Status (3)

Country Link
EP (1) EP0446779B1 (enrdf_load_stackoverflow)
JP (1) JPH0777390A (enrdf_load_stackoverflow)
DE (2) DE4008027C1 (enrdf_load_stackoverflow)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5382279A (en) * 1994-01-07 1995-01-17 Bethlehem Steel Corporation Method and apparatus for combustion of steel plant wastes
AT405530B (de) * 1996-07-11 1999-09-27 Voest Alpine Ind Anlagen Verfahren zur thermischen behandlung von organisch belasteten materialien
DE50100974D1 (de) * 2000-06-14 2003-12-18 Voest Alpine Ind Anlagen Vorrichtung und verfahren zur behandlung eines kohlenwasserstoffhaltigen abfallstoffes
CN100421806C (zh) * 2004-01-02 2008-10-01 宝钢集团上海梅山有限公司 一种铁鳞除杂系统及工艺
TWI639805B (zh) * 2014-11-18 2018-11-01 南韓商波斯可公司 燒結設備及燒結方法
KR102031314B1 (ko) * 2017-12-26 2019-10-11 주식회사 포스코 소결광 냉각기
EP4172291B1 (en) 2020-06-25 2024-03-27 amaTEQ Holding GmbH Treatment of mill scale containing hydrocarbons

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3346417A (en) * 1963-08-06 1967-10-10 Int Alloys Ltd Method of and apparatus for treating metal scrap, particles or the like contaminatedwith volatile and/or combustible substances
BE791496A (fr) * 1971-11-17 1973-03-16 Metallgesellschaft Ag Procede de combustion d'hydrocarbures et de produits de decomposition dans les gaz de frittage residuaires
US3869112A (en) * 1973-09-18 1975-03-04 Wabash Alloys Inc Method and apparatus for melting metals, especially scrap metals
US4091545A (en) * 1975-03-08 1978-05-30 Nippon Kokan Kabushiki Kaisha Method for removing water and grease deposit from rolling mill sludge
US4201370A (en) * 1978-07-10 1980-05-06 College Research Corporation Method and apparatus for heat treating materials to remove contaminants
CA1160457A (en) * 1980-06-06 1984-01-17 Takasaburo Date Method for preheating steel scrap by exhaust gas from steelmaking electric furnace
NL188101C (nl) * 1981-05-18 1992-04-01 Stevin Wegenbouw Inrichting voor het behandelen van met giftige bestanddelen verontreinigd bodemmateriaal.
DE3524902A1 (de) * 1985-07-12 1987-01-15 Zueblin Ag Verfahren zur thermischen aufarbeitung von mit organischen verbindungen verunreinigten mineralischen stoffen und vorrichtung zur durchfuehrung des verfahrens
DE3543845A1 (de) * 1985-12-12 1987-06-19 Ruetgerswerke Ag Verfahren zum dekontaminieren von boeden
DE3924074A1 (de) * 1989-07-20 1991-01-24 Kettenbauer Gmbh & Co Verfahre Vorrichtung zur thermischen behandlung eines aus thermisch abbaubaren und thermisch bestaendigen stoffen zusammengesetzten materials

Also Published As

Publication number Publication date
EP0446779A3 (de) 1991-10-16
DE59102782D1 (de) 1994-10-13
EP0446779A2 (de) 1991-09-18
JPH0777390A (ja) 1995-03-20
DE4008027C1 (enrdf_load_stackoverflow) 1991-05-23

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