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EP4584231A1 - Procédé d'activation de scories d'acier de four à oxygène basique - Google Patents

Procédé d'activation de scories d'acier de four à oxygène basique

Info

Publication number
EP4584231A1
EP4584231A1 EP23768185.3A EP23768185A EP4584231A1 EP 4584231 A1 EP4584231 A1 EP 4584231A1 EP 23768185 A EP23768185 A EP 23768185A EP 4584231 A1 EP4584231 A1 EP 4584231A1
Authority
EP
European Patent Office
Prior art keywords
phosphate
steel slag
bof
minerals
basic oxygen
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.)
Pending
Application number
EP23768185.3A
Other languages
German (de)
English (en)
Inventor
Yanjie TANG
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.)
Tata Steel Ijmuiden BV
Original Assignee
Tata Steel Ijmuiden BV
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 NL2032992A external-priority patent/NL2032992B1/en
Application filed by Tata Steel Ijmuiden BV filed Critical Tata Steel Ijmuiden BV
Publication of EP4584231A1 publication Critical patent/EP4584231A1/fr
Pending legal-status Critical Current

Links

Classifications

    • 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
    • C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
    • C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
    • C04B28/08—Slag cements
    • C04B28/082—Steelmaking slags; Converter slags

Definitions

  • Blast furnace slag is distinct from BOF steel slag. Where blast furnace slag results from smelting iron ore, coke, and fluxes during the operations of extracting iron from the iron ore, the BOF steel slag is formed during refining operations converting the crude iron into steel by combining fluxes with the nonferrous oxides and other unwanted elements in the raw materials under molten state.
  • Blast furnace slag is composed of: CaO 34-42 wt.%, SiO 2 28-38 wt.%, AI 2 O 3 8-20 wt.%, MgO 6-12 wt.%, and a very low total Fe-content expressed as FeO (FeO, Fe 2 O 3 ) of less than 2 wt.%.
  • Patent document US-5,553,670 discloses a method and composition for cementing a well by combining water, blast furnace slag and a phosphate-ion containing compounds to form a cement slurry, displacing the cement slurry into the well, and allowing the cement slurry to set.
  • the use of sodium hexametaphosphate, sodium tripolyphosphate, and tetrasodium polyphosphate are disclosed as activator to reduce the setting time of the cement slurry.
  • NEWCEM blast furnace slag is used in combination with 50% distilled water by weight of slag.
  • the present invention proposes, in a first aspect, a method for activating Basic Oxygen Furnace (BOF) steel slag minerals for use in building products, the method comprising a step of adding an activator to the Basic Oxygen Furnace (BOF) steel slag minerals, wherein the activator is a phosphate compound selected from the group consisting of: monopotassium phosphate, monosodium phosphate, monoammonium phosphate, dipotassium phosphate, disodium phosphate, di-ammonium phosphate, tripotassium phosphate, trisodium phosphate, tri-ammonium phosphate, or a combination thereof.
  • the activator is a phosphate compound selected from the group consisting of: monopotassium phosphate, monosodium phosphate, monoammonium phosphate, dipotassium phosphate, disodium phosphate, di-ammonium phosphate, tripotassium phosphate, trisodium phosphat
  • BOF steel slag powder into a cement-free cementitious materials with the addition of a phosphate compound selected from the group of monopotassium phosphate, monosodium phosphate, monoammonium phosphate, dipotassium phosphate, disodium phosphate, di- ammonium phosphate, tripotassium phosphate, trisodium phosphate, tri-ammonium phosphate, or a combination thereof, satisfying the requirement of strength development and environmental protection.
  • a phosphate compound selected from the group of monopotassium phosphate, monosodium phosphate, monoammonium phosphate, dipotassium phosphate, disodium phosphate, di- ammonium phosphate, tripotassium phosphate, trisodium phosphate, tri-ammonium phosphate, or a combination thereof, satisfying the requirement of strength development and environmental protection.
  • the total amount of monopotassium phosphate, monosodium phosphate and/or monoammonium phosphate is at most 15 wt.%, preferably at most 10 wt.%, based on the amount of Basic Oxygen Furnace (BOF) steel slag minerals.
  • BOF Basic Oxygen Furnace
  • the total amount of dipotassium phosphate, disodium phosphate, di- ammonium phosphate, tripotassium phosphate, trisodium phosphate and/or tri-ammonium phosphate is at most 10 wt.%, preferably at most 5 wt.%, based on the amount of Basic Oxygen Furnace (BOF) steel slag minerals.
  • BOF Basic Oxygen Furnace
  • the activator is a phosphate compounds selected from the group consisting of: monopotassium phosphate, dipotassium phosphate, tripotassium phosphate, monosodium phosphate, disodium phosphate, or a combination thereof.
  • monopotassium phosphate dipotassium phosphate
  • tripotassium phosphate monosodium phosphate
  • disodium phosphate or a combination thereof.
  • dipotassium phosphate and tripotassium phosphate provide even better leaching results, at least for vanadium and chromium, compared to monopotassium phosphate. All these components as activator provide leaching properties of vanadium and chromium within the limits of the Dutch Soil Quality Decree, 2007, “Regeling Bodemkwaliteit”, Annex A, as part of section 3.3. (viz. SQD limit values: V ⁇ 1.80 mg/kg, and Cr ⁇ 0.63 mg/kg).
  • the method for activating Basic Oxygen Furnace (BOF) steel slag minerals further comprises a step of adding water to the mixture of activator and Basic Oxygen Furnace (BOF) steel slag minerals.
  • the method for activating Basic Oxygen Furnace (BOF) steel slag minerals further comprises a step of mixing water with the activator in the form of a phosphate compound, and a subsequent step of adding the mixture thus obtained to Basic Oxygen Furnace (BOF) steel slag minerals.
  • the water to solid ratio is at most 0.25, preferably at most 0.22, and more preferably at most 0.20, and wherein solid refers to the amount of Basic Oxygen Furnace (BOF) steel slag minerals and activator in the form of a phosphate compound.
  • the water to solid ratio is at least 0.10.
  • the Basic Oxygen Furnace (BOF) steel slag minerals are milled in such a way that the D50 average grain size of Basic Oxygen Furnace (BOF) steel slag minerals is at most 25 microns, and preferably is at most 20 microns, and more preferably is at most 17 microns.
  • the term “D50” refers to the mean or average particle diameter, considered to be the average particle size by mass.
  • An D50 of 25 microns means the average particle diameter is 25 microns; it also means that 50% of the sample mass consists of particles smaller than 25 microns, and 50% are bigger.
  • the D50 does not exceed at most 25 microns to increase the exposure of the hydrating phases to the activator, to reduce the reaction time and to improve the homogeneity of the product.
  • the inventor has found that, although a lower D50 value is appreciated, excellent results may be obtained when the D50 has a lower limit of at most 10 microns.
  • the D90 average grain diameter is at most 35 microns, and preferably at most 30 microns.
  • the particle size distribution of BOF steel slag minerals may be measured for example by laser diffraction technique (e.g., Mastersizer2000, Malvern).
  • the BOF steel slag comprises 35 - 60 wt.% CaO, 10 - 17 wt.% SiO 2 , 15 - 35 wt.% of ZFe Oxides, 1 - 5 wt.% AI 2 O 3 , 1 - 13 wt.% MgO, 0 - 4 wt.% P 2 O 5 , 0 - 2 wt.% TiO 2 , and balance impurities.
  • a steel slag mixture or paste comprising of the combination of BOF steel slag minerals, the activator in the form of a phosphate compound as herein described and claimed and water alone.
  • the steel slag mixture may be used to prepare building products or building materials with excellent compressive strength.
  • the building products or building materials have a seven-day compressive strength and/or a twenty eight-day compressive strength of at least 20.0 MPa and 35.0 MPa, respectively.
  • the building products or building materials have a twenty eight-day compressive strength of at least 40 MPa.
  • the steel slag mixture typically has a water to solid ratio of at most 0.25.
  • the steel slag mixture may comprise further additions such as sand, gravel and/or limestone, resulting in a mortar or concrete like mixture. This allows for a wider application of the BOF steel slag minerals in high end building products, thereby providing the potential to significantly reduce landfilled BOF steel slag.
  • a method for preparing a building product comprising the steps of: a) providing Basic Oxygen Furnace (BOF) steel slag minerals; and b) optionally providing solid additions, such as sand, gravel and/or limestone; c) adding an aqueous solution of the activator comprising a phosphate compound as herein described and claimed; d) mixing the ingredients of step a) to c) to obtain the steel slag mixture paste according to the specification above; e) applying the steel slag mixture or steel slag paste in a mould; f) curing the steel slag mixture or steel slag paste to obtain the building product.
  • BOF Basic Oxygen Furnace
  • the method according to the invention as such can be used to produce high strength prefabricated building elements or building products at ambient conditions.
  • the BOF steel slag minerals are activated with the activator in the form of a phosphate compound, thereby obtaining a high performance of the resulting building product, e.g. high compressive strength, low porosity and very limited leaching of heavy metals, if any.
  • the solid ingredients may be added in any order and are mixed with an aqueous solution of the activator comprising a phosphate compound.
  • a steel slag mixture composed of the combination of BOF steel slag minerals, the activator in the form of a phosphate compound and water alone is commonly referred to as a paste.
  • a steel slag mixture composed of the combination of BOF steel slag minerals, the activator in the form of a phosphate compound, water and sand (commonly about 2/3 by mass being sand) is commonly referred to as a mortar.
  • a homogeneous steel slag mixture is obtained, which can be added to a mould.
  • the method can be carried out at ambient conditions and no special curing conditions are required. Sufficient workability of the mixture is reflected in homogenous distribution of the phases in the hydrated mixture, sufficient spreadflow of the mixture, as well as the low porosity of the final shaped building product.
  • a method for preparing a building product comprising the steps of: a) providing Basic Oxygen Furnace (BOF) steel slag minerals; b) optionally providing solid additions, such as sand, gravel and/or limestone; c) providing an activator comprising a phosphate compound as herein described and claimed, and mixing the ingredients of step a) to c); d) adding water; e) mixing the ingredients of step a) - d) to obtain the steel slag mixture (paste or mortar) according to the specification above; f) applying the steel slag mixture in a mould; g) curing the steel slag mixture to obtain the building product.
  • BOF Basic Oxygen Furnace
  • the slag mixture is preferably setting in the mould within a desirable setting time, wherein the setting time ranges between 1 - 72 hours.
  • the setting time is related to the amount of activator and water added.
  • the setting time is preferably at least about 1 hour, to allow the worker to mould the slag mixture in its desired shape.
  • the setting time is preferably at most about 24 hours.
  • the leaching properties of the building products are within the limits of the Dutch Soil Quality Decree, 2007, “Regeling Bodemkwaliteit”, Annex A, as part of section 3.3. (viz. SQD limit values: V ⁇ 1.80 mg/kg, and Cr ⁇ 0.63 mg/kg).
  • a premix kit i.e. in a dry form, for obtaining a building product comprising of the BOF steel slag and an activator in the form of a phosphate compound, wherein the phosphate compound ranges between 0.10 and 15 wt.%, preferably between 0.10 and 10 wt.%, and more preferably between 0.10 and 5 wt.%, by mass of BOF steel slag minerals.
  • the BOF steel slag minerals and the phosphate compound activator are as herein described and claimed.
  • the premix kit can be used to instantaneously prepare a high-end shaped building product by adding water, and mixing and curing as known in the art.
  • Fig. 1 shows (a) the particle size distribution of BOF steel slag used, and (b) the cumulative particle size distribution.
  • Fig. 3 shows (a) cumulative heat evolution and (b) heat flow of BOF steel slag pastes with dosages of monopotassium phosphate (MKP) varying from 0 to 10 wt.%.
  • MKP monopotassium phosphate
  • Fig. 4 is XRD data of hydrated samples with dosages of monopotassium phosphate (MKP) (Legend: B-Brownmillerite, L-Larnite, M-Magnetite, W-Wuestite, H-Hydrogarnet, Ht-Hydrotalcite).
  • MKP monopotassium phosphate
  • Fig. 5 is the FTIR spectra of BOF steel slag pastes after 28 days of hydration.
  • Fig. 9 is XRD data of hydrated samples with 2 wt.% dosages of dipotassium phosphate (DKP) (Legend: H-Hydrogarnet, Ht-Hydrotalcite).
  • DKP dipotassium phosphate
  • Fig. 12 is the compressive strength of the BOF steel slag pastes with dosages of monopotassium phosphate (MKP), dipotassium phosphate (DKP), tripotassium phosphate (DKP), and combinations thereof after 7 days and 28 days curing.
  • MKP monopotassium phosphate
  • DKP dipotassium phosphate
  • DKP tripotassium phosphate
  • Table 1 relates to the mineralogical and chemical composition of typical BOF steel slag used for these investigations.
  • Table 2 relates to average chemical composition of the main phases in 28-days hydrated BOF steel slag.
  • Table 3 relates to leaching of inorganic contaminants measured by one stage batch leaching test and the SQD limit values as specified in the Dutch Soil Quality Decree.
  • Table 4 relates to leaching of inorganic contaminants measured by one stage batch leaching test on 28-days cured BOF steel slag pastes and the SQD limit values as specified in the Dutch Soil Quality Decree.
  • Table 5 relates to leaching of inorganic contaminants measured by one stage batch leaching test on 14 days carbonated BOF steel slag pastes and the SQD limit values as specified in the Dutch Soil Quality Decree.
  • Table 6 relates to the porosity of dipotassium phosphate (DKP) activated BOF steel slag before and after carbonation against non-activated BOF steel slag.
  • DKP dipotassium phosphate
  • Table 7 relates to the phase composition of dipotassium phosphate (DKP) activated BOF steel slag after 28-days hydration.
  • DKP dipotassium phosphate
  • Table 8 relates to the dosages of MKP, DKP, TKP, and some combinations tested for the compressive strength after 7- and 28-days curing.
  • BOF steel slag contains considerable C 2 S and C 2 F and X-ray amorphous accounting for in this example about 65-70 wt.% in total of the mineral compounds as shown in Table 1 , which are the targeted phases to be activated.
  • the BOF steel slag is ground for 15 minutes using disc mill to obtain a median grain size of about 17 microns as shown in Fig. 1 , in order to expose the hydrating phases.
  • Monopotassium phosphate (MKP) is first chosen as the activator, which may be used also as a fertilizer, food additive, or buffering agent in other technical fields.
  • the maximum addition of monopotassium phosphate is 15 wt.%, and preferably maximum 10 wt.%, by the mass of BOF steel slag.
  • Monopotassium phosphate is mixed with BOF steel slag powder directly to obtain a homogenous distribution and then the water is added with a water to solid ratio of 0.2.
  • the operation is conducted at ambient conditions and no special curing conditions are required.
  • the prepared specimens gain a 7-days compressive and a 28-days compressive strength up to 19.8 MPa and 44.5 MPa, respectively (Fig. 2).
  • the setting time varies from 3 minutes to 24 hours or even longer, depending on the addition amount of monopotassium phosphate.
  • the addition of monopotassium phosphate promotes the dissolution and hydration of C 2 F and C 2 S and then enhances the mechanical properties in comparison to reference samples, in line with the high heat release shown in Fig. 3.
  • the main hydration products are hydrotalcite, hydrogarnet, C-S- H gel and hydroxyapatite-like minerals as shown in Fig. 4 and Fig. 5, which is further confirmed by thermogravimetric analysis (Fig. 6). Meanwhile, leaching of BOF steel slag pastes after 28 days of hydration fulfills the legislation requirements (Table 3), which can be explained by the incorporation of heavy metals in the hydration products (Table 2).
  • the prepared specimens gain a 7-day compressive and a 28-day compressive strength up to 26.7 MPa and 42.5 MPa, respectively (see Fig. 8). Similar to monopotassium phosphate, the addition of dipotassium phosphate promotes the formation of hydrotalcite, hydrogarnet, C-S-H gel and hydroxyapatite-like minerals as shown in Fig. 9 and Fig. 10.
  • the high carbonation resistance of dipotassium phosphate- activated BOF steel slag has been proved via thermogravimetric analysis, which shows minor changes after 14-days carbonation comparing to the reference sample. Additionally, both leaching behavior of 28-days hydrated BOF steel slag pastes before and after 14-days carbonation fulfills the legislation requirements (Table 4 and Table 5).
  • the present method for activating Basic Oxygen Furnace (BOF) steel slag minerals can be used to produce high-strength prefabricated building elements with high carbonation resistance at ambient conditions.
  • BOF Basic Oxygen Furnace
  • the elemental composition is determined by the XRF (fused beads method).
  • the mineralogical composition of BOF steel slag is analyzed by X-ray diffraction (D2 PHASER X-ray Diffractometer equipped with Co X-ray tube) with Corundum external standard method. Samples were scanned on a rotating stage (with a spinning speed of 10 rpm) using a step size of 0.02° and a time per step of 2 s for a 20 range of 7-90°. Quantitative Rietveld refinement was performed with TOPAS Academic software v5.0.
  • the oxide composition of the phases in the hydrated BOF steel slag is derived from PARC results (PhAse Recognition and Characterization) as described by C. vanHoek et aL, in “Large- Area Phase Mapping Using PhAse Recognition and Characterization (PARC) Software”, Microscopy- Today, September 2016, pp.12-20.
  • the batch leaching test was performed on the 28-days cured steel slag pastes according to EN 12457-2 (one stage batch leaching test). Obtained elements concentrations were compared with the limit values specified in the Dutch Soil Quality Decree.
  • the batch leaching test was performed on the 28-days cured slag pastes according to EN 12457-2 (one stage batch leaching test). Obtained elements concentrations were compared with the limit values specified in the Dutch Soil Quality Decree.
  • the elemental composition is determined using a D4 ENDEAVOR X-ray Diffractometer equipped with a LynxEye detector and a Co X-ray tube (operating at 40KV and 40 mA).
  • the diffraction measurements were performed with a step size of 0.019° and a counting time of 1 second per step.
  • Variable divergence slits (V20) were employed, and the scanning range covered 10 to 90 °20.
  • the reference sample in comparison to the monopotassium phosphate-activated BOF steel slag was prepared using a mixer with a water to solid ratio of 0.2, which is 0.18 for the reference sample in comparison to the dipotassium phosphate-activated BOF slag based on the results from preliminary experiments.
  • the BOF steel slag powder was first mixed with water at a low speed for 30 s and then subsequently manually homogenized for another 30 s, followed by another mixing for 60 s with a high speed.
  • Monopotassium phosphate whose amount is equivalent to 2.5, 5, 10 wt.% of BOF steel slag, was first mixed with BOF steel slag powder in a mixer at a low speed for 30 s to obtain a homogenous distribution. Water was then added to the dry mixture with a water to solid ratio (BOF steel slag plus monopotassium phosphate) of 0.2. Mixing for 30 s with a low speed, subsequently manual homogenization for another 30 s and then mixing for 60 s with a high speed was applied to obtain the monopotassium phosphate-activated BOF steel slag paste. The fresh BOF steel slag paste was cast into foam molds (40x40x160 mm) and then covered with plastic film before demolding.
  • the samples with 5 wt.% and 10 wt.% can be demolded after 24 hours while the samples with 0 wt.% and 2.5 wt.% need to be demolded carefully after 7 days to ensure sufficient hardening. Afterwards, the pastes were demolded, covered with the foil, and cured in the air at ambient temperature until the testing age. The 7-days and 28-days compressive strength was determined according to EN 196-1 , in three replicates for each composition.
  • the samples described here are based on the amount of monopotassium phosphate added, as MKPO, MKP2.5, MKP5, MKP10 for 0, 2.5, 5, 10 wt.% of monopotassium phosphate dosage, respectively.
  • Dipotassium phosphate whose amount is equivalent to 1 , 2 and 3 wt.% of BOF steel slag, was first added to the water to ensure a homogenous dispersion prior to the mixing.
  • the water to solid (BOF slag + DKP) ratio is 0.18.
  • the BOF steel slag powder was first mixed with dipotassium phosphate solution at a low speed for 30 s and then subsequently manually homogenized for another 30 s, followed by another mixing for 60 s with a high speed to obtain the dipotassium phosphate-activated BOF steel slag paste.
  • the fresh BOF steel slag paste was cast into foam molds (40x40x160 mm) and then covered with plastic film before demolding after 3 days to ensure sufficient hardening. Afterwards, the pastes were demolded, covered with the foil, and cured in the air at ambient temperature until the testing age. The 7-days and 28-days compressive strength was determined according to EN 196-1 , in three replicates for each composition.
  • the samples described here are based on the amount of dipotassium phosphate added, as DKP0, DKP1 , DKP2, DKP3 for 0, 1 , 2, 3 wt.% of DKP dosage, respectively.
  • Dipotassium phosphate-activated BOF steel slag specimen and the corresponding reference BOF slag specimen were chosen for the test of carbonation resistance. After 28-days curing, the samples were placed in a CO 2 chamber with a CO 2 concentration of 20% and a relative humidity of 80% for 3 days and 14 days. The labels of the carbonated samples are based on the carbonation period. For instance, CDKP0-3d is the sample with 0 wt.% DKP after 3-days carbonation.
  • the samples were crushed manually to pass a sieve of 4 mm and then immersed in isopropanol for 24 hours to eliminate hydration, followed by drying in an oven at 45°C until a constant mass. All dried samples were ground finely to pass a sieve of 68 pm and then stored in desiccators, using a drying agent (CaCI 2 pellets) and sodium hydroxide pellets as a CO 2 trap until further testing.
  • a drying agent CaCI 2 pellets
  • sodium hydroxide pellets as a CO 2 trap until further testing.
  • the compressive strength has been measured for a further series of samples having no phosphate compound (REF), or a defined amount of monopotassium phosphate (MKP), dipotassium phosphate (DKP), tripotassium phosphate (TKP), a mixture of MKP+DKP and of DKP+TKP.
  • the amounts of phosphate compound(s) added are listed in Table 8 and the water to solid ratio is 0.18 for the samples comprising MKP, DKP, TKP or combinations thereof and 0.2 for the REF sample, and the results are shown in Fig. 12.
  • the 7-days and 28-days compressive strength was determined again according to EN 196-1 , in three replicates for each composition.
  • BOF steel slag can be activated with small amounts of a specific group of phosphate compounds, and preferably selected from the group consisting of monopotassium phosphate, dipotassium phosphate, tripotassium phosphate, or combinations thereof. From the results of Fig. 2 and Fig. 8 it can be seen that monopotassium phosphate and dipotassium phosphate can provide about the same compressive strength levels and where dipotassium phosphate requires a lower amount to be added to achieve about the same results. Similar or better results have been found for tripotassium phosphate (Fig. 12).
  • dipotassium phosphate A combination of dipotassium phosphate and tripotassium phosphate resulted in the highest compressive strength levels. And from the results of Table 3-5 it can be seen that dipotassium phosphate provides even better leaching results, at least for vanadium and chromium, compared to monopotassium phosphate. Similar results have been found for tripotassium phosphate.
  • the products obtained according to the present method provide adequate strength for the application as building materials with the addition of a specific group of phosphate compounds, and most preferably selected monopotassium phosphate, dipotassium phosphate, tripotassium phosphate, or combinations thereof.
  • the inventor also found a significantly improved carbonation resistance and a controllable leaching behavior of heavy metals, in particular of vanadium and chromium, before and after carbonation.
  • Table 5 Leaching of inorganic contaminants measured by one stage batch leaching test and the SQD limit values.
  • Table 7 The phase composition of DKP activated BOF steel slag samples after 28-days hydration.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Inorganic Chemistry (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Curing Cements, Concrete, And Artificial Stone (AREA)

Abstract

L'invention concerne un procédé d'activation de minéraux de scories d'acier de four à oxygène basique (BOF) comprenant une étape d'ajout d'un activateur aux minéraux de scories d'acier de four à oxygène basique (BOF), l'activateur étant un composé de phosphate choisi dans le groupe constitué par : le phosphate monopotassique, le phosphate monosodique, le phosphate de monoammonium, le phosphate dipotassique, le phosphate disodique, le phosphate de di-ammonium, le phosphate tripotassique, le phosphate trisodique, le phosphate de tri-ammonium, ou une combinaison de ceux-ci. L'invention concerne en outre un kit de prémélange comprenant les minéraux de scories d'acier de BOF activés, ainsi que des matériaux de construction basés sur les minéraux de scories d'acier de BOF activés.
EP23768185.3A 2022-09-09 2023-09-04 Procédé d'activation de scories d'acier de four à oxygène basique Pending EP4584231A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
NL2032992A NL2032992B1 (en) 2022-09-09 2022-09-09 Method for activating Basic Oxygen Furnace (BOF) steel slag minerals
EP23192983 2023-08-23
PCT/EP2023/074148 WO2024052265A1 (fr) 2022-09-09 2023-09-04 Procédé d'activation de scories d'acier de four à oxygène basique

Publications (1)

Publication Number Publication Date
EP4584231A1 true EP4584231A1 (fr) 2025-07-16

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EP23768185.3A Pending EP4584231A1 (fr) 2022-09-09 2023-09-04 Procédé d'activation de scories d'acier de four à oxygène basique

Country Status (4)

Country Link
EP (1) EP4584231A1 (fr)
KR (1) KR20250065620A (fr)
CN (1) CN119836407A (fr)
WO (1) WO2024052265A1 (fr)

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5553670A (en) 1993-12-30 1996-09-10 Shell Oil Company Optimizing blast furnace slag cements
US8236098B2 (en) 2010-03-24 2012-08-07 Wisconsin Electric Power Company Settable building material composition including landfill leachate

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KR20250065620A (ko) 2025-05-13
CN119836407A (zh) 2025-04-15
WO2024052265A1 (fr) 2024-03-14

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