CN116003020A - Mineral admixture for high-performance green concrete and preparation method thereof - Google Patents
Mineral admixture for high-performance green concrete and preparation method thereof Download PDFInfo
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- 239000004567 concrete Substances 0.000 title claims abstract description 55
- 229910052500 inorganic mineral Inorganic materials 0.000 title claims abstract description 52
- 239000011707 mineral Substances 0.000 title claims abstract description 52
- 238000002360 preparation method Methods 0.000 title description 12
- 239000002893 slag Substances 0.000 claims abstract description 165
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 claims abstract description 72
- 229910052744 lithium Inorganic materials 0.000 claims abstract description 72
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 46
- 239000010959 steel Substances 0.000 claims abstract description 46
- 238000000227 grinding Methods 0.000 claims abstract description 44
- 238000000034 method Methods 0.000 claims abstract description 30
- 239000002699 waste material Substances 0.000 claims abstract description 29
- 239000010881 fly ash Substances 0.000 claims abstract description 28
- 239000000843 powder Substances 0.000 claims abstract description 28
- 239000004568 cement Substances 0.000 claims abstract description 26
- 229920005610 lignin Polymers 0.000 claims abstract description 16
- 230000008569 process Effects 0.000 claims abstract description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 19
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 18
- MUBZPKHOEPUJKR-UHFFFAOYSA-N Oxalic acid Chemical compound OC(=O)C(O)=O MUBZPKHOEPUJKR-UHFFFAOYSA-N 0.000 claims description 15
- 238000007885 magnetic separation Methods 0.000 claims description 13
- 239000000463 material Substances 0.000 claims description 13
- 239000011812 mixed powder Substances 0.000 claims description 12
- 239000000654 additive Substances 0.000 claims description 11
- 230000000996 additive effect Effects 0.000 claims description 11
- 238000006477 desulfuration reaction Methods 0.000 claims description 11
- 230000023556 desulfurization Effects 0.000 claims description 11
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims description 10
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims description 10
- 238000010438 heat treatment Methods 0.000 claims description 10
- 230000009467 reduction Effects 0.000 claims description 10
- 239000011593 sulfur Substances 0.000 claims description 10
- 229910052717 sulfur Inorganic materials 0.000 claims description 10
- 229910018072 Al 2 O 3 Inorganic materials 0.000 claims description 8
- 239000000203 mixture Substances 0.000 claims description 8
- 239000011734 sodium Substances 0.000 claims description 6
- 238000003756 stirring Methods 0.000 claims description 6
- 235000019738 Limestone Nutrition 0.000 claims description 5
- 230000003009 desulfurizing effect Effects 0.000 claims description 5
- 238000001035 drying Methods 0.000 claims description 5
- 229910052742 iron Inorganic materials 0.000 claims description 5
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N iron oxide Inorganic materials [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 claims description 5
- 239000006028 limestone Substances 0.000 claims description 5
- 235000006408 oxalic acid Nutrition 0.000 claims description 5
- NDLPOXTZKUMGOV-UHFFFAOYSA-N oxo(oxoferriooxy)iron hydrate Chemical compound O.O=[Fe]O[Fe]=O NDLPOXTZKUMGOV-UHFFFAOYSA-N 0.000 claims description 5
- 239000010802 sludge Substances 0.000 claims description 5
- 229910000029 sodium carbonate Inorganic materials 0.000 claims description 5
- GSEJCLTVZPLZKY-UHFFFAOYSA-N Triethanolamine Chemical compound OCCN(CCO)CCO GSEJCLTVZPLZKY-UHFFFAOYSA-N 0.000 claims description 2
- 238000011112 process operation Methods 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 14
- 238000001514 detection method Methods 0.000 abstract description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract 1
- 229910052799 carbon Inorganic materials 0.000 abstract 1
- 230000000295 complement effect Effects 0.000 abstract 1
- 238000005265 energy consumption Methods 0.000 abstract 1
- 239000002910 solid waste Substances 0.000 abstract 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 6
- AKEJUJNQAAGONA-UHFFFAOYSA-N sulfur trioxide Chemical compound O=S(=O)=O AKEJUJNQAAGONA-UHFFFAOYSA-N 0.000 description 6
- 230000001276 controlling effect Effects 0.000 description 4
- 238000002474 experimental method Methods 0.000 description 4
- 230000036571 hydration Effects 0.000 description 4
- 238000006703 hydration reaction Methods 0.000 description 4
- 238000010276 construction Methods 0.000 description 3
- 239000002440 industrial waste Substances 0.000 description 3
- 230000001603 reducing effect Effects 0.000 description 3
- 239000004576 sand Substances 0.000 description 3
- 239000004927 clay Substances 0.000 description 2
- 239000002002 slurry Substances 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 229910000863 Ferronickel Inorganic materials 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 239000011324 bead Substances 0.000 description 1
- 239000011449 brick Substances 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 1
- 239000000920 calcium hydroxide Substances 0.000 description 1
- 229910001861 calcium hydroxide Inorganic materials 0.000 description 1
- 239000000378 calcium silicate Substances 0.000 description 1
- 229910052918 calcium silicate Inorganic materials 0.000 description 1
- OYACROKNLOSFPA-UHFFFAOYSA-N calcium;dioxido(oxo)silane Chemical compound [Ca+2].[O-][Si]([O-])=O OYACROKNLOSFPA-UHFFFAOYSA-N 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 229910001653 ettringite Inorganic materials 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 230000000979 retarding effect Effects 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 229910052814 silicon oxide Inorganic materials 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Landscapes
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The mineral admixture for the high-performance green concrete comprises a waste residue component, a grinding aid and lignin, wherein the waste residue component comprises 40-90% of lithium slag and 10-50% of blast furnace slag by mass percent; the grinding aid accounts for 0.4 to 0.6 per mill of the total amount of the waste residue components; lignin accounts for 1 to 3 per mill of the total amount of the waste residue components. Preferably, the waste residue component further comprises steel slag or fly ash (grade ii): when the slag is included, the slag is not more than 20% of the total amount of slag components in percentage by mass; when fly ash is included: the mass percentage of the fly ash is not more than 30 percent of the total amount of the waste residue components. The invention fully utilizes the solid waste to process and produce the admixture, all the components complement each other, the produced admixture has better performance, can reach the detection standard of high-quality mineral powder, and can reach the performance close to or even exceeding cement; the activity index is higher, more cement can be replaced, and the energy consumption and the carbon emission are reduced.
Description
Technical Field
The invention relates to the technical field of building materials, in particular to a mineral admixture for high-performance green concrete and a preparation method thereof.
Background
In order to reduce the consumption of natural resources and maintain ecological environment to the maximum extent, green concrete is a necessary choice for the development of concrete materials. The mineral admixture is an important component of green concrete, and the scientific and reasonable use of the mineral admixture not only can reduce the amount of ground cement in the concrete, but also can improve certain properties of the concrete. Meanwhile, the problem that the treated waste residue occupies land and pollutes environment can be solved by utilizing the industrial waste residue to prepare the mineral admixture.
The mineral admixture which is mature in the prior art is used in concrete and comprises fly ash, granulated blast furnace slag powder, silica powder and the like; a great number of novel mineral admixtures are being tried to be applied to concrete, and the feasibility of the novel mineral admixtures with larger annual discharge amount in China, such as ferronickel slag powder, steel slag powder, phosphorus slag powder and the like, and the influence on the performance of the concrete are studied in the novel mineral admixtures for green concrete published by China building industry Press 2017.12. Different industrial waste residues have different components, and when the method is applied to the mineral admixture, the positive effect and the adverse effect on the concrete performance are different, and how to efficiently utilize the industrial waste residues to prepare the mineral admixture needs to be specifically developed and researched according to specific waste residue types.
Along with popularization of new energy markets, the demand of lithium batteries is rapidly increased, and green treatment of lithium slag also becomes an urgent problem to be solved. At present, the lithium slag is mainly buried after garbage is transported away, the mode can pollute water sources and environment, and the treatment cost is high. A small part of lithium slag can be used for producing building blocks, bricks and the like to act like sand; al in lithium slag chemical composition 2 O 3 、SiO 2 、SO 3 The content is higher, the CaO content is less, and the content is similar to the clay composition for producing cement, so that partial lithium slag is used for replacing clay to produce cement, but the application utilization rate is low, the consumption is low, and the rapidly-growing lithium slag treatment requirement cannot be met.
Disclosure of Invention
The invention aims to provide a mineral admixture for high-performance green concrete and a preparation method thereof, and the formula of the mineral admixture for high-performance green concrete utilizes lithium slag according to the characteristics of the lithium slagThe mineral admixture for producing green concrete improves the performance of the concrete; the micro filling effect and the ball effect of the lithium slag are utilized to reduce the water consumption of the concrete and improve the early-stage and later-stage strength of the concrete; the characteristics of high content of silicon oxide and aluminum oxide in lithium slag and high activity are utilized to reduce the use of cement; by using small amounts of SO contained in the lithium slag 3 Ettringite generated by hydration products of cement is filled in the concrete, so that the compactness of the concrete is improved; the lithium slag reacts with calcium hydroxide and calcium silicate serving as cement hydration products, so that the C-S-H gel amount is increased, and the strength of the concrete is improved; the three-blending compound use of blast furnace slag, reconstructed converter slag and lithium slag ensures that the pore structure of the concrete is fully refined and the strength of the concrete is obviously improved; the hydration heat is reduced by using the lithium slag mineral admixture, and the durability and the safety of the concrete are ensured. The utilization rate of lithium slag is improved, waste is changed into valuable, and the economic value is improved.
The technical scheme of the invention is that the mineral admixture for the high-performance green concrete comprises a waste residue component, a grinding aid and lignin, wherein the waste residue component comprises 40-90% of lithium slag and 10-50% of blast furnace slag by mass percent; preferably, the waste residue component further comprises steel slag or fly ash (grade ii): when the slag is included, the slag is not more than 20% of the total amount of slag components in percentage by mass; when fly ash is included: the mass percentage of the fly ash is not more than 30 percent of the total amount of the waste residue components. The grinding aid accounts for 0.4 to 0.6 per mill of the total amount of the waste residue components; the lignin accounts for 1 to 3 per mill of the total amount of the waste residue components.
The blast furnace slag has higher activity strength, and a certain proportion of blast furnace slag (10-50%) is required to be referenced according to the activity strength requirement when the mineral admixture is prepared. To further excite the activity intensity of the blast furnace slag, the blast furnace slag is ground into powder with the specific surface area of 500 to 600m 2 Between/kg, the activity intensity can be improved to about 115%;
steel slag is an industrial slag produced during steelmaking and is typically 15% of the yield of raw steel. The invention combines the advantages of good compressive property (crushing value is 20.4-30.8%) of steel slag, and experiments show that as the specific surface area of steel slag powder increases, the water consumption of standard consistency is smaller and smaller, and the water consumption when the steel slag pure slurry with different specific surface areas reaches the standard consistency state is shown in the following table 1, which shows that the ground steel slag powder has a certain water reducing effect. Matching with lithium slag, the problem of poor fluidity of lithium slag can be solved under the condition of not reducing the strength. According to the monitoring of the stability of the steel slag (standard is +.
5 mm), the mass percentage of the components is not more than 20 percent. The activity strength of the compounded mineral admixture reaches the S95 mineral powder standard.
TABLE 1 Water demand for different specific surface areas of Steel slag slurries to reach Standard consistency
| Sequence number | Specific surface area of steel slag (M2/kg) | Water demand/g for the net pulp to reach standard consistency | The clear pulp reaches the water-gel ratio of standard consistency |
| 1 | 400 | 119 | 0.238 |
| 2 | 500 | 118 | 0.236 |
| 3 | 600 | 116 | 0.230 |
| 4 | 700 | 114 | 0.228 |
The fly ash (class II) contains more than 70% of glass beads, has complete particle shape, smooth surface and compact texture, and has good water reducing, compacting and homogenizing effects. After the mineral admixture is compounded with the lithium slag and the blast furnace slag, the rheological property, the initial structure and the hardened functions of the admixture can be changed, the deflocculating effect of the hydration of the initial cement is promoted, the slump loss is reduced for the pumped concrete, and the pumping pouring is easy. However, the loss on ignition of the fly ash is 3.2, and the mass percent of the components is not more than 30 percent according to the mineral powder inspection standard. The activity intensity of the fly ash is not high, about 70%, and the activity intensity of the compounded mineral admixture reaches the S75 mineral powder standard.
Further, the lithium slag comprises the following components in percentage by mass: siO (SiO) 2 ：57；Al 2 O 3 ：22.2；Fe 2 O 3 ：1.4；CaO：4.2；MgO：0.9；SO 3 ：6.2；Cl - ：0.01。
Further, the fly ash (class II) comprises the following components in percentage by mass: siO (SiO) 2 ：55.36；Al 2 O 3 ：28.2；Fe 2 O 3 ：5.59；CaO：1.71；MgO：1.81；SO 3 ：1.3；Na 2 O：0.4；Cl - :0.01. the loss on ignition of the fly ash is 3.2%.
Further, the steel slag comprises the following components in percentage by mass: siO (SiO) 2 ：16.13；Al 2 O 3 ：9.65；Fe 2 O 3 ：23.00；CaO：36.99；MgO：10.43；SO 3 ：0.26；K 2 O：1.12；Na 2 O：0.31。
Further, the blast furnace slag comprises the following components in percentage by mass: siO (SiO) 2 ：33.4；Al 2 O 3 ：15.2；Fe 2 O 3 ：1；CaO：39.4；MgO：6.2；SO 3 ：0.12；K 2 O：0.42；Na 2 O：0.11。
Further, the grinding aid is triethanolamine.
Furthermore, lignin is a water reducing agent, so that the fluidity of the product can be greatly improved;
the invention also provides a preparation method of the mineral admixture for the high-performance green concrete, which is selected from one of the following methods one or two.
The first method comprises the following steps:
s1, sulfur reduction treatment of lithium slag: adding a desulfurization additive accounting for 2-6% of the weight of the lithium slag into the lithium slag, heating the lithium slag to 300-600 ℃ in a rotary kiln, performing heat treatment for 0.5-1h, dehydrating and desulfurizing the lithium slag, and improving the pH value to 8-10, wherein SO in the lithium slag is obtained after the sulfur reduction treatment 3 The content of (2) is controlled within 3.5%; the desulfurization additive consists of the following components in percentage by weight: 20-25% of limestone, 55-60% of sludge, 15-20% of sodium carbonate and 3-5% of oxalic acid;
s2, drying and controlling the water content of the lithium slag and the blast furnace slag to be below 1%;
s3, primary grinding of blast furnace slag is carried out;
s4, adding a grinding aid to carry out two-stage superfine grinding on the mixed powder of the lithium slag obtained in the step S2 and the blast furnace slag obtained in the step S3;
and S5, uniformly stirring the superfine powder obtained in the step S4 and lignin by a stirrer.
The preferred scheme in the method one comprises the following steps:
when the slag component comprises steel slag, the water content of the steel slag is controlled to be less than 1% in the step S2, primary grinding and magnetic separation are carried out in the step S3, and the steel slag is added as a mixed powder component in the step S4;
the technological parameters of a primary grinding in the step S3 are as follows: the specific surface of the powder to be ground is made by adopting a grinding processThe product is controlled to be 300-350m 2 The specific surface area control method comprises the following steps of: using a cement fineness negative pressure screen analyzer, controlling the negative pressure to 5500-6000Pa, wherein the aperture of the cement fineness negative pressure screen analyzer is 0.08mm, and the screen residue is less than or equal to 2%;
the method for magnetic separation and iron removal of the steel slag comprises the following steps: a magnetic disk with the width consistent with the width of the belt of the conveying material is arranged 0.5 m above the belt of the conveying material of the steel slag after grinding, and the ferric oxide content of the steel slag is controlled to be less than or equal to 10% by three sections of magnetic separation at the front end, the middle end and the tail end of the conveying belt;
when the waste residue component comprises fly ash (class II), the fly ash is added as a mixed powder component in the step S4;
the second method comprises the following steps:
s1, sulfur reduction treatment of lithium slag: adding a desulfurization additive accounting for 2-6% of the weight of the lithium slag into the lithium slag, heating the lithium slag to 300-600 ℃ in a rotary kiln, performing heat treatment for 0.5-1h, dehydrating and desulfurizing the lithium slag, and improving the pH value to 8-10, wherein SO in the lithium slag is obtained after the sulfur reduction treatment 3 The content of (2) is less than or equal to 3.5%; the desulfurization additive consists of the following components in percentage by weight: 20-25% of limestone, 55-60% of sludge, 15-20% of sodium carbonate and 3-5% of oxalic acid;
s2, drying the water content of the lithium slag and the blast furnace slag to be less than or equal to 1 percent;
s3, adding a grinding aid to enable the mixture of the powder obtained in the step S2 to enter a vertical mill for grinding until the surface area is within a preset range;
and S4, uniformly stirring the superfine powder obtained in the step S3 and lignin by a stirrer.
The preferred scheme in the second method comprises the following steps:
when the slag component comprises steel slag, the water content of the steel slag is dried to be less than or equal to 1% in the step S2, and the steel slag is added as a mixed powder component in the step S3;
the process operation and parameters of step S2 are: the specific surface area of the material to be milled is controlled to be 300-350m 2 The surface area control method is that the negative pressure is controlled to 5500-6000Pa by a cement fineness negative pressure screen analyzer, the aperture of the cement fineness negative pressure screen analyzer is 0.08mm, and the screen residue is less than or equal to 2%;
the method for magnetic separation and iron removal of the steel slag comprises the following steps: a magnetic disk with the width consistent with the width of the belt of the conveying material is arranged 0.5 m above the belt of the conveying material of the steel slag after grinding, and the ferric oxide content of the steel slag is controlled to be less than or equal to 10% by three sections of magnetic separation at the front end, the middle end and the tail end of the conveying belt;
when the waste residue component comprises fly ash (class II), the fly ash is added as a mixed powder component in the step S3;
the powder grinding adopts a vertical mill or a superfine ball mill.
Compared with the prior art, the invention has the advantages that:
1. the mineral admixture has stable components and use performance; slag composition and use performance stability (the product and raw materials pass through a plurality of detection mechanisms for detecting the composition and the use performance for many times in recent years) experimental data.
2. The mineral admixture has better strength growth in later period. The strength increase experimental data from 28 days to 56 days through the sand test block experiment show that: the reference cement increased by about 6 mpa and the product increased by about 8 mpa. In addition, according to the concrete trial-mix comparison experiment with S95 mineral powder, the strength of the product is increased by about 1.5 megapascals higher than that of S95 mineral powder in 28 days to 56 days.
3. The product has good concrete construction performance, cohesiveness and water retention property which are obviously better than those of S95 grade mineral powder.
4. The product has good retarder and slump retaining performance (the initial setting time of the detection gel sand is about 140 percent, and a concrete slump loss test is carried out, which is about 15 minutes later than a reference); according to the requirements of the national standard GB/T18046-2017 on the sulfur trioxide content not more than 4%, the sulfur trioxide content of the prepared product meets the national standard, and meanwhile, the product has a retarding effect on cement products, namely, the setting time of cement is regulated and controlled, and the proper amount of sulfur trioxide content retards the setting of the cement, so that the working procedures of stirring, transportation, vibrating, masonry and the like in the construction are smoothly carried out, and the influence of the cement on the construction due to rapid setting is prevented.
5. The product makes the surface of the concrete product smoother, and the appearance quality is better (the fine specific surface area of the product is 500-600 m < 2 >/kg, the viscosity is good, and the gap on the surface of the concrete product can be smoothed);
6. the invention greatly improves the utilization rate of lithium slag.
Table one: concrete proportioning experiment
And (II) table: concrete measured performance data
The product composition of the invention can be combined into various formulas, and the product can reach the national standard of S75 and S95 mineral powder.
Detailed Description
In order that those skilled in the art will better understand the present invention, the present invention will be described in further detail with reference to specific embodiments.
Example 1
The mineral admixture for the high-performance green concrete comprises the following components in percentage by mass: 90 parts of lithium slag, 10 parts of blast furnace slag, 0.4 per mill of grinding aid and 3 per mill of lignin accounting for the total mass of the lithium slag and the blast furnace slag.
The preparation method comprises the following steps:
s1, sulfur reduction treatment of lithium slag: adding a desulfurization additive accounting for 2-6% of the weight of the lithium slag into the lithium slag, heating the lithium slag to 300-600 ℃ in a rotary kiln, performing heat treatment for 0.5-1h, dehydrating and desulfurizing the lithium slag, and improving the pH value to 8-10, wherein SO in the lithium slag is obtained after the sulfur reduction treatment 3 The content of (2) is controlled within 3.5%; the desulfurization additive consists of the following components in percentage by weight: 20-25% of limestone, 55-60% of sludge, 15-20% of sodium carbonate and 3-5% of oxalic acid;
s2, drying the water content of the lithium slag and the blast furnace slag to be less than or equal to 1 percent;
s3, primary grinding of blast furnace slag is carried out: the specific surface area of the powder to be ground is controlled to be 300-350m by adopting a grinding process 2 The specific surface area control method comprises the following steps of:using a cement fineness negative pressure screen analyzer, controlling the negative pressure to 5500-6000Pa, wherein the aperture of the cement fineness negative pressure screen analyzer is 0.08mm, and the screen residue is less than or equal to 2%;
s4, adding a grinding aid to carry out two-stage superfine grinding on the mixed powder of the lithium slag obtained in the step S2 and the blast furnace slag obtained in the step S3: grinding to specific surface area of 500-600 m 2 The surface area control method comprises the following steps of: and (3) controlling the negative pressure to 5500-6000Pa by using a cement fineness negative pressure screen analyzer, wherein the aperture of the cement fineness negative pressure screen analyzer is 0.03mm, and the screen residue is less than or equal to 2%.
And S5, uniformly stirring the superfine powder obtained in the step S4 and lignin by a stirrer.
Example 2
The mineral admixture for the high-performance green concrete comprises the following components in percentage by mass: 60 parts of lithium slag, 40 parts of blast furnace slag, grinding aid accounting for 0.4 per mill of the total mass of the lithium slag and the blast furnace slag and 2 per mill of lignin; the preparation method is the same as in example 1.
Example 3
The mineral admixture for the high-performance green concrete comprises the following components in percentage by mass: 50 parts of lithium slag, 50 parts of blast furnace slag, grinding aid accounting for 0.4 per mill of the total mass of the lithium slag and the blast furnace slag and 2 per mill of lignin; the preparation method is the same as in example 1.
Example 4
The mineral admixture for the high-performance green concrete comprises the following components in percentage by mass: 40 parts of lithium slag, 40 parts of blast furnace slag, 20 parts of steel slag and 0.6 per mill of grinding aid accounting for the total mass of the three waste residues; the preparation method is the same as in example 1, except that the water content of the steel slag in the step S2 is controlled to be less than 1%, primary grinding and magnetic separation are carried out in the step S3, and the steel slag is added as a mixed powder component in the step S4;
the method for magnetic separation and iron removal of the steel slag comprises the following steps: a magnetic disk with the width consistent with the width of the belt of the conveying material is arranged 0.5 m above the belt of the conveying material of the steel slag after grinding, and the ferric oxide content of the steel slag is controlled to be less than or equal to 10% by three sections of magnetic separation at the front end, the middle end and the tail end of the conveying belt;
example 5
The mineral admixture for the high-performance green concrete comprises the following components in percentage by mass: 50 parts of lithium slag, 40 parts of blast furnace slag, 10 parts of steel slag, 0.5 per mill of grinding aid and 1 per mill of lignin accounting for the total mass of the three waste residues; the preparation method is the same as in the embodiment 4.
Example 6
The mineral admixture for the high-performance green concrete comprises the following components in percentage by mass: 50 parts of lithium slag, 20 parts of blast furnace slag, 30 parts of fly ash (grade II) and grinding aid accounting for 0.4 per mill of the total mass of the three waste residues; the preparation method is the same as in example 1, wherein fly ash is added in step S5.
Example 7
The mineral admixture for the high-performance green concrete comprises the following components in percentage by mass: 60 parts of lithium slag, 20 parts of blast furnace slag, 20 parts of fly ash (grade II) and grinding aid accounting for 0.4 per mill of the total mass of the three waste residues; the preparation method is the same as in example 6.
The properties of the products obtained in examples 1 to 7 are shown in Table 2 below.
TABLE 2 Performance parameters of the mineral Admixture for high Performance Green concrete obtained in examples 1-6
The foregoing description of embodiments of the invention has been presented for purposes of illustration and description, and is not intended to be exhaustive or limited to the embodiments disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the various embodiments described. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.
Claims (10)
1. The mineral admixture for the high-performance green concrete is characterized by comprising a waste residue component and a grinding aid, wherein the waste residue component comprises 40-90% of lithium slag and 10-50% of blast furnace slag in percentage by mass; the grinding aid accounts for 0.4 to 0.6 per mill of the total amount of the waste residue components.
2. The mineral admixture for high performance green concrete of claim 1, wherein the waste residue component further comprises steel slag or class ii fly ash: when the slag is included, the slag is not more than 20% of the total amount of slag components in percentage by mass; when fly ash is included: the mass percentage of the fly ash is not more than 30% of the total amount of waste residue components;
the mineral admixture for the high-performance green concrete also contains lignin; the lignin accounts for 1 to 3 per mill of the total amount of the waste residue components.
3. The mineral admixture for high-performance green concrete according to claim 2, wherein the lithium slag comprises the following components in mass percent: siO (SiO) 2 ：57；Al 2 O 3 ：22.2；Fe 2 O 3 ：1.4；CaO：4.2；MgO：0.9；SO 3 ：6.2；Cl - ：0.01。
4. The mineral admixture for high-performance green concrete according to claim 2, wherein the fly ash (class ii) comprises the following components in mass percent: siO (SiO) 2 ：55.36；Al 2 O 3 ：28.2；Fe 2 O 3 ：5.59；CaO：1.71；MgO：1.81；SO 3 ：1.3；Na 2 O：0.4；Cl - :0.01, wherein the loss on ignition of the fly ash is 3.2%.
5. The mineral admixture for high-performance green concrete according to claim 2, wherein the steel slag comprises the following components in percentage by mass: siO (SiO) 2 ：16.13；Al 2 O 3 ：9.65；Fe 2 O 3 ：23.00；CaO：36.99；MgO：10.43；SO 3 ：0.26；K 2 O：1.12；Na 2 O：0.31。
6. Such asThe mineral admixture for high-performance green concrete of claim 1, wherein the blast furnace slag comprises the following components in mass percent: siO (SiO) 2 ：33.4；Al 2 O 3 ：15.2；Fe 2 O 3 ：1；CaO：39.4；MgO：6.2；SO 3 ：0.12；K 2 O：0.42；Na 2 O：0.11。
7. The mineral admixture for high performance green concrete of claim 1 wherein the grinding aid is triethanolamine.
8. A method for preparing a mineral admixture for high performance green concrete according to any one of claims 1 to 7, which is selected from the following method one or method two:
the method I comprises the following steps:
s1, sulfur reduction treatment of lithium slag: adding a desulfurization additive accounting for 2-6% of the weight of the lithium slag into the lithium slag, heating the lithium slag to 300-600 ℃ in a rotary kiln, performing heat treatment for 0.5-1h, dehydrating and desulfurizing the lithium slag, and improving the pH value to 8-10, wherein SO in the lithium slag is obtained after the sulfur reduction treatment 3 The content of (2) is less than or equal to 3.5%; the desulfurization additive consists of the following components in percentage by weight: 20-25% of limestone, 55-60% of sludge, 15-20% of sodium carbonate and 3-5% of oxalic acid;
s2, drying the water content of the lithium slag and the blast furnace slag to be less than or equal to 1 percent;
s3, primary grinding of blast furnace slag is carried out;
s4, adding a grinding aid to carry out two-stage superfine grinding on the mixed powder of the lithium slag obtained in the step S2 and the blast furnace slag obtained in the step S3;
s5, uniformly stirring the superfine powder obtained in the step S4 and lignin through a stirrer;
the second method comprises the following steps:
s1, sulfur reduction treatment of lithium slag: adding a desulfurization additive accounting for 2-6% of the weight of the lithium slag into the lithium slag, heating to 300-600 ℃ in a rotary kiln, performing heat treatment for 0.5-1h, dehydrating and desulfurizing, and improving the pH value to 8-10, wherein the desulfurization additive is added into the lithium slagAfter sulfur reduction treatment, SO in lithium slag 3 The content of (2) is less than or equal to 3.5%; the desulfurization additive consists of the following components in percentage by weight: 20-25% of limestone, 55-60% of sludge, 15-20% of sodium carbonate and 3-5% of oxalic acid;
s2, drying the water content of the lithium slag and the blast furnace slag to be less than or equal to 1 percent;
s3, adding a grinding aid to enable the mixture of the powder obtained in the step S2 to enter a vertical mill for grinding until the surface area is within a preset range;
and S4, uniformly stirring the superfine powder obtained in the step S3 and lignin by a stirrer.
9. The method for preparing the mineral admixture for high-performance green concrete according to claim 8, wherein in the first method:
when the slag component comprises steel slag, the water content of the steel slag is controlled to be less than 1% in the step S2, primary grinding and magnetic separation are carried out in the step S3, and the steel slag is added as a mixed powder component in the step S4;
the technological parameters of a primary grinding in the step S3 are as follows: the specific surface area of the powder to be ground is controlled to be 300-350m by adopting a grinding process 2 The specific surface area control method comprises the following steps of: using a cement fineness negative pressure screen analyzer, controlling the negative pressure to 5500-6000Pa, wherein the aperture of the cement fineness negative pressure screen analyzer is 0.08mm, and the screen residue is less than or equal to 2%;
the method for magnetic separation and iron removal of the steel slag comprises the following steps: a magnetic disk with the width consistent with the width of the belt of the conveying material is arranged 0.5 m above the belt of the conveying material of the steel slag after grinding, and the ferric oxide content of the steel slag is controlled to be less than or equal to 10% by three sections of magnetic separation at the front end, the middle end and the tail end of the conveying belt;
when the class ii fly ash is included in the waste residue component, the fly ash is added as a mixed powder component in step S4.
10. The method for preparing the mineral admixture for high-performance green concrete according to claim 8, wherein in the second method:
when the slag component comprises steel slag, the water content of the steel slag is dried to be less than or equal to 1% in the step S2, and the steel slag is added as a mixed powder component in the step S3;
the process operation and parameters of step S2 are: the specific surface area of the material to be milled is controlled to be 300-350m 2 The surface area control method is that the negative pressure is controlled to 5500-6000Pa by a cement fineness negative pressure screen analyzer, the aperture of the cement fineness negative pressure screen analyzer is 0.08mm, and the screen residue is less than or equal to 2%;
the method for magnetic separation and iron removal of the steel slag comprises the following steps: a magnetic disk with the width consistent with the width of the belt of the conveying material is arranged 0.5 m above the belt of the conveying material of the steel slag after grinding, and the ferric oxide content of the steel slag is controlled to be less than or equal to 10% by three sections of magnetic separation at the front end, the middle end and the tail end of the conveying belt;
when the waste residue component comprises the class II fly ash, the fly ash is added as a mixed powder component in the step S3;
the powder grinding adopts a vertical mill or a superfine ball mill.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106116189A (en) * | 2016-06-28 | 2016-11-16 | 东南大学 | A kind of no first-hand datum lithium slag composite gelled material |
| CN114643271A (en) * | 2022-03-25 | 2022-06-21 | 珠海广隆新材料科技有限公司 | Solid waste lithium slag and treatment method and application thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106116189A (en) * | 2016-06-28 | 2016-11-16 | 东南大学 | A kind of no first-hand datum lithium slag composite gelled material |
| CN114643271A (en) * | 2022-03-25 | 2022-06-21 | 珠海广隆新材料科技有限公司 | Solid waste lithium slag and treatment method and application thereof |
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