CN115806417A - Engineering muck curing agent and preparation method thereof - Google Patents
Engineering muck curing agent and preparation method thereof Download PDFInfo
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- CN115806417A CN115806417A CN202211459364.7A CN202211459364A CN115806417A CN 115806417 A CN115806417 A CN 115806417A CN 202211459364 A CN202211459364 A CN 202211459364A CN 115806417 A CN115806417 A CN 115806417A
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- 238000002360 preparation method Methods 0.000 title claims abstract description 10
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 125
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims abstract description 84
- 239000002893 slag Substances 0.000 claims abstract description 66
- 239000002689 soil Substances 0.000 claims abstract description 51
- 239000000843 powder Substances 0.000 claims abstract description 47
- 229910052602 gypsum Inorganic materials 0.000 claims abstract description 46
- 239000010440 gypsum Substances 0.000 claims abstract description 46
- 229910000019 calcium carbonate Inorganic materials 0.000 claims abstract description 42
- 239000002019 doping agent Substances 0.000 claims abstract description 40
- 239000006227 byproduct Substances 0.000 claims abstract description 31
- 239000011398 Portland cement Substances 0.000 claims abstract description 28
- 239000002994 raw material Substances 0.000 claims abstract description 22
- 239000002910 solid waste Substances 0.000 claims abstract description 22
- 239000002270 dispersing agent Substances 0.000 claims abstract description 16
- 239000013078 crystal Substances 0.000 claims abstract description 10
- 238000006243 chemical reaction Methods 0.000 claims abstract description 5
- 239000002956 ash Substances 0.000 claims description 29
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 29
- 238000002156 mixing Methods 0.000 claims description 18
- 239000010881 fly ash Substances 0.000 claims description 16
- 239000000463 material Substances 0.000 claims description 15
- PASHVRUKOFIRIK-UHFFFAOYSA-L calcium sulfate dihydrate Chemical compound O.O.[Ca+2].[O-]S([O-])(=O)=O PASHVRUKOFIRIK-UHFFFAOYSA-L 0.000 claims description 12
- MUBZPKHOEPUJKR-UHFFFAOYSA-N Oxalic acid Chemical compound OC(=O)C(O)=O MUBZPKHOEPUJKR-UHFFFAOYSA-N 0.000 claims description 9
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims description 8
- 238000007599 discharging Methods 0.000 claims description 8
- 238000003756 stirring Methods 0.000 claims description 8
- 238000005303 weighing Methods 0.000 claims description 8
- DBMJMQXJHONAFJ-UHFFFAOYSA-M Sodium laurylsulphate Chemical compound [Na+].CCCCCCCCCCCCOS([O-])(=O)=O DBMJMQXJHONAFJ-UHFFFAOYSA-M 0.000 claims description 7
- 229910000831 Steel Inorganic materials 0.000 claims description 7
- 229920005552 sodium lignosulfonate Polymers 0.000 claims description 7
- 239000010959 steel Substances 0.000 claims description 7
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 6
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Natural products OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 claims description 6
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 5
- 239000003546 flue gas Substances 0.000 claims description 5
- 229910052500 inorganic mineral Inorganic materials 0.000 claims description 5
- 239000011707 mineral Substances 0.000 claims description 5
- GBAOBIBJACZTNA-UHFFFAOYSA-L calcium sulfite Chemical compound [Ca+2].[O-]S([O-])=O GBAOBIBJACZTNA-UHFFFAOYSA-L 0.000 claims description 4
- 235000010261 calcium sulphite Nutrition 0.000 claims description 4
- 239000001569 carbon dioxide Substances 0.000 claims description 4
- 229910002092 carbon dioxide Inorganic materials 0.000 claims description 4
- 239000004570 mortar (masonry) Substances 0.000 claims description 4
- 239000002245 particle Substances 0.000 claims description 4
- LDMOEFOXLIZJOW-UHFFFAOYSA-N 1-dodecanesulfonic acid Chemical compound CCCCCCCCCCCCS(O)(=O)=O LDMOEFOXLIZJOW-UHFFFAOYSA-N 0.000 claims description 3
- PXRKCOCTEMYUEG-UHFFFAOYSA-N 5-aminoisoindole-1,3-dione Chemical compound NC1=CC=C2C(=O)NC(=O)C2=C1 PXRKCOCTEMYUEG-UHFFFAOYSA-N 0.000 claims description 3
- 229910021532 Calcite Inorganic materials 0.000 claims description 3
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims description 3
- 229920001732 Lignosulfonate Polymers 0.000 claims description 3
- 235000011941 Tilia x europaea Nutrition 0.000 claims description 3
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 3
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 claims description 3
- 239000000292 calcium oxide Substances 0.000 claims description 3
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims description 3
- 239000004571 lime Substances 0.000 claims description 3
- 239000011268 mixed slurry Substances 0.000 claims description 3
- 235000006408 oxalic acid Nutrition 0.000 claims description 3
- 229920000058 polyacrylate Polymers 0.000 claims description 3
- 238000007670 refining Methods 0.000 claims description 3
- 239000000377 silicon dioxide Substances 0.000 claims description 3
- 239000010936 titanium Substances 0.000 claims description 3
- 229910052719 titanium Inorganic materials 0.000 claims description 3
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 claims 1
- 239000011737 fluorine Substances 0.000 claims 1
- 229910052731 fluorine Inorganic materials 0.000 claims 1
- 229910001653 ettringite Inorganic materials 0.000 abstract description 8
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 abstract description 6
- 239000000411 inducer Substances 0.000 abstract description 5
- 229910004298 SiO 2 Inorganic materials 0.000 abstract description 4
- 238000006477 desulfuration reaction Methods 0.000 abstract description 4
- 230000023556 desulfurization Effects 0.000 abstract description 4
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 abstract description 3
- 238000012360 testing method Methods 0.000 description 24
- 238000000034 method Methods 0.000 description 10
- 239000004568 cement Substances 0.000 description 8
- 239000007788 liquid Substances 0.000 description 8
- 230000000087 stabilizing effect Effects 0.000 description 8
- 229910001385 heavy metal Inorganic materials 0.000 description 7
- 239000011230 binding agent Substances 0.000 description 6
- 238000005056 compaction Methods 0.000 description 6
- 238000002386 leaching Methods 0.000 description 6
- 239000000203 mixture Substances 0.000 description 6
- 239000008239 natural water Substances 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 5
- 239000000047 product Substances 0.000 description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 239000011575 calcium Substances 0.000 description 2
- 239000000701 coagulant Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000004848 polyfunctional curative Substances 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 230000001988 toxicity Effects 0.000 description 2
- 231100000419 toxicity Toxicity 0.000 description 2
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 1
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- 229910017518 Cu Zn Inorganic materials 0.000 description 1
- 241000196324 Embryophyta Species 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 241001232253 Xanthisma spinulosum Species 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 239000000378 calcium silicate Substances 0.000 description 1
- 229910052918 calcium silicate Inorganic materials 0.000 description 1
- OYACROKNLOSFPA-UHFFFAOYSA-N calcium;dioxido(oxo)silane Chemical compound [Ca+2].[O-][Si]([O-])=O OYACROKNLOSFPA-UHFFFAOYSA-N 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 239000010883 coal ash Substances 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 230000036571 hydration Effects 0.000 description 1
- 238000006703 hydration reaction Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 230000000979 retarding effect Effects 0.000 description 1
- 235000012239 silicon dioxide Nutrition 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 239000002699 waste material Substances 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
- 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
- Soil Conditioners And Soil-Stabilizing Materials (AREA)
Abstract
The invention discloses an engineering slag soil curing agent and a preparation method thereof, wherein the curing agent mainly takes portland cement, desulfurization ash, industrial by-product gypsum, slag powder, a dispersing agent, a calcium carbonate doping agent and the like as raw materials, and simultaneously improves the utilization level of solid waste resources such as engineering slag soil, desulfurization ash, industrial by-product gypsum, slag powder and the like by utilizing solid wastes such as engineering slag soil, desulfurization ash, industrial by-product gypsum, slag powder and the like on a large scale. Meanwhile, the industrial by-product gypsum is used as an excitant, the calcium carbonate dopant is used as a crystal form inducer, the alumina in the slag powder is used for accelerating the conversion of calcium sulfate in the desulfurized ash to ettringite, and finally the Al in the curing agent is used 2 O 3 、SiO 2 And the mechanical property of the engineering muck is improved by the components.
Description
Technical Field
The invention belongs to the field of solid waste recycling, particularly relates to an engineering muck curing agent prepared from solid waste such as desulfurized ash, industrial byproduct gypsum, slag powder and the like, and a preparation method thereof, and belongs to the technical field of research and development of engineering muck curing agents.
Background
The engineering slag soil is limited in resource utilization due to the characteristics of high water content, large performance difference and the like. In consideration of the physicochemical properties of the engineering muck, if the engineering muck can be applied to road subgrade and subbase, the problems of stacking, land occupation and the like of solid waste engineering muck can be solved, the resource utilization of solid waste can be promoted, and the method has remarkable social, economic and environmental benefits.
The engineering muck curing agent is a novel energy-saving environment-friendly engineering material which is formed by compounding inorganic curing agents and organic curing agents and is used for curing muck, free water of the traditional solid waste engineering muck can be converted into crystal water of ettringite, and the free water content of the engineering muck is reduced. Under the alkaline excitation, the engineering muck curing agent can generate calcium silicate hydrate, so that the structural connection among soil particles is enhanced, and the cured muck is easier to compact and stabilize, thereby forming an integral structure. The curing agent used in the present engineering is mainly cement, and although the soil stabilizing performance is good, the energy consumption of cement production is high, and a large amount of carbon dioxide is released, so that the greenhouse effect is intensified.
At present, the following problems still need to be considered in the preparation of engineering muck curing agent by utilizing multi-source solid wastes: (1) Raw materials and raw material proportion for preparing the engineering muck curing agent; (2) Whether the engineering muck curing agent can meet the related performance requirements of DG/T J08-2082-2017 GS soil mass hardening agent application technical specification; (3) Whether the engineering muck curing agent stabilized soil can meet the relevant performance requirements of JTG/TF20-2015 detailed rules for highway base course construction technology or not.
In view of the above circumstances, there is a need to develop an engineering muck curing agent prepared from multi-source solid wastes and a preparation method thereof, so as to improve the resource utilization level of the solid wastes such as engineering muck, desulfurized ash, industrial byproduct gypsum, slag powder and the like while achieving the purposes of reducing resource consumption and production cost.
Disclosure of Invention
In view of the above-mentioned defects in the prior art, according to an aspect of the present invention, one of the main objects of the present invention is to develop an engineering muck curing agent, which mainly uses portland cement, desulfurized ash, industrial by-product gypsum, slag powder, a dispersant, a calcium carbonate dopant, etc. as raw materials, and simultaneously, by utilizing solid wastes such as engineering muck, desulfurized ash, industrial by-product gypsum, slag powder, etc. in a large scale, the utilization level of solid wastes such as engineering muck, desulfurized ash, industrial by-product gypsum, slag powder, etc. is improved. Meanwhile, the industrial by-product gypsum is used as an excitant, the calcium carbonate dopant is used as a crystal form inducer, the alumina in the slag powder is used for accelerating the conversion of calcium sulfate in the desulfurized ash to ettringite, and finally the Al in the curing agent is used 2 O 3 、SiO 2 And the mechanical property of the engineering muck is improved by the components.
The invention also aims to provide the preparation method of the engineering muck curing agent, which is used for preparing the engineering muck curing agent meeting the related performance requirements of DG/T J08-2082-2017 'GS soil body hardening agent application technical specification' by selecting the raw materials and the proportion of the engineering muck curing agent, so that the production cost is reduced, and the resource utilization of solid wastes is further promoted.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention provides an engineering muck curing agent, which comprises the following main components in parts by weight: portland cement: 15-30 parts of desulfurized fly ash: 20-30 parts, industrial by-product gypsum: 15-30 parts of slag powder: 30-50 parts of dispersant: 0.5-1.5 parts of calcium carbonate dopant: 0.01 to 30 portions.
According to a preferable technical scheme, the engineering muck curing agent comprises the following main components in parts by weight: portland cement: 20-30 parts of desulfurized fly ash: 20-30 parts, industrial by-product gypsum: 15-30 parts of slag powder: 35-45 parts of dispersant: 0.5-1.0 part, calcium carbonate dopant: 0.01 to 20 portions.
According to a preferable technical scheme, the engineering muck curing agent comprises the following main components in parts by weight: 200 parts of Portland cement; 250 parts of desulfurized fly ash; 150 parts of desulfurized gypsum; 350 parts of slag powder; 5 parts of sodium lignosulphonate; and 45 parts of calcium carbonate doping agent.
According to a preferable technical scheme, the engineering muck curing agent comprises the following main components in parts by weight: 200 parts of Portland cement; 250 parts of desulfurized fly ash; 120 parts of phosphogypsum; 30 parts of fluorgypsum; 300 parts of slag powder; 6 parts of sodium dodecyl sulfate; 94 parts of calcium carbonate doping agent.
According to a preferable technical scheme, the engineering muck curing agent comprises the following main components in parts by weight: 250 parts of Portland cement; 200 parts of desulfurized ash; 100 parts of desulfurized gypsum; 50 parts of phosphogypsum; 350 parts of slag powder; 6 parts of sodium lignosulphonate; and 44 parts of calcium carbonate doping agent.
According to a preferable technical scheme, the engineering muck curing agent comprises the following main components in parts by weight: 200 parts of Portland cement; 200 parts of desulfurized ash; 150 parts of fluorgypsum; 350 parts of slag powder; 6 parts of sodium dodecyl sulfate; 94 parts of calcium carbonate doping agent.
Preferably, the desulfurized ash comprises calcium sulfite hemihydrate: 30-70%, calcium carbonate: 5-15%, silica: 1% -5%, free calcium oxide: 0 to 1.5 percent.
Preferably, the industrial byproduct gypsum comprises one or more of desulfurized gypsum, phosphogypsum, titanium gypsum and fluorgypsum, the purity is more than 80%, the water content is less than 5%, and the pH value is 5-12.
Preferably, the slag powder is S95 mineral powder with the density of 2.8-2.9 g/cm 3 The specific surface area is 400-500 m 2 /g。
Preferably, the dispersant is one or more of lignosulfonate, dodecyl sulfonate and polyacrylate.
Preferably, the calcium carbonate doping agent is prepared by continuously adding carbon dioxide (50-98% by volume) collected from flue gas of a power plant, flue gas of a blast furnace, a converter, a refining furnace, a lime kiln furnace and the like of an iron and steel plant into mixed slurry of solid waste such as steel slag, fly ash and the like, oxalic acid/citric acid and water under a certain pressure (< 100 bar) for reaction; the calcium carbonate doping agent is obtained by processes such as a multi-stage solid-liquid separation device and an impurity removal device (pH is regulated by adopting modes of doping 1% of coagulant, compressing air, heating and the like), wherein the crystal form is calcite, and the particle size is 0.1-5.0 um.
The initial setting time of the engineering muck curing agent is 2-15 h, the final setting time is 5-20 h, the compressive strength of 7d of the mortar is 20-35 MPa, and the compressive strength of 28d of the mortar is 35-55 MPa, so that the performance requirements of DG/T J08-2082-2017 'GS soil body hardener application technical specification' are met.
According to another aspect of the invention, another object of the invention is to provide a preparation method of the engineering muck curing agent, which comprises the following steps:
(1) Engineering muck curing agent batching: weighing raw material components of portland cement, desulfurized ash, industrial byproduct gypsum, slag powder, a dispersing agent and a calcium carbonate doping agent according to the weight part ratio;
(2) Preparing an engineering muck curing agent: and (2) sequentially adding the portland cement, the desulfurized ash, the industrial byproduct gypsum, the slag powder, the dispersing agent and the calcium carbonate doping agent weighed in the step (1) into a stirrer according to the feeding sequence, stirring for 2-5 min at the preferred temperature of 22-28 ℃, uniformly mixing, and discharging to obtain the engineering slag soil curing agent.
According to a third aspect of the invention, the invention also aims to provide application of the engineering muck curing agent in preparation of road foundations and sub-base layers.
Preferably, in the application of the engineering muck curing agent in preparing the road subgrade and the subbase layer, the engineering muck curing agent is added into the base materials of the road subgrade and the subbase layer according to the doping amount of 4-12% by mass percent and uniformly mixed to obtain the stabilized soil for the road subgrade and the subbase layer.
Compared with the prior art, the invention has the beneficial effects that:
(1) The engineering muck curing agent meeting the related performance requirements of DG/T J08-2082-2017 GS soil body hardening agent application technical specification is prepared by selecting the components of the engineering muck curing agent, adopting portland cement, desulfurized ash, industrial by-product gypsum, slag powder, a dispersing agent and a calcium carbonate doping agent and adjusting the formula. The aims of reducing resource consumption and production cost are fulfilled, and the resource utilization level of solid wastes such as engineering slag soil, desulfurized ash, industrial byproduct gypsum, slag powder and the like is improved.
(2) The engineering slag soil curing agent is added with slag soil, the grading can be adjusted so as to increase the compactness, the industrial by-product gypsum is used as an excitant, the calcium carbonate dopant is used as a crystal form inducer, and Al in the curing agent 2 O 3 、SiO 2 And Ca (OH) 2 The components react to generate C-S-H and ettringite, and the strength of the engineering muck curing agent stabilized soil is improved.
Detailed Description
Hereinafter, the present invention will be described in detail. Before the description is made, it should be understood that the terms used in the present specification and the appended claims should not be construed as limited to general and dictionary meanings, but interpreted based on the meanings and concepts corresponding to technical aspects of the present invention on the basis of the principle that the inventor is allowed to define terms appropriately for the best explanation. Accordingly, the description proposed herein is just a preferable example for the purpose of illustrations only, not intended to limit the scope of the invention, so it should be understood that other equivalents and modifications could be made thereto without departing from the spirit and scope of the invention.
As used herein, the terms "comprising," "including," "having," "containing," or any other similar term, are intended to be open-ended translational phrase and are intended to cover non-exclusive inclusions. For example, a composition or article comprising a plurality of elements is not limited to only those elements recited herein, but may include other elements not expressly listed or inherent to such composition or article. In addition, unless explicitly stated to the contrary, the term "or" is intended to mean an inclusive "or" rather than an exclusive "or". For example, the condition "a or B" is satisfied in any of the following cases: a is true (or present) and B is false (or not present), a is false (or not present) and B is true (or present), both a and B are true (or present). Moreover, in this document, the terms "comprising," including, "" having, "" containing, "and" containing "are to be construed as specifically disclosed and also encompass the conjunctions whether closed or semi-closed" consisting of and consisting essentially of 823030309.
All features or conditions defined herein as numerical ranges or percentage ranges are for brevity and convenience only. Accordingly, the description of numerical ranges or percentage ranges should be considered to have covered and specifically disclosed all possible subranges and individual numerical values within the ranges, particularly integer numerical values. For example, a description of a range of "1 to 8" should be considered to have specifically disclosed all subranges such as 1 to 7, 2 to 8, 2 to 6, 3 to 6, 4 to 8, 3 to 8, and so on, particularly subranges bounded by all integer values, and to have specifically disclosed individual values within that range such as 1, 2, 3, 4, 5, 6, 7, 8, and so on. Unless otherwise indicated, the foregoing explanatory methods apply to all matters throughout the present invention, whether broad or not.
If an amount or other value or parameter is expressed as a range, preferred range, or a list of upper and lower limits, it is to be understood that all ranges subsumed therein for any pair of that range's upper or preferred value and that range's lower or preferred value, whether or not such ranges are separately disclosed, are specifically disclosed herein. Further, when a range of numerical values is recited herein, unless otherwise stated, the range is intended to include the endpoints thereof, and all integers and fractions within the range.
The following examples are given by way of illustration of embodiments of the invention and are not to be construed as limiting the invention, and it will be understood by those skilled in the art that modifications may be made without departing from the spirit and scope of the invention.
The raw materials adopted in the following examples include portland cement, desulfurized ash, industrial by-product gypsum, slag powder, a dispersant, a calcium carbonate dopant, and the like; wherein the desulfurized fly ash comprises calcium sulfite hemihydrate: 30-70%, calcium carbonate dopant: 5% -15%, silicon dioxide: 1% -5%, free calcium oxide: 0-1.5%; the industrial byproduct gypsum is one or more of desulfurized gypsum, phosphogypsum, titanium gypsum and fluorgypsum; the slag powder is S95 mineral powder with the density of 2.8-2.9 g/cm 3 The specific surface area is 400-500 m 2 (ii)/g; the dispersant is one or more of lignosulfonate, dodecyl sulfonate and polyacrylate. Unless otherwise indicated, reagents and equipment used were commercially available products. For example, portland cement is southern p.o 42.5 cement; the desulfurized ash is sintered desulfurized ash of steel in the jaw; the industrial byproduct gypsum is desulfurized gypsum: holy gobain desulfurized building gypsum; phosphogypsum: guizhou phosphogypsum; slag powder: bao Steel S95 mineral powder.
The calcium carbonate doping agent is prepared by continuously adding carbon dioxide (volume percentage content is 50-98%) which is used for capturing flue gas of a power plant, flue gas of a blast furnace, a converter, a refining furnace and a lime kiln of a steel and iron plant, tail gas of coal chemical industry or tail gas of petrochemical industry into mixed slurry of solid waste such as steel slag, coal ash and the like, oxalic acid/citric acid and water under certain pressure (less than 100 bar) for reaction; the calcium carbonate doping agent is obtained by processes such as a multi-stage solid-liquid separation device and an impurity removal device (pH is regulated by adopting modes of doping 1% of coagulant, compressing air, heating and the like), wherein the crystal form is calcite, and the particle size is 0.1-5.0 um. For example, the calcium carbonate dopant used in the present invention is supplied by the Shanghai Ministry laboratories.
The performance test of the engineering muck curing agent in the following examples is carried out by the following steps:
(1) Pretreating engineering muck;
(2) Raw materials are proportioned according to components of the engineering muck curing agent;
(3) Adding the engineering muck curing agent into aged muck, wherein the mixing amount is 4-12 wt%, and uniformly mixing;
(4) Obtaining the optimal water content and the maximum dry density through a compaction test;
(5) And carrying out an unconfined compressive strength test according to the test results of the optimal water content and the maximum dry density.
Example 1
The engineering muck curing agent of the embodiment is prepared by the following method:
(1) Pretreatment of engineering muck: the engineering muck is low liquid limit silt, the natural water content is 30 percent, and the water content of the engineering muck is controlled to be lower than 10 percent by adopting airing treatment.
(2) Preparing materials: weighing raw materials according to the components of the engineering muck curing agent, wherein the raw materials are weighed according to 1000 parts by weight of the engineering muck curing agent:
(3) Preparing an engineering muck curing agent: and (3) sequentially adding the Portland cement, the desulfurized ash, the desulfurized gypsum, the slag powder, the sodium lignosulfonate and the calcium carbonate dopant weighed in the step (2) into a stirrer according to the feeding sequence, stirring for 3-5 min, uniformly mixing, and discharging to obtain the engineering slag soil curing agent.
(4) Preparing the stabilized soil of the road subgrade and the subbase layer: according to the standard test regulation for inorganic binder stabilizing materials for highway engineering (JTG E51-2009), the engineering muck curing agent is added into aged muck, the mixing amount is 5 wt%, and the mixture is uniformly mixed. Obtaining the optimum water content and the maximum dry density by a compaction test (according to standard test specification for inorganic binder stabilizing materials for road engineering (JTG E51-2009)); according to the test results of the optimal water content and the maximum dry density, the unconfined compressive strength test is carried out, and the leaching performances of the engineering muck curing agent, the engineering muck curing agent stabilized soil and the heavy metal in the embodiment are respectively shown in tables 1, 2 and 3.
Example 2
The engineering muck curing agent of the embodiment is prepared by the following method:
(1) Pretreatment of engineering muck: the engineering muck is low liquid limit silt, the natural water content is 30 percent, and the water content of the engineering muck is controlled to be lower than 10 percent by adopting airing treatment.
(2) Preparing materials: weighing raw materials according to the components of the engineering muck curing agent, wherein the raw materials are weighed according to the weight parts in 1000 parts of the engineering muck curing agent:
(3) Preparing an engineering muck curing agent: and (3) sequentially adding the portland cement, the desulfurized fly ash, the phosphogypsum, the fluorgypsum, the slag powder, the sodium dodecyl sulfate and the calcium carbonate dopant weighed in the step (2) into a stirrer according to the feeding sequence, stirring for 3-5 min, uniformly mixing, and discharging to obtain the engineering slag soil curing agent.
(4) Preparing the stabilized soil of the road subgrade and the subbase layer: adding the engineering muck curing agent into aged muck, wherein the mixing amount is 5 wt%, and uniformly mixing. Obtaining the optimal water content and the maximum dry density through a compaction test (refer to standard inorganic binder stabilizing materials test protocol for highway engineering (JTG E51-2009)); according to the test results of the optimal water content and the maximum dry density, the unconfined compressive strength test is carried out, and the leaching performances of the engineering muck curing agent, the engineering muck curing agent stabilized soil and the heavy metal in the embodiment are respectively shown in tables 1, 2 and 3.
Example 3
The engineering muck curing agent of the embodiment is prepared by the following method:
(1) Pretreatment of engineering muck: the engineering muck is low liquid limit silt, the natural water content is 30 percent, and the water content of the engineering muck is controlled to be lower than 10 percent by adopting airing treatment.
(2) Preparing materials: weighing raw materials according to the components of the engineering muck curing agent, wherein the raw materials are weighed according to 1000 parts by weight of the engineering muck curing agent:
(3) Preparing an engineering muck curing agent: and (3) sequentially adding the portland cement, the desulfurized ash, the desulfurized gypsum, the phosphogypsum, the slag powder, the sodium lignosulfonate and the calcium carbonate doping agent weighed in the step (2) into a stirrer according to the feeding sequence, stirring for 3-5 min, uniformly mixing, and discharging to obtain the engineering slag soil curing agent.
(4) Preparing the stabilized soil of the road subgrade and the subbase layer: according to the standard test regulation for inorganic binder stabilizing materials for highway engineering (JTG E51-2009), the engineering muck curing agent is added into aged muck, the mixing amount is 5 wt%, and the mixture is uniformly mixed. Obtaining the optimal water content and the maximum dry density through a compaction test; according to the test results of the optimal water content and the maximum dry density, the unconfined compressive strength test is carried out, and the leaching performances of the engineering muck curing agent, the engineering muck curing agent stabilized soil and the heavy metal in the embodiment are respectively shown in tables 1, 2 and 3.
Example 4
The engineering muck curing agent of the embodiment is prepared by the following method:
(1) Pretreatment of engineering muck: the engineering muck is low liquid limit silt, the natural water content is 30 percent, and the water content of the engineering muck is controlled to be lower than 10 percent by adopting airing treatment.
(2) Preparing materials: weighing raw materials according to the components of the engineering muck curing agent, wherein the raw materials are weighed according to the weight parts in 1000 parts of the engineering muck curing agent:
(3) Preparing an engineering muck curing agent: and (3) sequentially adding the Portland cement, the desulfurized fly ash, the fluorgypsum, the phosphogypsum, the slag powder, the sodium lignosulfonate and the calcium carbonate dopant weighed in the step (2) into a stirrer according to the feeding sequence, stirring for 3-5 min, uniformly mixing, and discharging to obtain the engineering slag soil curing agent.
(4) Preparing the stabilized soil of the road subgrade and the subbase layer: according to the standard test regulation for inorganic binder stabilizing materials for highway engineering (JTG E51-2009), the engineering muck curing agent is added into aged muck, the mixing amount is 5 wt%, and the mixture is uniformly mixed. Obtaining the optimal water content and the maximum dry density through a compaction test; according to the test results of the optimal water content and the maximum dry density, the unconfined compressive strength test is carried out, and the leaching performances of the engineering muck curing agent, the engineering muck curing agent stabilized soil and the heavy metal in the embodiment are respectively shown in tables 1, 2 and 3.
Example 5
The engineering muck curing agent of the embodiment is prepared by the following method:
(1) Pretreatment of engineering muck: the engineering muck is low liquid limit silt, the natural water content is 30 percent, and the water content of the engineering muck is controlled to be lower than 10 percent by adopting airing treatment.
(2) Preparing materials: weighing raw materials according to the components of the engineering muck curing agent, wherein the raw materials are weighed according to 1000 parts by weight of the engineering muck curing agent:
(3) Preparing an engineering muck curing agent: and (3) sequentially adding the Portland cement, the desulfurized ash, the fluorgypsum, the slag powder, the sodium dodecyl sulfate and the calcium carbonate dopant weighed in the step (2) into a stirrer according to the feeding sequence, stirring for 3-5 min, uniformly mixing, and discharging to obtain the engineering slag soil curing agent.
(4) Preparing the stabilized soil of the road subgrade and the subbase layer: according to the standard test regulation for inorganic binder stabilizing materials for highway engineering (JTG E51-2009), the engineering muck curing agent is added into aged muck, the mixing amount is 5 wt%, and the mixture is uniformly mixed. Obtaining the optimal water content and the maximum dry density through a compaction test; according to the test results of the optimal water content and the maximum dry density, the unconfined compressive strength test is carried out, and the leaching performances of the engineering muck curing agent, the engineering muck curing agent stabilized soil and the heavy metal in the embodiment are respectively shown in tables 1, 2 and 3.
Example 6
The engineering muck curing agent of the embodiment is prepared by the following method:
(1) Pretreatment of engineering muck: the engineering muck is low liquid limit silt, the natural water content is 30 percent, and the water content of the engineering muck is controlled to be lower than 10 percent by adopting airing treatment.
(2) Preparing materials: weighing raw materials according to the components of the engineering muck curing agent, wherein the raw materials are weighed according to the weight parts in 1000 parts of the engineering muck curing agent:
(3) Preparing an engineering muck curing agent: and (3) sequentially adding the Portland cement, the desulfurized ash, the slag powder and the sodium dodecyl sulfate which are weighed in the step (2) into a stirrer according to the feeding sequence, stirring for 3-5 min, uniformly mixing, and discharging to obtain the engineering slag soil curing agent.
The properties of the engineering muck curing agent in this example are shown in table 1.
Table 1: performance of engineering dregs curing agent
As can be seen from the data in Table 1, the engineering muck curing agent provided by the invention meets the performance requirements of DG/T J08-2082-2017 'GS soil mass hardening agent application technical specification'. Example 6 the curing agent raw material content is out of the range of the present invention, and the final setting time thereof>15h,7d compressive strength<17MPa, and does not meet the performance requirements of DG/T J08-2082-2017 standard of GS soil mass hardener application technical specification. The desulfurized ash reacts with mineral components of the cement to generate products such as ettringite and the like, and the products have the function of retarding the cement; the calcium sulfite hemihydrate content in the desulfurized fly ash is higher, and the dissolution rate is low, so that the desulfurized fly ash and C in cement are reduced 3 A、C 4 The action time of AF and the like is delayed, and monosulfur hydrated calcium sulphoaluminate (AFm), hydrocalumite and the like are generated, and the slow setting effect is realized.
Table 2: engineering muck curing agent for stabilizing soil performance
| 7d unconfined compressive strength/MPa | 28d unconfined compressive strength/MPa | |
| Example 1 | 1.8 | 3.0 |
| Example 2 | 1.6 | 2.8 |
| Example 3 | 2.1 | 3.3 |
| Example 4 | 1.7 | 2.9 |
| Example 5 | 1.6 | 1.7 |
| Comparison group | 1.3 | 2.1 |
Note: the control group was stabilized soil doped with 5% cement.
Table 3: toxicity of heavy metal leachate of stabilized soil
| Leaching concentration/mg/L of sample | Cd | Cr | Ni | Pb | Cu | Zn | As | Hg |
| Comparison group | <0.01 | <0.02 | <0.02 | <0.03 | 0.02 | <0.01 | <0.0001 | 0 |
| Case 1 | <0.01 | <0.02 | <0.02 | <0.03 | 0.04 | <0.01 | <0.0001 | 0.00049 |
| Case 2 | <0.01 | <0.02 | <0.02 | <0.03 | 0.03 | <0.01 | <0.0001 | 0.00041 |
| Case 3 | <0.01 | <0.02 | <0.02 | <0.03 | 0.03 | <0.01 | <0.0001 | 0.00041 |
| Case 4 | 0.02 | 0.01 | <0.02 | 0.043 | 0.04 | 0.02 | 0.00127 | 0.00075 |
| Case 5 | 0.01 | 0.01 | <0.02 | 0.047 | 0.06 | 0.02 | 0.00183 | 0.00086 |
| CECS 397-2015 | - | ≤0.1 | ≤1.5 | - | ≤2 | - | - | ≤0.6 |
As can be seen from Table 2, the unconfined compressive strength of the firming agent stabilized soil 7d and 28d is improved, which shows that the multisource solid waste has synergistic effect, and the multisource solid waste firming agent system is superior to a pure cement system under the condition of the same mixing amount.
The industrial by-product gypsum is used as an excitant, the calcium carbonate dopant is used as a crystal form inducer and can excite active SiO in the muck curing agent 2 And active Al 2 O 3 C-S-H and C-A-H gel are generated, and can also react with C-A-H to generate ettringite, so that the gel strength is improved; the multi-source solid waste curing agent stabilized soil gel system can generate ettringite, free water in the residue soil is converted into crystal water, and hydration products are continuously generated, so that the unconfined compressive strength of the stabilized soil can be improved.
As can be seen from Table 3, the toxicity of the heavy metal leachate of the engineering muck curing agent stabilized soil meets the standard requirements.
In combination with examples 1 to 5, the present invention was made by consolidating engineering waste soilThe components of the curing agent are selected, portland cement, desulfurized ash, industrial byproduct gypsum, slag powder, a dispersing agent and a calcium carbonate doping agent are adopted, and the engineering slag soil curing agent meeting the related performance requirements of DG/T J08-2082-2017 GS soil hardening agent application technical specification is prepared by adjusting the formula of the engineering slag soil curing agent, so that the production cost of the engineering slag soil curing agent can be reduced, and the resource utilization level of solid wastes such as engineering slag soil, desulfurized ash, industrial byproduct gypsum, slag powder and the like is improved by utilizing the solid wastes such as the engineering slag soil, the desulfurized ash, the industrial byproduct gypsum, the slag powder and the like in a large scale; the industrial by-product gypsum is used as an excitant, the calcium carbonate dopant is used as a crystal form inducer, the alumina in the slag powder is used for accelerating the transformation of the calcium sulfate in the desulfurization ash to the ettringite, and finally the Al in the curing agent is used 2 O 3 、SiO 2 The components improve the mechanical property of the engineering muck.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and the present invention shall be covered thereby. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (8)
1. The engineering muck curing agent comprises the following main components in parts by weight: portland cement: 15-30 parts of desulfurized fly ash: 20-30 parts, industrial by-product gypsum: 15-30 parts of slag powder: 30-50 parts of dispersant: 0.5-1.5 parts of calcium carbonate dopant: 0.01 to 30 portions.
2. The engineering muck curing agent of claim 1, which comprises the following main components in parts by weight: portland cement: 20-30 parts of desulfurized fly ash: 20-30 parts, industrial by-product gypsum: 15-30 parts of slag powder: 35-45 parts of dispersant: 0.5-1.0 part of calcium carbonate dopant: 0.01 to 20 portions.
3. The engineering muck curing agent of claim 1, wherein the engineering muck curing agent comprises the following main components in parts by weight: 200 parts of Portland cement; 250 parts of desulfurized fly ash; 150 parts of desulfurized gypsum; 350 parts of slag powder; 5 parts of sodium lignosulphonate; 45 parts of calcium carbonate doping agent; or
The engineering muck curing agent comprises the following main components in parts by weight: 200 parts of Portland cement; 250 parts of desulfurized fly ash; 120 parts of phosphogypsum; 30 parts of fluorgypsum; 300 parts of slag powder; 6 parts of sodium dodecyl sulfate; 94 parts of calcium carbonate doping agent; or alternatively
The engineering muck curing agent comprises the following main components in parts by weight: 250 parts of Portland cement; 200 parts of desulfurized fly ash; 100 parts of desulfurized gypsum; 50 parts of phosphogypsum; 350 parts of slag powder; 6 parts of sodium lignosulphonate; 44 parts of calcium carbonate doping agent; or alternatively
The engineering muck curing agent comprises the following main components in parts by weight: 200 parts of Portland cement; 200 parts of desulfurized ash; 150 parts of fluorgypsum; 350 parts of slag powder; 6 parts of sodium dodecyl sulfate; 94 parts of calcium carbonate doping agent.
4. The engineering muck curing agent according to any one of claims 1 to 3, wherein the desulfurized ash comprises, in terms of mass percent, calcium sulfite hemihydrate: 30-70%, calcium carbonate: 5 to 15%, silica: 1% -5%, free calcium oxide: 0 to 1.5 percent;
preferably, the industrial byproduct gypsum comprises one or more of desulfurized gypsum, phosphogypsum, titanium gypsum and fluorine gypsum, the purity is more than 80%, the water content is less than 5%, and the pH value is 5-12;
preferably, the slag powder is S95 mineral powder with the density of 2.8-2.9 g/cm 3 The specific surface area is 400-500 m 2 /g；
Preferably, the dispersant is one or more of lignosulfonate, dodecyl sulfonate and polyacrylate;
preferably, the calcium carbonate dopant is obtained by continuously adding carbon dioxide (50-98% by volume percentage) in flue gas of a capture power plant, blast furnace, converter, refining furnace and lime kiln under a certain pressure (less than 100 bar) into mixed slurry of steel slag, solid waste of fly ash, oxalic acid/citric acid and water for reaction, wherein the crystal form of the calcium carbonate dopant is calcite, and the particle size of the calcium carbonate dopant is 0.1-5.0 um.
5. The engineering muck curing agent as claimed in any one of claims 1 to 3, wherein the initial setting time of the engineering muck curing agent is 2 to 15 hours, the final setting time is 5 to 20 hours, the 7d compressive strength of the mortar is 20 to 35MPa, and the 28d compressive strength of the mortar is 35 to 55MPa.
6. The preparation method of the engineering muck curing agent according to any one of claims 1 to 5, comprising the following steps:
(1) Engineering muck curing agent batching: weighing raw material components of portland cement, desulfurized ash, industrial byproduct gypsum, slag powder, a dispersing agent and a calcium carbonate doping agent according to the weight part ratio;
(2) Preparing an engineering muck curing agent: and (2) sequentially adding the portland cement, the desulfurized ash, the industrial byproduct gypsum, the slag powder, the dispersing agent and the calcium carbonate doping agent weighed in the step (1) into a stirrer according to the feeding sequence, stirring for 2-5 min at the preferred temperature of 22-28 ℃, uniformly mixing, and discharging to obtain the engineering slag soil curing agent.
7. Use of the engineering muck curing agent according to any one of claims 1 to 5 for preparing roadbed and subbase of road.
8. The use of the engineering dregs curing agent in preparing roadbed and subbase of road as claimed in claim 7, wherein said engineering dregs curing agent is added into the base material of said roadbed and subbase according to the mixing amount of 4% -12% by mass, and uniformly mixed to obtain the stabilized soil for roadbed and subbase of road.
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