CN115925286A - Low-cost multi-source solid waste filling cementing material and preparation method and application thereof - Google Patents
Low-cost multi-source solid waste filling cementing material and preparation method and application thereof Download PDFInfo
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- 238000011049 filling Methods 0.000 title claims abstract description 75
- 239000000463 material Substances 0.000 title claims abstract description 74
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- 238000002360 preparation method Methods 0.000 title claims abstract description 12
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims abstract description 116
- 239000002893 slag Substances 0.000 claims abstract description 68
- 239000000292 calcium oxide Substances 0.000 claims abstract description 59
- 235000012255 calcium oxide Nutrition 0.000 claims abstract description 59
- 239000010440 gypsum Substances 0.000 claims abstract description 56
- 229910052602 gypsum Inorganic materials 0.000 claims abstract description 56
- 239000011521 glass Substances 0.000 claims abstract description 52
- 239000002699 waste material Substances 0.000 claims abstract description 50
- 239000003245 coal Substances 0.000 claims abstract description 47
- 239000003818 cinder Substances 0.000 claims abstract description 40
- 239000002956 ash Substances 0.000 claims abstract description 31
- 239000010881 fly ash Substances 0.000 claims abstract description 22
- 239000000203 mixture Substances 0.000 claims abstract description 15
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 11
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 14
- 229910052742 iron Inorganic materials 0.000 claims description 12
- 229910018072 Al 2 O 3 Inorganic materials 0.000 claims description 10
- 230000000694 effects Effects 0.000 claims description 9
- 239000002245 particle Substances 0.000 claims description 8
- 239000002002 slurry Substances 0.000 claims description 8
- 239000000126 substance Substances 0.000 claims description 8
- 238000000227 grinding Methods 0.000 claims description 7
- 238000000034 method Methods 0.000 claims description 7
- 239000006227 byproduct Substances 0.000 claims description 6
- 238000002156 mixing Methods 0.000 claims description 5
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 claims description 4
- PASHVRUKOFIRIK-UHFFFAOYSA-L calcium sulfate dihydrate Chemical compound O.O.[Ca+2].[O-]S([O-])(=O)=O PASHVRUKOFIRIK-UHFFFAOYSA-L 0.000 claims description 3
- 239000013078 crystal Substances 0.000 claims description 3
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 2
- 229910000616 Ferromanganese Inorganic materials 0.000 claims description 2
- 229910017976 MgO 4 Inorganic materials 0.000 claims description 2
- 229910000831 Steel Inorganic materials 0.000 claims description 2
- 238000000498 ball milling Methods 0.000 claims description 2
- 238000001035 drying Methods 0.000 claims description 2
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- 239000000295 fuel oil Substances 0.000 claims description 2
- DALUDRGQOYMVLD-UHFFFAOYSA-N iron manganese Chemical compound [Mn].[Fe] DALUDRGQOYMVLD-UHFFFAOYSA-N 0.000 claims description 2
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- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 description 2
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- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 description 1
- 229910000805 Pig iron Inorganic materials 0.000 description 1
- 229910002800 Si–O–Al Inorganic materials 0.000 description 1
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- 238000003723 Smelting Methods 0.000 description 1
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- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
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- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
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- 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
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- Processing Of Solid Wastes (AREA)
Abstract
The invention relates to the field of mine filling cementing materials, in particular to a low-cost multi-source solid waste filling cementing material and a preparation method and application thereof. The cementing material comprises the following components in percentage by mass: 8-15% of desulfurized gypsum, 5-10% of quicklime, 15-25% of desulfurized ash, 50-65% of slag, 0-5% of waste glass and 0-5% of coal cinder. The invention takes slag and solid wastes such as desulfurized fly ash, desulfurized gypsum, waste glass, coal cinder and the like as main raw materials, combines the raw materials for development, and simultaneously adds a small amount of quicklime to provide an alkaline environment and CaO to be used as a materialThe new filling cementing agent is used to replace cement, and the materials are proportioned, stoved, crushed and ground to reach Bos specific surface area of 320-450 m 2 The obtained mixture is used as a cementing material, is mixed with coarse aggregates such as tailings, coal gangue and the like by adding water, has the excellent performances in various aspects such as high early and later strength, quick forming, easy demoulding and the like, and is an environment-friendly filling cementing material with low cost and high performance.
Description
Technical Field
The invention relates to the technical field of mine filling cementing materials, in particular to a low-cost multi-source solid waste filling cementing material and a preparation method and application thereof.
A large amount of downhole goaf filling requires the consumption of tens of thousands of tons of cement. According to statistics, the filling cost accounts for about 1/3 of the mining cost, and the expensive filling cost not only causes great economic pressure on mines, but also severely restricts the application and development of filling mining technology. The adoption of new technology can reduce the consumption of cement or find cement substitute without reducing the strength of filling body, and is the main attack direction of filling technology.
Slag is a by-product of a potentially reactive material produced in blast furnace non-ferrous metallurgy. The calcium content of the dry desulfurization ash byproduct is very high, and the dry desulfurization ash byproduct is often used as a concrete admixture. The chemical components of the desulfurized gypsum are the same as those of natural gypsum and are calcium sulfate dihydrate crystals CaSO 4 ·2H 2 And O. The fine waste glass aggregate and the slag can generate a pozzolanic reaction. The coal slag is formed by that when the coal water slurry is gasified, the raw material coal is quickly gasified in a high-temperature region to react and release gas, and the molten coal slag is quickly contacted with high-pressure chilling water in a chilling chamber and cooled and solidified into small solid granular glass slag with obvious cellular pore structure. The conventional solid waste synergistic utilization types are generally limited to 2 or 3, the mutual synergistic effect of multi-source solid waste is not utilized and the effect of the multi-source solid waste is to be improved, and a novel low-cost multi-source solid waste cementing material is urgently needed to be provided so as to fully utilize the chemical components and the volcanic ash characteristics of the multi-source solid waste and synergistically use the wastes for mine filling.
Disclosure of Invention
In order to solve the technical problems, the invention provides a low-cost multi-source solid waste cementing material and a preparation method thereof. The filling cementing material combined and acted by the desulfurized gypsum, the quicklime, the desulfurized fly ash, the blast furnace slag, the waste glass and the coal slag can well meet the requirement of underground filling strength after being mixed with coarse aggregates such as tailings, coal gangue and the like by adding water, further reduces the filling cost of a mine, and is an ideal mine filling environment-friendly cementing material suitable for low cost.
In a first aspect, the low-cost multi-source solid waste filling cementing material provided by the invention comprises the following components in percentage by weight: 8-15% of desulfurized gypsum, 5-10% of quicklime, 15-25% of desulfurized ash, 50-65% of slag, 0-5% of waste glass and 0-5% of coal cinder.
The cementing material provided by the invention only needs to be ground by a ball mill, does not need to be calcined at high temperature, is environment-friendly and pollution-free, is ground to a certain specific surface area, has high activity, and particularly, the desulfurized gypsum, the quicklime, the desulfurized ash, the blast furnace slag, the waste glass and the coal cinder in the cementing material are low in cost and easy to obtain, and realize the synergistic interaction among the physical and chemical properties of solid waste materials, reduce the filling mining cost, realize the resource utilization of industrial waste, and simultaneously have excellent mechanical properties, quick forming, easy demoulding and other comprehensive properties.
The invention discovers that under the interaction of the desulfurized gypsum, the quicklime, the desulfurized ash, the blast furnace slag, the waste glass and the coal cinder with the optimal dosage, the novel low-cost multisource solid waste filling cementing material can completely replace cement, does not need to add an additional excitant, greatly reduces the filling cost, and can realize the further improvement of the comprehensive performances of the filling material such as early and later compressive strength and the like under the combined action of specific components with specific dosages and specific surface areas.
Preferably, the composition comprises the following components in percentage by weight: 12-15% of desulfurized gypsum, 7-10% of quicklime, 15-20% of desulfurized ash, 53-58% of slag, 2-5% of waste glass and 2-4% of coal cinder;
it is further preferable that the concentration of the organic compound,the composition comprises the following components in percentage by weight: 8 to 10 percent of desulfurized gypsum, 9 to 10 percent of quicklime, 15 to 20 percent of desulfurized ash, 55 to 58 percent of slag, 4 to 5 percent of waste glass and 2 to 4 percent of coal cinder, wherein the specific surface area of each component is preferably 320 to 450m 2 /kg。
Preferably, the slag is selected from one or more of water-quenched blast furnace iron-making slag, water-quenched ferromanganese and steel slag, and is preferably water-quenched blast furnace slag. The blast furnace slag of the present invention is preferably blast furnace slag having hydraulic properties that is rapidly cooled when smelting pig iron.
Further preferably, the slag comprises the following components in percentage by mass: caO 40-50%, siO 2 20～30％，Al 2 O 3 10～20％，MgO 4～10％，Fe 2 O 3 1 to 2 percent; preferably, the basicity coefficient Mo of the slag is 1-1.4, the mass coefficient k is more than or equal to 1.2, and the activity coefficient>1. In the invention, the preferable slag is adopted to be compounded with the desulfurized fly ash, the desulfurized gypsum, the quicklime, the desulfurized fly ash, the waste glass and the coal slag, the synergistic effect of all the components can be more fully excited, the desulfurized fly ash contains a certain amount of free calcium oxide and gypsum phase, and the slag is subjected to alkali (OH-) and gypsum (SO 4) 2- ) Double excitation effect. Reducing the particle size of the waste glass increases the pozzolanic properties and results in the production of a cementitious material, leading to a pozzolanic reaction between the fine waste glass aggregate and the slag, and the cinder destroys the hard-to-hydrate dense layer on the surface of the slag glass, exposes the glass which is easy to hydrate inside, destroys the Si-O-Si and Si-O-Al network structures in depolymerized slag, and excites the slag activity. The lime contains a large amount of calcium oxide and gypsum phase, and plays a role in activating the mineral powder by alkali and sulfur. Under the excitation of an alkaline environment, sulfate particles of the desulfurized gypsum can better excite the volcanic ash activity of the fly ash and generate a large amount of hydration products such as C-S-H, ettringite, dihydrate gypsum and the like. Resulting in a gradual increase in the strength of the packed sample.
Preferably, the desulfurized ash comprises the following components in percentage by mass: siO 2 2 20～30％，Al 2 O 3 10～20％，CaO 5～10％、SO 3 10～15％、Fe 2 O 3 1 to 5 percent and MgO 1 to 4 percent.
In the invention, the byproduct desulfurized ash of dry desulfurization is adopted to well replace part of clay and other silicate raw materials in cement.
Preferably, the desulfurized gypsum is industrial byproduct gypsum obtained by treating sulfur dioxide in coal-fired or fuel oil flue gas; the main chemical component of the desulfurized gypsum is preferably calcium sulfate dihydrate crystal CaSO 4 ·2H 2 O，SO 3 The content of (b) is preferably 25% to 46%.
Further preferably, the desulfurized gypsum comprises the following components in percentage by mass: siO 2 2 1～5％，Al 2 O 3 0～2％，Fe 2 O 3 0～1％，CaO 30～33％、SO 3 40-45 percent.
Further preferably, the coal cinder comprises the following components in percentage by mass: siO 2 2 70～80％，Al 2 O 3 5～10％，CaO 1～4％，MgO 1～4％，Fe 2 O 3 2-10% and SO 3 0 to 2 percent and the loss on ignition is 1 to 4 percent.
Further preferably, the waste glass comprises the following components in percentage by mass: siO 2 2 70～80％，Al 2 O 3 0～5％，CaO 0～4％，MgO 10～20％，Fe 2 O 3 0 to 1 percent of the composition.
Further preferably, the main chemical component of the quicklime is CaO, and the mass fraction of CaO is preferably more than 85%.
According to the invention, parameters of components of the desulfurized fly ash, the desulfurized gypsum, the quicklime, the desulfurized fly ash, the waste glass and the coal cinder are optimized, under the interaction of the optimized components, especially under the combined action of the desulfurized fly ash, the desulfurized gypsum, the quicklime, the desulfurized fly ash, the waste glass and the coal cinder under specific dosage and optimized parameters, the compressive strength of the multisource solid waste cementing material in each stage can be unexpectedly improved, and the filling body formed by the filling body has better mechanical properties, better construction performance, greatly reduced cost and remarkable comprehensive effect.
In a second aspect, the invention provides a low-cost multi-source solid waste cementing materialThe preparation method comprises the following steps: grinding the desulfurized gypsum, the quicklime, the desulfurized fly ash, the slag, the waste glass and the coal cinder according to the proportion; preferably grinding until the Bo's specific surface area is 320-450 m 2 /kg。
Preferably, the preparation method of the low-cost multi-source solid waste cementing material provided by the invention comprises the following steps:
1) Drying the desulfurized gypsum, the quicklime, the desulfurized ash, the slag and the coal cinder at a temperature of between 90 and 100 ℃ preferably;
2) Roughly crushing waste glass, wherein the particle size of the roughly crushed waste glass is less than 5mm, and preferably 2-5 mm;
3) Mixing the desulfurized gypsum, the quicklime, the desulfurized fly ash, the slag, the cinder and the waste glass obtained in the steps 1) and 2) according to the weight ratio to obtain a mixed proportioning material;
4) Ball-milling the mixed proportioning material obtained in the step 3), preferably grinding until the Bosch specific surface area is 320-450 m 2 /kg；
Or the step 3) is: the desulfurized gypsum, the quicklime, the desulfurized fly ash, the slag, the cinder and the waste glass obtained in the steps 1) and 2) are respectively ground until the Boehringer's specific surface area is 320-450 m 2 And/kg, and then mixing uniformly.
In a third aspect, the low-cost multisource solid waste filling cementing material or the preparation method of the low-cost multisource solid waste filling cementing material provided by the invention is applied to mine filling, preferably filling of a goaf under a coal mine; preferably, the low-cost multisource solid waste filling cementing material is used as a cementing material to be mixed with coarse aggregate and water to form a filling body; preferably, the coarse aggregate is tailings and/or coal gangue, the coarse aggregate is preferably tailings, and the mass ratio of the low-cost multi-source solid-waste filling cementing material to the coarse aggregate is (1); the mass concentration of the slurry is 69-73%, such as 69%,71% and 73%.
The invention has the beneficial effects that: compared with the existing cement cementing material, the cementing material has simpler composition and higher solid waste content, the multi-source solid waste synergistic ratio exceeds 90%, and a small amount of quicklime is added, so that the raw material cost is greatly reduced, the mutual excitation effect of the solid waste is fully utilized, and the utilization rate of the solid waste is higher. In addition, the components of the invention can show good cementing property due to the synergistic effect, and the filler can be stirred with coarse aggregates such as tailings, coal gangue and the like into filling slurry without adding an activator, and the filler can well meet the requirement of mechanical strength. The invention also optimizes the proportion and the chemical composition of each component on the basis of the formula, and improves the gelling property to a greater extent while reducing the industrial cost. In addition, the invention reduces the step of burning in the cement preparation process, reduces the energy and environmental cost and simplifies the preparation process. The large-scale solid waste is used for replacing cement to be used as a filling cementing material to lay the foundation of engineering application.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a graph showing the distribution of the initial particle sizes of desulfurized fly ash, quicklime, desulfurized gypsum, waste glass (ground) and slag (a-e) in examples of the present invention;
FIG. 2 is an SEM image of coal cinder in an example of the present invention;
FIG. 3 is an SEM image of hydration of the 28d packing provided in example 4 of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. 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 examples do not show the specific techniques or conditions, according to the technical or conditions described in the literature in the field, or according to the product specifications. The instruments and the like are conventional products which are purchased by normal distributors and are not indicated by manufacturers. The process is conventional unless otherwise specified, and the starting materials are commercially available from a public source. The examples do not show the specific techniques or conditions, according to the technical or conditions described in the literature in the field, or according to the product specifications.
The following examples are intended to illustrate the invention, but are not intended to limit the scope of the invention.
In the following examples of the present invention, the desulfurized gypsum was obtained from LlIgong Cement Co.Ltd, the quicklime was obtained from LlIgong Cement Co.Ltd, the desulfurized fly ash was obtained from LlIgong City national thermal power plant, the slag was obtained from Shanxi Zhongke Fine slag powder product Co.Ltd, the waste glass was obtained from LlIgong House refuse treatment station, and the slag was obtained from LlIgong City national thermal power plant (SEM image of slag is shown in FIG. 2). The desulfurized fly ash, quicklime, desulfurized gypsum, waste glass (ground), and slag (a-e) in the examples had initial particle size distributions as shown in FIG. 1.
In the following examples of the invention, the provided low-cost multi-source solid waste filling cementing material is prepared according to the following preparation method:
1) The desulfurized gypsum, the quicklime, the desulfurized ash, the blast furnace slag and the coal cinder are dried at the temperature of between 90 and 100 ℃.
2) Roughly crushing waste glass, wherein the particle size of the roughly crushed waste glass is less than 5mm, and preferably 2-5 mm;
3) Mixing the desulfurized gypsum, the quicklime, the desulfurized ash, the slag, the cinder and the waste glass according to the weight ratio to obtain a mixture ratio material
4) The obtained mixed proportioning material is ball milled, preferably milled until the Bosch specific surface area is 320-450 m 2 /kg。
Example 1
The embodiment provides a low-cost multisource solid waste filling cementing material, which comprises the following components: 12% of desulfurized gypsum, 9% of quicklime, 15% of desulfurized ash, 58% of slag, 2% of waste glass and 4% of coal cinder.
Example 2
The embodiment provides a low-cost multi-source solid waste filling cementing material which comprises the following components: 12% of desulfurized gypsum, 9% of quicklime, 20% of desulfurized fly ash, 53% of slag, 2% of waste glass and 3% of coal cinder.
Example 3.
The embodiment provides a low-cost multisource solid waste filling cementing material, which comprises the following components: 12% of desulfurized gypsum, 9% of quicklime, 25% of desulfurized ash, 49% of slag, 2% of waste glass and 3% of coal cinder.
Example 4
The embodiment provides a low-cost multisource solid waste filling cementing material, which comprises the following components: 8% of desulfurized gypsum, 10% of quicklime, 15% of desulfurized ash, 58% of slag, 5% of waste glass and 4% of coal cinder.
Example 5
The embodiment provides a low-cost multisource solid waste filling cementing material, which comprises the following components: 15% of desulfurized gypsum, 10% of quicklime, 15% of desulfurized fly ash, 58% of slag, 0% of waste glass and 2% of coal cinder.
Example 6
The embodiment provides a low-cost multisource solid waste filling cementing material, which comprises the following components: 12% of desulfurized gypsum, 9% of quicklime, 15% of desulfurized ash, 58% of slag, 0% of waste glass and 6% of coal cinder.
Example 7
The embodiment provides a low-cost multisource solid waste filling cementing material, which comprises the following components: 8% of desulfurized gypsum, 9% of quicklime, 20% of desulfurized fly ash, 53% of slag, 7% of waste glass and 3% of coal cinder.
Example 8
The embodiment provides a low-cost multisource solid waste filling cementing material, which comprises the following components: 12% of desulfurized gypsum, 9% of quicklime, 15% of desulfurized ash, 58% of slag, 4% of waste glass and 2% of coal cinder.
Example 9
The embodiment provides a low-cost multisource solid waste filling cementing material, which comprises the following components: 15% of desulfurized gypsum, 9% of quicklime, 15% of desulfurized ash, 58% of slag, 3% of waste glass and 0% of coal cinder.
Example 10
The embodiment provides a low-cost multisource solid waste filling cementing material, which comprises the following components: 12% of desulfurized gypsum, 9% of quicklime, 15% of desulfurized ash, 58% of slag, 3% of waste glass and 3% of coal cinder.
Comparative example 1
The comparative example 1 provides a solid waste filling cementing material, which comprises the following components: this comparative example 4 provides a solid waste filling cementitious material, the component composition is: 5% of desulfurized gypsum, 12% of quicklime, 13% of desulfurized ash, 45% of slag, 10% of waste glass and 15% of coal cinder.
Comparative example 2
This comparative example 2 provides a solid waste filling cementitious material, the component composition is: 0% of desulfurized gypsum, 5% of quicklime, 30% of desulfurized fly ash, 40% of slag, 15% of waste glass and 10% of coal cinder.
Comparative example 3
The comparative example 3 provides a solid waste filling cementing material, which comprises the following components: 5% of desulfurized gypsum, 0% of quicklime, 40% of desulfurized fly ash, 35% of slag, 10% of waste glass and 15% of coal cinder.
Comparative example 4
The comparative example 4 provides a solid waste filling cementing material, which comprises the following components: 25% of desulfurized gypsum, 15% of quicklime, 15% of desulfurized ash, 20% of slag, 15% of waste glass and 10% of coal cinder.
The solid waste filled cementitious materials provided in the above examples and comparative examples were mixed with water. Injecting the prepared slurry into a standard triple test mold with the thickness of 70.7mm multiplied by 70.7 mm; the water-cement ratio was controlled to 0.65.
The above samples were subjected to performance tests.
Wherein, the 3d,7d,14d,28d compressive strength of the filling body is measured according to the method in the basic performance test method Standard of building mortar (JGJ/T70-2009), the sample cured under the test condition is transferred into a constant temperature box for curing, the temperature is adjusted to 20 ℃, and the relative humidity is 95%. The sample blocks of the fillers were cured to 3d,7d,14d and 28d, and 3 samples were prepared at each age for each formulation. Uniaxial compressive strength experiments were performed using a DYE-300 uniaxial press.
The test results are shown in table 1.
TABLE 1 results of Performance test of each example and comparative example
The low-cost multisource solid waste filling cementing material provided by the embodiment 4 is used as a cementing material to be mixed with coarse aggregate and water to form a filling body, and the coarse aggregate adopts gold ore full tailings.
The particle composition characteristic value of the whole tailings is as follows: d 10 ＝57.92μm、d 30 ＝193.6μm、d 60 =243.53 μm, median diameter d 50 =234.16 μm. The loose volume weight of the whole tailings is 1.347g/cm 3 。
The results of the strength test of the solid-waste mixture-tailing filling cementing material are shown in table 2. Preparing test blocks according to the ash-sand ratio of 1:4,1:8 and 1:20, wherein the mass concentration of the slurry is 69%,71% and 73%, respectively, and measuring the corresponding uniaxial compressive strength of the filling body after curing for 28 d.
TABLE 2 solid waste mixture ratio-tailing filling cementing material strength (curing age 28 d)/MPa
When the mass concentration of the slurry is 73 percent and the ash-sand ratio is 1:4, the requirement that the compressive strength of the filling body is more than 4MPa can also be met. When the mass concentration of the slurry is 69% and the ash-sand ratio is 1:4, the requirement that the compressive strength of the filling body is more than 3MPa can be met.
Although the invention has been described in detail hereinabove with respect to a general description and specific embodiments thereof, it will be apparent to those skilled in the art that modifications or improvements may be made thereto based on the invention. Accordingly, such modifications and improvements are intended to be within the scope of the invention as claimed.
Claims (10)
1. A low-cost multi-source solid waste filling cementing material is characterized by comprising the following components in percentage by weight: 8-15% of desulfurized gypsum, 5-10% of quicklime, 15-25% of desulfurized ash, 50-65% of slag, 0-5% of waste glass and 0-5% of coal cinder.
2. The low-cost solid waste filling cementing material of claim 1, which is characterized by comprising the following components in percentage by weight: 12 to 15 percent of desulfurized gypsum, 7 to 10 percent of quicklime, 15 to 20 percent of desulfurized ash, 53 to 58 percent of slag, 2 to 5 percent of waste glass and 2 to 4 percent of coal cinder;
preferably, the composition consists of the following components in percentage by weight: 8-10% of desulfurized gypsum, 9-10% of quicklime, 15-20% of desulfurized ash, 55-58% of slag, 4-5% of waste glass and 2-4% of coal cinder; the specific surface area of each component is preferably 320-450 m 2 /kg。
3. The low-cost multi-source solid waste filling cementitious material of claim 2, wherein the slag is selected from one or more of water quenched blast furnace iron making slag, water quenched ferromanganese, steel slag, preferably water quenched blast furnace iron making slag; the slag comprises the following components in parts by mass: caO 40-50%, siO 2 20～30％，Al 2 O 3 10～20％，MgO 4～10％，Fe 2 O 3 1 to 2 percent; preferably, the alkalinity coefficient Mo of the slag is 1-1.4, the mass coefficient k is more than or equal to 1.2, and the activity coefficient>1。
4. The low-cost multi-source solid waste packing cementitious material according to any one of claims 1 to 3, wherein the desulfurized ash comprises the following components in percentage by mass: siO 2 2 20～30％，Al 2 O 3 10～20％，CaO 5～10％、SO 3 10～15％、Fe 2 O 3 1 to 5 percent and MgO 1 to 4 percent.
5. The low-cost multi-source solid waste filling cementing material according to any one of the claims 1 to 4, characterized in that the desulfurized gypsum is industrial by-product gypsum obtained by treating sulfur dioxide in coal-fired or fuel oil flue gas; the main chemical component of the desulfurized gypsum is preferably calcium sulfate dihydrate crystal CaSO 4 ·2H 2 O，SO 3 The content of (b) is preferably 25% to 46%; preferably, the desulfurized gypsum comprises the following components in percentage by mass: siO 2 2 1～5％，Al 2 O 3 0～2％，Fe 2 O 3 0～1％，CaO 30～33％、SO 3 40-45 percent of the components.
6. The low-cost multi-source solid waste filling cementing material according to any one of the claims 1 to 5, wherein the coal cinder comprises the following components in percentage by mass: siO 2 2 70～80％，Al 2 O 3 5～10％，CaO 1～4％，MgO 1～4％，Fe 2 O 3 2 to 10% and SO 3 0 to 2 percent and the loss on ignition is 1 to 4 percent.
7. The low-cost multi-source solid waste filling cementitious material according to any one of claims 1 to 6, characterized in that the waste glass comprises the following components in percentage by mass: siO 2 2 70～80％，Al 2 O 3 0～5％，CaO 0～4％，MgO 10～20％，Fe 2 O 3 0 to 1 percent of the composition.
8. The low-cost multi-source solid waste filling cementing material according to any one of the claims 1 to 7, characterized in that the main chemical component of the quicklime is CaO, preferably the CaO mass fraction is more than 85%.
9. The preparation method of the low-cost multi-source solid waste filling cementing material of any one of the claims 1 to 8, which is characterized by comprising the following steps: grinding the desulfurized gypsum, the quicklime, the desulfurized fly ash, the slag, the waste glass and the coal cinder according to the proportion; preferably grinding until the Bo's specific surface area is 320-450m 2 (iv) kg; preferably, the method comprises the following steps:
1) Drying the desulfurized gypsum, the quicklime, the desulfurized ash, the slag and the coal cinder at the temperature of between 90 and 100 ℃ preferably;
2) Roughly crushing waste glass, wherein the particle size of the roughly crushed waste glass is less than 5mm, preferably 2-5 mm;
3) Mixing the desulfurized gypsum, the quicklime, the desulfurized ash, the slag, the cinder and the waste glass obtained in the steps 1) and 2) according to the weight ratio to obtain a mixture proportioning material;
4) Ball-milling the mixed proportioning material obtained in the step 3), preferably grinding until the Bosch specific surface area is 320-450 m 2 /kg；
Or step 3) is: respectively grinding the desulfurized gypsum, the quicklime, the desulfurized ash, the slag, the cinder and the waste glass obtained in the steps 1) and 2) until the specific Bosch surface area is 320-450 m 2 And/kg, and then mixing uniformly.
10. Use of the low-cost multisource solid waste filling cementitious material according to any one of claims 1 to 8 or the method for preparing the low-cost multisource solid waste filling cementitious material according to claim 9, characterized in that the low-cost multisource solid waste filling cementitious material is used for mine filling, preferably coal mine underground goaf filling; preferably, the low-cost multisource solid waste filling cementing material is used as a cementing material to be mixed with coarse aggregate and water to form a filling body; preferably, the coarse aggregate is tailings and/or coal gangue, and the coarse aggregate is preferably tailings; more preferably, the mass ratio of the low-cost multi-source solid waste filling cementing material to the coarse aggregate is 1; the mass concentration of the slurry is 69-73%.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116947449A (en) * | 2023-08-16 | 2023-10-27 | 济宁学院 | Filling slurry prepared from multi-source solid waste material and preparation method thereof |
| CN116947449B (en) * | 2023-08-16 | 2024-02-06 | 济宁学院 | Filling slurry prepared from multi-source solid waste material and preparation method thereof |
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