CN113213786A - Modified gangue-based coal mine filling cementing material - Google Patents
Modified gangue-based coal mine filling cementing material Download PDFInfo
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- CN113213786A CN113213786A CN202110397061.6A CN202110397061A CN113213786A CN 113213786 A CN113213786 A CN 113213786A CN 202110397061 A CN202110397061 A CN 202110397061A CN 113213786 A CN113213786 A CN 113213786A
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- 239000000463 material Substances 0.000 title claims abstract description 59
- 238000011049 filling Methods 0.000 title claims abstract description 49
- 239000003245 coal Substances 0.000 title claims abstract description 32
- 239000000843 powder Substances 0.000 claims abstract description 62
- 239000002893 slag Substances 0.000 claims abstract description 39
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 38
- 239000010959 steel Substances 0.000 claims abstract description 38
- 229910052602 gypsum Inorganic materials 0.000 claims abstract description 28
- 239000010440 gypsum Substances 0.000 claims abstract description 28
- 238000000227 grinding Methods 0.000 claims abstract description 20
- 239000010881 fly ash Substances 0.000 claims abstract description 18
- 239000002994 raw material Substances 0.000 claims abstract description 18
- 238000006477 desulfuration reaction Methods 0.000 claims description 2
- 230000023556 desulfurization Effects 0.000 claims description 2
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 claims 1
- 229910052731 fluorine Inorganic materials 0.000 claims 1
- 239000011737 fluorine Substances 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 8
- 238000002156 mixing Methods 0.000 abstract description 8
- 238000005265 energy consumption Methods 0.000 abstract description 5
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 230000004048 modification Effects 0.000 abstract description 3
- 238000012986 modification Methods 0.000 abstract description 3
- 239000002910 solid waste Substances 0.000 abstract description 3
- -1 alcohol amine Chemical class 0.000 abstract description 2
- 238000000034 method Methods 0.000 description 16
- 230000008569 process Effects 0.000 description 15
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 14
- AMWRITDGCCNYAT-UHFFFAOYSA-L hydroxy(oxo)manganese;manganese Chemical compound [Mn].O[Mn]=O.O[Mn]=O AMWRITDGCCNYAT-UHFFFAOYSA-L 0.000 description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 11
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 9
- 239000004568 cement Substances 0.000 description 9
- 239000002245 particle Substances 0.000 description 9
- 238000006243 chemical reaction Methods 0.000 description 8
- 239000002002 slurry Substances 0.000 description 8
- 229910052742 iron Inorganic materials 0.000 description 7
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 6
- 229910000805 Pig iron Inorganic materials 0.000 description 6
- 238000003723 Smelting Methods 0.000 description 6
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 6
- 239000006227 byproduct Substances 0.000 description 6
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 description 6
- 239000000292 calcium oxide Substances 0.000 description 6
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 6
- 239000012535 impurity Substances 0.000 description 6
- 239000000395 magnesium oxide Substances 0.000 description 6
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 6
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 description 6
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 description 6
- 230000001590 oxidative effect Effects 0.000 description 6
- 239000011574 phosphorus Substances 0.000 description 6
- 229910052698 phosphorus Inorganic materials 0.000 description 6
- 150000003839 salts Chemical class 0.000 description 6
- 239000010703 silicon Substances 0.000 description 6
- 229910052710 silicon Inorganic materials 0.000 description 6
- 239000002904 solvent Substances 0.000 description 6
- 238000009628 steelmaking Methods 0.000 description 6
- 239000011593 sulfur Substances 0.000 description 6
- 229910052717 sulfur Inorganic materials 0.000 description 6
- 239000013078 crystal Substances 0.000 description 5
- 230000005284 excitation Effects 0.000 description 5
- 230000036571 hydration Effects 0.000 description 5
- 238000006703 hydration reaction Methods 0.000 description 5
- 239000000126 substance Substances 0.000 description 5
- 239000002699 waste material Substances 0.000 description 5
- 239000003795 chemical substances by application Substances 0.000 description 4
- 239000011398 Portland cement Substances 0.000 description 3
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 3
- 229910052681 coesite Inorganic materials 0.000 description 3
- 229910052906 cristobalite Inorganic materials 0.000 description 3
- 230000007547 defect Effects 0.000 description 3
- 239000004571 lime Substances 0.000 description 3
- 239000000377 silicon dioxide Substances 0.000 description 3
- 235000012239 silicon dioxide Nutrition 0.000 description 3
- 239000007787 solid Substances 0.000 description 3
- 229910052682 stishovite Inorganic materials 0.000 description 3
- 229910052905 tridymite Inorganic materials 0.000 description 3
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 2
- 235000011941 Tilia x europaea Nutrition 0.000 description 2
- 229910001570 bauxite Inorganic materials 0.000 description 2
- 239000011575 calcium Substances 0.000 description 2
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 2
- 239000000920 calcium hydroxide Substances 0.000 description 2
- 229910001861 calcium hydroxide Inorganic materials 0.000 description 2
- 235000011116 calcium hydroxide Nutrition 0.000 description 2
- 239000000378 calcium silicate Substances 0.000 description 2
- 229910052918 calcium silicate Inorganic materials 0.000 description 2
- OYACROKNLOSFPA-UHFFFAOYSA-N calcium;dioxido(oxo)silane Chemical compound [Ca+2].[O-][Si]([O-])=O OYACROKNLOSFPA-UHFFFAOYSA-N 0.000 description 2
- XFWJKVMFIVXPKK-UHFFFAOYSA-N calcium;oxido(oxo)alumane Chemical compound [Ca+2].[O-][Al]=O.[O-][Al]=O XFWJKVMFIVXPKK-UHFFFAOYSA-N 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 229910052593 corundum Inorganic materials 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 125000000524 functional group Chemical group 0.000 description 2
- 229910052500 inorganic mineral Inorganic materials 0.000 description 2
- 239000011707 mineral Substances 0.000 description 2
- 235000010755 mineral Nutrition 0.000 description 2
- 238000005065 mining Methods 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 239000011435 rock Substances 0.000 description 2
- 239000003469 silicate cement Substances 0.000 description 2
- 238000007711 solidification Methods 0.000 description 2
- 230000008023 solidification Effects 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 229910001845 yogo sapphire Inorganic materials 0.000 description 2
- 229910004760 CaSiO2 Inorganic materials 0.000 description 1
- 235000019738 Limestone Nutrition 0.000 description 1
- 239000011402 Portland pozzolan cement Substances 0.000 description 1
- 239000011401 Portland-fly ash cement Substances 0.000 description 1
- 230000003213 activating effect Effects 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 229910052925 anhydrite Inorganic materials 0.000 description 1
- 150000001450 anions Chemical group 0.000 description 1
- 230000000740 bleeding effect Effects 0.000 description 1
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 description 1
- 238000010835 comparative analysis Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000007596 consolidation process Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 239000013068 control sample Substances 0.000 description 1
- 230000018044 dehydration Effects 0.000 description 1
- 238000006297 dehydration reaction Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 229910001650 dmitryivanovite Inorganic materials 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000005429 filling process Methods 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 238000003837 high-temperature calcination Methods 0.000 description 1
- 230000000887 hydrating effect Effects 0.000 description 1
- 229910001707 krotite Inorganic materials 0.000 description 1
- 239000006028 limestone Substances 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 238000004137 mechanical activation Methods 0.000 description 1
- 230000010534 mechanism of action Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000002715 modification method Methods 0.000 description 1
- 230000000877 morphologic effect Effects 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 230000003334 potential effect Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000009257 reactivity Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 238000010517 secondary reaction Methods 0.000 description 1
- 238000005204 segregation Methods 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B7/00—Hydraulic cements
- C04B7/24—Cements from oil shales, residues or waste other than slag
- C04B7/246—Cements from oil shales, residues or waste other than slag from waste building materials, e.g. waste asbestos-cement products, demolition waste
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B7/00—Hydraulic cements
- C04B7/14—Cements containing slag
- C04B7/147—Metallurgical slag
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B7/00—Hydraulic cements
- C04B7/24—Cements from oil shales, residues or waste other than slag
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/10—Production of cement, e.g. improving or optimising the production methods; Cement grinding
Abstract
The invention discloses a modified gangue-based coal mine filling cementing material, and particularly relates to the field of material science and engineering, wherein the modified gangue-based coal mine filling cementing material comprises the following raw materials in parts by weight: 50-80 parts of modified gangue powder; 5-30 parts of fly ash; 10-30 parts of clinker; 3-20 of steel slag powder; 2-30 parts of gypsum, wherein the specific surface area of the modified gangue-based coal mine filling cementing material is 400-520 square meters per kilogram, the modified gangue powder is powder formed by grinding gangue with 1% by mass of an alcohol amine grinding aid, and the specific surface area of the modified gangue powder is 400-500 square meters per kilogram. The added modified gangue powder stimulates the activity of the gangue powder through physical chemistry, so that the link of high-temperature modification is reduced, the energy is saved, the environment is protected, 60-90% of raw materials belong to solid wastes in the local traditional industry, the energy consumption and resource exploitation are not increased, the local environment protection pressure can be relieved, the environment is protected, multiple purposes are realized, the cost is low, the raw materials are wide and easily available in source, the production process is simple, the energy consumption is low, and only grinding and mixing are needed.
Description
Technical Field
The invention relates to the technical field of material science and engineering, in particular to a modified gangue-based coal mine filling cementing material.
Background
The coal mine filling material mainly comprises two parts, namely aggregate and cementing agent, wherein the aggregate is mainly prepared from cheap available materials such as gangue and aeolian sand on site, and the insufficient part is prepared from nearby materials and crushed; most of mines adopt common silicate cement or slag cement, and a small amount of mines are doped with materials such as fly ash, red mud, lime and the like. At present, the following types of cementing materials are mainly used in filling:
(1) cement
At present, the cement used in construction engineering and mining engineering mainly includes portland cement, ordinary portland cement, portland slag cement, portland pozzolan cement, portland fly ash cement, and the like. Portland cement is still the most widely applied cementing material in the mining engineering at present, but has the defects of high cost, low adaptability, narrow adjustable range of water-cement ratio and sand-lime ratio and the like.
(2) Red mud
The red mud is polluting waste residue generated in the process of extracting alumina in the aluminum industry, and free water originally existing in the red mud can be converted into crystal water and cementing water after an activating agent is added, so that the red mud is cemented and hardened finally. Owing to the physical and chemical properties of red mud, it forms the technical foundation for the development of a cementing material for mine filling. The red mud has large specific surface area, good water retention performance and low dehydration concentration of slurry, and the red mud contains a large amount of sticky particles and colloidal particles, so the slurry has good stability, the slurry can also ensure the stability of the slurry under the condition of low concentration with good fluidity of the red mud full-tailing slurry, the slurry does not generate segregation, and the slurry has good leveling property when being filled into a goaf, thereby having very important significance for filling and roof-contacting of a narrow and long filling working face and a slowly inclined working face. The application of the red mud cemented filling in bauxite in Shandong Hutian in 90 th of 20 th century is successful, and the industrial test of red mud full-tailings cemented filling is carried out on Shandong Laiwu iron ore, the test effect is good, but the material is limited by the production area of raw materials and cannot be popularized in a large scale.
(3) High water content material
The high-water quick-setting tailing cemented filling material (referred to as high-water material for short) is a novel cemented material successfully researched in the late 80 s and early 90 s. The high-water material is a first solid powder and a second solid powder which are prepared by using bauxite, lime, limestone and gypsum as main raw materials and adding various inorganic raw materials and additives through the processes of crushing, drying, proportioning, homogenizing, firing, grinding and the like. The high-strength water-retaining agent has the characteristics of strong water-retaining capacity, strong single-slurry suspension property and fluidity, high solidification speed, high strength increase speed and the like, and can quickly solidify a high proportion of water into a solid with a certain bearing capacity. The volume water content can reach more than 70 percent, and the solidification strength can reach 0.5-1.0 MPa in 1 hour. This is advantageous in conditions where rapid packing and consolidation are required. However, the filling process is complex (two components), the cost is high (800 yuan to 1000 yuan per ton), the filling body has a water bleeding phenomenon, and the wide popularization and application have certain limitations. And the later strength is greatly reduced, and the filling body is easy to pulverize.
At present, most of mine filling cement is used as a cementing material, and has the defects of high cost, low strength, poor fluidity, low roof contact rate and the like. A large amount of waste rocks generated in coal mines are accumulated, a good utilization method is not provided, land occupation is greatly increased, environmental damage is aggravated, and the great use of the waste rocks also becomes a necessary trend of the coal mines. The gangue-based filling material can well solve the two problems, not only can utilize a large amount of gangue, but also can reduce the mine filling cost.
The Chinese patent application CN105152601B discloses a gangue-based filling material preparation method, which is characterized in that the potential gelling activity of gangue is excited by a composite excitation mode, part of the gangue is used as a gelling material for mine cemented filling instead of cement, and then the gangue is mixed with fine-grain-size gangue to prepare the mine cemented filling material. The gangue composite excitation process comprises the following steps: the process flow is complex, the high-temperature calcination belongs to a process with high energy consumption and high cost, and the feasibility of industrial application is not high.
Disclosure of Invention
In order to overcome the defects in the prior art, the embodiment of the invention provides an environment-friendly concept of 'making waste with waste', raw materials are mainly derived from coal gangue in local mines, solid waste generated by power plants, steel plants and chemical plants, and the raw materials are prepared into the special cementing material for mine filling with high cost performance by an ultra-fine grinding and organic activity-activated green modification method, so as to solve the problems in the background art.
In order to achieve the purpose, the invention provides the following technical scheme: the modified gangue-based coal mine filling cementing material comprises the following raw materials in parts by weight:
50-80 parts of modified gangue powder;
5-30 parts of fly ash;
10-30 parts of clinker;
3-20 of steel slag powder;
2-30 parts of gypsum.
Further, the specific surface area of the modified gangue-based coal mine filling cementing material is 400-520 square meters per kg.
Further, the modified gangue powder is powder formed by grinding gangue with 1% by mass of an alcamines grinding aid, and the specific surface area of the modified gangue powder is 400-500 square meters per kg.
Further, the specific surface area of the fly ash is 300-600 square meters per kg.
Further, the steel slag powder is powder formed by grinding steel slag through a ball mill, and the specific surface area of the steel slag powder is 500-700 square meters per kg.
Further, the gypsum is one or more of natural gypsum, fluorgypsum or desulfurization gypsum, and the specific surface area of the gypsum is 300-500 square meters per kg.
The invention has the technical effects and advantages that:
1. the modified gangue powder added in the invention has the advantages of reducing the links of high-temperature modification by exciting the activity of the modified gangue powder through physical chemistry, saving energy and protecting environment.
2. 60-90% of raw materials in the invention belong to solid wastes in the local traditional industry, energy consumption and resource exploitation are not increased, the local environmental protection pressure can be relieved, and the invention is green and environment-friendly.
3. The invention has low cost and wide and easily available raw material sources.
4. The invention has simple production process and low energy consumption, and only needs grinding and mixing.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention provides a modified gangue-based coal mine filling cementing material which comprises the following raw materials in parts by weight:
50-80 parts of modified gangue powder;
5-30 parts of fly ash;
10-30 parts of clinker;
3-20 of steel slag powder;
2-30 parts of gypsum.
In a preferred embodiment, the specific surface area of the modified gangue-based coal mine filling cementing material is 400-520 square meters per kg.
In a preferred embodiment, the modified gangue powder is powder formed by grinding gangue by adding 1% by mass of an alcamines grinding aid, and the specific surface area of the modified gangue powder is 400-500 square meters per kg.
In a preferred embodiment, the fly ash has a specific surface area of from 300 to 600 square meters per kg.
In a preferred embodiment, the steel slag powder is powder formed by grinding steel slag through a ball mill, the specific surface area of the steel slag powder is 500-700 square meters per kilogram, the steel slag is a byproduct in a steel-making process, and the steel slag is composed of various oxides formed by oxidizing impurities such as silicon, manganese, phosphorus, sulfur and the like in pig iron in a smelting process and salts generated by reacting the oxides with a solvent, and the steel slag contains various useful components: 2-8% of metallic iron, 40-60% of calcium oxide, 3-10% of magnesium oxide and 1-8% of manganese oxide.
In a preferred embodiment, the gypsum is one or more of natural gypsum, fluorgypsum or desulfurized gypsum, and the specific surface area of the gypsum is 300-500 square meters per kg.
Mechanism of action of the invention
Firstly, fully exciting potential active components contained in the gangue through physical excitation and chemical excitation.
1. The specific surface area of the gangue micropowder is controlled to be more than or equal to 400m2/kg through grinding, physical excitation is achieved, and the potential activity of the gangue can be remarkably improved through grinding according to a mechanical activation theory. In the process of grinding the gangue into fine powder, part of external energy is converted into the surface energy of gangue particles, so that the surfaces of the gangue particles are in a metastable state, and the reactivity of the surfaces is increased. Along with the reduction of the particle size of the gangue particles, the specific surface area is increased, when the specific surface area of the gangue micropowder is more than or equal to 400m2/kg, the crystal lattice distortion of the gangue particles occurs to different degrees in the intensive grinding process, the size of crystal materials is reduced, amorphous or non-crystalline substances are formed on the surface, the morphological effect and the micro-aggregate effect of the amorphous or non-crystalline substances are fully exerted, and the number of active groups of the gangue is increased.
2. The alcohol amine type high molecular polymer is added as a special exciting agent for the gangue, the physicochemical property on the particle interface of the gangue micropowder is changed by depending on the surface activity performance and the function of functional groups, the superfine grinding of the gangue is realized, the functional groups and the anion functional groups in the high molecular structure are mutually coordinated, SiO2 crystals in the gangue and minerals containing Al2O3 obtain better solubility, potential reaction active components contained in the gangue are greatly excited, and the components can react with Ca (HO)2 or CaSO4 separated from clinker and steel slag by hydration to generate a stable compound with gelling property.
Secondly, in the hardening process of the gangue-based cementing material, active components provided by gangue powder participate in the hydration process, namely hydrated calcium silicate CaSiO2.nH2O (C-S-H gel), hydrated calcium aluminate CaAl2O4.nH2O (C-A-H gel), calcium hydroxide Ca (OH)2 and the like are generated by hydrating silicate cement clinker minerals. The second step is that the active components in the gangue micropowder react with the hydration products. As the hydration time is prolonged, the reaction of the gangue potential active components and clinker products is more sufficient. The active components of the gangue participate in the secondary reaction in the hydration of clinker to generate hydrated calcium silicate, hydrated calcium aluminate and the like with lower solubility. The particles are taken as a matrix to form a crystal intergrowth structure, so that the structure and the durability of the filling body are improved, the strength of the filling body is exerted to a greater extent, and the later strength is higher. The reaction formula is as follows:
Ca(OH)2+SiO2+nH2O→C-S-H (1)
C-S-H+SiO2+nH2O→C-S-H (2)
3CaO.Al2O3.6H2O+xSiO2→3CaO.Al2O3.xSiO2(6-2x)H2O+2xH2O(3)
example 1
The modified gangue-based coal mine filling cementing material comprises the following raw materials in parts by weight:
60 parts of modified gangue powder;
10 parts of fly ash;
5 parts of steel slag powder;
10 parts of desulfurized gypsum;
15 parts of clinker.
Mixing the above materials at a certain proportion to obtain No. 1.
Further, the specific surface area of the modified gangue-based coal mine filling cementing material is 420 square meters per kg.
Further, the specific surface area of the modified gangue powder is 450 square meters per kg.
Further, the specific surface area of the fly ash is 400 square meters per kg.
Furthermore, the specific surface area of the desulfurized gypsum is 350 square meters per kg.
Furthermore, the specific surface area of the steel slag powder is 600 square meters per kg, the steel slag is a byproduct in the steel-making process, and consists of various oxides formed by oxidizing impurities such as silicon, manganese, phosphorus, sulfur and the like in pig iron in the smelting process and salts generated by the reaction of the oxides and a solvent, and the steel slag contains various useful components: 2-8% of metallic iron, 40-60% of calcium oxide, 3-10% of magnesium oxide and 1-8% of manganese oxide.
Furthermore, the specific surface area of the clinker powder is 320 square meters per kg.
Example 2
The modified gangue-based coal mine filling cementing material comprises the following raw materials in parts by weight:
70 parts of modified gangue powder;
10 parts of fly ash;
5 parts of steel slag powder;
5 parts of desulfurized gypsum;
10 parts of clinker.
Mixing the above materials at a certain proportion to obtain No. 2.
Further, the specific surface area of the modified gangue-based coal mine filling cementing material is 450 square meters per kg.
Further, the specific surface area of the modified gangue powder is 480 square meters per kg.
Further, the specific surface area of the fly ash is 400 square meters per kg.
Furthermore, the specific surface area of the desulfurized gypsum is 320 square meters per kg.
Furthermore, the specific surface area of the steel slag powder is 630 square meters per kg, the steel slag is a byproduct in the steel making process, and the steel slag consists of various oxides formed by oxidizing impurities such as silicon, manganese, phosphorus, sulfur and the like in pig iron in the smelting process and salts generated by the reaction of the oxides and a solvent, and contains various useful components: 2-8% of metallic iron, 40-60% of calcium oxide, 3-10% of magnesium oxide and 1-8% of manganese oxide.
Further, the specific surface area of the clinker powder is 300 square meters per kg.
Example 3
The modified gangue-based coal mine filling cementing material comprises the following raw materials in parts by weight:
80 parts of modified gangue powder;
5 parts of fly ash;
3 parts of steel slag powder;
2 parts of desulfurized gypsum;
10 parts of clinker.
Mixing the above materials at a certain proportion to obtain No. 3.
Further, the specific surface area of the modified gangue-based coal mine filling cementing material is 520 square meters per kg.
Further, the specific surface area of the modified gangue powder is 500 square meters per kg.
Further, the specific surface area of the fly ash is 460 square meters per kg.
Furthermore, the specific surface area of the desulfurized gypsum is 450 square meters per kg.
Furthermore, the specific surface area of the steel slag powder is 660 square meters per kg, the steel slag is a byproduct in the steel making process, and the steel slag comprises various oxides formed by oxidizing impurities such as silicon, manganese, phosphorus, sulfur and the like in pig iron in the smelting process and salts generated by the reaction of the oxides and a solvent, and contains various useful components: 2-8% of metallic iron, 40-60% of calcium oxide, 3-10% of magnesium oxide and 1-8% of manganese oxide.
Further, the specific surface area of the clinker powder is 350 square meters per kg.
Example 4
The modified gangue-based coal mine filling cementing material comprises the following raw materials in parts by weight:
50 parts of modified gangue powder;
20 parts of fly ash;
8 parts of steel slag powder;
7 parts of desulfurized gypsum;
15 parts of clinker.
Mixing the above materials at a certain proportion to obtain No. 4.
Further, the specific surface area of the modified gangue-based coal mine filling cementing material is 450 square meters per kg.
Further, the specific surface area of the modified gangue powder is 480 square meters per kg.
Further, the specific surface area of the fly ash is 400 square meters per kg.
Furthermore, the specific surface area of the desulfurized gypsum is 320 square meters per kg.
Furthermore, the specific surface area of the steel slag powder is 630 square meters per kg, the steel slag is a byproduct in the steel making process, and the steel slag consists of various oxides formed by oxidizing impurities such as silicon, manganese, phosphorus, sulfur and the like in pig iron in the smelting process and salts generated by the reaction of the oxides and a solvent, and contains various useful components: 2-8% of metallic iron, 40-60% of calcium oxide, 3-10% of magnesium oxide and 1-8% of manganese oxide.
Further, the specific surface area of the clinker powder is 300 square meters per kg.
Example 5
The modified gangue-based coal mine filling cementing material comprises the following raw materials in parts by weight:
60 parts of modified gangue powder;
20 parts of fly ash;
5 parts of steel slag powder;
5 parts of desulfurized gypsum;
10 parts of clinker.
Mixing the above materials at a certain proportion to obtain No. 5.
Further, the specific surface area of the modified gangue-based coal mine filling cementing material is 460 square meters per kg.
Further, the specific surface area of the modified gangue powder is 430 square meters per kg.
Further, the specific surface area of the fly ash is 400 square meters per kg.
Furthermore, the specific surface area of the desulfurized gypsum is 350 square meters per kg.
Furthermore, the specific surface area of the steel slag powder is 600 square meters per kg, the steel slag is a byproduct in the steel-making process, and consists of various oxides formed by oxidizing impurities such as silicon, manganese, phosphorus, sulfur and the like in pig iron in the smelting process and salts generated by the reaction of the oxides and a solvent, and the steel slag contains various useful components: 2-8% of metallic iron, 40-60% of calcium oxide, 3-10% of magnesium oxide and 1-8% of manganese oxide.
Further, the specific surface area of the clinker powder is 330 square meters per kg.
Blank control sample
P.C.32.5 cement.
According to the mass ratio of the cementing material to the gangue tailings of 1:4, water is added, the mixture is stirred and mixed until the filling material with the concentration of 70 percent, and under the same conditions, the fluidity and the compressive strength of the examples 1-5 and the control group are as follows:
in summary, according to comparative analysis of examples 1 to 5 and a control group, compared with the prior art of p.c.32.5 cement, the filling material prepared by mixing the low-modified gangue-based coal mine filling cementing material provided by the invention has good fluidity retention, fast hardening and high strength when the technical scheme of example 4 is adopted.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that are within the spirit and principle of the present invention are intended to be included in the scope of the present invention.
Claims (6)
1. The modified gangue-based coal mine filling cementing material is characterized by comprising the following raw materials in parts by weight:
50-80 parts of modified gangue powder;
5-30 parts of fly ash;
10-30 parts of clinker;
3-20 of steel slag powder;
2-30 parts of gypsum.
2. The modified gangue-based coal mine filling cementing material as claimed in claim 1, which is characterized in that: the specific surface area of the modified gangue-based coal mine filling cementing material is 400-520 square meters per kg.
3. The modified gangue-based coal mine filling cementing material as claimed in claim 1, which is characterized in that: the modified gangue powder is powder formed by adding 1% by mass of an alcamines grinding aid into gangue and grinding, and the specific surface area of the modified gangue powder is 400-500 square meters per kg.
4. The modified gangue-based coal mine filling cementing material as claimed in claim 1, which is characterized in that: the specific surface area of the fly ash is 300-600 square meters per kg.
5. The modified gangue-based coal mine filling cementing material as claimed in claim 1, which is characterized in that: the steel slag powder is powder formed by grinding steel slag through a ball mill, and the specific surface area of the steel slag powder is 500-700 square meters per kg.
6. The modified gangue-based coal mine filling cementing material as claimed in claim 1, which is characterized in that: the gypsum is one or more of natural gypsum, fluorine gypsum or desulfurization gypsum, and the specific surface area of the gypsum is 300-500 square meters per kg.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113548865A (en) * | 2021-08-26 | 2021-10-26 | 中国矿业大学 | Fractal gangue cemented filling material and preparation method thereof |
| CN115028403A (en) * | 2022-05-10 | 2022-09-09 | 山东鲁碧建材有限公司 | Green solid waste base glue solid powder gel material and preparation method thereof |
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| GB1436507A (en) * | 1974-11-22 | 1976-05-19 | Iu Conversion Systems | Method of treating coal mining refuse |
| CN107814499A (en) * | 2017-11-28 | 2018-03-20 | 山东众森节能材料有限公司 | A kind of composite gelled material, preparation method and application |
| CN112142420A (en) * | 2020-09-16 | 2020-12-29 | 张延年 | Multi-solid-waste large-mixing-amount baking-free water permeable brick and preparation method thereof |
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2021
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1436507A (en) * | 1974-11-22 | 1976-05-19 | Iu Conversion Systems | Method of treating coal mining refuse |
| CN107814499A (en) * | 2017-11-28 | 2018-03-20 | 山东众森节能材料有限公司 | A kind of composite gelled material, preparation method and application |
| CN112142420A (en) * | 2020-09-16 | 2020-12-29 | 张延年 | Multi-solid-waste large-mixing-amount baking-free water permeable brick and preparation method thereof |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113548865A (en) * | 2021-08-26 | 2021-10-26 | 中国矿业大学 | Fractal gangue cemented filling material and preparation method thereof |
| CN115028403A (en) * | 2022-05-10 | 2022-09-09 | 山东鲁碧建材有限公司 | Green solid waste base glue solid powder gel material and preparation method thereof |
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