CN113912314B - Preparation method of high-quality recycled aggregate - Google Patents
Preparation method of high-quality recycled aggregate Download PDFInfo
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- CN113912314B CN113912314B CN202111196301.2A CN202111196301A CN113912314B CN 113912314 B CN113912314 B CN 113912314B CN 202111196301 A CN202111196301 A CN 202111196301A CN 113912314 B CN113912314 B CN 113912314B
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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
- C04B20/023—Chemical 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
- 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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- 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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Abstract
The invention belongs to the field of construction waste processing, in particular to a preparation method of high-quality recycled aggregate, which aims at solving the problems of low water absorption and low crushing index of the existing method and provides the following scheme, comprising the following steps: mixing 100 parts of plant ash, 45-50 parts of lime powder, 40-45 parts of quartz powder, 11-15 parts of sodium silicate, 6-10 parts of potassium hydroxide, 5-9 parts of methyl silicic acid and 100-120 parts of ethanol to prepare a strengthening solution, mixing 10-15 parts of lime powder, 5-10 parts of caustic soda, 1-2 parts of iron tailing powder and 200 parts of water to prepare an auxiliary solution, stimulating the aggregate through the auxiliary solution, activating the activity of the aggregate, strengthening the absorption capacity of the aggregate, absorbing the aggregate by the strengthening solution, strengthening the strength of the aggregate, and improving the water absorption rate and crushing index of the aggregate by proper temperature and pressure change.
Description
Technical Field
The invention relates to the technical field of construction waste processing, in particular to a preparation method of high-quality recycled aggregate.
Background
A large amount of construction waste is generated in the urban development process, the construction waste is mainly concrete, a method for treating the construction waste in large amount is provided in consideration of environmental protection, and a patent with the application number of CN201810690973.0 discloses a preparation method of carbonized recycled aggregate for inhibiting alkali-aggregate reaction. On the basis of realizing effective utilization of the recycled aggregate, the invention further improves the utilization value of the recycled aggregate and has important significance for realizing sustainable development of concrete.
However, the preparation method of the carbonized recycled aggregate for inhibiting the alkali-aggregate reaction has some problems, such as poor water absorption, small strength, low crushing index, fragility, easy crushing, poor mechanical property, influence on the normal use of the recycled aggregate, failure in enhancing the strength of concrete after being made into concrete, and low use value.
Disclosure of Invention
Based on the problems of poor water absorption, low strength, low crushing index, fragility and easiness in crushing in the background technology, the invention provides a preparation method of a high-quality recycled aggregate.
The invention provides a preparation method of high-quality recycled aggregate, which comprises the following steps:
s1: mixing 100 parts of plant ash, 45-50 parts of lime powder, 40-45 parts of quartz powder, 11-15 parts of sodium silicate, 6-10 parts of potassium hydroxide, 5-9 parts of methyl silicic acid and 100-120 parts of ethanol to prepare a strengthening solution, and mixing 10-15 parts of lime powder, 5-10 parts of caustic soda, 1-2 parts of iron tailing powder and 200 parts of water to prepare an auxiliary solution;
s2: pouring the construction waste into crushing equipment for primary crushing, removing materials such as internal reinforcing steel bars and the like through a screening device after crushing is finished, then putting the construction waste without the reinforcing steel bars into the crushing equipment again for crushing until the diameter of crushed particles is controlled to be 10-35 mm to obtain crushed particles, then putting the crushed particles into the screening device for secondary screening, and removing wood, plastic, glass, paper scraps and metal particles in the particles to obtain primary aggregate;
s3: pouring the auxiliary solution into the primary aggregate, wherein the auxiliary solution is required to completely submerge the primary aggregate, heating the primary aggregate at the same time, controlling the temperature to be 45-55 ℃, soaking the primary aggregate for 15-25 minutes, stopping heating, continuing to soak the primary aggregate for 60-90 minutes, and finally filtering the primary aggregate;
s4: mixing the strengthening solution with water according to the proportion of 1:3-5 to obtain a mixed solution, heating the mixed solution to 35-40 ℃, putting the mixed solution and the primary aggregate into a processing container, wherein the mixed solution is required to completely submerge the primary aggregate;
s5: firstly, pumping out air in a processing container through a vacuum pump to enable the interior of the processing container to be in a negative pressure state, keeping the negative pressure for 10-15 minutes, injecting gas into the processing container through a pressure pump to enable the processing container to be in a high pressure state, keeping the high pressure for 30-60 minutes, slowly releasing the pressure, continuing to soak for 180-300 minutes after the pressure in the processing container is consistent with the outside, taking out the primary aggregate, and drying to obtain the high-quality recycled aggregate.
Preferably, in S1, the preparation method of the strengthening solution comprises: adding plant ash, lime powder, quartz stone powder, sodium silicate, potassium hydroxide, methyl silicic acid and ethanol into stirring equipment according to a proportion, stirring and mixing, injecting inert gas as protective gas during stirring, controlling the stirring temperature at 40-50 ℃, and quickly mixing for 15-30 minutes at the rotating speed of 500-600 r/min by the stirring equipment.
Preferably, in S1, the preparation method of the auxiliary solution comprises: firstly heating water to 70-80 ℃, then adding iron tailing powder, quickly mixing for 5-15 minutes, then adding lime powder and caustic soda, continuously and quickly mixing for 10-20 minutes, stopping heating, continuously stirring until the temperature is reduced to 55-65 ℃, preparing an auxiliary solution, and pouring the auxiliary solution into a heat preservation box for heat preservation.
Preferably, in S2, when removing the metal, the broken particles are screened out by using an eddy current separator or a magnetic separator.
Preferably, in the step S2, the preliminary aggregate is screened again finally, and granular powder with a particle diameter smaller than 2mm in the preliminary aggregate is removed.
Preferably, in S3, the preliminary aggregate is dried by sun exposure or heating with a device, and the temperature of the auxiliary solution is kept at 40-65 ℃ when the auxiliary solution is mixed with the preliminary aggregate.
Preferably, in S3, the preliminary aggregate is stirred for 15 to 30 seconds every 5 minutes after the auxiliary solution is poured into the preliminary aggregate.
Preferably, in S4, the temperature of the surface of the preliminary aggregate is controlled to be 35 to 45 ℃ before the preliminary aggregate is poured into the processing container.
Preferably, in S5, the pressure inside the processing container is controlled to be 0.05MPa to 0.15MPa at the time of negative pressure, and is controlled to be 3MPa to 6MPa at the time of high pressure.
Preferably, in S5, the temperature inside the processing container is controlled to be 35 to 45 ℃, and the heating is stopped for the last 45 to 60 minutes, followed by natural cooling.
The invention has the beneficial effects that:
the occurrence of other impurities in the aggregate can be reduced through multiple crushing and screening, the auxiliary solution can stimulate the aggregate, the activity of the aggregate is activated, the absorption capacity of the aggregate is enhanced, meanwhile, the aggregate can be absorbed by the strengthening solution, the strength of the aggregate is enhanced, and the absorption capacity of the aggregate to substances in the solution can be enhanced by using proper temperature and pressure change, so that the water absorption rate and the crushing index of the aggregate are improved.
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Fig. 1 is a flow chart of the present invention.
Detailed Description
The present invention will be further illustrated with reference to the following specific examples.
Referring to FIG. 1, the first embodiment
The embodiment provides a preparation method of high-quality recycled aggregate, which comprises the following steps:
s1: mixing 100 parts of plant ash, 50 parts of lime powder, 44 parts of quartz powder, 14 parts of sodium silicate, 10 parts of potassium hydroxide, 9 parts of methyl silicic acid and 115 parts of ethanol to prepare a strengthening solution, mixing 15 parts of lime powder, 10 parts of caustic soda, 2 parts of iron tailing powder and 200 parts of water to prepare an auxiliary solution, and preparing the strengthening solution: adding plant ash, lime powder, quartz stone powder, sodium silicate, potassium hydroxide, methyl silicic acid and ethanol into stirring equipment according to a proportion, stirring and mixing, injecting inert gas as protective gas during stirring, controlling the stirring temperature at 40-50 ℃, and quickly mixing for 15-30 minutes by the stirring equipment at a rotating speed of 500-600 r/min, wherein the preparation method of the auxiliary solution comprises the following steps: firstly, heating water to 70-80 ℃, then adding iron tailing powder, quickly mixing for 5-15 minutes, then adding lime powder and caustic soda, continuously and quickly mixing for 10-20 minutes, stopping heating, continuously stirring until the temperature is reduced to 55-65 ℃, preparing an auxiliary solution, and pouring the auxiliary solution into a heat preservation box for heat preservation;
s2: pouring the construction waste into crushing equipment for primary crushing, removing materials such as internal reinforcing steel bars through a screening device after crushing is finished, then putting the construction waste without the reinforcing steel bars into the crushing equipment again for crushing until the diameter of crushed particles is controlled to be 10-35 mm to obtain crushed particles, putting the crushed particles into the screening device for secondary screening to remove wood, plastic, glass, paper scraps and metal particles in the crushed particles to obtain primary aggregate, screening the metal particles by using an eddy current sorting machine or a magnetic sorting machine when the metal is removed, and finally screening the primary aggregate again to remove particle powder with the particle diameter smaller than 2mm in the primary aggregate;
s3: pouring an auxiliary solution into the primary aggregate, wherein the auxiliary solution is required to completely submerge the primary aggregate, heating is carried out simultaneously, the temperature is controlled to be 45-55 ℃, the heating is stopped after soaking for 15-25 minutes, the soaking is continued for 60-90 minutes, finally, the primary aggregate is filtered, the primary aggregate is subjected to sun exposure or device heating and drying in advance, the temperature is kept at 40-65 ℃ when the auxiliary solution is mixed with the primary aggregate, and the primary aggregate is stirred for 15-30 seconds every 5 minutes after the auxiliary solution is poured into the primary aggregate;
s4: mixing the strengthening solution with water according to the proportion of 1:3-5 to obtain a mixed solution, heating the mixed solution to 35-40 ℃, putting the mixed solution and primary aggregate into a processing container, wherein the mixed solution needs to completely submerge the primary aggregate, and before the primary aggregate is poured into the processing container, the temperature of the surface of the primary aggregate is controlled to be 35-45 ℃;
s5: firstly, pumping out air in a processing container through a vacuum pump to enable the interior of the processing container to be in a negative pressure state, keeping the negative pressure for 10-15 minutes, injecting gas into the processing container through a pressure pump to enable the processing container to be in a high pressure state, keeping the high pressure for 30-60 minutes, controlling the pressure in the processing container to be 0.05-0.15 MPa when the negative pressure is applied, controlling the pressure in the processing container to be 3-6 MPa when the high pressure is applied, slowly releasing the pressure, continuing to soak for 180-300 minutes after the pressure in the processing container is consistent with the outside, controlling the temperature in the processing container to be 35-45 ℃, finally stopping heating for 45-60 minutes, naturally cooling, taking out the aggregate and primarily drying to obtain the high-quality recycled aggregate.
Referring to FIG. 1, the second embodiment
The embodiment provides a preparation method of high-quality recycled aggregate, which comprises the following steps:
s1: mixing 100 parts of plant ash, 48 parts of lime powder, 44 parts of quartz powder, 13 parts of sodium silicate, 8 parts of potassium hydroxide, 8 parts of methyl silicic acid and 110 parts of ethanol to prepare a strengthening solution, mixing 13 parts of lime powder, 9 parts of caustic soda, 2 parts of iron tailing powder and 200 parts of water to prepare an auxiliary solution, and preparing the strengthening solution: adding plant ash, lime powder, quartz stone powder, sodium silicate, potassium hydroxide, methyl silicic acid and ethanol into stirring equipment according to a proportion, stirring and mixing, injecting inert gas as protective gas during stirring, controlling the stirring temperature at 40-50 ℃, and quickly mixing for 15-30 minutes by the stirring equipment at a rotating speed of 500-600 r/min, wherein the preparation method of the auxiliary solution comprises the following steps: firstly, heating water to 70-80 ℃, then adding iron tailing powder, quickly mixing for 5-15 minutes, then adding lime powder and caustic soda, continuously and quickly mixing for 10-20 minutes, stopping heating, continuously stirring until the temperature is reduced to 55-65 ℃, preparing an auxiliary solution, and pouring the auxiliary solution into a heat preservation box for heat preservation;
s2: pouring the construction waste into crushing equipment for primary crushing, removing materials such as internal reinforcing steel bars and the like through a screening device after crushing is finished, then putting the construction waste without the reinforcing steel bars into the crushing equipment again for crushing until the diameter of crushed particles is controlled to be 10-35 mm to obtain crushed particles, putting the crushed particles into the screening device for secondary screening to remove wood, plastics, glass, paper scraps and metal particles in the crushed particles so as to obtain primary aggregate, screening the metal particles by using an eddy current sorting machine or a magnetic sorting machine when the metal is removed, finally screening the primary aggregate again, and removing particle powder with the particle diameter smaller than 2mm in the primary aggregate;
s3: pouring an auxiliary solution into the primary aggregate, wherein the auxiliary solution is required to completely submerge the primary aggregate, heating is carried out simultaneously, the temperature is controlled to be 45-55 ℃, the heating is stopped after soaking for 15-25 minutes, the soaking is continued for 60-90 minutes, finally, the primary aggregate is filtered, the primary aggregate is subjected to sun exposure or device heating and drying in advance, the temperature is kept at 40-65 ℃ when the auxiliary solution is mixed with the primary aggregate, and the primary aggregate is stirred for 15-30 seconds every 5 minutes after the auxiliary solution is poured into the primary aggregate;
s4: mixing the strengthening solution with water according to the proportion of 1:3-5 to obtain a mixed solution, heating the mixed solution to 35-40 ℃, putting the mixed solution and primary aggregate into a processing container, wherein the mixed solution needs to completely submerge the primary aggregate, and before the primary aggregate is poured into the processing container, the temperature of the surface of the primary aggregate is controlled to be 35-45 ℃;
s5: firstly, pumping out air in a processing container through a vacuum pump to enable the interior of the processing container to be in a negative pressure state, keeping the negative pressure for 10-15 minutes, injecting gas into the processing container through a pressure pump to enable the processing container to be in a high pressure state, keeping the high pressure for 30-60 minutes, controlling the pressure in the processing container to be 0.05-0.15 MPa when the negative pressure is applied, controlling the pressure in the processing container to be 3-6 MPa when the high pressure is applied, slowly releasing the pressure, continuing to soak for 180-300 minutes after the pressure in the processing container is consistent with the outside, controlling the temperature in the processing container to be 35-45 ℃, finally stopping heating for 45-60 minutes, naturally cooling, taking out the aggregate and primarily drying to obtain the high-quality recycled aggregate.
Referring to FIG. 1, example III
The embodiment provides a preparation method of high-quality recycled aggregate, which comprises the following steps:
s1: mixing 100 parts of plant ash, 47 parts of lime powder, 43 parts of quartz powder, 13 parts of sodium silicate, 7 parts of potassium hydroxide, 7 parts of methyl silicic acid and 110 parts of ethanol to prepare a strengthening solution, mixing 13 parts of lime powder, 8 parts of caustic soda, 2 parts of iron tailing powder and 200 parts of water to prepare an auxiliary solution, and preparing the strengthening solution: adding plant ash, lime powder, quartz stone powder, sodium silicate, potassium hydroxide, methyl silicic acid and ethanol into stirring equipment according to a proportion, stirring and mixing, injecting inert gas as protective gas during stirring, controlling the stirring temperature at 40-50 ℃, and quickly mixing for 15-30 minutes by the stirring equipment at a rotating speed of 500-600 r/min, wherein the preparation method of the auxiliary solution comprises the following steps: heating water to 70-80 ℃, then adding iron tailing powder, quickly mixing for 5-15 minutes, then adding lime powder and caustic soda, continuously and quickly mixing for 10-20 minutes, stopping heating, continuously stirring until the temperature is reduced to 55-65 ℃, preparing an auxiliary solution, and pouring the auxiliary solution into a heat preservation box for heat preservation;
s2: pouring the construction waste into crushing equipment for primary crushing, removing materials such as internal reinforcing steel bars and the like through a screening device after crushing is finished, then putting the construction waste without the reinforcing steel bars into the crushing equipment again for crushing until the diameter of crushed particles is controlled to be 10-35 mm to obtain crushed particles, putting the crushed particles into the screening device for secondary screening to remove wood, plastics, glass, paper scraps and metal particles in the crushed particles so as to obtain primary aggregate, screening the metal particles by using an eddy current sorting machine or a magnetic sorting machine when the metal is removed, finally screening the primary aggregate again, and removing particle powder with the particle diameter smaller than 2mm in the primary aggregate;
s3: pouring the auxiliary solution into the primary aggregate, wherein the auxiliary solution is required to completely submerge the primary aggregate and is heated at the same time, the temperature is controlled to be 45-55 ℃, the heating is stopped after the auxiliary solution is soaked for 15-25 minutes, the soaking is continued for 60-90 minutes, finally, the primary aggregate is filtered, the primary aggregate is subjected to sun exposure or device heating and drying in advance, the temperature is kept at 40-65 ℃ when the auxiliary solution is mixed with the primary aggregate, and the primary aggregate is stirred every 5 minutes for 15-30 seconds after the auxiliary solution is poured into the primary aggregate;
s4: mixing the strengthening solution and water according to the proportion of 1:3-5 to obtain a mixed solution, heating the mixed solution to 35-40 ℃, then putting the mixed solution and primary aggregate into a processing container, wherein the mixed solution is required to completely submerge the primary aggregate, and the surface temperature of the primary aggregate is controlled to be 35-45 ℃ before the primary aggregate is poured into the processing container;
s5: firstly, pumping out air in a processing container through a vacuum pump to enable the interior of the processing container to be in a negative pressure state, keeping the negative pressure for 10-15 minutes, injecting gas into the processing container through a pressure pump to enable the processing container to be in a high pressure state, keeping the high pressure for 30-60 minutes, controlling the pressure in the processing container to be 0.05-0.15 MPa when the negative pressure is applied, controlling the pressure in the processing container to be 3-6 MPa when the high pressure is applied, slowly releasing the pressure, continuing to soak for 180-300 minutes after the pressure in the processing container is consistent with the outside, controlling the temperature in the processing container to be 35-45 ℃, finally stopping heating for 45-60 minutes, naturally cooling, taking out the aggregate and primarily drying to obtain the high-quality recycled aggregate.
Referring to FIG. 1, example No. four
The embodiment provides a preparation method of high-quality recycled aggregate, which comprises the following steps:
s1: mixing 100 parts of plant ash, 46 parts of lime powder, 41 parts of quartz powder, 12 parts of sodium silicate, 7 parts of potassium hydroxide, 6 parts of methyl silicic acid and 115 parts of ethanol to prepare a strengthening solution, mixing 11 parts of lime powder, 6 parts of caustic soda, 1 part of iron tailing powder and 200 parts of water to prepare an auxiliary solution, and preparing the strengthening solution: adding plant ash, lime powder, quartz stone powder, sodium silicate, potassium hydroxide, methyl silicic acid and ethanol into a stirring device according to a ratio, stirring and mixing, injecting inert gas as protective gas during stirring, controlling the stirring temperature at 40-50 ℃, and quickly mixing for 15-30 minutes by the stirring device at a rotating speed of 500-600 r/min, wherein the preparation method of the auxiliary solution comprises the following steps: firstly, heating water to 70-80 ℃, then adding iron tailing powder, quickly mixing for 5-15 minutes, then adding lime powder and caustic soda, continuously and quickly mixing for 10-20 minutes, stopping heating, continuously stirring until the temperature is reduced to 55-65 ℃, preparing an auxiliary solution, and pouring the auxiliary solution into a heat preservation box for heat preservation;
s2: pouring the construction waste into crushing equipment for primary crushing, removing materials such as internal reinforcing steel bars through a screening device after crushing is finished, then putting the construction waste without the reinforcing steel bars into the crushing equipment again for crushing until the diameter of crushed particles is controlled to be 10-35 mm to obtain crushed particles, putting the crushed particles into the screening device for secondary screening to remove wood, plastic, glass, paper scraps and metal particles in the crushed particles to obtain primary aggregate, screening the metal particles by using an eddy current sorting machine or a magnetic sorting machine when the metal is removed, and finally screening the primary aggregate again to remove particle powder with the particle diameter smaller than 2mm in the primary aggregate;
s3: pouring an auxiliary solution into the primary aggregate, wherein the auxiliary solution is required to completely submerge the primary aggregate, heating is carried out simultaneously, the temperature is controlled to be 45-55 ℃, the heating is stopped after soaking for 15-25 minutes, the soaking is continued for 60-90 minutes, finally, the primary aggregate is filtered, the primary aggregate is subjected to sun exposure or device heating and drying in advance, the temperature is kept at 40-65 ℃ when the auxiliary solution is mixed with the primary aggregate, and the primary aggregate is stirred for 15-30 seconds every 5 minutes after the auxiliary solution is poured into the primary aggregate;
s4: mixing the strengthening solution with water according to the proportion of 1:3-5 to obtain a mixed solution, heating the mixed solution to 35-40 ℃, putting the mixed solution and primary aggregate into a processing container, wherein the mixed solution needs to completely submerge the primary aggregate, and before the primary aggregate is poured into the processing container, the temperature of the surface of the primary aggregate is controlled to be 35-45 ℃;
s5: firstly, pumping out air in a processing container through a vacuum pump to enable the interior of the processing container to be in a negative pressure state, keeping the negative pressure for 10-15 minutes, injecting gas into the processing container through a pressure pump to enable the processing container to be in a high pressure state, keeping the high pressure for 30-60 minutes, controlling the pressure in the processing container to be 0.05-0.15 MPa when the pressure is negative, controlling the pressure in the processing container to be 3-6 MPa when the pressure is high, slowly releasing the pressure, continuing to soak for 180-300 minutes after the pressure in the processing container is consistent with the external environment, controlling the temperature in the processing container to be 35-45 ℃, finally stopping heating for 45-60 minutes, naturally cooling, taking out aggregates, and primarily drying the aggregates to obtain high-quality recycled aggregates.
Referring to FIG. 1, example V
The embodiment provides a preparation method of high-quality recycled aggregate, which comprises the following steps:
s1: mixing 100 parts of plant ash, 45 parts of lime powder, 40 parts of quartz powder, 11 parts of sodium silicate, 6 parts of potassium hydroxide, 5 parts of methyl silicic acid and 120 parts of ethanol to prepare a strengthening solution, mixing 10 parts of lime powder, 5 parts of caustic soda, 1 part of iron tailing powder and 200 parts of water to prepare an auxiliary solution, and preparing the strengthening solution: adding plant ash, lime powder, quartz stone powder, sodium silicate, potassium hydroxide, methyl silicic acid and ethanol into stirring equipment according to a proportion, stirring and mixing, injecting inert gas as protective gas during stirring, controlling the stirring temperature at 40-50 ℃, and quickly mixing for 15-30 minutes by the stirring equipment at a rotating speed of 500-600 r/min, wherein the preparation method of the auxiliary solution comprises the following steps: firstly, heating water to 70-80 ℃, then adding iron tailing powder, quickly mixing for 5-15 minutes, then adding lime powder and caustic soda, continuously and quickly mixing for 10-20 minutes, stopping heating, continuously stirring until the temperature is reduced to 55-65 ℃, preparing an auxiliary solution, and pouring the auxiliary solution into a heat preservation box for heat preservation;
s2: pouring the construction waste into crushing equipment for primary crushing, removing materials such as internal reinforcing steel bars through a screening device after crushing is finished, then putting the construction waste without the reinforcing steel bars into the crushing equipment again for crushing until the diameter of crushed particles is controlled to be 10-35 mm to obtain crushed particles, putting the crushed particles into the screening device for secondary screening to remove wood, plastic, glass, paper scraps and metal particles in the crushed particles to obtain primary aggregate, screening the metal particles by using an eddy current sorting machine or a magnetic sorting machine when the metal is removed, and finally screening the primary aggregate again to remove particle powder with the particle diameter smaller than 2mm in the primary aggregate;
s3: pouring an auxiliary solution into the primary aggregate, wherein the auxiliary solution is required to completely submerge the primary aggregate, heating is carried out simultaneously, the temperature is controlled to be 45-55 ℃, the heating is stopped after soaking for 15-25 minutes, the soaking is continued for 60-90 minutes, finally, the primary aggregate is filtered, the primary aggregate is subjected to sun exposure or device heating and drying in advance, the temperature is kept at 40-65 ℃ when the auxiliary solution is mixed with the primary aggregate, and the primary aggregate is stirred for 15-30 seconds every 5 minutes after the auxiliary solution is poured into the primary aggregate;
s4: mixing the strengthening solution with water according to the proportion of 1:3-5 to obtain a mixed solution, heating the mixed solution to 35-40 ℃, putting the mixed solution and primary aggregate into a processing container, wherein the mixed solution needs to completely submerge the primary aggregate, and before the primary aggregate is poured into the processing container, the temperature of the surface of the primary aggregate is controlled to be 35-45 ℃;
s5: firstly, pumping out air in a processing container through a vacuum pump to enable the interior of the processing container to be in a negative pressure state, keeping the negative pressure for 10-15 minutes, injecting gas into the processing container through a pressure pump to enable the processing container to be in a high pressure state, keeping the high pressure for 30-60 minutes, controlling the pressure in the processing container to be 0.05-0.15 MPa when the negative pressure is applied, controlling the pressure in the processing container to be 3-6 MPa when the high pressure is applied, slowly releasing the pressure, continuing to soak for 180-300 minutes after the pressure in the processing container is consistent with the outside, controlling the temperature in the processing container to be 35-45 ℃, finally stopping heating for 45-60 minutes, naturally cooling, taking out the aggregate and primarily drying to obtain the high-quality recycled aggregate.
Comparing the conventional recycled aggregate with the recycled aggregates prepared in examples one to five, the recycled aggregates prepared in examples one to five are as follows:
as can be seen from the above table, the recycled aggregate obtained by the present invention has significantly improved water absorption and crush index, and one of the best examples was carried out.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (8)
1. The preparation method of the high-quality recycled aggregate is characterized by comprising the following steps:
s1: mixing 100 parts of plant ash, 45-50 parts of lime powder, 40-45 parts of quartz powder, 11-15 parts of sodium silicate, 6-10 parts of potassium hydroxide, 5-9 parts of methyl silicic acid and 100-120 parts of ethanol to prepare a strengthening solution, mixing 10-15 parts of lime powder, 5-10 parts of caustic soda, 1-2 parts of iron tailing powder and 200 parts of water to prepare an auxiliary solution, wherein the preparation method of the strengthening solution comprises the following steps: adding plant ash, lime powder, quartz stone powder, sodium silicate, potassium hydroxide, methyl silicic acid and ethanol into stirring equipment according to a proportion, stirring and mixing, injecting inert gas as protective gas during stirring, controlling the stirring temperature at 40-50 ℃, and quickly mixing for 15-30 minutes by the stirring equipment at a rotating speed of 500-600 r/min, wherein the preparation method of the auxiliary solution comprises the following steps: firstly, heating water to 70-80 ℃, then adding iron tailing powder, quickly mixing for 5-15 minutes, then adding lime powder and caustic soda, continuously and quickly mixing for 10-20 minutes, stopping heating, continuously stirring until the temperature is reduced to 55-65 ℃, preparing an auxiliary solution, and pouring the auxiliary solution into a heat preservation box for heat preservation;
s2: pouring the construction waste into crushing equipment for primary crushing, removing internal reinforcing steel bar materials through a screening device after crushing is finished, then putting the construction waste without reinforcing steel bars into the crushing equipment again for crushing until the diameter of crushed particles is controlled to be 10-35 mm to obtain crushed particles, putting the crushed particles into the screening device for secondary screening, and removing wood, plastic, glass, paper scraps and metal particles in the crushed particles to obtain primary aggregate;
s3: pouring the auxiliary solution into the primary aggregate, wherein the auxiliary solution is required to completely submerge the primary aggregate, heating the primary aggregate at the same time, controlling the temperature to be 45-55 ℃, soaking the primary aggregate for 15-25 minutes, stopping heating, continuing to soak the primary aggregate for 60-90 minutes, and finally filtering the primary aggregate;
s4: mixing the strengthening solution and water according to the proportion of 1:3-5 to obtain a mixed solution, heating the mixed solution to 35-40 ℃, and then putting the mixed solution and the preliminary aggregate into a processing container, wherein the mixed solution is required to completely submerge the preliminary aggregate;
s5: firstly, pumping out air in a processing container through a vacuum pump to enable the interior of the processing container to be in a negative pressure state, keeping the negative pressure for 10-15 minutes, injecting gas into the processing container through a pressure pump to enable the processing container to be in a high pressure state, keeping the high pressure for 30-60 minutes, slowly releasing the pressure, continuing to soak for 180-300 minutes after the pressure in the processing container is consistent with the outside, taking out the primary aggregate, and drying to obtain the high-quality recycled aggregate.
2. The method for preparing high-quality recycled aggregate according to claim 1, wherein in the step S2, when removing the metal, the metal particles are screened out by crushing the particles by using an eddy current separator or a magnetic separator.
3. The method for preparing high-quality recycled aggregate according to claim 1, wherein in S2, the preliminary aggregate is screened again to remove granular powder with a particle diameter of less than 2 mm.
4. The method for preparing high-quality recycled aggregate according to claim 1, wherein in S3, the preliminary aggregate is dried by sun exposure or device heating in advance, and the temperature of the auxiliary solution is maintained at 40-65 ℃ when the auxiliary solution is mixed with the preliminary aggregate.
5. The method for preparing a high-quality recycled aggregate according to claim 1, wherein the preliminary aggregate is stirred for 15 to 30 seconds every 5 minutes after the auxiliary solution is poured into the preliminary aggregate in S3.
6. The method for preparing high-quality recycled aggregate according to claim 1, wherein the temperature of the surface of the primary aggregate is controlled to be 35 to 45 ℃ before the primary aggregate is poured into the processing container in S4.
7. The method for producing a high-quality recycled aggregate according to claim 1, wherein in S5, the pressure inside the processing vessel is controlled to be 0.05MPa to 0.15MPa at a negative pressure, and the pressure inside the processing vessel is controlled to be 3MPa to 6MPa at a high pressure.
8. The method for preparing high-quality recycled aggregate according to claim 1, wherein in S5, the temperature inside the processing container is controlled to be 35-45 ℃, heating is stopped for the last 45-60 minutes, and the recycled aggregate is naturally cooled.
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| CN106477929A (en) * | 2016-09-20 | 2017-03-08 | 上海市建筑科学研究院 | A kind of intensifying regenerating aggregate processing method and intensifying regenerating aggregate concrete |
| CN108341616A (en) * | 2018-03-03 | 2018-07-31 | 黄旭东 | A kind of preparation method of high strength moistureproof recycled aggregate |
| CN113563001A (en) * | 2021-04-28 | 2021-10-29 | 东南大学 | Method for preparing recycled aggregate by using iron tailing fine sand |
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| JP2012215384A (en) * | 2011-03-31 | 2012-11-08 | Sumitomo Osaka Cement Co Ltd | Pretreatment method in performing evaluation test for regenerated aggregate and testing method for regenerated aggregate |
| CN110194618B (en) * | 2019-06-17 | 2021-09-14 | 佛冈锦华混凝土有限公司 | Construction waste recycled concrete and preparation method thereof |
| CN110357472B (en) * | 2019-08-13 | 2022-01-11 | 广东新瑞龙生态建材有限公司 | Process for preparing recycled coarse aggregate from construction waste |
| CN110563368A (en) * | 2019-10-18 | 2019-12-13 | 重庆交能建材有限责任公司 | concrete recycled aggregate and preparation process thereof |
| CN112266267A (en) * | 2020-10-19 | 2021-01-26 | 深圳市为海建材有限公司 | Light recycled aggregate pervious concrete and preparation method thereof |
| CN112811866A (en) * | 2021-01-15 | 2021-05-18 | 深圳市宝金华混凝土有限公司 | Recycled aggregate concrete and preparation method thereof |
| CN113087427A (en) * | 2021-03-12 | 2021-07-09 | 中国地质大学（武汉） | Recycled aggregate soaked based on metakaolin slurry and modification method thereof |
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| CN106477929A (en) * | 2016-09-20 | 2017-03-08 | 上海市建筑科学研究院 | A kind of intensifying regenerating aggregate processing method and intensifying regenerating aggregate concrete |
| CN108341616A (en) * | 2018-03-03 | 2018-07-31 | 黄旭东 | A kind of preparation method of high strength moistureproof recycled aggregate |
| CN113563001A (en) * | 2021-04-28 | 2021-10-29 | 东南大学 | Method for preparing recycled aggregate by using iron tailing fine sand |
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Inventor after: Ye Xiaoqing Inventor after: Zheng Dongming Inventor after: Liu Xinzhong Inventor after: Ye Yongbin Inventor after: Zheng Minfeng Inventor before: Ye Xiaoqing Inventor before: Zheng Dongming Inventor before: Liu Xinzhong Inventor before: Ye Yongbin Inventor before: Zheng Minfeng |