CN117756487B - Lithium slag cementing material and preparation method thereof - Google Patents
Lithium slag cementing material and preparation method thereof Download PDFInfo
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- CN117756487B CN117756487B CN202311719222.4A CN202311719222A CN117756487B CN 117756487 B CN117756487 B CN 117756487B CN 202311719222 A CN202311719222 A CN 202311719222A CN 117756487 B CN117756487 B CN 117756487B
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- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 title claims abstract description 63
- 229910052744 lithium Inorganic materials 0.000 title claims abstract description 63
- 239000002893 slag Substances 0.000 title claims abstract description 63
- 239000000463 material Substances 0.000 title claims abstract description 51
- 238000002360 preparation method Methods 0.000 title claims abstract description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 46
- 239000004568 cement Substances 0.000 claims abstract description 35
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 30
- 239000002245 particle Substances 0.000 claims abstract description 28
- 229920002748 Basalt fiber Polymers 0.000 claims abstract description 22
- 239000003245 coal Substances 0.000 claims abstract description 19
- 229910021487 silica fume Inorganic materials 0.000 claims abstract description 19
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 16
- 239000002994 raw material Substances 0.000 claims abstract description 16
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 15
- BOTDANWDWHJENH-UHFFFAOYSA-N Tetraethyl orthosilicate Chemical compound CCO[Si](OCC)(OCC)OCC BOTDANWDWHJENH-UHFFFAOYSA-N 0.000 claims abstract description 12
- 238000006243 chemical reaction Methods 0.000 claims abstract description 7
- 238000002156 mixing Methods 0.000 claims description 21
- 239000004576 sand Substances 0.000 claims description 14
- 239000004575 stone Substances 0.000 claims description 14
- GSEJCLTVZPLZKY-UHFFFAOYSA-N Triethanolamine Chemical compound OCCN(CCO)CCO GSEJCLTVZPLZKY-UHFFFAOYSA-N 0.000 claims description 9
- 238000000498 ball milling Methods 0.000 claims description 9
- 238000000034 method Methods 0.000 claims description 7
- 239000002910 solid waste Substances 0.000 abstract description 11
- 239000010703 silicon Substances 0.000 abstract description 8
- 229910052710 silicon Inorganic materials 0.000 abstract description 8
- 230000000694 effects Effects 0.000 abstract description 4
- 238000006703 hydration reaction Methods 0.000 abstract description 4
- AZDRQVAHHNSJOQ-UHFFFAOYSA-N alumane Chemical class [AlH3] AZDRQVAHHNSJOQ-UHFFFAOYSA-N 0.000 abstract description 3
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 abstract description 3
- 239000000920 calcium hydroxide Substances 0.000 abstract description 3
- 229910001861 calcium hydroxide Inorganic materials 0.000 abstract description 3
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 abstract description 3
- 239000000292 calcium oxide Substances 0.000 abstract description 3
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 abstract description 3
- 239000000378 calcium silicate Substances 0.000 abstract description 3
- 229910052918 calcium silicate Inorganic materials 0.000 abstract description 3
- OYACROKNLOSFPA-UHFFFAOYSA-N calcium;dioxido(oxo)silane Chemical compound [Ca+2].[O-][Si]([O-])=O OYACROKNLOSFPA-UHFFFAOYSA-N 0.000 abstract description 3
- XFWJKVMFIVXPKK-UHFFFAOYSA-N calcium;oxido(oxo)alumane Chemical compound [Ca+2].[O-][Al]=O.[O-][Al]=O XFWJKVMFIVXPKK-UHFFFAOYSA-N 0.000 abstract description 3
- 238000005336 cracking Methods 0.000 abstract description 2
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 abstract description 2
- 229910052814 silicon oxide Inorganic materials 0.000 abstract description 2
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 8
- 238000005406 washing Methods 0.000 description 8
- UFWIBTONFRDIAS-UHFFFAOYSA-N naphthalene-acid Natural products C1=CC=CC2=CC=CC=C21 UFWIBTONFRDIAS-UHFFFAOYSA-N 0.000 description 7
- 238000003756 stirring Methods 0.000 description 6
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 5
- 238000001035 drying Methods 0.000 description 4
- 238000001914 filtration Methods 0.000 description 4
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- 239000011230 binding agent Substances 0.000 description 3
- 230000001276 controlling effect Effects 0.000 description 3
- 239000003517 fume Substances 0.000 description 3
- 230000007935 neutral effect Effects 0.000 description 3
- 230000001105 regulatory effect Effects 0.000 description 3
- 239000003469 silicate cement Substances 0.000 description 3
- 239000008030 superplasticizer Substances 0.000 description 3
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 description 2
- 239000000654 additive Substances 0.000 description 2
- 230000000996 additive effect Effects 0.000 description 2
- 235000011114 ammonium hydroxide Nutrition 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- BHPQYMZQTOCNFJ-UHFFFAOYSA-N Calcium cation Chemical compound [Ca+2] BHPQYMZQTOCNFJ-UHFFFAOYSA-N 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- CSDREXVUYHZDNP-UHFFFAOYSA-N alumanylidynesilicon Chemical compound [Al].[Si] CSDREXVUYHZDNP-UHFFFAOYSA-N 0.000 description 1
- 238000010668 complexation reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 1
- 150000007529 inorganic bases Chemical class 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 230000002427 irreversible effect Effects 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 125000001624 naphthyl group Chemical group 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
Abstract
The invention belongs to the technical field of solid waste materials, and provides a lithium slag cementing material and a preparation method thereof, wherein the material comprises the following raw materials: cement, lithium slag, aggregate, a water reducing agent, a connecting agent, basalt fiber, silica fume and water. According to the invention, part of cement is replaced by lithium slag in the cementing material, and the lithium slag contains a large amount of silicon oxide and aluminum oxide, so that silicon and aluminum salts can react with calcium oxide or calcium hydroxide in the cement to generate hydrated calcium silicate or hydrated calcium aluminate gel, thereby improving the overall mechanical property of the concrete. And the addition of the lithium slag can surround the periphery of the cement particles to prevent the cement particles from reacting with water and slow down the hydration reaction, so that the heat release amount is reduced, and the initial cracking phenomenon caused by overhigh heat in the concrete is avoided. The connecting agent is prepared from coal gangue and tetraethoxysilane, so that volcanic ash reaction of lithium slag in a gelling system is promoted, hydration reaction activity of the lithium slag is improved, and the purpose of improving the strength of the gelling material is achieved.
Description
Technical Field
The invention relates to the technical field of solid waste materials, in particular to a lithium slag cementing material and a preparation method thereof.
Background
Concrete is a commonly used material in large-scale engineering, and has the characteristics of abundant raw materials, low price and simple production process. Meanwhile, the concrete has the characteristics of high compressive strength, good durability, wide strength grade range and the like, and the advantages lead the application range of the concrete to be very wide. However, as engineering requirements become higher, concrete materials prepared from simple cements cannot meet the requirements, so researchers are devoted to obtaining concrete with more excellent properties.
Meanwhile, the solid waste generated in the production operation is found to be increased, and if the solid waste is directly discharged into the natural environment, the environment is damaged in a large area; if piled up intensively, not only a lot of land resources are occupied, but also irreversible damage to the piled up land is generated. How to treat solid waste is thus also another problem in industry development.
Some researchers have found that part of the solid waste exhibits properties similar to cement, so how to configure the solid waste into concrete is a problem that needs to be solved at present.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides a lithium slag cementing material which is prepared from the following raw materials in parts by weight:
100-150 parts of cement, 50-80 parts of lithium slag, 330-500 parts of aggregate, 5-10 parts of water reducer, 38-56 parts of connecting agent, 10-15 parts of basalt fiber, 12-16 parts of silica fume and 50-70 parts of water.
Preferably, the particle size of the lithium slag is 4-6 μm;
Ball milling is carried out on the lithium slag before use, and the ball milling time is 30-50 min.
Preferably, the aggregate comprises river sand and crushed stone, and the mass ratio of the river sand to the crushed stone is 1:1.5 to 2;
The grain diameter of the river sand is 0.2-0.5 mm; the particle size of the crushed stone is 10-25 mm.
Preferably, the connecting agent is prepared from the following raw materials in percentage by mass:
Coal gangue: ethyl orthosilicate: the mass ratio of the triethanolamine is 8-12: 1-2: 0.5 to 0.8;
The particle size of the gangue is 1-2 mm.
Preferably, the preparation method of the connecting agent comprises the following steps:
Mixing coal gangue, ethyl orthosilicate, triethanolamine and water under alkaline condition, and reacting to obtain the connecting agent;
the pH value of the alkaline condition is 8-10;
the mass ratio of the coal gangue to the water is 8-12: 80-120;
the temperature of the reaction is 60-120 ℃; the time is 14-20 h.
Preferably, the basalt fiber has a diameter of 10-20 μm and a length of 5-10 mm;
The grain diameter of the silica fume is 0.1-0.5 mu m.
The invention also provides a preparation method of the lithium slag cementing material, which comprises the following steps:
(1) Mixing cement, lithium slag, aggregate, a connecting agent, basalt fiber and silica fume to obtain an intermediate material;
(2) And mixing the intermediate material, the water reducer and water to obtain the lithium slag cementing material.
Preferably, the rotational speed of the mixing in step (1) is 200 to 300rpm for 2 to 4 minutes.
Preferably, the rotational speed of the mixing in step (2) is 200 to 300rpm for 3 to 5 minutes.
In order to achieve the above object, the present invention provides the following technical solutions:
The invention provides a lithium slag cementing material, which comprises the following raw materials: cement, lithium slag, aggregate, a water reducing agent, a connecting agent, basalt fiber, silica fume and water. According to the invention, part of cement is replaced by lithium slag in the cementing material, and the lithium slag contains a large amount of silicon oxide and aluminum oxide, so that silicon and aluminum salts can react with calcium oxide or calcium hydroxide in the cement to generate hydrated calcium silicate or hydrated calcium aluminate gel, thereby improving the overall mechanical property of the concrete. And the addition of the lithium slag can surround the periphery of the cement particles to prevent the cement particles from reacting with water and slow down the hydration reaction, so that the heat release amount is reduced, and the initial cracking phenomenon caused by overhigh heat in the concrete is avoided.
According to the invention, the binder is added into the cementing material, the binder is prepared from coal gangue and tetraethoxysilane, the surface of the coal gangue contains a large number of hydroxyl groups, silicon element is introduced into the coal gangue through the tetraethoxysilane, the silicon element is fused into the coal gangue, the coal gangue with silicon hydroxyl on the surface is obtained, the coal gangue is introduced into the cementing material as the binder, the silicon hydroxyl can play a role of bonding and bridging with larger molecular weight, and the coal gangue has adsorption and complexation effects on liquid phase ions; and the introduction of the silicon element can further react with the calcium element to promote the volcanic ash reaction of the lithium slag in the gelling system, improve the hydration reaction activity of the lithium slag, and tightly connect the raw materials so as to achieve the aim of improving the strength of the gelling material.
Basalt fibers and silica fume are added into the cementing material; the basalt fibers are irregularly distributed in the cementing material, so that bridging connection effect is realized, and the strength and the compressive property of the cementing material are improved. The silica fume is used as another solid waste, which also contains elements such as silicon-aluminum, and the like, and can react with cement to improve the strength of the material.
The cementing material provided by the invention takes common solid waste as an additive, so that the consumption of cement is reduced, and the strength of the material is improved; the cost is greatly reduced, the process requirement is low, the material performance is high, and the method is suitable for large-scale popularization and application.
Detailed Description
The invention provides a lithium slag cementing material which is prepared from the following raw materials in parts by weight:
100-150 parts of cement, 50-80 parts of lithium slag, 330-500 parts of aggregate, 5-10 parts of water reducer, 38-56 parts of connecting agent, 10-15 parts of basalt fiber, 12-16 parts of silica fume and 50-70 parts of water.
In the present invention, the cement is preferably 110 to 140 parts by mass, more preferably 120 to 130 parts by mass, and still more preferably 125 to 128 parts by mass.
In the present invention, the mass fraction of the lithium slag is preferably 55 to 75 parts, more preferably 60 to 70 parts, and even more preferably 65 to 68 parts.
In the present invention, the mass fraction of the aggregate is preferably 350 to 450 parts, more preferably 360 to 440 parts, and still more preferably 380 to 420 parts.
In the present invention, the water reducing agent is preferably 6 to 9 parts by mass, more preferably 7 to 8 parts by mass, and still more preferably 7.2 to 7.5 parts by mass.
In the present invention, the mass part of the linking agent is preferably 40 to 55 parts, more preferably 45 to 50 parts, and still more preferably 47 to 48 parts.
In the present invention, the basalt fiber is preferably 11 to 14 parts by mass, more preferably 12 to 13 parts by mass, and still more preferably 12.5 to 12.6 parts by mass.
In the present invention, the silica fume is preferably 13 to 15 parts by mass, more preferably 13.5 to 14.5 parts by mass, and still more preferably 13.8 to 14 parts by mass.
In the present invention, the water is preferably 55 to 65 parts by mass, more preferably 56 to 64 parts by mass, and still more preferably 58 to 62 parts by mass.
In the present invention, the particle diameter of the lithium slag is preferably 4 to 6. Mu.m, more preferably 4.5 to 5.5. Mu.m, and still more preferably 4.8 to 5. Mu.m.
In the invention, the lithium slag is ball-milled before being used and is carried out in a planetary ball mill; the ball milling time is preferably 30 to 50 minutes, more preferably 35 to 45 minutes, and still more preferably 38 to 40 minutes.
In the invention, the ball milling aims to excite lithium slag and improve the strength of the cementing material.
In the invention, the aggregate comprises river sand and crushed stone, and the mass ratio of the river sand to the crushed stone is preferably 1:1.5 to 2, more preferably 1:1.6 to 1.9, more preferably 1:1.7 to 1.8.
In the present invention, the particle diameter of the river sand is preferably 0.2 to 0.5mm, more preferably 0.3 to 0.4mm, and still more preferably 0.35 to 0.38mm; the particle diameter of the crushed stone is preferably 10 to 25mm, more preferably 15 to 20mm, and even more preferably 18 to 19mm.
In the invention, the water reducer is naphthalene-based high-efficiency water reducer SNF-A.
In the invention, the connecting agent is prepared from the following raw materials in percentage by mass:
coal gangue: ethyl orthosilicate: the mass ratio of the triethanolamine is preferably 8-12: 1-2: 0.5 to 0.8, more preferably 9 to 11:1.2 to 1.8:0.6 to 0.7, more preferably 9.5 to 10:1.4 to 1.6:0.65 to 0.68.
In the present invention, the particle diameter of the gangue is preferably 1 to 2mm, more preferably 1.2 to 1.8mm, and still more preferably 1.4 to 1.6mm.
In the present invention, the preparation method of the connecting agent comprises the following steps:
And mixing coal gangue, ethyl orthosilicate, triethanolamine and water under alkaline condition, and reacting to obtain the connecting agent.
In the present invention, the pH of the alkaline condition is preferably 8 to 10, more preferably 8.5 to 9.5.
In the present invention, the adjustment of the alkaline conditions is carried out using a conventional inorganic base.
In the invention, the mass ratio of the coal gangue to the water is preferably 8-12: 80 to 120, more preferably 9 to 11:90 to 110, more preferably 9.5 to 10.5: 95-100.
In the present invention, the temperature of the reaction is preferably 60 to 120 ℃, more preferably 70 to 110 ℃, still more preferably 80 to 90 ℃; the time is preferably 14 to 20 hours, more preferably 15 to 19 hours, and still more preferably 16 to 18 hours.
In the present invention, after the reaction is completed, filtration, ethanol washing, water washing and drying are sequentially performed to obtain the connecting agent.
In the present invention, the basalt fiber preferably has a diameter of 10 to 20. Mu.m, more preferably 12 to 18. Mu.m, still more preferably 14 to 16. Mu.m; the length is preferably 5 to 10mm, more preferably 6 to 9mm, and even more preferably 7 to 8mm.
In the present invention, the particle size of the silica fume is preferably 0.1 to 0.5. Mu.m, more preferably 0.2 to 0.4. Mu.m, still more preferably 0.3 to 0.35. Mu.m.
The invention also provides a preparation method of the lithium slag cementing material, which comprises the following steps:
(1) Mixing cement, lithium slag, aggregate, a connecting agent, basalt fiber and silica fume to obtain an intermediate material;
(2) And mixing the intermediate material, the water reducer and water to obtain the lithium slag cementing material.
In the present invention, the rotational speed of the mixing in the step (1) is preferably 200 to 300rpm, more preferably 220 to 280rpm, still more preferably 240 to 260rpm; the time is preferably 2 to 4 minutes, more preferably 2.5 to 3.5 minutes, and still more preferably 2.8 to 3.2 minutes.
In the present invention, the rotational speed of the mixing in the step (2) is preferably 200 to 300rpm, more preferably 220 to 280rpm, still more preferably 240 to 260rpm; the time is preferably 3 to 5 minutes, more preferably 3.5 to 4.5 minutes, and still more preferably 3.8 to 4.2 minutes.
The technical solutions provided by the present invention are described in detail below with reference to examples, but they should not be construed as limiting the scope of the present invention.
Example 1
The cement is P.O42.5-grade silicate cement.
And (3) delivering the lithium slag into a planet ball mill for ball milling for 40min, and controlling the particle size of the lithium slag to be 5 mu m.
The particle size of the gangue is 1.5mm, and the mass ratio of the gangue to the tetraethoxysilane to the triethanolamine to the water is controlled to be 10:1.5:0.6:100; mixing the raw materials, regulating the pH value to 9 by using ammonia water, then reacting for 16 hours at 80 ℃, filtering, washing by ethanol, washing by water to be neutral, and drying to constant weight to obtain the connecting agent.
Preparing raw materials: 120 parts of cement, 60 parts of treated lithium slag, 400 parts of aggregate (the mass ratio of river sand to broken stone is 1:1.5, the particle size of the river sand is 0.4mm, the particle size of the broken stone is 15 mm), 8 parts of naphthalene-based superplasticizer SNF-A, 40 parts of Sub>A connecting agent, 14 parts of basalt fiber (the diameter is 15 mu m and the length is 8 mm), 14 parts of silicSub>A fume (the particle size is 0.3 mu m) and 60 parts of water.
Mixing cement, lithium slag, aggregate, a connecting agent, basalt fiber and silica fume, and stirring for 3min at 260 rpm; then adding the water reducer and water, and stirring for 5min under the condition of 260rpm to obtain the lithium slag cementing material.
Example 2
The cement is P.O42.5-grade silicate cement.
And (3) delivering the lithium slag into a planet ball mill for ball milling for 35min, and controlling the particle size of the lithium slag to be 4 mu m.
The particle size of the gangue is 1.2mm, and the mass ratio of the gangue to the tetraethoxysilane to the triethanolamine to the water is controlled to be 8:2:0.6:90; mixing the raw materials, regulating the pH value to 10 by using sodium hydroxide, then reacting for 15 hours at 120 ℃, filtering, washing by ethanol, washing by water to be neutral, and drying to constant weight to obtain the connecting agent.
Preparing raw materials: 110 parts of cement, 65 parts of treated lithium slag, 380 parts of aggregate (the mass ratio of river sand to broken stone is 1:2, the grain size of the river sand is 0.3mm, the grain size of the broken stone is 10 mm), 6 parts of naphthalene-based superplasticizer SNF-A, 50 parts of connecting agent, 10 parts of basalt fiber (with the diameter of 20 mu m and the length of 10 mm), 16 parts of silicSub>A fume (with the grain size of 0.1 mu m) and 70 parts of water.
Mixing cement, lithium slag, aggregate, a connecting agent, basalt fiber and silica fume, and stirring for 4min at 300 rpm; then adding the water reducer and water, and stirring for 4min under the condition of 300rpm to obtain the lithium slag cementing material.
Example 3
The cement is P.O42.5-grade silicate cement.
And (3) delivering the lithium slag into a planet ball mill for ball milling for 50min, and controlling the particle size of the lithium slag to be 5.5 mu m.
The particle size of the coal gangue is 2mm, and the mass ratio of the coal gangue to the tetraethoxysilane to the triethanolamine to the water is controlled to be 11:1.4:0.7:120; mixing the raw materials, regulating the pH value to 8 by using ammonia water, then reacting for 16 hours at the temperature of 110 ℃, filtering, washing by ethanol, washing by water to be neutral, and drying to constant weight after the reaction is finished to obtain the connecting agent.
Preparing raw materials: 120 parts of cement, 68 parts of treated lithium slag, 420 parts of aggregate (the mass ratio of river sand to broken stone is 1:1.9, the particle size of the river sand is 0.4mm, the particle size of the broken stone is 15 mm), 8 parts of naphthalene-based superplasticizer SNF-A, 43 parts of connecting agent, 12 parts of basalt fiber (diameter 18 mu m, length 8 mm), 13 parts of silicSub>A fume (particle size 0.4 mu m) and 60 parts of water.
Mixing cement, lithium slag, aggregate, a connecting agent, basalt fiber and silica fume, and stirring for 3min at 140 rpm; then adding the water reducer and water, and stirring for 4min under the condition of 280rpm to obtain the lithium slag cementing material.
The lithium slag cementing materials obtained in examples 1 to 3 were subjected to standard curing according to GB/T50081-2019 Standard of ordinary concrete mechanical Property experiment method, and after 28 days, the compressive strength and flexural Strength were measured, and the results are recorded in Table 1.
Table 1 test results
| Compressive strength (MPa) | Flexural strength (MPa) | |
| Example 1 | 65.3 | 8.2 |
| Example 2 | 62.7 | 8.0 |
| Example 3 | 63.5 | 7.9 |
From the above examples, the present invention provides a lithium slag gelling material, which comprises the following raw materials: cement, lithium slag, aggregate, a water reducing agent, a connecting agent, basalt fiber, silica fume and water. According to the invention, part of cement is replaced by lithium slag in the cementing material, and silicon and aluminum salts in the lithium slag can react with calcium oxide or calcium hydroxide in the cement to generate hydrated calcium silicate or hydrated calcium aluminate gel, so that the overall mechanical property of the concrete is improved. The addition of the connecting agent, basalt fiber and silica fume also improves the performance of the cementing material. The invention takes common solid waste as an additive, so that the consumption of cement is reduced, and the strength of the material is improved; the cost is greatly reduced, the process requirement is low, the material performance is high, the compressive strength reaches 65.3MPa in 28 days and the flexural strength reaches 8.2MPa after the test, and the solid waste cementing material is excellent in performance.
The foregoing is merely a preferred embodiment of the present invention and it should be noted that modifications and adaptations to those skilled in the art may be made without departing from the principles of the present invention, which are intended to be comprehended within the scope of the present invention.
Claims (7)
1. The lithium slag cementing material is characterized by being prepared from the following raw materials in parts by weight:
100-150 parts of cement, 50-80 parts of lithium slag, 330-500 parts of aggregate, 5-10 parts of water reducer, 38-56 parts of connecting agent, 10-15 parts of basalt fiber, 12-16 parts of silica fume and 50-70 parts of water;
The preparation method of the connecting agent comprises the following steps:
Under alkaline condition, mixing coal gangue, tetraethoxysilane, triethanolamine and water, and reacting to obtain the connecting agent;
the pH value of the alkaline condition is 8-10;
The mass ratio of the coal gangue to the tetraethoxysilane to the triethanolamine to the water is 8-12: 1-2: 0.5 to 0.8: 80-120 parts;
the particle size of the coal gangue is 1-2 mm;
The temperature of the reaction is 60-120 ℃; the time is 14-20 h.
2. The lithium slag cementing material of claim 1, wherein the particle size of the lithium slag is 4-6 μm;
Ball milling is carried out on the lithium slag before use, and the ball milling time is 30-50 min.
3. The lithium slag cement according to claim 1 or 2, wherein the aggregate comprises river sand and crushed stone in a mass ratio of 1: 1.5-2;
The grain size of the river sand is 0.2-0.5 mm; the particle size of the broken stone is 10-25 mm.
4. The lithium slag cementing material of claim 3, wherein the basalt fiber has a diameter of 10-20 μm and a length of 5-10 mm;
the particle size of the silica fume is 0.1-0.5 mu m.
5. The method for preparing the lithium slag cementing material according to any one of claims 1 to 4, which is characterized by comprising the following steps:
(1) Mixing cement, lithium slag, aggregate, a connecting agent, basalt fiber and silica fume to obtain an intermediate material;
(2) And mixing the intermediate material, the water reducer and water to obtain the lithium slag cementing material.
6. The method according to claim 5, wherein the rotational speed of the mixing in the step (1) is 200 to 300rpm for 2 to 4 minutes.
7. The method according to claim 5 or 6, wherein the rotation speed of the mixing in the step (2) is 200 to 300rpm for 3 to 5 minutes.
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| CN202311719222.4A CN117756487B (en) | 2023-12-14 | Lithium slag cementing material and preparation method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311719222.4A CN117756487B (en) | 2023-12-14 | Lithium slag cementing material and preparation method thereof |
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| CN117756487A CN117756487A (en) | 2024-03-26 |
| CN117756487B true CN117756487B (en) | 2024-06-25 |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112521067A (en) * | 2020-12-28 | 2021-03-19 | 汪峻峰 | Acid-alkali corrosion resistant alkali-activated concrete material and preparation method thereof |
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112521067A (en) * | 2020-12-28 | 2021-03-19 | 汪峻峰 | Acid-alkali corrosion resistant alkali-activated concrete material and preparation method thereof |
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