CN113831108A - Method for preparing light ceramsite by using machine-made sand sludge - Google Patents
Method for preparing light ceramsite by using machine-made sand sludge Download PDFInfo
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- CN113831108A CN113831108A CN202111158826.7A CN202111158826A CN113831108A CN 113831108 A CN113831108 A CN 113831108A CN 202111158826 A CN202111158826 A CN 202111158826A CN 113831108 A CN113831108 A CN 113831108A
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- 239000010802 sludge Substances 0.000 title claims abstract description 45
- 239000004576 sand Substances 0.000 title claims abstract description 40
- 238000000034 method Methods 0.000 title claims abstract description 22
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 17
- 239000011230 binding agent Substances 0.000 claims abstract description 10
- 239000004927 clay Substances 0.000 claims abstract description 8
- 239000000463 material Substances 0.000 claims abstract description 8
- 239000000203 mixture Substances 0.000 claims abstract description 3
- 238000003825 pressing Methods 0.000 claims abstract description 3
- 238000002156 mixing Methods 0.000 claims abstract 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 14
- 239000002245 particle Substances 0.000 claims description 12
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 claims description 8
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 claims description 6
- DPXJVFZANSGRMM-UHFFFAOYSA-N acetic acid;2,3,4,5,6-pentahydroxyhexanal;sodium Chemical compound [Na].CC(O)=O.OCC(O)C(O)C(O)C(O)C=O DPXJVFZANSGRMM-UHFFFAOYSA-N 0.000 claims description 6
- 239000001768 carboxy methyl cellulose Substances 0.000 claims description 6
- 235000019812 sodium carboxymethyl cellulose Nutrition 0.000 claims description 6
- 229920001027 sodium carboxymethylcellulose Polymers 0.000 claims description 6
- 239000010440 gypsum Substances 0.000 claims description 5
- 229910052602 gypsum Inorganic materials 0.000 claims description 5
- 239000004484 Briquette Substances 0.000 claims description 3
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 claims description 3
- 239000010452 phosphate Substances 0.000 claims description 3
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 claims description 3
- 239000011734 sodium Substances 0.000 claims description 3
- 229910052708 sodium Inorganic materials 0.000 claims description 3
- 239000011780 sodium chloride Substances 0.000 claims description 3
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 claims description 2
- 229910000162 sodium phosphate Inorganic materials 0.000 claims description 2
- 229910052938 sodium sulfate Inorganic materials 0.000 claims description 2
- 235000011152 sodium sulphate Nutrition 0.000 claims description 2
- 238000001354 calcination Methods 0.000 claims 2
- 230000004907 flux Effects 0.000 claims 2
- 238000011085 pressure filtration Methods 0.000 claims 1
- 239000002994 raw material Substances 0.000 abstract description 5
- 239000002910 solid waste Substances 0.000 abstract description 4
- 238000004898 kneading Methods 0.000 abstract description 3
- 239000002699 waste material Substances 0.000 abstract description 3
- 238000011084 recovery Methods 0.000 abstract 1
- 238000010521 absorption reaction Methods 0.000 description 6
- 238000001816 cooling Methods 0.000 description 6
- 239000000843 powder Substances 0.000 description 6
- 230000002285 radioactive effect Effects 0.000 description 6
- 238000005406 washing Methods 0.000 description 6
- 238000009835 boiling Methods 0.000 description 5
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 4
- CSNNHWWHGAXBCP-UHFFFAOYSA-L Magnesium sulfate Chemical compound [Mg+2].[O-][S+2]([O-])([O-])[O-] CSNNHWWHGAXBCP-UHFFFAOYSA-L 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 239000011148 porous material Substances 0.000 description 4
- 239000004111 Potassium silicate Substances 0.000 description 3
- 239000011449 brick Substances 0.000 description 3
- 239000004566 building material Substances 0.000 description 3
- 229910052913 potassium silicate Inorganic materials 0.000 description 3
- NNHHDJVEYQHLHG-UHFFFAOYSA-N potassium silicate Chemical compound [K+].[K+].[O-][Si]([O-])=O NNHHDJVEYQHLHG-UHFFFAOYSA-N 0.000 description 3
- 235000019353 potassium silicate Nutrition 0.000 description 3
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 description 2
- 239000004567 concrete Substances 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 238000005469 granulation Methods 0.000 description 2
- 230000003179 granulation Effects 0.000 description 2
- 229910052943 magnesium sulfate Inorganic materials 0.000 description 2
- 235000019341 magnesium sulphate Nutrition 0.000 description 2
- 244000005700 microbiome Species 0.000 description 2
- PHIQPXBZDGYJOG-UHFFFAOYSA-N sodium silicate nonahydrate Chemical compound O.O.O.O.O.O.O.O.O.[Na+].[Na+].[O-][Si]([O-])=O PHIQPXBZDGYJOG-UHFFFAOYSA-N 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 239000012798 spherical particle Substances 0.000 description 2
- CYPRMUMKDSHJER-UHFFFAOYSA-N O.O.O.O.O.O.O.O.O.[Na] Chemical compound O.O.O.O.O.O.O.O.O.[Na] CYPRMUMKDSHJER-UHFFFAOYSA-N 0.000 description 1
- 229910019142 PO4 Inorganic materials 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000002802 bituminous coal Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- -1 light plate Substances 0.000 description 1
- 239000010813 municipal solid waste Substances 0.000 description 1
- 239000005416 organic matter Substances 0.000 description 1
- 230000001007 puffing effect Effects 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 239000004575 stone 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
- C04B33/131—Inorganic additives
-
- 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
- C04B33/1305—Organic additives
-
- 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
- C04B33/02—Preparing or treating the raw materials individually or as batches
- C04B33/13—Compounding ingredients
- C04B33/132—Waste materials; Refuse; Residues
- C04B33/1328—Waste materials; Refuse; Residues without additional clay
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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
- C04B33/32—Burning methods
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- C04B38/00—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof
- C04B38/02—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof by adding chemical blowing agents
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- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
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- C04B38/00—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof
- C04B38/06—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof by burning-out added substances by burning natural expanding materials or by sublimating or melting out added substances
- C04B38/063—Preparing or treating the raw materials individually or as batches
- C04B38/0635—Compounding ingredients
- C04B38/0645—Burnable, meltable, sublimable materials
- C04B38/0665—Waste material; Refuse other than vegetable refuse
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- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/34—Non-metal oxides, non-metal mixed oxides, or salts thereof that form the non-metal oxides upon heating, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3427—Silicates other than clay, e.g. water glass
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- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/44—Metal salt constituents or additives chosen for the nature of the anions, e.g. hydrides or acetylacetonate
- C04B2235/447—Phosphates or phosphites, e.g. orthophosphate or hypophosphite
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- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/44—Metal salt constituents or additives chosen for the nature of the anions, e.g. hydrides or acetylacetonate
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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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- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
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- Treatment Of Sludge (AREA)
Abstract
The invention discloses a method for preparing light ceramsite by using machine-made sand sludge, which comprises the steps of mixing and reacting the machine-made sand sludge after filter pressing with a pore-forming agent, a fluxing agent and a binder according to a certain mass percentage, putting the mixture into a kneading machine for kneading uniformly, and then granulating, preheating and roasting the kneaded material to obtain the light ceramsite with the apparent density of 300kg/m3～1000 kg/m3The light ceramsite. The invention uses the machine-made sand sludge as the main raw material to prepare the light ceramsite in a large proportion, and the comprehensive performance of the ceramsite is equivalent to or even better than that of the ceramsite prepared by adopting natural clay and shale. Realize the recovery of solid waste garbageThe method has the advantages of utilizing and changing waste into valuable, dredging the way of sludge treatment of machine-made sand factories, solving the problem of raw material source of the light ceramsite and having good social and economic benefits.
Description
Technical Field
The invention belongs to the technical field of building materials, and particularly relates to a method for preparing light ceramsite by using machine-made sand sludge.
Background
The sand stone for construction is a key raw material for constructing a concrete framework, and is a bulk building material product which consumes numerous natural resources. The annual output of the sandstone in China is as high as 200 hundred million tons, and the sandstone is the largest sandstone producing country and consumer country in the world. With the trend of the tight resource constraints of natural gravels and the increasing enhancement of environmental protection, machine-made gravels gradually become the main source of gravels for construction in China. However, in the production process of machine-made sand, about 10% of machine-made sand sludge is generated, and the sludge is difficult to be used for planting due to process characteristics. Part machine-made sand factories utilize the sludge to produce solid bricks, but the consumption is small due to the limitation of quality and use scenes, and the solid bricks are difficult to be digested in large quantity. With the implementation of new solid waste method in 9/1/2020, the treatment of machine-made sand sludge becomes a difficult problem for manufacturers.
The common light haydite is produced with clay, sea mud, shale and other material and through high temperature roasting and puffing, and has the features of low density, high strength, high water absorption, heat insulation, fire resistance, shock resistance, etc. it is ideal material for producing light aggregate concrete and green building material, such as light plate, brick, etc. and is used widely in green building. However, as the national constraint on natural resources is tightened and the environmental protection is increasingly enhanced, the shale has more and more restrictions on the mass production of ceramsite by using natural clay.
Although the light ceramsite is prepared by using machine-made sand sludge at present, the using amount of the light ceramsite is small, for example, Chinese patent 202110574252.5 discloses a method for firing the light ceramsite by using river sludge and machine-made sand tail sludge, the method mainly depends on that the river sludge is subjected to pore forming by using self-fermented microorganisms and organic matters so as to generate pores of the ceramsite and prepare a light material, and the river sludge needs to be decomposed river sludge which is similar to sea sludge widely applied to ceramsite production at present, and can also be used as a pore forming agent instead of the river sludge, and the principle is the same. Therefore, the amount of the tailing mud cannot be obtained in a considerable proportion, and actually the tailing mud is generally river sludge: tailings mud = 1: 1 is ideal, but in fact, the river pollution of the rotten river does not form a threat at present, and because of a large amount of microorganisms and organic matters, the organic matter is widely applied to pore-forming of light heat-insulating materials and is in short supply. The purpose of pore forming is achieved by adding a small amount of chemical reagents by using a mechanical sand sludge chemical reaction mode, and a method for further preparing the light ceramsite is reported in the current production.
Disclosure of Invention
Aiming at the problems in the prior art, the invention aims to provide the method for preparing the light ceramsite by utilizing the machine-made sand sludge, which realizes the recycling of solid waste and garbage, changes waste into valuable and has good economic benefit.
The invention is realized by the following technical scheme:
the method for preparing the light ceramsite by using the machine-made sand sludge is characterized in that the press-filtered machine-made sand sludge, a pore-forming agent, a fluxing agent and a binder are mixed and reacted according to a certain mass percentage, the mixture is put into a kneader to be kneaded uniformly, and then the kneaded material is granulated, preheated and roasted to obtain the light ceramsite with the apparent density of 300kg/m3～1000 kg/m3The light ceramsite.
Further, the certain mass percentage comprises 60-90% of machine-made sand sludge, 0.5-10% of pore-forming agent, 5-20% of fluxing agent and 0.5-10% of binder in terms of dry basis.
Further, the pore-forming agent is at least one of silicate, gypsum and domestic sludge.
Further, the fluxing agent is at least one of sodium chloride, sulfate and phosphate.
Furthermore, the binder is at least one of sodium carboxymethylcellulose, a briquette binder, sodium humate and clay, the machine-made sand sludge is easy to crack in a rotary kiln after granulation due to low clay components, and the addition of the binder is beneficial to enhancing the toughness and the cohesiveness of a finished granulation product.
Furthermore, the particle sizes of the pore-forming agent and the fluxing agent are 60-300 meshes.
Further, the water content of the machine-made sand sludge after filter pressing is 12-25%.
Further, after the kneaded material is granulated into balls, the balls enter a rotary kiln for roasting, wherein the roasting end temperature of the rotary kiln is 1100-1190 ℃, the tail temperature is less than 350 ℃, the rotating speed is 3-4 r/min, the time is about 100min, the total length of the rotary kiln is 35m, the diameter of a high-temperature section at the temperature of not less than 600 ℃ is 1m, the length of the high-temperature section is 17.5m, the diameter of a low-temperature section at the temperature of not less than 600 ℃ is 0.8m, and the length of the low-temperature section is 17.5 m.
The invention uses the machine-made sand sludge as the main raw material to prepare the light ceramsite in a large proportion, and the comprehensive performance of the ceramsite is equivalent to or even better than that of the ceramsite prepared by adopting natural clay and shale. The solid waste is recycled, waste is changed into valuable, the way of sludge treatment of machine-made sand factories is dredged, the problem of raw material source of the light ceramsite is solved, and the method has good social and economic benefits.
Detailed Description
The present invention will be described in further detail with reference to specific examples, which are provided for illustration only and are not intended to limit the invention.
Example 1
Adding 65% of machine-made sand sludge with the water content of 19% into a kneader according to the dry basis mass percentage, adding 5% of gypsum, 20% of sodium nonahydrate and 10% of clay, starting the kneader to knead for 50min, granulating into cylindrical particles with the diameter of 1.0cm and the length of about 3cm, conveying the cylindrical particles into a rotary kiln by using a conveying belt to roast, roasting the rotary kiln at the final temperature of 1100-1190 ℃ at the rotating speed of 3-4 r/min for about 100min, and naturally cooling to obtain the finished product of the light ceramsite.
The ceramsite prepared by the example absorbs waterThe rate is 12.3%, the cylinder pressure strength is 1.15MPa, and the bulk density is 420kg/m3The contents of sulfide and sulfate were 0.4%, the boiling mass loss was 2.2%, the contents of sludge and clod were 0.8%, the clod content was 0.1%, the radioactive internal irradiation index was 0.4, and the external irradiation index was 0.8.
Example 2
Adding 80% of machine-made sand sludge with the water content of 17% into a kneader according to the dry basis mass percentage, adding 5% of gypsum, 10% of sodium silicate nonahydrate, 3% of magnesium sulfate and 2% of briquette adhesive, starting the kneader to knead for 50min, granulating into cylindrical particles with the diameter of 1.0cm and the length of about 3cm, conveying the cylindrical particles into a rotary kiln by using a conveying belt to roast, roasting the rotary kiln at the final temperature of 1100-1190 ℃ at the rotating speed of 3-4 r/min for about 100min, and naturally cooling to obtain the finished product of the light ceramsite.
The ceramsite prepared by the example has the water absorption of 12.1 percent, the cylinder pressure strength of 1.2MPa and the bulk density of 450kg/m3The contents of sulfide and sulfate were 0.4%, the boiling mass loss was 2.0%, the contents of sludge and clod were 0.8%, the clod content was 0.1%, the radioactive internal irradiation index was 0.3, and the external irradiation index was 0.8.
Example 3
Putting 85% of sand washing mud and powder with the water content of 21% into a kneader according to the dry basis mass percentage, adding 1% of sodium carboxymethylcellulose, 6% of potassium silicate, 5% of domestic sludge and 3% of sodium humate, starting the kneader to knead for 50min, granulating into cylindrical particles with the diameter of 1.0cm and the length of about 3cm, conveying the cylindrical particles into a rotary kiln by using a conveyor belt to roast, roasting the rotary kiln at the final temperature of 1100-1190 ℃ at the rotating speed of 3-4 r/min for about 100min, and naturally cooling to obtain the finished product of the light ceramsite.
The ceramsite prepared by the example has the water absorption of 8 percent, the cylinder pressure strength of 2.0MPa and the bulk density of 650kg/m3Sulfide and sulfate content<0.01%, chloride content<0.01 percent, 2.2 percent of boiling mass loss, 0.6 percent of mud content and mud block content, 0.1 percent of mud block content, 0.2 percent of radioactive internal irradiation index and 0.6 percent of external irradiation index.
Example 4
And putting 90% of sand washing mud and powder with the water content of 21% into a kneader according to the dry basis mass percentage, adding 1% of bituminous coal, 6% of potassium silicate, 2% of phosphate and 1% of sodium carboxymethylcellulose, starting the kneader to knead for 50min, granulating into cylindrical particles with the diameter of 1.0cm and the length of about 3cm, conveying the cylindrical particles into a rotary kiln by using a conveying belt to roast, roasting the rotary kiln at the final temperature of 1100-1190 ℃ at the rotating speed of 3-4 r/min for about 100min, and naturally cooling to obtain the finished product of the light ceramsite.
The ceramsite prepared by the example has the water absorption of 8 percent, the cylinder pressure strength of 1.7MPa and the bulk density of 520kg/m3Sulfide and sulfate content<0.01%, chloride content<0.01 percent, 2.2 percent of boiling mass loss, 0.6 percent of mud content and mud block content, 0.1 percent of mud block content, 0.2 percent of radioactive internal irradiation index and 0.6 percent of external irradiation index.
Example 5
Taking 90% of sand washing mud and powder with the water content of 18% according to the dry basis weight percentage, putting the sand washing mud and the powder into a kneader, adding 1% of gypsum, 5% of potassium silicate, 3% of sodium chloride and 1% of sodium carboxymethylcellulose, starting the kneader, kneading for 50min, granulating into cylindrical particles with the diameter of 1.0cm and the length of about 3cm, conveying the cylindrical particles into a rotary kiln by using a conveying belt, roasting at the rotary kiln roasting end temperature of 1100-1190 ℃, rotating at the rotating speed of 3-4 r/min for about 100min, and naturally cooling to obtain the finished product of the light ceramsite.
The ceramsite prepared by the example has the water absorption of 8 percent, the cylinder pressure strength of 1.4MPa and the bulk density of 480kg/m3Sulfide and sulfate contents 0.4%, chloride contents<0.01 percent, boiling mass loss of 1.8 percent, mud content and mud block content of 0.8 percent, mud block content of 0.1 percent, radioactive internal irradiation index of 0.4 and external irradiation index of 0.7.
Example 6
Adding 90% of sand washing mud and powder with the water content of 17% into a kneader according to the dry basis mass percentage, adding 1% of coal gangue, 5% of sodium silicate nonahydrate, 3% of magnesium sulfate and 1% of sodium carboxymethylcellulose, starting the kneader to knead for 45min, granulating into spherical particles with the diameter of 1.8cm, sending the spherical particles into a rotary kiln to roast by using a conveyor belt after balling, wherein the roasting temperature is 1100-1190 ℃, the tail temperature is less than 350 ℃, the rotation speed of the roasting kiln is 3-4 r/min, the diameter of a sintering section is 1m, the length is 17.5m, the diameter of a preheating section is 0.8m, the length is 17.5m, the total duration is 100min, and naturally cooling to obtain the sand washing mud and powder.
The ceramsite prepared by the example has a water absorption of 9Percent, cylinder pressure strength 2.5MPa, bulk density 700kg/m3Sulfide and sulfate contents 0.1%, chloride contents<0.01 percent, the mud content and the mud block content are 0.6 percent, the mud block content is 0.1 percent, the radioactive internal irradiation index is 0.4, and the external irradiation index is 0.8.
Claims (8)
1. A method for preparing light ceramsite by using machine-made sand sludge is characterized in that the method comprises the steps of mixing and reacting the machine-made sand sludge after filter pressing with a pore-forming agent, a fluxing agent and a binder according to a certain mass percentage, putting the mixture into a kneader to be kneaded uniformly, and then granulating, preheating and roasting the kneaded material to obtain the light ceramsite with the apparent density of 300kg/m3～1000 kg/m3The light ceramsite.
2. The method for preparing light-weight ceramsite according to claim 1, wherein the certain mass percentage comprises 60% -90% of the machine-made sand sludge, 0.5% -10% of pore-forming agent, 5% -20% of fluxing agent and 0.5% -10% of binder on a dry basis.
3. The method for preparing light-weight ceramsite by using machine-made sand sludge as claimed in claim 1 or 2, wherein the pore-forming agent is at least one of silicate, gypsum and domestic sludge.
4. The method for preparing light-weight ceramsite according to claim 1 or 2, wherein the flux is at least one of sodium chloride, sulfate and phosphate.
5. The method for preparing light ceramsite by using machine-made sand sludge as claimed in claim 1 or 2, wherein the binder is at least one of sodium carboxymethylcellulose, a briquette binder, sodium humate and clay.
6. The method for preparing light ceramsite by using machine-made sand sludge as claimed in claim 1 or 2, wherein the particle size of the pore-forming agent and the flux is 60-300 meshes.
7. The method for preparing light ceramsite by using machine-made sand sludge as recited in claim 1 or 2, wherein the water content of the machine-made sand sludge after pressure filtration is 12% -25%.
8. The method for preparing light-weight ceramsite by using machine-made sand sludge as claimed in claim 1, wherein the kneaded material is pelletized and then enters a rotary kiln for calcination, the calcination endpoint temperature of the rotary kiln is 1100-1190 ℃, the tail temperature is less than 350 ℃, the rotation speed is 3-4 r/min, the duration is about 100min, the total length of the rotary kiln is 35m, wherein the diameter of a high-temperature section at the temperature of not less than 600 ℃ is 1m, the length is 17.5m, and the diameter of a low-temperature section at the temperature of not less than 600 ℃ is 0.8m, and the length is 17.5 m.
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Application publication date: 20211224 |