CN108585570B - Method for preparing autoclaved brick by utilizing modified steel slag - Google Patents
Method for preparing autoclaved brick by utilizing modified steel slag Download PDFInfo
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- CN108585570B CN108585570B CN201810359427.9A CN201810359427A CN108585570B CN 108585570 B CN108585570 B CN 108585570B CN 201810359427 A CN201810359427 A CN 201810359427A CN 108585570 B CN108585570 B CN 108585570B
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
- C04B20/02—Treatment
- C04B20/04—Heat treatment
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
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Abstract
A method for preparing autoclaved bricks by utilizing modified steel slag comprises the steps of carrying out modification treatment on steel slag tailings obtained after iron selection treatment by crushing again in a steelworks, screening, loading, adding water and autoclaving, taking 15-40% of modified steel slag, 30-40% of fly ash or river sand, 15-30% of furnace slag and 8-15% of cement, lime or carbide mud according to the weight percentage, adding 7-12% of water, stirring, digesting or aging and carrying out secondary stirring according to the manufacturing process of the autoclaved bricks, carrying out static pressure and exhaust to prepare green bricks under the molding pressure of 7-13Mpa, and finally carrying out autoclaved curing to obtain finished autoclaved bricks.
Description
Technical Field
The invention relates to the field of comprehensive utilization of resources and the field of building materials, in particular to a method for preparing a steam-pressed brick in a large scale after modifying steel slag.
Background
The steel slag is slag discharged in the steel smelting process, is used as main metallurgical slag in the steel industry, has huge discharge amount every year, the quantity of the slag is generally 15% -20% of the steel yield, and the accumulation of a large amount of steel slag easily causes environmental pollution, so that the problem of how to recycle the steel slag and improve the added value becomes the problem to be solved for the comprehensive utilization of resources. The steel slag produced by the existing steel-making furnace is generally crushed and sorted again by a steel mill, and is remelted after being treated by iron selection, and the steel slag with higher iron content is stacked as waste. It is this portion of the steel slag that is piled up that we want to handle.
The production and application of the steel slag as aggregate for brickmaking have made some progress. The invention discloses a method for preparing a autoclaved brick by using iron tailings and steel slag (application publication No. CN 103539417). aiming at the problem of poor stability of the steel slag, the steel slag subjected to grinding, chemical digestion and medium-temperature autoclaving are adopted, the modified steel slag powder is used as a main gel material, meanwhile, the steel slag is obtained by grinding firstly, the grinding task is heavy, and the steel slag is autoclaved for 15-20 hours at 70-90 ℃, so that the efficiency is low. The invention relates to a steel slag powder-doped autoclaved brick and a preparation method thereof (application publication No. CN 104909634A), which is also a method for grinding steel slag and then pressing the autoclaved brick, and also relates to a steel slag stability processing method (application publication No. CN 103524058A), wherein the steel slag stability processing method also needs to grind the steel slag and then process the ground steel slag at the temperature of 20-50 ℃ so as to solve the problem of steel slag stability; the invention discloses an autoclaved aerated concrete block prepared from iron tailings and steel slag and a preparation method thereof (application publication No. CN 103693919A), which solves the problem of stability of the steel slag by adopting 'mixed wet grinding, chemical excitation and waste heat treatment', and the steel slag is required to be ground and then treated again.
From the above, the existing steel slag treatment method mainly treats the steel slag powder, thereby solving the stability hidden trouble of the steel slag and then carrying out secondary utilization. The grinding treatment of the steel slag consumes a large amount of energy and causes secondary pollution to the environment, and the low grinding capacity causes the problems that the cost of the treated steel slag powder is too high and the steel slag powder cannot be applied industrially. Meanwhile, if the steel slag is not treated and stacked for a long time, the steel slag occupies land and generates dust at the same time, thereby causing environmental pollution.
Disclosure of Invention
The invention aims to solve the problems that long-term stacking of steel slag occupies a site and causes pollution, the grinding treatment capacity is low, and the treatment cost is high, and provides a method for preparing a autoclaved brick by utilizing modified steel slag.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
a method for preparing autoclaved bricks by utilizing modified steel slag comprises the steps of feeding the modified steel slag obtained by a steel slag modification process and other materials into an autoclaved brick production line according to a ratio to prepare an autoclaved brick; the steel slag modification process comprises the following steps:
the first step, the steel slag tailings after the iron separation treatment by the steel mill are sieved, the sieve residue after sieving by a 5mm sieve is less than 10%, and the maximum particle size is not more than 8 mm; too large steel slag particles can lead to incomplete reaction in the steel slag during the steam pressing process, thereby leading to explosion points of the pressed finished steam pressed brick.
Secondly, loading the screened steel slag into a vehicle for steaming and pressing, wherein the thickness of a material layer of the steel slag on the vehicle is not more than 1m, and if the thickness of the material layer of the steel slag on the vehicle is more than 1m, a vent channel needs to be arranged in the material layer, so that the steel slag can fully react in the steaming and pressing process;
thirdly, adding water accounting for 25-35% of the weight of the steel slag into the steel slag after loading, and uniformly stirring; before the steel slag is autoclaved, if the water content of the steel slag is insufficient, the interior of the steel slag is insensitive to high-temperature and high-pressure steam reaction, and a large-particle steel slag interior has an incomplete reaction part, so that when the material is used for preparing an autoclaved brick, the finished autoclaved brick is easy to have an explosion point and the strength of a brick product is influenced;
fourthly, carrying out autoclaved treatment on the steel slag added with water in a constant-temperature and constant-pressure environment for 3-6 hours to obtain modified steel slag, wherein the constant-temperature and constant-pressure environment is a saturated steam environment with the temperature of 170-187.9 ℃ and the pressure of 0.8-1.2 MPa;
the proportion of the modified steel slag to other materials is as follows according to the weight percentage: 15-40% of modified steel slag, 30-40% of fly ash or river sand, 15-30% of furnace slag and 8-15% of cement, lime or carbide mud.
After the modified steel slag and other materials are proportioned, 7-12% of water is added according to weight percentage, then the mixture is sent to an autoclaved brick production line to be stirred, digested or aged and secondarily stirred, and is subjected to static pressure and exhaust at the forming pressure of 7-13Mpa to be made into a green brick, and finally, the green brick is autoclaved and cured to be a finished autoclaved brick.
The invention has the beneficial effects that:
the steel slag modification process provided by the invention does not need to grind the steel slag, realizes the modification treatment of the steel slag through the screening of the steel slag, the control of the thickness of a material layer after loading, the introduction of water in the steel slag before autoclaving and the control of the autoclaved environment, has short time consumption in the whole process, saves energy, does not cause secondary pollution to the environment, and can be put into industrial application on a large scale to prepare autoclaved bricks because the obtained modified steel slag has low cost.
Drawings
FIG. 1 shows the test results of the compression and bending tests performed on the fabricated autoclaved brick.
Detailed Description
The technical solution of the present invention is further described with reference to the following specific embodiments. For the comparative purposes of the following examples, all examples were pressed using a 36-cavity standard brick die with a green compact size of 240mmx115mmx53 mm.
A method for preparing an autoclaved brick by utilizing modified steel slag comprises a steel slag modification process and an autoclaved brick pressing process.
Example 1
1. Steel slag modification process
The first step, the steel slag tailings after the steel mill secondary crushing and iron selecting treatment are screened, and the screening requirements are as follows: the screen allowance after being screened by a 5mm mesh screen is less than 10 percent, and the maximum particles are not more than 8 mm;
secondly, loading the screened steel slag into a vehicle to prepare steam pressure, wherein the thickness of a material layer of the steel slag on the vehicle is not more than 1m, and if the thickness of the material layer of the steel slag on the vehicle is more than 1m, arranging a vent channel in the material layer;
thirdly, adding water accounting for 25 percent of the weight of the steel slag into the steel slag after loading, and uniformly stirring;
and fourthly, carrying out autoclaved treatment on the steel slag added with water in a constant-temperature and constant-pressure environment, taking out the steel slag after 6 hours of autoclaved treatment to obtain modified steel slag, wherein the constant-temperature and constant-pressure environment is a saturated steam environment with the temperature of 170 ℃ and the pressure of 0.8 MPa.
2. Steam pressing brick pressing process
Preparing materials according to the weight ratio of 15% of cement, 40% of fly ash, 15% of modified steel slag and 30% of furnace slag, adding 8% of water by weight, sending the mixture into an autoclaved brick production line, stirring, digesting, stirring for the second time, and then carrying out static pressure exhaust under the forming pressure of 7MPa to prepare an autoclaved brick blank.
Example 2
1. Steel slag modification process
The first and second steps are the same as in example 1;
thirdly, adding water accounting for 30 percent of the weight of the steel slag into the steel slag after loading, and uniformly stirring;
and fourthly, carrying out autoclaved treatment on the steel slag added with water in a constant-temperature and constant-pressure environment, taking out the steel slag after 5 hours of autoclaved treatment to obtain modified steel slag, wherein the constant-temperature and constant-pressure environment is a saturated steam environment with the temperature of 184.1 ℃ and the pressure of 1.1 MPa.
2. Steam pressing brick pressing process
Preparing materials according to the weight ratio of 13% of cement, 35% of fly ash, 30% of modified steel slag and 22% of furnace slag, adding water with the weight fraction of 12%, sending the mixture into an autoclaved brick production line, stirring, digesting, stirring for the second time, and then carrying out static pressure exhaust under the forming pressure of 9MPa to prepare an autoclaved brick blank.
Example 3
1. Steel slag modification process
The first and second steps are the same as in example 1;
thirdly, adding water accounting for 35 percent of the weight of the steel slag into the steel slag after loading, and uniformly stirring;
and fourthly, carrying out autoclaved treatment on the steel slag added with water in a constant-temperature and constant-pressure environment, taking out the steel slag after 3 hours of autoclaved treatment to obtain modified steel slag, wherein the constant-temperature and constant-pressure environment is a saturated steam environment with the temperature of 187.9 ℃ and the pressure of 1.2 MPa.
2. Steam pressing brick pressing process
Preparing materials according to the weight ratio of 8% of cement, 30% of fly ash, 35% of modified steel slag and 27% of furnace slag, adding 10% of water by weight, sending the mixture into an autoclaved brick production line, stirring, digesting, stirring for the second time, and then carrying out static pressure exhaust under the forming pressure of 10MPa to prepare an autoclaved brick blank.
Example 4
1. Steel slag modification process
The first and second steps are the same as in example 1;
thirdly, adding water accounting for 35 percent of the weight of the steel slag into the steel slag after loading, and uniformly stirring;
and fourthly, carrying out autoclaved treatment on the steel slag added with water in a constant-temperature and constant-pressure environment, taking out the steel slag after 4.5 hours of autoclaved treatment to obtain the modified steel slag, wherein the constant-temperature and constant-pressure environment is a saturated steam environment with the temperature of 184.1 ℃ and the pressure of 1.1 MPa.
2. Steam pressing brick pressing process
Preparing materials according to the weight ratio of 15% of cement, 30% of fly ash, 40% of modified steel slag and 15% of furnace slag, adding water with the weight fraction of 9%, sending the mixture into an autoclaved brick production line, stirring, digesting, stirring for the second time, and then carrying out static pressure exhaust under the forming pressure of 13MPa to prepare an autoclaved brick blank.
In the above embodiment, the used fly ash can be replaced by river sand with the same proportion, and the used cement can be replaced by lime or carbide mud with the same proportion.
Several comparative examples are set forth below and the autoclaved bricks made in the examples and comparative examples were tested.
Comparative example 1
The treatment is completely the same as that of the embodiment 1 except that the steel slag is not subjected to the modification process treatment;
comparative example 2
The treatment is completely the same as the example 2 except that the steel slag is not subjected to the modification process treatment;
comparative example 3
The treatment is completely the same as that of the embodiment 3 except that the steel slag is not subjected to the modification process treatment;
comparative example 4
The treatment is completely the same as that of the embodiment 4 except that the steel slag is not subjected to the modification process treatment;
comparative example 5
1. Steel slag modification process
The first and second steps are the same as in example 1;
and thirdly, sending the steel slag into a constant-temperature and constant-pressure environment for autoclaving without adding water, taking out the steel slag after 4.5 hours of autoclaving to obtain the modified steel slag, wherein the constant-temperature and constant-pressure environment is a saturated steam environment at 190 ℃ and 1.1 MPa.
2. Steam pressing brick pressing process
Preparing materials according to the weight ratio of 13% of cement, 32% of fly ash, 40% of modified steel slag and 15% of furnace slag, adding 9% of water by weight, sending the mixture into an autoclaved brick production line, stirring, digesting, stirring for the second time, and then carrying out static pressure exhaust under the forming pressure of 11MPa to prepare an autoclaved brick blank.
The green bricks of the autoclaved bricks pressed in all the examples and comparative examples are sent into the same autoclave, and then high-temperature high-pressure steam is introduced for carrying out the autoclaved curing of the autoclaved bricks (the specific temperature-rising curve is controlled according to the temperature-rising curve of the autoclaved bricks). The cured autoclaved brick is subjected to compression resistance and bending resistance tests, and the obtained test results are shown in figure 1.
As can be seen from the test results in FIG. 1, if a large amount of steel slag which is not treated by the steel slag modification process of the present invention is added to prepare autoclaved bricks, the autoclaved bricks will have cracks or even cracks, and the steel slag modified by the present invention is used for preparing autoclaved bricks, not only can be added in a large amount, but also the strength of the finished autoclaved bricks can reach the building material industry standard (JC/T239-.
Claims (3)
1. A method for preparing autoclaved bricks by utilizing modified steel slag comprises the steps of feeding the modified steel slag obtained by a steel slag modification process and other materials into an autoclaved brick production line according to a ratio to prepare an autoclaved brick; the method is characterized in that the steel slag modification process comprises the following steps:
the first step, the steel slag tailings after the iron separation treatment by the steel mill are sieved, wherein the sieving allowance after sieving by a 5mm mesh sieve is less than 10%, and the maximum particle of the obtained steel slag is not more than 8 mm;
secondly, loading the steel slag obtained by screening to prepare for steaming, wherein the thickness of a material layer of the steel slag on a vehicle is not more than 1m, and if the thickness of the material layer of the steel slag on the vehicle is more than 1m, a vent groove needs to be arranged in the material layer;
thirdly, adding water accounting for 25-35% of the weight of the steel slag into the steel slag after loading, and uniformly stirring;
fourthly, carrying out autoclaved treatment on the steel slag added with water in a constant-temperature and constant-pressure environment for 3-6 hours to obtain modified steel slag, wherein the constant-temperature and constant-pressure environment is a saturated steam environment with the temperature of 170-187.9 ℃ and the pressure of 0.8-1.2 MPa;
the proportion of the modified steel slag to other materials is as follows according to the weight percentage: 15-40% of modified steel slag, 30-40% of fly ash or river sand, 15-30% of furnace slag and 8-15% of cement, lime or carbide mud.
2. The method for preparing autoclaved brick from modified steel slag according to claim 1, wherein the method comprises the following steps: after the modified steel slag and other materials are proportioned, 7-12% of water is added according to weight percentage, then the mixture is sent to an autoclaved brick production line to be stirred, digested and secondarily stirred, and is subjected to static pressure and exhaust under the forming pressure of 7-13Mpa to be made into a brick blank, and finally, the brick blank is autoclaved and cured to be a finished autoclaved brick.
3. The method for preparing autoclaved brick from modified steel slag according to claim 1, wherein the method comprises the following steps: after the modified steel slag and other materials are proportioned, 7-12% of water is added according to weight percentage, then the mixture is sent to an autoclaved brick production line to be stirred, aged and secondarily stirred, and is subjected to static pressure and exhaust at the forming pressure of 7-13Mpa to prepare a brick blank, and finally, the brick blank is subjected to autoclaved curing to obtain a finished autoclaved brick.
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| CN109456017A (en) * | 2018-11-01 | 2019-03-12 | 河北瑞天建材制造有限公司 | A kind of steam-pressing brisk and preparation method thereof |
| CN113087484A (en) * | 2020-01-15 | 2021-07-09 | 河南兴安新型建筑材料有限公司 | Novel green and environment-friendly carbonized brick made of solid waste carbide mud and steel slag and preparation method thereof |
| CN111958806A (en) * | 2020-08-18 | 2020-11-20 | 徐达胜 | Steel-making furnace waste steel slag recovery and forming method |
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| JPS6158849A (en) * | 1984-08-28 | 1986-03-26 | 株式会社神戸製鋼所 | Method and apparatus for accelerating steel slag ageing |
| CN1028015C (en) * | 1989-06-30 | 1995-03-29 | 上海第五钢铁厂 | Process and equipment for treating slag of revolving furnace |
| JPH0812384A (en) * | 1994-06-24 | 1996-01-16 | Kawasaki Steel Corp | Steam aging method of steelmaking slag |
| EP0718251A3 (en) * | 1994-12-12 | 1997-10-15 | Sumitomo Metal Ind | A method of aging steel-making slag and an apparatus for use in such a method |
| JP5673435B2 (en) * | 2011-08-16 | 2015-02-18 | 新日鐵住金株式会社 | Steelmaking slag treatment method |
| CN203582742U (en) * | 2013-11-29 | 2014-05-07 | 四川方大新型建材科技开发有限责任公司 | Still reaction kettle for modification treatment of steel slag |
| JP2017007880A (en) * | 2015-06-18 | 2017-01-12 | 株式会社神戸製鋼所 | Ageing method of steelmaking slag |
| CN105036672A (en) * | 2015-06-26 | 2015-11-11 | 安徽恒创环保建材有限公司 | Autoclaved fly-ash brick and manufacturing method thereof |
| CN107382116B (en) * | 2017-08-31 | 2019-10-18 | 盐城工学院 | A kind of high activity modified steel-making slag powder and its invariability treatment method |
| CN107447065A (en) * | 2017-10-11 | 2017-12-08 | 中冶节能环保有限责任公司 | A kind of cold conditions slag efficient stable processing unit and method |
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