WO2014037020A1 - Verfahren zur aufbereitung von stahlwerkschlacken sowie hydraulisches mineralisches bindemittel - Google Patents
Verfahren zur aufbereitung von stahlwerkschlacken sowie hydraulisches mineralisches bindemittel Download PDFInfo
- Publication number
- WO2014037020A1 WO2014037020A1 PCT/EP2012/003744 EP2012003744W WO2014037020A1 WO 2014037020 A1 WO2014037020 A1 WO 2014037020A1 EP 2012003744 W EP2012003744 W EP 2012003744W WO 2014037020 A1 WO2014037020 A1 WO 2014037020A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- melt
- iron
- slag
- reducing agent
- binder
- Prior art date
Links
- 239000002893 slag Substances 0.000 title claims abstract description 54
- 239000011230 binding agent Substances 0.000 title claims abstract description 49
- 238000000034 method Methods 0.000 title claims abstract description 49
- 229910052500 inorganic mineral Inorganic materials 0.000 title claims abstract description 35
- 239000011707 mineral Substances 0.000 title claims abstract description 35
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 66
- 239000000155 melt Substances 0.000 claims abstract description 46
- 229910052742 iron Inorganic materials 0.000 claims abstract description 28
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims abstract description 19
- 235000011941 Tilia x europaea Nutrition 0.000 claims abstract description 19
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 19
- 239000004571 lime Substances 0.000 claims abstract description 19
- 230000008569 process Effects 0.000 claims description 19
- 238000001816 cooling Methods 0.000 claims description 15
- 239000000203 mixture Substances 0.000 claims description 10
- 230000009467 reduction Effects 0.000 claims description 9
- 230000001590 oxidative effect Effects 0.000 claims description 8
- 150000002506 iron compounds Chemical class 0.000 claims description 7
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 6
- 229910052799 carbon Inorganic materials 0.000 claims description 6
- 239000007788 liquid Substances 0.000 claims description 6
- 229910052751 metal Inorganic materials 0.000 claims description 4
- 239000002184 metal Substances 0.000 claims description 4
- 229910052782 aluminium Inorganic materials 0.000 claims description 3
- 229910021538 borax Inorganic materials 0.000 claims description 3
- 238000000227 grinding Methods 0.000 claims description 3
- 238000012545 processing Methods 0.000 claims description 3
- 238000000926 separation method Methods 0.000 claims description 3
- 229910052710 silicon Inorganic materials 0.000 claims description 3
- 239000010703 silicon Substances 0.000 claims description 3
- 239000004328 sodium tetraborate Substances 0.000 claims description 3
- 235000010339 sodium tetraborate Nutrition 0.000 claims description 3
- 238000007711 solidification Methods 0.000 claims description 3
- 230000008023 solidification Effects 0.000 claims description 3
- 230000000007 visual effect Effects 0.000 claims description 3
- 239000011261 inert gas Substances 0.000 claims description 2
- 150000002739 metals Chemical class 0.000 claims description 2
- 238000004064 recycling Methods 0.000 abstract 1
- 239000012071 phase Substances 0.000 description 21
- BCAARMUWIRURQS-UHFFFAOYSA-N dicalcium;oxocalcium;silicate Chemical compound [Ca+2].[Ca+2].[Ca]=O.[O-][Si]([O-])([O-])[O-] BCAARMUWIRURQS-UHFFFAOYSA-N 0.000 description 20
- 239000000047 product Substances 0.000 description 19
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 16
- 239000004568 cement Substances 0.000 description 11
- 239000011572 manganese Substances 0.000 description 11
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 10
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 9
- 239000000292 calcium oxide Substances 0.000 description 9
- 238000006722 reduction reaction Methods 0.000 description 8
- 238000004519 manufacturing process Methods 0.000 description 6
- 230000009257 reactivity Effects 0.000 description 6
- 229910052786 argon Inorganic materials 0.000 description 5
- 230000015572 biosynthetic process Effects 0.000 description 5
- 239000007789 gas Substances 0.000 description 5
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 4
- 238000003723 Smelting Methods 0.000 description 4
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 4
- 239000011575 calcium Substances 0.000 description 4
- 239000013078 crystal Substances 0.000 description 4
- 238000005187 foaming Methods 0.000 description 4
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N iron oxide Inorganic materials [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 4
- 238000002844 melting Methods 0.000 description 4
- 230000008018 melting Effects 0.000 description 4
- 239000006004 Quartz sand Substances 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 3
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 description 3
- JHLNERQLKQQLRZ-UHFFFAOYSA-N calcium silicate Chemical compound [Ca+2].[Ca+2].[O-][Si]([O-])([O-])[O-] JHLNERQLKQQLRZ-UHFFFAOYSA-N 0.000 description 3
- 235000012241 calcium silicate Nutrition 0.000 description 3
- 229910052918 calcium silicate Inorganic materials 0.000 description 3
- 238000010891 electric arc Methods 0.000 description 3
- 238000010348 incorporation Methods 0.000 description 3
- 239000011159 matrix material Substances 0.000 description 3
- 238000007254 oxidation reaction Methods 0.000 description 3
- 230000001681 protective effect Effects 0.000 description 3
- 239000000377 silicon dioxide Substances 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 2
- 229910004298 SiO 2 Inorganic materials 0.000 description 2
- 229910052791 calcium Inorganic materials 0.000 description 2
- 239000001569 carbon dioxide Substances 0.000 description 2
- 229910002092 carbon dioxide Inorganic materials 0.000 description 2
- 229910002091 carbon monoxide Inorganic materials 0.000 description 2
- 238000005266 casting Methods 0.000 description 2
- 238000012937 correction Methods 0.000 description 2
- AMWRITDGCCNYAT-UHFFFAOYSA-L hydroxy(oxo)manganese;manganese Chemical compound [Mn].O[Mn]=O.O[Mn]=O AMWRITDGCCNYAT-UHFFFAOYSA-L 0.000 description 2
- 238000011835 investigation Methods 0.000 description 2
- 150000002500 ions Chemical class 0.000 description 2
- 235000013980 iron oxide Nutrition 0.000 description 2
- VBMVTYDPPZVILR-UHFFFAOYSA-N iron(2+);oxygen(2-) Chemical class [O-2].[Fe+2] VBMVTYDPPZVILR-UHFFFAOYSA-N 0.000 description 2
- 238000003801 milling Methods 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 238000011946 reduction process Methods 0.000 description 2
- 238000010583 slow cooling Methods 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 1
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 description 1
- MBMLMWLHJBBADN-UHFFFAOYSA-N Ferrous sulfide Chemical class [Fe]=S MBMLMWLHJBBADN-UHFFFAOYSA-N 0.000 description 1
- KRHYYFGTRYWZRS-UHFFFAOYSA-M Fluoride anion Chemical compound [F-] KRHYYFGTRYWZRS-UHFFFAOYSA-M 0.000 description 1
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- 239000011398 Portland cement Substances 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 239000012072 active phase Substances 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910000323 aluminium silicate Inorganic materials 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 239000001110 calcium chloride Substances 0.000 description 1
- 229910001628 calcium chloride Inorganic materials 0.000 description 1
- 229910001634 calcium fluoride Inorganic materials 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000009770 conventional sintering Methods 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 150000004820 halides Chemical class 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- -1 iron halides Chemical class 0.000 description 1
- WALCGGIJOOWJIN-UHFFFAOYSA-N iron(ii) selenide Chemical class [Se]=[Fe] WALCGGIJOOWJIN-UHFFFAOYSA-N 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 description 1
- 238000001465 metallisation Methods 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000004570 mortar (masonry) Substances 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000002006 petroleum coke Substances 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 239000011819 refractory material Substances 0.000 description 1
- 238000010405 reoxidation reaction Methods 0.000 description 1
- 238000007086 side reaction Methods 0.000 description 1
- 235000012239 silicon dioxide Nutrition 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
- C21C5/36—Processes yielding slags of special composition
-
- 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
- C04B5/06—Ingredients, other than water, added to the molten slag or to the granulating medium or before remelting; Treatment with gases or gas generating compounds, e.g. to obtain porous 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
- 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
- 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
- C22B7/04—Working-up slag
-
- 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
-
- 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
-
- 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
Definitions
- the invention relates to a method for the treatment of steelworks slags for producing a hydraulic mineral binder with high hardening potential and for recovering iron according to claim 1 and a hydraulic mineral binder according to claim 14.
- Steelworks slags which are also referred to as LD slags, LSD or SWS, process-related still contain very large amounts of iron, which is partly present in metallic form, but mainly in the form of oxides mineral bound in the slag.
- These iron oxides present in the slag can not be recovered in a purely mechanical way, since they are firmly bound in the slag matrix and must first be converted by a thermochemical reduction into the elemental metallic form.
- the slag matrix consists mainly of the typical oxides of calcium oxide, silica and alumina. In contrast to other slag forms, such as blast furnace slag, they do not occur in hydraulically active phases and are therefore not suitable for high-quality utilization in cement. Therefore, they are used almost exclusively as piece slag, that is grit, in road and road construction.
- EP 1 370 501 B1 discloses a process for treating steel slag in order to impart the properties of a hydraulic binder to the slag.
- the resulting product is said to be at least equivalent to Portland cement clinker.
- the steel slag which contains based on the total weight of the slag at least 45 M .-% calcium oxide and less than 30 M .-% Fe2Ü3, by oxidation with oxygen or air under a pressure of 1 to 15 bar at a temperature of 1650 ° C treated to 1,400 ° C.
- a lime source which is optionally supplemented with a silicon dioxide source or an alumina source.
- the proportions of the lime source and optionally the source of silica or alumina are chosen so that after conversion and at ambient temperature, the slag has a Fe 2 O 3 content of at least 13 mass% and a mineralogical composition comprising at least 40 M. % of the mineralogical phase contains C 3 S and more than 10 M .-% calcium chloride / fluoride in the form of the mineralogical phases C2F or C 4 AF.
- a disadvantage of this method is that the iron present in the slag is not recovered.
- a hydraulic binder is to be prepared which at least 25 M .-% calcium and magnesium aluminosilicates, at least 5 M .-% mineral oxides and / or halides and a maximum of 31 M .-% alumina, a maximum of 10 M .-% Calciumalumoferrit and maximum 0.01 M .-% carbon.
- starting materials including steelworks slags, are to be melted in appropriate amounts in a reducing atmosphere.
- the resulting product should be isolated. This can be done both by means of a rapid cooling, for example with water or air, as well as by means of a slow cooling.
- the invention is therefore based on the object of specifying a process for the treatment of steelworks slags, in which both a hydraulic mineral binder having a high hardening potential can be produced and iron can be recovered. Furthermore, the invention has for its object to provide a hydraulic mineral binder with high hardening potential. This object is achieved by a method for the treatment of steelworks slag with the features of claim 1 and by a hydraulic mineral binder having the features of claim 14.
- a feed product comprising steel mill slag with iron compounds, especially in oxidic form, and MnO, wherein the MnO may be contained in the steelworks slag.
- This feedstock is further processed as a melt by introducing reducing agents into the melt to reduce the iron compounds to achieve a lime standard of between 90 and 110 in the molten mineral fraction, with introduction of the reducing agent in a non-oxidizing atmosphere.
- the melt is then cooled in a defined manner, with the melt solidifying in at least 15 minutes.
- elemental iron is mechanically separated from the solidified melt.
- the solidified melt which has a reduced iron content, fed to a use as a hydraulic mineral binder.
- the delivery product means the steelworks slag and, if necessary, further correction components such as MnO.
- MnO further correction components
- the iron compounds in the steelworks slag as iron halides, iron sulfides, iron selenides and in particular iron oxides, such as FeO, Fe 2 O 3 or Fe 3 O, before.
- the feed product may either be melt-heated in suitable containers or externally provided in a molten state.
- suitable containers or externally provided in a molten state.
- an electric arc furnace in particular in a three-phase closed form, can be used to melt the feed product or to further heat the melt.
- the iron compounds are converted into the elemental metallic form.
- This will result in the mineral melt Part a lime standard in a range between 90 and 1 10, preferably between 95 and 105, achieved.
- the term "mineral melt fraction" can be understood to mean the melt minus the elemental iron.
- the lime standard (KSt) indicates the actually present in the raw material or clinker CaO content in percentages of that CaO content, which can be bonded under technical firing and cooling conditions in the maximum case of SiO 2 , Al 2 0 3 and Fe20 3 . He is about the equation
- the elemental iron can be mechanically separated and fed to a further utilization. A large part of the iron settles due to the greater density compared to the remaining slag in the lower part of the melting vessel. Another part remains in the form of droplets and inclusions in the cooled slag.
- the slag with the reduced iron content can be used as a hydraulic mineral binder.
- This binder is hereinafter referred to as LDS binder.
- This LDS binder is characterized by a very high reactivity and hardenability. It has an alite content (C 3 S) of at least 40% by mass.
- the invention is essentially based on three basic ideas interacting with one another: first, the provision of MnO in the melt, second, reduction of the iron until, in the mineral melt fraction, the specified lime standard is achieved, and third, the slow, defined cooling.
- the defined cooling process causes the formation of very large Alitkristallen. These can be up to a millimeter in size. Also, no regression processes to belite (C 2 S) and free lime (CaO) can be seen at the edges of the crystals in investigations. Under conventional clinker production conditions, slow cooling processes lead to a decomposition of the alite into belite and free lime. Against this background, a complex clinker cooling is necessary within the production of cement.
- the particularly high reactivity of the resulting alite phase is attributed to the presence of Mn 2+ ions, which are incorporated into the lattice structure of the alite phase and disturb it, so that the hardening potential of the LDS binder, which in particular attributable to the alite phase is significantly increased.
- the Mn is present in its 2-valent form as Mn 2+ . This allows incorporation into the lattice of the Alite, replacing Ca in the lattice. Installation rates of up to 3% are achieved.
- Mn compounds are present in the cement raw material, Mn will be present as Mn 3+ by the oxidative process of cement clinker production. As a result, the Mn 3+ tends to be incorporated into the lattice sites of the Fe in the C4AF. An incorporation of Mn 3+ on the Ca lattice sites of the Alite or Belits is not possible.
- the required lime standard also plays a decisive role for the high alite content and the high reactivity of the LDS binder according to the invention.
- any desired amount of MnO can be present in the feed product.
- the feed product comprises 0.1% by weight to 10% by weight, in particular 0.5% by weight to 5% by weight, of MnO. This content of manganese oxide ensures that a significant amount of Mn 2+ ions are incorporated into the crystal lattice of the alite phase, thereby disturbing the crystal structure.
- the feed product contains up to 5% by weight of Al 2 O 3 and / or 30 to 50% by weight of CaO and / or 10 to 20% by weight of SiO 2 .
- the object product contains 3 to 5 wt .-% Al 2 0 3 and / or 35 to 45 wt .-% CaO and / or 15 to 20 wt .-% Si0. 2
- the formation of the alite phase is favored from a thermochemical point of view. Furthermore, in these concentration ranges of the oxides involved, a lime standard between 90 and 110, or even more preferably between 95 and 105, is achieved with high probability. If the said composition is not already present in the delivered steelworks slagstock, then the inferior oxides may optionally be added before or during the smelting process.
- the melt before and / or during the reduction, has a temperature of about 1,600 ° C to about 1,800 ° C, in particular of 1,650 ° C to 1,750 ° C.
- the feed product in particular the oxidic components, are completely melted and the reduction reaction has a sufficiently high rate to even under energetic and thermochemical aspects to ensure a rapid flow of the reduction process.
- the non-oxidizing atmosphere may be a reducing atmosphere.
- the reduction process which mainly takes place by the reductant supplied in solid form, is further supported.
- carbon, silicon and / or other metals or semimetals are used as the reducing agent.
- Petroleum coke is particularly suitable as a carbon modification, since it has a very high specific surface area and correspondingly high reactivity.
- Silicon, calcium and aluminum also have the advantage that the oxides can form components of the slag.
- At least part of the reducing agent can be injected into the melt, for example by means of a protective gas stream.
- a protective gas stream In particular, hollow electrodes are suitable for injecting the reducing agent into the melt when using an arc furnace.
- a protective gas avoids unwanted side reactions, in particular oxidations of the reducing agent and the oxide components contained in the melt taking place.
- Argon for example, is suitable as protective gas. If necessary, another part of the reducing agent can be mixed with the feed slag in advance in a certain ratio.
- carbon monoxide and carbon dioxide can be produced as a by-product in the reduction of the oxides. These gases escape from the melt, which can lead to foaming. In order to reduce the foaming, it may be advantageous to introduce borax into the melt.
- liquid elemental iron is separated off. Since liquid elemental iron has a higher density than the melt phase, it accumulates at the bottom of the furnace and can be relatively easily withdrawn from there.
- a container for receiving the melt phase which makes it possible to keep by additional energy input, the melt in the liquid state, for example, an arc furnace.
- the melt can be cooled as slowly as desired. However, it is preferred if the melt is solidified after a maximum of four hours, in particular two hours. During this period, thermodynamically stable mineralogical phases, in particular of alite, can form
- the defined cooling can take place in cooling containers. This can be done, for example, molds or other containers, with which one can influence the cooling process in time.
- the Abkühl variousnisse can be fed by special casting machines, which in turn are filled from the smelting unit.
- the mechanical separation of the elemental iron takes place by means of a milling process and a visual process.
- a method is particularly suitable, as disclosed in international patent application WO 201 1/107124 A1.
- the iron is exposed during the milling process, subsequently separated on a grinding table by the density differences between the iron and the mineralogical matrix, then discharged over the edge of the plate and optionally further enriched by subsequent sorting and visual processes.
- a roller mill preferably of the LOESCHE type, is used.
- the invention relates to a hydraulic mineral binder, which has a mineral composition of at least 40 M .-% alite (C 3 S) and a lime standard of about 90 to 110. Preference is given to a higher alite content of 50% by mass, in particular 60% by mass.
- the hydraulic mineral binder can be produced by means of the method according to the invention and is also referred to as LDS binder in the context of the invention.
- the LDS binder has a mineralogical composition of not more than 30% by weight of glass phases. They do not contribute to the setting ability of the binder, but can bind free lime, ie calcium oxide, and thereby increase the lime standard.
- the invention will be explained in more detail with reference to a schematic exemplary embodiment with reference to the figures. This shows
- Fig. 1 is a schematic flow diagram of an embodiment of the method according to the invention.
- Fig. 2 is a graph of strength studies of the hydraulic mineral binder of the invention.
- a feed product is provided in step I.
- This essentially comprises LD slag.
- the feed product has an MnO content in the range between 1% by mass to 5% by mass.
- Many LD slags which are also referred to as SWS, already have an MnO content in the desired range. Otherwise, the MnO is added to the slag.
- reducing agent can be added to the feed product. For this z. B. Petrokoks on.
- the processing of the feed product to the melt takes place.
- the slag can either be obtained in the molten state from an upstream process or be present in cooled solid form. Melting and / or heating of the slag can take place in an electric arc furnace. It can be operated in resistance mode with a refractory lining made of graphite or carbonaceous refractory material.
- the electric arc furnace can also be referred to as a melting unit.
- the melt should reach a temperature of between about .650 ° C to about .150 ° C, before starting to add reducing centers in step III.
- the reduction of the iron compounds in the melt can result in carbon monoxide and / or carbon dioxide, which escapes as gases from the melt. This can lead to a foaming of the melt.
- a small amount of borax may be added to the melt. As a result, the viscosity of the melt is reduced.
- the furnace atmosphere is enriched with an inert gas, for example with argon.
- the argon can too be introduced directly into the melt.
- a part of the reducing agent can also be injected directly into the melt with the argon stream.
- the flowing through the melt argon causes a turbulence of the molten bath, which has a positive effect on the metal deposition.
- the residual mineral melt fraction should have a lime standard between 90 and 110. This must be taken into account when compiling the application product.
- the desired lime standard can be achieved with many LD slags.
- step IV the liquid melt, for example via a casting apparatus, in special cooling devices, such as dies, transferred and slowly cooled there in a period of at least fifteen minutes to about two hours.
- special cooling devices such as dies
- another part of the metal phase remains after cooling in the form of droplets and inclusions in the mineral content, so that their mechanical treatment is necessary to increase the metal yield.
- the remaining mineral content is the LDS binder according to the invention, which is present in stage VI. It can be used as a high quality hydraulic mineral binder.
- Table 1 shows the chemical composition of a feed product, which is an untreated LD slag, and the LDS binder obtained by means of the method according to the invention. Here, the values are given in% by weight.
- Starting slag LDS binder
- Table 1 Chemical analysis of the starting slag and the LDS binder in M .-%
- Table 1 shows a lime standard of 70.1 for the starting slag and 104.3 for the LDS binder.
- Table 2 the crystalline composition of the starting slag and the LDS binder in M .-% is reproduced.
- Table 2 Phase composition of the starting slag and the LDS binder according to Rietveld in
- the first sample used was CEM I 42.5 R reference cement.
- the second sample had a composition of 70% reference cement and 30% quartz sand, fraction 0-2 mm, using the quartz sand as unreactive inert aggregate.
- the third sample consisted of 70% reference cement and 30% LDS binder.
- the LDS binder was ground to a specific surface area of 4000 cm 2 / g Blaine.
- sample 3 with the LDS binder is above the strength level of comparative sample 2 with quartz sand. From this it can be concluded that already after 2 days the LDS binder provides an independent strength contribution. After 7 days, sample 3 with LDS binder almost reached the strength level of the reference cement, and even exceeded it after 28 days.
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Ceramic Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Metallurgy (AREA)
- Structural Engineering (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Mechanical Engineering (AREA)
- Manufacture And Refinement Of Metals (AREA)
- Processing Of Solid Wastes (AREA)
- Inorganic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
- Treatment Of Steel In Its Molten State (AREA)
- Furnace Details (AREA)
- Carbon Steel Or Casting Steel Manufacturing (AREA)
Abstract
Description
Claims
Priority Applications (16)
Application Number | Priority Date | Filing Date | Title |
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UAA201500779A UA110757C2 (uk) | 2012-09-06 | 2012-06-09 | Спосіб обробки сталевого шлаку та гідравлічний мінеральний в'яжучий матеріал |
IN816DEN2015 IN2015DN00816A (de) | 2012-09-06 | 2012-09-06 | |
DE112012006645.6T DE112012006645B4 (de) | 2012-09-06 | 2012-09-06 | Verfahren zur Aufbereitung von Stahlwerkschlacken |
KR1020157002864A KR101949165B1 (ko) | 2012-09-06 | 2012-09-06 | 스틸 슬래그 처리 방법 및 수경성 광물 바인더 |
ES12768710T ES2822162T3 (es) | 2012-09-06 | 2012-09-06 | Procedimiento de tratamiento de escorias de acerías |
EP12768710.1A EP2892860B1 (de) | 2012-09-06 | 2012-09-06 | Verfahren zur aufbereitung von stahlwerkschlacken |
CN201280075088.2A CN104540791B (zh) | 2012-09-06 | 2012-09-06 | 用于处理钢渣的方法和水硬性矿物粘合剂 |
BR112015002324-0A BR112015002324B1 (pt) | 2012-09-06 | 2012-09-06 | método para processar escória de aço para produzir um ligante de mineral hidráulico e para recuperar ferro |
CA2880664A CA2880664C (en) | 2012-09-06 | 2012-09-06 | Method for processing steel slag and hydraulic mineral binder |
US14/419,167 US9695485B2 (en) | 2012-09-06 | 2012-09-06 | Method for the treatment of steelwork slag and hydraulic mineral binder |
PCT/EP2012/003744 WO2014037020A1 (de) | 2012-09-06 | 2012-09-06 | Verfahren zur aufbereitung von stahlwerkschlacken sowie hydraulisches mineralisches bindemittel |
JP2015530301A JP6138257B2 (ja) | 2012-09-06 | 2012-09-06 | 製鋼スラグを加工するための方法 |
EA201500215A EA026896B1 (ru) | 2012-09-06 | 2012-09-06 | Способ переработки сталеплавильных шлаков, а также гидравлическое минеральное вяжущее средство |
TW102130149A TWI518052B (zh) | 2012-09-06 | 2013-08-23 | 用於處理鋼熔渣及水凝礦物結合劑的方法 |
SA113340827A SA113340827B1 (ar) | 2012-09-06 | 2013-09-04 | طريقة لمعالجة خبث الفولاذ ورابط معدني هيدروليكي |
ARP130103144A AR092438A1 (es) | 2012-09-06 | 2013-09-04 | Procedimiento para el acondicionamiento de escorias de aceria y tambien ligante mineral hidraulico |
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PCT/EP2012/003744 WO2014037020A1 (de) | 2012-09-06 | 2012-09-06 | Verfahren zur aufbereitung von stahlwerkschlacken sowie hydraulisches mineralisches bindemittel |
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US (1) | US9695485B2 (de) |
EP (1) | EP2892860B1 (de) |
JP (1) | JP6138257B2 (de) |
KR (1) | KR101949165B1 (de) |
CN (1) | CN104540791B (de) |
AR (1) | AR092438A1 (de) |
BR (1) | BR112015002324B1 (de) |
CA (1) | CA2880664C (de) |
DE (1) | DE112012006645B4 (de) |
EA (1) | EA026896B1 (de) |
ES (1) | ES2822162T3 (de) |
IN (1) | IN2015DN00816A (de) |
SA (1) | SA113340827B1 (de) |
TW (1) | TWI518052B (de) |
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WO (1) | WO2014037020A1 (de) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
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WO2017008863A1 (de) * | 2015-07-16 | 2017-01-19 | Loesche Gmbh | Verfahren und anlagenanordnung zum aufbereiten und aktivieren eines rohstoffes |
EP3315471A1 (de) * | 2016-10-31 | 2018-05-02 | Loesche GmbH | Verfahren zum aufbereiten und aktivieren von stahlwerkschlacken |
Families Citing this family (1)
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ES2596526T3 (es) * | 2013-09-02 | 2017-01-10 | Loesche Gmbh | Procedimiento para tratar escoria de acería así como un aglutinante mineral hidráulico |
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- 2012-09-06 DE DE112012006645.6T patent/DE112012006645B4/de not_active Expired - Fee Related
- 2012-09-06 IN IN816DEN2015 patent/IN2015DN00816A/en unknown
- 2012-09-06 EA EA201500215A patent/EA026896B1/ru not_active IP Right Cessation
- 2012-09-06 CN CN201280075088.2A patent/CN104540791B/zh active Active
- 2012-09-06 KR KR1020157002864A patent/KR101949165B1/ko active IP Right Grant
- 2012-09-06 CA CA2880664A patent/CA2880664C/en active Active
- 2012-09-06 EP EP12768710.1A patent/EP2892860B1/de active Active
- 2012-09-06 WO PCT/EP2012/003744 patent/WO2014037020A1/de active Application Filing
- 2012-09-06 ES ES12768710T patent/ES2822162T3/es active Active
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Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
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WO2017008863A1 (de) * | 2015-07-16 | 2017-01-19 | Loesche Gmbh | Verfahren und anlagenanordnung zum aufbereiten und aktivieren eines rohstoffes |
EP3322534B1 (de) | 2015-07-16 | 2020-09-02 | Loesche GmbH | Verfahren und anlagenanordnung zum aufbereiten und aktivieren eines rohstoffes |
EP3315471A1 (de) * | 2016-10-31 | 2018-05-02 | Loesche GmbH | Verfahren zum aufbereiten und aktivieren von stahlwerkschlacken |
WO2018077590A1 (de) * | 2016-10-31 | 2018-05-03 | Loesche Gmbh | Verfahren zum aufbereiten und aktivieren von stahlwerkschlacken |
KR20190078596A (ko) * | 2016-10-31 | 2019-07-04 | 로쉐 게엠베하 | 제강 슬래그의 처리 및 활성화 방법 |
KR102425677B1 (ko) | 2016-10-31 | 2022-07-26 | 로쉐 게엠베하 | 제강 슬래그의 처리 및 활성화 방법 |
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KR101949165B1 (ko) | 2019-02-18 |
CA2880664C (en) | 2020-01-07 |
AR092438A1 (es) | 2015-04-22 |
DE112012006645A5 (de) | 2015-04-16 |
EP2892860B1 (de) | 2020-08-19 |
EP2892860A1 (de) | 2015-07-15 |
JP6138257B2 (ja) | 2017-05-31 |
TW201412683A (zh) | 2014-04-01 |
SA113340827B1 (ar) | 2015-10-22 |
JP2015534530A (ja) | 2015-12-03 |
TWI518052B (zh) | 2016-01-21 |
KR20150053896A (ko) | 2015-05-19 |
US9695485B2 (en) | 2017-07-04 |
EA026896B1 (ru) | 2017-05-31 |
IN2015DN00816A (de) | 2015-06-12 |
CA2880664A1 (en) | 2014-03-13 |
CN104540791A (zh) | 2015-04-22 |
BR112015002324B1 (pt) | 2020-10-20 |
EA201500215A1 (ru) | 2015-06-30 |
CN104540791B (zh) | 2016-08-17 |
US20150159233A1 (en) | 2015-06-11 |
UA110757C2 (uk) | 2016-02-10 |
ES2822162T3 (es) | 2021-04-29 |
DE112012006645B4 (de) | 2016-07-14 |
BR112015002324A2 (pt) | 2017-07-04 |
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