CN102503197A - Cement concrete recycling method - Google Patents
Cement concrete recycling method Download PDFInfo
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- CN102503197A CN102503197A CN201110316993XA CN201110316993A CN102503197A CN 102503197 A CN102503197 A CN 102503197A CN 201110316993X A CN201110316993X A CN 201110316993XA CN 201110316993 A CN201110316993 A CN 201110316993A CN 102503197 A CN102503197 A CN 102503197A
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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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/10—Production of cement, e.g. improving or optimising the production methods; Cement grinding
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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
A cement concrete recycling method is disclosed, which comprises three parts of stripping aggregates and slurries in waste concrete, regenerating the aggregates and regenerating the slurries. A microwave heat treatment method is adopted for stripping the aggregates and slurries in the waste concrete, and mainly comprises the following steps: utilizing the difference between the microwave absorbing capability of the slurries and the microwave absorbing capability of the aggregates, putting the waste concrete into a sealed device provided with a microwave generator, subjecting the waste concrete to microwave irradiation so as to increase the temperature until the concrete is made brittle by irradiation, rotating the brittle concrete in a cylinder with a gridding lining, and utilizing the mutual collision to thoroughly strip the slurries and the aggregates. The aggregate regeneration comprises the following steps: for the aggregates stripped from the concrete, screening the residual part after a powder concentrator collects a part of the dehydrated phase powders of cement slurries, and preparing into regenerated aggregates of different sizes. The slurry regeneration comprises the following steps: according to different chemical compositions of the dehydrated phases of the cement slurries, blending and correcting raw materials specifically, enabling the rate of the raw material to meet the requirements of silicate cement raw material, and then adopting a traditional kiln or microwave to sinter and prepare silicate cement.
Description
Technical field
The present invention relates to a kind of cement concrete circulation regeneration method, comprise the slurry that gathers materials in the discarded concrete peel off, gather materials regeneration and slurry three parts of regenerating, present method is adapted to the concrete cyclic regeneration of different grades.
Background technology
Cement concrete is the maximum material of present consumption owing to shape cheap, high-strength and that be made into to require easily becomes; But in recent years because the huge carbon emission of cement (every production and use 1 ton of cement to discharge 0.6～1 ton of carbonic acid gas approximately); Resource consumption and energy consumption are high, are difficult for regenerated using and enjoy and denounce.But as the foundation stone of modern architecture industry, cement concrete will be widely used as irreplaceable material of construction in for a long time from now on.Therefore how really the concrete cyclic regeneration of realization is one of huge technological challenge of facing of present cement concrete material.
(Recycled Aggregate Concrete, research RAC) has become global focus to the regenerated aggregate concrete at present.The method of regeneration aggregate mainly is divided into two types: one type is directly that discarded concrete is broken; Aggregate as roadbed filling, sub-surface aggregate or middle weak concrete; Research shows that the obviously increase of water requirement, intensity and the modulus that adopt this aggregate concrete decrease; Also have the investigator to utilize this regeneration aggregate to prepare high-strength high-performance concrete, a large amount of research shows that this gathering materials still can not reach the performance of primary aggregate concrete; Other one type is to adopt the hyperthermic treatment discarded concrete; Make that mortar and coarse aggregate are peeled off in the concrete; Coarse aggregate is recycled; Visible intensification stripping means comprises several different methods such as 350 ℃ of calcinings, 500～550 ℃ of calcinings, 600～620 ℃ of calcinings and thermal fatigue in the document, and is wherein more common with temperature calcining overburden ratio more than 550 ℃.There are some researches show and adopt the recovery aggregate of this stripping means preparation that concrete is also had disadvantageous effect think it to be because intensification makes aggregate thermal stress occur or makes aggregate partly decompose.In general: the comprehensive utilization of the only a few discarded concrete that this type technology just realizes, this regeneration also will produce a large amount of discarded concretes, and concrete cyclic regeneration is far from being.
The invention provides a kind of method of cement concrete cyclic regeneration.Wherein gather materials with slurry what peel off employing is the method for microwave calcination; The maximum characteristics of microwave are whole intensifications; Because microwave has very strong penetrance, concrete integral body is heated, thereby can improve the size minimizing comminution energy conssumption that concrete gets into kiln; The suction ripple that is utilized in differing materials under the radiation of microwave is different with the intensification performance and temperature that reach is different; Realize differential intensification; Heat up than comparatively fast owing to often containing the strong materials of wave-sucking performance such as certain moisture and a large amount of aluminum oxide, red stone in the cement slurry in the concrete; The oxide compound of the calcium in gathering materials, silicon etc. then wave absorbtion is poor and heat up slow; Thereby the differential intensification that realizes; Make the slurry owing to heat up than comparatively fast losing gelling gradually, and gather materials owing to heat up and kept the stability of self chemistry and mechanical property slowly and can not influence the technical feature that its conduct is gathered materials, in addition owing to both temperature difference has promoted slurry and peeling off of gathering materials.Volume(tric)fraction is about 75% in concrete owing to gather materials, because the intensification amplitude of gathering materials is little, it is also corresponding low significantly to peel off the required energy consumption of concrete, is a kind of regeneration that has more application prospect.
The present invention proposes a kind of new regeneration techniques that gathers materials, cylindrical shell or vibratory screening apparatus through a kind of rotation utilize discarded concrete, the mutual collision between gathering materials; Slurry is peeled off with gathering materials gradually in the concrete that makes the process microwave treatment and lost efficacy; Gather materials by the regeneration aggregate of preparation standardization behind the gradation sizing,, can not cause thermal stress and decomposition because of temperature rise because aggregate did not receive excessively high temperature; Its technical feature and general aggregate are as good as, and particle shape can be more reasonable.
Cement slurry after this circulation regeneration method will be peeled off mix join correction material through the calcining process cement, can fully alleviate manufacture of cement consuming excessively to resource.Present method has really realized the continuous utilization of Nonrenewable resources in the cement concrete, does not appear in the newspapers in this mode document at home and abroad.
Summary of the invention
The object of the invention aims to provide a kind of cement concrete circulation regeneration method.
A kind of cement concrete circulation regeneration method of the present invention; Comprise the slurry that gathers materials in the discarded concrete peel off, gather materials regeneration and slurry three parts of regenerating; Gather materials in the described discarded concrete and slurry is peeled off; Adopt the microwave heat-treating methods, utilize slurry and gather materials, the discarded concrete input is had accept microwave radiation in the Sealing Arrangement of microwave generator and heat up until concrete by the radiation shortcakeization to the difference of microwave wave-sucking performance; The concrete of shortcakeization is rotated in the cylindrical shell of latticed liner is arranged, utilize its mutual collision that slurry is thoroughly peeled off with gathering materials; The described regeneration of gathering materials is to gather materials what concrete separated, and the remainder after powder separating machine is collected a part of cement slurry dehydration phase powder is processed the regenerated aggregate of size fractionated through gradation sizing; The regeneration of described slurry is according to the difference of cement slurry dehydration phase chemistry composition, mixes targetedly and joins the rectification raw material, makes its rate value reach the requirement of silicate cement raw material, adopts traditional kiln or microwave to carry out sintering subsequently and prepares silicate cement.
In the method for the present invention, discarded concrete gathers materials and handles the technology peel off with the slurry microwave thermal and be, and is earlier that discarded concrete is just broken to being not more than 500mm, reclaims wherein reinforcing bar and other metals; First broken discarded concrete input is had accept microwave radiation in the Sealing Arrangement of microwave generator and heat up; Make slurry temperature under microwave irradiation effect be elevated to 550～1000 ℃ fast, thereby lose gelling, and gather materials since the relatively poor temperature of wave-sucking performance still at 100～450 ℃; Reduce the temperature inside stress that gathers materials to greatest extent; Keep the intact of aggregate, this moment aggregate and the direct cohesive force of slurry very a little less than, concrete bulk strength is not higher than 1.5MPa.
In the method for the present invention; The regeneration system body characteristics that gathers materials is: the concrete of shortcakeization is rotated in the cylindrical shell of latticed liner is arranged; Utilize its mutual collision that slurry is thoroughly peeled off with gathering materials, collect a part of powder (cement slurry dehydration phase) at the cylindrical shell powder separating machine; With selecting remainder behind the powder through vibratory screening apparatus, carry out classification to gathering materials, process the regenerated aggregate of size fractionated; Powder (the following particle of 0.075mm) part is then collected as cement slurry dehydration phase through powder separating machine.
In the method for the present invention, in the regeneration of described slurry, it is one or more of calcareous, sal, aluminium value, ferriferous raw material that specific aim is mixed the rectification raw material of joining.
The regeneration of cement slurry dehydration phase; It is characterized in that difference according to its chemical ingredients; One or more that insert calcareous, sal, aluminium value, ferriferous raw material are targetedly corrected; Make its rate value reach the requirement of silicate cement raw material, adopt traditional kiln or microwave to carry out sintering subsequently, the preparation silicate cement.Adopt silicate cement dehydration phase composition very approximate with cement slurry usually, only need a small amount of rectification raw material to get final product.Different with conventional cement slurry production cement, adopt dehydration to produce cement mutually and need not decompose Wingdale, therefore can reduce because the CO that carbonate decomposition is discharged
2(about 0.59 ton of cement clinker per ton), the energy consumption of manufacture of cement also can reduce significantly.
Description of drawings
Fig. 1 is a microwave method concrete cyclic regeneration synoptic diagram of the present invention
Embodiment
A kind of cement concrete circulation regeneration method flow process of the present invention is as shown in Figure 1, and its steps in sequence is:
1, with the broken muscle that removes of discarded concrete, size is not more than 500mm and gets final product;
2, the discarded concrete that fragmentation is removed behind the muscle is put into the microwave oven radiant temperature, makes the concrete bulk strength not be higher than 0.5MPa and get final product, gather materials this moment and slurry between cohesive force and the gelling of slurry lose basically;
3, the concrete after the shortcakeization is put into the cylindrical shell internal rotation of grid liner and selected powder, get into vibratory screening apparatus classification gumming subsequently, form and reclaim aggregate;
4, powder is carried out chemical analysis, and its composition is corrected, adopt conventional kiln or microwave oven to carry out sintering and prepare cement clinker.
Embodiment 1
Present method can be implemented in the laboratory: its method is to adopt 100mm * 100mm * 100mm concrete, and concrete coarse aggregate is a Wingdale matter rubble, and fine aggregate is a Wingdale matter mechanism sand; Test specimen is directly put into the microwave oven of 4kw, and through after the microwave radiation, the temperature of slurry part reaches about 750 ℃; The coarse aggregate surface temperature is 482 ℃; Internal temperature is 96 ℃, slurry and gather materials between do not have cohesive strength basically, the gelling of slurry also is close to disappearance.The intensity that records concrete test block is 0.46MPa, can easy to doly peel off, and only needs on the sieve that gathers materials through repeatedly jolting with slightly firmly crushing is promptly separable.Gathering materials can become regeneration aggregate through sorting.Remaining cement slurry dehydration phase composition and portland cement raw material are more approaching; Just wherein calcium oxide content is slightly high; Add a small amount of clay and iron powder and correct, be calcined to about 1450 ℃ and can obtain Portland clinker, add gypsum and can obtain cement through grinding.Then these recovery gather materials with recycled cement can process concrete, realized the cyclic regeneration of cement concrete.
Embodiment 2
Get the discarded concrete that remove in certain construction site, adopt metal locator to test that wherein no-reinforcing-bar is residual, put into the microwave oven of 4kw; Through after the microwave radiation, the temperature of slurry part reaches about 850 ℃, and test coarse aggregate surface temperature is 532 ℃; Internal temperature is 187 ℃, slurry and gather materials between do not have cohesive strength basically, the gelling of slurry also is close to disappearance; Can easy to doly peel off, only need on the sieve that gathers materials through repeatedly jolting with slightly firmly crushing is promptly separable.Gathering materials can become regeneration aggregate through sorting.Remaining cement slurry dehydration phase composition and portland cement raw material are more approaching; Just wherein silica content is slightly high, and quicklime is lower slightly, adds little limestone and iron powder and corrects; Be calcined to about 1450 ℃ and can obtain Portland clinker, add gypsum and can obtain cement through grinding.Then these recovery gather materials with recycled cement can process concrete, realized the cyclic regeneration of cement concrete.
Embodiment 3
Get the discarded concrete that remove in certain construction site, adopt metal locator to test that wherein no-reinforcing-bar is residual, put into the microwave oven of 4kw; Through after the microwave radiation, the temperature of slurry part can reach about 980 ℃, and test coarse aggregate surface temperature is 604 ℃; Internal temperature is 246 ℃, slurry and gather materials between do not have cohesive strength basically, the gelling of slurry also is close to disappearance; Can easy to doly peel off, only need on the sieve that gathers materials through repeatedly jolting with slightly firmly crushing is promptly separable.Gathering materials can become regeneration aggregate through sorting.Remaining cement slurry dehydration phase composition and portland cement raw material are more approaching; Silicon oxide wherein just; Slightly high with alumina content, quicklime is lower slightly, adds little limestone and iron powder and corrects; Adopt microwave oven to be calcined to about 1400 ℃ and can obtain Portland clinker, add gypsum and can obtain cement through grinding.Then these recovery gather materials with recycled cement can process concrete, realized the cyclic regeneration of cement concrete.
Claims (4)
1. cement concrete circulation regeneration method; It is characterized in that: this method comprises the slurry that gathers materials in the discarded concrete peel off, gather materials regeneration and slurry three parts of regenerating; Gather materials in the described discarded concrete and slurry is peeled off; Adopt the microwave heat-treating methods, utilize slurry and gather materials, the discarded concrete input is had accept microwave radiation in the Sealing Arrangement of microwave generator and heat up until concrete by the radiation shortcakeization to the difference of microwave wave-sucking performance; The concrete of shortcakeization is rotated in the cylindrical shell of latticed liner is arranged, utilize its mutual collision that slurry is thoroughly peeled off with gathering materials; The described regeneration of gathering materials is to gather materials what concrete separated, and the remainder after powder separating machine is collected a part of cement slurry dehydration phase powder is processed the regenerated aggregate of size fractionated through gradation sizing; The regeneration of described slurry is according to the difference of cement slurry dehydration phase chemistry composition, mixes targetedly and joins the rectification raw material, makes its rate value reach the requirement of silicate cement raw material, adopts traditional kiln or microwave to carry out sintering subsequently and prepares silicate cement.
2. cement concrete circulation regeneration method as claimed in claim 1 is characterized in that: discarded concrete gathers materials and handles the technology peel off with the slurry microwave thermal and be, and is earlier that discarded concrete is just broken to being not more than 500mm, reclaims wherein reinforcing bar and other metals; First broken discarded concrete input is had accept microwave radiation in the Sealing Arrangement of microwave generator and heat up; Make slurry temperature under microwave irradiation effect be elevated to 550～1000 ℃ fast; Thereby lose gelling, and gather materials because the relatively poor temperature of wave-sucking performance, keeps the intact of aggregate still at 100～450 ℃; This moment aggregate and the direct cohesive force of slurry very a little less than, concrete bulk strength is not higher than 1.5MPa.
3. cement concrete circulation regeneration method as claimed in claim 1; It is characterized in that: the described regeneration of gathering materials; Adopting a kind ofly has the rotation middle cylinder body of grid liner that the concrete of shortcakeization is peeled off; Described gradation sizing is through vibratory screening apparatus classification screening, the following particulate fraction of 0.075mm after that described cement slurry dehydration is selected for the powder separating machine mutually or classification.
4. cement concrete circulation regeneration method as claimed in claim 1; It is characterized in that: in the regeneration of described slurry, mixing the rectification raw material of joining to the cement slurry chemical ingredients is to process cement slurry behind one or more of calcareous, sal, aluminium value, ferriferous raw material.
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| CN201110316993XA CN102503197A (en) | 2011-10-19 | 2011-10-19 | Cement concrete recycling method |
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| CN201110316993XA CN102503197A (en) | 2011-10-19 | 2011-10-19 | Cement concrete recycling method |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103787632A (en) * | 2014-01-20 | 2014-05-14 | 北京奥润开元环保科技研究院有限公司 | Method for inspecting colloidal mortar strength of cementing material taking building rubbish as main aggregate |
| CN104496284A (en) * | 2014-11-19 | 2015-04-08 | 武汉工程大学 | Waste asphalt concrete gradating optimization method based on grey system theory |
| CN106587688A (en) * | 2016-11-18 | 2017-04-26 | 周兵 | Regeneration material based on concrete discarded slurry and preparing method and application thereof |
| CN107162453A (en) * | 2017-07-13 | 2017-09-15 | 王家齐 | The lossless generating apparatus again of waste and old concrete aggregate |
| CN110665617A (en) * | 2019-11-07 | 2020-01-10 | 西安建筑科技大学 | Microwave-assisted coarse aggregate recovery production line equipment and method thereof |
| CN111847949A (en) * | 2020-07-29 | 2020-10-30 | 襄阳市政建设集团有限公司 | Classification method for waste concrete block treatment |
| CN112573851A (en) * | 2020-12-27 | 2021-03-30 | 中南大学 | Method for recovering sandstone aggregate from waste concrete |
| CN113135674A (en) * | 2021-05-06 | 2021-07-20 | 浙江永坚新材料科技股份有限公司 | Utilize integrated device of abandonment premixed concrete preparation regeneration cement paste powder |
| CN115254889A (en) * | 2022-06-21 | 2022-11-01 | 武汉建工集团股份有限公司 | Box-type waste concrete recycling, crushing and processing integrated production line and method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103787632A (en) * | 2014-01-20 | 2014-05-14 | 北京奥润开元环保科技研究院有限公司 | Method for inspecting colloidal mortar strength of cementing material taking building rubbish as main aggregate |
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| CN107162453A (en) * | 2017-07-13 | 2017-09-15 | 王家齐 | The lossless generating apparatus again of waste and old concrete aggregate |
| CN110665617A (en) * | 2019-11-07 | 2020-01-10 | 西安建筑科技大学 | Microwave-assisted coarse aggregate recovery production line equipment and method thereof |
| CN111847949A (en) * | 2020-07-29 | 2020-10-30 | 襄阳市政建设集团有限公司 | Classification method for waste concrete block treatment |
| CN112573851A (en) * | 2020-12-27 | 2021-03-30 | 中南大学 | Method for recovering sandstone aggregate from waste concrete |
| CN113135674A (en) * | 2021-05-06 | 2021-07-20 | 浙江永坚新材料科技股份有限公司 | Utilize integrated device of abandonment premixed concrete preparation regeneration cement paste powder |
| CN113135674B (en) * | 2021-05-06 | 2024-02-09 | 浙江永坚新材料科技股份有限公司 | Utilize integrated device of abandonment ready-mixed concrete preparation regeneration cement thick liquid powder |
| CN115254889A (en) * | 2022-06-21 | 2022-11-01 | 武汉建工集团股份有限公司 | Box-type waste concrete recycling, crushing and processing integrated production line and method |
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Application publication date: 20120620 |