EP0446779A2 - Procédé et installation de traitement d'écailles de lamination contenant de l'huile et matériaux similaires - Google Patents

Procédé et installation de traitement d'écailles de lamination contenant de l'huile et matériaux similaires Download PDF

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Publication number
EP0446779A2
EP0446779A2 EP19910103449 EP91103449A EP0446779A2 EP 0446779 A2 EP0446779 A2 EP 0446779A2 EP 19910103449 EP19910103449 EP 19910103449 EP 91103449 A EP91103449 A EP 91103449A EP 0446779 A2 EP0446779 A2 EP 0446779A2
Authority
EP
European Patent Office
Prior art keywords
oil
mill scale
furnace
continuous furnace
exhaust air
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.)
Granted
Application number
EP19910103449
Other languages
German (de)
English (en)
Other versions
EP0446779B1 (fr
EP0446779A3 (fr
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
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 Preussag Stahl AG filed Critical Preussag Stahl AG
Publication of EP0446779A2 publication Critical patent/EP0446779A2/fr
Publication of EP0446779A3 publication Critical patent/EP0446779A3/fr
Application granted granted Critical
Publication of EP0446779B1 publication Critical patent/EP0446779B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
    • B09B—DISPOSAL OF SOLID WASTE NOT OTHERWISE PROVIDED FOR
    • B09B3/00—Destroying solid waste or transforming solid waste into something useful or harmless
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
    • B09B—DISPOSAL OF SOLID WASTE NOT OTHERWISE PROVIDED FOR
    • B09B2101/00—Type of solid waste
    • B09B2101/02—Gases or liquids enclosed in discarded articles, e.g. aerosol cans or cooling systems of refrigerators

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, but complete deoiling is not possible here. 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 for sintering, not only does the water evaporate, but at least some of the oil escapes unburned.
  • Some of the oily components in today's electrostatic precipitators which have the task of condensing the flue gases of the sintering plant to clean dust from legally stipulated minimum levels. If organic material in the flue gas is exposed to high loads, fires or, in the limit case, explosions can also occur in the filter, which is easily caused by electrical flashovers between the spray and precipitation electrodes of the electrostatic precipitator. Condensed oil components make cleaning the precipitation electrodes more difficult, and undeposited oil 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 often occur, 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.
  • 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 plant 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, in part 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. 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 according to the heat and quantity ratios of mill scale / iron ore mixture and thus gets 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, however, but are removed 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 to stop the flow of wet mill scale to the continuous furnace when 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 contained in the mix is ignited by ignition gas.
  • the sinter cake is crushed through a sting crusher 4 and into the sinter cooler 5, to which cooling air is fed via a blower 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 blower 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, passes from the continuous furnace 12 into a dust separator 13 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 supplies the ignition furnace 3 with residual, volatile oil as further fuel.
  • Blast gas from a line 18 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 and other control devices of the sintering plant can work together via a computer to produce optimal process conditions.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Geology (AREA)
  • Manufacturing & Machinery (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Materials Engineering (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • General Engineering & Computer Science (AREA)
  • Manufacture And Refinement Of Metals (AREA)
EP19910103449 1990-03-10 1991-03-07 Procédé et installation de traitement d'écailles de lamination contenant de l'huile et matériaux similaires Expired - Lifetime EP0446779B1 (fr)

Applications Claiming Priority (2)

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

Publications (3)

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

Family

ID=6402111

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19910103449 Expired - Lifetime EP0446779B1 (fr) 1990-03-10 1991-03-07 Procédé et installation de traitement d'écailles de lamination contenant de l'huile et matériaux similaires

Country Status (3)

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

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1995018940A1 (fr) * 1994-01-07 1995-07-13 Bethlehem Steel Corporation Procede et appareil pour bruler les dechets d'acieries
WO2001096249A1 (fr) * 2000-06-14 2001-12-20 Voest-Alpine Industrieanlagenbau Gmbh & Co. Dispositif et procede pour traiter des dechets contenant des hydrocarbures
EP3222953A4 (fr) * 2014-11-18 2018-01-17 Posco Appareil de frittage et procédé de frittage
WO2021260181A1 (fr) 2020-06-25 2021-12-30 Amateq Holding Gmbh Traitement de calamine contenant des hydrocarbures

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT405530B (de) * 1996-07-11 1999-09-27 Voest Alpine Ind Anlagen Verfahren zur thermischen behandlung von organisch belasteten materialien
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
KR102031314B1 (ko) * 2017-12-26 2019-10-11 주식회사 포스코 소결광 냉각기

Citations (6)

* 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
US3857694A (en) * 1971-11-17 1974-12-31 Metallgesellschaft Ag Process for burning hydrocarbons and cracked products in exhaust gases from sintering machines
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
GB2025589A (en) * 1978-07-10 1980-01-23 College Research Corp Method and apparatus for heat treating materials to remove contaminants
GB2078917A (en) * 1980-06-06 1982-01-13 Toshin Steel Co Method for preheating steel scrap by exhaust gas from steelmaking electric furnace

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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

Patent Citations (6)

* 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
US3857694A (en) * 1971-11-17 1974-12-31 Metallgesellschaft Ag Process for burning hydrocarbons and cracked products in exhaust gases from sintering machines
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
GB2025589A (en) * 1978-07-10 1980-01-23 College Research Corp Method and apparatus for heat treating materials to remove contaminants
GB2078917A (en) * 1980-06-06 1982-01-13 Toshin Steel Co Method for preheating steel scrap by exhaust gas from steelmaking electric furnace

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1995018940A1 (fr) * 1994-01-07 1995-07-13 Bethlehem Steel Corporation Procede et appareil pour bruler les dechets d'acieries
WO2001096249A1 (fr) * 2000-06-14 2001-12-20 Voest-Alpine Industrieanlagenbau Gmbh & Co. Dispositif et procede pour traiter des dechets contenant des hydrocarbures
US6996918B2 (en) 2000-06-14 2006-02-14 Voest - Alpine Industrieanlagenbau Gmbh & Co. Device and method for treating a refuse material containing hydrocarbons
KR100769598B1 (ko) * 2000-06-14 2007-10-23 지멘스 브이에이아이 메탈스 테크놀로지스 게엠베하 앤드 컴퍼니 탄화수소 함유 폐기물의 처리 장치 및 처리 방법
EP3222953A4 (fr) * 2014-11-18 2018-01-17 Posco Appareil de frittage et procédé de frittage
WO2021260181A1 (fr) 2020-06-25 2021-12-30 Amateq Holding Gmbh Traitement de calamine contenant des hydrocarbures

Also Published As

Publication number Publication date
JPH0777390A (ja) 1995-03-20
DE4008027C1 (fr) 1991-05-23
EP0446779B1 (fr) 1994-09-07
DE59102782D1 (de) 1994-10-13
EP0446779A3 (fr) 1991-10-16

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