CN112679117A - High-performance portland cement and preparation method thereof - Google Patents
High-performance portland cement and preparation method thereof Download PDFInfo
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- CN112679117A CN112679117A CN202110115130.XA CN202110115130A CN112679117A CN 112679117 A CN112679117 A CN 112679117A CN 202110115130 A CN202110115130 A CN 202110115130A CN 112679117 A CN112679117 A CN 112679117A
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- portland cement
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- coal gangue
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- 239000011398 Portland cement Substances 0.000 title claims abstract description 109
- 238000002360 preparation method Methods 0.000 title claims abstract description 24
- 239000003245 coal Substances 0.000 claims abstract description 82
- 239000004568 cement Substances 0.000 claims abstract description 65
- 239000000463 material Substances 0.000 claims abstract description 40
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 29
- 238000000227 grinding Methods 0.000 claims abstract description 28
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 24
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 18
- 238000001035 drying Methods 0.000 claims abstract description 16
- 229910052602 gypsum Inorganic materials 0.000 claims abstract description 13
- 239000010440 gypsum Substances 0.000 claims abstract description 13
- 239000002893 slag Substances 0.000 claims description 54
- 238000002156 mixing Methods 0.000 claims description 48
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 46
- 239000010881 fly ash Substances 0.000 claims description 38
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims description 33
- 229910052804 chromium Inorganic materials 0.000 claims description 33
- 239000011651 chromium Substances 0.000 claims description 33
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 28
- 229910052710 silicon Inorganic materials 0.000 claims description 28
- 239000010703 silicon Substances 0.000 claims description 28
- 239000004594 Masterbatch (MB) Substances 0.000 claims description 26
- 238000000498 ball milling Methods 0.000 claims description 25
- 229910052742 iron Inorganic materials 0.000 claims description 23
- 239000000843 powder Substances 0.000 claims description 22
- 239000012190 activator Substances 0.000 claims description 21
- 229920000180 alkyd Polymers 0.000 claims description 21
- 238000000034 method Methods 0.000 claims description 21
- 239000003513 alkali Substances 0.000 claims description 20
- 235000019738 Limestone Nutrition 0.000 claims description 18
- 239000006028 limestone Substances 0.000 claims description 18
- 239000006087 Silane Coupling Agent Substances 0.000 claims description 16
- 238000001354 calcination Methods 0.000 claims description 14
- 239000004088 foaming agent Substances 0.000 claims description 14
- 229920001495 poly(sodium acrylate) polymer Polymers 0.000 claims description 14
- NNMHYFLPFNGQFZ-UHFFFAOYSA-M sodium polyacrylate Chemical compound [Na+].[O-]C(=O)C=C NNMHYFLPFNGQFZ-UHFFFAOYSA-M 0.000 claims description 14
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims description 13
- IMNFDUFMRHMDMM-UHFFFAOYSA-N N-Heptane Chemical compound CCCCCCC IMNFDUFMRHMDMM-UHFFFAOYSA-N 0.000 claims description 12
- 235000019353 potassium silicate Nutrition 0.000 claims description 12
- 235000019830 sodium polyphosphate Nutrition 0.000 claims description 12
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 11
- 239000002041 carbon nanotube Substances 0.000 claims description 11
- 229910021393 carbon nanotube Inorganic materials 0.000 claims description 11
- 229910052588 hydroxylapatite Inorganic materials 0.000 claims description 11
- XYJRXVWERLGGKC-UHFFFAOYSA-D pentacalcium;hydroxide;triphosphate Chemical compound [OH-].[Ca+2].[Ca+2].[Ca+2].[Ca+2].[Ca+2].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O XYJRXVWERLGGKC-UHFFFAOYSA-D 0.000 claims description 11
- 229920000052 poly(p-xylylene) Polymers 0.000 claims description 11
- 238000001816 cooling Methods 0.000 claims description 10
- 239000000203 mixture Substances 0.000 claims description 10
- 108010010803 Gelatin Proteins 0.000 claims description 9
- 239000008273 gelatin Substances 0.000 claims description 9
- 229920000159 gelatin Polymers 0.000 claims description 9
- 235000019322 gelatine Nutrition 0.000 claims description 9
- 235000011852 gelatine desserts Nutrition 0.000 claims description 9
- 238000003756 stirring Methods 0.000 claims description 9
- UFCIRBKROVJPGD-UHFFFAOYSA-N 3-hydroxyoctadec-2-enoic acid Chemical compound CCCCCCCCCCCCCCCC(O)=CC(O)=O UFCIRBKROVJPGD-UHFFFAOYSA-N 0.000 claims description 8
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims description 8
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 claims description 8
- 239000000920 calcium hydroxide Substances 0.000 claims description 8
- 229910001861 calcium hydroxide Inorganic materials 0.000 claims description 8
- CPUDPFPXCZDNGI-UHFFFAOYSA-N triethoxy(methyl)silane Chemical compound CCO[Si](C)(OCC)OCC CPUDPFPXCZDNGI-UHFFFAOYSA-N 0.000 claims description 8
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 7
- GSEJCLTVZPLZKY-UHFFFAOYSA-N Triethanolamine Chemical compound OCCN(CCO)CCO GSEJCLTVZPLZKY-UHFFFAOYSA-N 0.000 claims description 7
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 claims description 6
- DGVVJWXRCWCCOD-UHFFFAOYSA-N naphthalene;hydrate Chemical compound O.C1=CC=CC2=CC=CC=C21 DGVVJWXRCWCCOD-UHFFFAOYSA-N 0.000 claims description 6
- 239000004372 Polyvinyl alcohol Substances 0.000 claims description 5
- 239000002253 acid Substances 0.000 claims description 5
- 238000000151 deposition Methods 0.000 claims description 5
- 238000010438 heat treatment Methods 0.000 claims description 5
- 238000002844 melting Methods 0.000 claims description 5
- 230000008018 melting Effects 0.000 claims description 5
- 238000005507 spraying Methods 0.000 claims description 5
- ATRRKUHOCOJYRX-UHFFFAOYSA-N Ammonium bicarbonate Chemical compound [NH4+].OC([O-])=O ATRRKUHOCOJYRX-UHFFFAOYSA-N 0.000 claims description 4
- 229910000013 Ammonium bicarbonate Inorganic materials 0.000 claims description 4
- 235000012538 ammonium bicarbonate Nutrition 0.000 claims description 4
- 239000001099 ammonium carbonate Substances 0.000 claims description 4
- 229910000019 calcium carbonate Inorganic materials 0.000 claims description 4
- FQENQNTWSFEDLI-UHFFFAOYSA-J sodium diphosphate Chemical compound [Na+].[Na+].[Na+].[Na+].[O-]P([O-])(=O)OP([O-])([O-])=O FQENQNTWSFEDLI-UHFFFAOYSA-J 0.000 claims description 4
- 229940048086 sodium pyrophosphate Drugs 0.000 claims description 4
- 235000019832 sodium triphosphate Nutrition 0.000 claims description 4
- 235000019818 tetrasodium diphosphate Nutrition 0.000 claims description 4
- 239000001577 tetrasodium phosphonato phosphate Substances 0.000 claims description 4
- 125000000914 phenoxymethylpenicillanyl group Chemical group CC1(S[C@H]2N([C@H]1C(=O)*)C([C@H]2NC(COC2=CC=CC=C2)=O)=O)C 0.000 claims description 3
- 239000003361 porogen Substances 0.000 claims description 2
- 238000005336 cracking Methods 0.000 abstract description 10
- 239000004566 building material Substances 0.000 abstract description 2
- 238000004064 recycling Methods 0.000 abstract description 2
- 230000000052 comparative effect Effects 0.000 description 23
- 239000000126 substance Substances 0.000 description 16
- 230000036571 hydration Effects 0.000 description 11
- 238000006703 hydration reaction Methods 0.000 description 11
- 239000003469 silicate cement Substances 0.000 description 10
- 239000002245 particle Substances 0.000 description 9
- 239000000047 product Substances 0.000 description 9
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 8
- JOPOVCBBYLSVDA-UHFFFAOYSA-N chromium(6+) Chemical compound [Cr+6] JOPOVCBBYLSVDA-UHFFFAOYSA-N 0.000 description 7
- 230000000694 effects Effects 0.000 description 7
- 239000011148 porous material Substances 0.000 description 7
- 239000002994 raw material Substances 0.000 description 6
- 229910000831 Steel Inorganic materials 0.000 description 5
- 239000000292 calcium oxide Substances 0.000 description 5
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 5
- 238000006243 chemical reaction Methods 0.000 description 5
- 239000010959 steel Substances 0.000 description 5
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 4
- 229910052681 coesite Inorganic materials 0.000 description 4
- 229910052593 corundum Inorganic materials 0.000 description 4
- 229910052906 cristobalite Inorganic materials 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 4
- 238000002386 leaching Methods 0.000 description 4
- 239000000377 silicon dioxide Substances 0.000 description 4
- 229910052682 stishovite Inorganic materials 0.000 description 4
- 229910052905 tridymite Inorganic materials 0.000 description 4
- 229910001845 yogo sapphire Inorganic materials 0.000 description 4
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 description 3
- 239000011083 cement mortar Substances 0.000 description 3
- 239000002131 composite material Substances 0.000 description 3
- 238000010276 construction Methods 0.000 description 3
- 239000002002 slurry Substances 0.000 description 3
- 239000007787 solid Substances 0.000 description 3
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 2
- URLKBWYHVLBVBO-UHFFFAOYSA-N Para-Xylene Chemical group CC1=CC=C(C)C=C1 URLKBWYHVLBVBO-UHFFFAOYSA-N 0.000 description 2
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 2
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 2
- 230000003487 anti-permeability effect Effects 0.000 description 2
- 230000004888 barrier function Effects 0.000 description 2
- 239000011575 calcium Substances 0.000 description 2
- 229910052791 calcium Inorganic materials 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 150000004683 dihydrates Chemical class 0.000 description 2
- 238000003912 environmental pollution Methods 0.000 description 2
- 239000000499 gel Substances 0.000 description 2
- 239000004570 mortar (masonry) Substances 0.000 description 2
- 125000000962 organic group Chemical group 0.000 description 2
- 238000011056 performance test Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 239000002910 solid waste Substances 0.000 description 2
- 238000010025 steaming Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 229910000503 Na-aluminosilicate Inorganic materials 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 238000004220 aggregation Methods 0.000 description 1
- DIZPMCHEQGEION-UHFFFAOYSA-H aluminium sulfate (anhydrous) Chemical compound [Al+3].[Al+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O DIZPMCHEQGEION-UHFFFAOYSA-H 0.000 description 1
- ANBBXQWFNXMHLD-UHFFFAOYSA-N aluminum;sodium;oxygen(2-) Chemical compound [O-2].[O-2].[Na+].[Al+3] ANBBXQWFNXMHLD-UHFFFAOYSA-N 0.000 description 1
- 125000003368 amide group Chemical group 0.000 description 1
- 239000002956 ash Substances 0.000 description 1
- 239000012298 atmosphere Substances 0.000 description 1
- 235000007082 baiteng Nutrition 0.000 description 1
- 244000290660 baiteng Species 0.000 description 1
- 238000009412 basement excavation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011449 brick Substances 0.000 description 1
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 description 1
- PASHVRUKOFIRIK-UHFFFAOYSA-L calcium sulfate dihydrate Chemical compound O.O.[Ca+2].[O-]S([O-])(=O)=O PASHVRUKOFIRIK-UHFFFAOYSA-L 0.000 description 1
- 239000007795 chemical reaction product Substances 0.000 description 1
- 150000001844 chromium Chemical class 0.000 description 1
- 150000001845 chromium compounds Chemical class 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 239000004567 concrete Substances 0.000 description 1
- 239000007822 coupling agent Substances 0.000 description 1
- 238000004132 cross linking Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000007123 defense Effects 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 239000002270 dispersing agent Substances 0.000 description 1
- 238000010828 elution Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 229910001653 ettringite Inorganic materials 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 230000007062 hydrolysis Effects 0.000 description 1
- 238000006460 hydrolysis reaction Methods 0.000 description 1
- 239000002440 industrial waste Substances 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N iron oxide Inorganic materials [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 1
- 238000011068 loading method Methods 0.000 description 1
- 150000004668 long chain fatty acids Chemical class 0.000 description 1
- 230000001050 lubricating effect Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- ZODDGFAZWTZOSI-UHFFFAOYSA-N nitric acid;sulfuric acid Chemical compound O[N+]([O-])=O.OS(O)(=O)=O ZODDGFAZWTZOSI-UHFFFAOYSA-N 0.000 description 1
- 229920005646 polycarboxylate Polymers 0.000 description 1
- 238000006116 polymerization reaction Methods 0.000 description 1
- 229920001296 polysiloxane Polymers 0.000 description 1
- 230000001603 reducing effect Effects 0.000 description 1
- 239000005871 repellent Substances 0.000 description 1
- 230000002940 repellent Effects 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 229910052604 silicate mineral Inorganic materials 0.000 description 1
- RMAQACBXLXPBSY-UHFFFAOYSA-N silicic acid Chemical compound O[Si](O)(O)O RMAQACBXLXPBSY-UHFFFAOYSA-N 0.000 description 1
- 235000012239 silicon dioxide Nutrition 0.000 description 1
- 229910052814 silicon oxide Inorganic materials 0.000 description 1
- 229910001388 sodium aluminate Inorganic materials 0.000 description 1
- 239000000429 sodium aluminium silicate Substances 0.000 description 1
- 235000012217 sodium aluminium silicate Nutrition 0.000 description 1
- URGAHOPLAPQHLN-UHFFFAOYSA-N sodium aluminosilicate Chemical compound [Na+].[Al+3].[O-][Si]([O-])=O.[O-][Si]([O-])=O URGAHOPLAPQHLN-UHFFFAOYSA-N 0.000 description 1
- 239000011780 sodium chloride Substances 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 239000012798 spherical particle Substances 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 238000005979 thermal decomposition reaction Methods 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
- 231100000419 toxicity Toxicity 0.000 description 1
- 230000001988 toxicity Effects 0.000 description 1
- NVSDADJBGGUCLP-UHFFFAOYSA-N trisulfur Chemical compound S=S=S NVSDADJBGGUCLP-UHFFFAOYSA-N 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
Classifications
-
- 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
Abstract
The application relates to the field of building materials, and particularly discloses high-performance portland cement and a preparation method thereof. The high-performance portland cement comprises the following components in parts by weight: 30-40 parts of cement clinker, 8-16 parts of mixed material, 8-10 parts of gypsum, 10-20 parts of modified coal gangue, 0.2-0.4 part of water reducing agent, 0.03-0.05 part of waterproof agent and 0.05-0.1 part of grinding aid; the preparation method comprises the following steps: and drying the mixed material, adding cement clinker, gypsum, modified coal gangue and grinding aid, grinding, adding a water reducing agent and a waterproof agent, and homogenizing to obtain the high-performance portland cement. The high-performance portland cement has the advantages of high toughness, low brittleness, difficult cracking, recycling of coal gangue and high impermeability.
Description
Technical Field
The application relates to the technical field of building materials, in particular to high-performance portland cement and a preparation method thereof.
Background
The cement is an inorganic gel material which is added with water and stirred to form slurry, can be hardened in the air or water, can firmly bond sand, stone and other materials together, and is widely applied to the engineering of civil construction, water conservancy construction, national defense construction and the like.
Portland cement is mainly prepared by grinding cement clinker, mixed materials, a proper amount of gypsum and other components, and is easy to shrink after hardening and serious in early cracking due to high brittleness of cement.
The coal gangue is industrial waste left in the coal mine excavation and washing processes, not only occupies a large amount of land, but also can generate nature under proper conditions to pollute the atmosphere and underground water after being accumulated and gradually discarded for a long time.
Aiming at the related technologies, the inventor considers that the coal gangue is used for solving the problems of great brittleness, easy shrinkage and serious early cracking of portland cement in practical application to be solved urgently.
Disclosure of Invention
In order to improve the toughness of portland cement, reduce the shrinkage rate and early cracking performance of portland cement and recycle coal gangue, the application provides high-performance portland cement and a preparation method thereof.
In a first aspect, the present application provides a high-performance portland cement, which adopts the following technical scheme:
the high-performance portland cement comprises the following components in parts by weight: 30-40 parts of cement clinker, 8-16 parts of mixed material, 8-10 parts of gypsum, 10-20 parts of modified coal gangue, 0.2-0.4 part of water reducing agent, 0.03-0.05 part of waterproof agent and 0.05-0.1 part of grinding aid;
the preparation method of the modified coal gangue comprises the following steps:
(1) crushing and ball-milling the coal gangue, and mixing the crushed coal gangue with a silane coupling agent KH550 to obtain pretreated coal gangue, wherein the mass ratio of the coal gangue to the silane coupling agent KH550 is 0.2-0.4: 1;
(2) mixing, melting and extruding 10-15 parts by weight of pretreated coal gangue, 5-10 parts by weight of organic silicon modified alkyd resin, 3-5 parts by weight of parylene and 2-4 parts by weight of silicon oxynitride to prepare master batches;
(3) atomizing and depositing a pore-foaming agent on the surface of the master batch, and calcining for 3-5h at the temperature of 200-250 ℃ to prepare the porous master batch, wherein the mass ratio of the pore-foaming agent to the master batch is 0.04-0.1: 1;
(4) mixing 5-10 parts by weight of porous master batch, 1-3 parts by weight of hydroxyapatite and 0.6-1.2 parts by weight of carbon nano tube, stirring, spraying gelatin solution while stirring, and drying at the temperature of 105-.
By adopting the technical scheme, as the gypsum and the modified coal gangue are used for preparing the portland cement, the gypsum can play a role in adjusting the setting and early strengthening for the cement, the workability of cement mixtures is improved, the water consumption is reduced, the forming chance of the mono-sulfur hydrated calcium sulphoaluminate is reduced, the volume expansion caused by the conversion of the mono-sulfur sulphoaluminate to the tri-sulfur hydrated calcium sulphoaluminate is avoided, the dry shrinkage rate is reduced, and the hardening and cracking of the cement are prevented; when the coal gangue is modified, a silane coupling agent KH550 is used for pretreating the coal gangue, the silane coupling agent KH550 is used as an amphiphilic molecule and is firmly combined with the coal gangue to form organic groups which are subjected to covalent reaction with organic silicon modified alkyd resin and the like, the organic groups improve the compatibility of the coal gangue and organic modified alkyd resin and the dispersibility of the coal gangue, organic modified alkyd resin, poly-p-xylylene and silicon oxynitride, the bonding force of the coal gangue and the organic silicon modified alkyd resin is greatly improved, the organic modified alkyd resin has strong hydrophobicity and can increase the waterproof and anti-permeability effects of cement, and the organic silicon modified alkyd resin has strong adhesive force and high toughness, has good wear resistance, can be firmly combined with the coal gangue, and increases the tensile strength of the coal gangue; the method comprises the steps of coating organic silicon modified alkyd resin, parylene and silicon oxynitride on coal gangue to form master batches, spraying pore-forming agents on the master batches, decomposing the pore-forming agents after being heated to form pores on the surfaces of the master batches, and loading hydroxyapatite and carbon nanotubes in the pores and on the surfaces of the master batches by using gelatin solution, wherein the hydroxyapatite and the carbon nanotubes have high toughness and good tensile resistance, so that the tensile resistance of the modified coal gangue is further enhanced, the toughness of silicate cement is improved, and the silicate cement is prevented from cracking due to high brittleness.
Preferably, the mixed material comprises the following components in parts by weight: 3.4 to 5 weight parts of fly ash, 0.5 to 1 weight part of blast furnace slag micro powder and 1.6 to 3 weight parts of chromium slag.
By adopting the technical scheme, the chromium slag is the residue left after leaching of chromium compounds produced by chromite in chromium salt industry, hexavalent chromium contained in the chromium slag has the characteristics of strong mobility and easy diffusion, a large amount of hexavalent chromium migrates to soil and underground water after untreated piled chromium slag is soaked in rainwater, so that serious environmental pollution is caused, the chromium in the chromium slag is fixed by using blast furnace slag micro powder and fly ash, and the leaching concentration of total chromium and hexavalent chromium can be reduced to prepare the mixed material for cement, so that the aims of recycling the chromium slag and preventing the chromium slag from polluting the environment are fulfilled; the fly ash has the appearance characteristic of spherical particles, plays a role in lubricating cement with blast furnace slag, improves the fluidity of cement mixtures, reduces water demand, replaces part of cement clinker by adding the fly ash and the blast furnace slag, reduces the hydration heat of a cementing material, improves the dimensional stability of the cement, and plays a role in micro-aggregation and improves the compactness of the cement.
Preferably, the preparation method of the mixed material is as follows: mixing the chromium slag and the blast furnace slag micro powder, drying, carrying out ball milling, adding the fly ash and the alkali activator, continuing ball milling, and carrying out steam curing at 70-80 ℃ for 20-24h, wherein the dosage of the alkali activator is 20-30% of that of the fly ash.
By adopting the technical scheme, firstly, drying and ball milling are used, so that the chromium slag and blast furnace slag micro powder are subjected to severe impact under the mechanical action, the particle size is reduced, the internal structure is damaged, the crystal lattice is distorted, the crystallinity is reduced, the activity is improved, the alkali activator and the fly ash are added, the activity of the blast furnace slag micro powder and the fly ash is increased under the excitation of the alkali activator, the blast furnace slag micro powder and the fly ash are coated on the surface of the chromium slag as gel substances and react with calcium hydroxide in cement slurry quickly, the hydration process and the volcanic ash reaction are accelerated, and the strength of the mortar is stably increased.
Preferably, the alkali-activator is one or a combination of calcium hydroxide, calcium sulfate and calcium carbonate.
By adopting the technical scheme, the calcium hydroxide, the phosphogypsum and the calcium carbonate are used as alkaline excitants, so that the activity of the fly ash can be excited, the surface performance of fly ash particles is improved, and the compressive strength of cement is improved, thereby stabilizing and solidifying the chromium slag.
Preferably, the specific surface area of the mixed material is 400-450m2/kg。
By adopting the technical scheme, the fineness of the mixed material is finer than that of cement clinker, so that the mixed material can be fully filled among cement particles, the strength of the mixed material and cement is improved, the fluidity of a cement mixture is improved, and a water reducing effect is achieved.
Preferably, the preparation method of the cement clinker comprises the following steps: mixing 8-10 parts by weight of limestone and 2-4 parts by weight of iron tailings, ball-milling until 80um screen residue is 15-18%, calcining at 1300-; mixing 1-2 parts by weight of water glass and 0.15-0.2 part by weight of sodium polyacrylate, heating to 80-90 ℃, adding 2-3 parts by weight of sodium polyphosphate, preserving heat for 1.5-3 hours, cooling to room temperature, adding clinker, and uniformly mixing to obtain the cement clinker.
By adopting the technical scheme, hydration products of the cement clinker prepared by taking the iron tailings and the limestone as main raw materials are ettringite, calcium hydroxide and C-S-H, cement slurry is more and more compact along with continuous hydration of silicate minerals, the cement strength is higher, in addition, the iron tailings are industrial solid wastes, and the iron tailings can be effectively recycled and the comprehensive utilization rate of the iron tailings is improved when the iron tailings are used for preparing the cement clinker; the amide group in the sodium polyacrylate can generate a crosslinking effect with a silicon-oxygen bond in water glass, and the sodium polyacrylate is used as a dispersing agent, the sodium polyphosphate is promoted to be dissolved in the water glass, the sodium polyphosphate can accelerate the polymerization reaction of the sodium polyacrylate and the water glass, the sodium polyacrylate is promoted to be adsorbed on water glass colloidal particles, and the effect of preventing the mutual combination and growth of the water glass colloidal particles is achieved, so that the water glass is fine, the cohesive force is strong, the reaction capacity of limestone and modified water glass is strong, reaction products have higher cementing strength, and the compressive strength and the breaking strength of cement can be increased.
Preferably, the water reducing agent is one or a combination of a plurality of polycarboxylic acid water reducing agents and naphthalene water reducing agents;
the grinding aid is one or a composition of more of triethanolamine, sodium tripolyphosphate and sodium pyrophosphate.
By adopting the technical scheme, the polycarboxylic acid water reducing agent and the naphthalene water reducing agent can reduce the water consumption for mixing, improve the strength of the hardened cement, weaken the phenomenon of ball wrapping and grinding during cement grinding by the aid of the grinding aid, reduce the classical adsorption phenomenon in the grinding process, and improve the grinding efficiency.
Preferably, the porogen is one of PVA, ammonium bicarbonate and n-heptane.
By adopting the technical scheme, the thermal decomposition temperature of PVA, ammonium bicarbonate and n-heptane is low and is within 250 ℃, and pores can be formed on the surface of the master batch during calcination.
Preferably, the waterproof agent is prepared by mixing 3-hydroxyoctadecenoic acid, methyltriethoxysilane and absolute ethanol, wherein the mass ratio of the 3-hydroxyoctadecenoic acid to the methyltriethoxysilane to the absolute ethanol is 1:0.2-1: 10-20.
By adopting the technical scheme, the 3-hydroxyoctadecenoic acid belongs to long-chain fatty acid with hydrophobicity, and is complexed with methyltriethoxysilane through hydrolysis to form a waterproof agent, so that the waterproof and anti-permeability performance of the portland cement is improved.
In a second aspect, the present application provides a method for preparing high-performance portland cement, which adopts the following technical scheme:
a preparation method of high-performance portland cement comprises the following steps: and drying the mixed material, adding cement clinker, gypsum, modified coal gangue and grinding aid, grinding, adding a water reducing agent and a waterproof agent, and homogenizing to obtain the high-performance portland cement.
By adopting the technical scheme, the preparation method is simple and easy to operate.
In summary, the present application has the following beneficial effects:
1. because the modified coal gangue is adopted to prepare the silicate cement, the silane coupling agent KH550 increases the compatibility of the coal gangue with the organic silicon modified alkyd resin and the poly-p-xylene, so that the organic silicon modified alkyd resin, the poly-p-xylene and the silicon oxynitride are coated on the surface of the coal gangue to form master batches with good waterproofness and high toughness, and after pore-foaming agents are used to form pores on the master batches, hydroxyapatite and carbon nanotubes with high elastic modulus and strength and excellent hydrophobicity are filled in the pores, so that the toughness and impermeability of the modified coal gangue are further improved, and the problem of environmental pollution caused by stacking the coal gangue is solved.
2. The fly ash, the blast furnace slag micro powder and the chromium slag are preferably adopted to prepare the mixed material, and toxic hexavalent chromium is easily leached from the chromium slag, so that the fly ash and the blast furnace slag micro powder are excited by using the alkali excitant, the fly ash and the blast furnace slag micro powder with improved activity are coated on the surface of the chromium slag, the reaction with calcium hydroxide in cement is accelerated, and the stable increase of the strength of a mortar system is ensured.
3. In the application, the iron tailings, the limestone, the sodium polyacrylate and the sodium polyphosphate are preferably used for preparing the cement clinker, the iron tailings are industrial solid wastes and are prepared into the cement clinker, the iron tailings are recycled, the density of the prepared cement clinker is increased, and in addition, the iron tailings, the limestone, the sodium polyacrylate and the sodium polyphosphate are mixed to increase the bonding strength of the cement clinker, so that the breaking strength of the silicate cement is improved, and the silicate cement is not easy to crack.
Detailed Description
Preparation examples 1 to 3 of modified coal gangue
The silane coupling agent KH550 is selected from Zhengzhou Longxin chemical product company Limited, the organic silicon modified alkyd resin is selected from Anhuiming Yisilseojiu company Limited and is of the model MY330C, the parylene is selected from Baiteng technology company Limited and is of the model PTP-5V, the silicon oxynitride is selected from PVA from Guangzhou city deep creative chemical product company Limited and is of the model BP-24, the hydroxyapatite is selected from West Anzeng Pont biological technology company Limited and is of the model ZB6556, and the carbon nano tube is selected from Zibogyxing technology company Limited and is of the model 001.
Preparation example 1: the preparation method of the modified coal gangue comprises the following steps:
(1) crushing and ball-milling the coal gangue for 30min, and mixing the coal gangue with a silane coupling agent KH550 to obtain pretreated coal gangue, wherein the mass ratio of the coal gangue to the silane coupling agent KH550 is 0.2:1, and the chemical components of the coal gangue are shown in Table 1;
(2) mixing 10kg of pretreated coal gangue with 5kg of organic silicon modified alkyd resin, 3kg of parylene and 2kg of silicon oxynitride, melting at 350 ℃, and extruding to obtain master batches with the particle size of 30um, wherein the solid content of the organic silicon modified alkyd resin is 50%;
(3) atomizing and depositing a pore-foaming agent on the surface of the master batch, and calcining for 5 hours at 200 ℃ to prepare porous master batch, wherein the mass ratio of the pore-foaming agent to the master batch is 0.04: 1, and the pore-foaming agent is PVA;
(4) 5kg of porous master batch, 1kg of hydroxyapatite and 0.6kg of carbon nano tube are mixed and stirred, gelatin solution is sprayed while stirring, and the mixture is dried at 105 ℃ to prepare the modified coal gangue, wherein the mass ratio of the gelatin solution to the porous master batch is 0.03: 1.
TABLE 1 chemical composition of coal gangue
| Fraction/% of | SiO2 | Al2O3 | Fe2O3 | CaO | MgO |
| Coal gangue | 63.07 | 22.80 | 6.51 | 4.32 | 0.61 |
Preparation example 2: (1) crushing and ball-milling the coal gangue for 40min, and mixing the coal gangue with a silane coupling agent KH550 to prepare pretreated coal gangue, wherein the mass ratio of the coal gangue to the silane coupling agent KH550 is 0.3: 1, and the chemical components of the coal gangue are shown in Table 1;
(2) mixing 13kg of pretreated coal gangue with 8kg of organic silicon modified alkyd resin, 4kg of parylene and 3kg of silicon oxynitride, melting at 400 ℃, and extruding to prepare master batches with the particle size of 35um, wherein the solid content of the organic silicon modified alkyd resin is 51%;
(3) atomizing and depositing a pore-foaming agent on the surface of the master batch, and calcining at 230 ℃ for 4 hours to prepare a porous master batch, wherein the mass ratio of the pore-foaming agent to the master batch is 0.07: 1, and the pore-foaming agent is ammonium bicarbonate;
(4) mixing 8kg of porous master batch, 2kg of hydroxyapatite and 0.9kg of carbon nano tube, stirring, spraying gelatin solution while stirring, and drying at 110 ℃ to obtain the modified coal gangue, wherein the mass ratio of the gelatin solution to the porous master batch is 0.04: 1.
Preparation example 3: (1) crushing and ball-milling the coal gangue for 50min, and mixing the coal gangue with a silane coupling agent KH550 to obtain pretreated coal gangue, wherein the mass ratio of the coal gangue to the silane coupling agent KH550 is 0.4:1, and the chemical components of the coal gangue are shown in Table 1;
(2) mixing 15kg of pretreated coal gangue with 10kg of organic silicon modified alkyd resin, 5kg of parylene and 4kg of silicon oxynitride, melting at 450 ℃, and extruding to obtain master batches with the particle size of 40um, wherein the solid content of the organic silicon modified alkyd resin is 52%;
(3) atomizing and depositing a pore-foaming agent on the surface of the master batch, and calcining for 3 hours at 250 ℃ to prepare porous master batch, wherein the mass ratio of the pore-foaming agent to the master batch is 0.1:1, and the pore-foaming agent is n-heptane;
(4) mixing 10kg of porous master batch, 3kg of hydroxyapatite and 1.2kg of carbon nano tube, stirring, spraying gelatin solution while stirring, and drying at 110 ℃ to obtain the modified coal gangue, wherein the mass ratio of the gelatin solution to the porous master batch is 0.05: 1.
Examples
In the following examples, the blast furnace slag micro powder is selected from Qiangdong products processing factory in Lingshou county, the model is qd094, the polycarboxylate water reducer is selected from Rongtai chemical products Co., Ltd, the model is S-1217, the naphthalene water reducer is selected from Jinnan Weizheng chemical products Co., Ltd, the model is 015, the waterproof agent is selected from Shandong Jingfeng new building materials Co., Ltd, the product is 1001, the cement clinker is selected from rock row mineral processing factory in Lingzhou county, the product is 25, the triethanolamine is selected from Hongtong chemical technology Co., Ltd, the model is TEA, the sodium tripolyphosphate is selected from Purpurified light Co., Ltd, the product is 0122, and the sodium pyrophosphate is selected from Caoguan Guansu actual GS Co., Ltd, and the model is-31.
Example 1: the raw material dosage of the high-performance portland cement is shown in table 2, and the preparation method of the high-performance portland cement comprises the following steps:
drying 8kg of mixed material until the water content is 3%, adding 30kg of cement clinker, 8kg of gypsum, 10kg of modified coal gangue and 0.05kg of grinding aid, grinding for 30min, adding 0.2kg of water reducing agent and 0.03kg of waterproof agent, and homogenizing to obtain the high-performance portland cement, wherein the mixed material is prepared by mixing 3.4kg of fly ash and 0.5kg of blast furnace slag micro powder, the fly ash is grade III fly ash, the cement clinker is selected from commercial products, the content of calcium oxide in the gypsum is 38%, the content of silicon oxide is 2.8%, the modified coal gangue is selected from preparation example 1 of the modified coal gangue, the water reducing agent is a polycarboxylic acid water reducing agent, the grinding aid is triethanolamine, and the waterproof agent is selected from commercial products.
TABLE 2 raw material amounts of high-performance portland cements in examples 1-5
Example 2: the high-performance portland cement is different from the portland cement in example 1 in that the raw materials are used in the amount shown in table 2, the water reducing agent is a naphthalene water reducing agent, and the grinding aid is triethanolamine and sodium pyrophosphate in a mass ratio of 1: 1.
Example 3: the high-performance portland cement is different from the portland cement in example 1 in that the raw materials are used in the amount shown in table 2, the water reducing agents are a polycarboxylic acid water reducing agent and a naphthalene water reducing agent in a mass ratio of 1:1, and the grinding aid is sodium tripolyphosphate.
Examples 4 to 5: a high-performance portland cement is different from the portland cement of example 1 in the use amount of the raw materials shown in Table 2.
Example 6: a high-performance portland cement is different from example 1 in that the modified coal gangue is prepared from preparation example 2 of the modified coal gangue.
Example 7: a high-performance portland cement is different from example 1 in that the modified coal gangue is prepared from preparation example 3 of the modified coal gangue.
Example 8: a high performance portland cement, differing from example 1 in that the mixed material was made by the following method: mixing 1.6kg of chromium slag and 0.5kg of blast furnace slag micro powder, drying at 80 ℃ for 30min, ball-milling for 40min, adding 3.4kg of fly ash and 0.68kg of alkali activator, and continuing ball-milling until the specific surface area of the mixed material is 400m2And/kg, then placing at 80 ℃ for steaming for 20h, wherein the alkali activator is calcium hydroxide, and the fly ash is grade III fly ash.
Example 9: a high performance portland cement, differing from example 1 in that the mixed material was made by the following method: mixing 2.3kg of chromium slag and 0.8kg of blast furnace slag micro powder, drying at 70 ℃ for 40min, carrying out ball milling for 50min, adding 4.2kg of fly ash and 1.05kg of alkali activator, and continuing ball milling until the specific surface area of the mixed material is 430m2And/kg, then placing at 75 ℃ for steam curing for 22h, wherein the alkali activator is calcium sulfate, and the fly ash is grade III fly ash.
Example 10: a high performance portland cement, differing from example 1 in that the mixed material was made by the following method: mixing 3kg of chromium slag and 1kg of blast furnace slag micro powder, drying at 80 ℃ for 40min, performing ball milling for 60min, adding 5kg of fly ash and 1.5kg of alkali activator, and continuing ball milling until the specific surface area of the mixed material is 450m2/kg, then placed at 70Steaming at the temperature of 24 hours, wherein the alkali activator is calcium carbonate, and the fly ash is grade III fly ash.
Example 11: a high-performance portland cement is different from that in example 8 in that no alkali activator is added.
Example 12: a high-performance portland cement is different from the portland cement clinker prepared in the following steps: mixing 8kg of limestone and 2kg of iron tailings, ball-milling until 80um of screen residue is 15%, calcining for 60min at 1300 ℃, and cooling to obtain clinker; mixing 1kg of water glass and 0.15kg of sodium polyacrylate, heating to 80 ℃, adding 2kg of sodium polyphosphate, preserving heat for 1.5h, cooling to room temperature, adding clinker, and uniformly mixing to obtain the cement clinker, the limestone and the iron tailings, wherein the chemical components are shown in Table 3.
TABLE 3 main chemical composition of limestone and iron ore
| w/％ | CaO | Al2O3 | SiO2 | Fe2O3 | MgO | SO3 | Loss on ignition |
| Limestone | 50.32 | 2.83 | 10.22 | 2.36 | 1.35 | 0.12 | 32.76 |
| Iron tailings | 12.41 | 19.07 | 45.41 | 10.86 | 7.23 | 0.44 | 1.22 |
Example 13: a high-performance portland cement is different from the portland cement clinker prepared in the following steps: mixing 9kg of limestone and 3kg of iron tailings, ball-milling until 80um of screen residue is 16%, calcining for 50min at 1350 ℃, and cooling to obtain clinker; 1.5kg of water glass and 0.18kg of sodium polyacrylate are mixed, heated to 85 ℃, added with 2.5kg of sodium polyphosphate, kept warm for 2h, cooled to room temperature, added with clinker, and mixed uniformly to prepare the cement clinker, the chemical components of limestone and iron tailings as shown in Table 3.
Example 14: a high-performance portland cement is different from the portland cement clinker prepared in the following steps: mixing 10kg of limestone and 4kg of iron tailings, ball-milling until 80um of screen residue is 18 percent, calcining for 30min at 1400 ℃, and cooling to prepare clinker; mixing 2kg of water glass and 0.2kg of sodium polyacrylate, heating to 90 ℃, adding 3kg of sodium polyphosphate, preserving heat for 2h, cooling to room temperature, adding clinker, and uniformly mixing to obtain the cement clinker, limestone and iron tailings with the chemical components shown in Table 3.
Example 15: a high-performance portland cement, which is different from example 12 in that cement clinker is prepared by mixing 9kg of limestone and 3kg of iron tailings, ball-milling until 80um screen residue is 16%, calcining at 1350 ℃ for 50min, and cooling.
Example 16: a high-performance portland cement is different from the portland cement prepared in example 12 in that no sodium polyacrylate is added.
Example 17: a high-performance portland cement differs from example 12 in that no sodium polyphosphate is added.
Example 18: a high-performance portland cement is different from the portland cement in example 1 in that a waterproof agent is prepared by mixing 3-hydroxyoctadecenoic acid, methyltriethoxysilane and absolute ethanol in a mass ratio of 1:0.2: 10.
Example 19: a high-performance portland cement is different from the portland cement in example 1 in that a waterproof agent is prepared by mixing 3-hydroxyoctadecenoic acid, methyltriethoxysilane and absolute ethanol in a mass ratio of 1:0.5: 15.
Example 20: a high-performance portland cement is different from the portland cement in example 1 in that a waterproof agent is prepared by mixing 3-hydroxyoctadecenoic acid, methyltriethoxysilane and absolute ethanol in a mass ratio of 1:1: 20.
Example 21: a high performance portland cement differing from example 18 in that the mixed material was prepared by the following method: mixing 1.6kg of chromium slag and 0.5kg of blast furnace slag micro powder, drying at 80 ℃ for 30min, ball-milling for 40min, adding 3.4kg of fly ash and 0.68kg of alkali activator, and continuing ball-milling until the specific surface area of the mixed material is 400m2Per kg, then placing at 80 ℃ for steaming for 20h, wherein the alkali activator is calcium hydroxide; the preparation method of the cement clinker comprises the following steps: mixing 8kg of limestone and 2kg of iron tailings, ball-milling until 80um of screen residue is 15%, calcining for 60min at 1300 ℃, and cooling to obtain clinker; mixing 1kg of water glass and 0.15kg of sodium polyacrylate, heating to 80 ℃, adding 2kg of sodium polyphosphate, preserving heat for 1.5h, cooling to room temperature, adding clinker, and uniformly mixing to obtain the cement clinker, the limestone and the iron tailings, wherein the chemical components are shown in Table 3.
Comparative example
Comparative example 1: a high-performance portland cement, which is different from example 1 in that unmodified coal gangue is used instead of modified coal gangue.
Comparative example 2: a high-performance portland cement is different from the portland cement in example 1 in that no silane coupling agent KH550 is used for pretreating coal gangue in step (1).
Comparative example 3: a high performance portland cement differing from example 1 in that no silicone modified alkyd resin was added in step (2).
Comparative example 4: a high-performance portland cement is different from the portland cement in example 1 in that no parylene is added in step (2).
Comparative example 5: a high-performance portland cement is different from the portland cement in example 1 in that no silicon oxynitride is added in step (2).
Comparative example 6: a high-performance portland cement is different from example 1 in that step (3) is not performed.
Comparative example 7: a high-performance portland cement is different from the portland cement in example 1 in that hydroxyapatite is not added in the step (4).
Comparative example 8: a high-performance portland cement is different from the portland cement in example 1 in that no carbon nanotubes are added in step (4).
Comparative example 9: a preparation method of composite portland cement comprises the following steps: (1) crushing 70 parts by weight of portland cement clinker and 6 parts by weight of dihydrate gypsum to a particle size of 5-6 mm; (2) crushing 7 parts by weight of steel slag, and then placing the crushed steel slag in a ball mill for grinding to obtain fine steel slag powder with the granularity of 18-20 mu m; (3) placing 15 parts by weight of fly ash into an ultrafine grinding machine for grinding to obtain the fly ash with the specific surface area of 900-1000m2/kg of ultrafine fly ash; (4) grinding and mixing the crushed Portland cement clinker, dihydrate gypsum, ground steel slag powder, ultrafine fly ash, 1.5 parts by weight of exciting agent and 0.5 part by weight of grinding aid for 3 hours to obtain the cement with the specific surface area of 600-700m2Per kg of composite portland cement; the silicate cement clinker comprises 65 weight portions of CaO and 20 weight portions of SiO25 parts by weight of Al2O35 parts by weight of Fe2O3And 5 parts by weight of MgO; what is needed isThe steel slag contains 55 weight portions of CaO and 17 weight portions of SiO24 parts by weight of Al2O36 parts by weight of Fe2O38 parts by weight of FeO, 5 parts by weight of MgO, 3 parts by weight of MnO and 2 parts by weight of P2O5(ii) a The excitant is a mixture of sodium aluminate and sodium aluminosilicate; the chemical components of the grinding aid include triethanolamine, ethylene glycol, sodium chloride and aluminum sulfate.
Performance test
Firstly, the mixed material is prepared according to the method in the embodiment 8-10, the elution amount of hexavalent chromium and total chromium in the chromium slag is detected by a sulfuric acid-nitric acid method and a TCLP toxicity leaching method, and the detection result is recorded in the table 4.
Table 4 concentration of chromium in the mixed materials prepared in examples 8 to 10.
As can be seen from the data in Table 4, when the fly ash, the blast furnace slag micro powder and the alkali activator are used for treating the chromium slag, the leaching solubility of total chromium and hexavalent chromium in the chromium slag in the prepared mixed material is low, and the mixed material meets the standard (total chromium concentration is less than 0.3mg/L and hexavalent chromium concentration is less than 0.1mg/L) of producing bricks or building blocks by using the chromium slag in technical Specification for environmental protection for chromium slag pollution treatment (provisional) (HJ/T301-2007), so that the mixed material can be used for preparing cement without causing pollution.
Second, high-performance portland cement was prepared according to the methods in examples and comparative examples, the properties of the portland cement were measured by the following methods, and the measurement results are reported in table 5.
1. Compressive strength: detecting according to GB/T17671-1999 method for testing cement mortar strength (ISO) method;
2. breaking strength: detecting according to GB/T17671-1999 method for testing cement mortar strength (ISO) method;
3. 28d dry shrinkage: detecting according to JC/T603-2004 'Cement mortar drying shrinkage test method';
4. heat of hydration: detecting according to GB/T12959-2008 'Standard of Cement hydration Heat determination method';
5. and (3) seepage pressure resistance: detection is carried out according to GB18445-2001 cement-based permeable crystalline waterproof material.
TABLE 5 Performance test results for high Performance Portland Cement
By combining the data in examples 1-7 and table 5, it can be seen that the modified coal gangue prepared by the method in examples 1-7 replaces part of portland cement clinker, and the prepared high-performance portland cement has high compressive strength, high flexural strength, small hydration heat and low shrinkage, improves the toughness of the cement, reduces brittleness, and makes the cement not easy to crack when hardened.
In examples 8 to 10, the mixture prepared in the present application was added to high performance portland cement on the basis of the addition of the modified coal gangue prepared in the present application, because the mixed material in examples 1 to 6 was prepared by mixing fine blast furnace slag powder and fly ash, and the mixed material in examples 8 to 10 was prepared by mixing fine blast furnace slag powder, fly ash, chromium slag, and alkali activator, the cement prepared in examples 8 to 10 had a reduced heat of hydration and a reduced dry shrinkage.
In example 11, compared with example 8, the activity of fly ash and chromium slag is not excited without adding the alkali activator, the hydration heat of the high-performance portland cement is increased, the shrinkage rate is increased, and the compressive strength is reduced, which shows that the alkali activator can effectively reduce the hydration heat of the cement, reduce the shrinkage rate and improve the compressive strength.
In examples 12 to 14, the cement clinker prepared in the present application was added to high-performance portland cement in addition to the modified coal gangue prepared in the present application, and the results in table 5 show that the flexural strength of the portland cement prepared in examples 12 to 14 was significantly increased and the shrinkage rate was decreased, which indicates that the cement clinker prepared in the present application can significantly improve the toughness of the portland cement and decrease the shrinkage rate.
The cement clinker in example 15 is prepared by calcining iron tailings and limestone, sodium polyacrylate is not added when the cement clinker is prepared in example 16, sodium polyphosphate is not added when the cement clinker is prepared in example 17, and as can be seen from the data in table 5, the high-performance portland cements prepared in examples 15-17 have obviously reduced flexural strength and increased shrinkage when compared with example 12, which shows that the cement clinker prepared by the method can obviously increase the toughness of the portland cement, reduce the shrinkage and prevent cracking during hardening.
Examples 18-20 the water repellent prepared in accordance with the present application was used in addition to example 1, and it can be seen from the data in Table 5 that the 28-day barrier properties of the portland cements prepared in examples 18-20 were significantly increased in comparison with example 1, and the barrier properties were improved.
In example 21, compared with example 18, the cement clinker and the mixed material prepared by the present application are added, and as can be seen from table 5, the high-performance portland cement prepared in example 21 has high flexural strength and high impermeability, and is the best example.
Compared with the example 1, the Portland cement prepared in the comparative example 1 has the advantages that the compressive strength and the breaking strength are reduced, the shrinkage rate and the hydration heat are increased, the toughness is poorer and the Portland cement is easy to crack, and the modified coal gangue prepared in the application can effectively increase the toughness of the Portland cement and increase the crack resistance of the Portland cement.
The coal gangue is not pretreated by the silicic acid coupling agent KH550 in the comparative example 2, and the data in Table 5 show that the flexural strength of the portland cement prepared in the comparative example 2 is reduced, the dry shrinkage rate is increased, which shows that the silane coupling agent KH550 can increase the compatibility of the organosilicon modified alkyd resin and the parylene with the coal gangue, thereby improving the toughness of the portland cement.
The silicate cement prepared by the comparative example 3 and the comparative example 4 has obviously lower breaking strength than that of the silicate cement prepared by the example 1, and the silicate cement can effectively improve the toughness and prevent the silicate cement from cracking during hardening by using the organic silicon modified alkyd resin, the parylene and the pretreated coal gangue for blending and extruding.
In comparative example 5, silicon oxynitride and pretreated coal gangue are not used for melt extrusion, and the compressive strength of the portland cement prepared in comparative example 5 is reduced compared with that of example 1, the flexural strength is not changed greatly, which shows that the silicon oxynitride can increase the compressive strength of concrete.
In comparative example 6, the master batch is used for pore forming, and the data in Table 5 shows that the compression strength of the portland cement prepared in comparative example 6 is increased and the flexural strength is reduced compared with example 1, which indicates that the toughness of the portland cement can be increased and the portland cement can be prevented from hardening and cracking by virtue of pore forming of the master batch.
The Portland cement prepared in the comparative example 7 and the Portland cement prepared in the comparative example 8 have reduced toughness and increased shrinkage rate as shown by the data in Table 5, and the hydroxyapatite and the carbon nanotubes can increase the toughness of the Portland cement and prevent the Portland cement from hardening and cracking.
Comparative example 9 is a composite portland cement prepared by the prior art, which has a large compressive strength, but a small flexural strength and a poor impermeability, compared to the present application.
The present embodiment is only for explaining the present application, and it is not limited to the present application, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present application.
Claims (10)
1. The high-performance portland cement is characterized by comprising the following components in parts by weight: 30-40 parts of cement clinker, 8-16 parts of mixed material, 8-10 parts of gypsum, 10-20 parts of modified coal gangue, 0.2-0.4 part of water reducing agent, 0.03-0.05 part of waterproof agent and 0.05-0.1 part of grinding aid;
the preparation method of the modified coal gangue comprises the following steps:
(1) crushing and ball-milling the coal gangue, and mixing the crushed coal gangue with a silane coupling agent KH550 to obtain pretreated coal gangue, wherein the mass ratio of the coal gangue to the silane coupling agent KH550 is 0.2-0.4: 1;
(2) mixing, melting and extruding 10-15 parts by weight of pretreated coal gangue, 5-10 parts by weight of organic silicon modified alkyd resin, 3-5 parts by weight of parylene and 2-4 parts by weight of silicon oxynitride to prepare master batches;
(3) atomizing and depositing a pore-foaming agent on the surface of the master batch, and calcining for 3-5h at the temperature of 200-250 ℃ to prepare the porous master batch, wherein the mass ratio of the pore-foaming agent to the master batch is 0.04-0.1: 1;
(4) mixing 5-10 parts by weight of porous master batch, 1-3 parts by weight of hydroxyapatite and 0.6-1.2 parts by weight of carbon nano tube, stirring, spraying gelatin solution while stirring, and drying at the temperature of 105-.
2. The high performance portland cement of claim 1, wherein: the mixed material comprises the following components in parts by weight: 3.4 to 5 weight parts of fly ash, 0.5 to 1 weight part of blast furnace slag micro powder and 1.6 to 3 weight parts of chromium slag.
3. The high performance portland cement of claim 2, wherein: the preparation method of the mixed material comprises the following steps: mixing the chromium slag and the blast furnace slag micro powder, drying, carrying out ball milling, adding the fly ash and the alkali activator, continuing ball milling, and carrying out steam curing at 70-80 ℃ for 20-24h, wherein the dosage of the alkali activator is 20-30% of that of the fly ash.
4. The high-performance portland cement of claim 3, wherein the alkali-activator is one or more of calcium hydroxide, calcium sulfate, and calcium carbonate.
5. The high-performance portland cement of claim 1, wherein the specific surface area of the mixed material is 400-450m2/kg。
6. The high-performance portland cement of claim 1, wherein the cement clinker is prepared by the following steps: mixing 8-10 parts by weight of limestone and 2-4 parts by weight of iron tailings, ball-milling until 80um screen residue is 15-18%, calcining at 1300-; mixing 1-2 parts by weight of water glass and 0.15-0.2 part by weight of sodium polyacrylate, heating to 80-90 ℃, adding 2-3 parts by weight of sodium polyphosphate, preserving heat for 1.5-3 hours, cooling to room temperature, adding clinker, and uniformly mixing to obtain the cement clinker.
7. The high-performance portland cement of claim 1, wherein the water reducer is one or a combination of polycarboxylic acid water reducer and naphthalene water reducer;
the grinding aid is one or a composition of more of triethanolamine, sodium tripolyphosphate and sodium pyrophosphate.
8. The high performance portland cement of claim 1, wherein the porogen is one of PVA, ammonium bicarbonate, and n-heptane.
9. The high-performance portland cement of claim 1, wherein the waterproof agent is prepared by mixing 3-hydroxyoctadecenoic acid, methyltriethoxysilane and absolute ethanol, and the mass ratio of the 3-hydroxyoctadecenoic acid, the methyltriethoxysilane and the absolute ethanol is 1:0.2-1: 10-20.
10. A method of producing a high performance portland cement according to any one of claims 1-9, comprising the steps of:
and drying the mixed material, adding cement clinker, gypsum, modified coal gangue and grinding aid, grinding, adding a water reducing agent and a waterproof agent, and homogenizing to obtain the high-performance portland cement.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114671637A (en) * | 2022-02-28 | 2022-06-28 | 中国矿业大学 | Preparation method of high-performance concrete containing coal gangue |
| CN115010387A (en) * | 2022-06-02 | 2022-09-06 | 马鞍山石溪野水泥有限责任公司 | High-performance cement and preparation method thereof |
| CN115196893A (en) * | 2022-08-03 | 2022-10-18 | 平邑中联水泥有限公司 | Corrosion-resistant marine cement and preparation method thereof |
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2021
- 2021-01-28 CN CN202110115130.XA patent/CN112679117A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114671637A (en) * | 2022-02-28 | 2022-06-28 | 中国矿业大学 | Preparation method of high-performance concrete containing coal gangue |
| CN115010387A (en) * | 2022-06-02 | 2022-09-06 | 马鞍山石溪野水泥有限责任公司 | High-performance cement and preparation method thereof |
| CN115196893A (en) * | 2022-08-03 | 2022-10-18 | 平邑中联水泥有限公司 | Corrosion-resistant marine cement and preparation method thereof |
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