CN111620580A - Production process of sintered building aggregate - Google Patents
Production process of sintered building aggregate Download PDFInfo
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- CN111620580A CN111620580A CN202010503250.2A CN202010503250A CN111620580A CN 111620580 A CN111620580 A CN 111620580A CN 202010503250 A CN202010503250 A CN 202010503250A CN 111620580 A CN111620580 A CN 111620580A
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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
- C04B18/00—Use 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
- C04B18/02—Agglomerated materials, e.g. artificial aggregates
- C04B18/023—Fired or melted materials
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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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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D15/00—Handling or treating discharged material; Supports or receiving chambers therefor
- F27D15/02—Cooling
- F27D15/0206—Cooling with means to convey the charge
- F27D15/0213—Cooling with means to convey the charge comprising a cooling grate
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
- F27D17/004—Systems for reclaiming waste heat
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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
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
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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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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Ceramic Engineering (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Civil Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Environmental & Geological Engineering (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The invention discloses a production process of sintered building aggregate, which comprises the following steps: preparing raw materials, grinding industrial waste residues, homogenizing and aging, granulating and granulating, preparing fuel, calcining and sintering, cooling, screening and packaging; the invention utilizes shale, cinder, clay, mud and other raw materials to cooperate with the mineral such as the sintering formation composite aluminate and so on to form the high-strength compact building aggregate, the factory raw materials are close to the material selection range and can also digest the industrial waste residue, and the stacker-reclaimer is utilized to carry out the homogenization to the mixed materials by adopting the storage and material taking way of tiling and taking in the material aging process, which is more beneficial to the uniformity of the components of the raw materials, ensures the quality stability of the product, and simultaneously, directly presses the materials into the cylinder which is most suitable for the combination reaction with the cement in the concrete product to calcine, and is a finished product, which is beneficial to the increase of the strength of the concrete.
Description
Technical Field
The invention relates to the technical field of building aggregate production, in particular to a production process for sintering building aggregate.
Background
The concrete is prepared by mixing, pouring, tamping, coagulating and hardening cement as a cementing material, sandstone aggregate and water, wherein the sandstone aggregate accounts for 60-80% of the volume of the concrete, is the most basic raw material resource for engineering construction, and has the largest using amount, the sandstone mineral resources in China are rich, mainly small mining points are taken as main raw materials, the phenomena of excessive mining and random excavation are serious, the sandstone quality is uneven, the concentration ratio of aggregate enterprises is lower, along with the increase of the national supervision and control on the industry, the enhancement of environmental protection, the strict limitation on the exploitation of open-width mines, the contradiction between market supply and demand is increasingly prominent, the exploitation of artificial building aggregate replacing natural resources leads the development direction of the industry,
the sintered aggregate is mainly developed and utilized on a large scale, the raw materials are determined according to the resource conditions of different regions, in the prior art, mine resources are mostly adopted for preparation, the raw materials are greatly consumed, the environment is polluted, and the preparation quality is difficult to ensure, so that the artificial building aggregate is reasonably produced by utilizing industrial wastes to replace natural resources for mining and producing sandstone materials, the development of circular economy is met, the mining of the mine resources is reduced, and the aim of perfecting the urgent need is fulfilled.
Disclosure of Invention
In order to solve the problems, the invention aims to provide a production process of sintered building aggregate, which utilizes shale, coal cinder, clay, sludge and other raw materials to be matched with and sintered to generate composite aluminate and other minerals to form the high-strength compact building aggregate, has wide material selection range of factory raw materials, and can digest and treat industrial waste residues.
In order to realize the purpose of the invention, the invention is realized by the following technical scheme: a production process of sintered building aggregate comprises the following steps:
the method comprises the following steps: preparation of the starting materials
Respectively conveying the industrial waste residues to a field comprehensive shed for partitioned stockpiling, firstly air-drying, crushing by a back-impact crusher, conveying to a blending warehouse for storage for later use, respectively taking the clay and the sludge on the wasteland, piling and air-drying, crushing by a pair of roller crushers, and conveying to the blending warehouse for storage for later use;
step two: industrial waste residue powder mill
Analyzing chemical components of the industrial waste residue obtained in the step one, determining a batching proportion according to a result, respectively metering and conveying the industrial waste residue to a closed-circuit system consisting of an HRM type vertical roller mill and a combined powder concentrator through computer batching equipment for grinding, utilizing high-temperature waste gas at the tail of a rotary kiln for drying flue gas, and storing the ground material in a warehouse after grinding;
step three: homogenizing and aging
Adjusting and controlling the feeding of the clay and the sludge stored in the step one and the industrial waste residue material ground in the step two in proportion again through a quality control system, conveying the materials into a double-shaft stirrer through a rubber belt conveyor to be uniformly stirred, conveying the materials into a storage warehouse through a stacker-reclaimer to be layered, tiled and stacked, aging for 24-72 h, so that the organic matter components of the materials generate fermentation, the large-particle materials are loosened, the moisture is uniform, and then the materials are taken;
step four: granulating and pelletizing
Carrying out double-roller granulation on the stacked and aged materials by using a double-roller granulator to form cylindrical granules, controlling the diameter to be 10-50 mm and the column length to be 10-100 mm, and screening the formed granules to remove the granules with unqualified diameter and column length;
step five: preparation of fuel
Performing air swept type coal grinding on raw coal by adopting an MFB type drying and pulverizing mill, wherein the moisture content of the raw coal is less than or equal to 10 percent, and the particle size of the raw coal is less than or equal to 25 mm; after grinding, controlling the water content of the ground coal powder to be less than or equal to 1 percent and the screen residue of the coal powder with the fineness of 80m to be 2-6 percent, and then putting the prepared anthracite powder into a coal powder bin for storage and standby.
Step six: calcining and sintering
Conveying the qualified granules obtained in the fourth step into a rotary kiln from the kiln tail through a large-inclination-angle rubber belt conveyor, connecting a coal powder bin by using a multi-channel low-NOX coal powder burner to obtain fuel, calcining the granules in the rotary kiln, and synthesizing aggregate minerals from the qualified granules through drying, preheating, decomposing and calcining stages;
step seven: cooling down
Discharging the aggregate product in the high-temperature state prepared in the step six from a discharge hole of a rotary kiln, feeding the aggregate product into a grate cooler, rapidly cooling the aggregate product in the working state of carrying out heat exchange at a large air flow so as to crystallize compound salt and other glass bodies generated at a high temperature to form high-strength mineral aggregate, and feeding the cooled aggregate product into a screening device from an outlet of the cooler;
step eight: screen pack
Screening and grading the cooled aggregate product by a grading sieve device to obtain finished aggregate with corresponding specification according to the requirement of the building market, adding 5% of steel fiber into the finished aggregate, and packaging.
The further improvement lies in that: in the first step, shale and coal cinder are taken from industrial waste residues, wherein the shale is air-dried until the water content is less than or equal to 8 percent, and the crushed discharged particles are less than or equal to 15 mm; the crushed discharged particles of the coal cinder are less than or equal to 15 mm; and the clay and the sludge are air-dried until the water content is less than or equal to 8 percent and the broken particles are less than or equal to 1.5 mm.
The further improvement lies in that: in the first step, the chemical components of the prepared raw materials are changed within the range of SiO 248-60%, Al2O 312-20%, Fe2O 35-9%, CaO 3-10%, MgO 1-3%, K2O + Na2O 1-5% and loss on ignition 2-10%.
The further improvement lies in that: in the second step, the inlet temperature of the grinding is 400 ℃, when the granularity of the ground materials is less than or equal to 30mm and the moisture is less than or equal to 10 percent, the fineness of the ground materials is controlled to be less than or equal to 100 mu m, and the moisture is 0.5 percent.
The further improvement lies in that: and in the third step, the materials are vertically taken along the stacking section for homogenization during material taking, so that the components of the materials entering the kiln are uniform.
The further improvement lies in that: in the sixth step, the specific calcining process is as follows: the temperature gradient of the drying preheating zone is 150-650 ℃, the moisture of the aggregate grain blank is thoroughly dried and evaporated, the temperature is gradually increased to 650-950 ℃, the compounds in the material gradually start to decompose to form a free ion shape, the material is a high-temperature calcining zone when the temperature is increased to 950-1200 ℃, the material forms a molten glass fluid phase at the temperature, and the composite minerals such as aluminate and the like are generated and sintered to be compact to form the solid granular aggregate product.
The further improvement lies in that: and in the step eight, after screening, crushing the materials with the size of more than 50mm, and then screening again, wherein the materials with the size of less than 3mm are sold in the markets as mixed materials of cement plants and sand for buildings.
The invention has the beneficial effects that: firstly, shale, coal slag, clay, sludge and other raw materials are matched and sintered to generate mineral such as composite aluminate and the like to form high-strength compact building aggregate, so that factory raw materials are close to the material selection range and industrial waste residues can be digested;
secondly, in the material aging process, the stacker-reclaimer is used for pre-homogenizing the mixed material in a storage and reclaiming mode of flat laying and direct taking, so that the uniform components of the raw materials are more facilitated, and the stable quality of the product is ensured;
thirdly, directly pressing the materials into a cylinder which is most suitable for the combination reaction with cement in a concrete product for calcination, and obtaining a finished product at one time, which is beneficial to increasing the strength of concrete;
the rotary kiln is selected for calcination, the mechanical operation is reliable, a stable combustion temperature field exists, a stable thermal regulation system is formed by adding a DCS control system, the product quality is stable, the yield is high, the unit energy consumption is low, the application range to fuel is wide, the kiln tail waste gas is used for drying, crushing and grinding the raw material, and the energy consumption is further reduced;
the cooling system adopts a grate cooler, so that the heat exchange efficiency is high, the material cooling is fast, the power consumption is low, and the centralized use of waste gas and the environment-friendly treatment of tail gas are facilitated;
and sixthly, steel fibers are added, so that the toughness and the supporting performance of the building aggregate are further improved.
Drawings
FIG. 1 is a flow chart of the present invention.
Detailed Description
In order to further understand the present invention, the following detailed description will be made with reference to the following examples, which are only used for explaining the present invention and are not to be construed as limiting the scope of the present invention.
According to fig. 1, the present embodiment provides a process for producing a sintered building aggregate, comprising the steps of:
the method comprises the following steps: preparation of the starting materials
Taking industrial waste residues, respectively sending the industrial waste residues to a field comprehensive material shed for partitioned stockpiling, firstly air-drying, crushing by a back-impact crusher, and then conveying to a blending warehouse for storage for later use, wherein the industrial waste residues are shale and coal cinder, the shale is air-dried until the moisture content is less than or equal to 8%, and the crushed discharging particles are less than or equal to 15 mm; the crushed discharged particles of the coal cinder are less than or equal to 15 mm; then taking the clay and the sludge on the wasteland to respectively enter a field, stacking and air-drying until the moisture content is less than or equal to 8 percent, crushing by a double-roller crusher until the crushed particles are less than or equal to 1.5mm, and finally conveying to a blending warehouse for storage and standby; the raw materials comprise, by weight, 248-60% of SiO, 312-20% of Al2O, 35-9% of Fe2O, 3-10% of CaO, 1-3% of MgO, 1-5% of K2O + Na2O 1 and 2-10% of loss on ignition.
Step two: industrial waste residue powder mill
Analyzing chemical components of the industrial waste residue obtained in the step one, determining a batching proportion according to a result, respectively metering and conveying the industrial waste residue to a closed-circuit system consisting of an HRM type vertical roller mill and a combined powder concentrator through computer batching equipment for grinding, using high-temperature waste gas at the tail of a rotary kiln for drying flue gas, controlling the inlet temperature of grinding to be 400 ℃, controlling the fineness of the ground material to be less than or equal to 100 mu m and the water content to be 0.5% when the granularity of the ground material is less than or equal to 30mm and the water content is less than or equal to 10%, and storing the ground material in a warehouse after grinding;
step three: homogenizing and aging
The clay and sludge stored in the step one and the industrial waste residue materials ground in the step two are fed proportionally and controlled by a quality control system again, conveyed by a rubber belt conveyor to enter a double-shaft stirrer to be uniformly stirred, enter a storage tank through a stacker-reclaimer to be layered, laid and stacked, and aged for 50 hours, so that the organic substance components of the materials generate fermentation, large-particle materials are loosened, the moisture and the humidity are uniform, then the materials are taken, and the materials are vertically taken along the stacking section to be homogenized during the material taking, so that the components of the materials entering the kiln are uniform;
step four: granulating and pelletizing
Carrying out double-roller granulation on the stacked and aged materials by using a double-roller granulator to form cylindrical granules, controlling the diameter to be 10-50 mm and the column length to be 10-100 mm, and screening the formed granules to remove the granules with unqualified diameter and column length;
step five: preparation of fuel
Performing air swept type coal grinding on raw coal by adopting an MFB type drying and pulverizing mill, wherein the moisture content of the raw coal is less than or equal to 10 percent, and the particle size of the raw coal is less than or equal to 25 mm; after grinding, controlling the water content of the ground coal powder to be less than or equal to 1 percent and the screen residue of the coal powder with the fineness of 80m to be 4 percent, and then putting the prepared anthracite powder into a coal powder bin for storage and standby.
Step six: calcining and sintering
Conveying qualified granules obtained in the fourth step into a rotary kiln from the kiln tail through a large-inclination-angle rubber belt conveyor, connecting a coal powder bin by using a multi-channel and low-NOX coal powder burner to obtain fuel, calcining the granules in the rotary kiln, synthesizing aggregate minerals by drying, preheating, decomposing and calcining the qualified granules, wherein the temperature gradient of a drying and preheating zone is 500 ℃, the moisture of the aggregate granules is thoroughly dried and evaporated, the temperature is gradually increased to 800 ℃, compounds in the materials are gradually decomposed to form a free ion shape, and the high-temperature calcining zone is formed when the temperature is increased to 1100 ℃, so that the materials form a molten vitreous humour phase at the temperature, generate composite minerals such as aluminate and the like, and sinter and compact to form an aggregate product of solid particles;
step seven: cooling down
Discharging the aggregate product in the high-temperature state prepared in the step six from a discharge hole of a rotary kiln, feeding the aggregate product into a grate cooler, rapidly cooling the aggregate product in the working state of carrying out heat exchange at a large air flow so as to crystallize compound salt and other glass bodies generated at a high temperature to form high-strength mineral aggregate, and feeding the cooled aggregate product into a screening device from an outlet of the cooler;
step eight: screen pack
Screening and grading the cooled aggregate products by using grading sieve equipment, dividing the cooled aggregate products into products with different specifications of 3-10 mm, 10-25 mm, 25-40 mm and 40-50 mm to obtain finished aggregates with corresponding specifications according to the requirements of the building market, adding 5% of steel fibers into the finished aggregates, and then packaging, wherein the materials with the size of more than 50mm are crushed and then sieved again, and the materials with the size of less than 3mm are sold in the markets of cement plant mixed materials and building sands.
The production process of the sintered building aggregate comprises the following steps: firstly, shale, coal slag, clay, sludge and other raw materials are matched and sintered to generate mineral such as composite aluminate and the like to form high-strength compact building aggregate, so that factory raw materials are close to the material selection range and industrial waste residues can be digested;
secondly, in the material aging process, the stacker-reclaimer is used for pre-homogenizing the mixed material in a storage and reclaiming mode of flat laying and direct taking, so that the uniform components of the raw materials are more facilitated, and the stable quality of the product is ensured;
thirdly, directly pressing the materials into a cylinder which is most suitable for the combination reaction with cement in a concrete product for calcination, and obtaining a finished product at one time, which is beneficial to increasing the strength of concrete;
the rotary kiln is selected for calcination, the mechanical operation is reliable, a stable combustion temperature field exists, a stable thermal regulation system is formed by adding a DCS control system, the product quality is stable, the yield is high, the unit energy consumption is low, the application range to fuel is wide, the kiln tail waste gas is used for drying, crushing and grinding the raw material, and the energy consumption is further reduced;
the cooling system adopts a grate cooler, so that the heat exchange efficiency is high, the material cooling is fast, the power consumption is low, and the centralized use of waste gas and the environment-friendly treatment of tail gas are facilitated;
and sixthly, steel fibers are added, so that the toughness and the supporting performance of the building aggregate are further improved.
The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (7)
1. The production process of the sintered building aggregate is characterized by comprising the following steps of:
the method comprises the following steps: preparation of the starting materials
Respectively conveying the industrial waste residues to a field comprehensive shed for partitioned stockpiling, firstly air-drying, crushing by a back-impact crusher, conveying to a blending warehouse for storage for later use, respectively taking the clay and the sludge on the wasteland, piling and air-drying, crushing by a pair of roller crushers, and conveying to the blending warehouse for storage for later use;
step two: industrial waste residue powder mill
Analyzing chemical components of the industrial waste residue obtained in the step one, determining a batching proportion according to a result, respectively metering and conveying the industrial waste residue to a closed-circuit system consisting of an HRM type vertical roller mill and a combined powder concentrator through computer batching equipment for grinding, utilizing high-temperature waste gas at the tail of a rotary kiln for drying flue gas, and storing the ground material in a warehouse after grinding;
step three: homogenizing and aging
Adjusting and controlling the feeding of the clay and the sludge stored in the step one and the industrial waste residue material ground in the step two in proportion again through a quality control system, conveying the materials into a double-shaft stirrer through a rubber belt conveyor to be uniformly stirred, conveying the materials into a storage warehouse through a stacker-reclaimer to be layered, tiled and stacked, aging for 24-72 h, so that the organic matter components of the materials generate fermentation, the large-particle materials are loosened, the moisture is uniform, and then the materials are taken;
step four: granulating and pelletizing
Carrying out double-roller granulation on the stacked and aged materials by using a double-roller granulator to form cylindrical granules, controlling the diameter to be 10-50 mm and the column length to be 10-100 mm, and screening the formed granules to remove the granules with unqualified diameter and column length;
step five: preparation of fuel
Performing air swept type coal grinding on raw coal by adopting an MFB type drying and pulverizing mill, wherein the moisture content of the raw coal is less than or equal to 10 percent, and the particle size of the raw coal is less than or equal to 25 mm; after grinding, controlling the water content of the ground coal powder to be less than or equal to 1 percent and the screen residue of the coal powder with the fineness of 80m to be 2-6 percent, and then putting the prepared anthracite powder into a coal powder bin for storage and standby.
Step six: calcining and sintering
Conveying the qualified granules obtained in the fourth step into a rotary kiln from the kiln tail through a large-inclination-angle rubber belt conveyor, connecting a coal powder bin by using a multi-channel low-NOX coal powder burner to obtain fuel, calcining the granules in the rotary kiln, and synthesizing aggregate minerals from the qualified granules through drying, preheating, decomposing and calcining stages;
step seven: cooling down
Discharging the aggregate product in the high-temperature state prepared in the step six from a discharge hole of a rotary kiln, feeding the aggregate product into a grate cooler, rapidly cooling the aggregate product in the working state of carrying out heat exchange at a large air flow so as to crystallize compound salt and other glass bodies generated at a high temperature to form high-strength mineral aggregate, and feeding the cooled aggregate product into a screening device from an outlet of the cooler;
step eight: screen pack
Screening and grading the cooled aggregate product by a grading sieve device to obtain finished aggregate with corresponding specification according to the requirement of the building market, adding 5% of steel fiber into the finished aggregate, and packaging.
2. The process for producing sintered building aggregate according to claim 1, wherein: in the first step, shale and coal cinder are taken from industrial waste residues, wherein the shale is air-dried until the water content is less than or equal to 8 percent, and the crushed discharged particles are less than or equal to 15 mm; the crushed discharged particles of the coal cinder are less than or equal to 15 mm; and the clay and the sludge are air-dried until the water content is less than or equal to 8 percent and the broken particles are less than or equal to 1.5 mm.
3. The process for producing sintered building aggregate according to claim 1, wherein: in the first step, the chemical components of the prepared raw materials are changed within the range of SiO 248-60%, Al2O 312-20%, Fe2O 35-9%, CaO 3-10%, MgO 1-3%, K2O + Na2O 1-5% and loss on ignition 2-10%.
4. The process for producing sintered building aggregate according to claim 1, wherein: in the second step, the inlet temperature of the grinding is 400 ℃, when the granularity of the ground materials is less than or equal to 30mm and the moisture is less than or equal to 10 percent, the fineness of the ground materials is controlled to be less than or equal to 100 mu m, and the moisture is 0.5 percent.
5. The process for producing sintered building aggregate according to claim 1, wherein: and in the third step, the materials are vertically taken along the stacking section for homogenization during material taking, so that the components of the materials entering the kiln are uniform.
6. The process for producing sintered building aggregate according to claim 1, wherein: in the sixth step, the specific calcining process is as follows: the temperature gradient of the drying preheating zone is 150-650 ℃, the moisture of the aggregate grain blank is thoroughly dried and evaporated, the temperature is gradually increased to 650-950 ℃, the compounds in the material gradually start to decompose to form a free ion shape, the material is a high-temperature calcining zone when the temperature is increased to 950-1200 ℃, the material forms a molten glass fluid phase at the temperature, and the composite minerals such as aluminate and the like are generated and sintered to be compact to form the solid granular aggregate product.
7. The process for producing sintered building aggregate according to claim 1, wherein: and in the step eight, after screening, crushing the materials with the size of more than 50mm, and then screening again, wherein the materials with the size of less than 3mm are sold in the markets as mixed materials of cement plants and sand for buildings.
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| CN105753352A (en) * | 2016-01-25 | 2016-07-13 | 李国安 | Technique for producing building aggregate with industrial waste residues as supporting material |
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| CN105753352A (en) * | 2016-01-25 | 2016-07-13 | 李国安 | Technique for producing building aggregate with industrial waste residues as supporting material |
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Application publication date: 20200904 |