CN110937835A - Method for resource utilization of waste incineration slag - Google Patents

Method for resource utilization of waste incineration slag Download PDF

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Publication number
CN110937835A
CN110937835A CN201911355758.6A CN201911355758A CN110937835A CN 110937835 A CN110937835 A CN 110937835A CN 201911355758 A CN201911355758 A CN 201911355758A CN 110937835 A CN110937835 A CN 110937835A
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CN
China
Prior art keywords
slag
sand
waste incineration
iron
stirring
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.)
Pending
Application number
CN201911355758.6A
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Chinese (zh)
Inventor
李林
陈杰
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hunan Military Environmental Protection Ltd By Share Ltd
Original Assignee
Hunan Military Environmental Protection Ltd By Share Ltd
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Filing date
Publication date
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Priority to CN201911355758.6A priority Critical patent/CN110937835A/en
Publication of CN110937835A publication Critical patent/CN110937835A/en
Pending legal-status Critical Current

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    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B18/00Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
    • C04B18/04Waste materials; Refuse
    • C04B18/06Combustion residues, e.g. purification products of smoke, fumes or exhaust gases
    • C04B18/10Burned or pyrolised refuse
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B28/00Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
    • C04B28/02Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
    • C04B28/06Aluminous cements
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2111/00Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/00017Aspects relating to the protection of the environment
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02WCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00Technologies for solid waste management
    • Y02W30/50Reuse, recycling or recovery technologies
    • Y02W30/91Use of waste materials as fillers for mortars or concrete

Abstract

The invention discloses a method for resource utilization of waste incineration slag, which comprises the following steps: sieving the waste incineration slag, and removing blocky substances; crushing the screened waste incinerator slag to 40-100 mm; separating and recovering iron substances in the crushed waste incineration slag; and crushing the garbage incinerator slag after the iron material is recovered to a particle size of less than or equal to 4.75mm to obtain a slag sand product. The method for recycling the waste incineration slag can prepare the waste incineration slag into slag sand products meeting the requirements, can effectively treat the waste incineration slag, recycle useful metal substances, can reduce the problem of river sand consumption in construction projects, has the advantages of simple process, convenience in operation, low cost, high recycling utilization rate, no secondary pollution and the like, and has high use value and good application prospect.

Description

Method for resource utilization of waste incineration slag
Technical Field
The invention relates to a method for resource utilization of waste incineration slag.
Background
The waste incineration slag is mainly used for brick making or landfill disposal, the slag is used for brick making and is directly used as a building material, the requirement on strength is generally high, and the slag is processedThe finished product after the treatment hardly meets the requirements of the bricks for high-rise buildings, and can only be used for ordinary sporadic engineering construction with low structural safety requirements, so that under the condition of the prior art, the full treatment of the incineration slag as a building material is difficult to realize resource utilization, most of the garbage incineration slag in each large city still adopts landfill treatment, land resources occupied by the landfill treatment are very large, and metal substances contained in the slag are buried together without secondary utilization, so that the waste is very large. The estimated time of the incineration plant which treats 180 ten thousand tons of garbage per year is 30 years, and the landfill amount is reduced by 20 percent. In the operation period of the waste incineration plant, the slag production amount is 36 ten thousand tons per year, the required landfill capacity is 22.5 ten thousand m per year according to the estimation of the mass ratio of 1.63The required landfill storage capacity is 675 ten thousand meters calculated according to the 30-year running time3. At present, a method and equipment for resource utilization of waste incineration slag are not available. Therefore, how to effectively realize the resource utilization of the waste incineration slag has very important significance.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a method for recycling waste incineration slag, which has high recycling utilization rate and no secondary pollution.
In order to solve the technical problems, the invention adopts the following technical scheme:
a method for resource utilization of waste incineration slag comprises the following steps:
s1, sieving the waste incineration slag, and removing blocks;
s2, crushing the garbage incinerator slag sieved in the step S1 to 40-100 mm;
s3, separating and recovering iron substances in the crushed waste incineration slag in the step S2;
s4, crushing the garbage incinerator slag with the iron materials recovered in the step S3 to a particle size of less than or equal to 4.75mm, and obtaining a slag sand product.
In the method, the slag sand product is prepared by a waste incineration slag recycling treatment system; waste incinerator sediment resourceful treatment system includes:
the vibrating feeder is used for removing the blocks in the waste incineration slag;
the crusher is butted with the vibrating feeder and is used for crushing the waste incineration slag after the blocky objects are removed;
the iron remover is butted with the crusher through a first conveying belt and is used for separating and recovering iron substances in the crushed waste incineration slag;
the sand making machine is used for crushing the garbage incinerator slag after iron removal into particles;
and the vibrating screen classifier is butted with the sand making machine through a second conveying belt and is used for screening granular slag, and the screened slag is qualified slag sand products.
In the method, the vibration screening machine is in butt joint with the sand making machine through a third conveying belt and is used for conveying screened unqualified slag sand products to the sand making machine.
In the method, a finished product bin is arranged at the downstream of the vibrating screen machine, and the vibrating screen machine is in butt joint with the finished product bin through a fourth conveying belt.
In a further development of the method according to the invention, the treatment system further comprises a storage room for storing untreated slag, the waste incineration slag in the storage room being fed into the vibratory feeder by means of a loader.
In the method, the iron remover is further improved and is externally connected with a collector for collecting iron substances.
In the above method, further improvement, the method further includes step S5: and (4) mixing the slag sand product prepared in the step (S4), sludge, cement and a curing agent to finish the treatment of the sludge.
In the above method, further improvement, the step S5 specifically includes:
s5-1, mixing the slag sand product, the sludge, the cement and the curing agent to obtain a material mixture;
s5-2, performing primary stirring on the material mixture obtained in the step S5-1;
s5-3, carrying out secondary stirring on the material mixture subjected to primary stirring in the step S5-2;
and S5-4, burying the material mixture subjected to the secondary stirring in the step S5-3 to finish the treatment of the sludge.
In the step S5-1, the mass ratio of the slag sand product, the sludge, the cement and the curing agent is 0.2-0.3: 1.0: 0.1-0.2: 0.03-0.12; the cement is sulphoaluminate cement, ordinary portland cement and slag portland cement; the curing agent is NTMC 4.
In the step S5-2, the rotation speed of the first-stage stirring is 30 ± 2r/min to 50 ± 2 r/min; the first-stage stirring time is 1-3 min;
in the step S5-3, the rotation speed of the secondary stirring is 30 +/-2 r/min-40 +/-2 r/min; the secondary stirring time is 20-50 s.
Compared with the prior art, the invention has the advantages that:
(1) the invention provides a method for recycling waste incineration slag, which is characterized in that the waste incineration slag is subjected to treatment such as removal of blocks, crushing, separation and recovery of iron substances, crushing and the like, so that the waste incineration slag can be prepared into a slag sand product, and the slag sand product meets the standard of building sand, so that river sand can be replaced to be used as a building auxiliary material, and the recycling of the slag is realized. The method for recycling the waste incineration slag can prepare the waste incineration slag into slag sand products meeting the requirements, can effectively treat the waste incineration slag, recycle useful metal substances, can reduce the problem of river sand consumption in construction projects, has the advantages of simple process, convenience in operation, low cost, high recycling utilization rate, no secondary pollution and the like, and has high use value and good application prospect.
(2) In the method, the slag sand product is prepared by utilizing the waste incineration slag recycling treatment system, the whole process is automatically controlled by the system, and the feeding from the slag and the discharging of the finished product are automatically controlled, so that the operation intensity is reduced, and the operation efficiency is improved.
(3) According to the invention, the waste incineration slag is made into the slag sand product meeting the requirements, and the slag sand product is further used for treating the sludge, so that the landfill treatment of the sludge can be realized, the singleness and limitation of material selection under the current market operation conditions are broken through, the supply interruption situation of non-renewable materials is avoided, the economic benefit is obvious, the slag is changed into valuables, the waste is treated by waste, and the requirements of national industrial policies and sustainable development of economic society are met.
Drawings
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention.
FIG. 1 is a schematic view of a refuse incinerator slag recycling system in embodiment 1 of the present invention.
The reference numerals in the figures denote:
1. a storage room; 2. a vibrating feeder; 3. a crusher; 41. a first conveyor belt; 42. a second conveyor belt; 43. a third conveyor belt; 44. a fourth conveyor belt; 5. a de-ironing separator; 6. a sand making machine; 7. a vibrating screen classifier; 8. a finished product warehouse; 9. a collector.
Detailed Description
The invention is further described below with reference to the drawings and specific preferred embodiments of the description, without thereby limiting the scope of protection of the invention.
Example 1
A method for resource utilization of waste incineration slag comprises the following steps:
(1) preparing the waste incineration slag into a slag sand product, which specifically comprises the following steps:
(1.1) the waste incineration slag is conveyed to a specified storage room by a special transport vehicle, and is fed to a vibrating feeder (preferably, the sieve surface size of the vibrating feeder is 1500 x 4000, the motor power is 2 x 2.2KW, and the processing capacity is 10-40t/h) from the storage room through a loader, and the vibrating feeder mainly removes blocks with overlarge particle size.
(1.2) the residual slag from which the lumps are removed in step (1.1) is dropped directly into a crusher (preferably a jaw crusher model: PE250 x 400) and the slag is crushed to 40-100 mm.
(1.3) conveying the slag in the step (1.1) to a deironing device (preferably model: RCYD (C) -6.5) through a first conveying belt, separating the ferrous substances, and collecting the ferrous substances by a collector.
(1.4) feeding the iron-removed slag into a sand making machine (preferably, the model is PCX8080), crushing the slag by the sand making machine until the grain size is 3mm, conveying the granulated slag to a vibrating screen classifier through a second conveying belt, screening by the vibrating screen classifier, and conveying the slag with qualified grain size to a finished product bin through a fourth conveying belt to obtain a slag sand product. And (4) the screened and remaining slag which does not meet the specification enters the sand making machine again through a third conveying belt for further fine crushing (circularly performing) until all the slag meets the specification requirement. The dust generated in the production process is collected by a bag-type dust collector, so that the environment is not polluted.
The particle size of the finished sand (namely, the slag sand product) prepared in the step (1) is less than 4.75mm, the fineness modulus is 3.0-2.3, the content of mud particles and stone powder less than 75 mu m is less than or equal to 5%, the maximum crushing index of a single stage is less than or equal to 30%, the water content is less than or equal to 14%, and the finished product is clean, free of impurities and free of agglomeration, namely, the mud content, the impurity content and the crushing value in the prepared finished sand (namely, the slag sand product) all meet the requirements of building sand (GB/T14684-2011). The main component of the waste incineration slag is bottom ash which is an uneven mixture consisting of slag, glass, ceramic substance fragments, iron, other metals and other incombustible substances and organic matters which are not completely combusted, and after a series of treatments in the step (1), a finished product (namely a slag sand product) prepared from the waste incineration slag can replace river sand to be used as a building auxiliary material to realize slag recycling.
In step (1), the slag sand product is prepared by a waste incinerator slag recycling system, as shown in fig. 1, the waste incinerator slag recycling system includes:
the vibrating feeder 2 is used for removing the blocks in the waste incineration slag;
the crusher 3 is butted with the vibrating feeder 2 and is used for crushing the garbage incinerator slag after the blocky objects are removed;
the iron remover 5 is butted with the crusher 3 through a first conveying belt 41 and is used for separating and recovering iron substances in the crushed waste incineration slag;
a sand making machine 6 for crushing the refuse incinerator slag after iron removal into particles;
and the vibrating screen classifier 7 is butted with the sand making machine 6 through a second conveying belt 42 and is used for screening granular slag, and the screened slag is qualified slag sand products.
In this embodiment, the vibrating screen machine 7 is connected to the sand making machine 6 through a third conveying belt 43, and is configured to convey the screened-out unqualified slag sand products to the sand making machine 6.
In this embodiment, a finished product bin 8 is disposed downstream of the vibrating screen machine 7, and the vibrating screen machine 7 is butted with the finished product bin 8 through a fourth conveying belt 44.
In this embodiment, the treatment system further includes a storage room 1 for storing untreated slag, and the waste incineration slag in the storage room 1 is loaded into the vibrating feeder 2 through a loader.
In this embodiment, the iron remover 5 is externally connected with a collector 9 for collecting iron substances.
In this embodiment, the working principle of the waste incineration slag recycling system is as follows: as shown in fig. 1, the waste incineration slag is transported to a designated storage room 1 by a special transport vehicle, the waste incineration slag is fed from the storage room 1 to a vibrating feeder 2 (preferably 1500 × 4000 sieve surface size of the vibrating feeder, 2 × 2.2KW motor power, 10-40t/h processing capacity), the vibrating feeder 2 mainly removes blocks with overlarge particle size, the residual slag directly falls into a crusher 3 (preferably a jaw crusher model: PE250 × 400), the slag is crushed to 40-100mm, the slag is conveyed to an iron remover 5 (preferably a model: rcyd (c) — 6.5) through a first conveying belt 41, the iron substance is separated, the iron substance is collected by a collector 9, a sand making machine 6 is arranged below the iron remover 5, the slag after iron removal enters a sand making machine 6 (preferably a model: PCX8080), the slag is crushed to 3mm particle size, and the granulated slag is conveyed to the vibrating screen 7 through the second conveying belt 42, is screened by the vibrating screen 7, is conveyed to the finished product bin 8 through the fourth conveying belt 44, and is screened to obtain the remaining slag which does not meet the specification, and is re-conveyed to the sand making machine 6 through the third conveying belt 43 to be further finely crushed (circularly processed) until all the slag meets the specification requirement.
(2) The sludge treatment by utilizing the slag sand product prepared from the waste incineration slag in the step (1) specifically comprises the following steps:
(2.1) mixing the slag sand product, the sludge (dewatered sludge of municipal sewage plants, the water content is generally 70-85%), the cement (commercially available sulphoaluminate cement) and the curing agent (commercially available NTMC4) according to the mass ratio of the slag sand product, the sludge, the cement and the curing agent being 0.2: 1.0: 0.15: 0.08 to obtain a material mixture.
And (2.2) carrying out primary stirring on the material mixture obtained in the step (2.1) for 2min at the rotating speed of 45 +/-2 r/min.
And (2.3) carrying out secondary stirring on the material mixture subjected to primary stirring in the step (2.2) for 30s at the rotating speed of 30 +/-2 r/min.
And (2.4) discharging the material mixture subjected to the secondary stirring in the step (2.3) from a discharge opening, and adopting a loader or eight rear wheels to receive materials. And (4) conveying the sludge which is loaded by the vehicle and uniformly mixed to a stacking area of a special solidified sludge area for landfill, and finishing a covering measure after shaping by an excavator to finish the treatment of the sludge.
The above examples are merely preferred embodiments of the present invention, and the scope of the present invention is not limited to the above examples. All technical schemes belonging to the idea of the invention belong to the protection scope of the invention. It should be noted that modifications and embellishments within the scope of the invention may be made by those skilled in the art without departing from the principle of the invention, and such modifications and embellishments should also be considered as within the scope of the invention.

Claims (10)

1. A method for resource utilization of waste incineration slag is characterized by comprising the following steps:
s1, sieving the waste incineration slag, and removing blocks;
s2, crushing the garbage incinerator slag sieved in the step S1 to 40-100 mm;
s3, separating and recovering iron substances in the crushed waste incineration slag in the step S2;
s4, crushing the garbage incinerator slag with the iron materials recovered in the step S3 to a particle size of less than or equal to 4.75mm, and obtaining a slag sand product.
2. The method of claim 1, wherein the slag sand product is prepared by a waste incineration slag recycling system; waste incinerator sediment resourceful treatment system includes:
the vibrating feeder (2) is used for removing the blocks in the waste incineration slag;
the crusher (3) is butted with the vibrating feeder (2) and is used for crushing the garbage incinerator slag after the blocky objects are removed;
the iron remover (5) is butted with the crusher (3) through a first conveying belt (41) and is used for separating and recovering iron substances in the crushed waste incineration slag;
the sand making machine (6) is used for crushing the garbage incinerator slag subjected to iron removal into particles;
and the vibrating screen classifier (7) is butted with the sand making machine (6) through a second conveying belt (42) and is used for screening granular slag, and the screened slag is qualified slag sand products.
3. Method according to claim 2, characterized in that the vibratory screen machine (7) is interfaced with the sand maker (6) by means of a third conveyor belt (43) for conveying screened off reject slag sand products to the sand maker (6).
4. Method according to claim 2, characterized in that downstream of the vibratory screening machine (7) a finished product bin (8) is provided, the vibratory screening machine (7) being docked with the finished product bin (8) by means of a fourth conveyor belt (44).
5. A method according to any one of claims 2-4, characterized in that the treatment system further comprises a storage room (1) for storing untreated slag, the waste incineration slag in the storage room (1) being fed into the vibratory feeder (2) by means of a loader.
6. A method according to any of claims 2-4, characterized in that the iron separator (5) is externally connected to a collector (9) for collecting the ferrous material.
7. The method according to claim 1, further comprising step S5: and (4) mixing the slag sand product prepared in the step (S4), sludge, cement and a curing agent to finish the treatment of the sludge.
8. The method according to claim 7, wherein the step S5 is specifically:
s5-1, mixing the slag sand product, the sludge, the cement and the curing agent to obtain a material mixture;
s5-2, performing primary stirring on the material mixture obtained in the step S5-1;
s5-3, carrying out secondary stirring on the material mixture subjected to primary stirring in the step S5-2;
and S5-4, burying the material mixture subjected to the secondary stirring in the step S5-3 to finish the treatment of the sludge.
9. The method according to claim 8, wherein in step S5-1, the mass ratio of the slag sand product, the sludge, the cement and the curing agent is 0.2-0.3: 1.0: 0.1-0.2: 0.03-0.12; the cement is sulphoaluminate cement, ordinary portland cement and slag portland cement; the curing agent is NTMC 4.
10. The method according to claim 9, wherein in step S5-2, the rotation speed of the primary stirring is 30 ± 2r/min to 50 ± 2 r/min; the first-stage stirring time is 1-3 min;
in the step S5-3, the rotation speed of the secondary stirring is 30 +/-2 r/min-40 +/-2 r/min; the secondary stirring time is 20-50 s.
CN201911355758.6A 2019-12-25 2019-12-25 Method for resource utilization of waste incineration slag Pending CN110937835A (en)

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Publication number Priority date Publication date Assignee Title
CN111499310A (en) * 2020-05-15 2020-08-07 南宁市吉发环保科技有限公司 Method for producing dry powder mortar by recycling waste incineration slag

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Publication number Priority date Publication date Assignee Title
CN102515600A (en) * 2011-12-08 2012-06-27 上海浦东路桥建设股份有限公司 Groove backfill material using garbage incinerator slag as raw material, production method and application thereof
EP2818250B1 (en) * 2013-06-27 2019-11-20 NUA Abfallwirtschaft GmbH Method for the treatment of refuse incineration slag
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111499310A (en) * 2020-05-15 2020-08-07 南宁市吉发环保科技有限公司 Method for producing dry powder mortar by recycling waste incineration slag

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