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WO1998040523A1 - Agglomerat pour l'alimentation de hauts fourneaux - Google Patents

Agglomerat pour l'alimentation de hauts fourneaux Download PDF

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Publication number
WO1998040523A1
WO1998040523A1 PCT/EP1998/001470 EP9801470W WO9840523A1 WO 1998040523 A1 WO1998040523 A1 WO 1998040523A1 EP 9801470 W EP9801470 W EP 9801470W WO 9840523 A1 WO9840523 A1 WO 9840523A1
Authority
WO
WIPO (PCT)
Prior art keywords
agglomerate
metal
mill scale
mass
fine material
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.)
Ceased
Application number
PCT/EP1998/001470
Other languages
German (de)
English (en)
Inventor
Hansdieter Sütterlin
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.)
Individual
Original Assignee
Individual
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
Priority claimed from DE1997112042 external-priority patent/DE19712042C1/de
Priority claimed from DE29706832U external-priority patent/DE29706832U1/de
Application filed by Individual filed Critical Individual
Publication of WO1998040523A1 publication Critical patent/WO1998040523A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

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
    • C22B1/242—Binding; Briquetting ; Granulating with binders
    • C22B1/243—Binding; Briquetting ; Granulating with binders inorganic
    • 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
    • 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
    • C22B7/00—Working up raw materials other than ores, e.g. scrap, to produce non-ferrous metals and compounds thereof; Methods of a general interest or applied to the winning of more than two metals
    • C22B7/001—Dry processes
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/20—Recycling

Definitions

  • the invention relates to an agglomerate for use as a blast furnace feedstock from a powdery to coarse-grained metal or metal oxide-containing fine material and a mineral binder which is hardened by thermal treatment.
  • the invention relates to an agglomerate of scale produced in rolling mills, in particular oil-containing scale scale.
  • mill scale into agglomerates which can be fed to a blast furnace process as iron or iron oxide carriers, is of particular importance because of the large quantities of mill scale that arise.
  • mill scale which is preferably fed to an iron and steel extraction process in order to recover its iron content.
  • the object of the invention is therefore to create an agglomerate of a powdery to coarse-grained metal or metal oxide-containing fine material, in particular mill scale, which has good abrasion and pressure resistance and at the same time contains only a minimum of accompanying elements.
  • the hydrocarbon-enriched fine sludge which is produced in the steel rolling process and in the steel processing industry and has previously been deposited, can be agglomerated in this way and then recycled. Organic components contained are destroyed by the thermal hardening process, so that the agglomerates also meet the purity requirement.
  • the invention relates to an agglomerate 1 with a proportion of more than 90% by mass of a metal or metal oxide-containing fine material and a silicate mineral sinter matrix in a structure of fine material particles of the fine material, which are embedded in a glassy solidified silicate melt with mineral excretion, and a porosity from 20 to 50 vol% of the total volume, the proportion of open porosity of which is 75 to 95%.
  • the structure of the agglomerates 1 is characterized by a glassy solidified silicate melt with mineral precipitation, which forms molten skins around the mill scale particles as well as fusible links between the mill scale particles, which leads to a reliable compacting of the mill scale grains.
  • the agglomerate 1 is accordingly sintered via a silicate melt.
  • the mineral excretion is preferably primary mullite. Even after wet sintering, the agglomerate 1 therefore has a pore fraction in the total volume of 20 to 50% by volume, in particular 35 to 45% by volume, more than 60% of this porosity being formed by an open porosity.
  • the proportion of open porosity is between 75 and 95%.
  • the shape of the agglomerate 1 can be selected and can take on flat or rounded shapes, the agglomerate 1 having square or rectangular bottom surfaces with a width B and a length L.
  • the agglomerate 1 is preferably given a stamping or piercing body shape with a crater depth 2 on the head side by means of a shaping process.
  • the crater depth 2 can account for up to 70% of the total height of the body shape. Crater depths 2 of 50 to 60% of the total height are preferred.
  • the crater depth 2 can have funnel widths of 50 to 80% of the diameter or the length L of the agglomerate 1.
  • the crater depth 2 is also preferably formed centrally on the agglomerate 1 so that the agglomerate 1 has wall thicknesses that are as uniform as possible.
  • Such a shape has a larger body surface and causes a change in the core tension, so that core cracks occur less frequently. Such a body shape also shortens the thermal treatment required.
  • Agglomerates of a metal or metal oxide-containing fine material and a mineral binder are produced by mixing the fine material with a raw material containing clay minerals to form a mass, forming individual mass bodies and solidifying them to form an agglomerate.
  • the fine material is preferably obtained in rolling mills the tinder, especially the oil-containing roller tinder.
  • the mill scale to be agglomerated can be added with particle sizes in the fine to coarse range, with up to 50% by mass in the range between 1 and 10 mm.
  • the mill scale can also be added up to 90% as a powdery fine material, ie with grain sizes down to: 100 ⁇ m.
  • the mill scale 90 to 98 Ma of the mill scale are mixed with 2 to 10 Ma% of a raw material containing clay minerals in the grain size 0.5 ⁇ m to 200 ⁇ m with setting a mass moisture of 6 to 20% to a doughy mass.
  • the desired moisture content can be adjusted depending on the moisture content of the metallic or metal oxide fines, possibly its oil content, as well as the moisture content of the clay mineral raw material by removing or adding water.
  • the mill scale is generally in a sturdy, gritty / muddy, at least grain-digested form.
  • the proportion of mill scale in the batch can be partially replaced by another metal-containing fine material, such as, in particular, metallic grinding dust or chips.
  • the clay mineral-containing raw material is preferably added in very fine-grained form, in particular in the grain sizes 0.5 ⁇ m to 80 ⁇ m, with 50 to 80% of the proportion of the clay mineral-containing raw material preferably being added in the grain size between 20 and 60 ⁇ m. Furthermore, the clay mineral-containing raw material is preferably added with an essentially continuous grain size distribution.
  • the clay mineral-containing raw material preferably contains one or more two- and / or three-layer clay minerals as the main constituent. Clays whose cation exchange capacity is increased due to an at least low degree of diagenesis are preferred as two-layer clay minerals.
  • the mixture of mill scale and clay mineral raw material can 0.3 up to 1.5% by mass of additional solidifying agents, such as inorganic thickeners, in particular water glass, sugar solution, aluminum chromate or a phosphate, can be added. Minor proportions, preferably up to 0.5% by mass, of organic additives, in particular molasses, can also be added.
  • additional solidifying agents such as inorganic thickeners, in particular water glass, sugar solution, aluminum chromate or a phosphate
  • Minor proportions, preferably up to 0.5% by mass, of organic additives, in particular molasses, can also be added.
  • a further additive to lower the hardening temperature are low-melting silicate substances, such as, in particular, a glass powder or phonolite, which can replace the clay-mineral-containing raw material by up to 10 to 40% of its proportion when mixed with mill scale.
  • the mixing of the batch into a doughy mass, in which the incorporated air is generally distributed over the smallest gas bubbles, is preferably carried out by means of a twin-shaft mixer.
  • the mass is transported in blocks to a cutting tool, which divides the mass blocks into individual mass bodies, which are then hardened. The mass is not compressed at all or only slightly when it is transported in blocks.
  • the mass is preferably transported in blocks using a piston press which is only subjected to low pressures.
  • the applied pressures are between 0.4 and 2.5 MPa.
  • An outlet nozzle of the piston press can divide the mass transported in blocks into individual lengths, from which individual mass bodies can be sheared off.
  • the mass transported in blocks can be ejected in Hubein and then stamped and / or embossed. drive through.
  • the individual mass bodies are then thermally treated with a residual moisture content of greater than or equal to 3%.
  • the mass bodies are preferably brought directly into a firing unit without drying.
  • the thermal treatment serves to harden the mass bodies to form agglomerates, the hardening preferably being based on a sintering process with the formation of a silicate sintering matrix which has a glass phase and optionally a crystalline phase, in particular an ullitic phase.
  • the silicate sintered matrix is then a glassy matrix in which crystalline particles are embedded, which are preferably a primary material.
  • the hardening process is preferably carried out by means of a thermal treatment at temperatures between 800 and 1200 ° C and a holding time of less than 90 min, so that the clay mineral-containing raw material can form a melting phase, which preferably consists of a glassy solidified sintered matrix with a crystalline fraction, in particular granular mullite or Primary mullite, in which the mill scale particles are embedded.
  • the mass bodies are preferably fed directly to this baking firing, so that the heating phase lies in the initial phase of the baking firing. During this initial phase of the cooking or sintering firing, the mass bodies are given an outer, stable crust which leads to such inherent stability that the mass bodies can even be fired in a roller furnace.
  • metal powder, metallic grinding dusts and / or metal chips are used as the metal or metal oxide-containing fine material, which preferably mixes fine-grained with the mineral binder and are processed into agglomerates as described above.
  • fine material containing metal or metal oxide is mill scale
  • coarse and medium-grain mill scale particles form indentations in the structure of the agglomerate, which are partially melted.
  • a finely crystalline support matrix or a support structure in the sintered matrix has been created by collective crystallization of fine-grained mill scale particles, which leads to a further increase in the mechanical strength of the agglomerate.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Geology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Environmental & Geological Engineering (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Inorganic Chemistry (AREA)
  • Compositions Of Oxide Ceramics (AREA)
  • Manufacture And Refinement Of Metals (AREA)

Abstract

L'invention concerne un agglomérat formé à partir d'une matière utilisé pour l'alimentation de hauts fourneaux et constitué de fines pulvérulentes ou à gros grains contenant du métal ou de l'oxyde métallique présentant une bonne résistance à l'abrasion et à la pression. A cet effet, il est prévu un agglomérat avec une proportion de plus de 90 % en poids de fines contenant du métal ou de l'oxyde métallique et une matrice de frittage minérale de silicate dans une structure composée de particules fines enrobées dans une matière fondue de silicate figée à l'état vitreux avec dépôts minéraux, la porosité représentant de 20 à 50 % en volume du volume total avec une porosité ouverte comprise entre 75 et 95 %.
PCT/EP1998/001470 1997-03-13 1998-03-13 Agglomerat pour l'alimentation de hauts fourneaux Ceased WO1998040523A1 (fr)

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
DE19710279 1997-03-13
DE19710279.4 1997-03-13
DE1997112042 DE19712042C1 (de) 1997-03-13 1997-03-21 Agglomerat zur Verwendung als Hochofeneinsatzstoff
DE19712042.3 1997-03-21
DE29706832.6 1997-04-16
DE29706832U DE29706832U1 (de) 1997-03-13 1997-04-16 Agglomerat

Publications (1)

Publication Number Publication Date
WO1998040523A1 true WO1998040523A1 (fr) 1998-09-17

Family

ID=27217211

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP1998/001470 Ceased WO1998040523A1 (fr) 1997-03-13 1998-03-13 Agglomerat pour l'alimentation de hauts fourneaux

Country Status (1)

Country Link
WO (1) WO1998040523A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102009005604A1 (de) 2009-01-21 2010-07-29 Rhm Rohstoff-Handelsgesellschaft Mbh Walzenzunderbrikettierung
DE102010031888A1 (de) 2010-07-21 2012-01-26 Rhm Rohstoff-Handelsgesellschaft Mbh Walzenzunderbrikettierung

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2823687A1 (de) * 1978-05-31 1979-12-06 Solmet Alloys Legierungszusatz fuer legierungen von nichteisenmetallen und verfahren zu dessen herstellung
JPS61243132A (ja) * 1985-04-19 1986-10-29 Nippon Steel Corp 焼結原料用バインダ−
DE3700382A1 (de) * 1987-01-08 1988-07-21 Helmut Dipl Ing Pieper Verfahren zum aufschaeumen von glasbildenden mineralischen stoffen, insbesondere abfallstoffen wie flugaschen, schlick, kiesschlamm, flotationsrueckstaenden, muellaschen etc.
SU1652366A1 (ru) * 1988-11-09 1991-05-30 Научно-Исследовательский И Проектный Институт Обогащения И Механической Обработки Полезных Ископаемых "Уралмеханобр" Офлюсованный железорудный окатыш
RU2055919C1 (ru) * 1993-12-16 1996-03-10 Евгений Ефимович Агеев Способ брикетирования стальной окалины, являющейся отходом металлургического производства
DE19629099A1 (de) * 1996-06-25 1998-01-02 Anton Grehl Verfahren zur Herstellung eines keramischen Formkörpers

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2823687A1 (de) * 1978-05-31 1979-12-06 Solmet Alloys Legierungszusatz fuer legierungen von nichteisenmetallen und verfahren zu dessen herstellung
JPS61243132A (ja) * 1985-04-19 1986-10-29 Nippon Steel Corp 焼結原料用バインダ−
DE3700382A1 (de) * 1987-01-08 1988-07-21 Helmut Dipl Ing Pieper Verfahren zum aufschaeumen von glasbildenden mineralischen stoffen, insbesondere abfallstoffen wie flugaschen, schlick, kiesschlamm, flotationsrueckstaenden, muellaschen etc.
SU1652366A1 (ru) * 1988-11-09 1991-05-30 Научно-Исследовательский И Проектный Институт Обогащения И Механической Обработки Полезных Ископаемых "Уралмеханобр" Офлюсованный железорудный окатыш
RU2055919C1 (ru) * 1993-12-16 1996-03-10 Евгений Ефимович Агеев Способ брикетирования стальной окалины, являющейся отходом металлургического производства
DE19629099A1 (de) * 1996-06-25 1998-01-02 Anton Grehl Verfahren zur Herstellung eines keramischen Formkörpers

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
DATABASE WPI Section Ch Week 9210, Derwent World Patents Index; Class M24, AN 92-077721, XP002066444 *
DATABASE WPI Section Ch Week 9649, Derwent World Patents Index; Class M24, AN 96-496174, XP002066443 *
PATENT ABSTRACTS OF JAPAN vol. 011, no. 089 (C - 411) 19 March 1987 (1987-03-19) *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102009005604A1 (de) 2009-01-21 2010-07-29 Rhm Rohstoff-Handelsgesellschaft Mbh Walzenzunderbrikettierung
DE102010031888A1 (de) 2010-07-21 2012-01-26 Rhm Rohstoff-Handelsgesellschaft Mbh Walzenzunderbrikettierung
WO2012010254A1 (fr) 2010-07-21 2012-01-26 Rhm Rohstoff-Handelsgesellschaft Mbh Procédé de briquetage de battitures de laminoir

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