CN116715507A - Method for preparing baked brick by roasting river sludge at high temperature - Google Patents
Method for preparing baked brick by roasting river sludge at high temperature Download PDFInfo
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- CN116715507A CN116715507A CN202310419940.3A CN202310419940A CN116715507A CN 116715507 A CN116715507 A CN 116715507A CN 202310419940 A CN202310419940 A CN 202310419940A CN 116715507 A CN116715507 A CN 116715507A
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- 239000010802 sludge Substances 0.000 title claims abstract description 114
- 239000011449 brick Substances 0.000 title claims abstract description 41
- 238000000034 method Methods 0.000 title claims abstract description 28
- 238000000855 fermentation Methods 0.000 claims abstract description 72
- 230000004151 fermentation Effects 0.000 claims abstract description 72
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 50
- 239000011268 mixed slurry Substances 0.000 claims abstract description 42
- 230000001954 sterilising effect Effects 0.000 claims abstract description 41
- 238000003756 stirring Methods 0.000 claims abstract description 35
- 238000002156 mixing Methods 0.000 claims abstract description 33
- 238000010304 firing Methods 0.000 claims abstract description 29
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 claims abstract description 18
- 229910052750 molybdenum Inorganic materials 0.000 claims abstract description 18
- 239000011733 molybdenum Substances 0.000 claims abstract description 18
- 208000005156 Dehydration Diseases 0.000 claims abstract description 17
- 238000000748 compression moulding Methods 0.000 claims abstract description 17
- 230000018044 dehydration Effects 0.000 claims abstract description 17
- 238000006297 dehydration reaction Methods 0.000 claims abstract description 17
- 239000010881 fly ash Substances 0.000 claims abstract description 17
- 238000001035 drying Methods 0.000 claims abstract description 9
- 241000894006 Bacteria Species 0.000 claims description 60
- 238000004659 sterilization and disinfection Methods 0.000 claims description 24
- 241000194108 Bacillus licheniformis Species 0.000 claims description 16
- WQZGKKKJIJFFOK-GASJEMHNSA-N Glucose Natural products OC[C@H]1OC(O)[C@H](O)[C@@H](O)[C@@H]1O WQZGKKKJIJFFOK-GASJEMHNSA-N 0.000 claims description 16
- 240000000249 Morus alba Species 0.000 claims description 16
- 235000008708 Morus alba Nutrition 0.000 claims description 16
- 241000235342 Saccharomycetes Species 0.000 claims description 16
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 16
- 235000015278 beef Nutrition 0.000 claims description 16
- 239000008103 glucose Substances 0.000 claims description 16
- 230000001546 nitrifying effect Effects 0.000 claims description 16
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims description 15
- 229910052698 phosphorus Inorganic materials 0.000 claims description 15
- 239000011574 phosphorus Substances 0.000 claims description 15
- 244000063299 Bacillus subtilis Species 0.000 claims description 14
- 235000014469 Bacillus subtilis Nutrition 0.000 claims description 14
- 240000008042 Zea mays Species 0.000 claims description 14
- 235000007244 Zea mays Nutrition 0.000 claims description 14
- 229940089639 cornsilk Drugs 0.000 claims description 14
- 239000001231 zea mays silk Substances 0.000 claims description 14
- 238000002360 preparation method Methods 0.000 claims description 9
- 239000000463 material Substances 0.000 claims description 8
- 238000004537 pulping Methods 0.000 claims description 8
- 238000004519 manufacturing process Methods 0.000 claims 3
- 230000000052 comparative effect Effects 0.000 description 7
- 239000011451 fired brick Substances 0.000 description 4
- 238000010521 absorption reaction Methods 0.000 description 3
- 230000007547 defect Effects 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 239000002910 solid waste Substances 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000005416 organic matter Substances 0.000 description 1
- 230000008520 organization Effects 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
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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
- 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
- C04B33/1324—Recycled material, e.g. tile dust, stone waste, spent refractory material
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/02—Biological treatment
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/121—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering
- C02F11/127—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering by centrifugation
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/18—Treatment of sludge; Devices therefor by thermal conditioning
- C02F11/185—Treatment of sludge; Devices therefor by thermal conditioning by pasteurisation
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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
- 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
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- 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
- C04B33/135—Combustion residues, e.g. fly ash, incineration waste
- C04B33/1352—Fuel ashes, e.g. fly ash
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/007—Contaminated open waterways, rivers, lakes or ponds
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- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
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- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/65—Aspects relating to heat treatments of ceramic bodies such as green ceramics or pre-sintered ceramics, e.g. burning, sintering or melting processes
- C04B2235/656—Aspects relating to heat treatments of ceramic bodies such as green ceramics or pre-sintered ceramics, e.g. burning, sintering or melting processes characterised by specific heating conditions during heat treatment
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- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/65—Aspects relating to heat treatments of ceramic bodies such as green ceramics or pre-sintered ceramics, e.g. burning, sintering or melting processes
- C04B2235/656—Aspects relating to heat treatments of ceramic bodies such as green ceramics or pre-sintered ceramics, e.g. burning, sintering or melting processes characterised by specific heating conditions during heat treatment
- C04B2235/6567—Treatment time
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- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
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- C04B2235/96—Properties of ceramic products, e.g. mechanical properties such as strength, toughness, wear resistance
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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
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- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
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- Treatment Of Sludge (AREA)
Abstract
The invention relates to the technical field of baked bricks, and discloses a method for preparing a baked brick by baking river sludge at a high temperature, which comprises the following steps: (1) first, subjecting sludge to a dehydration treatment; (2) Adding fermentation liquor into the sludge, uniformly stirring, and carrying out constant-temperature fermentation treatment; (3) sterilizing the sludge; (4) Sequentially adding the sludge, the molybdenum tailings, the fly ash and the shale into a stirrer for uniformly mixing and stirring, adding water, and continuously stirring to obtain mixed slurry; (5) Adding the mixed slurry into a mould, performing compression molding, demolding, drying and firing to obtain a finished product; according to the invention, through the treatment of the river sludge, not only can the fineness of the river sludge be reduced, but also the binding power of the river sludge can be improved, and the binding power of the river sludge can be improved, so that the binding performance between the river sludge and other components is tighter.
Description
Technical Field
The invention relates to the technical field of baked bricks, in particular to a method for preparing a baked brick by baking river sludge at a high temperature.
Background
The river course, lake, river and other places need to be dredged regularly, a large amount of sludge can be produced in the dredging process, and a large amount of sludge is produced to occupy a large amount of places for accumulation.
Thus, the treatment of sludge is a problem that currently needs to be solved.
The prior art, application number is: 201610683672.6 the invention discloses a river mud firing water-retaining water permeable brick and a preparation method thereof, and the river mud firing water-retaining water permeable brick is mainly prepared from the following raw materials in percentage by mass: 30-50% of sludge, 40-60% of shale, 5-10% of waste ceramsite and 5-10% of pore-forming agent. The river mud firing water-retaining water permeable brick has good water retention and permeability, can achieve certain performance indexes, overcomes the defects of low strength, durability and high repair rate of the existing water-retaining water permeable brick, simultaneously realizes the additional value utilization of solid waste mud, solves the problems that the solid waste mud pollutes the environment and a large amount of piles occupy cultivated land after dredging, has objective economic benefit and application value, and treats the river mud by preparing the ceramsite from the river mud, but the performance of a product is greatly reduced and cannot guarantee the application performance because the river mud is directly used.
Based on the above, we propose a method for preparing a baked brick by roasting river sludge at high temperature, which is hopeful to solve the defects in the prior art.
Disclosure of Invention
(one) solving the technical problems
Aiming at the defects of the prior art, the invention provides a method for preparing a baked brick by roasting river sludge at a high temperature.
(II) technical scheme
In order to achieve the above purpose, the present invention provides the following technical solutions:
a method for preparing a baked brick by roasting river sludge at a high temperature comprises the following steps:
(1) Firstly, dehydrating the sludge, wherein the water content of the sludge to be treated is lower than 12%, and stopping dehydration;
(2) Adding fermentation liquor into the sludge, uniformly stirring, and carrying out constant-temperature fermentation treatment for 5-8 days;
(3) Sterilizing the sludge after fermentation treatment;
(4) Sequentially adding sterilized sludge, molybdenum tailings, fly ash and shale into a stirrer, uniformly mixing and stirring, adding water according to a water-material ratio of 0.1-0.2, and continuously stirring for 1-1.5 hours to obtain mixed slurry;
(5) Adding the mixed slurry into a mould, performing compression molding, demolding, drying and firing to obtain a finished product.
As a further technical scheme, the dehydration treatment of the sludge is as follows:
centrifuging at 5000r/min for 1 hr at 40deg.C;
and then, carrying out centrifugal treatment at 8000r/min under the environment of 45 ℃ until the water content of the sludge is lower than 12%, and stopping.
As a further technical scheme, the preparation method of the fermentation broth comprises the following steps:
sequentially adding mulberry leaves, glucose, beef extract, diatomite, corn silk and water into a stirrer, uniformly stirring, pulping to obtain mixed slurry, and sterilizing the mixed slurry;
inoculating 10% of fermentation bacteria into the mixed slurry, and then carrying out constant-temperature fermentation treatment for 4-5 hours to obtain a required fermentation liquor;
wherein the temperature of constant temperature fermentation treatment is 35 ℃.
As a further technical scheme: the mixing mass ratio of the mulberry leaves to the glucose to the beef extract to the diatomite to the corn silk to the water is 12-16:3:8:1:2-4:40.
As a further technical scheme: the sterilization treatment adopts steam sterilization treatment;
wherein the steam sterilization temperature is 121 ℃.
As a further technical scheme, the zymophyte comprises nitrifying bacteria, vulcanizing bacteria, bacillus subtilis, bacillus licheniformis, saccharomycetes and phosphorus accumulating bacteria;
wherein the mixing mass ratio of nitrifying bacteria, vulcanizing bacteria, bacillus subtilis, bacillus licheniformis, saccharomycetes and phosphorus accumulating bacteria is 3:5:8:4-6:2:1.
As a further technical scheme, the mixing mass ratio of the sludge, the molybdenum tailings, the fly ash and the shale is 30-35:10-13:20-28:30-40.
As a further technical scheme: the pressure during the compression molding is 22MPa;
the dwell time was 35s.
As a further technical scheme: the firing temperature is 1050 ℃;
firing time was 4h.
According to the invention, the organic matter content of the river sludge can be increased by fermenting the river sludge, so that the solidification effect of the river sludge is greatly improved, and the durability and the stability of the river sludge are greatly improved.
The untreated river sludge can cause larger quality loss in the firing process, and the organization structure of the fired green bricks is loose, so that the mechanical properties, especially the compressive strength and the flexural strength of the fired green bricks are obviously reduced, and the application of the ceramic green bricks is limited.
The fineness of the river sludge after treatment is finer. The water content is lower, the pores inside the green bricks can be filled more fully, the compactness of the tissue structure is improved, and the comprehensive mechanical property of the fired brick can be improved. However, excessive addition of river sludge can cause the structure of the green bricks to become loose again, and can reduce the mechanical properties of the fired bricks.
(III) beneficial effects
Compared with the prior art, the invention provides a method for preparing a baked brick by roasting river sludge at a high temperature, which has the following beneficial effects:
according to the invention, through the treatment of the river sludge, not only can the fineness of the river sludge be reduced, but also the binding power of the river sludge can be improved, and the binding power of the river sludge is improved, so that the binding performance between the river sludge and other components is tighter, and the whole baked brick is promoted to have better mechanical properties.
According to the invention, by adding the molybdenum tailings, the strength of the baked brick can be improved, and the evaporation efficiency of water in the green brick can be improved, so that the phenomenon of cracking in the green brick baking process can be effectively avoided, and the performance of the baked brick is ensured.
The invention adopts river sludge to prepare the baked brick, has large consumption, can effectively solve the disposal problem of a large amount of river sludge, fully realizes the recycling, improves the utilization rate of resources, and has higher economic benefit.
Detailed Description
The technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The following are specific examples:
example 1
A method for preparing a baked brick by roasting river sludge at a high temperature comprises the following steps:
(1) Firstly, dehydrating the sludge, wherein the water content of the sludge to be treated is lower than 12%, and stopping dehydration; the dehydration treatment of the sludge is as follows:
centrifuging at 5000r/min for 1 hr at 40deg.C;
and then, carrying out centrifugal treatment at 8000r/min under the environment of 45 ℃ until the water content of the sludge is lower than 12%, and stopping.
(2) Adding fermentation liquor into the sludge, uniformly stirring, and carrying out constant-temperature fermentation treatment for 5 days; the preparation method of the fermentation broth comprises the following steps:
sequentially adding mulberry leaves, glucose, beef extract, diatomite, corn silk and water into a stirrer, uniformly stirring, pulping to obtain mixed slurry, and sterilizing the mixed slurry;
inoculating 10% of fermentation bacteria into the mixed slurry, and then carrying out constant-temperature fermentation treatment for 4 hours to obtain a required fermentation liquor;
wherein the temperature of constant temperature fermentation treatment is 35 ℃.
The mixing mass ratio of the mulberry leaves to the glucose to the beef extract to the diatomite to the corn silk to the water is 12:3:8:1:2:40.
The fermentation bacteria include nitrifying bacteria, vulcanizing bacteria, bacillus subtilis, bacillus licheniformis, saccharomycetes and phosphorus accumulating bacteria;
wherein the mixing mass ratio of nitrifying bacteria, vulcanizing bacteria, bacillus subtilis, bacillus licheniformis, saccharomycetes and phosphorus accumulating bacteria is 3:5:8:4:2:1.
(3) Sterilizing the sludge after fermentation treatment; the sterilization treatment adopts steam sterilization treatment;
wherein the steam sterilization temperature is 121 ℃.
(4) Sequentially adding sterilized sludge, molybdenum tailings, fly ash and shale into a stirrer, uniformly mixing and stirring, adding water according to a water-material ratio of 0.1, and continuously stirring for 1 hour to obtain mixed slurry; the mixing mass ratio of the sludge, the molybdenum tailings, the fly ash and the shale is 30:10:20:30.
(5) Adding the mixed slurry into a mould, performing compression molding, demolding, drying and firing to obtain a finished product. The pressure during compression molding is 22MPa; the dwell time is 35s, and the firing temperature is 1050 ℃; firing time was 4h.
Example 2
A method for preparing a baked brick by roasting river sludge at a high temperature comprises the following steps:
(1) Firstly, dehydrating the sludge, wherein the water content of the sludge to be treated is lower than 12%, and stopping dehydration; the dehydration treatment of the sludge is as follows:
centrifuging at 5000r/min for 1 hr at 40deg.C;
and then, carrying out centrifugal treatment at 8000r/min under the environment of 45 ℃ until the water content of the sludge is lower than 12%, and stopping.
(2) Adding fermentation liquor into the sludge, uniformly stirring, and carrying out constant-temperature fermentation treatment for 6 days; the preparation method of the fermentation broth comprises the following steps:
sequentially adding mulberry leaves, glucose, beef extract, diatomite, corn silk and water into a stirrer, uniformly stirring, pulping to obtain mixed slurry, and sterilizing the mixed slurry;
inoculating 10% of fermentation bacteria by mass into the mixed slurry, and then carrying out constant-temperature fermentation treatment for 4.5 hours to obtain a required fermentation liquor;
wherein the temperature of constant temperature fermentation treatment is 35 ℃.
The mixing mass ratio of the mulberry leaves to the glucose to the beef extract to the diatomite to the corn silk to the water is 14:3:8:1:2.5:40.
The fermentation bacteria include nitrifying bacteria, vulcanizing bacteria, bacillus subtilis, bacillus licheniformis, saccharomycetes and phosphorus accumulating bacteria;
wherein the mixing mass ratio of nitrifying bacteria, vulcanizing bacteria, bacillus subtilis, bacillus licheniformis, saccharomycetes and phosphorus accumulating bacteria is 3:5:8:4.5:2:1.
(3) Sterilizing the sludge after fermentation treatment; the sterilization treatment adopts steam sterilization treatment;
wherein the steam sterilization temperature is 121 ℃.
(4) Sequentially adding sterilized sludge, molybdenum tailings, fly ash and shale into a stirrer, uniformly mixing and stirring, adding water according to a water-material ratio of 0.12, and continuously stirring for 1.2 hours to obtain mixed slurry; the mixing mass ratio of the sludge, the molybdenum tailings, the fly ash and the shale is 31:11:25:35.
(5) Adding the mixed slurry into a mould, performing compression molding, demolding, drying and firing to obtain a finished product. The pressure during compression molding is 22MPa; the dwell time is 35s, and the firing temperature is 1050 ℃; firing time was 4h.
Example 3
A method for preparing a baked brick by roasting river sludge at a high temperature comprises the following steps:
(1) Firstly, dehydrating the sludge, wherein the water content of the sludge to be treated is lower than 12%, and stopping dehydration; the dehydration treatment of the sludge is as follows:
centrifuging at 5000r/min for 1 hr at 40deg.C;
and then, carrying out centrifugal treatment at 8000r/min under the environment of 45 ℃ until the water content of the sludge is lower than 12%, and stopping.
(2) Adding fermentation liquor into the sludge, uniformly stirring, and carrying out constant-temperature fermentation treatment for 7 days; the preparation method of the fermentation broth comprises the following steps:
sequentially adding mulberry leaves, glucose, beef extract, diatomite, corn silk and water into a stirrer, uniformly stirring, pulping to obtain mixed slurry, and sterilizing the mixed slurry;
inoculating 10% of fermentation bacteria by mass into the mixed slurry, and then carrying out constant-temperature fermentation treatment for 4.5 hours to obtain a required fermentation liquor;
wherein the temperature of constant temperature fermentation treatment is 35 ℃.
The mixing mass ratio of the mulberry leaves to the glucose to the beef extract to the diatomite to the corn silk to the water is 15:3:8:1:3:40.
The fermentation bacteria include nitrifying bacteria, vulcanizing bacteria, bacillus subtilis, bacillus licheniformis, saccharomycetes and phosphorus accumulating bacteria;
wherein the mixing mass ratio of nitrifying bacteria, vulcanizing bacteria, bacillus subtilis, bacillus licheniformis, saccharomycetes and phosphorus accumulating bacteria is 3:5:8:5:2:1.
(3) Sterilizing the sludge after fermentation treatment; the sterilization treatment adopts steam sterilization treatment;
wherein the steam sterilization temperature is 121 ℃.
(4) Sequentially adding sterilized sludge, molybdenum tailings, fly ash and shale into a stirrer, uniformly mixing and stirring, adding water according to a water-material ratio of 0.15, and continuously stirring for 1.2 hours to obtain mixed slurry; the mixing mass ratio of the sludge, the molybdenum tailings, the fly ash and the shale is 33:12:25:38.
(5) Adding the mixed slurry into a mould, performing compression molding, demolding, drying and firing to obtain a finished product. The pressure during compression molding is 22MPa; the dwell time is 35s, and the firing temperature is 1050 ℃; firing time was 4h.
Example 4
A method for preparing a baked brick by roasting river sludge at a high temperature comprises the following steps:
(1) Firstly, dehydrating the sludge, wherein the water content of the sludge to be treated is lower than 12%, and stopping dehydration; the dehydration treatment of the sludge is as follows:
centrifuging at 5000r/min for 1 hr at 40deg.C;
and then, carrying out centrifugal treatment at 8000r/min under the environment of 45 ℃ until the water content of the sludge is lower than 12%, and stopping.
(2) Adding fermentation liquor into the sludge, uniformly stirring, and carrying out constant-temperature fermentation treatment for 8 days; the preparation method of the fermentation broth comprises the following steps:
sequentially adding mulberry leaves, glucose, beef extract, diatomite, corn silk and water into a stirrer, uniformly stirring, pulping to obtain mixed slurry, and sterilizing the mixed slurry;
inoculating 10% of fermentation bacteria by mass into the mixed slurry, and then carrying out constant-temperature fermentation treatment for 5 hours to obtain a required fermentation liquor;
wherein the temperature of constant temperature fermentation treatment is 35 ℃.
The mixing mass ratio of the mulberry leaves to the glucose to the beef extract to the diatomite to the corn silk to the water is 16:3:8:1:4:40.
The fermentation bacteria include nitrifying bacteria, vulcanizing bacteria, bacillus subtilis, bacillus licheniformis, saccharomycetes and phosphorus accumulating bacteria;
wherein the mixing mass ratio of nitrifying bacteria, vulcanizing bacteria, bacillus subtilis, bacillus licheniformis, saccharomycetes and phosphorus accumulating bacteria is 3:5:8:6:2:1.
(3) Sterilizing the sludge after fermentation treatment; the sterilization treatment adopts steam sterilization treatment;
wherein the steam sterilization temperature is 121 ℃.
(4) Sequentially adding sterilized sludge, molybdenum tailings, fly ash and shale into a stirrer, uniformly mixing and stirring, adding water according to a water-material ratio of 0.2, and continuously stirring for 1.5 hours to obtain mixed slurry; the mixing mass ratio of the sludge, the molybdenum tailings, the fly ash and the shale is 35:13:28:40.
(5) Adding the mixed slurry into a mould, performing compression molding, demolding, drying and firing to obtain a finished product. The pressure during compression molding is 22MPa; the dwell time is 35s, and the firing temperature is 1050 ℃; firing time was 4h.
Comparative example 1:
a method for preparing a baked brick by roasting river sludge at a high temperature comprises the following steps:
(1) Firstly, dehydrating the sludge, wherein the water content of the sludge to be treated is lower than 12%, and stopping dehydration; the dehydration treatment of the sludge is as follows:
centrifuging at 5000r/min for 1 hr at 40deg.C;
and then, carrying out centrifugal treatment at 8000r/min under the environment of 45 ℃ until the water content of the sludge is lower than 12%, and stopping.
(2) Adding fermentation liquor into the sludge, uniformly stirring, and carrying out constant-temperature fermentation treatment for 7 days; the preparation method of the fermentation broth comprises the following steps:
sequentially adding mulberry leaves, glucose, beef extract, diatomite and water into a stirrer, uniformly stirring, pulping to obtain mixed slurry, and sterilizing the mixed slurry;
inoculating 10% of fermentation bacteria by mass into the mixed slurry, and then carrying out constant-temperature fermentation treatment for 4.5 hours to obtain a required fermentation liquor;
wherein the temperature of constant temperature fermentation treatment is 35 ℃.
The mixing mass ratio of the mulberry leaves to the glucose to the beef extract to the diatomite to the water is 15:3:8:1:40.
The fermentation bacteria include nitrifying bacteria, vulcanizing bacteria, bacillus subtilis, bacillus licheniformis, saccharomycetes and phosphorus accumulating bacteria;
wherein the mixing mass ratio of nitrifying bacteria, vulcanizing bacteria, bacillus subtilis, bacillus licheniformis, saccharomycetes and phosphorus accumulating bacteria is 3:5:8:5:2:1.
(3) Sterilizing the sludge after fermentation treatment; the sterilization treatment adopts steam sterilization treatment;
wherein the steam sterilization temperature is 121 ℃.
(4) Sequentially adding sterilized sludge, molybdenum tailings, fly ash and shale into a stirrer, uniformly mixing and stirring, adding water according to a water-material ratio of 0.15, and continuously stirring for 1.2 hours to obtain mixed slurry; the mixing mass ratio of the sludge, the molybdenum tailings, the fly ash and the shale is 33:12:25:38.
(5) Adding the mixed slurry into a mould, performing compression molding, demolding, drying and firing to obtain a finished product. The pressure during compression molding is 22MPa; the dwell time is 35s, and the firing temperature is 1050 ℃; firing time was 4h.
Comparative example 2:
a method for preparing a baked brick by roasting river sludge at a high temperature comprises the following steps:
(1) Firstly, dehydrating the sludge, wherein the water content of the sludge to be treated is lower than 12%, and stopping dehydration; the dehydration treatment of the sludge is as follows:
centrifuging at 5000r/min for 1 hr at 40deg.C;
and then, carrying out centrifugal treatment at 8000r/min under the environment of 45 ℃ until the water content of the sludge is lower than 12%, and stopping.
(2) Adding fermentation liquor into the sludge, uniformly stirring, and carrying out constant-temperature fermentation treatment for 7 days; the preparation method of the fermentation broth comprises the following steps:
sequentially adding mulberry leaves, glucose, beef extract, diatomite, corn silk and water into a stirrer, uniformly stirring, pulping to obtain mixed slurry, and sterilizing the mixed slurry;
inoculating 10% of fermentation bacteria by mass into the mixed slurry, and then carrying out constant-temperature fermentation treatment for 4.5 hours to obtain a required fermentation liquor;
wherein the temperature of constant temperature fermentation treatment is 35 ℃.
The mixing mass ratio of the mulberry leaves to the glucose to the beef extract to the diatomite to the corn silk to the water is 15:3:8:1:3:40.
The zymophyte comprises nitrifying bacteria, bacillus licheniformis, saccharomycetes and phosphorus accumulating bacteria;
wherein the mixing mass ratio of nitrifying bacteria to bacillus licheniformis to saccharomycetes to polyphosphoric bacteria is 3:5:2:1.
(3) Sterilizing the sludge after fermentation treatment; the sterilization treatment adopts steam sterilization treatment;
wherein the steam sterilization temperature is 121 ℃.
(4) Sequentially adding sterilized sludge, molybdenum tailings, fly ash and shale into a stirrer, uniformly mixing and stirring, adding water according to a water-material ratio of 0.15, and continuously stirring for 1.2 hours to obtain mixed slurry; the mixing mass ratio of the sludge, the molybdenum tailings, the fly ash and the shale is 33:12:25:38.
(5) Adding the mixed slurry into a mould, performing compression molding, demolding, drying and firing to obtain a finished product. The pressure during compression molding is 22MPa; the dwell time is 35s, and the firing temperature is 1050 ℃; firing time was 4h.
And (3) testing:
the water absorption of the bricks prepared by the examples and the comparative examples with the same specification is detected and compared, and the method is carried out according to GB/T2542-2012:
TABLE 1
| Water absorption percentage% | |
| Example 1 | 7.68 |
| Example 2 | 7.61 |
| Example 3 | 7.57 |
| Example 4 | 7.69 |
| Comparative example 1 | 8.87 |
| Comparative example 2 | 8.04 |
As can be seen from Table 1, the fired brick produced by the method of the present invention has a lower water absorption.
Compressive strength detection, reference GB/T2542-2012, comparison:
TABLE 2
| Compressive strength MPa | |
| Example 1 | 25.3 |
| Example 2 | 25.8 |
| Example 3 | 26.1 |
| Example 4 | 25.7 |
| Comparative example 1 | 22.4 |
| Comparative example 2 | 20.8 |
As can be seen from Table 2, the compressive strength of the fired brick fired by the method of the present invention was greatly improved.
Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (9)
1. The method for preparing the baked brick by roasting the river sludge at high temperature is characterized by comprising the following steps of:
(1) Firstly, dehydrating the sludge, wherein the water content of the sludge to be treated is lower than 12%, and stopping dehydration;
(2) Adding fermentation liquor into the sludge, uniformly stirring, and carrying out constant-temperature fermentation treatment for 5-8 days;
(3) Sterilizing the sludge after fermentation treatment;
(4) Sequentially adding sterilized sludge, molybdenum tailings, fly ash and shale into a stirrer, uniformly mixing and stirring, adding water according to a water-material ratio of 0.1-0.2, and continuously stirring for 1-1.5 hours to obtain mixed slurry;
(5) Adding the mixed slurry into a mould, performing compression molding, demolding, drying and firing to obtain a finished product.
2. The method for preparing a baked brick by baking river sludge at high temperature according to claim 1, wherein the dehydration treatment of the sludge is as follows:
centrifuging at 5000r/min for 1 hr at 40deg.C;
and then, carrying out centrifugal treatment at 8000r/min under the environment of 45 ℃ until the water content of the sludge is lower than 12%, and stopping.
3. The method for preparing a baked brick by using high-temperature baked river sludge according to claim 1, wherein the preparation method of the fermentation broth is as follows:
sequentially adding mulberry leaves, glucose, beef extract, diatomite, corn silk and water into a stirrer, uniformly stirring, pulping to obtain mixed slurry, and sterilizing the mixed slurry;
inoculating 10% of fermentation bacteria into the mixed slurry, and then carrying out constant-temperature fermentation treatment for 4-5 hours to obtain a required fermentation liquor;
wherein the temperature of constant temperature fermentation treatment is 35 ℃.
4. A method for producing a baked brick using high temperature roasted river sludge as claimed in claim 3, wherein: the mixing mass ratio of the mulberry leaves to the glucose to the beef extract to the diatomite to the corn silk to the water is 12-16:3:8:1:2-4:40.
5. A method for producing a baked brick using high temperature roasted river sludge as claimed in claim 3, wherein: the sterilization treatment adopts steam sterilization treatment;
wherein the steam sterilization temperature is 121 ℃.
6. A method for producing a baked brick using high temperature roasted river sludge as claimed in claim 3, wherein the fermentation bacteria include nitrifying bacteria, sulfidizing bacteria, bacillus subtilis, bacillus licheniformis, saccharomycetes and phosphorus accumulating bacteria;
wherein the mixing mass ratio of nitrifying bacteria, vulcanizing bacteria, bacillus subtilis, bacillus licheniformis, saccharomycetes and phosphorus accumulating bacteria is 3:5:8:4-6:2:1.
7. The method for preparing the baked brick by using the high-temperature baked river sludge, which is characterized in that the mixing mass ratio of the sludge, the molybdenum tailings, the fly ash and the shale is (30-35:10-13): 20-28:30-40.
8. The method for preparing a baked brick by baking river sludge at high temperature according to claim 1, wherein the method comprises the following steps: the pressure during the compression molding is 22MPa;
the dwell time was 35s.
9. The method for preparing a baked brick by baking river sludge at high temperature according to claim 1, wherein the method comprises the following steps: the firing temperature is 1050 ℃;
firing time was 4h.
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