DE102008038692B4 - Process and plant for the production of granulated blastfurnace slag and process for the production of cement - Google Patents
Process and plant for the production of granulated blastfurnace slag and process for the production of cement Download PDFInfo
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- DE102008038692B4 DE102008038692B4 DE102008038692A DE102008038692A DE102008038692B4 DE 102008038692 B4 DE102008038692 B4 DE 102008038692B4 DE 102008038692 A DE102008038692 A DE 102008038692A DE 102008038692 A DE102008038692 A DE 102008038692A DE 102008038692 B4 DE102008038692 B4 DE 102008038692B4
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- slag
- melt
- raw material
- cooled
- production
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- 239000002893 slag Substances 0.000 title claims abstract description 48
- 238000000034 method Methods 0.000 title claims abstract description 31
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 12
- 239000004568 cement Substances 0.000 title claims description 15
- 239000002994 raw material Substances 0.000 claims abstract description 15
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 12
- 238000000227 grinding Methods 0.000 claims abstract description 10
- 238000003723 Smelting Methods 0.000 claims abstract description 8
- 229910052742 iron Inorganic materials 0.000 claims abstract description 6
- 238000010309 melting process Methods 0.000 claims abstract description 6
- 239000000463 material Substances 0.000 claims abstract description 4
- 230000000717 retained effect Effects 0.000 claims abstract description 3
- 238000002844 melting Methods 0.000 claims abstract 2
- 239000002184 metal Substances 0.000 claims abstract 2
- 229910052751 metal Inorganic materials 0.000 claims abstract 2
- 238000010791 quenching Methods 0.000 claims abstract 2
- 230000000171 quenching effect Effects 0.000 claims abstract 2
- 239000000155 melt Substances 0.000 claims description 14
- 238000001816 cooling Methods 0.000 claims description 6
- 239000000446 fuel Substances 0.000 claims description 5
- 239000004576 sand Substances 0.000 claims description 4
- 239000000470 constituent Substances 0.000 claims description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 2
- 230000008018 melting Effects 0.000 abstract 1
- 229910000805 Pig iron Inorganic materials 0.000 description 6
- 238000002485 combustion reaction Methods 0.000 description 5
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 3
- 239000007789 gas Substances 0.000 description 3
- 239000000047 product Substances 0.000 description 3
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 2
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 2
- 239000000654 additive Substances 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 229910001018 Cast iron Inorganic materials 0.000 description 1
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 1
- 239000006004 Quartz sand Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 235000012255 calcium oxide Nutrition 0.000 description 1
- 239000000292 calcium oxide Substances 0.000 description 1
- 150000004649 carbonic acid derivatives Chemical class 0.000 description 1
- 239000000571 coke Substances 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B3/00—General features in the manufacture of pig-iron
- C21B3/04—Recovery of by-products, e.g. slag
- C21B3/06—Treatment of liquid slag
- C21B3/08—Cooling slag
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B5/00—Treatment of metallurgical slag ; Artificial stone from molten metallurgical slag
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B7/00—Hydraulic cements
- C04B7/14—Cements containing slag
- C04B7/147—Metallurgical slag
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B5/00—Making pig-iron in the blast furnace
- C21B5/04—Making slag of special composition
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B2400/00—Treatment of slags originating from iron or steel processes
- C21B2400/02—Physical or chemical treatment of slags
- C21B2400/022—Methods of cooling or quenching molten slag
- C21B2400/024—Methods of cooling or quenching molten slag with the direct use of steam or liquid coolants, e.g. water
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B2400/00—Treatment of slags originating from iron or steel processes
- C21B2400/02—Physical or chemical treatment of slags
- C21B2400/022—Methods of cooling or quenching molten slag
- C21B2400/026—Methods of cooling or quenching molten slag using air, inert gases or removable conductive bodies
-
- 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
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/10—Production of cement, e.g. improving or optimising the production methods; Cement grinding
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Structural Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Metallurgy (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
- Furnace Details (AREA)
- Manufacture And Refinement Of Metals (AREA)
Abstract
Verfahren zur Herstellung von Hüttensand, der durch Abschrecken und Aufmahlen von Schlacke entsteht, die in einem reduzierend betriebenen Schmelzprozess mit metallischer Schmelze anfällt, dadurch gekennzeichnet, dass a) dem Schmelzprozess als Rohmaterial in erster Linie nicht Eisenerz, sondern schlackenbildendes Rohmaterial zugeführt wird b) und dass als Hauptprodukt des Schmelzprozesses die Schlacke abgezogen wird, c) während die metallische Schmelze weitgehend erhalten bleibt d) und eventuell auftretende kleinere Schmelzverluste oder Schmelzüberschüsse durch geeignete Materialzufuhr bzw. -abfuhr ausgeglichen werden.Process for the production of blastfurnace slag resulting from the quenching and grinding of slag obtained in a reduced melting metal smelting process, characterized in that a) the raw material is fed to the smelting process not primarily iron ore but slag-forming raw material that the main product of the melting process, the slag is withdrawn, c) while the metallic melt is largely retained d) and possibly occurring smaller melt losses or melt excesses are compensated by suitable material supply or removal.
Description
Beim bekannten Hochofenprozess wird Eisen durch Reduktion von Eisenoxid gewonnen. Hierzu werden neben oxidischen Eisenerzen Koks und Zuschlagstoffe, wie Quarzsand und gebrannter Kalk, zur Reaktion gebracht. Roheisen und schwimmende Schlacke werden getrennt aus dem Hochofen abgezogen.In the known blast furnace process iron is obtained by reduction of iron oxide. Coke and aggregates, such as quartz sand and quick lime, are reacted in addition to oxidic iron ores. Cast iron and floating slag are extracted separately from the blast furnace.
Die im Hochofenprozess neben dem Roheisen gleichzeitig entstehende Schlacke wird nach Abzug aus dem Hochofen abgeschreckt und in einer Schlackenmahlanlage aufgemahlen (vgl. etwa http://de.wikipedia.org/wiki/Hochofenprozess). Der so gewonnene Hüttensand findet dann (neben Klinker) als Bestandteil von Zement Verwendung.The slag produced simultaneously in the blast furnace process next to the pig iron is quenched after deduction from the blast furnace and ground in a slag grinding plant (see, for example, http://de.wikipedia.org/wiki/Hochofenprozess). The obtained granulated slag sand then (in addition to clinker) as a component of cement use.
Bekannt ist auch ein Verfahren zum Erzeugen von Roheisen und einer unmittelbar als Zement verwendbaren Schlacke im Hochofen. Hierbei wird der Wind bei Führung einer hoch kalkhaltigen oder einer hoch tonerdehaltigen Schlacke mit Sauerstoff angereichert (
Es ist weiterhin bekannt, eine aus dem Hochofen kommende Schmelze in Roheisen und Schlacke zu trennen und die Schlacke nach Zugabe eines Zusatzstoffes zu verdüsen (
Nun ist der Hochofenprozess im Hinblick auf die Gewinnung von Roheisen optimiert, während die Schlacke ein Neben- bzw. Abfallprodukt des Hochofenprozesses darstellt, das zudem nur in begrenzten Mengen anfällt.Now, the blast furnace process is optimized with regard to the extraction of pig iron, while the slag is a by-product or waste product of the blast furnace process, which is also obtained only in limited quantities.
Der aus der Schlacke gewonnene Hüttensand ist andererseits ein wichtiger Bestandteil von Zementen. Eine Vergrößerung dieses Bestandteiles im Zement wäre aus verschiedenen Gründen sinnvoll und anzustreben.On the other hand, the slag sand obtained from slag is an important component of cements. An enlargement of this component in the cement would be useful and desirable for various reasons.
Der Erfindung liegt daher die Aufgabe zu Grunde, ein Verfahren zu entwickeln, das eine besonders wirtschaftliche Herstellung von Hüttensand ermöglicht und das damit eine erste wichtige Voraussetzung für eine Vergrößerung des Hüttensandanteiles im Zement schafft.The invention is therefore based on the object to develop a method that enables a particularly economical production of granulated blastfurnace slag and thus creates a first important prerequisite for increasing the content of blastfurnace slag in cement.
Diese Aufgabe wird erfindungsgemäß durch die Merkmale des Anspruches 1 gelöst.This object is achieved by the features of
Ebenso wie der bekannte Hochofenprozess zur Roheisenherstellung nutzt auch das neue Verfahren eine metallische Schmelze, über der sich schwimmende Schlacke bildet. Im Unterschied zu dem bekannten Hochofenprozess wird jedoch erfindungsgemäß einerseits der Schmelze in erster Linie nicht Eisenerz, sondern schlackenbildendes Rohmaterial zugeführt, und es wird andererseits als Hauptprodukt des Schmelzprozesses nicht Roheisen, sondern die Schmelze abgezogen, während die metallische Schmelze weitgehend erhalten bleibt.Like the well-known blast furnace process for pig iron production, the new process also uses a metallic melt over which floating slag forms. In contrast to the known blast furnace process, according to the invention, on the one hand, the melt is supplied primarily not iron ore but slag-forming raw material, and on the other hand, as the main product of the melting process, not pig iron, but the melt is withdrawn, while the metallic melt is largely retained.
Auf diese Weise lässt sich Hüttensand in großtechnischem Maßstab sehr wirtschaftlich herstellen.In this way, granulated blastfurnace can be produced very economically on an industrial scale.
Bei dem erfindungsgemäßen Verfahren wird das schlackenbildende Rohmaterial zweckmäßig in feinkörniger Form zunächst vorgewärmt, unter Zugabe von Brennstoff vorcalciniert und dann unmittelbar in die metallische Schmelze eingetragen.In the method according to the invention, the slag-forming raw material is expediently preheated initially in fine-grained form, precalcined with the addition of fuel and then introduced directly into the metallic melt.
Die zur Aufrechterhaltung der Schmelze und des reduzierenden Betriebes des Schmelzprozesses erforderliche Energiezufuhr kann durch Zugabe von Brennstoff und Verbrennungsluft in die Schmelze erfolgen.The energy required to maintain the melt and the reducing operation of the melting process can be made by adding fuel and combustion air into the melt.
Die aus der Schmelze abgezogene Schlacke wird so rasch abgekühlt, dass zumindest der überwiegende Teil der Schlacke glasig erstarrt. Dann wird zumindest ein Teil der abgekühlten Schlacke bis auf mindestens 8.000 Blaine, vorzugsweise mindestens 10.000 Blaine, fein gemahlen.The slag removed from the melt is cooled down so rapidly that at least the major part of the slag solidifies glassy. Then at least a portion of the cooled slag is finely ground to at least 8,000 Blaine, preferably at least 10,000 Blaine.
Wird ein nach dem erfindungsgemäßen Verfahren in sehr wirtschaftlicher Weise hergestellter und besonders fein gemahlener Hüttensand als Bestandteil von Zement verwendet, so kann der Anteil von Hüttensand gegenüber dem Klinkeranteil im Vergleich zum Stand der Technik wesentlich vergrößert werden, ohne dass dadurch die Eigenschaften des Zements beeinträchtigt, insbesondere seine Frühfestigkeit herabgesetzt werden. Eine Vergrößerung des Hüttensandanteiles im Zement bringt den großen Vorteil mit sich, dass dadurch eine Zementherstellung mit wesentlich verringerter CO2-Emission ermöglicht wird. Dies erklärt sich insbesondere damit, dass das Rohmaterial des erfindungsgemäßen Verfahrens zur Herstellung von Hüttensand einen geringeren Anteil an Karbonaten aufweist als das für die Herstellung von Klinker verwendete Rohmaterial.If a granulated blastfurnace slag manufactured in a very economical manner and very finely ground by the process according to the invention is used as a constituent of cement, the fraction of granulated slag relative to the clinker fraction can be substantially increased in comparison to the prior art without impairing the properties of the cement. in particular its early strength can be reduced. Increasing the amount of blastfurnace slag in cement has the great advantage of enabling cement production with significantly reduced CO 2 emissions. This is explained, in particular, by the fact that the raw material of the method according to the invention for producing granulated slag has a lower proportion of carbonates than the raw material used for the production of clinker.
Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung schematisch dargestellt.An embodiment of the invention is shown schematically in the drawing.
Die Anlage zur Herstellung von Zement enthält einen Vorwärmer
Das schlackenbildende Rohmaterial wird dem Vorwärmer
Die Abgase (Pfeil
Dem Schmelzreaktor
Die sich im Schmelzreaktor bildende schwimmende Schlacke
Die aus dem Schmelzreaktor abgezogene flüssige Schlacke (Pfeil
Der so hergestellte, überwiegend amorphe Hüttensand (Pfeil
Claims (12)
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102008038692A DE102008038692B4 (en) | 2008-08-12 | 2008-08-12 | Process and plant for the production of granulated blastfurnace slag and process for the production of cement |
CN200980131673.8A CN102119229B (en) | 2008-08-12 | 2009-07-31 | The method and apparatus for manufacturing granulated blast furnace slag |
EP09781347.1A EP2324134B1 (en) | 2008-08-12 | 2009-07-31 | Method for producing granulated metallurgical sand |
PCT/EP2009/059939 WO2010018080A1 (en) | 2008-08-12 | 2009-07-31 | Method and installation for producing granulated blast-furnace slag |
Applications Claiming Priority (1)
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DE102008038692A DE102008038692B4 (en) | 2008-08-12 | 2008-08-12 | Process and plant for the production of granulated blastfurnace slag and process for the production of cement |
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Publication Number | Publication Date |
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DE102008038692A1 DE102008038692A1 (en) | 2010-03-04 |
DE102008038692B4 true DE102008038692B4 (en) | 2013-05-02 |
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DE102008038692A Expired - Fee Related DE102008038692B4 (en) | 2008-08-12 | 2008-08-12 | Process and plant for the production of granulated blastfurnace slag and process for the production of cement |
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Publication number | Priority date | Publication date | Assignee | Title |
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DE102017119675B4 (en) | 2017-08-28 | 2019-07-04 | Voestalpine Stahl Gmbh | Process for the treatment of slag |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE441365C (en) * | 1924-01-22 | 1927-02-28 | Ver Stahlwerke Akt Ges | Process for producing pig iron and a slag that can be used directly as cement in a blast furnace |
EP1001038A1 (en) * | 1998-11-11 | 2000-05-17 | "HOLDERBANK" Financière Glarus AG | Process for granulating liquid slag |
DE10340880A1 (en) * | 2003-09-04 | 2005-03-31 | Polysius Ag | Process for pulverizing slag from a blast furnace used during pig iron manufacture comprises adding an additional material to the slag after removing pig iron and before pulverizing |
-
2008
- 2008-08-12 DE DE102008038692A patent/DE102008038692B4/en not_active Expired - Fee Related
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE441365C (en) * | 1924-01-22 | 1927-02-28 | Ver Stahlwerke Akt Ges | Process for producing pig iron and a slag that can be used directly as cement in a blast furnace |
EP1001038A1 (en) * | 1998-11-11 | 2000-05-17 | "HOLDERBANK" Financière Glarus AG | Process for granulating liquid slag |
DE10340880A1 (en) * | 2003-09-04 | 2005-03-31 | Polysius Ag | Process for pulverizing slag from a blast furnace used during pig iron manufacture comprises adding an additional material to the slag after removing pig iron and before pulverizing |
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