CN111153617A - Regenerated composite admixture utilizing construction waste and preparation method thereof - Google Patents
Regenerated composite admixture utilizing construction waste and preparation method thereof Download PDFInfo
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- CN111153617A CN111153617A CN202010014902.6A CN202010014902A CN111153617A CN 111153617 A CN111153617 A CN 111153617A CN 202010014902 A CN202010014902 A CN 202010014902A CN 111153617 A CN111153617 A CN 111153617A
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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
- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/0028—Aspects relating to the mixing step of the mortar preparation
- C04B40/0039—Premixtures of ingredients
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C21/00—Disintegrating plant with or without drying of the material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C23/00—Auxiliary methods or auxiliary devices or accessories specially adapted for crushing or disintegrating not provided for in preceding groups or not specially adapted to apparatus covered by a single preceding group
- B02C23/06—Selection or use of additives to aid disintegrating
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C23/00—Auxiliary methods or auxiliary devices or accessories specially adapted for crushing or disintegrating not provided for in preceding groups or not specially adapted to apparatus covered by a single preceding group
- B02C23/08—Separating or sorting of material, associated with crushing or disintegrating
- B02C23/14—Separating or sorting of material, associated with crushing or disintegrating with more than one separator
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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
- C04B20/026—Comminuting, e.g. by grinding or breaking; Defibrillating fibres other than asbestos
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C2201/00—Codes relating to disintegrating devices adapted for specific materials
- B02C2201/06—Codes relating to disintegrating devices adapted for specific materials for garbage, waste or sewage
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- 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
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Ceramic Engineering (AREA)
- Food Science & Technology (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The invention discloses a regenerative composite admixture utilizing construction waste, which is prepared from the following raw materials in parts by weight: 30 parts of concrete, 40 parts of sintered bricks, 10 parts of decoration slag, 5 parts of fly ash, 10 parts of electric furnace steel slag, 5 parts of basalt and 0.125 part of grinding aid; the invention also provides a preparation method of the regenerated composite admixture utilizing the construction waste.
Description
Technical Field
The invention relates to the technical field of construction waste recycling, in particular to a recycled composite admixture using construction waste and a preparation method thereof.
Background
With the continuous development of urban construction, the amount of waste is increased, and the recycling of construction waste is not slow. The construction waste refers to waste concrete/mortar/brick/tile/glass/ceramic, waste soil, waste material and other wastes generated in the process of building, rebuilding, expanding and dismantling various buildings, structures, pipe networks and the like of construction units and house decoration and finishing of residents. The method has incomplete statistics, and the quantity of the construction waste generated in the urban construction process of China accounts for 30-40% of the total quantity of the urban waste, so that the construction waste becomes a first large urban waste source. However, at present, the recycling rate of the construction waste is only thousands of tons, the recycling rate is less than 5%, most of the construction waste is directly transported to the suburbs without being processed for open-air stacking or landfill, and the suburbs of many cities are often the stacking places of the construction waste.
In the period of high-speed urbanization development of China, a large amount of construction waste is generated along with urban area reconstruction and expansion, shed house area reconstruction and the like, and waste surrounding is boosted. The construction waste is not only treated harmlessly, but also recycled, otherwise, the problem is difficult to be solved substantially. Developed countries and regions have made a lot of work on recycling construction waste, and compared with the proportion of less than 5% of the construction waste in China, the proportion of 90% in European Union, 97% in Japan, 97% in Korea and more than 75% in America is also in the United states. Practices in other developed countries and regions indicate that construction waste is a usable material and a resource for misplaced places. The most effective recycling of the construction waste is also the most suitable field in the building material industry.
Therefore, a regenerated composite admixture utilizing construction waste and a preparation method thereof, which have simple process and high utilization rate, are urgently needed to be provided. The building material can be developed sustainably while the construction waste is recycled.
Disclosure of Invention
Aiming at the problems, the invention aims to provide a regenerated composite admixture utilizing construction waste and a preparation method thereof, and the technical scheme adopted by the invention is as follows:
a regenerated composite admixture utilizing construction waste is prepared from the following raw materials in parts by weight:
building garbage: 75-85 parts of a solvent;
fly ash: 3-7 parts;
electric furnace steel slag: 10-15 parts;
basalt: 5-10 parts.
Preferably, the construction waste is concrete, baked bricks and decoration slag, and the regenerated composite admixture is prepared from the following raw materials in parts by weight:
concrete: 30 parts of (1);
and (3) sintering the brick: 40 parts of a mixture;
decorating slag: 10 parts of (A);
fly ash: 5 parts of a mixture;
electric furnace steel slag: 10 parts of (A);
basalt: 5 parts of the raw materials.
Further, the regenerated composite admixture utilizing the construction waste also comprises 0.125 part of grinding aid.
A preparation method of a regenerated composite admixture utilizing construction waste comprises the following steps:
pretreatment of construction waste: crushing, deironing, screening and classifying the construction waste to obtain construction waste particles with the particle diameter of 20-50mm, and stacking the concrete, the sintered bricks and the decoration slag in a classified manner for later use;
pretreatment of electric furnace steel slag: extracting original electric furnace steel slag with the particle size of 100-500 mm obtained by electric furnace smelting, crushing the original electric furnace steel slag by a multi-stage jaw crusher, and removing iron to obtain electric furnace steel slag with the particle size of less than or equal to 10mm for later use;
grinding by a roller press: adding 75-85 parts of construction waste, 10-15 parts of electric furnace steel slag and 5-10 parts of basalt into a roller press grinding system for grinding to obtain particles with the specific surface area of 200-300 m2(ii) a/kg mixture and removing iron from the mixture;
grinding by a ball mill: adding the mixture obtained by grinding in a roller press and 3-7 parts of fly ash into a ball mill for grinding to obtain particles with the specific surface area of 700-1000 m2Per kg of recycled complex admixture.
Preferably, the crushing and iron removal treatment by the multi-stage jaw crusher comprises the following steps:
first-stage crushing and iron removal: extracting original electric furnace steel slag with the particle size of 100-500 mm obtained by smelting in an electric furnace, and crushing the original electric furnace steel slag into first-stage electric furnace steel slag with the particle size of 70-100 mm by using a first-stage jaw crusher; removing iron in the first-stage electric furnace steel slag by using an iron remover, and transmitting the first-stage electric furnace steel slag to a second-stage crushing iron removal device;
and (3) crushing and deironing in the second stage: inputting the first-stage electric furnace steel slag into a second-stage jaw crusher, crushing the first-stage electric furnace steel slag into second-stage electric furnace steel slag with the grain size of 30-40 mm, removing iron in the second-stage electric furnace steel slag by using an iron remover, and transmitting the second-stage electric furnace steel slag to a third stage for crushing and removing iron;
and (3) crushing and deironing at the third stage: and (3) inputting the second-stage electric furnace steel slag into a third-stage jaw crusher, crushing, sorting by using a 10mm screen to obtain the electric furnace steel slag with the particle size of less than or equal to 10mm, and recycling the steel slag with the particle size of more than 10mm to the third-stage crushing until the material with the qualified particle size is screened out.
Preferably, 0.125 parts of grinding aid is also added to the roller press.
And further, in the milling stage of the roller press, adding the basalt with the particle size of 30-40 mm after crushing.
Compared with the prior art, the invention has the following beneficial effects:
(1) the invention skillfully removes impurities such as steel, plastics, wood, cloth and the like in the construction waste through crushing, iron removal and screening processes;
(2) the electric furnace steel slag has high iron content, wherein Fe2O3The content is about 40 percent, the invention removes iron by three-stage crushing, and can recycle Fe while utilizing the electric furnace steel slag2O3(ii) a The invention removes iron by three-stage crushing and grinding with a roller press, so that the removal is cleaner; if Fe2O3If the content is too high, the production equipment of the regenerated composite admixture is seriously abraded, and the product quality of the regenerated composite admixture is influenced; the invention skillfully adopts a 4-time deferrization process, which can effectively avoid the problems.
(3) Concrete, sintered bricks and decoration slag are skillfully adopted as raw materials, and as the construction waste contains unhydrated gelled materials and substances with poor amorphous and crystallinity in the sintered clay bricks, the materials have certain activity, namely belong to active materials; the specific surface area of the powder is 700-1000 m2The/kg micro powder is used as an admixture in cement and concrete and has certain activity.
(4) The invention skillfully adopts the electric furnace steel slag and the fly ash as raw materials, wherein the electric furnace steel slag and the fly ash both belong to active materials and have coke black color; because the construction waste contains more sintered red bricks, the micro powder is reddish after being ground; the electric furnace slag and the fly ash in the invention can play a role in adjusting the color of micro powder while serving as active materials, the electric furnace slag has higher iron content and poorer grindability, the concrete, sintered bricks and decoration slag which are matched in proportion have better grindability, and the regenerated composite admixture produced by utilizing the characteristic of the electric furnace slag has wider strength distribution, can play an important role in material compact accumulation when being used as a concrete admixture, and enables the concrete strength to be higher.
(5) The basalt of the invention is a basic extrusive rock, belongs to a natural pozzolanic material, and has activity; among them, SiO in basalt2The content is changed between 45 percent and 52 percent, K2O+Na2The content of O is slightly higher than that of the invaded rock, CaO and Fe2O3The content of the + FeO and MgO is slightly lower than that of the invaded rock. The mineral components mainly comprise basic feldspar and pyroxene, the secondary minerals comprise olivine, amphibole, biotite and the like, and the rocks are dark and generally black; meanwhile, the basalt can also play a role in adjusting the color of the micro powder.
(6) The grinding aid is introduced, so that the grinding resistance is mainly reduced, and the aggregation of particles is prevented; the grinding aid is adsorbed on the surface of the material through physical chemistry, so that the friction force and the adhesive force between particles are reduced, and the material particles are ensured to be fully contacted and ground, so that higher specific surface area is achieved.
In conclusion, the invention fills the technical blank of building waste as the regenerated composite admixture, realizes the recycling of the building waste, and has high practical value and popularization value in the technical field of building waste recycling.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope of protection, and it is obvious for those skilled in the art that other related drawings can be obtained according to these drawings without inventive efforts.
FIG. 1 is a process flow diagram of the present invention.
FIG. 2 is a flow chart of the construction waste pretreatment process of the present invention.
FIG. 3 is a flow chart of the raw material preparation process of the present invention.
FIG. 4 is a flow chart of the milling process of the present invention.
FIG. 5 is a flow chart of the discharge process of the regenerated admixture composition of the present invention.
FIG. 6 is a particle distribution diagram of the reclaimed composite admixture using electric furnace slag according to the present invention.
Detailed Description
To further clarify the objects, technical solutions and advantages of the present application, the present invention will be further described with reference to the accompanying drawings and examples, and embodiments of the present invention include, but are not limited to, the following examples. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Examples
As shown in fig. 1 to 6, the recycled composite admixture using construction waste and the preparation method thereof of the present embodiment are prepared from the following raw materials in parts by weight: 30 parts of concrete, 40 parts of sintered bricks, 10 parts of decoration slag, 5 parts of fly ash, 10 parts of electric furnace steel slag, 5 parts of basalt and 0.125 part of grinding aid. The preparation process is described in detail below:
raw material pretreatment:
(1) pretreatment of construction waste: crushing, deironing and screening the construction waste to obtain construction waste particles with particle diameters of 20-50 mm; wherein, the construction waste is divided into concrete, sintered bricks and tiles and decoration slag. In the embodiment, the construction waste is subjected to a crushing and impurity removing process, and the construction waste crushed into construction slag particles with the particle size of 20-50mm is conveyed to a storage bin through a homogenizing and distributing machine for storage and use.
(2) Pretreatment of electric furnace steel slag: extracting original electric furnace steel slag with the particle size of 100-500 mm obtained by electric furnace smelting, crushing the original electric furnace steel slag by a multi-stage jaw crusher, and removing iron to obtain electric furnace steel slag with the particle size of less than or equal to 10mm for later use; wherein, this embodiment adopts tertiary broken deironing to handle:
first-stage crushing and iron removal: extracting original electric furnace steel slag with the particle size of 100-500 mm obtained by smelting in an electric furnace, and crushing the original electric furnace steel slag into first-stage electric furnace steel slag with the particle size of 70-100 mm by using a first-stage jaw crusher; removing iron in the first-stage electric furnace steel slag by using an iron remover, and transmitting the first-stage electric furnace steel slag to a second-stage crushing iron removal device;
and (3) crushing and deironing in the second stage: inputting the first-stage electric furnace steel slag into a second-stage jaw crusher, crushing the first-stage electric furnace steel slag into second-stage electric furnace steel slag with the grain size of 30-40 mm, removing iron in the second-stage electric furnace steel slag by using an iron remover, and transmitting the second-stage electric furnace steel slag to a third stage for crushing and removing iron;
and (3) crushing and deironing at the third stage: and (3) inputting the second-stage electric furnace steel slag into a third-stage jaw crusher, crushing, sorting by using a 10mm screen to obtain the electric furnace steel slag with the particle size of less than or equal to 10mm, and recycling the steel slag with the particle size of more than 10mm to the third-stage crushing until the material with the qualified particle size is screened out.
(II) the production process:
grinding by a roller press: adding 30 parts of concrete, 40 parts of sintered bricks, 10 parts of decoration slag and 0.125 part of grinding aid into a roller press grinding system for grinding to obtain particles with specific surface area of 200-300 m2(ii) a/kg mixture and removing iron from the mixture; because Fe also exists in the electric furnace steel slag obtained by pretreatment2O3In order to effectively solve the problems that iron wears production equipment, influences product quality and the like, the roller press is used for extruding the electric furnace steel slag into powder in the process of producing the regenerative composite admixture, and then iron is removed again.
Grinding by a ball mill: grinding the mixture obtained by the roller press and 5 parts of fly ash into powder in a ball mill to obtain particles with specific surface area of 700-1000 m2Per kg of recycled complex admixture.
In this example, the classification and main chemical composition of the construction waste are as follows:
in order to verify the physical properties of the recycled composite admixtures, several performance tests were performed according to the requirements of JG/T486-2015, and the test results are shown in the following table:
repeated tests prove that the average performance parameters of the regenerated composite admixture product are as follows: the specific surface area is 722m2The specific surface area of the product can be increased according to the needs, and the 45um screen residue is as follows: 10.6 percent, the activity in 28 days is 80 percent, the increase ratio of the compressive strength of the mortar is 1.06, and the increase ratio is higher than the technical indexes of the composite mineral admixture given in JG/T486-2015.
In order to verify that the regenerated composite admixture can replace the traditional fly ash and mineral powder, the regenerated composite admixture is specially added into low-grade and high-grade concrete and is subjected to performance tests, and the test results are as follows:
(I) test results on Low-grade concrete
And (3) analyzing test results: group 1 reference concrete
From the initial and 3-hour workability of the above groups of concrete, when the regenerated composite admixture respectively replaces the reference coal ash and the mineral powder, the admixture dosage is 0.1 percent lower than the reference, and when the regenerated composite admixture is completely replaced, the admixture dosage is 0.2 percent lower than the reference; the formula and the workability of the doped regeneration composite admixture are good, and the 3h slump, the expansion and the workability are better than the standard. The test result shows that the strength of the low-grade concrete 28d is not reduced and is partially increased after the regenerated composite admixture is used.
(II) high-grade concrete test results
And (3) analyzing test results: group 1 reference concrete
From the initial and 3-hour workability of the above groups of concrete, when the regenerated composite admixture respectively replaces the reference coal ash and the mineral powder, the admixture dosage is 0.1 percent lower than the reference, but the water consumption is higher than the reference group; when the additive is completely replaced, the doping amount of the additive is 0.2 percent lower than the reference, the formula workability of the regenerated composite admixture is good, and the slump constant and the extensibility within 3 hours are good. The test result shows that the strength of the high-grade concrete 28d is not reduced and is partially increased after the regenerated composite admixture is used.
In conclusion, the performance test of the regenerated composite admixture and the performance test of the concrete using the regenerated composite admixture verify that the regenerated composite admixture can replace fly ash and mineral powder in the existing concrete.
The above-mentioned embodiments are only preferred embodiments of the present invention, and do not limit the scope of the present invention, but all the modifications made by the principles of the present invention and the non-inventive efforts based on the above-mentioned embodiments shall fall within the scope of the present invention.
Claims (7)
1. The recycled composite admixture utilizing the construction waste is characterized by being prepared from the following raw materials in parts by weight:
building garbage: 75-85 parts of a solvent;
fly ash: 3-7 parts;
electric furnace steel slag: 10-15 parts;
basalt: 5-10 parts.
2. The recycled composite admixture utilizing construction wastes according to claim 1, wherein the construction wastes are concrete, baked bricks and decoration slag, and the recycled composite admixture is prepared from the following raw materials in parts by weight:
concrete: 30 parts of (1);
and (3) sintering the brick: 40 parts of a mixture;
decorating slag: 10 parts of (A);
fly ash: 5 parts of a mixture;
electric furnace steel slag: 10 parts of (A);
basalt: 5 parts of the raw materials.
3. The recycling composite admixture for construction waste as claimed in claim 2, further comprising 0.125 parts of grinding aid.
4. A preparation method of a regenerated composite admixture utilizing construction waste is characterized by comprising the following steps:
pretreatment of construction waste: crushing, deironing, screening and classifying the construction waste to obtain construction waste particles with the particle diameter of 20-50mm, and stacking the concrete, the sintered bricks and the decoration slag in a classified manner for later use;
pretreatment of electric furnace steel slag: extracting original electric furnace steel slag with the particle size of 100-500 mm obtained by electric furnace smelting, crushing the original electric furnace steel slag by a multi-stage jaw crusher, and removing iron to obtain electric furnace steel slag with the particle size of less than or equal to 10mm for later use;
grinding by a roller press: adding 75-85 parts of construction waste, 10-15 parts of electric furnace steel slag and 5-10 parts of basalt into a roller press grinding system for grinding to obtain particles with the specific surface area of 200-300 m2(ii) a/kg mixture and removing iron from the mixture;
grinding by a ball mill: adding the mixture obtained by grinding in a roller press and 3-7 parts of fly ash into a ball mill for grinding to obtain particles with the specific surface area of 700-1000 m2Per kg of recycled complex admixture.
5. The method for preparing the recycled composite admixture using the construction waste as claimed in claim 4, wherein the crushing and iron removal treatment by the multi-stage jaw crusher comprises the following steps:
first-stage crushing and iron removal: extracting original electric furnace steel slag with the particle size of 100-500 mm obtained by smelting in an electric furnace, and crushing the original electric furnace steel slag into first-stage electric furnace steel slag with the particle size of 70-100 mm by using a first-stage jaw crusher; removing iron in the first-stage electric furnace steel slag by using an iron remover, and transmitting the first-stage electric furnace steel slag to a second-stage crushing iron removal device;
and (3) crushing and deironing in the second stage: inputting the first-stage electric furnace steel slag into a second-stage jaw crusher, crushing the first-stage electric furnace steel slag into second-stage electric furnace steel slag with the grain size of 30-40 mm, removing iron in the second-stage electric furnace steel slag by using an iron remover, and transmitting the second-stage electric furnace steel slag to a third stage for crushing and removing iron;
and (3) crushing and deironing at the third stage: and (3) inputting the second-stage electric furnace steel slag into a third-stage jaw crusher, crushing, sorting by using a 10mm screen to obtain the electric furnace steel slag with the particle size of less than or equal to 10mm, and recycling the steel slag with the particle size of more than 10mm to the third-stage crushing until the material with the qualified particle size is screened out.
6. The method for preparing the recycled composite admixture using the construction waste as claimed in claim 4, wherein 0.125 parts of grinding aid is further added into the rolling mill.
7. The preparation method of the recycled composite admixture using the construction waste as claimed in claim 4, wherein basalt with a particle size of 30-40 mm after crushing is added in the milling stage of the roller press.
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| CN111847945A (en) * | 2020-07-29 | 2020-10-30 | 广东通兴再生资源科技有限公司 | Construction waste recycling method |
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