Cementing material and preparation method and application thereof
阅读说明：本技术 一种胶凝材料及其制备方法及其应用 (Cementing material and preparation method and application thereof ) 是由 刘瑛 康凌晨 张华� 于 2020-06-17 设计创作，主要内容包括：本发明公开了一种胶凝材料及其制备方法、应用,其中胶凝材料的制备方法,将钢渣破碎成钢渣砂,再将氟石膏与活性激发剂混合成混合料,然后将钢渣砂、矿粉以及混合料充分混匀制得胶凝材料；该胶凝材料能够在混凝土或砂浆中的应用。本发明利用钢渣砂、氟石膏制备胶凝材料,既解决了钢渣和氟石膏的堆存问题,减少了环境污染,又通过提高钢渣和氟石膏的附加值,实现了资源化利用。(The invention discloses a cementing material and a preparation method and application thereof, wherein the preparation method of the cementing material comprises the steps of crushing steel slag into steel slag sand, mixing fluorgypsum and an active excitant into a mixture, and fully and uniformly mixing the steel slag sand, mineral powder and the mixture to prepare the cementing material; the cementing material can be applied to concrete or mortar. The invention utilizes the steel slag sand and the fluorgypsum to prepare the cementing material, thereby not only solving the problem of stacking the steel slag and the fluorgypsum and reducing the environmental pollution, but also realizing the resource utilization by improving the additional values of the steel slag and the fluorgypsum.)
1. A preparation method of a cementing material is characterized in that steel slag is crushed into steel slag sand, fluorgypsum and an active excitant are mixed into a mixture, and then the steel slag sand, mineral powder and the mixture are fully and uniformly mixed to prepare the cementing material.
2. The method for preparing the cementitious material of claim 1, comprising the steps of:
s1, preparing steel slag sand, and crushing, magnetically separating and screening steel slag to obtain the steel slag sand with the particle size of less than or equal to 10 mm;
s2, preparing a mixture, mixing the fluorgypsum with an active excitant and performing ball milling to obtain the mixture, wherein the active excitant accounts for 8% -11% of the total weight of the fluorgypsum;
s3, mixing the steel slag sand, the mineral powder and the mixture according to the mass percentage of (60-70): (15-30): (10-17) mixing, and fully and uniformly mixing to obtain the cementing material.
3. The method for preparing the cement of claim 2, wherein the step S1 includes the steps of:
s11, crushing the steel slag with the particle size of 0-150 mm after primary crushing and iron selection into steel slag with the particle size of less than or equal to 50mm by using a jaw crusher, and separating out first steel slag after magnetic separation;
s12, crushing the first steel slag through a rod mill, magnetically separating and screening through a vibrating screen with the particle size of 10mm, returning the first steel slag with the particle size of more than 10mm to the rod mill for crushing again, and magnetically separating the first steel slag with the particle size of less than or equal to 10mm to obtain the steel slag sand.
4. The method for preparing the cementing material of claim 2, wherein in the step S1, the steel slag sand is not processed by drying, grinding and aging processes.
5. The method for preparing the cementitious material according to claim 2, wherein in the step S2, the activity activator is 8.1-10% of the total mass of the fluorgypsum.
6. The method for preparing the cement of claim 2, wherein in step S2, the activity activator comprises the following components in percentage by weight: 20 to 50 percent of alum and 50 to 80 percent of cement with the strength grade of more than or equal to 42.5.
7. The method for preparing the cementitious material of claim 6 wherein the specific surface area of the mixture is not less than 350 square meters per kilogram.
8. The preparation method of the cementing material of claim 2, wherein in the step S3, the steel slag sand, the mineral powder and the mixture are (60-70) by mass: (15-30): (10-16.5).
9. A cementitious material, characterised in that it is produced by a method of producing a cementitious material according to any one of claims 1 to 8.
10. Use of a cementitious material according to claim 9 in concrete or mortar.
Technical Field
The invention relates to the field of cementing materials, in particular to a cementing material, a preparation method and application thereof, and the cementing material is mainly prepared from steel slag sand and fluorgypsum.
Background
The main chemical components of the steel slag comprise CaO and SiO2、Al2O3、Fe2O3、MgO、P2O5The slag waste discharged in the steel-making process has large fluctuation in chemical components of the steel slag due to different minerals used in steel-making and steel-making processes, and the slag is a strong potential gelling active substance although the gelling property is not strong based on the composition difference of the steel slag; at present, the steel slag emission is large, the utilization efficiency is low, the output of the steel slag is 10% -15% of the output of crude steel, an effective way for large-scale resource utilization of steel slag resources is not found in the prior art, about 70% of the steel slag is in a stacking and landfill state, and the steel slag not only contributes to production and development of enterprisesCausing huge pressure, occupying limited cultivated land resources and seriously damaging the ecological environment. The fluorgypsum has activity excitation capability, can excite the potential gelling activity of steel slag, belongs to industrial solid waste which is difficult to utilize, is a byproduct in the production process of hydrofluoric acid, can generate 4-5 tons of fluorgypsum when 1 ton of hydrofluoric acid is produced, and is directly stacked by a treatment method, so that the land is occupied, and soil and underground water environment are polluted.
In view of the above circumstances, there is a need to develop a method for reasonably utilizing steel slag and fluorgypsum, which solves the problem of stacking steel slag and fluorgypsum and reduces environmental pollution; on the other hand, the added values of the steel slag and the fluorgypsum are improved, and the resource utilization is realized.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a cementing material, a preparation method and application thereof.
In order to achieve the purpose, the invention adopts the following technical scheme:
the first aspect of the invention provides a preparation method of a cementing material, which comprises the steps of crushing steel slag into steel slag sand, mixing fluorgypsum and an active excitant into a mixture, and fully and uniformly mixing the steel slag sand, mineral powder and the mixture to obtain the cementing material.
Preferably, the preparation method of the cementing material comprises the following steps:
s1, preparing steel slag sand, and crushing, magnetically separating and screening steel slag to obtain the steel slag sand with the particle size of less than or equal to 10 mm;
s2, preparing a mixture, mixing the fluorgypsum with an active excitant and performing ball milling to obtain the mixture, wherein the active excitant accounts for 8% -11% of the total weight of the fluorgypsum;
s3, mixing the steel slag sand, the mineral powder and the mixture according to the mass percentage of (60-70): (15-30): (10-17) mixing, and fully and uniformly mixing to obtain the cementing material.
Preferably, the step S1 specifically includes the following steps:
s11, crushing the steel slag with the particle size of 0-150 mm after primary crushing and iron selection into steel slag with the particle size of less than or equal to 50mm by using a jaw crusher, and separating out first steel slag after magnetic separation;
s12, crushing the first steel slag through a rod mill, carrying out magnetic separation and screening through a vibrating screen with the particle size of 10mm, returning the first steel slag with the particle size of more than 10mm to the rod mill for crushing again, and carrying out magnetic separation on the first steel slag with the particle size of less than or equal to 10mm to obtain the steel slag sand.
Preferably, in the step S1, the steel slag sand is not processed by drying, grinding and aging processes.
Preferably, in step S2, the activity activator is 8.1% to 10% of the total mass of the fluorgypsum.
Preferably, in step S2, the activity activator includes the following components by weight percentage: 20 to 50 percent of alum and 50 to 80 percent of cement with the strength grade of more than or equal to 42.5.
Preferably, the specific surface area of the mixture is more than or equal to 350 square meters per kg.
Preferably, in the step S3, the steel slag sand, the mineral powder and the mixture are (60-70) by mass: (15-30): (10-16.5).
In a second aspect, the present invention provides a cementitious material, prepared by the method of preparing a cementitious material according to the first aspect.
A third aspect of the invention provides a use of a cementitious material as defined in the second aspect in concrete or mortar.
The invention has the beneficial effects that:
1. according to the preparation method of the cementing material, the steel slag, the fluorgypsum and the like are used as raw materials to prepare the cementing material, so that the problem of stacking of the steel slag and the fluorgypsum is solved, the environmental pollution is reduced, and the resource utilization is realized by improving the additional values of the steel slag and the fluorgypsum;
2. in the preparation method of the cementing material, the steel slag is used as an alkaline material to adjust the pH value of the fluorgypsum, and under the combined action of the steel slag and the active excitant, the hydration speed of the anhydrous fluorgypsum is greatly accelerated, the conversion rate of the dihydrate gypsum is rapidly increased, and the hardening time is shortened; after the fluorgypsum is converted into the dihydrate gypsum, the steel slag and the mineral powder can be further promoted to be hydrated together to generate hydration products such as ettringite and the like;
3. the cementing material prepared by the preparation method of the cementing material has high reaction activity and low needle and flake contents, and compared with the conventional cementing material, the cementing material has high wear resistance and low reaction hydration heat; the flexural strength can be improved by 1-3 MPa under the condition of preparing the concrete with the same level of compressive strength;
4. the cementing material prepared by the preparation method of the cementing material can replace the conventional cement to prepare concrete or mortar, and because the prices of materials such as steel slag, mineral powder and the like are far lower than that of the conventional cement, the economic benefit is good, the industrial solid waste is also eliminated, and the environmental pollution is reduced.
Detailed Description
The present invention will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the invention, but are not intended to limit the invention in any way.
The preparation method of the cementing material provided by the invention comprises the steps of crushing steel slag into steel slag sand, mixing fluorgypsum and an active excitant into a mixture, and fully and uniformly mixing the steel slag sand, mineral powder and the mixture to prepare the cementing material; the preparation method of the gel material provided by the invention specifically comprises the following steps:
s1, preparing steel slag sand, and crushing, magnetically separating and screening steel slag to obtain the steel slag sand with the particle size of less than or equal to 10 mm;
the steel slag sand preparation method comprises the following specific steps:
s11, crushing the steel slag with the particle size of 0-150 mm after primary crushing and iron selection into steel slag with the particle size of less than or equal to 50mm by using a jaw crusher, and separating out first steel slag after magnetic separation;
s12, crushing the first steel slag through a rod mill, carrying out magnetic separation and screening through a vibrating screen with the particle size of 10mm, returning the first steel slag with the particle size of more than 10mm to the rod mill for crushing again, and carrying out magnetic separation on the first steel slag with the particle size of less than or equal to 10mm to obtain the steel slag sand.
Wherein, the steel slag sand is not treated by drying, grinding and aging processes.
S2, preparing a mixture, mixing the fluorgypsum with an activity excitant and ball-milling to obtain the mixture with the specific surface area of more than or equal to 350 square meters per kg, wherein the activity excitant accounts for 8-11% of the total weight of the fluorgypsum, and the activity excitant accounts for 8.1-10% of the total weight of the fluorgypsum preferably; the activity excitant comprises the following components in percentage by weight: 20 to 50 percent of alum and 50 to 80 percent of cement with the strength grade of more than or equal to 42.5;
s3, mixing the steel slag sand, the mineral powder and the mixture according to the mass percentage of (60-70): (15-30): (10-17), wherein the steel slag sand, the mineral powder and the mixture are preferably adopted according to the mass percentage of (60-70): (15-30): (10-16.5), then sending the mixture into a mixer, stirring the mixture fully and uniformly, metering, bagging, performing total inspection, and warehousing to finally obtain the cementing material.
The cementing material prepared by the steps can meet the strength requirement of 42.5-grade cement, and can be applied to concrete or mortar instead of cement.
The gel material, the preparation method and the application thereof are further described with reference to specific examples;
example 1
The steel slag raw material used in the embodiment is converter slag, the converter slag is treated by a hot splashing method, and the cooled raw slag is subjected to magnetic separation to separate large blocks of slag steel to obtain 0-150 mm steel slag; the fluorgypsum is a byproduct generated in the production process of hydrofluoric acid; the active excitant is alum and cement with 42.5-grade strength in the market; the mineral powder is granulated blast furnace slag powder meeting the S95 grade in GB/T18046-2017.
S1, preparing steel slag sand, and crushing, magnetically separating and screening steel slag to obtain the steel slag sand with the particle size of less than or equal to 10 mm;
s2, preparing a mixture, mixing 10 parts of fluorgypsum with 0.8 part of an activity exciting agent (wherein the activity exciting agent comprises 0.2 part of alum and 0.6 part of cement with the strength grade of more than or equal to 42.5), and performing ball milling to obtain the mixture with the specific surface area of more than or equal to 350 square meters per kg;
and S3, mixing 60 parts of steel slag sand, 29 parts of mineral powder and 11 parts of mixture according to mass percentage, feeding the mixture into a mixer, stirring the mixture fully and uniformly, metering, bagging, performing total inspection and warehousing, and finally obtaining the cementing material.
The flexural strength of the gelled material prepared in the steps is 5.6Mpa after 3 days, and the compressive strength is 19.8 Mpa; the 28-day flexural strength is 7.8Mpa, the compressive strength is 44.2Mpa, the strength requirement of cement with the strength grade of 42.5 is achieved, and the cement can be applied to concrete or mortar instead of cement.
Example 2
The steel slag raw material used in the embodiment is converter slag, the converter slag is treated by a hot splashing method, and the cooled raw slag is subjected to magnetic separation to separate large blocks of slag steel to obtain 0-150 mm steel slag; the fluorgypsum is a byproduct generated in the production process of hydrofluoric acid; the active excitant is alum and cement with 42.5-grade strength in the market; the mineral powder is granulated blast furnace slag powder meeting the S95 grade in GB/T18046-2017.
S1, preparing steel slag sand, and crushing, magnetically separating and screening steel slag to obtain the steel slag sand with the particle size of less than or equal to 10 mm;
s2, preparing a mixture, mixing 15 parts of fluorgypsum with 1.5 parts of an activity exciting agent (wherein the activity exciting agent comprises 0.3 part of alum and 1.2 parts of cement), and performing ball milling to obtain the mixture with the specific surface area of more than or equal to 350 square meters per kg;
and S3, mixing 60 parts of steel slag sand, 23.5 parts of mineral powder and 16.5 parts of the mixture according to mass percentage, feeding the mixture into a mixer, stirring the mixture fully and uniformly, metering, bagging, performing total inspection and warehousing, and finally obtaining the cementing material.
The flexural strength of the gelled material prepared in the steps is 6.1Mpa after 3 days, and the compressive strength is 20.2 Mpa; the 28-day flexural strength is 8.6Mpa, the compressive strength is 46.8Mpa, the strength requirement of cement with the strength grade of 42.5 is achieved, and the cement can be applied to concrete or mortar instead of cement.
Example 3
The steel slag raw material used in the embodiment is converter slag, the converter slag is treated by a hot splashing method, and the cooled raw slag is subjected to magnetic separation to separate large blocks of slag steel to obtain 0-150 mm steel slag; the fluorgypsum is a byproduct generated in the production process of hydrofluoric acid; the active excitant is alum and cement with a commercial strength grade of 52.5; the mineral powder is granulated blast furnace slag powder meeting the S95 grade in GB/T18046-2017.
S1, preparing steel slag sand, and crushing, magnetically separating and screening steel slag to obtain the steel slag sand with the particle size of less than or equal to 10 mm;
s2, preparing a mixture, namely mixing 10 parts of fluorgypsum with 0.82 part of an activity exciting agent (wherein the activity exciting agent comprises 0.41 part of alum and 0.41 part of cement), and performing ball milling to obtain the mixture with the specific surface area of more than or equal to 350 square meters per kg;
s3, mixing 65 parts of steel slag sand, 24 parts of mineral powder and 11 parts of mixture according to mass percentage, feeding the mixture into a mixer, stirring the mixture fully and uniformly, metering, bagging, performing total inspection and warehousing, and finally obtaining the cementing material.
The flexural strength of the gelled material prepared in the steps is 6.9Mpa after 3 days, and the compressive strength is 27.8 Mpa; the 28-day flexural strength is 9.7Mpa, the compressive strength is 50.2Mpa, the strength requirement of cement with the strength grade of 42.5 is achieved, and the cement can be applied to concrete or mortar instead of cement.
Example 4
The steel slag raw material used in the embodiment is converter slag, the converter slag is treated by a hot splashing method, and the cooled raw slag is subjected to magnetic separation to separate large blocks of slag steel to obtain 0-150 mm steel slag; the fluorgypsum is a byproduct generated in the production process of hydrofluoric acid; the active excitant is alum and cement with a commercial strength grade of 52.5; the mineral powder is granulated blast furnace slag powder meeting the S95 grade in GB/T18046-2017.
S1, preparing steel slag sand, and crushing, magnetically separating and screening steel slag to obtain the steel slag sand with the particle size of less than or equal to 10 mm;
s2, preparing a mixture, mixing 15 parts of fluorgypsum and 1.5 parts of an activity exciting agent (wherein the activity exciting agent comprises 0.5 part of alum and 1 part of cement), and performing ball milling to obtain the mixture with the specific surface area of more than or equal to 350 square meters per kg;
s3, mixing 65 parts of steel slag sand, 18.5 parts of mineral powder and 16.5 parts of the mixture according to mass percentage, sending the mixture into a mixer, stirring the mixture fully and uniformly, metering, bagging, general inspection and warehousing, and finally obtaining the cementing material.
The flexural strength of the gelled material prepared in the steps is 6.2Mpa after 3 days, and the compressive strength is 22.3 Mpa; the 28-day flexural strength is 8.3Mpa, the compressive strength is 47.4Mpa, the strength requirement of cement with the strength grade of 42.5 is met, and the cement can be applied to concrete or mortar instead of cement.
Example 5
The steel slag raw material used in the embodiment is converter slag, the converter slag is treated by a hot splashing method, and the cooled raw slag is subjected to magnetic separation to separate large blocks of slag steel to obtain 0-150 mm steel slag; the fluorgypsum is a byproduct generated in the production process of hydrofluoric acid; the active excitant is alum and cement with 42.5-grade strength in the market; the mineral powder is granulated blast furnace slag powder meeting the S95 grade in GB/T18046-2017.
S1, preparing steel slag sand, and crushing, magnetically separating and screening steel slag to obtain the steel slag sand with the particle size of less than or equal to 10 mm;
s2, preparing a mixture, mixing 9 parts of fluorgypsum with 0.99 part of an activity exciting agent (wherein the activity exciting agent comprises 0.49 part of alum and 0.5 part of cement), and performing ball milling to obtain the mixture with the specific surface area of more than or equal to 350 square meters per kg;
and S3, mixing 70 parts of steel slag sand, 20 parts of mineral powder and 10 parts of mixture according to mass percentage, feeding the mixture into a mixer, stirring the mixture fully and uniformly, metering, bagging, performing total inspection and warehousing, and finally obtaining the cementing material.
The flexural strength of the gelled material prepared in the steps is 4.5Mpa and the compressive strength is 18.1Mpa after 3 days; the 28-day flexural strength is 7.6Mpa, the compressive strength is 43.5Mpa, the strength requirement of 42.5-grade cement is met, and the cement can be applied to concrete or mortar instead of cement.
Example 6
The steel slag raw material used in the embodiment is converter slag, the converter slag is treated by a hot splashing method, and the cooled raw slag is subjected to magnetic separation to separate large blocks of slag steel to obtain 0-150 mm steel slag; the fluorgypsum is a byproduct generated in the production process of hydrofluoric acid; the active excitant is alum and cement with 42.5-grade strength in the market; the mineral powder is granulated blast furnace slag powder meeting the S95 grade in GB/T18046-2017.
S1, preparing steel slag sand, and crushing, magnetically separating and screening steel slag to obtain the steel slag sand with the particle size of less than or equal to 10 mm;
s2, preparing a mixture, mixing 14 parts of fluorgypsum with 1.4 parts of an activity exciting agent (wherein the activity exciting agent comprises 0.6 part of alum and 0.8 part of cement), and performing ball milling to obtain the mixture with the specific surface area of more than or equal to 350 square meters per kg;
and S3, mixing 70 parts of steel slag sand, 15 parts of mineral powder and 15 parts of mixture according to mass percentage, feeding the mixture into a mixer, stirring the mixture fully and uniformly, metering, bagging, performing total inspection and warehousing, and finally obtaining the cementing material.
The flexural strength of the gelled material prepared in the steps is 6.0Mpa in 3 days, and the compressive strength is 20.1 Mpa; the 28-day flexural strength is 8.8Mpa, the compressive strength is 47.6Mpa, the strength requirement of cement with the strength grade of 42.5 is met, and the cement can be applied to concrete or mortar instead of cement.
With the comprehensive embodiments of 1-6, the preparation method of the cementing material provided by the invention uses the steel slag, the fluorgypsum and the like as raw materials to prepare the cementing material, so that the problem of stacking the steel slag and the fluorgypsum is solved, the environmental pollution is reduced, and the resource utilization is realized by improving the additional values of the steel slag and the fluorgypsum; in the preparation method of the cementing material, the steel slag is used as an alkaline material to adjust the pH value of the fluorgypsum, and under the combined action of the steel slag and the active excitant, the hydration speed of the anhydrous fluorgypsum is greatly accelerated, the conversion rate of the dihydrate gypsum is rapidly increased, and the hardening time is shortened; after the fluorgypsum is converted into the dihydrate gypsum, the steel slag and the mineral powder can be further promoted to be hydrated together to generate hydration products such as ettringite and the like; the gelled material has high reaction activity and low needle and flake contents, and compared with the conventional gelled material, the gelled material has high wear resistance and low hydration heat; the flexural strength can be improved by 1-3 MPa under the condition of preparing the concrete with the same level of compressive strength; the cementing material can replace the conventional cement to prepare concrete or mortar, and because the prices of materials such as steel slag, mineral powder and the like are far lower than that of the conventional cement, the cementing material not only has good economic benefit, but also consumes industrial solid wastes, and reduces the environmental pollution.
Although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted without departing from the spirit and scope of the invention as defined in the appended claims.