CN109534700B - Steel slag modifier and preparation method thereof - Google Patents
Steel slag modifier and preparation method thereof Download PDFInfo
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- CN109534700B CN109534700B CN201811488012.8A CN201811488012A CN109534700B CN 109534700 B CN109534700 B CN 109534700B CN 201811488012 A CN201811488012 A CN 201811488012A CN 109534700 B CN109534700 B CN 109534700B
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- 239000002893 slag Substances 0.000 title claims abstract description 98
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 96
- 239000010959 steel Substances 0.000 title claims abstract description 96
- 239000003607 modifier Substances 0.000 title claims abstract description 44
- 238000002360 preparation method Methods 0.000 title claims abstract description 16
- KCXVZYZYPLLWCC-UHFFFAOYSA-N EDTA Chemical compound OC(=O)CN(CC(O)=O)CCN(CC(O)=O)CC(O)=O KCXVZYZYPLLWCC-UHFFFAOYSA-N 0.000 claims abstract description 11
- 239000002270 dispersing agent Substances 0.000 claims abstract description 11
- 229960001484 edetic acid Drugs 0.000 claims abstract description 11
- 229920002401 polyacrylamide Polymers 0.000 claims abstract description 11
- 239000007822 coupling agent Substances 0.000 claims abstract description 9
- 239000013543 active substance Substances 0.000 claims abstract description 7
- 239000000203 mixture Substances 0.000 claims description 30
- 229920005552 sodium lignosulfonate Polymers 0.000 claims description 13
- 239000006229 carbon black Substances 0.000 claims description 11
- 238000000034 method Methods 0.000 claims description 10
- SJECZPVISLOESU-UHFFFAOYSA-N 3-trimethoxysilylpropan-1-amine Chemical compound CO[Si](OC)(OC)CCCN SJECZPVISLOESU-UHFFFAOYSA-N 0.000 claims description 9
- HXKKHQJGJAFBHI-UHFFFAOYSA-N 1-aminopropan-2-ol Chemical compound CC(O)CN HXKKHQJGJAFBHI-UHFFFAOYSA-N 0.000 claims description 7
- 229920001451 polypropylene glycol Polymers 0.000 claims description 7
- DBCAQXHNJOFNGC-UHFFFAOYSA-N 4-bromo-1,1,1-trifluorobutane Chemical compound FC(F)(F)CCCBr DBCAQXHNJOFNGC-UHFFFAOYSA-N 0.000 claims description 5
- STVZJERGLQHEKB-UHFFFAOYSA-N ethylene glycol dimethacrylate Substances CC(=C)C(=O)OCCOC(=O)C(C)=C STVZJERGLQHEKB-UHFFFAOYSA-N 0.000 claims description 5
- WYTZZXDRDKSJID-UHFFFAOYSA-N (3-aminopropyl)triethoxysilane Chemical compound CCO[Si](OCC)(OCC)CCCN WYTZZXDRDKSJID-UHFFFAOYSA-N 0.000 claims description 4
- XDLMVUHYZWKMMD-UHFFFAOYSA-N 3-trimethoxysilylpropyl 2-methylprop-2-enoate Chemical compound CO[Si](OC)(OC)CCCOC(=O)C(C)=C XDLMVUHYZWKMMD-UHFFFAOYSA-N 0.000 claims description 4
- 150000002009 diols Chemical class 0.000 claims description 4
- MQWFLKHKWJMCEN-UHFFFAOYSA-N n'-[3-[dimethoxy(methyl)silyl]propyl]ethane-1,2-diamine Chemical compound CO[Si](C)(OC)CCCNCCN MQWFLKHKWJMCEN-UHFFFAOYSA-N 0.000 claims description 4
- 230000008569 process Effects 0.000 claims description 4
- GSEJCLTVZPLZKY-UHFFFAOYSA-N Triethanolamine Chemical compound OCCN(CCO)CCO GSEJCLTVZPLZKY-UHFFFAOYSA-N 0.000 claims description 3
- NKSJNEHGWDZZQF-UHFFFAOYSA-N ethenyl(trimethoxy)silane Chemical compound CO[Si](OC)(OC)C=C NKSJNEHGWDZZQF-UHFFFAOYSA-N 0.000 claims description 3
- HWSSEYVMGDIFMH-UHFFFAOYSA-N 2-[2-[2-(2-methylprop-2-enoyloxy)ethoxy]ethoxy]ethyl 2-methylprop-2-enoate Chemical compound CC(=C)C(=O)OCCOCCOCCOC(=O)C(C)=C HWSSEYVMGDIFMH-UHFFFAOYSA-N 0.000 claims description 2
- KMBMQZQZBOLJHN-UHFFFAOYSA-N 2-methyloxirane;oxolane Chemical compound CC1CO1.C1CCOC1 KMBMQZQZBOLJHN-UHFFFAOYSA-N 0.000 claims description 2
- 239000006087 Silane Coupling Agent Substances 0.000 claims description 2
- 238000007334 copolymerization reaction Methods 0.000 claims description 2
- FWDBOZPQNFPOLF-UHFFFAOYSA-N ethenyl(triethoxy)silane Chemical compound CCO[Si](OCC)(OCC)C=C FWDBOZPQNFPOLF-UHFFFAOYSA-N 0.000 claims description 2
- 229920000909 polytetrahydrofuran Polymers 0.000 claims description 2
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 abstract description 11
- 239000000292 calcium oxide Substances 0.000 abstract description 9
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 abstract description 6
- 239000000463 material Substances 0.000 description 18
- 239000000843 powder Substances 0.000 description 16
- 239000004568 cement Substances 0.000 description 11
- 230000000052 comparative effect Effects 0.000 description 9
- 230000000694 effects Effects 0.000 description 9
- 230000004048 modification Effects 0.000 description 9
- 238000012986 modification Methods 0.000 description 9
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 8
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 6
- 239000011575 calcium Substances 0.000 description 6
- 229910052791 calcium Inorganic materials 0.000 description 6
- 239000000126 substance Substances 0.000 description 6
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 5
- 230000008859 change Effects 0.000 description 5
- 229910052500 inorganic mineral Inorganic materials 0.000 description 5
- 239000011707 mineral Substances 0.000 description 5
- 238000002156 mixing Methods 0.000 description 5
- 239000000047 product Substances 0.000 description 5
- 230000009467 reduction Effects 0.000 description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- 238000012360 testing method Methods 0.000 description 4
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 description 3
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 description 3
- 238000003723 Smelting Methods 0.000 description 3
- 239000003795 chemical substances by application Substances 0.000 description 3
- 238000001816 cooling Methods 0.000 description 3
- 229910052742 iron Inorganic materials 0.000 description 3
- 239000000395 magnesium oxide Substances 0.000 description 3
- 239000012071 phase Substances 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- CJZGTCYPCWQAJB-UHFFFAOYSA-L calcium stearate Chemical compound [Ca+2].CCCCCCCCCCCCCCCCCC([O-])=O.CCCCCCCCCCCCCCCCCC([O-])=O CJZGTCYPCWQAJB-UHFFFAOYSA-L 0.000 description 2
- 235000013539 calcium stearate Nutrition 0.000 description 2
- 239000008116 calcium stearate Substances 0.000 description 2
- GVGUFUZHNYFZLC-UHFFFAOYSA-N dodecyl benzenesulfonate;sodium Chemical compound [Na].CCCCCCCCCCCCOS(=O)(=O)C1=CC=CC=C1 GVGUFUZHNYFZLC-UHFFFAOYSA-N 0.000 description 2
- 239000010881 fly ash Substances 0.000 description 2
- 125000000524 functional group Chemical group 0.000 description 2
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 229940080264 sodium dodecylbenzenesulfonate Drugs 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- USFZMSVCRYTOJT-UHFFFAOYSA-N Ammonium acetate Chemical compound N.CC(O)=O USFZMSVCRYTOJT-UHFFFAOYSA-N 0.000 description 1
- 239000005695 Ammonium acetate Substances 0.000 description 1
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 1
- 229920000663 Hydroxyethyl cellulose Polymers 0.000 description 1
- 239000004354 Hydroxyethyl cellulose Substances 0.000 description 1
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 description 1
- 239000011398 Portland cement Substances 0.000 description 1
- VMHLLURERBWHNL-UHFFFAOYSA-M Sodium acetate Chemical compound [Na+].CC([O-])=O VMHLLURERBWHNL-UHFFFAOYSA-M 0.000 description 1
- 239000004280 Sodium formate Substances 0.000 description 1
- 229930006000 Sucrose Natural products 0.000 description 1
- CZMRCDWAGMRECN-UGDNZRGBSA-N Sucrose Chemical compound O[C@H]1[C@H](O)[C@@H](CO)O[C@@]1(CO)O[C@@H]1[C@H](O)[C@@H](O)[C@H](O)[C@@H](CO)O1 CZMRCDWAGMRECN-UGDNZRGBSA-N 0.000 description 1
- 235000011941 Tilia x europaea Nutrition 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- CSDREXVUYHZDNP-UHFFFAOYSA-N alumanylidynesilicon Chemical compound [Al].[Si] CSDREXVUYHZDNP-UHFFFAOYSA-N 0.000 description 1
- 150000004645 aluminates Chemical class 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
- 229940043376 ammonium acetate Drugs 0.000 description 1
- 235000019257 ammonium acetate Nutrition 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 239000000378 calcium silicate Substances 0.000 description 1
- 229910052918 calcium silicate Inorganic materials 0.000 description 1
- -1 calcium-aluminum-silicon Chemical compound 0.000 description 1
- OYACROKNLOSFPA-UHFFFAOYSA-N calcium;dioxido(oxo)silane Chemical compound [Ca+2].[O-][Si]([O-])=O OYACROKNLOSFPA-UHFFFAOYSA-N 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 229910052681 coesite Inorganic materials 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 229910052593 corundum Inorganic materials 0.000 description 1
- 229910052906 cristobalite Inorganic materials 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- YDEXUEFDPVHGHE-GGMCWBHBSA-L disodium;(2r)-3-(2-hydroxy-3-methoxyphenyl)-2-[2-methoxy-4-(3-sulfonatopropyl)phenoxy]propane-1-sulfonate Chemical compound [Na+].[Na+].COC1=CC=CC(C[C@H](CS([O-])(=O)=O)OC=2C(=CC(CCCS([O-])(=O)=O)=CC=2)OC)=C1O YDEXUEFDPVHGHE-GGMCWBHBSA-L 0.000 description 1
- 239000000706 filtrate Substances 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000004108 freeze drying Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 235000019447 hydroxyethyl cellulose Nutrition 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N iron oxide Inorganic materials [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 239000004571 lime Substances 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000002715 modification method Methods 0.000 description 1
- 235000013379 molasses Nutrition 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 150000002927 oxygen compounds Chemical class 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 229920000515 polycarbonate Polymers 0.000 description 1
- 239000004417 polycarbonate Substances 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 235000012239 silicon dioxide Nutrition 0.000 description 1
- 150000003385 sodium Chemical class 0.000 description 1
- 239000001632 sodium acetate Substances 0.000 description 1
- 235000017281 sodium acetate Nutrition 0.000 description 1
- HLBBKKJFGFRGMU-UHFFFAOYSA-M sodium formate Chemical compound [Na+].[O-]C=O HLBBKKJFGFRGMU-UHFFFAOYSA-M 0.000 description 1
- 235000019254 sodium formate Nutrition 0.000 description 1
- AKHNMLFCWUSKQB-UHFFFAOYSA-L sodium thiosulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=S AKHNMLFCWUSKQB-UHFFFAOYSA-L 0.000 description 1
- 235000019345 sodium thiosulphate Nutrition 0.000 description 1
- 239000002910 solid waste Substances 0.000 description 1
- 238000009270 solid waste treatment Methods 0.000 description 1
- 238000011895 specific detection Methods 0.000 description 1
- 238000000528 statistical test Methods 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
- 229910052682 stishovite Inorganic materials 0.000 description 1
- 229910052905 tridymite Inorganic materials 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 229910001845 yogo sapphire Inorganic materials 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
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
- C04B5/00—Treatment of metallurgical slag ; Artificial stone from molten metallurgical slag
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention belongs to the technical field of preparation of steel slag modifiers, and particularly relates to a steel slag modifier and a preparation method thereof. The steel slag modifier comprises the following components in percentage by weight: 10-30% of polyacrylamide, 8-25% of ethylene diamine tetraacetic acid, 20-50% of an active agent, 5-30% of a coupling agent and 3-12% of a dispersing agent. The steel slag modifier provided by the invention can obviously reduce the content of free calcium oxide in the steel slag.
Description
Technical Field
The invention belongs to the technical field of preparation of steel slag modifiers, and particularly relates to a steel slag modifier and a preparation method thereof.
Background
The steel slag is solid waste which is formed by using a slag former added in the process of making steel by using a converter or an electric furnace, impurities in molten steel and a furnace lining and takes silicate, ferrite and the like as main components. Since the properties (chemical composition, mineral composition and main physical properties) of steel slag vary greatly depending on many factors such as the burden, the type of steel being smelted and the method of operation, there is no particularly effective method for direct treatment. Many iron and steel enterprises only simply recycle the metal resources in the steel slag, and the remaining tailings cannot completely realize zero emission, so that the first problem of solid waste treatment of the iron and steel smelting plant is solved.
The chemical composition and mineral composition of steel slag vary with the steel-making process (converter, arc furnace, refining furnace), steel-smelting type, etc., but the main chemical components are CaO, SiO2 and Al2O3、FeO、Fe2O3、MgO、MnO、P2O5f-CaO, Fe, etc., the steel slag has chemical and mineral compositions similar to those of common cementing materials such as portland cement clinker, slag and fly ash, and has certain gelling activity after being ground, so the steel slag is often used as an auxiliary cementing material for preparing cement concrete materials, etc. However, when steel slag and cement clinker are directly mixed for use, the stability, structural stability and other properties of the mixed material are affected due to the problems of low activity and the like.
Therefore, in actual production, the steel slag is mostly modified and then used, for example, students use lime, electric furnace reducing slag, coal slag, fly ash and the like to reconstruct and modify the steel slag, research the phase evolution law of the steel slag and the change of the gelling property in the high-temperature reconstruction process, and find that the calcareous adjusting material can promote the formation of A ore and B ore in the reconstructed steel slag; the calcium-aluminum-silicon adjusting material can better promote the formation of calcium silicate and calcium aluminoferrite in the reconstructed steel slag and obviously improve the gelling activity of the reconstructed steel slag; the silicon-aluminum adjusting material can promote the absorption of f-CaO and increase the content of aluminate minerals in the reconstructed steel slag.
The researchers also adopt a direct reduction method and a smelting reduction method to reconstruct and modify the steel slag by a high-temperature furnace provided with a nitrogen protection device, so that not only RO phase in the steel slag and Fe phase in liquid phase are modified2O3Reduction to metallic iron, modification of steel slag gelationThe activity is also obviously improved.
However, the modification method has higher requirements on the performances of corrosion resistance and the like of equipment, and the process is complex, so that the recycling cost of the steel slag is increased; patent CN107487999A discloses that the steel slag modifier is used to modify the performance of steel slag, and the modified steel slag powder has good activity and chemical stability, low cost and no corrosiveness. However, the steel slag modified by the modifier still has high free calcium content, and cannot meet the requirement of actual production.
Disclosure of Invention
In order to solve the above problems in the prior art, an object of the present invention is to provide a slag modifier which can significantly reduce the content of free calcium oxide in steel slag and improve the activity of steel slag.
The invention also aims to provide a preparation method of the steel slag modifier.
In order to achieve the above purpose, the invention provides the following technical scheme:
a steel slag modifier comprises the following components in percentage by weight: 10-30% of polyacrylamide, 8-25% of ethylene diamine tetraacetic acid, 20-50% of an active agent, 5-30% of a coupling agent and 3-12% of a dispersing agent.
Preferably, the steel slag modifier comprises the following components in percentage by weight: 10-25% of polyacrylamide, 8-18% of ethylene diamine tetraacetic acid, 25-50% of an active agent, 8-30% of a coupling agent and 5-12% of a dispersing agent.
Preferably, the active agent is one or more of ethylene glycol dimethacrylate, triethanolamine, diethanol monoisopropanolamine, triethylene glycol dimethacrylate, ethylene glycol dimethacrylate, polyoxypropylene glycol, polytetrahydrofuran diol and tetrahydrofuran-propylene oxide copolymerization diol.
Preferably, the coupling agent is one or more of silane coupling agents 3-aminopropyltrimethoxysilane, gamma-aminopropyltriethoxysilane, N- (beta-aminoethyl) -gamma-aminopropylmethyldimethoxysilane, 3- (methacryloyloxy) propyltrimethoxysilane, vinyltrimethoxysilane and vinyltriethoxysilane.
Further preferably, the coupling agent is one or more of 3-aminopropyltrimethoxysilane, gamma-aminopropyltriethoxysilane, N- (beta-aminoethyl) -gamma-aminopropylmethyldimethoxysilane and 3- (methacryloyloxy) propyltrimethoxysilane.
Preferably, the dispersing agent is one or more of carbon black, calcium stearate, sodium lignin sulfonate and a modified substance thereof, hydroxyethyl cellulose and sodium dodecyl benzene sulfonate.
Further preferably, the dispersant is a mixture of carbon black and sodium lignosulfonate. The carbon black has a porous structure similar to that of activated carbon, and simultaneously has a large number of surface functional groups, and can be jointly connected with sodium lignosulfonate through the surface functional groups to be adsorbed on the surfaces of other additives of the modifier so as to play a role of a flexible connecting material.
Still more preferably, the dispersant is carbon black and sodium lignosulfonate in a ratio of 1-8: 1.
When the proportion of the carbon black and the sodium lignosulfonate is in the range, the steel slag modifier can obviously improve the activity of the modified steel slag; when the above range is exceeded, the activity of the modified steel slag does not significantly change.
Preferably, the preparation method of the sodium lignosulfonate modification product comprises the following steps: selecting sodium lignosulfonate with molecular weight of 5000-7000, adjusting pH to 4-6 with acid liquor, boiling for 1-4 hours at 80-150 ℃, filtering, and freeze-drying the obtained filtrate to obtain the modified sodium lignosulfonate.
The invention also provides a preparation method of the steel slag modifier, which comprises the following steps:
the components weighed according to the weight ratio are uniformly mixed, then the mixture is introduced with steam and stirred for 1 to 3 hours at the temperature of 120-220 ℃, then the temperature is reduced to 60 to 80 ℃, the mixture is stirred until the mass is not changed, and the mixture is cooled to the room temperature, thus obtaining the product.
Compared with the prior art, the invention has the beneficial effects that:
1) the steel slag modifier provided by the invention can obviously accelerate free calcium oxide and free calcium oxideSynthesis of C from acidic oxygen compound in magnesium oxide and steel slag powder2S、C3S、C3A、C3AF and other minerals, thereby effectively reducing the existence of free-Ca0 and Mg0 in the steel slag powder; test results show that the steel slag modification provided by the embodiments 1-4 of the invention can reduce free magnesium oxide in the steel slag by more than 45%;
2) when the doping amount of the steel slag powder modified by the steel slag modifier provided by the invention reaches 30%, the mechanical property of the cement base material in 28 days is basically close to that of the cement base material.
Detailed Description
In order to make the purpose and technical solution of the embodiments of the present invention clearer, the technical solution of the present invention will be clearly and completely described below with reference to the embodiments of the present invention.
Example 1
A steel slag modifier comprises the following components in percentage by weight:
30% of polyacrylamide, 25% of ethylene diamine tetraacetic acid, 23% of ethylene glycol dimethacrylate, 10% of 3-aminopropyl trimethoxysilane and 12% of sodium dodecyl benzene sulfonate.
The preparation method of the steel slag modifier comprises the following steps:
the components weighed according to the weight ratio are uniformly mixed, then the mixture is introduced with water vapor and stirred for 1.5 hours at the temperature of 200 ℃, then the temperature is reduced to 60 ℃, the mixture is stirred until the mass does not change, and the mixture is cooled to the room temperature, thus obtaining the product.
Example 2
A steel slag modifier comprises the following components in percentage by weight:
15% of polyacrylamide, 12% of ethylene diamine tetraacetic acid, 24% of polyoxypropylene glycol, 21% of diethanol monoisopropanolamine, 23% of 3-aminopropyltrimethoxysilane and 5% of calcium stearate.
The preparation method of the steel slag modifier comprises the following steps:
the components weighed according to the weight ratio are uniformly mixed, then the mixture is introduced with water vapor and stirred for 3 hours at the temperature of 180 ℃, then the temperature is reduced to 60 ℃, the mixture is stirred until the mass does not change, and the mixture is cooled to the room temperature, thus obtaining the product.
Example 3
A steel slag modifier comprises the following components in percentage by weight:
15% of polyacrylamide, 12% of ethylene diamine tetraacetic acid, 24% of polyoxypropylene glycol, 21% of diethanol monoisopropanolamine, 23% of 3-aminopropyltrimethoxysilane, 2% of carbon black and 3% of sodium lignosulfonate.
The preparation method of the steel slag modifier comprises the following steps:
the components weighed according to the weight ratio are uniformly mixed, then the mixture is introduced with water vapor and stirred for 3 hours at the temperature of 180 ℃, then the temperature is reduced to 60 ℃, the mixture is stirred until the mass does not change, and the mixture is cooled to the room temperature, thus obtaining the product.
Example 4
A steel slag modifier comprises the following components in percentage by weight:
15% of polyacrylamide, 12% of ethylene diamine tetraacetic acid, 24% of polyoxypropylene glycol, 21% of diethanol monoisopropanolamine, 23% of vinyl trimethoxy silane, 2% of carbon black and 3% of sodium lignosulfonate.
The preparation method of the steel slag modifier is basically the same as that of the example 3.
Comparative example 1
A steel slag modifier comprises the following components in percentage by weight:
15% of polyacrylamide, 12% of ethylene diamine tetraacetic acid, 24% of polyoxypropylene glycol, 21% of diethanol monoisopropanolamine, 23% of 3-aminopropyltrimethoxysilane, 2% of carbon black and 3% of sodium lignosulfonate.
The preparation method of the steel slag modifier comprises the following steps:
uniformly mixing the components weighed according to the weight ratio with water accounting for 10 percent of the weight of the modifier, stirring at 180 ℃, then cooling to 60 ℃, mixing and stirring until the mass is not changed, and cooling to room temperature to obtain the modified polycarbonate.
Comparative example 2
A steel slag modifier comprises the following components in percentage by weight:
29% of polyacrylamide, 12% of ethylene diamine tetraacetic acid, 10% of polyoxypropylene glycol, 21% of diethanol monoisopropanolamine, 23% of 3-aminopropyltrimethoxysilane, 2% of carbon black and 3% of sodium lignosulfonate.
The preparation method of the steel slag modifier is basically the same as that of the example 3.
Comparative example 3
A steel slag modifier for replacing clinker by waste steel slag is prepared from the following components in parts by weight: uniformly mixing 10% of sodium thiosulfate, 5% of sodium acetate, 7% of modified triethanolamine, 3% of white sugar, 5% of ammonium acetate, 2% of sodium formate, 10% of glycerol, 5% of molasses, 2% of dispersing agent and 51% of water to obtain the steel slag modifying agent.
Effect test
1. Test of influence of slag modifier on free calcium in steel slag
Mixing the dried steel slag powder and the steel slag modifier prepared in the examples 1-4 and the comparative examples 1-3 according to the mass ratio of 1: 1, mixing to form a mixture, then carrying out heat treatment at the constant temperature of 800 ℃ for two hours, cooling to room temperature, and then determining the content of free calcium in each mixed sample by adopting a free calcium oxide determination method (ethylene glycol method) (the specific detection steps refer to Master thesis 'test research on modification of steel slag and influence of steel slag on performance of cement base materials'). The percent reduction in free calcium oxide in the various mixed samples was recorded. The results are shown in table 1 below.
TABLE 1 influence of slag modifiers on free calcium in steel slag
| Heat treating the sample | Percent reduction (%) -Ca0 |
| Steel slag powder and mixture of example 1 | 47.22 |
| Steel slag powder and mixture of example 2 | 47.31 |
| Steel slag powder and mixture of example 3 | 52.15 |
| Steel slag powder and mixture of example 4 | 51.76 |
| Steel slag powder and mixture of comparative example 1 | 33.45 |
| Mixture of Steel slag powder and comparative example 2 | 45.39 |
| Mixture of Steel slag powder and comparative example 3 | 35.22 |
As can be seen from the data in the table, the steel slag modifier prepared in the example has higher reduction degree of the content of free calcium oxide in the steel slag than that of the comparative example, and the performance of the steel slag modifier prepared in the example 3 is optimal.
2. Influence of modified steel slag powder on mechanical property of cement-based material
According to the detection method disclosed in the Master thesis of experimental research on the modification of steel slag and the influence of the steel slag modification agent on the performance of the cement base material, the steel slag powder modified by the steel slag modification agent prepared in the examples 1-4 and the comparative examples 1-3 of the application has influence on the mechanical property of the cement base material. The statistical test results (the doping amount of the modified steel slag powder in the mixed material is 30%) are shown in the following table 2.
TABLE 2 influence of modified steel slag powder on compressive strength of cement materials
As can be seen from the data in the table, the compressive strength of the cement-based material at 28d reaches the maximum value with the time, and is basically close to the mechanical property of the cement-based material.
The above are merely embodiments of the present invention, which are described in detail and with particularity, and therefore should not be construed as limiting the scope of the invention. It should be noted that, for those skilled in the art, various changes and modifications can be made without departing from the spirit of the present invention, and these changes and modifications are within the scope of the present invention.
Claims (6)
1. A steel slag modifier comprises the following components in percentage by weight: 10-30% of polyacrylamide, 8-25% of ethylene diamine tetraacetic acid, 20-50% of an active agent, 5-30% of a coupling agent and 3-12% of a dispersing agent;
the active agent is one or more of ethylene glycol dimethacrylate, triethanolamine, diethanol monoisopropanolamine, triethylene glycol dimethacrylate, ethylene glycol dimethacrylate, polyoxypropylene glycol, polytetrahydrofuran diol and tetrahydrofuran-propylene oxide copolymerization diol; the dispersing agent is a mixture of carbon black and sodium lignosulfonate.
2. The steel slag modifier according to claim 1, which comprises the following components in percentage by weight: 10-25% of polyacrylamide, 8-18% of ethylene diamine tetraacetic acid, 25-50% of an active agent, 8-30% of a coupling agent and 5-12% of a dispersing agent.
3. The steel slag modifier according to claim 1, wherein the coupling agent is one or more of silane coupling agents 3-aminopropyltrimethoxysilane, gamma-aminopropyltriethoxysilane, N- (beta-aminoethyl) -gamma-aminopropylmethyldimethoxysilane, 3- (methacryloyloxy) propyltrimethoxysilane, vinyltrimethoxysilane and vinyltriethoxysilane.
4. The steel slag modifier according to claim 3, wherein the coupling agent is one or more of 3-aminopropyltrimethoxysilane, gamma-aminopropyltriethoxysilane, N- (beta-aminoethyl) -gamma-aminopropylmethyldimethoxysilane and 3- (methacryloyloxy) propyltrimethoxysilane.
5. The steel slag modifier according to claim 1, wherein the dispersant is carbon black and sodium lignosulfonate at a ratio of 1-8: 1.
6. A process for the preparation of a steel slag modifier according to any one of claims 1 to 5, comprising the steps of:
the components weighed according to the weight ratio are uniformly mixed, then the mixture is introduced with steam and stirred for 1 to 3 hours at the temperature of 120-220 ℃, then the temperature is reduced to 60 to 80 ℃, the mixture is stirred until the mass is not changed, and the mixture is cooled to the room temperature, thus obtaining the product.
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