EP0275816B1 - Procédé pour le traitement des déchets d'acier finement divisés - Google Patents

Procédé pour le traitement des déchets d'acier finement divisés Download PDF

Info

Publication number
EP0275816B1
EP0275816B1 EP87730164A EP87730164A EP0275816B1 EP 0275816 B1 EP0275816 B1 EP 0275816B1 EP 87730164 A EP87730164 A EP 87730164A EP 87730164 A EP87730164 A EP 87730164A EP 0275816 B1 EP0275816 B1 EP 0275816B1
Authority
EP
European Patent Office
Prior art keywords
pressed bodies
process according
drying
steel
moisture content
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
EP87730164A
Other languages
German (de)
English (en)
Other versions
EP0275816A1 (fr
Inventor
Ingo Dr. Ing. Von Hagen
Axel Dr.-Ing. Kulgemeyer
Klaus Pillmayer
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.)
Vodafone GmbH
Original Assignee
Mannesmann 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 Mannesmann AG filed Critical Mannesmann AG
Priority to AT87730164T priority Critical patent/ATE73170T1/de
Publication of EP0275816A1 publication Critical patent/EP0275816A1/fr
Application granted granted Critical
Publication of EP0275816B1 publication Critical patent/EP0275816B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

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
    • C22B1/24—Binding; Briquetting ; Granulating
    • C22B1/248—Binding; Briquetting ; Granulating of metal scrap or alloys

Definitions

  • the invention relates to a method for the treatment of finely divided steel waste from ablative steel processing as a raw material for steel production.
  • the fine-particle steel waste is fine chips, e.g. from milling or turning (length less than approx. 30 mm, diameter less than 3 mm), especially around metallic dusts from grinding. These waste materials have so far been collected, but due to their poor manageability due to their fine particle size and low density, they are often not recycled, but instead disposed of in landfills.
  • the object of the invention is therefore to provide a method for the treatment of finely divided steel wastes, in particular chips and / or grinding dusts, with which a reuse of these wastes for steel production is made possible in a simple and inexpensive manner.
  • the invention is based on the one hand on the knowledge that the finely divided steel waste is suitable in terms of material composition for steel production in a manner similar to scrap, since hardly any reduction in iron oxides is required and a pure iron content of at least 90 percent by weight (based on the solids content) is generally ensured is.
  • the usability of finely divided steel waste depends in particular on the handling options.
  • the finely divided steel waste without any kind of pretreatment such as crushing, centrifuging and drying, is first, for example in a conventional stamp press at a pressure between 200 and 400 N / mm2 to form solids (compacts) with a density of at least 2.5 g / cm3 are compressed, the solids produced have a size of at least 1 cm3.
  • the upper curve shown in FIG. 1 shows how the density increases with an increasing pressing pressure in an exemplary batch of finely divided steel waste.
  • the pressing pressure should not exceed 400 N / mm2 and the size of the compact should not exceed 2000 cm3, because the required press becomes more expensive with increasing pressing pressure and increasing compact volume with an increase in the required pressing pressure or with an uneven density and decreasing mechanical Strength inside the compact as a result of aligning the chips is connected.
  • the pressure and the geometry of the compact are coordinated so that the compact not only has a green strength of at least 300 N / mm2, but also does not exceed a moisture content of 10 percent by weight.
  • the moisture content of the compacts produced according to the invention is generally in the range from about 3 to max.
  • the starting material is already largely dried out without the need for an energy-intensive separate dehumidification or drying step.
  • This relationship is again shown in FIG. 2 on the basis of an exemplary batch of steel waste.
  • the residual moisture of the compact after pressing is only about 4 to 5% of the moisture originally present in the starting material at a pressing pressure above 250 N / mm2 and is hardly reduced by further pressure increase.
  • the compacts are already ready for melting, e.g. in an electric furnace.
  • a molten metal e.g. in a converter
  • Drying of the compacts is preferably carried out in such a way that the compacts are exposed to a hot gas stream (e.g. air), the temperature of which should not exceed 300 ° C., if possible, in order to avoid subsequent oxidation of the finely divided steel waste.
  • a hot gas stream e.g. air
  • the lower curve in Fig. 1 shows how an additional drying reduces the density as a function of the pressing pressure of the compact production.
  • the green strength (compressive strength) of the compact which is caused by the interlocking of the steel particles as a result of the pressing process, increases, as shown in FIG. 3, initially increases sharply with increasing pressing pressure from approximately 150 N / mm2 and reaches its maximum at approximately 270 N / mm2 before it falls off again.
  • a pressure in the range of 270 to 330 N / mm2 is accordingly to be regarded as particularly advantageous both with regard to the residual moisture content and with regard to the green strength.
  • the solids are initially produced from the steel waste as relatively large-area, plate-shaped compacts. This is advantageous for an economical execution of the pressing step, because, for example, the filling of the pressing mold can be done without any problems and the number of pressing operations is reduced.
  • a subsequent comminution step e.g. with the aid of a mandrel roller (crushing roller) can be carried out in a very simple manner, the compact is divided into smaller fragments, so that a relatively large surface area of the fragments is created, which is advantageous for rapid drying of the fragments.
  • the method according to the invention can be operated with particular advantage if there is the possibility of selecting the waste material to be processed differentiated according to material qualities, that is if the waste material has been deliberately recorded at the point of origin. As a result, the levels of copper, lead, tin or the like which are often undesirable in steel production can be minimized.
  • Another advantage of the method according to the invention is that it is particularly suitable to be carried out on a mobile press, that is to say arranged on a vehicle, since no additional units are required for pretreating the steel waste.
  • This makes disposal at the site of waste generation possible, which leads to a compact, salable treatment product without a (generally poorly used) treatment plant having to be permanently installed at the waste site.
  • the moisture content separated from the steel waste eg drilling fluid
  • a grinding dust batch with a chemical composition (percent by weight) was compressed with a pressure of 330 N / mm2 to a compact of 5 cm3 and a density of 3.31 g / cm3. After compaction, the moisture content had dropped to approx. 8% (based on the total weight). The compact was then exposed to a hot air flow of 200 degrees C for 30 seconds. As a result, the moisture content dropped to well below 1%.
  • the compact (green body) thus produced had a compressive strength of 768 N / mm2 and was therefore suitable for use as a scrap substitute in an electric furnace or a converter.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Geology (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Processing Of Solid Wastes (AREA)

Claims (8)

  1. Procédé pour le traitement de déchets d'acier, sous forme de copeaux et/ou de poussières de meulage, produits dans l'usinage de l'acier par enlèvement de matière, dans lequel des pièces pressées sans enrobage, ayant un volume d'au moins 1 cm³, sont créées par compression à froid, et l'humidité est extraite des déchets d'acier, les déchets d'acier humides étant comprimés, sans traitement préalable, en les pièces pressées, en utilisant une pression de pressage entre 200 et 400 N/mm², les pièces pressées atteignant une masse volumique d'au moins 2,5 g/cm³ pour une résistance du comprimé d'au moins 300 N/mm² et leur humidité résiduelle étant abaissée, par la compression, à moins de 10% en poids, et, après la compression, les pièces pressées étant soumises à un séchage dans un courant de gaz chaud.
  2. Procédé selon la revendication 1,
    caractérisé en ce que la pression de pressage est maintenue dans la plage de 270 à 330 N/mm².
  3. Procédé selon la revendication 1,
    caractérisé en ce que les pièces pressées présentent une masse volumique dans la plage de 2,5 à 4,5 g/cm³.
  4. Procédé selon la revendication 1, 2 où 3,
    caractérisé en ce que les pièces pressées sont soumises à un séchage à une humidité résiduelle inférieure à 1% en poids.
  5. Procédé selon la revendication 4,
    caractérisé en ce que le séchage est mené au-dessous de 300°C, en évitant toute oxydation, par le courant de gaz chaud.
  6. Procédé selon la revendication 4 ou 5,
    caractérisé en ce que, par la compression, on obtient des pièces pressées plates, qui sont réduites en fragments d'un volume supérieur à 1 cm³, avant le séchage.
  7. Procédé selon une des revendications 1 à 6,
    caractérisé en ce que la taille des pièces pressées est limitée à un volume de 2000 cm³.
  8. Procédé selon la revendication 6 ou 7,
    caractérisé en ce que la réduction en fragments est effectuée par des cylindres broyeurs.
EP87730164A 1986-12-19 1987-12-11 Procédé pour le traitement des déchets d'acier finement divisés Expired - Lifetime EP0275816B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT87730164T ATE73170T1 (de) 1986-12-19 1987-12-11 Verfahren zur aufbereitung von feinteiligen stahlabfaellen.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3644348 1986-12-19
DE3644348 1986-12-19

Publications (2)

Publication Number Publication Date
EP0275816A1 EP0275816A1 (fr) 1988-07-27
EP0275816B1 true EP0275816B1 (fr) 1992-03-04

Family

ID=6317135

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87730164A Expired - Lifetime EP0275816B1 (fr) 1986-12-19 1987-12-11 Procédé pour le traitement des déchets d'acier finement divisés

Country Status (3)

Country Link
EP (1) EP0275816B1 (fr)
AT (1) ATE73170T1 (fr)
DE (1) DE3777144D1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2593565C1 (ru) * 2015-02-24 2016-08-10 Федеральное государственное бюджетное образовательное учреждение высшего профессионального образования "Курский государственный университет" Способ брикетирования металлической стружки

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19538608C2 (de) * 1995-10-18 2001-09-20 Max Aicher Verfahren zum Erschmelzen von Schrott
RU2547368C2 (ru) * 2013-06-14 2015-04-10 Федеральное Государственное Унитарное Предприятие "Центральный Научно-Исследовательский Институт Конструкционных Материалов "Прометей" Фгуп "Цнии Км "Прометей" Способ брикетирования металлической стружки

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE346068C (fr) *
DE1119886B (de) * 1960-09-22 1961-12-21 Metallgesellschaft Ag Brikettieren von Eisenpellets
US3414408A (en) * 1966-05-17 1968-12-03 Walter W. Eichenberger Briquetting process
DE2151819C2 (de) * 1971-10-18 1974-10-24 Hutt Gmbh, 7105 Leingarten Verfahren zur Aufbereitung von feuchten Metallspänen zum Wiedereinschmelzen
US4260373A (en) * 1979-01-08 1981-04-07 Combustion Engineering, Inc. Method and apparatus for drying and preheating small metallic particles

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2593565C1 (ru) * 2015-02-24 2016-08-10 Федеральное государственное бюджетное образовательное учреждение высшего профессионального образования "Курский государственный университет" Способ брикетирования металлической стружки

Also Published As

Publication number Publication date
DE3777144D1 (de) 1992-04-09
EP0275816A1 (fr) 1988-07-27
ATE73170T1 (de) 1992-03-15

Similar Documents

Publication Publication Date Title
DE10103549B4 (de) Verfahren zur Verbesserung oder Aufbereitung von Braunkohle und mit dem Verfahren erhaltene Materialien
DE2321103C3 (de) Verfahren zur Herstellung eines phosphorhaltigen Stahlpulvers
EP2544997B1 (fr) Procédé pour la production d'un charbon activé avec une base
DE2531457B2 (de) Verfahren zum Aufbereiten von bei der Erzeugung von rostfreiem Stahl anfallenden Abfallstoffen
DE102009049015A1 (de) Verwendung von CuCr-Abfallspänen für die Herstellung von CuCr-Kontaktrohlingen
EP3077132B1 (fr) Procédé permettant de produire des billettes
DE2709278A1 (de) Sinter-traenkwerkstoff fuer elektrische kontaktstuecke und verfahren zu seiner herstellung
DE2619302A1 (de) Verfahren zum umwandeln von festen abfallstoffen in brenngas
EP0028341B1 (fr) Procédé de récupération de déchets produits lors de la fabrication et du travail de l'acier
EP0458172A2 (fr) Procédé pour la récupération d'agents gonflants et dispositif
EP0275816B1 (fr) Procédé pour le traitement des déchets d'acier finement divisés
DE4432721A1 (de) Verfahren zur Herstellung von eisenhaltigen Briketts
EP2809461A1 (fr) Dispositif et procédé de fabrication de profilés sans pores à partir de restes de matière enlevée au moyen d'extrudeuses
DE3244471A1 (de) Verfahren fuer die herstellung von festem hochofenkoks
DE2647933A1 (de) Verfahren und vorrichtung zur rueckgewinnung von magnesium
EP2152920B1 (fr) Procédé de fabrication de briquettes sans lian en copeaux métalliques et poussières métalliques
DE3344044A1 (de) Verfahren und vorrichtung zum verpressen von pulverfoermigen oder aehnlichen stoffen
EP1419114B1 (fr) Procede de traitement de boues
DE19522064A1 (de) Verfahren und Vorrichtung zum Wiedergewinnen von Metallen aus Elektronikschrott
EP1362647B1 (fr) Procédé et dispositif pour le traitement de déchets
DE2757402B2 (de) Verfahren zum Schmelzen von Aluminiumabfällen
DE102021126267A1 (de) Verfahren zur thermischen Behandlung und Kompaktierung von kohlenstoffhaltige Verunreinigungen aufweisenden Feinglasscherben, Filterfeinstäuben und Sekundärrohstoffen
DE10300443B4 (de) Verfahren zur Herstellung von körnigem Packungsmaterial für die Verwendung beim Brennen von Anoden
EP1279715A1 (fr) Procédé de liaison des substances non polaires
DE3608899A1 (de) Verfahren zur herstellung von metallurgischen, zusammengesetzten materialien

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AT BE CH DE FR LI NL

17P Request for examination filed

Effective date: 19880810

17Q First examination report despatched

Effective date: 19891006

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): AT BE CH DE FR LI NL

REF Corresponds to:

Ref document number: 73170

Country of ref document: AT

Date of ref document: 19920315

Kind code of ref document: T

ET Fr: translation filed
REF Corresponds to:

Ref document number: 3777144

Country of ref document: DE

Date of ref document: 19920409

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: AT

Effective date: 19921211

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: BE

Effective date: 19921231

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed
BERE Be: lapsed

Owner name: MANNESMANN A.G.

Effective date: 19921231

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: NL

Effective date: 19930701

NLV4 Nl: lapsed or anulled due to non-payment of the annual fee
PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Effective date: 19930831

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: CH

Payment date: 19941117

Year of fee payment: 8

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: LI

Effective date: 19951231

Ref country code: CH

Effective date: 19951231

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 19960111

Year of fee payment: 9

REG Reference to a national code

Ref country code: CH

Ref legal event code: PL

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Effective date: 19970902