CN110757618A - Method for producing baking-free bricks by comprehensively utilizing furnace slag - Google Patents
Method for producing baking-free bricks by comprehensively utilizing furnace slag Download PDFInfo
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- CN110757618A CN110757618A CN201911049866.0A CN201911049866A CN110757618A CN 110757618 A CN110757618 A CN 110757618A CN 201911049866 A CN201911049866 A CN 201911049866A CN 110757618 A CN110757618 A CN 110757618A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B3/00—Producing shaped articles from the material by using presses; Presses specially adapted therefor
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C21/00—Disintegrating plant with or without drying of the material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03B—SEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS
- B03B9/00—General arrangement of separating plant, e.g. flow sheets
- B03B9/04—General arrangement of separating plant, e.g. flow sheets specially adapted for furnace residues, smeltings, or foundry slags
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B11/00—Apparatus or processes for treating or working the shaped or preshaped articles
- B28B11/24—Apparatus or processes for treating or working the shaped or preshaped articles for curing, setting or hardening
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B17/00—Details of, or accessories for, apparatus for shaping the material; Auxiliary measures taken in connection with such shaping
- B28B17/02—Conditioning the material prior to shaping
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
- C04B20/02—Treatment
-
- 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
-
- 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
- C04B30/00—Compositions for artificial stone, not containing binders
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/0028—Aspects relating to the mixing step of the mortar preparation
- C04B40/0039—Premixtures of ingredients
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- 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
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
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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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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Structural Engineering (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Food Science & Technology (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The invention discloses a method for producing baking-free bricks by comprehensively utilizing furnace slag. The method comprises the steps of performing primary crushing and primary magnetic separation on slag generated after household garbage incineration, performing wet type sand blasting machine and secondary magnetic separation on the slag, enabling the slag to flow into a sawtooth wave jigger, performing buoyancy gravity separation to remove metals, enabling slag sand grains to flow into a wastewater treatment system along with water flow, filtering water to obtain raw material slag, and finally molding the raw material slag into the baking-free brick through a hydraulic brick making machine. The invention adopts slag generated after the household garbage is burnt as a main material, crushed sand and dried mud as auxiliary materials, all the materials adopt waste, and the additive adopts the combination of sodium sulfate, a benzyl naphthalene sulfonate formaldehyde condensation compound and a polymer of 1, 2-ethylenediamine and (chloromethyl) oxirane, so that the strength and the heat preservation performance of the material are enhanced.
Description
Technical Field
The invention belongs to the technical field of recycling and harmless comprehensive utilization of furnace slag, and particularly relates to a method for producing baking-free bricks by comprehensively utilizing the furnace slag.
Background
The slag generated after the waste incineration is quite complex in components, comprises metal, slag blocks, stones, concrete blocks, unburned organic materials and the like, if the slag is directly buried, soil and underground water pollution is caused, the slag contains resources such as iron, copper, nonferrous metals and the like, and if the slag is not recycled, the resource waste is caused, so that the problem that the slag generated after the waste incineration is subjected to resource treatment is urgently needed to be solved.
At present, various schemes are provided for solving the problem of resource utilization of slag, and the selection of baking-free bricks prepared by screening the slag is a good choice. Patent 201510921912.7 discloses a baking-free slag brick: the raw materials of the composite material comprise 21 parts of cement, 56 parts of waste slag, 12 parts of volcanic ash, 10 parts of redispersible latex powder, 3 parts of gypsum, 15 parts of recycled aggregate, 12 parts of plant fiber, 3 parts of hydroxymethyl cellulose and 15 parts of water. The baking-free brick is light in weight, but low in strength and poor in water resistance. Patent 201811492034.1 discloses a baking-free brick and a preparation method thereof, wherein the preparation method comprises the following steps: according to the mass parts, 10-20 parts of alkali activator and 20-40 parts of titanium extraction slag are mixed uniformly, 20-50 parts of steel slag and 8-18 parts of water are added for stirring, and 20-40 parts of steel slag micro powder is added for mixing uniformly to obtain a mixture; and pressing and forming the mixture, and curing to obtain the baking-free brick.
Disclosure of Invention
The invention aims to provide a method for producing baking-free bricks by comprehensively utilizing slag.
A method for producing baking-free bricks by comprehensively utilizing slag comprises the following steps:
(1) slag generated after the household garbage is incinerated is subjected to primary crushing and primary magnetic separation to obtain slag particles with the diameter of less than 100mm and magnetic metal;
(2) sending the slag particles with the diameter less than 100mm into a wet type sand blasting machine through a conveyor belt, fully crushing the slag particles into slag particles with the diameter of 1-4mm, and collecting magnetic metal through secondary magnetic separation;
(3) the slag after the secondary magnetic separation flows into a sawtooth wave jigger, metals are removed through buoyancy gravity separation, slag sand grains with metal substances removed flow into a slag pool along with water through a discharge hole of the jigger, the slag pool is provided with a barrier drainage hole, the slag sand grains flow into a wastewater treatment system along with water flow, and the raw material slag is prepared after water filtration;
(4) taking 200 parts of raw material slag 120-one, 30-80 parts of crushed sand, 20-60 parts of dried mud and 10-50 parts of additive according to parts by weight, adding 80-200 parts of water, and uniformly stirring and mixing;
(5) feeding the stirred material into a hydraulic brick making machine for molding, wherein the molding pressure is 15-25MPa, the pressurization time is 2-4 s, and the pressure maintaining time is 3-5 s;
(6) standing the green brick for 1-3h at normal temperature after the molding is finished; placing the green bricks after standing into a steam curing chamber, and controlling the steam pressure introduced into the steam curing chamber to ensure that the pressure in the steam curing chamber is uniformly increased from 0MPa to 3MPa within 1.5-2 h; then keeping the pressure of the steam-curing room for 3 to 5 hours under the pressure of 3MPa, and then reducing the pressure in the steam-curing room to 0MPa within 1.5 to 2 hours; and finally standing for 2-3h to obtain the baking-free brick.
The additive comprises the following components in parts by weight: 2-10 parts of sodium sulfate, 5-20 parts of benzyl naphthalene sulfonate formaldehyde condensate and 3-20 parts of polymer of 1, 2-ethylenediamine and (chloromethyl) ethylene oxide.
The primary crushing process comprises the following steps: slag is conveyed into a hopper by a forklift and is conveyed into a feeding hole of a screening roller cage by a conveyor belt, the roller cage is a horn-shaped screen capable of continuously rotating, the slag enters from a small opening end of the horn-shaped roller cage, and after passing through the rotating roller cage, slag particles with the diameter of less than 100mm flow out through meshes on the side surface of the roller cage and enter the next process; slag blocks, stone blocks, concrete blocks and massive metals with larger volumes flow out through a large opening end of the horn-shaped rolling cage, are conveyed into a crushing sand machine through a conveyor belt to be crushed for the first time, and then are conveyed back to a second crushing and conveying system through the conveyor belt, and the metals screened manually enter a metal shredder to be processed; the incompletely burnt garbage is manually picked up and is sent back to the garbage incinerator for burning again after being concentrated; the combustible substance of the incompletely combusted garbage is not less than 80%.
The first-stage magnetic separation adopts a suspended magnetic iron remover, and the second-stage magnetic separation adopts a drum-type magnetic iron remover.
According to the theoretical layering rule of a jigging bed layer, the jigging pulsation curve of the sawtooth-shaped jig is in a sawtooth shape, and ascending water flow is faster than descending water flow, so that heavy particle substances in furnace slag are fully settled, and metal particles with heavier specific gravity settle to the bottom of a jig bed layer along with the descending water flow; and the substances with lighter specific gravity are distributed on the upper part of the bed layer of the jigger, flow through a discharging port of the jigger along with water and enter a rolling sieve for dehydration treatment, the dehydrated aggregates are subjected to secondary metal recovery treatment on tailings aggregates by eddy current non-ferrous metal separation, the sludge partially flows into a slag pool, and metal impurities with heavier specific gravity settled at the bottom of the bed layer of the jigger are periodically cleaned out for metal classification.
The method comprises the steps of (3) removing tailings and aggregates of non-ferrous metals through buoyancy gravity separation, recycling secondary light non-ferrous metals by using an eddy current non-ferrous metal separator, setting the magnetic separation strength of the first non-ferrous metal separator to be 4000GS, the conveying capacity of raw materials to be 15 tons/hour, the conveying bandwidth to be 1.5 meters and the rotating speed to be 4 meters/second, the magnetic separation strength of the second metal separator to be 3500GS, the conveying capacity of raw materials to be 10 tons/hour, the conveying bandwidth to be 1.2 meters and the rotating speed to be 3 meters/second, has higher recycling efficiency which is more than two times of common separation equipment, has good separation effect on recycling metal aluminum, can be improved by about 10 percent compared with the common equipment, can effectively automatically separate non-metallic materials from non-ferrous metals such as metal aluminum and the like, has the separation rate of the metal aluminum in the slag to be more than 98 percent, and can be directly used for producing ecological building, the prepared product can be quickly molded, has high strength, has the maximum compressive strength of 35MPa which is far higher than the strength requirement of the common steam-cured brick, and can meet the requirements of various engineering building materials.
The washing water of the wet-type sand blasting machine and the make-up water of the jigger are discharged into a slag pool through the jigger, and are guided into a circulating water pool after slag particles are blocked by a barrier at the bottom of a slag storage area, so that the washing water can be recycled; rainwater can be collected to the circulation pond, partial river course water carries out recycle, and water treatment circulation system workshop jigging machine goes out the water and flows into the storage slag pond and separate the sediment, separates to stay after the mud sediment that the gravity flow gets into sediment pond, sedimentation tank and circulation pond, at sediment pond and sedimentation tank, regularly carries out coagulating sedimentation and disinfection to sewage and handles, and the water after the processing passes through the circulating pump, recycles in the workshop to reach the zero release, can not lead to the fact the influence to the surrounding environment.
The invention has the beneficial effects that: the invention adopts slag generated after the household garbage is burnt as a main material, crushed sand and dried mud as auxiliary materials, all adopts waste, and the additive adopts the combination of sodium sulfate, a benzyl naphthalene sulfonate formaldehyde condensation compound and a polymer of 1, 2-ethylenediamine and (chloromethyl) ethylene oxide, thereby enhancing the strength and the heat preservation performance of the material. The invention also adopts a multistage metal recovery process to effectively recover metal materials, reduce the pollution of heavy metals to the external environment and realize the recycling of resources. The baking-free brick has high strength, because the recovery of aggregate light metal aluminum by adopting an eddy current non-ferrous metal recovery system reaches more than 98 percent, the content of aluminum metal in the aggregate is reduced, the characteristic that aluminum metal is easy to oxidize is effectively avoided, the strength and the stability of the baking-free brick are improved, the baking-free brick is directly used for producing ecological building materials after specific modification treatment, the prepared product can be quickly molded, the strength is high, the maximum compressive strength reaches 35MPa, the strength far exceeds the strength requirement of common steam-cured bricks, and the requirements of various engineering building materials can be met.
Drawings
FIG. 1 is a process flow chart of the comprehensive utilization of slag for producing baking-free bricks.
Detailed Description
The present invention is further illustrated by the following specific examples.
Example 1
A method for producing baking-free bricks by comprehensively utilizing slag comprises the following steps:
(1) slag generated after the household garbage is incinerated is subjected to primary crushing and primary magnetic separation to obtain slag particles with the diameter of less than 100mm and magnetic metal;
(2) sending the slag particles with the diameter less than 100mm into a wet type sand blasting machine through a conveyor belt, fully crushing the slag particles into slag particles with the diameter of 2mm, and collecting magnetic metal through secondary magnetic separation;
(3) the slag after the secondary magnetic separation flows into a sawtooth wave jigger, metals are removed through buoyancy gravity separation, slag sand grains with metal substances removed flow into a slag pool along with water through a discharge hole of the jigger, the slag pool is provided with a barrier drainage hole, the slag sand grains flow into a wastewater treatment system along with water flow, and the raw material slag is prepared after water filtration;
(4) taking 180 parts of raw material slag, 50 parts of crushed sand, 40 parts of dried mud and 20 parts of additive according to parts by weight, adding 120 parts of water, and uniformly stirring and mixing; the additive comprises the following components in parts by weight: 6 parts of sodium sulfate, 8 parts of a benzyl naphthalene sulfonate formaldehyde condensate, and 6 parts of a polymer of 1, 2-ethylenediamine and (chloromethyl) ethylene oxide;
(5) feeding the stirred material into a hydraulic brick making machine for molding, wherein the molding pressure is 20MPa, the pressurization time is 3s, and the pressure maintaining time is 4 s;
(6) standing the green brick for 2 hours at normal temperature after the forming is finished; placing the green bricks after standing into a steam curing chamber, and controlling the steam pressure introduced into the steam curing chamber to enable the pressure in the steam curing chamber to be uniformly increased from 0MPa to 3MPa within 1.8 h; then keeping the pressure of the steam-curing chamber for 3 hours under the pressure of 3MPa, and then reducing the pressure in the steam-curing chamber to 0MPa within 1.8 hours; and finally standing for 2 hours to obtain the baking-free brick.
Example 2
A method for producing baking-free bricks by comprehensively utilizing slag comprises the following steps:
(1) slag generated after the household garbage is incinerated is subjected to primary crushing and primary magnetic separation to obtain slag particles with the diameter of less than 100mm and magnetic metal;
(2) sending the slag particles with the diameter less than 100mm into a wet type sand blasting machine through a conveyor belt, fully crushing the slag particles into slag particles with the diameter of 3mm, and collecting magnetic metal through secondary magnetic separation;
(3) the slag after the secondary magnetic separation flows into a sawtooth wave jigger, metals are removed through buoyancy gravity separation, slag sand grains with metal substances removed flow into a slag pool along with water through a discharge hole of the jigger, the slag pool is provided with a barrier drainage hole, the slag sand grains flow into a wastewater treatment system along with water flow, and the raw material slag is prepared after water filtration;
(4) taking 150 parts of raw material slag, 35 parts of crushed sand, 25 parts of dried mud and 15 parts of additive according to parts by weight, adding 90 parts of water, and uniformly stirring and mixing; the additive comprises the following components in parts by weight: 3 parts of sodium sulfate, 6 parts of a benzyl naphthalene sulfonate formaldehyde condensate, and 6 parts of a polymer of 1, 2-ethylenediamine and (chloromethyl) ethylene oxide;
(5) feeding the stirred material into a hydraulic brick making machine for molding, wherein the molding pressure is 18MPa, the pressurization time is 4s, and the pressure maintaining time is 5 s;
(6) standing the green brick for 3 hours at normal temperature after the forming is finished; placing the green bricks after standing into a steam curing chamber, and controlling the steam pressure introduced into the steam curing chamber to enable the pressure in the steam curing chamber to be uniformly increased from 0MPa to 3MPa within 1.5 h; then keeping the pressure of the steam-curing chamber for 3 hours under the pressure of 3MPa, and then reducing the pressure in the steam-curing chamber to 0MPa within 1.5 hours; and finally standing for 3 hours to obtain the baking-free brick.
Example 3
A method for producing baking-free bricks by comprehensively utilizing slag comprises the following steps:
(1) slag generated after the household garbage is incinerated is subjected to primary crushing and primary magnetic separation to obtain slag particles with the diameter of less than 100mm and magnetic metal;
(2) sending the slag particles with the diameter less than 100mm into a wet type sand blasting machine through a conveyor belt, fully crushing the slag particles into slag particles with the diameter of 2mm, and collecting magnetic metal through secondary magnetic separation;
(3) the slag after the secondary magnetic separation flows into a sawtooth wave jigger, metals are removed through buoyancy gravity separation, slag sand grains with metal substances removed flow into a slag pool along with water through a discharge hole of the jigger, the slag pool is provided with a barrier drainage hole, the slag sand grains flow into a wastewater treatment system along with water flow, and the raw material slag is prepared after water filtration;
(4) taking 180 parts of raw material slag, 50 parts of crushed sand, 40 parts of dried mud and 12 parts of an additive according to parts by weight, adding 120 parts of water, and uniformly stirring and mixing; the additive comprises the following components in parts by weight: 6 parts of sodium sulfate, 6 parts of a polymer of 1, 2-ethylenediamine and (chloromethyl) oxirane;
(5) feeding the stirred material into a hydraulic brick making machine for molding, wherein the molding pressure is 20MPa, the pressurization time is 3s, and the pressure maintaining time is 4 s;
(6) standing the green brick for 2 hours at normal temperature after the forming is finished; placing the green bricks after standing into a steam curing chamber, and controlling the steam pressure introduced into the steam curing chamber to enable the pressure in the steam curing chamber to be uniformly increased from 0MPa to 3MPa within 1.8 h; then keeping the pressure of the steam-curing chamber for 3 hours under the pressure of 3MPa, and then reducing the pressure in the steam-curing chamber to 0MPa within 1.8 hours; and finally standing for 2 hours to obtain the baking-free brick.
Example 4
A method for producing baking-free bricks by comprehensively utilizing slag comprises the following steps:
(1) slag generated after the household garbage is incinerated is subjected to primary crushing and primary magnetic separation to obtain slag particles with the diameter of less than 100mm and magnetic metal;
(2) sending the slag particles with the diameter less than 100mm into a wet type sand blasting machine through a conveyor belt, fully crushing the slag particles into slag particles with the diameter of 2mm, and collecting magnetic metal through secondary magnetic separation;
(3) the slag after the secondary magnetic separation flows into a sawtooth wave jigger, metals are removed through buoyancy gravity separation, slag sand grains with metal substances removed flow into a slag pool along with water through a discharge hole of the jigger, the slag pool is provided with a barrier drainage hole, the slag sand grains flow into a wastewater treatment system along with water flow, and the raw material slag is prepared after water filtration;
(4) taking 180 parts of raw material slag, 50 parts of crushed sand, 40 parts of dried mud and 12 parts of an additive according to parts by weight, adding 120 parts of water, and uniformly stirring and mixing; the additive comprises the following components in parts by weight: 6 parts of sodium sulfate and 8 parts of benzyl naphthalene sulfonate formaldehyde condensate;
(5) feeding the stirred material into a hydraulic brick making machine for molding, wherein the molding pressure is 20MPa, the pressurization time is 3s, and the pressure maintaining time is 4 s;
(6) standing the green brick for 2 hours at normal temperature after the forming is finished; placing the green bricks after standing into a steam curing chamber, and controlling the steam pressure introduced into the steam curing chamber to enable the pressure in the steam curing chamber to be uniformly increased from 0MPa to 3MPa within 1.8 h; then keeping the pressure of the steam-curing chamber for 3 hours under the pressure of 3MPa, and then reducing the pressure in the steam-curing chamber to 0MPa within 1.8 hours; and finally standing for 2 hours to obtain the baking-free brick.
Example 5
A method for producing baking-free bricks by comprehensively utilizing slag comprises the following steps:
(1) slag generated after the household garbage is incinerated is subjected to primary crushing and primary magnetic separation to obtain slag particles with the diameter of less than 100mm and magnetic metal;
(2) sending the slag particles with the diameter less than 100mm into a wet type sand blasting machine through a conveyor belt, fully crushing the slag particles into slag particles with the diameter of 2mm, and collecting magnetic metal through secondary magnetic separation;
(3) the slag after the secondary magnetic separation flows into a sawtooth wave jigger, metals are removed through buoyancy gravity separation, slag sand grains with metal substances removed flow into a slag pool along with water through a discharge hole of the jigger, the slag pool is provided with a barrier drainage hole, the slag sand grains flow into a wastewater treatment system along with water flow, and the raw material slag is prepared after water filtration;
(4) taking 180 parts of raw material slag, 50 parts of crushed sand, 40 parts of dried mud and 6 parts of sodium sulfate according to parts by weight, adding 120 parts of water, and uniformly stirring and mixing;
(5) feeding the stirred material into a hydraulic brick making machine for molding, wherein the molding pressure is 20MPa, the pressurization time is 3s, and the pressure maintaining time is 4 s;
(6) standing the green brick for 2 hours at normal temperature after the forming is finished; placing the green bricks after standing into a steam curing chamber, and controlling the steam pressure introduced into the steam curing chamber to enable the pressure in the steam curing chamber to be uniformly increased from 0MPa to 3MPa within 1.8 h; then keeping the pressure of the steam-curing chamber for 3 hours under the pressure of 3MPa, and then reducing the pressure in the steam-curing chamber to 0MPa within 1.8 hours; and finally standing for 2 hours to obtain the baking-free brick.
Experimental example:
according to the requirements of the national standard GB T2542-2012 test method for wall bricks, the products prepared in the examples 1-5 are prepared into test pieces, the dry density, the mechanical property and the heat conductivity coefficient of the test pieces are tested, and the test results are shown in tables 1-2:
TABLE 1
Note: represents P <0.05 compared to the example 1 group; p < 0.01.
As can be seen from Table 1, the dry densities of examples 1-5 are all below 450kg/m3Is superior to the commercial products; the thermal conductivity of the products prepared in examples 3-4 was significantly higher than that of example 1, and the thermal conductivity of the product prepared in example 5 was significantly higher than that of example 1.
TABLE 2
Note: represents P <0.05 compared to the example 1 group; p < 0.01.
As can be seen from Table 2, the compressive strengths of the products prepared in examples 3-4 are significantly lower than those of example 1, and the compressive strength of the product prepared in example 5 is significantly lower than that of example 1; the flexural strength of the products prepared in examples 3 to 4 is significantly lower than that of example 1, and the flexural strength of the product prepared in example 5 is very significantly lower than that of example 1.
The method for producing the baking-free brick by comprehensively utilizing the slag provided by the invention is described in detail above. The principles and embodiments of the present invention are explained herein using specific examples, which are presented only to assist in understanding the core concepts of the present invention. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
Claims (7)
1. The method for producing the baking-free brick by comprehensively utilizing the furnace slag is characterized by comprising the following steps of:
(1) slag generated after the household garbage is incinerated is subjected to primary crushing and primary magnetic separation to obtain slag particles with the diameter of less than 100mm and magnetic metal;
(2) sending the slag particles with the diameter less than 100mm into a wet type sand blasting machine through a conveyor belt, fully crushing the slag particles into slag particles with the diameter of 1-4mm, and collecting magnetic metal through secondary magnetic separation;
(3) the slag after the secondary magnetic separation flows into a sawtooth wave jigger, metals are removed through buoyancy gravity separation, slag sand grains with metal substances removed flow into a slag pool along with water through a discharge hole of the jigger, the slag pool is provided with a barrier drainage hole, the slag sand grains flow into a wastewater treatment system along with water flow, and the raw material slag is prepared after water filtration;
(4) taking 200 parts of raw material slag 120-one, 30-80 parts of crushed sand, 20-60 parts of dried mud and 10-50 parts of additive according to parts by weight, adding 80-200 parts of water, and uniformly stirring and mixing;
(5) feeding the stirred material into a hydraulic brick making machine for molding, wherein the molding pressure is 15-25MPa, the pressurization time is 2-4 s, and the pressure maintaining time is 3-5 s;
(6) standing the green brick for 1-3h at normal temperature after the molding is finished; placing the green bricks after standing into a steam curing chamber, and controlling the steam pressure introduced into the steam curing chamber to ensure that the pressure in the steam curing chamber is uniformly increased from 0MPa to 3MPa within 1.5-2 h; then keeping the pressure of the steam-curing room for 3 to 5 hours under the pressure of 3MPa, and then reducing the pressure in the steam-curing room to 0MPa within 1.5 to 2 hours; and finally standing for 2-3h to obtain the baking-free brick.
2. The method for producing baking-free bricks by comprehensively utilizing the slag according to claim 1, wherein the additive comprises the following components in parts by weight: 2-10 parts of sodium sulfate, 5-20 parts of benzyl naphthalene sulfonate formaldehyde condensate and 3-20 parts of polymer of 1, 2-ethylenediamine and (chloromethyl) ethylene oxide.
3. The method for producing baking-free bricks by comprehensively utilizing the slag according to claim 1, wherein the primary crushing process comprises the following steps: slag is conveyed into a hopper by a forklift and is conveyed into a feeding hole of a screening roller cage by a conveyor belt, the roller cage is a horn-shaped screen capable of continuously rotating, the slag enters from a small opening end of the horn-shaped roller cage, and after passing through the rotating roller cage, slag particles with the diameter of less than 100mm flow out through meshes on the side surface of the roller cage and enter the next process; slag blocks, stone blocks, concrete blocks and massive metals with larger volumes flow out through a large opening end of the horn-shaped rolling cage, are conveyed into a crushing sand machine through a conveyor belt to be crushed for the first time, and then are conveyed back to a second crushing and conveying system through the conveyor belt, and the metals screened manually enter a metal shredder to be processed; the incompletely burnt garbage is manually picked up and is sent back to the garbage incinerator for burning again after being concentrated; the combustible substance of the incompletely combusted garbage is not less than 80%.
4. The method for producing baking-free bricks by comprehensively utilizing the slag according to claim 1, wherein a suspended magnetic iron remover is adopted for the primary magnetic separation, and a roller-type magnetic iron remover is adopted for the secondary magnetic separation.
5. The method for producing baking-free bricks by comprehensively utilizing the slag according to claim 1, wherein the sawtooth wave jigger is characterized in that a jigging pulse curve is sawtooth-shaped according to a theoretical layering rule of a jigging bed layer, and ascending water flow is faster than descending water flow, so that heavy particulate matters in the slag are fully settled, and metal particles with heavier specific gravity settle to the bottom of a jigging machine bed layer along with the descending water flow; and the substances with lighter specific gravity are distributed on the upper part of the bed layer of the jigger, flow through a discharging port of the jigger along with water and enter a rolling sieve for dehydration treatment, the dehydrated aggregates are subjected to secondary metal recovery treatment on tailings aggregates by eddy current non-ferrous metal separation, the sludge partially flows into a slag pool, and metal impurities with heavier specific gravity settled at the bottom of the bed layer of the jigger are periodically cleaned out for metal classification.
6. The method for producing baking-free bricks by comprehensively utilizing the slag according to claim 1, wherein the tailings aggregates of the nonferrous metals are removed by buoyancy gravity separation in the step (3), and then the eddy current nonferrous metal separator is used for secondary recovery of the light nonferrous metals, wherein the magnetic separation strength of the first nonferrous metal separator is set to be 4000GS, the conveying amount of raw materials is about 15 tons/h, the conveying belt width is 1.5 m, the rotating speed is 4 m/s, the magnetic separation strength of the second nonferrous metal separator is 3500GS, the conveying amount of raw materials is about 10 tons/h, the conveying belt width is 1.2 m, and the rotating speed is 3 m/s.
7. The method for producing baking-free bricks by comprehensively utilizing the slag according to claim 1, wherein the washing water of the wet sand blasting machine and the make-up water of the jigger are discharged into a slag pool through the jigger, and are guided into a circulating water pool after slag particles are blocked by a barrier at the bottom of a slag storage area, so that the washing water can be recycled; rainwater can be collected to the circulation pond, partial river course water carries out recycle, and water treatment circulation system workshop jigging machine goes out the water and flows into the storage slag pond and separate the sediment, separates to stay after the mud sediment that the gravity flow gets into sediment pond, sedimentation tank and circulation pond, at sediment pond and sedimentation tank, regularly carries out coagulating sedimentation and disinfection to sewage and handles, and the water after the processing passes through the circulating pump, recycles in the workshop to reach the zero release, can not lead to the fact the influence to the surrounding environment.
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