CN112624680A - Baking-free static pressure slag soil brick and preparation method thereof - Google Patents
Baking-free static pressure slag soil brick and preparation method thereof Download PDFInfo
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- CN112624680A CN112624680A CN202110162897.8A CN202110162897A CN112624680A CN 112624680 A CN112624680 A CN 112624680A CN 202110162897 A CN202110162897 A CN 202110162897A CN 112624680 A CN112624680 A CN 112624680A
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- static pressure
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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
-
- 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
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Processing Of Solid Wastes (AREA)
- Treatment Of Sludge (AREA)
- Press-Shaping Or Shaping Using Conveyers (AREA)
Abstract
The application relates to the field of waste treatment, and particularly discloses a non-fired static pressure slag soil brick and a preparation method thereof. The non-fired static pressure slag-soil brick comprises 75-85% of mud cakes, 5-10% of cement, 0-5% of aggregates, 5-8% of Ninggang sludge and 2-5% of binders; the preparation method comprises the following steps: s1, putting the aggregate into a crusher for crushing; s2, weighing the raw materials according to the formula proportion, and uniformly mixing for later use; s3, pressing and forming the raw materials uniformly mixed in the step S2 to obtain the baking-free static pressure slag-soil brick; s4, curing the baking-free static pressure slag-clay brick in the step S3 at normal temperature; and S5, placing the baking-free static pressure residue soil brick subjected to standing curing in the S4 outdoors. The baking-free static pressure slag soil brick can be used as a building material and has good mechanical property; in addition, the preparation method has the advantages of simple process, suitability for industrial production and improvement of the utilization rate of resources.
Description
Technical Field
The application relates to the field of waste treatment, in particular to a non-fired static pressure slag-soil brick and a preparation method thereof.
Background
The construction process of the construction site relates to earthwork, excavation, piling and the like, a large amount of slurry is generated in the processes, and if the slurry is not processed in time, on one hand, the process of the project and the appearance of the whole project are influenced; on the other hand, the direct discharge of the slurry pollutes the environment.
According to the environmental protection requirement, the discharged slurry must meet the requirement. At present, the treatment modes of the slurry are various, one of the modes is to dehydrate the slurry to prepare a mud cake with extremely low water content, so that the occupied area of the slurry is reduced.
The mud cake can be used as a raw material for manufacturing the slag-soil brick, and the preparation method of the slag-soil brick comprises high-temperature sintering and baking-free static pressure. The high-temperature sintering mode can improve the structural strength of the slag-soil brick, but the high-temperature sintering mode has high energy consumption and higher production cost, and the slag-soil brick prepared by the baking-free static pressure mode does not meet the structural strength required by building materials.
Disclosure of Invention
In order to improve the structural strength of the baking-free brick while improving the resource utilization rate, the application provides the baking-free static pressure slag soil brick and the preparation method thereof.
In a first aspect, the application provides a non-fired static pressure slag-soil brick, which adopts the following technical scheme:
the non-fired static pressure slag-soil brick comprises the following components in percentage by mass: 80-90% of mud cakes, 5-10% of cement, 0-5% of aggregates, 2-5% of Ninggang sludge and 2-5% of binders.
By adopting the technical scheme, the baking-free static pressure slag-soil brick prepared by the method has good mechanical property and can be used as a building material, so that the utilization rate of resources is improved.
The mud cake is used as a main raw material, Ninggang sludge is added in the raw material, the Ninggang sludge and Ninggang sludge are industrial waste materials, particularly Ninggang sludge cannot be discharged at will, and if the Ninggang sludge is discharged at will, the environment is polluted. The Ninggang sludge is added into the raw materials, so that the mechanical property of the non-fired static pressure slag-clay brick can be improved, the utilization rate of resources is improved, and the probability of environmental pollution caused by random discharge of Ninggang sludge is reduced.
Preferably, the binder is polyurethane binder.
By adopting the technical scheme, the binder has the function of binding the raw materials together through the binding effect, so that the structural strength inside the baking-free static pressure slag-soil brick is improved.
The polyurethane adhesive has excellent rubber characteristics, can adapt to the adhesion of base materials with different thermal expansion coefficients, forms a soft and hard transition layer between the base materials, has strong adhesive force, and also has excellent buffering and damping functions.
Preferably, the kaolin clay also comprises 1-3 percent of kaolin.
By adopting the technical scheme, 1-3% of kaolin is added into the raw materials, so that the cohesiveness among the raw materials can be improved, and the structural strength inside the baking-free static pressure slag-soil brick is improved.
If the addition amount of the kaolin is too much, the phenomena of cracking and the like of the prepared baking-free static pressure residue soil brick can be caused.
In a second aspect, the application provides a preparation method of a non-fired static pressure slag-soil brick, which adopts the following technical scheme:
a preparation method of a baking-free static pressure slag-soil brick comprises the following preparation steps:
s1 powder crushing and screening
Crushing the aggregate;
s2, metering
Weighing the raw materials according to the formula proportion, and uniformly mixing for later use;
s3, static pressure forming
Pressing and molding the raw materials uniformly mixed in the step S2 to obtain a baking-free static pressure slag-soil brick;
s4, standing and maintaining
Curing the baking-free static pressure slag-clay brick in the step S3 at normal temperature for 3-4 days;
s5, maintaining outdoors
And (5) placing the baking-free static pressure residue soil brick subjected to standing maintenance in the step (S4) outdoors, and selling the baking-free static pressure residue soil brick after 7-10 days.
By adopting the technical scheme, the process is simple and suitable for industrial production, high-temperature sintering is not needed in the preparation process of the non-fired static pressure slag-soil brick, the raw materials for preparing the non-fired static pressure slag-soil brick contain a lot of waste materials, and the prepared non-fired static pressure slag-soil brick meets the mechanical strength required by building materials and has the mechanical strength similar to that of a common sintered brick.
The method adopts a mode of replacing grinding with more grinding and less grinding, and eliminates the traditional sand making equipment with high energy consumption while meeting the quality requirement of machine-made sand aggregate, thereby saving energy consumption, protecting environment and reducing production cost.
Preferably, the press molding in S3 selects a double-sided pressurized hydraulic brick machine.
By adopting the technical scheme, the prepared non-fired static pressure slag-soil brick is more compact by adopting a two-side pressurizing mode, and the gap inside the non-fired static pressure slag-soil brick is reduced, so that the structural strength inside the non-fired static pressure slag-soil brick is improved.
Preferably, the pressure for compression molding in S3 is 20-31.5MPa, and the time is 17-25S.
By adopting the technical scheme, the baking-free static pressure slag-soil brick obtained by compression molding under the pressure condition has good mechanical property.
Preferably, in S4, the unburned static-pressure slag-clay brick is placed indoors during normal-temperature curing.
By adopting the technical scheme, the burning-free static pressure slag soil brick is placed indoors for maintenance, and the influence of external environments such as exposure, exposure and the like on various performances of the burning-free static pressure slag soil brick is avoided, so that the mechanical property of the burning-free static pressure slag soil brick is ensured.
Meanwhile, the baking-free static pressure slag-soil brick is maintained at normal temperature without being placed in a constant temperature furnace, so that energy consumption is saved, and the production cost is reduced.
In summary, the present application has the following beneficial effects:
1. the baking-free static pressure slag soil brick takes the mud cakes as the main raw material and is added with Ning steel sludge, so that the mechanical property of the baking-free static pressure slag soil brick is ensured, and the utilization rate of resources is improved;
2. the method has the advantages that the baking-free static pressure mode is adopted, the process is very simple, the energy consumption is saved, the baking-free static pressure slag soil brick is cured at normal temperature after being pressed and formed, the prepared baking-free static pressure slag soil brick has good mechanical property, the energy consumption is saved while the performance of the baking-free static pressure slag soil brick is ensured, and the production cost is reduced;
3. the double-sided pressurized hydraulic brick press is preferably adopted in the application, the two sides of the brick press are pressurized, so that the prepared baking-free static pressure slag-soil brick is more compact, and the gaps inside the baking-free static pressure slag-soil brick are reduced, thereby improving the structural strength inside the baking-free static pressure slag-soil brick and achieving the structural strength required by building materials.
Detailed Description
The present application will be described in further detail with reference to examples.
The mud cake in the application is selected from the Lurun environmental science and technology (Ningbo) company, the polyurethane adhesive is selected from the Hubei Hengjing river chemical company, Ningbo sludge is selected from the Ningbo steel company, and the aggregate is selected from basalt macadam processed in Yuyao hongshiji stone yard.
Example 1
A preparation method of a baking-free static pressure slag-soil brick comprises the following preparation steps:
s1 powder crushing and screening
Putting the aggregate into a crusher for crushing, wherein the particle size of the crushed aggregate is less than 3 mm;
s2, metering
Weighing 80kg of mud cakes, 8kg of cement, 1kg of aggregate, 5kg of Ning steel sludge, 4kg of polyurethane binder and 2kg of kaolin according to the formula proportion, and uniformly mixing for later use;
wherein the particle size of the aggregate is less than 10 mm;
s3, static pressure forming
Pressing the uniformly mixed raw materials in the step S2 by using a double-sided pressurized hydraulic brick press, wherein the pressure of the baking-free static pressure slag-soil brick is 25MPa, and the pressing time is 20S, so as to obtain a formed brick;
s4, standing and maintaining
Curing the formed brick in the step S3 at normal temperature for 3-4 days, and placing the baking-free static pressure slag brick indoors during curing;
s5, maintaining outdoors
And (5) placing the baking-free static pressure residue soil brick subjected to standing maintenance in the step (S4) outdoors, and selling the baking-free static pressure residue soil brick after 7-10 days.
Examples 2 to 5
The baking-free static pressure clinker bricks of examples 2-5 were prepared in the same manner as in example 1, except that the bricks were prepared as shown in Table 1:
TABLE 1 raw material composition and dosage of non-fired static pressure slag-soil brick of examples 1-5
| Raw material/kg | Example 1 | Example 2 | Example 3 | Example 4 | Example 5 |
| Mud cake | 80 | 75 | 85 | 75 | 82 |
| Cement | 8 | 5 | 5 | 5 | 5 |
| Aggregate material | 1 | 5 | 2 | - | 5 |
| Ning steel sludge | 5 | 8 | 5 | 8 | 5 |
| Polyurethane adhesive | 4 | 5 | 2 | 4 | 2 |
| Kaolin clay | 2 | 2 | 1 | 3 | 1 |
Example 6
The preparation method of the non-fired static pressure slag-soil brick in the embodiment is the same as that of the embodiment 1, and the difference is that the pressure of the compression molding in the S3 is 20MPa, and the time is 25S.
Example 7
The preparation method of the non-fired static pressure slag-soil brick in the embodiment is the same as that of the embodiment 1, and the difference is that the pressure of the compression molding in the S3 is 31.5MPa, and the time is 17S.
Example 8
The preparation method of the non-fired static pressure slag-soil brick in the embodiment is the same as that of the embodiment 1, and the difference is that kaolin is not added in the raw materials.
Comparative example 1
The preparation method of the non-fired static pressure slag-soil brick in the comparative example is the same as that of the example 1, except that the pressure of the press molding in the S3 is 15MPa and the time is 20S.
Comparative example 2
The preparation method of the non-fired static pressure slag-soil brick in the comparative example is the same as that of example 1, except that the pressure of the press molding in S3 is 35MPa and the time is 20S.
Comparative example 3
The preparation method of the baking-free static pressure slag soil brick in the comparative example is the same as that of the example 1, and the difference is that the Ninggang sludge is not added in the raw materials.
Comparative example 4
The preparation method of the baking-free static pressure slag soil brick in the comparative example is the same as that of the example 1, and the difference is that the baking-free static pressure slag soil brick in the S3 is cured outdoors for 3 days in S4.
Performance test
Compressive strength: performing the test according to GB/T2542-;
surface quality: visually observing the surfaces of the baking-free static pressure slag soil bricks of the examples 1-8 and the comparative examples 1-4, setting the bricks with regular shapes and no obvious cracks as grade A, and setting the bricks with regular shapes and slight cracks as grade B; the bricks with regular shapes and obvious cracks in local parts are defined as C grades, and the bricks with irregular shapes or cracks in large areas are defined as D grades.
TABLE 2 test results of examples 1 to 8 and comparative examples 1 to 4
| Test items | Compressive strength (MPa) | Surface quality |
| Example 1 | 25.16 | A |
| Example 2 | 26.54 | A |
| Example 3 | 24.92 | A |
| Example 4 | 24.61 | A |
| Example 5 | 24.87 | A |
| Example 6 | 24.16 | B |
| Example 7 | 25.67 | A |
| Example 8 | 24.66 | B |
| Comparative example 1 | 23.71 | C |
| Comparative example 2 | 25.97 | A |
| Comparative example 3 | 24.98 | A |
| Comparative example 4 | 21.61 | D |
It can be seen from the combination of examples 1-5 and table 2 that the non-fired static pressure slag-soil bricks of examples 1-5 adopt a non-fired static pressure mode, so that the energy consumption is reduced, the production cost is saved, and the prepared non-fired static pressure slag-soil bricks have good mechanical properties, have no obvious cracking phenomenon on the surfaces, and meet the structural strength of building materials.
It can be seen from the combination of examples 1 and 6-7 and table 2 that the pressure conditions of the unburned static-pressure slag-soil bricks in examples 1 and 6-7 are both in the range of 20-31.5MPa, and the unburned static-pressure slag-soil bricks formed by pressing under the conditions have higher compressive strength.
It can be seen from the combination of examples 1 to 5 and comparative examples 1 to 2 and table 2 that the compressive strength of the non-fired static pressure slag soil brick in comparative example 1 is significantly lower than that of the non-fired static pressure slag soil brick in example 1, and the compressive strength of the non-fired static pressure slag soil brick in comparative example 2 is significantly higher than that of the non-fired static pressure slag soil brick in example 1, which indicates that the compressive strength of the non-fired static pressure slag soil brick is related to the pressure condition of press forming, and the compressive strength of the non-fired static pressure slag soil brick is increased along with the increase of the forming pressure.
The reason for this is that: along with the increase of the molding pressure, the more compact the particles in the baking-free static pressure slag-soil brick are, the more compact the internal structure of the baking-free static pressure slag-soil brick is, so that the prepared baking-free static pressure slag-soil brick has good compressive strength.
However, the higher the forming pressure is, the higher the requirements on the structure and the material of the forming equipment are, and the larger the power consumption is. From the economic perspective, on the premise of ensuring the structural strength of the baking-free static pressure residue soil brick, the forming pressure is reduced as much as possible, thereby avoiding the waste of resources and the loss of energy.
It can be seen from the combination of example 1 and example 8 and table 2 that the compressive strength of the baking-free static pressure slag brick can be improved by adding kaolin, and the surface quality grade of example 8 is B, which shows that the mechanical properties of the baking-free static pressure slag brick can be improved by adding kaolin to improve the cohesiveness of the raw materials.
By combining the example 1 and the comparative example 3 and combining the table 2, the compressive strength of the baking-free static pressure slag soil brick is slightly improved by adding the Ninggang sludge, and the surface quality of the comparative example 3 is not obviously changed.
It can be seen from the combination of example 1 and comparative example 4 and table 2 that the burning-free static pressure slag-soil brick in comparative example 4 is directly placed outdoors for curing, the measured compressive strength is obviously lower than that of the burning-free static pressure slag-soil brick in example 1, and the surface quality grade of comparative example 4 is a, which indicates that the burning-free static pressure slag-soil brick needs to be placed indoors for curing after being pressed and formed, and the mechanical properties of the burning-free static pressure slag-soil brick are greatly influenced by the outside world during the period.
The present embodiment is only for explaining the present application, and it is not limited to the present application, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present application.
Claims (8)
1. The non-fired static pressure slag-soil brick is characterized by comprising the following components in parts by mass: 75-85% of mud cakes, 5-10% of cement, 0-5% of aggregate, 5-8% of Ninggang sludge and 2-5% of binder.
2. The non-fired static pressure slag-soil brick as claimed in claim 1, wherein: the binder is a polyurethane binder.
3. The non-fired static pressure slag-soil brick as claimed in claim 1, wherein: also comprises 1-3% of kaolin.
4. The non-fired static pressure slag-soil brick as claimed in claim 1, wherein: the particle size of the aggregate is less than 3 mm.
5. The process for preparing a non-fired static pressure slag-soil brick as claimed in any one of claims 1 to 4, which comprises the following steps:
s1 powder crushing and screening
Crushing the aggregate;
s2, metering
Weighing the raw materials according to the formula proportion, and uniformly mixing for later use;
s3, static pressure forming
Pressing and molding the raw materials uniformly mixed in the step S2 to obtain a baking-free static pressure slag-soil brick;
s4, standing and maintaining
Curing the baking-free static pressure slag-clay brick in the step S3 at normal temperature for 3-4 days;
s5, maintaining outdoors
And (5) placing the baking-free static pressure residue soil brick subjected to standing maintenance in the step (S4) outdoors, and selling the baking-free static pressure residue soil brick after 7-10 days.
6. The preparation method of the baking-free static pressure slag-soil brick according to claim 5, which is characterized in that: s3 pressing into mold, selecting a double-sided pressurized hydraulic brick machine.
7. The non-fired static pressure slag-soil brick as claimed in claim 5, wherein: the pressure of the compression molding in the S3 is 20-31.5MPa, and the time is 17-25S.
8. The non-fired static pressure slag-soil brick as claimed in claim 5, wherein: and S4, placing the baking-free static pressure slag-soil brick indoors during normal-temperature curing.
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| CN202110162897.8A CN112624680A (en) | 2021-02-05 | 2021-02-05 | Baking-free static pressure slag soil brick and preparation method thereof |
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2021
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Application publication date: 20210409 |