CN116002998A - Method for preparing composite mineral admixture from water quenched converter slag - Google Patents
Method for preparing composite mineral admixture from water quenched converter slag Download PDFInfo
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- CN116002998A CN116002998A CN202310021197.6A CN202310021197A CN116002998A CN 116002998 A CN116002998 A CN 116002998A CN 202310021197 A CN202310021197 A CN 202310021197A CN 116002998 A CN116002998 A CN 116002998A
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- slag
- water
- converter slag
- quenched
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- 239000002893 slag Substances 0.000 title claims abstract description 264
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 122
- 229910052500 inorganic mineral Inorganic materials 0.000 title claims abstract description 66
- 239000011707 mineral Substances 0.000 title claims abstract description 66
- 239000002131 composite material Substances 0.000 title claims abstract description 53
- 238000000034 method Methods 0.000 title claims abstract description 38
- 238000000227 grinding Methods 0.000 claims abstract description 72
- 235000010755 mineral Nutrition 0.000 claims abstract description 65
- 239000004568 cement Substances 0.000 claims abstract description 59
- 239000010440 gypsum Substances 0.000 claims abstract description 46
- 229910052602 gypsum Inorganic materials 0.000 claims abstract description 46
- 239000000654 additive Substances 0.000 claims abstract description 36
- 229910021487 silica fume Inorganic materials 0.000 claims abstract description 36
- 230000000996 additive effect Effects 0.000 claims abstract description 29
- 229960004887 ferric hydroxide Drugs 0.000 claims abstract description 28
- IEECXTSVVFWGSE-UHFFFAOYSA-M iron(3+);oxygen(2-);hydroxide Chemical compound [OH-].[O-2].[Fe+3] IEECXTSVVFWGSE-UHFFFAOYSA-M 0.000 claims abstract description 28
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims abstract description 21
- 238000002156 mixing Methods 0.000 claims abstract description 21
- CSNNHWWHGAXBCP-UHFFFAOYSA-L Magnesium sulfate Chemical compound [Mg+2].[O-][S+2]([O-])([O-])[O-] CSNNHWWHGAXBCP-UHFFFAOYSA-L 0.000 claims abstract description 20
- 239000010881 fly ash Substances 0.000 claims abstract description 19
- 239000000126 substance Substances 0.000 claims abstract description 17
- 235000019738 Limestone Nutrition 0.000 claims abstract description 15
- 229910000914 Mn alloy Inorganic materials 0.000 claims abstract description 15
- 239000006028 limestone Substances 0.000 claims abstract description 15
- 238000005065 mining Methods 0.000 claims abstract description 15
- FNAQSUUGMSOBHW-UHFFFAOYSA-H calcium citrate Chemical compound [Ca+2].[Ca+2].[Ca+2].[O-]C(=O)CC(O)(CC([O-])=O)C([O-])=O.[O-]C(=O)CC(O)(CC([O-])=O)C([O-])=O FNAQSUUGMSOBHW-UHFFFAOYSA-H 0.000 claims abstract description 13
- 239000001354 calcium citrate Substances 0.000 claims abstract description 13
- 235000013337 tricalcium citrate Nutrition 0.000 claims abstract description 13
- 229910052943 magnesium sulfate Inorganic materials 0.000 claims abstract description 10
- 235000019341 magnesium sulphate Nutrition 0.000 claims abstract description 10
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 claims description 93
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 82
- 239000000243 solution Substances 0.000 claims description 79
- 239000000706 filtrate Substances 0.000 claims description 66
- 238000001914 filtration Methods 0.000 claims description 54
- 238000003756 stirring Methods 0.000 claims description 54
- TWRXJAOTZQYOKJ-UHFFFAOYSA-L Magnesium chloride Chemical compound [Mg+2].[Cl-].[Cl-] TWRXJAOTZQYOKJ-UHFFFAOYSA-L 0.000 claims description 50
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims description 48
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 claims description 45
- 239000011259 mixed solution Substances 0.000 claims description 42
- 229910052742 iron Inorganic materials 0.000 claims description 40
- 239000002244 precipitate Substances 0.000 claims description 35
- 239000000843 powder Substances 0.000 claims description 33
- 239000007788 liquid Substances 0.000 claims description 28
- 229910001629 magnesium chloride Inorganic materials 0.000 claims description 25
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 24
- 238000010791 quenching Methods 0.000 claims description 24
- 230000000171 quenching effect Effects 0.000 claims description 24
- 229910000029 sodium carbonate Inorganic materials 0.000 claims description 24
- 238000001035 drying Methods 0.000 claims description 21
- 238000010438 heat treatment Methods 0.000 claims description 21
- 239000000395 magnesium oxide Substances 0.000 claims description 21
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims description 21
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 claims description 21
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 claims description 19
- 238000006243 chemical reaction Methods 0.000 claims description 16
- 239000000463 material Substances 0.000 claims description 15
- 150000001875 compounds Chemical class 0.000 claims description 14
- 238000004062 sedimentation Methods 0.000 claims description 14
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 claims description 13
- 230000008569 process Effects 0.000 claims description 12
- 229910052938 sodium sulfate Inorganic materials 0.000 claims description 12
- 235000011152 sodium sulphate Nutrition 0.000 claims description 12
- 239000007790 solid phase Substances 0.000 claims description 12
- 239000011574 phosphorus Substances 0.000 claims description 11
- 229910052698 phosphorus Inorganic materials 0.000 claims description 11
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 9
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 9
- ZMANZCXQSJIPKH-UHFFFAOYSA-N Triethylamine Chemical compound CCN(CC)CC ZMANZCXQSJIPKH-UHFFFAOYSA-N 0.000 claims description 9
- 239000003546 flue gas Substances 0.000 claims description 9
- 239000011521 glass Substances 0.000 claims description 9
- 239000010439 graphite Substances 0.000 claims description 9
- 229910002804 graphite Inorganic materials 0.000 claims description 9
- -1 gypsum Chemical compound 0.000 claims description 9
- 238000006460 hydrolysis reaction Methods 0.000 claims description 9
- 230000003301 hydrolyzing effect Effects 0.000 claims description 9
- 239000013081 microcrystal Substances 0.000 claims description 9
- 239000000203 mixture Substances 0.000 claims description 8
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 claims description 6
- 239000000047 product Substances 0.000 claims description 6
- 239000002994 raw material Substances 0.000 claims description 6
- 238000005507 spraying Methods 0.000 claims description 6
- 239000013049 sediment Substances 0.000 claims description 5
- 229910004298 SiO 2 Inorganic materials 0.000 claims description 4
- 239000000292 calcium oxide Substances 0.000 claims description 4
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims description 4
- 238000006477 desulfuration reaction Methods 0.000 claims description 4
- 230000023556 desulfurization Effects 0.000 claims description 4
- 229910000323 aluminium silicate Inorganic materials 0.000 claims description 3
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 claims description 3
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 claims description 3
- 239000003673 groundwater Substances 0.000 claims description 3
- 239000011780 sodium chloride Substances 0.000 claims description 3
- 239000007787 solid Substances 0.000 claims description 3
- 239000002910 solid waste Substances 0.000 claims description 3
- 239000006228 supernatant Substances 0.000 claims description 3
- 229940086542 triethylamine Drugs 0.000 claims description 3
- BHPQYMZQTOCNFJ-UHFFFAOYSA-N Calcium cation Chemical compound [Ca+2] BHPQYMZQTOCNFJ-UHFFFAOYSA-N 0.000 claims description 2
- 238000001816 cooling Methods 0.000 claims description 2
- 239000003814 drug Substances 0.000 claims 1
- 239000004567 concrete Substances 0.000 abstract description 36
- 230000000694 effects Effects 0.000 abstract description 22
- 230000005284 excitation Effects 0.000 abstract description 13
- 238000007710 freezing Methods 0.000 abstract description 6
- 230000008014 freezing Effects 0.000 abstract description 6
- 238000003912 environmental pollution Methods 0.000 abstract description 3
- 238000012360 testing method Methods 0.000 description 60
- 238000010257 thawing Methods 0.000 description 9
- 230000006378 damage Effects 0.000 description 6
- 230000000887 hydrating effect Effects 0.000 description 6
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 5
- 239000002245 particle Substances 0.000 description 5
- 238000006467 substitution reaction Methods 0.000 description 5
- 239000011575 calcium Substances 0.000 description 4
- 238000007676 flexural strength test Methods 0.000 description 4
- 238000011068 loading method Methods 0.000 description 4
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 3
- 230000000704 physical effect Effects 0.000 description 3
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 2
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 229910052791 calcium Inorganic materials 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 230000009977 dual effect Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000003334 potential effect Effects 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 230000035484 reaction time Effects 0.000 description 2
- 230000009257 reactivity Effects 0.000 description 2
- 238000001179 sorption measurement Methods 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- AEQDJSLRWYMAQI-UHFFFAOYSA-N 2,3,9,10-tetramethoxy-6,8,13,13a-tetrahydro-5H-isoquinolino[2,1-b]isoquinoline Chemical compound C1CN2CC(C(=C(OC)C=C3)OC)=C3CC2C2=C1C=C(OC)C(OC)=C2 AEQDJSLRWYMAQI-UHFFFAOYSA-N 0.000 description 1
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 1
- CBOCVOKPQGJKKJ-UHFFFAOYSA-L Calcium formate Chemical compound [Ca+2].[O-]C=O.[O-]C=O CBOCVOKPQGJKKJ-UHFFFAOYSA-L 0.000 description 1
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 239000012190 activator Substances 0.000 description 1
- 238000005054 agglomeration Methods 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- KGBXLFKZBHKPEV-UHFFFAOYSA-N boric acid Chemical compound OB(O)O KGBXLFKZBHKPEV-UHFFFAOYSA-N 0.000 description 1
- 239000004327 boric acid Substances 0.000 description 1
- 239000012267 brine Substances 0.000 description 1
- 239000000872 buffer Substances 0.000 description 1
- 239000006172 buffering agent Substances 0.000 description 1
- VSGNNIFQASZAOI-UHFFFAOYSA-L calcium acetate Chemical compound [Ca+2].CC([O-])=O.CC([O-])=O VSGNNIFQASZAOI-UHFFFAOYSA-L 0.000 description 1
- 239000001639 calcium acetate Substances 0.000 description 1
- 235000011092 calcium acetate Nutrition 0.000 description 1
- 229960005147 calcium acetate Drugs 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- 239000001110 calcium chloride Substances 0.000 description 1
- 229910001628 calcium chloride Inorganic materials 0.000 description 1
- 239000004281 calcium formate Substances 0.000 description 1
- 229940044172 calcium formate Drugs 0.000 description 1
- 235000019255 calcium formate Nutrition 0.000 description 1
- 229920003086 cellulose ether Polymers 0.000 description 1
- 239000002738 chelating agent Substances 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 239000000701 coagulant Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000002274 desiccant Substances 0.000 description 1
- 150000004683 dihydrates Chemical class 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 229910001653 ettringite Inorganic materials 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000036571 hydration Effects 0.000 description 1
- 238000006703 hydration reaction Methods 0.000 description 1
- 239000001866 hydroxypropyl methyl cellulose Substances 0.000 description 1
- 229920003088 hydroxypropyl methyl cellulose Polymers 0.000 description 1
- UFVKGYZPFZQRLF-UHFFFAOYSA-N hydroxypropyl methyl cellulose Chemical compound OC1C(O)C(OC)OC(CO)C1OC1C(O)C(O)C(OC2C(C(O)C(OC3C(C(O)C(O)C(CO)O3)O)C(CO)O2)O)C(CO)O1 UFVKGYZPFZQRLF-UHFFFAOYSA-N 0.000 description 1
- 235000010979 hydroxypropyl methyl cellulose Nutrition 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 239000002440 industrial waste Substances 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- XGZVUEUWXADBQD-UHFFFAOYSA-L lithium carbonate Chemical compound [Li+].[Li+].[O-]C([O-])=O XGZVUEUWXADBQD-UHFFFAOYSA-L 0.000 description 1
- 229910052808 lithium carbonate Inorganic materials 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- DPTATFGPDCLUTF-UHFFFAOYSA-N phosphanylidyneiron Chemical compound [Fe]#P DPTATFGPDCLUTF-UHFFFAOYSA-N 0.000 description 1
- 229920005646 polycarboxylate Polymers 0.000 description 1
- 238000005057 refrigeration Methods 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 235000012239 silicon dioxide Nutrition 0.000 description 1
- HELHAJAZNSDZJO-OLXYHTOASA-L sodium L-tartrate Chemical compound [Na+].[Na+].[O-]C(=O)[C@H](O)[C@@H](O)C([O-])=O HELHAJAZNSDZJO-OLXYHTOASA-L 0.000 description 1
- 239000000176 sodium gluconate Substances 0.000 description 1
- 235000012207 sodium gluconate Nutrition 0.000 description 1
- 229940005574 sodium gluconate Drugs 0.000 description 1
- 239000001488 sodium phosphate Substances 0.000 description 1
- 229910000162 sodium phosphate Inorganic materials 0.000 description 1
- 239000001433 sodium tartrate Substances 0.000 description 1
- 229960002167 sodium tartrate Drugs 0.000 description 1
- 235000011004 sodium tartrates Nutrition 0.000 description 1
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 239000004094 surface-active agent Substances 0.000 description 1
- RYFMWSXOAZQYPI-UHFFFAOYSA-K trisodium phosphate Chemical compound [Na+].[Na+].[Na+].[O-]P([O-])([O-])=O RYFMWSXOAZQYPI-UHFFFAOYSA-K 0.000 description 1
- 239000011882 ultra-fine particle Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Images
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
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Landscapes
- Processing Of Solid Wastes (AREA)
Abstract
The invention discloses a method for preparing a composite mineral admixture by water quenched converter slag, which comprises the steps of preparing water quenched converter slag and granulated blast furnace slag, preparing sodium hydroxide, preparing desulfurized gypsum, preparing calcium citrate, preparing cement additive, preparing magnesium sulfate and ferric hydroxide, grinding according to a certain proportion, homogenizing and mixing the water quenched converter slag, the granulated blast furnace slag, the desulfurized gypsum, the cement additive, the silica fume, the fly ash, the manganese alloy slag, the cement clinker, the limestone mining scraps and a composite chemical strength excitant, and increasing the activity index by utilizing the granulated blast furnace slag, the excitation effect of the desulfurized gypsum, the grinding assisting effect and the chemical excitation effect of the cement additive, thereby effectively improving the specific surface area and the activity index and obtaining the specific surface area of 450-500m 2 A/kg composite mineral admixture; the invention fully and reasonably utilizes a large amount of discharged converter slag, reduces environmental pollution and improves the brittleness coefficient and the freezing resistance of the concrete.
Description
Technical Field
The invention relates to the technical field of slag production processes, in particular to a method for preparing a composite mineral admixture from water quenched converter slag.
Background
Concrete is usually cement concrete which is obtained by mixing cement as cementing material, sand and stone as aggregate and water (which can contain additives and admixtures) according to a certain proportion, and has the performance problems of brittle fracture, freeze thawing fracture and the like which have been puzzled to popularization and use, and attempts are beginning to improve the performance of the concrete by improving the mineral admixtures. The addition of fly ash reduces early strength, thereby increasing early cracks; the slag powder and the silica fume have small influence on early strength, but increase shrinkage and are easy to generate shrinkage cracks, so that the single mineral admixture is not fine enough in particle size, small in specific surface area, low in activity index and weak in excitation effect, cannot exert the superposition effect of the diversified combination of the mineral admixture, has various defects, and people start to use the composite mineral admixture.
The converter slag is waste generated in converter steelmaking of iron and steel enterprises and mainly contains calcium, iron, magnesium and silicon elements, and the discharge of the converter slag causes the loss of a large amount of iron, calcium and other resources, occupies land and also causes pollution to the environment, so that the utilization of the converter slag has become a focus of attention.
The composite mineral admixture can fully utilize various industrial waste residues, reduce environmental pollution and improve the performance of concrete, so that the invention of the composite mineral admixture which takes converter slag as a raw material and can improve the characteristics of concrete and has higher specific surface area and activity index is urgently needed.
For example, the Chinese patent publication No. CN102757193A discloses a composite admixture for concrete, which is prepared from fly ash, silica fume, granulated blast furnace slag powder, anhydrous sodium sulfate, hydroxypropyl methylcellulose, a UEA expanding agent, a polycarboxylate water reducing agent, citric acid, boric acid, sodium gluconate, sodium phosphate, sodium tartrate, calcium carbonate, lithium carbonate, calcium formate, calcium acetate and cellulose ether. Although the admixture can improve the strength of concrete and improve the workability of concrete, the admixture has complex components and high cost.
For example, the Chinese patent of the invention with publication number of CN202110229772.2 discloses a production process for preparing a composite mineral admixture by using concrete residues, wherein the composite mineral admixture is prepared from the concrete residues, clinker, silica fume and mineral powder, and the admixture can improve the compactness of concrete, but does not contain grinding aid, so that the grinding time is longer, the grinding efficiency is lower, and the specific surface area is also lower.
Disclosure of Invention
The invention aims to provide a method for preparing a composite mineral admixture from water quenched converter slag, which aims to solve the problems in the background technology.
In order to achieve the above purpose, the present invention provides the following technical solutions:
a method for preparing a composite mineral admixture from water quenched converter slag is characterized by comprising the following steps: the raw materials comprise converter slag containing free calcium oxide accounting for more than or equal to 3 percent by weight, the total amount of calcium element accounting for 23 to 38 percent by weight and the total amount of iron element accounting for 8 to 28 percent by weight, and the process comprises the following steps:
s1, pouring high-temperature liquid converter slag and high-temperature liquid blast furnace slag containing molten iron into an electric furnace at the same time, adopting a graphite electrode heating mode of the electric furnace to provide heat, and enabling the two slag to be fused and combined at high temperature to obtain final slag and high-phosphorus iron which flow out of a slag hole and a iron hole of the electric furnace respectively, and recovering high-temperature flue gas.
S2, spraying water flow with a certain pressure to the high-temperature final slag, cooling the final slag suddenly, then burning the final slag to be red hot, spraying water flow to cool the final slag suddenly, and repeating the steps to generate a large amount of amorphous glass bodies and microcrystals to obtain solidified slag, wherein the solidified slag is mainly water quenched converter slag and further contains granulated blast furnace slag.
S3, crushing and grinding the water-quenched converter slag, then placing the crushed and ground water-quenched converter slag into a sodium carbonate solution for stirring and dissolving, standing and settling, and filtering to obtain filtrate 1 and water-quenched converter slag filter residues, wherein the filtrate 1 is a sodium hydroxide solution, and heating and drying to obtain sodium hydroxide solids.
S4, crushing and grinding the water quenching converter slag, then placing the crushed and ground water quenching converter slag into a magnesium chloride solution for stirring and dissolving, standing and settling, and filtering to obtain filtrate 2 which is the calcium chloride solution.
S5, adding sodium sulfate into a calcium chloride solution for stirring and dissolving, standing and settling the reacted mixed solution, filtering to obtain a filtrate 3 and a precipitate 1, wherein the filtrate 3 is the sodium chloride solution, the precipitate 1 is calcium sulfate, the calcium sulfate and water are hydrated to generate calcium sulfate dihydrate, namely gypsum, and then the gypsum is dehydrated to obtain the desulfurized gypsum with the water content of about 10%.
S6, placing the obtained water quenching converter slag filter residues into a citric acid solution for stirring and dissolving reaction, standing, settling and filtering the reacted mixed solution to obtain filtrate 4 and a solid phase, wherein the solid phase comprises an upper layer precipitate 2 and a lower layer residue 1, and the component of the upper layer precipitate 2 is calcium citrate.
S7, heating the obtained filtrate 4 to carry out hydrolysis reaction, hydrolyzing iron-containing compounds in the filtrate to generate ferric hydroxide, standing and settling the reacted mixed solution, and filtering to obtain filtrate 5 and precipitate 3, wherein the precipitate 3 is ferric hydroxide, and the filtrate 5 can be recycled to replace citric acid solution for reuse.
S8, placing the lower layer residue 1 into water, adding sulfuric acid solution, stirring and dissolving, standing and settling the reacted mixed solution, and filtering to obtain filtrate 6 and final residue, wherein the final residue is a cement additive.
S9, adding citric acid into the filtrate 6, adding magnesium oxide, stirring to dissolve the magnesium oxide until the pH value is 4.5-6.4, and obtaining filtrate 7 and precipitate 4, wherein the filtrate 7 is a magnesium sulfate solution, and the precipitate 4 is ferric hydroxide.
S10, drying the water quenched converter slag precipitate obtained in the steps, grinding and warehousing after drying, respectively warehousing the granulated blast furnace slag, the desulfurized gypsum, the cement additive, the silica fume, the fly ash, the manganese alloy slag, the cement clinker and the limestone mining scraps, proportionally conveying the mixture into a grinding system, simultaneously adding a compound chemical strength excitant, grinding until the content of the screen residue of a 0.045mm sieve is less than or equal to 12%, and controlling the specific surface area to be 450-500m 2 And/kg, obtaining the admixture.
S11, the admixture, the silica fume in the silica fume warehouse and the mineral powder in the mineral powder warehouse are metered by a metering device and conveyed to a homogenizing and mixing device for homogenizing and mixing treatment, so that the composite mineral admixture is formed.
Preferably, the mass ratio of the high-temperature liquid converter slag to the high-temperature liquid blast furnace slag in the step S1 is 1: (3-6).
Preferably, the temperature of the high-temperature liquid converter slag is 1350 ℃ to 1450 ℃.
Preferably, the water quenched converter slag in S3 and S4 is crushed and ground to 150 mu m in diameter.
Preferably, all the materials put in S3 to S9 are as follows in parts by weight:
water quenching converter slag: 30
Sodium carbonate: 2.43 to 2.71
Magnesium chloride: 7.54 to 9.60
Sodium sulfate: 9.43 to 11.14
Citric acid: 18.57 to 24.29
Sulfuric acid: 5.71 to 14.29
Magnesium oxide: 8.57 to 11.43.
Preferably, in S10, all the materials to be put in are as follows in parts by weight:
water quenching converter slag: 12 to 18
Granulating blast furnace slag: 15 to 25
Desulfurization gypsum: 2 to 6
Cement additive: 0.1 to 0.5
Silica fume: 11 to 17
Fly ash: 9 to 15
Manganese alloy slag: 8 to 18
Cement clinker: 3 to 7
Limestone mining debris: 5 to 12
Composite chemical strength excitant: 1 to 2.
Preferably, the upper layer precipitate of the solid phase in S6 is white in appearance, has a density higher than that of the supernatant and lower layer residue, is smaller than that of the lower layer residue, has a gray brown color, has a distinct color difference, and can be separated from the solid phase by a spoon, and the boundary part of the two layers remains in the lower layer residue without separation.
Preferably, the main mineral component of the desulfurized gypsum is CaSO 4 ·2H 2 O, also contains a small amount of CaCO 3 And SiO 2 And the like.
Preferably, the cement additive is a cement grinding aid, and the main component of the cement additive contains triethyl amine trisulphonate.
Preferably, the granulated blast furnace slag is a product of solid waste slag discharged in an iron-making process after water quenching and quenching, and the main component is aluminosilicate.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.
Compared with the prior art, the invention has the beneficial effects that: by combining the characteristics of converter slag and blast furnace slag, the silicon dioxide in the blast furnace slag is utilized to improve free calcium oxide in the converter slag and reduce the alkalinity of the converter slag, the obtained high-phosphorus molten iron can be used as a raw material of high-phosphorus steel, the use amount of phosphorus iron can be reduced, the environmental pollution is reduced, the rigidity of the converter slag is improved through water quenching treatment, the converter slag is convenient to drag out, and the calcium chloride obtained through substitution reaction by adding magnesium chloride can be used as brine, drying agent and the like in refrigeration equipment. The desulfurization gypsum plays an excitation role in the process, and the sulfate excitation mechanism mainly refers to that CaO is in SO 4 2- At Ca 2+ Is active Al dissolved in liquid phase under the action of 2 O 3 The reaction generates stable ettringite, thereby facilitating Ca 2+ Diffuse into the inside of the fly ash particles and react with the inside active Al 2 O 3 And SiO 2 The reaction improves the activity reaction degree of the fly ash, and on the other hand, the dihydrate gypsum in the desulfurized gypsum can promote C in the cement clinker 3 S is hydrated, and simultaneously the soluble impurity ions and CaCO thereof 3 The presence of (2) is beneficial to accelerating the hydration of the cement, so that the desulfurized gypsum has the dual effects of alkaline excitation and sulfate excitation. The cement additive can effectively improve the specific surface area and enhance the excitation effect, so as to improve the strength of concrete, when all materials are put into a grinding system for grinding, the materials are subjected to static electricity generation by intense and frequent and complex friction and impact, the materials are adsorbed on the surface of a grinding body to generate a buffer effect, the utilization rate of mechanical energy and the grinding yield in the grinding process are reduced, and the triethyl amine trisulphonate in the cement additive has trivalent nitrogen group in molecules, is a good surfactant, can quickly eliminate static charges generated in the grinding process, has a certain adsorption capacity, is further firmly adsorbed on the surface of the materials to prevent the materials from being mutually bonded, and can quickly permeate among cracks of material particles to weaken the molecular force generation of the materials And promote the expansion of cracks in particles when the outside does work, thereby improving grinding efficiency and further effectively improving specific surface area. The potential activity of the granulated blast furnace slag is larger, and the granulated blast furnace slag has high activity after being excited by alkali or sulfate, but is difficult to grind, so that the grinding degree of the grinding aid can be improved by adding the grinding aid, thereby improving the reactivity, increasing the activity index and shortening the reaction time.
Drawings
FIG. 1 is a schematic flow chart of the preparation method of the invention.
Detailed Description
All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The invention provides a technical scheme that: a method for preparing composite mineral admixture by water quenching converter slag comprises the following steps of:
s1, pouring high-temperature liquid converter slag and high-temperature liquid blast furnace slag containing molten iron into an electric furnace at the same time, adopting a graphite electrode heating mode of the electric furnace to provide heat, and enabling the two slag to be fused and combined at high temperature to obtain final slag and high-phosphorus iron which respectively flow out of a slag hole and a iron hole of the electric furnace, and recovering high-temperature flue gas;
S2, spraying water flow with a certain pressure to the high-temperature final slag to cool the final slag suddenly, then burning the final slag to be red hot, spraying water flow to cool the final slag suddenly, and repeating the steps to generate a large amount of amorphous glass bodies and microcrystals to obtain solidified slag, wherein the solidified slag is mainly water quenched converter slag and further contains granulated blast furnace slag;
s3, crushing and grinding the water-quenched converter slag, then placing the crushed and ground water-quenched converter slag into a sodium carbonate solution for stirring and dissolving, standing and settling, and filtering to obtain filtrate 1 and water-quenched converter slag filter residues, wherein the filtrate 1 is a sodium hydroxide solution, and heating and drying to obtain a sodium hydroxide solid;
s4, crushing and grinding water quenching converter slag, then placing the crushed and ground water quenching converter slag into a magnesium chloride solution for stirring and dissolving, standing and settling, and filtering to obtain filtrate 2 which is a calcium chloride solution;
s5, adding sodium sulfate into a calcium chloride solution for stirring and dissolving, standing and settling the reacted mixed solution, filtering to obtain a filtrate 3 and a precipitate 1, wherein the filtrate 3 is the sodium chloride solution, the precipitate 1 is calcium sulfate, the calcium sulfate and water are hydrated to generate calcium sulfate dihydrate, namely gypsum, and then the gypsum is dehydrated to obtain desulfurized gypsum with water content of about 10%;
s6, placing the obtained water quenching converter slag filter residues in a citric acid solution for stirring and dissolving reaction, standing, settling and filtering the mixed solution after the reaction to obtain filtrate 4 and a solid phase, wherein the solid phase comprises an upper layer precipitate 2 and a lower layer residue 1, and the component of the upper layer precipitate 2 is calcium citrate;
S7, heating the obtained filtrate 4 to perform hydrolysis reaction, hydrolyzing iron-containing compounds in the filtrate to generate ferric hydroxide, standing the reacted mixed solution for sedimentation, and filtering to obtain filtrate 5 and precipitate 3, wherein the precipitate 3 is ferric hydroxide, and the filtrate 5 can be recycled to replace citric acid solution for reuse;
s8, placing the lower layer residue 1 into water, adding sulfuric acid solution, stirring and dissolving for reaction, standing and settling the reacted mixed solution, and filtering to obtain filtrate 6 and final residue, wherein the final residue is a cement additive;
s9, adding citric acid into the filtrate 6, adding magnesium oxide, stirring to dissolve the magnesium oxide until the pH value is 4.5-6.4, and obtaining filtrate 7 and precipitate 4, wherein the filtrate 7 is a magnesium sulfate solution, and the precipitate 4 is ferric hydroxide;
s10, drying the water quenched converter slag precipitate obtained in the steps, grinding and warehousing after drying, respectively warehousing the granulated blast furnace slag, the desulfurized gypsum, the cement additive, the silica fume, the fly ash, the manganese alloy slag, the cement clinker and the limestone mining scraps, proportionally conveying the mixture into a grinding system, simultaneously adding a compound chemical strength excitant, grinding until the content of the screen residue of a 0.045mm sieve is less than or equal to 12%, and controlling the specific surface area to be 450-500m 2 Kg, obtaining an admixture;
s11, the admixture, the silica fume in the silica fume warehouse and the mineral powder in the mineral powder warehouse are metered by a metering device and conveyed to a homogenizing and mixing device for homogenizing and mixing treatment, so that the composite mineral admixture is formed.
Wherein, the mass ratio of the high-temperature liquid converter slag to the high-temperature liquid blast furnace slag in the S1 is 1: (3-6).
Wherein the temperature of the high-temperature liquid converter slag is 1350-1450 ℃.
Wherein, the water quenching converter slag in S3 and S4 is crushed and ground to the diameter of 150 mu m.
Wherein, all the materials put in S3-S9 are as follows by weight:
water quenching converter slag: 30
Sodium carbonate: 2.43 to 2.71
Magnesium chloride: 7.54 to 9.60
Sodium sulfate: 9.43 to 11.14
Citric acid: 18.57 to 24.29
Sulfuric acid: 5.71 to 14.29
Magnesium oxide: 8.57 to 11.43.
Wherein, in the step S10, all the materials put in are as follows in parts by weight:
water quenching converter slag: 12 to 18
Granulating blast furnace slag: 15 to 25
Desulfurization gypsum: 2 to 6
Cement additive: 0.1 to 0.5
Silica fume: 11 to 17
Fly ash: 9 to 15
Manganese alloy slag: 8 to 18
Cement clinker: 3 to 7
Limestone mining debris: 5 to 12
Composite chemical strength excitant: 1 to 2.
The upper layer sediment of the solid phase in S6 is white in appearance, higher in density than the supernatant and lower in lower layer residue, the lower layer residue is gray brown in appearance, the color difference is obvious, the upper layer sediment can be separated from the solid phase by using a spoon, the two-layer boundary part is not separated and still remains in the lower layer residue, the two-layer boundary part can be prevented from being mixed into the upper layer sediment calcium citrate, the purity of the calcium citrate is ensured, and the calcium citrate can be used as a chelating agent, a buffering agent, a tissue coagulating agent and the like.
Wherein the main mineral component of the desulfurized gypsum is CaSO 4 ·2H 2 O, also contains a small amount of CaCO 3 And SiO 2 And the like, and has the dual effects of alkaline excitation and sulfate excitation.
The cement additive is a chemical additive for improving the grinding effect and performance of cement, can remarkably improve the grinding yield and strength of cement at each age, can greatly reduce the electrostatic adsorption ball-packing phenomenon formed in the grinding process, can reduce the re-agglomeration trend of ultrafine particles formed in the grinding process, can reduce the over-grinding phenomenon, can improve the fluidity of cement, can improve the grinding efficiency, can reduce the grinding energy consumption, can be used as a chemical activator, can improve the distribution of cement particles and excite the activity of each mixed material, and can further improve the early strength and the later strength.
The granulated blast furnace slag is a product of solid waste slag discharged in the iron-making process after water quenching, the vitreous structure of the granulated blast furnace slag contains higher energy, the main component is aluminosilicate, the potential activity is high, the granulated blast furnace slag has high activity after being excited by alkalinity or sulfate, the reactivity can be improved, the activity index is increased, and the reaction time is shortened.
Example 1
The preparation cost of this embodiment is the lowest, and the scheme is as follows:
(1) Pouring 1 ton of high-temperature liquid converter slag and 3 tons of high-temperature liquid blast furnace slag containing molten iron into an electric furnace at the same time, adopting a graphite electrode heating mode of the electric furnace to provide heat, and enabling the two slag to be fused and combined at high temperature to obtain final slag and high-phosphorus iron which flow out of a slag hole and a iron hole of the electric furnace respectively, and recovering high-temperature flue gas.
(2) The high temperature final slag is cooled suddenly by water jet with a certain pressure, and then is red hot, and then is cooled suddenly by water jet, and the above-mentioned steps are repeated to produce a large amount of amorphous glass body and microcrystal, so that the solidified slag is obtained, and the solidified slag is mainly water quenched converter slag and contains granulated blast furnace slag.
(3) Crushing and grinding 30 parts of water-quenched converter slag, preparing a sodium carbonate solution from 2.5 parts of sodium carbonate and 100 parts of water, placing water-quenched converter slag powder into the sodium carbonate solution for stirring and dissolving, standing for sedimentation, and filtering to obtain water-quenched converter slag filter residues.
(4) Crushing and grinding 30 parts of water-quenched converter slag, preparing 8 parts of magnesium chloride and 100 parts of water into a magnesium chloride solution, placing water-quenched converter slag powder into the magnesium chloride solution for stirring and dissolving, standing and settling, and filtering to obtain a calcium chloride solution.
(5) Adding 10 parts of sodium sulfate into a calcium chloride solution, stirring and dissolving, standing and settling the reacted mixed solution, filtering to obtain calcium sulfate, hydrating the calcium sulfate and water to generate calcium sulfate dihydrate, namely gypsum, and dehydrating to obtain the desulfurized gypsum with the water content of about 10%.
(6) And (3) placing the water-quenched converter slag filter residues obtained in the step (3) into 20 parts of citric acid solution for stirring and dissolving reaction, standing and settling the reacted mixed solution, and filtering to obtain calcium citrate and lower-layer residues.
(7) Heating the filtrate obtained in the step (6) to perform hydrolysis reaction, hydrolyzing iron-containing compounds in the filtrate to generate ferric hydroxide, standing the reacted mixed solution for sedimentation, and filtering to obtain ferric hydroxide, wherein the filtrate can be recycled to replace the citric acid solution in the step (6) for reuse.
(8) And (3) placing the lower layer residue in the step (6) into water, adding 10 parts of sulfuric acid solution, stirring and dissolving the solution, standing and settling the reacted mixed solution, and filtering the mixed solution to obtain the cement additive.
(9) And (3) adding 20 parts of citric acid into the filtrate obtained in the step (6), adding 10 parts of magnesium oxide, and stirring to dissolve the magnesium oxide until the pH value is 4.5-6.4, thereby obtaining a magnesium sulfate solution and ferric hydroxide.
(10) Drying the water quenched converter slag precipitate obtained in the steps, grinding and warehousing after drying, and warehousing the granulated blast furnace slag, the desulfurized gypsum, the cement additive, the silica fume, the fly ash, the manganese alloy slag, the cement clinker and the limestone mining scraps respectively according to the proportion of 120:150:20:1:150:120 140:50:90 is conveyed into a grinding system, 1.5 parts of compound chemical strength exciting agent is mixed, and the mixture is ground until the screen residue content of a 0.045mm screen is less than or equal to 12%, and the specific surface area is controlled to be 450-500m 2 And/kg, obtaining the admixture.
(11) And (3) simultaneously metering the admixture, the silica fume in the silica fume warehouse and the mineral powder in the mineral powder warehouse through metering equipment, and conveying the metered admixture to homogenizing mixing equipment for homogenizing mixing treatment to form the composite mineral admixture.
Example 2
The embodiment increases the proportion of the water quenching converter slag to reduce the brittleness coefficient and the freeze thawing mass loss rate of the concrete, and the scheme is as follows:
(1) Pouring 1 ton of high-temperature liquid converter slag and 3 tons of high-temperature liquid blast furnace slag containing molten iron into an electric furnace at the same time, adopting a graphite electrode heating mode of the electric furnace to provide heat, and enabling the two slag to be fused and combined at high temperature to obtain final slag and high-phosphorus iron which flow out of a slag hole and a iron hole of the electric furnace respectively, and recovering high-temperature flue gas.
(2) The high temperature final slag is cooled suddenly by water jet with a certain pressure, and then is red hot, and then is cooled suddenly by water jet, and the above-mentioned steps are repeated to produce a large amount of amorphous glass body and microcrystal, so that the solidified slag is obtained, and the solidified slag is mainly water quenched converter slag and contains granulated blast furnace slag.
(3) Crushing and grinding 30 parts of water-quenched converter slag, preparing a sodium carbonate solution from 2.5 parts of sodium carbonate and 100 parts of water, placing water-quenched converter slag powder into the sodium carbonate solution for stirring and dissolving, standing for sedimentation, and filtering to obtain water-quenched converter slag filter residues.
(4) Crushing and grinding 30 parts of water-quenched converter slag, preparing 8 parts of magnesium chloride and 100 parts of water into a magnesium chloride solution, placing water-quenched converter slag powder into the magnesium chloride solution for stirring and dissolving, standing and settling, and filtering to obtain a calcium chloride solution.
(5) Adding 10 parts of sodium sulfate into a calcium chloride solution, stirring and dissolving, standing and settling the reacted mixed solution, filtering to obtain calcium sulfate, hydrating the calcium sulfate and water to generate calcium sulfate dihydrate, namely gypsum, and dehydrating to obtain the desulfurized gypsum with the water content of about 10%.
(6) And (3) placing the water-quenched converter slag filter residues obtained in the step (3) into 20 parts of citric acid solution for stirring and dissolving reaction, standing and settling the reacted mixed solution, and filtering to obtain calcium citrate and lower-layer residues.
(7) Heating the filtrate obtained in the step (6) to perform hydrolysis reaction, hydrolyzing iron-containing compounds in the filtrate to generate ferric hydroxide, standing the reacted mixed solution for sedimentation, and filtering to obtain ferric hydroxide, wherein the filtrate can be recycled to replace the citric acid solution in the step (6) for reuse.
(8) And (3) placing the lower layer residue in the step (6) into water, adding 10 parts of sulfuric acid solution, stirring and dissolving the solution, standing and settling the reacted mixed solution, and filtering the mixed solution to obtain the cement additive.
(9) And (3) adding 20 parts of citric acid into the filtrate obtained in the step (6), adding 10 parts of magnesium oxide, and stirring to dissolve the magnesium oxide until the pH value is 4.5-6.4, thereby obtaining a magnesium sulfate solution and ferric hydroxide.
(10) Drying the water quenched converter slag precipitate obtained in the steps, grinding and warehousing after drying, respectively warehousing granulated blast furnace slag, desulfurized gypsum, cement additives, silica fume, fly ash, manganese alloy slag, cement clinker and limestone mining scraps, conveying the mixture into a grinding system according to the proportion of 160:150:20:1:150:120:140:50:90, simultaneously doping 1.5 parts of composite chemical strength excitant, grinding until the content of screen residues of a 0.045mm sieve is less than or equal to 12%, and controlling the specific surface area to be 450-500m 2 And/kg, obtaining the admixture.
(11) And (3) simultaneously metering the admixture, the silica fume in the silica fume warehouse and the mineral powder in the mineral powder warehouse through metering equipment, and conveying the metered admixture to homogenizing mixing equipment for homogenizing mixing treatment to form the composite mineral admixture.
Example 3
The embodiment increases the proportion of the granulated blast furnace slag to improve the activity index of the composite mineral admixture, and the scheme is as follows:
(1) Pouring 1 ton of high-temperature liquid converter slag and 3 tons of high-temperature liquid blast furnace slag containing molten iron into an electric furnace at the same time, adopting a graphite electrode heating mode of the electric furnace to provide heat, and enabling the two slag to be fused and combined at high temperature to obtain final slag and high-phosphorus iron which flow out of a slag hole and a iron hole of the electric furnace respectively, and recovering high-temperature flue gas.
(2) The high temperature final slag is cooled suddenly by water jet with a certain pressure, and then is red hot, and then is cooled suddenly by water jet, and the above-mentioned steps are repeated to produce a large amount of amorphous glass body and microcrystal, so that the solidified slag is obtained, and the solidified slag is mainly water quenched converter slag and contains granulated blast furnace slag.
(3) Crushing and grinding 30 parts of water-quenched converter slag, preparing a sodium carbonate solution from 2.5 parts of sodium carbonate and 100 parts of water, placing water-quenched converter slag powder into the sodium carbonate solution for stirring and dissolving, standing for sedimentation, and filtering to obtain water-quenched converter slag filter residues.
(4) Crushing and grinding 30 parts of water-quenched converter slag, preparing 8 parts of magnesium chloride and 100 parts of water into a magnesium chloride solution, placing water-quenched converter slag powder into the magnesium chloride solution for stirring and dissolving, standing and settling, and filtering to obtain a calcium chloride solution.
(5) Adding 10 parts of sodium sulfate into a calcium chloride solution, stirring and dissolving, standing and settling the reacted mixed solution, filtering to obtain calcium sulfate, hydrating the calcium sulfate and water to generate calcium sulfate dihydrate, namely gypsum, and dehydrating to obtain the desulfurized gypsum with the water content of about 10%.
(6) And (3) placing the water-quenched converter slag filter residues obtained in the step (3) into 20 parts of citric acid solution for stirring and dissolving reaction, standing and settling the reacted mixed solution, and filtering to obtain calcium citrate and lower-layer residues.
(7) Heating the filtrate obtained in the step (6) to perform hydrolysis reaction, hydrolyzing iron-containing compounds in the filtrate to generate ferric hydroxide, standing the reacted mixed solution for sedimentation, and filtering to obtain ferric hydroxide, wherein the filtrate can be recycled to replace the citric acid solution in the step (6) for reuse.
(8) And (3) placing the lower layer residue in the step (6) into water, adding 10 parts of sulfuric acid solution, stirring and dissolving the solution, standing and settling the reacted mixed solution, and filtering the mixed solution to obtain the cement additive.
(9) And (3) adding 20 parts of citric acid into the filtrate obtained in the step (6), adding 10 parts of magnesium oxide, and stirring to dissolve the magnesium oxide until the pH value is 4.5-6.4, thereby obtaining a magnesium sulfate solution and ferric hydroxide.
(10) Drying the water quenched converter slag precipitate obtained in the steps, grinding and warehousing after drying, respectively warehousing granulated blast furnace slag, desulfurized gypsum, cement additives, silica fume, fly ash, manganese alloy slag, cement clinker and limestone mining scraps, conveying the mixture into a grinding system according to the proportion of 120:220:20:1:150:120:140:50:90, simultaneously doping 1.5 parts of composite chemical strength excitant, grinding until the content of screen residue of a 0.045mm sieve is less than or equal to 12%, and controlling the specific surface area to be 450-500m 2 And/kg, obtaining the admixture.
(11) And (3) simultaneously metering the admixture, the silica fume in the silica fume warehouse and the mineral powder in the mineral powder warehouse through metering equipment, and conveying the metered admixture to homogenizing mixing equipment for homogenizing mixing treatment to form the composite mineral admixture.
Example 4
The embodiment increases the proportion of the desulfurized gypsum to enhance the excitation of the composite mineral admixture, and the scheme is as follows:
(1) Pouring 1 ton of high-temperature liquid converter slag and 3 tons of high-temperature liquid blast furnace slag containing molten iron into an electric furnace at the same time, adopting a graphite electrode heating mode of the electric furnace to provide heat, and enabling the two slag to be fused and combined at high temperature to obtain final slag and high-phosphorus iron which flow out of a slag hole and a iron hole of the electric furnace respectively, and recovering high-temperature flue gas.
(2) The high temperature final slag is cooled suddenly by water jet with a certain pressure, and then is red hot, and then is cooled suddenly by water jet, and the above-mentioned steps are repeated to produce a large amount of amorphous glass body and microcrystal, so that the solidified slag is obtained, and the solidified slag is mainly water quenched converter slag and contains granulated blast furnace slag.
(3) Crushing and grinding 30 parts of water-quenched converter slag, preparing a sodium carbonate solution from 2.5 parts of sodium carbonate and 100 parts of water, placing water-quenched converter slag powder into the sodium carbonate solution for stirring and dissolving, standing for sedimentation, and filtering to obtain water-quenched converter slag filter residues.
(4) Crushing and grinding 30 parts of water-quenched converter slag, preparing 8 parts of magnesium chloride and 100 parts of water into a magnesium chloride solution, placing water-quenched converter slag powder into the magnesium chloride solution for stirring and dissolving, standing and settling, and filtering to obtain a calcium chloride solution.
(5) Adding 10 parts of sodium sulfate into a calcium chloride solution, stirring and dissolving, standing and settling the reacted mixed solution, filtering to obtain calcium sulfate, hydrating the calcium sulfate and water to generate calcium sulfate dihydrate, namely gypsum, and dehydrating to obtain the desulfurized gypsum with the water content of about 10%.
(6) And (3) placing the water-quenched converter slag filter residues obtained in the step (3) into 20 parts of citric acid solution for stirring and dissolving reaction, standing and settling the reacted mixed solution, and filtering to obtain calcium citrate and lower-layer residues.
(7) Heating the filtrate obtained in the step (6) to perform hydrolysis reaction, hydrolyzing iron-containing compounds in the filtrate to generate ferric hydroxide, standing the reacted mixed solution for sedimentation, and filtering to obtain ferric hydroxide, wherein the filtrate can be recycled to replace the citric acid solution in the step (6) for reuse.
(8) And (3) placing the lower layer residue in the step (6) into water, adding 10 parts of sulfuric acid solution, stirring and dissolving the solution, standing and settling the reacted mixed solution, and filtering the mixed solution to obtain the cement additive.
(9) And (3) adding 20 parts of citric acid into the filtrate obtained in the step (6), adding 10 parts of magnesium oxide, and stirring to dissolve the magnesium oxide until the pH value is 4.5-6.4, thereby obtaining a magnesium sulfate solution and ferric hydroxide.
(10) Drying the water quenched converter slag precipitate obtained in the steps, grinding and warehousing after drying, respectively warehousing granulated blast furnace slag, desulfurized gypsum, cement additives, silica fume, fly ash, manganese alloy slag, cement clinker and limestone mining scraps, conveying the mixture into a grinding system according to the proportion of 120:150:50:1:150:120:140:50:90, simultaneously doping 1.5 parts of composite chemical strength excitant, grinding until the content of screen residue of a 0.045mm sieve is less than or equal to 12%, and controlling the specific surface area to be 450-500m 2 And/kg, obtaining the admixture.
(11) And (3) simultaneously metering the admixture, the silica fume in the silica fume warehouse and the mineral powder in the mineral powder warehouse through metering equipment, and conveying the metered admixture to homogenizing mixing equipment for homogenizing mixing treatment to form the composite mineral admixture.
Example 5
The embodiment increases the proportion of the cement additive to improve the grinding efficiency and the excitation effect of the composite mineral admixture, and the scheme is as follows:
(1) Pouring 1 ton of high-temperature liquid converter slag and 3 tons of high-temperature liquid blast furnace slag containing molten iron into an electric furnace at the same time, adopting a graphite electrode heating mode of the electric furnace to provide heat, and enabling the two slag to be fused and combined at high temperature to obtain final slag and high-phosphorus iron which flow out of a slag hole and a iron hole of the electric furnace respectively, and recovering high-temperature flue gas.
(2) The high temperature final slag is cooled suddenly by water jet with a certain pressure, and then is red hot, and then is cooled suddenly by water jet, and the above-mentioned steps are repeated to produce a large amount of amorphous glass body and microcrystal, so that the solidified slag is obtained, and the solidified slag is mainly water quenched converter slag and contains granulated blast furnace slag.
(3) Crushing and grinding 30 parts of water-quenched converter slag, preparing a sodium carbonate solution from 2.5 parts of sodium carbonate and 100 parts of water, placing water-quenched converter slag powder into the sodium carbonate solution for stirring and dissolving, standing for sedimentation, and filtering to obtain water-quenched converter slag filter residues.
(4) Crushing and grinding 30 parts of water-quenched converter slag, preparing 8 parts of magnesium chloride and 100 parts of water into a magnesium chloride solution, placing water-quenched converter slag powder into the magnesium chloride solution for stirring and dissolving, standing and settling, and filtering to obtain a calcium chloride solution.
(5) Adding 10 parts of sodium sulfate into a calcium chloride solution, stirring and dissolving, standing and settling the reacted mixed solution, filtering to obtain calcium sulfate, hydrating the calcium sulfate and water to generate calcium sulfate dihydrate, namely gypsum, and dehydrating to obtain the desulfurized gypsum with the water content of about 10%.
(6) And (3) placing the water-quenched converter slag filter residues obtained in the step (3) into 20 parts of citric acid solution for stirring and dissolving reaction, standing and settling the reacted mixed solution, and filtering to obtain calcium citrate and lower-layer residues.
(7) Heating the filtrate obtained in the step (6) to perform hydrolysis reaction, hydrolyzing iron-containing compounds in the filtrate to generate ferric hydroxide, standing the reacted mixed solution for sedimentation, and filtering to obtain ferric hydroxide, wherein the filtrate can be recycled to replace the citric acid solution in the step (6) for reuse.
(8) And (3) placing the lower layer residue in the step (6) into water, adding 10 parts of sulfuric acid solution, stirring and dissolving the solution, standing and settling the reacted mixed solution, and filtering the mixed solution to obtain the cement additive.
(9) And (3) adding 20 parts of citric acid into the filtrate obtained in the step (6), adding 10 parts of magnesium oxide, and stirring to dissolve the magnesium oxide until the pH value is 4.5-6.4, thereby obtaining a magnesium sulfate solution and ferric hydroxide.
(10) Drying the water quenched converter slag precipitate obtained in the steps, grinding and warehousing after drying, respectively warehousing granulated blast furnace slag, desulfurized gypsum, cement additives, silica fume, fly ash, manganese alloy slag, cement clinker and limestone mining scraps, conveying the mixture into a grinding system according to the proportion of 120:150:20:5:150:120:140:50:90, simultaneously doping 1.5 parts of composite chemical strength excitant, grinding until the content of screen residue of a 0.045mm sieve is less than or equal to 12%, and controlling the specific surface area to be 450-500m 2 And/kg, obtaining the admixture.
(11) And (3) simultaneously metering the admixture, the silica fume in the silica fume warehouse and the mineral powder in the mineral powder warehouse through metering equipment, and conveying the metered admixture to homogenizing mixing equipment for homogenizing mixing treatment to form the composite mineral admixture.
Example 6
The embodiment simultaneously increases the proportion of water quenched converter slag, granulated blast furnace slag, desulfurized gypsum and cement additives so as to improve the grinding efficiency and activity index of the composite mineral admixture and enhance the excitation effect of the composite mineral admixture, and aims to improve the compressive strength and flexural strength of concrete and reduce the brittleness coefficient and freeze-thawing mass loss rate of the concrete, and the scheme is as follows:
(1) Pouring 1 ton of high-temperature liquid converter slag and 3 tons of high-temperature liquid blast furnace slag containing molten iron into an electric furnace at the same time, adopting a graphite electrode heating mode of the electric furnace to provide heat, and enabling the two slag to be fused and combined at high temperature to obtain final slag and high-phosphorus iron which flow out of a slag hole and a iron hole of the electric furnace respectively, and recovering high-temperature flue gas.
(2) The high temperature final slag is cooled suddenly by water jet with a certain pressure, and then is red hot, and then is cooled suddenly by water jet, and the above-mentioned steps are repeated to produce a large amount of amorphous glass body and microcrystal, so that the solidified slag is obtained, and the solidified slag is mainly water quenched converter slag and contains granulated blast furnace slag.
(3) Crushing and grinding 30 parts of water-quenched converter slag, preparing a sodium carbonate solution from 2.5 parts of sodium carbonate and 100 parts of water, placing water-quenched converter slag powder into the sodium carbonate solution for stirring and dissolving, standing for sedimentation, and filtering to obtain water-quenched converter slag filter residues.
(4) Crushing and grinding 30 parts of water-quenched converter slag, preparing 8 parts of magnesium chloride and 100 parts of water into a magnesium chloride solution, placing water-quenched converter slag powder into the magnesium chloride solution for stirring and dissolving, standing and settling, and filtering to obtain a calcium chloride solution.
(5) Adding 10 parts of sodium sulfate into a calcium chloride solution, stirring and dissolving, standing and settling the reacted mixed solution, filtering to obtain calcium sulfate, hydrating the calcium sulfate and water to generate calcium sulfate dihydrate, namely gypsum, and dehydrating to obtain the desulfurized gypsum with the water content of about 10%.
(6) And (3) placing the water-quenched converter slag filter residues obtained in the step (3) into 20 parts of citric acid solution for stirring and dissolving reaction, standing and settling the reacted mixed solution, and filtering to obtain calcium citrate and lower-layer residues.
(7) Heating the filtrate obtained in the step (6) to perform hydrolysis reaction, hydrolyzing iron-containing compounds in the filtrate to generate ferric hydroxide, standing the reacted mixed solution for sedimentation, and filtering to obtain ferric hydroxide, wherein the filtrate can be recycled to replace the citric acid solution in the step (6) for reuse.
(8) And (3) placing the lower layer residue in the step (6) into water, adding 10 parts of sulfuric acid solution, stirring and dissolving the solution, standing and settling the reacted mixed solution, and filtering the mixed solution to obtain the cement additive.
(9) And (3) adding 20 parts of citric acid into the filtrate obtained in the step (6), adding 10 parts of magnesium oxide, and stirring to dissolve the magnesium oxide until the pH value is 4.5-6.4, thereby obtaining a magnesium sulfate solution and ferric hydroxide.
(10) Drying the water quenched converter slag precipitate obtained in the steps, grinding and warehousing after drying, respectively warehousing granulated blast furnace slag, desulfurized gypsum, cement additives, silica fume, fly ash, manganese alloy slag, cement clinker and limestone mining scraps, conveying the water quenched converter slag precipitate into a grinding system according to the proportion of 160:220:50:5:150:120:140:50:90, and simultaneously doping 1.5 parts of composite componentsThe chemical strength excitant is ground until the screen residue content of a 0.045mm screen is less than or equal to 12%, and the specific surface area is controlled between 450 and 500m 2 And/kg, obtaining the admixture.
(11) And (3) simultaneously metering the admixture, the silica fume in the silica fume warehouse and the mineral powder in the mineral powder warehouse through metering equipment, and conveying the metered admixture to homogenizing mixing equipment for homogenizing mixing treatment to form the composite mineral admixture.
Performance testing
The invention detects the physical property experiment of the concrete:
1. setting blank group
Grinding and homogenizing silica fume, fly ash, manganese alloy slag, cement clinker, limestone mining scraps and a composite chemical strength excitant according to the proportion of 150:120:140:50:90:1.5 to obtain a blank group composite mineral admixture.
2. Coefficient of brittleness
The brittleness coefficient is defined as the ratio of the compressive strength to the flexural strength of the concrete, the test designs of the series of the proportions of the examples 1, 2, 3, 4, 5 and 6 are respectively set to 0.6, the water-gel ratio is set to 0.6, the substitution rate of the composite mineral admixture is 5%, the test piece age is 28d, and the strength grade of the concrete is C30.
The compressive strength test was performed as follows: the concrete cube test piece size is 150×150X150 mm, place before the pressure testing machine, clean test piece surface and upper and lower bearing plate surface, use the side when the test piece is fashioned as the bearing surface, place the test piece on the holding down plate of testing machine, the center of test piece aligns with the holding down plate center, start the pressure testing machine, the continuous even loading of test process, the loading speed gets 0.5 ~ 0.8MPa/s, when the test piece is close to destroying and begins rapid deformation, stop adjusting the testing machine throttle, until destroying, and record the destruction load. The compressive strength of the concrete cube test piece is calculated according to the following formula:
wherein: f (f) cc Concrete cube test piece compressive strength (MPa),the calculation result is accurate to 0.1MPa;
f, a concrete cube test piece damage load (N);
a-bearing area (mm) of concrete cube test piece 2 )。
The flexural strength test was performed as follows: the concrete test piece is 150X 550mm in size, the surface of the test piece is cleaned before being placed in a flexural strength test device, the position of a loading line is drawn on the side surface of the test piece, the pressure bearing surface of the test piece is the side surface of the test piece during molding, the test process is continuously and evenly loaded, the loading speed is 0.05-0.08 MPa/s, when the test piece is close to damage, the accelerator of the test machine is stopped to be adjusted until the test piece is damaged, and the damage load and the breaking position of the lower edge of the test piece are recorded. The flexural strength of the concrete test piece is calculated according to the following formula:
wherein: f (f) f -flexural strength (MPa) of concrete, the calculation result being accurate to 0.1MPa;
f, test piece damage load (N);
l-span between supports (mm);
b-test piece section width (mm);
h-the height of the section of the test piece (mm).
The finished products in examples were subjected to compressive strength and flexural strength tests, and the test results are shown in Table 1.
Table 1 compressive and flexural strength test of concrete
| Physical Properties of concrete | Compressive Strength | Flexural Strength |
| Blank group | 34.4 | 4.02 |
| Example 1 | 37.6 | 4.51 |
| Example 2 | 40.7 | 4.98 |
| Example 3 | 43.6 | 5.31 |
| Example 4 | 42.5 | 5.13 |
| Example 5 | 41.4 | 5.03 |
| Example 6 | 47.1 | 5.84 |
3. Freezing resistance
The freezing resistance is represented by mass loss rate after freeze thawing cycle, the test design examples 1, 2, 3, 4, 5 and 6 are series proportion, the water-gel ratio is set to 0.6, the substitution rate of the composite mineral admixture is 5%, and the strength grade of the concrete is C30. Taking out the test piece when the curing age of the test piece reaches 28d, measuring the appearance size of the test piece, and putting the test piece into a test The center position in the box is used for placing the box into a test piece frame in a freeze thawing box, clean water is injected into the box, the water level in the box is always kept at least 5mm higher than the top surface of the test piece, the damage to the box is checked every 25 freeze thawing cycles, and the mass W of the test piece is weighed ni After the test is finished, quickly turning the test piece around, reloading the test piece into a test piece box, adding clear water for continuous test, stopping the test when the specified freeze-thawing cycle times are reached or the mass loss rate of the test piece reaches 5%, wherein the mass loss rate of a single test piece is calculated according to the following formula:
wherein: deltaW ni -the mass loss rate (%) of the ith concrete specimen after N freeze-thawing cycles is accurate to 0.01;
W 0i -mass (g) of the ith concrete test piece before freeze-thaw cycle test;
W ni -mass (g) of the i-th concrete test piece after N freeze-thawing cycles.
The finished products in the examples were subjected to physical property brittleness coefficient and freezing resistance test, and the results are shown in the following table 2:
TABLE 2 brittleness coefficient and freeze-thaw Mass loss Rate of concrete
Through the brittleness coefficient test and the freezing resistance test of the concrete, we obtain a preliminary conclusion:
the invention comprises 12 to 18 parts of water quenching converter slag, 15 to 25 parts of granulated blast furnace slag, 2 to 6 parts of desulfurized gypsum, 0.1 to 0.5 part of cement additive, 15 parts of silica fume, 12 parts of fly ash, 14 parts of manganese alloy slag, 5 parts of cement clinker, 9 parts of limestone mining scraps and 1.5 parts of compound chemistry Mixing the strength excitant, preparing raw materials according to the proportion, grinding the raw materials until the screen residue content of a 0.045mm screen is less than or equal to 12%, and homogenizing to obtain the product with the specific surface area controlled between 450 and 500m 2 The water-gel ratio of the composite mineral admixture is set to be 0.6, the substitution rate of the composite mineral admixture is 5%, the test piece age is 28d, and the brittleness coefficient test and the freezing resistance test of the concrete are carried out.
Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure disclosed herein. This application is intended to cover any adaptations, uses, or adaptations of the disclosure following, in general, the principles of the disclosure and including such departures from the present disclosure as come within known or customary practice within the art to which the disclosure pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope of the disclosure being indicated by the following claims.
Claims (10)
1. A method for preparing a composite mineral admixture from water quenched converter slag is characterized by comprising the following steps: the raw materials comprise converter slag containing free calcium oxide accounting for more than or equal to 3 percent by weight, the total amount of calcium element accounting for 23 to 38 percent by weight and the total amount of iron element accounting for 8 to 28 percent by weight, and the process comprises the following steps:
s1, pouring high-temperature liquid converter slag and high-temperature liquid blast furnace slag containing molten iron into an electric furnace at the same time, adopting a graphite electrode heating mode of the electric furnace to provide heat, and enabling the two slag to be fused and combined at high temperature to obtain final slag and high-phosphorus iron which respectively flow out of a slag hole and a iron hole of the electric furnace, and recovering high-temperature flue gas;
s2, spraying water flow with a certain pressure to the high-temperature final slag, cooling the final slag suddenly, then burning the final slag to be red hot, spraying water flow to cool the final slag suddenly, and repeating the steps to generate amorphous glass bodies and microcrystals to obtain solidified slag, wherein the solidified slag is water quenched converter slag and granulated blast furnace slag;
s3, crushing and grinding the water-quenched converter slag, then placing the crushed and ground water-quenched converter slag into a sodium carbonate solution for stirring and dissolving, standing and settling, and filtering to obtain filtrate 1 and water-quenched converter slag filter residues, wherein the filtrate 1 is a sodium hydroxide solution, and heating and drying to obtain a sodium hydroxide solid;
S4, crushing and grinding water quenching converter slag, then placing the crushed and ground water quenching converter slag into a magnesium chloride solution for stirring and dissolving, standing and settling, and filtering to obtain filtrate 2 which is a calcium chloride solution;
s5, adding sodium sulfate into a calcium chloride solution for stirring and dissolving, standing and settling the reacted mixed solution, filtering to obtain a filtrate 3 and a precipitate 1, wherein the filtrate 3 is the sodium chloride solution, the precipitate 1 is calcium sulfate, the calcium sulfate and water are hydrated to generate calcium sulfate dihydrate, namely gypsum, and then the gypsum is dehydrated to obtain desulfurized gypsum with water content of about 10%;
s6, placing the obtained water quenching converter slag filter residues in a citric acid solution for stirring and dissolving reaction, standing, settling and filtering the mixed solution after the reaction to obtain filtrate 4 and a solid phase, wherein the solid phase comprises an upper layer precipitate 2 and a lower layer residue 1, and the component of the upper layer precipitate 2 is calcium citrate;
s7, heating the obtained filtrate 4 to perform hydrolysis reaction, hydrolyzing iron-containing compounds in the filtrate to generate ferric hydroxide, standing the reacted mixed solution for sedimentation, and filtering to obtain filtrate 5 and precipitate 3, wherein the precipitate 3 is ferric hydroxide, and the filtrate 5 can be recycled to replace citric acid solution for reuse;
s8, placing the lower layer residue 1 into water, adding sulfuric acid solution, stirring and dissolving for reaction, standing and settling the reacted mixed solution, and filtering to obtain filtrate 6 and final residue, wherein the final residue is a cement additive;
S9, adding citric acid into the filtrate 6, adding magnesium oxide, stirring to dissolve the magnesium oxide until the pH value is 4.5-6.4, and obtaining filtrate 7 and precipitate 4, wherein the filtrate 7 is a magnesium sulfate solution, and the precipitate 4 is ferric hydroxide;
s10, drying the water quenched converter slag precipitate obtained in the steps, grinding and warehousing after drying, respectively warehousing the granulated blast furnace slag, the desulfurized gypsum, the cement additive, the silica fume, the fly ash, the manganese alloy slag, the cement clinker and the limestone mining scraps, proportionally conveying the mixture into a grinding system, simultaneously adding a compound chemical strength excitant, grinding until the content of the screen residue of a 0.045mm sieve is less than or equal to 12%, and controlling the specific surface area to be 450-500m 2 Kg, obtaining an admixture;
s11, the admixture, the silica fume in the silica fume warehouse and the mineral powder in the mineral powder warehouse are metered by a metering device and conveyed to a homogenizing and mixing device for homogenizing and mixing treatment, so that the composite mineral admixture is formed.
2. The method for preparing the composite mineral admixture from the water quenched converter slag according to claim 1, wherein the method comprises the following steps of: the mass ratio of the high-temperature liquid converter slag to the high-temperature liquid blast furnace slag in the step S1 is 1: (3-6).
3. The method for preparing the composite mineral admixture from the water quenched converter slag according to claim 1, wherein the method comprises the following steps of: the temperature of the high-temperature liquid converter slag is 1350-1450 ℃.
4. The method for preparing the composite mineral admixture from the water quenched converter slag according to claim 1, wherein the method comprises the following steps of: and S3 and S4, crushing and grinding the water quenched converter slag to the diameter of 150 mu m.
5. The method for preparing the composite mineral admixture from the water quenched converter slag according to claim 1, wherein the method comprises the following steps of: all the materials put in the S3 to S9 are as follows in parts by weight:
water quenching converter slag: 30
Sodium carbonate: 2.43 to 2.71
Magnesium chloride: 7.54 to 9.60
Sodium sulfate: 9.43 to 11.14
Citric acid: 18.57 to 24.29
Sulfuric acid: 5.71 to 14.29
Magnesium oxide: 8.57 to 11.43.
6. The method for preparing the composite mineral admixture from the water quenched converter slag according to claim 1, wherein the method comprises the following steps of: in the step S10, all the materials put in are as follows in parts by weight:
water quenching converter slag: 12 to 18
Granulating blast furnace slag: 15 to 25
Desulfurization gypsum: 2 to 6
Cement additive: 0.1 to 0.5
Silica fume: 11 to 17
Fly ash: 9 to 15
Manganese alloy slag: 8 to 18
Cement clinker: 3 to 7
Limestone mining debris: 5 to 12
Composite chemical strength excitant: 1 to 2.
7. The method for preparing the composite mineral admixture from the water quenched converter slag according to claim 1, wherein the method comprises the following steps of: the upper layer sediment of the solid phase in the S6 is white in appearance, has higher density than the supernatant liquid and smaller than the lower layer residue, the lower layer residue is grey brown in appearance, the color difference is obvious, the upper layer sediment can be separated from the solid phase by a medicine spoon, and the junction part of the two layers is not separated and still remains in the lower layer residue.
8. The method for preparing the composite mineral admixture from the water quenched converter slag according to claim 1, wherein the method comprises the following steps of: the desulfurized gypsum contains CaSO 4 ·2H 2 O、CaCO 3 And SiO 2 。
9. The method for preparing the composite mineral admixture from the water quenched converter slag according to claim 1, wherein the method comprises the following steps of: the cement additive is a cement grinding aid, and the components of the cement additive contain triethyl amine trisulphonate.
10. The method for preparing the composite mineral admixture from the water quenched converter slag according to claim 1, wherein the method comprises the following steps of: the granulated blast furnace slag is a product of solid waste slag discharged in the iron-making process after water quenching, and the components of the granulated blast furnace slag contain aluminosilicate.
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