EP0275816B1 - Procédé pour le traitement des déchets d'acier finement divisés - Google Patents
Procédé pour le traitement des déchets d'acier finement divisés Download PDFInfo
- 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
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)
- 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.
- Procédé selon la revendication 1,
caractérisé en ce que la pression de pressage est maintenue dans la plage de 270 à 330 N/mm². - 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. - 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. - 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. - 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. - 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. - Procédé selon la revendication 6 ou 7,
caractérisé en ce que la réduction en fragments est effectuée par des cylindres broyeurs.
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)
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)
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)
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 |
-
1987
- 1987-12-11 EP EP87730164A patent/EP0275816B1/fr not_active Expired - Lifetime
- 1987-12-11 DE DE8787730164T patent/DE3777144D1/de not_active Expired - Fee Related
- 1987-12-11 AT AT87730164T patent/ATE73170T1/de not_active IP Right Cessation
Cited By (1)
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 |
---|---|
EP0275816A1 (fr) | 1988-07-27 |
ATE73170T1 (de) | 1992-03-15 |
DE3777144D1 (de) | 1992-04-09 |
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 | |
DE60129451T2 (de) | Herstellung einer briquette als material zur stahlherstellung | |
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 | |
EP2809461B1 (fr) | Dispositif et procédé de fabrication de profilés sans pores à partir de restes de matière enlevée au moyen d'extrudeuses | |
DE4432721A1 (de) | Verfahren zur Herstellung von eisenhaltigen Briketts | |
DE3244471A1 (de) | Verfahren fuer die herstellung von festem hochofenkoks | |
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 | |
DE69200041T2 (de) | Verfahren zur Behandlung stark umweltschädlicher Abfallstoffe. | |
DE2757402B2 (de) | Verfahren zum Schmelzen von Aluminiumabfällen | |
DE19522064A1 (de) | Verfahren und Vorrichtung zum Wiedergewinnen von Metallen aus Elektronikschrott | |
EP1362647B1 (fr) | Procédé et dispositif pour le traitement de déchets | |
DE102021126267A1 (de) | Verfahren zur thermischen Behandlung und Kompaktierung von kohlenstoffhaltige Verunreinigungen aufweisenden Feinglasscherben, Filterfeinstäuben und Sekundärrohstoffen | |
DE3513733C2 (de) | Verfahren zur Aufbereitung von eisenhaltigen, feinkörnigen Abgängen mit Legierungselementen, z.B. Chrom in sechswertiger Oxydationsstufe, insbesondere im Filterstaub und/oder im Filterschlamm, der Stahl-, insbesondere der Elektrostahlherstellung | |
DE10300443B4 (de) | Verfahren zur Herstellung von körnigem Packungsmaterial für die Verwendung beim Brennen von Anoden | |
EP1279715A1 (fr) | Procédé de liaison des substances non polaires |
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 |