CN111303957A - Biomass fuel based on fly ash and sludge, and preparation method and application thereof - Google Patents
Biomass fuel based on fly ash and sludge, and preparation method and application thereof Download PDFInfo
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- CN111303957A CN111303957A CN202010270853.2A CN202010270853A CN111303957A CN 111303957 A CN111303957 A CN 111303957A CN 202010270853 A CN202010270853 A CN 202010270853A CN 111303957 A CN111303957 A CN 111303957A
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
- C10L5/00—Solid fuels
- C10L5/40—Solid fuels essentially based on materials of non-mineral origin
- C10L5/46—Solid fuels essentially based on materials of non-mineral origin on sewage, house, or town refuse
-
- 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
- C04B33/00—Clay-wares
- C04B33/02—Preparing or treating the raw materials individually or as batches
- C04B33/04—Clay; Kaolin
-
- 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
- C04B33/00—Clay-wares
- C04B33/02—Preparing or treating the raw materials individually or as batches
- C04B33/13—Compounding ingredients
- C04B33/132—Waste materials; Refuse; Residues
- C04B33/1321—Waste slurries, e.g. harbour sludge, industrial muds
-
- 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
- C04B33/00—Clay-wares
- C04B33/32—Burning methods
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
- C10L5/00—Solid fuels
- C10L5/40—Solid fuels essentially based on materials of non-mineral origin
- C10L5/48—Solid fuels essentially based on materials of non-mineral origin on industrial residues and waste materials
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
- C10L2290/00—Fuel preparation or upgrading, processes or apparatus therefore, comprising specific process steps or apparatus units
- C10L2290/24—Mixing, stirring of fuel components
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
- C10L2290/00—Fuel preparation or upgrading, processes or apparatus therefore, comprising specific process steps or apparatus units
- C10L2290/26—Composting, fermenting or anaerobic digestion fuel components or materials from which fuels are prepared
-
- 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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E50/00—Technologies for the production of fuel of non-fossil origin
- Y02E50/10—Biofuels, e.g. bio-diesel
-
- 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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E50/00—Technologies for the production of fuel of non-fossil origin
- Y02E50/30—Fuel from waste, e.g. synthetic alcohol or diesel
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/60—Production of ceramic materials or ceramic elements, e.g. substitution of clay or shale by alternative raw materials, e.g. ashes
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Organic Chemistry (AREA)
- Dispersion Chemistry (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Environmental & Geological Engineering (AREA)
- Processing Of Solid Wastes (AREA)
- Solid Fuels And Fuel-Associated Substances (AREA)
Abstract
The invention discloses a biomass fuel based on fly ash and sludge, a preparation method and application thereof, and belongs to the technical field of sludge treatment and resource utilization. The method comprises the steps of mixing and stirring the fly ash and the sludge until the water content of the mixture reaches 45-55%, then carrying out stacking aerobic fermentation, when the fermentation temperature is increased to 50-65 ℃, alternately turning the stack for 4-6 times, and when the water content is reduced to 5-15%, preparing the biomass fuel based on the fly ash and the sludge. The shale sintered brick prepared by mixing the biomass fuel, the shale powder, the coal powder and the water can reduce 15% of shale (clay) usage and 50% of coal powder usage, so that the usage amount of coal powder and shale (clay) resources is reduced for shale brick and tile factories, and the prepared shale sintered brick meets the national standard. Meanwhile, the production cost of cement manufacturing enterprises is reduced, and the cement prepared by using the cement as a raw material also meets the national standard.
Description
Technical Field
The invention belongs to the technical field of sludge treatment and resource utilization, and particularly relates to a biomass fuel based on fly ash and sludge as well as a preparation method and application thereof.
Background
Coal is used as main energy in China, and the total demand is still large. Shale (clay) baked bricks are one of the main wall materials in the building industry in China, and the shale (clay) bricks need a large amount of coal resources to be baked, so that coal gangue with low calorific value is fully utilized.
Therefore, how to fully utilize the fly ash and the sludge to convert the fly ash and the sludge into recyclable substances,
reducing the demand of shale (clay) baked bricks on coal has become an important issue to be solved urgently.
Disclosure of Invention
The invention aims to provide a biomass fuel based on fly ash and sludge, a preparation method and application thereof, aiming at the defects of the prior art. The method reduces the usage amount of coal powder and shale (clay) resources in shale brick and tile factories and reduces the production cost of cement manufacturing enterprises while solving the problems of sludge and coal ash.
The technical scheme of the invention is as follows:
in a first aspect, the invention provides a preparation method of biomass fuel based on fly ash and sludge, comprising the following steps:
mixing and stirring the fly ash and the sludge until the water content of the mixture reaches 45-55% to obtain a first mixed material;
and (3) stacking the first mixed material for aerobic fermentation, and when the fermentation temperature is increased to 50-65 ℃, turning the stack for 4-6 times at intervals, and reducing the water content to 5-15% to prepare the biomass fuel based on the fly ash and the sludge.
Further, the water content of the sludge is 75% -95%.
Further, the sludge comprises at least one of municipal domestic sludge, industrial sludge for removing hazardous waste, paper making sludge, printing and dyeing textile sludge and traditional Chinese medicine sludge.
Further, in the step of stacking the first mixed material for aerobic fermentation, adding a biological strain or an enzyme preparation for fermentation, wherein the mass ratio of the biological strain or the enzyme preparation to the sludge is 1: 2000.
further, the biological strain comprises at least one of bacillus, yeast and lactic acid bacteria.
Further, the enzyme preparation is a protease or a cellulase.
In a second aspect, the invention provides a biomass fuel based on fly ash and sludge obtained by the preparation method.
Further, the biomass fuel based on the fly ash and the sludge has a basic low calorific value of 1200Kcal/Kg to 1800 Kcal/Kg.
In a third aspect, the invention provides application of biomass fuel based on fly ash and sludge in preparation of a shale sintered brick, wherein the biomass fuel based on fly ash and sludge is mixed with shale powder, coal powder and water, and the shale sintered brick is obtained through stirring, brick blank making and sintering.
In a fourth aspect, the invention provides an application of biomass fuel based on fly ash and sludge in preparing cement, wherein the biomass fuel based on fly ash and sludge is added in preparing the cement, and the prepared cement is prepared from the following raw materials in parts by weight: 45-55 parts of cement clinker, 10-20 parts of slag, 2-4 parts of biomass fuel based on fly ash and sludge, 3-5 parts of fly ash, 10-15 parts of limestone, 5-10 parts of gypsum and 2-4 parts of yellow sand.
The invention has the following beneficial effects:
1. compared with the prior art of sintering wall materials by sludge treatment, the invention reduces the water content, peculiar smell, heavy metal, germs and worm eggs of the sludge by the method of aerobic fermentation of the fly ash and the urban domestic sludge, and leads the sludge to reach the standard of GB/T25031-2010 sludge for treating sludge and making bricks in urban sewage treatment plants.
2. According to the invention, the shale baked brick prepared by mixing the biomass fuel based on the fly ash and the sludge with the shale powder, the coal powder and the water can be used for replacing the coal powder due to the heat value of the shale baked brick, so that the coal powder consumption can be reduced by 50%, and the shale (clay) consumption can be reduced by 15%; the using amount of coal dust and shale (clay) resources and the operation cost of enterprises are reduced for shale brickyard.
3. The shale sintered brick prepared by the invention has a calorific value due to the biomass fuel, so that the weight of the shale sintered brick is lightened by about 10% compared with that of the traditional shale sintered brick after sintering, and the shale sintered brick is beneficial to reducing the whole weight of a house.
4. The biomass fuel prepared by the invention is used for preparing cement, can reduce the using amount of fly ash, is beneficial to comprehensive utilization of resources and environmental protection, and is also beneficial to reducing the production cost of cement manufacturing enterprises.
5. The invention comprehensively utilizes the fly ash and the sludge in a recycling, harmless, reducing and stabilizing way, solves a great environmental problem, and has very obvious economic benefit, social benefit and environmental protection benefit.
Detailed Description
The technical solution of the present invention is further described below with reference to specific examples, but the present invention is not limited to the contents of the examples in any way.
Example 1
Mixing and stirring the fly ash and the urban domestic sludge with the water content of 75% until the water content of the mixture reaches 45% to obtain a first mixed material, stacking the first mixed material for aerobic fermentation, and turning the first mixed material for 4 times at intervals when the fermentation temperature is increased to 50 ℃, so as to prepare the biomass fuel when the water content of the first mixed material is reduced to 10%.
Example 2
Mixing and stirring the fly ash and the industrial sludge with the water content of 85% except the hazardous wastes until the water content of the mixture reaches 45% to obtain a first mixed material, then stacking the first mixed material for aerobic fermentation, and turning the first mixed material for 4 times at intervals when the fermentation temperature is increased to 50 ℃, and preparing the biomass fuel when the water content of the first mixed material is reduced to 5%.
Example 3
Mixing and stirring the fly ash and the papermaking sludge with the water content of 95% until the water content of the mixture reaches 55% to obtain a first mixed material, stacking the first mixed material for aerobic fermentation, and turning the first mixed material for 5 times at intervals when the fermentation temperature is raised to 55 ℃, so that the biomass fuel is prepared when the water content of the first mixed material is reduced to 10%.
Example 4
Mixing and stirring the fly ash and the printing and dyeing textile sludge with the water content of 75% until the water content of the mixture reaches 55% to obtain a first mixed material, stacking the first mixed material for aerobic fermentation, and turning the first mixed material for 6 times at intervals when the fermentation temperature is raised to 65 ℃, so that the biomass fuel is prepared when the water content of the first mixed material is reduced to 15%.
Example 5
Mixing and stirring the fly ash and the traditional Chinese medicine sludge with the water content of 80% until the water content of the mixture reaches 45% to obtain a first mixed material, then carrying out stacking aerobic fermentation on the first mixed material, adding bacillus in the fermentation process, wherein the mass ratio of the bacillus to the traditional Chinese medicine sludge is 1: 2000, when the fermentation temperature is raised to 60 ℃, turning the pile for 5 times at intervals, and when the water content of the first mixed material is reduced to 15%, preparing the biomass fuel.
Example 6
Mixing and stirring the fly ash and the urban domestic sludge with the water content of 75% until the water content of the mixture reaches 55% to obtain a first mixed material, then carrying out stacking aerobic fermentation on the first mixed material, adding saccharomycetes in the fermentation process, wherein the mass ratio of the saccharomycetes to the urban domestic sludge is 1: 2000, when the fermentation temperature is increased to 65 ℃, turning the pile for 6 times at intervals, and when the water content of the first mixed material is reduced to 10%, preparing the biomass fuel.
Example 7
Mixing and stirring the fly ash and the papermaking sludge with the water content of 80% until the water content of the mixture reaches 55% to obtain a first mixed material, then carrying out stacking aerobic fermentation on the first mixed material, adding lactic acid bacteria in the fermentation process, wherein the mass ratio of the lactic acid bacteria to the papermaking sludge is 1: 2000, when the fermentation temperature is increased to 65 ℃, turning the pile for 6 times at intervals, and when the water content of the first mixed material is reduced to 15%, preparing the biomass fuel.
Example 8
Mixing and stirring the fly ash and the printing and dyeing textile sludge with the water content of 90% until the water content of the mixture reaches 50% to obtain a first mixed material, then carrying out stacking aerobic fermentation on the first mixed material, adding protease in the fermentation process, wherein the mass ratio of the protease to the printing and dyeing textile sludge is 1: 2000, when the fermentation temperature is increased to 55 ℃, turning the pile for 4 times at intervals, and when the water content of the first mixed material is reduced to 5%, preparing the biomass fuel.
Example 9
Mixing and stirring the fly ash and the traditional Chinese medicine sludge with the water content of 95% until the water content of the mixture reaches 55% to obtain a first mixed material, then carrying out stacking aerobic fermentation on the first mixed material, and adding cellulase in the fermentation process, wherein the mass ratio of the cellulase to the traditional Chinese medicine sludge is 1: 2000, when the fermentation temperature is increased to 65 ℃, turning the pile for 6 times at intervals, and when the water content of the first mixed material is reduced to 10%, preparing the biomass fuel.
The prepared biomass fuel has a basic low calorific value of 1200Kcal/Kg-1800 Kcal/Kg.
The shale sintered brick prepared by mixing the biomass fuel prepared by the invention with shale powder, coal powder and water through stirring, brick making and sintering meets the national standard, and the preparation method is carried out according to the conventional operation.
The biomass fuel based on the fly ash and the sludge prepared by the invention is used for preparing cement, replaces part of fly ash raw materials in the original cement preparation, and is partially applied as follows:
applications 1
The cement clinker aggregate is prepared from the following raw materials in parts by weight, wherein the raw materials comprise 45 parts of cement clinker, 20 parts of slag, 4 parts of biomass fuel based on fly ash and sludge, 3 parts of fly ash, 15 parts of limestone, 10 parts of gypsum and 4 parts of yellow sand. Firstly, crushing and mixing cement clinker, slag, biomass fuel based on fly ash and sludge, fly ash, gypsum and yellow sand according to the parts, and then mixing the crushed materials with limestone which is crushed separately to prepare cement.
Application 2
The cement clinker aggregate is prepared from 55 parts by weight of cement clinker, 15 parts by weight of slag, 3 parts by weight of biomass fuel based on fly ash and sludge, 5 parts by weight of fly ash, 10 parts by weight of limestone, 8 parts by weight of gypsum and 3 parts by weight of yellow sand. Firstly, crushing and mixing cement clinker, slag, biomass fuel based on fly ash and sludge, fly ash, gypsum and yellow sand according to the parts, and then mixing the crushed materials with limestone which is crushed separately to prepare cement.
Application 3
The cement clinker aggregate is prepared from 50 parts by weight of cement clinker, 18 parts by weight of slag, 2 parts by weight of biomass fuel based on fly ash and sludge, 4 parts by weight of fly ash, 12 parts by weight of limestone, 5 parts by weight of gypsum and 2 parts by weight of yellow sand. Firstly, crushing and mixing cement clinker, slag, biomass fuel based on fly ash and sludge, fly ash, gypsum and yellow sand according to the parts, and then mixing the crushed materials with limestone which is crushed separately to prepare cement.
The cement prepared by the biomass fuel prepared by the method meets the national standard, the preparation method is simple, the working hours are reduced, the energy is saved, and the cost is reduced.
Although the present invention has been described herein with reference to the illustrated embodiments thereof, which are intended to be preferred embodiments of the present invention, it is to be understood that the invention is not limited thereto, and that numerous other modifications and embodiments can be devised by those skilled in the art that will fall within the spirit and scope of the principles of this disclosure.
Claims (10)
1. The preparation method of the biomass fuel based on the fly ash and the sludge is characterized by comprising the following steps:
mixing and stirring the fly ash and the sludge until the water content of the mixture reaches 45-55% to obtain a first mixed material;
and (3) stacking the first mixed material for aerobic fermentation, and when the fermentation temperature is increased to 50-65 ℃, turning the stack for 4-6 times at intervals, and reducing the water content to 5-15% to prepare the biomass fuel based on the fly ash and the sludge.
2. The method for preparing the biomass fuel based on the fly ash and the sludge as claimed in claim 1, wherein the water content of the sludge is 75-95%.
3. The method for preparing biomass fuel based on fly ash and sludge according to claim 1, wherein the sludge comprises at least one of municipal sludge, industrial sludge for removing hazardous waste, paper sludge, textile printing sludge, and traditional Chinese medicine sludge.
4. The method for preparing the biomass fuel based on the fly ash and the sludge as claimed in claim 1, wherein in the step of stacking the first mixed material for aerobic fermentation, a biological strain or an enzyme preparation is added for fermentation, and the mass ratio of the biological strain or the enzyme preparation to the sludge is 1: 2000.
5. the method of claim 4, wherein the biological species includes at least one of bacillus, yeast, and lactic acid bacteria.
6. The method for preparing a biomass fuel based on fly ash and sludge according to claim 4, wherein the enzyme preparation is protease or cellulase.
7. A fly ash and sludge-based biomass fuel obtained by the production method according to any one of claims 1 to 6.
8. The fly ash and sludge based biomass fuel of claim 7, wherein the fly ash and sludge based biomass fuel receives a calorific value of 1200Kcal/Kg to 1800 Kcal/Kg.
9. The application of the biomass fuel based on the fly ash and the sludge in the preparation of the shale sintered brick as claimed in claim 7, wherein the biomass fuel based on the fly ash and the sludge is mixed with shale powder, coal powder and water, and then is stirred, made into a green brick and sintered to obtain the shale sintered brick.
10. The application of the biomass fuel based on the fly ash and the sludge in the preparation of cement as claimed in claim 7, wherein the biomass fuel based on the fly ash and the sludge is added during the preparation of cement, and the prepared cement is prepared from the following raw materials in parts by weight: 45-55 parts of cement clinker, 10-20 parts of slag, 2-4 parts of biomass fuel based on fly ash and sludge, 3-5 parts of fly ash, 10-15 parts of limestone, 5-10 parts of gypsum and 2-4 parts of yellow sand.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2020101662438 | 2020-03-11 | ||
| CN202010166243 | 2020-03-11 |
Publications (1)
| Publication Number | Publication Date |
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| CN111303957A true CN111303957A (en) | 2020-06-19 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
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| CN202010270853.2A Pending CN111303957A (en) | 2020-03-11 | 2020-04-08 | Biomass fuel based on fly ash and sludge, and preparation method and application thereof |
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| CN (1) | CN111303957A (en) |
Cited By (2)
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| CN112906218A (en) * | 2021-02-07 | 2021-06-04 | 浙江和惠生态环境科技有限公司 | Compatibility method, control system, equipment and storage medium for high-temperature melting treatment of fly ash |
| CN116715507A (en) * | 2023-04-19 | 2023-09-08 | 安徽龙钰徽派古建工艺制品有限公司 | Method for preparing baked brick by roasting river sludge at high temperature |
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| CN112906218A (en) * | 2021-02-07 | 2021-06-04 | 浙江和惠生态环境科技有限公司 | Compatibility method, control system, equipment and storage medium for high-temperature melting treatment of fly ash |
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| CN116715507A (en) * | 2023-04-19 | 2023-09-08 | 安徽龙钰徽派古建工艺制品有限公司 | Method for preparing baked brick by roasting river sludge at high temperature |
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