CN113912314A - Preparation method of high-quality recycled aggregate - Google Patents
Preparation method of high-quality recycled aggregate Download PDFInfo
- Publication number
- CN113912314A CN113912314A CN202111196301.2A CN202111196301A CN113912314A CN 113912314 A CN113912314 A CN 113912314A CN 202111196301 A CN202111196301 A CN 202111196301A CN 113912314 A CN113912314 A CN 113912314A
- Authority
- CN
- China
- Prior art keywords
- aggregate
- parts
- minutes
- processing container
- solution
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Classifications
-
- 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
-
- 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
-
- 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
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 a large amount of construction waste is provided at present 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 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 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 classifier or a magnetic classifier.
Preferably, in S2, the preliminary aggregate is screened again to remove the granular powder with a particle diameter smaller than 2 mm.
Preferably, 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 ℃ to 65 ℃ when the auxiliary solution is mixed with the preliminary aggregate.
Preferably, after the auxiliary solution is poured into the preliminary aggregate in S3, the preliminary aggregate is stirred for 15 seconds to 30 seconds every 5 minutes.
Preferably, 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 in S4.
Preferably, in S5, the pressure inside the processing container is controlled to be 0.05MPa to 0.15MPa at negative pressure and 3MPa to 6MPa at high pressure.
Preferably, in S5, the temperature inside the processing container is controlled to 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.
Drawings
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 and 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, completely submerging the primary aggregate by the mixed solution, and controlling the temperature of the surface of the primary aggregate 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 II
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 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 and 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, completely submerging the primary aggregate by the mixed solution, and controlling the temperature of the surface of the primary aggregate 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 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: 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 and 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, completely submerging the primary aggregate by the mixed solution, and controlling the temperature of the surface of the primary aggregate 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 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 and 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, completely submerging the primary aggregate by the mixed solution, and controlling the temperature of the surface of the primary aggregate 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 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 and 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, completely submerging the primary aggregate by the mixed solution, and controlling the temperature of the surface of the primary aggregate 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.
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 (10)
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, 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 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 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.
2. The method for preparing a high-quality recycled aggregate according to claim 1, wherein in S1, the method for preparing 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 at the rotating speed of 500-600 r/min by the stirring equipment.
3. The method for preparing a high-quality recycled aggregate according to claim 1, wherein in S1, 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.
4. The method of claim 1, wherein in the step of removing the metal in the step S2, the metal particles are screened out by crushing the particles using an eddy current classifier or a magnetic classifier.
5. The method of claim 1, wherein in step S2, the preliminary aggregate is screened again to remove the granular powder with a particle diameter less than 2 mm.
6. The method for preparing high-quality recycled aggregate according to claim 1, wherein the preliminary aggregate is dried in advance by sun exposure or by heating with a device in S3, and the temperature of the auxiliary solution is maintained at 40-65 ℃ when the auxiliary solution is mixed with the preliminary aggregate.
7. The method of 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 at S3.
8. The method of 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.
9. The method of claim 1, wherein in S5, the pressure inside the processing container is controlled to be 0.05MPa to 0.15MPa at negative pressure, and the pressure inside the processing container is controlled to be 3MPa to 6MPa at high pressure.
10. The method for preparing a high-quality recycled aggregate according to claim 1, wherein the temperature inside the processing vessel is controlled to 35 to 45 ℃ in S5, and the heating is stopped and the material is naturally cooled after the last 45 to 60 minutes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111196301.2A CN113912314B (en) | 2021-10-14 | 2021-10-14 | Preparation method of high-quality recycled aggregate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111196301.2A CN113912314B (en) | 2021-10-14 | 2021-10-14 | Preparation method of high-quality recycled aggregate |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113912314A true CN113912314A (en) | 2022-01-11 |
| CN113912314B CN113912314B (en) | 2022-10-25 |
Family
ID=79240267
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111196301.2A Active CN113912314B (en) | 2021-10-14 | 2021-10-14 | Preparation method of high-quality recycled aggregate |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113912314B (en) |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| 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 |
| CN110194618A (en) * | 2019-06-17 | 2019-09-03 | 佛冈锦华混凝土有限公司 | A kind of construction refuse regenerated concrete and preparation method thereof |
| CN110357472A (en) * | 2019-08-13 | 2019-10-22 | 广东新瑞龙生态建材有限公司 | A kind of technique that building waste prepares regenerated coarse aggregate |
| 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 |
| CN113563001A (en) * | 2021-04-28 | 2021-10-29 | 东南大学 | Method for preparing recycled aggregate by using iron tailing fine sand |
-
2021
- 2021-10-14 CN CN202111196301.2A patent/CN113912314B/en active Active
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| 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 |
| CN110194618A (en) * | 2019-06-17 | 2019-09-03 | 佛冈锦华混凝土有限公司 | A kind of construction refuse regenerated concrete and preparation method thereof |
| CN110357472A (en) * | 2019-08-13 | 2019-10-22 | 广东新瑞龙生态建材有限公司 | A kind of technique that building waste prepares regenerated coarse aggregate |
| 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 |
| CN113563001A (en) * | 2021-04-28 | 2021-10-29 | 东南大学 | Method for preparing recycled aggregate by using iron tailing fine sand |
Non-Patent Citations (9)
| Title |
|---|
| TANTA, A，ET AL.: "The effects of surface treatment methods on properties of recycled concrete aggregates", 《MATERIALS TODAY-PROCEEDINGS》 * |
| 日）后藤稠: "《工业中毒便览（增补版）》", 28 February 1983, 人民卫生出版社 * |
| 朱从香1等: "再生混凝土粗骨料强化试验研究", 《自主创新与持续增长第十一届中国科协年会》 * |
| 林志伟: "基于综合利用建筑垃圾再生骨料混凝土的研究", 《中国优秀博硕士学位论文全文数据库(硕士)工程科技Ⅱ辑》 * |
| 熊枫: "建筑垃圾再生粗骨料改性与再生混凝土性能的研究", 《中国优秀博硕士学位论文全文数据库(硕士)工程科技Ⅱ辑》 * |
| 王春福等: "建筑垃圾再生骨料强化改性研究进展", 《硅酸盐通报》 * |
| 白超: "再生骨料强化对再生骨料及再生混凝土性能的影响研究", 《中国优秀博硕士学位论文全文数据库(硕士)工程科技Ⅰ辑》 * |
| 钮依然等: "砖骨料含量对再生轻骨料混凝土耐久性能影响", 《低温建筑技术》 * |
| 隋玉武等: "化学溶液浸渍法修复废弃混凝土骨料研究", 《山东建筑大学学报》 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN113912314B (en) | 2022-10-25 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108723286B (en) | A kind of regeneration method of the inorganic overlay film hygrometric state antiquated sand of silicates | |
| CN110981228B (en) | High-calcium active lime | |
| EP2784039A1 (en) | Cement curing formulation and method for high-level radioactive boron waste resins from nuclear reactor | |
| CN112209676B (en) | Anti-freezing and anti-efflorescence red mud baking-free brick and preparation method thereof | |
| WO2023216807A1 (en) | Method for preparing ecological foamed ceramic from lepidolite tail mud full waste | |
| CN112851208B (en) | Solid waste based inorganic artificial stone and preparation method thereof | |
| CN113912314B (en) | Preparation method of high-quality recycled aggregate | |
| WO2016045492A1 (en) | Novel geological cement material for solidification of radioactive incineration ash and solification method therefor | |
| CN116283139B (en) | Autoclaved aerated concrete waste carbonization recycling method | |
| CN109052967B (en) | Method for preparing microcrystalline glass by using potassium feldspar tailings | |
| CN109809754A (en) | Air-entrained concrete building block and preparation method thereof | |
| CN111620561A (en) | Method for preparing radioactive nuclear waste glass solidified body by microwave method | |
| CN116462437A (en) | Modified recycled aggregate and preparation method and application thereof | |
| CN115304356A (en) | High-strength construction waste recycled brick and preparation method thereof | |
| CN115849824A (en) | Carbon fixation of electric furnace nickel slag carbon and high-value utilization method thereof in concrete | |
| CN113336460B (en) | Functional aggregate for radiation-proof concrete and preparation method thereof | |
| CN112047654B (en) | Method for reinforcing recycled fine aggregate by using bacillus pasteurii DSM33 | |
| CN112390581B (en) | Environment-friendly concrete and preparation method thereof | |
| CN114804806A (en) | Production process for preparing recycled building material from building waste | |
| CN114853414A (en) | Method for preparing autoclaved aerated concrete block by taking blast furnace slag-gold tailings as raw material | |
| CN108793866B (en) | Ferronickel slag building material and preparation method thereof | |
| CN113603422A (en) | Anti-cracking recycled concrete | |
| CN108609923B (en) | Method for preparing environment-friendly water permeable brick from construction waste reclaimed materials | |
| CN102222532B (en) | Method for solidifying radioactive waste resin by utilizing mixture of silicate and sulphate aluminium cement | |
| CN113277817A (en) | Tailing slag-doped high-strength wear-resistant concrete and preparation method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CB03 | Change of inventor or designer information | ||
| CB03 | Change of inventor or designer information |
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 |