CN113292355A - Method for preparing ceramsite by using sludge of sewage treatment plant - Google Patents
Method for preparing ceramsite by using sludge of sewage treatment plant Download PDFInfo
- Publication number
- CN113292355A CN113292355A CN202110423263.3A CN202110423263A CN113292355A CN 113292355 A CN113292355 A CN 113292355A CN 202110423263 A CN202110423263 A CN 202110423263A CN 113292355 A CN113292355 A CN 113292355A
- Authority
- CN
- China
- Prior art keywords
- ceramsite
- sludge
- raw material
- parts
- spherical
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000010802 sludge Substances 0.000 title claims abstract description 108
- 238000000034 method Methods 0.000 title claims abstract description 55
- 239000010865 sewage Substances 0.000 title claims abstract description 33
- 239000002994 raw material Substances 0.000 claims abstract description 128
- 239000000843 powder Substances 0.000 claims abstract description 66
- 239000005995 Aluminium silicate Substances 0.000 claims abstract description 46
- 235000012211 aluminium silicate Nutrition 0.000 claims abstract description 45
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 claims abstract description 45
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 38
- 239000010881 fly ash Substances 0.000 claims abstract description 36
- 239000011230 binding agent Substances 0.000 claims abstract description 35
- 239000011521 glass Substances 0.000 claims abstract description 33
- 241000209094 Oryza Species 0.000 claims abstract description 31
- 235000007164 Oryza sativa Nutrition 0.000 claims abstract description 31
- 235000009566 rice Nutrition 0.000 claims abstract description 31
- 238000002156 mixing Methods 0.000 claims abstract description 30
- 238000001035 drying Methods 0.000 claims abstract description 27
- 239000000463 material Substances 0.000 claims abstract description 27
- 239000002002 slurry Substances 0.000 claims abstract description 17
- 239000011265 semifinished product Substances 0.000 claims abstract description 11
- 238000001816 cooling Methods 0.000 claims abstract description 9
- 238000002360 preparation method Methods 0.000 claims abstract description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 29
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 24
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 23
- 239000007789 gas Substances 0.000 claims description 22
- 230000008569 process Effects 0.000 claims description 19
- 238000005469 granulation Methods 0.000 claims description 16
- 230000003179 granulation Effects 0.000 claims description 12
- 229910052757 nitrogen Inorganic materials 0.000 claims description 12
- 238000003825 pressing Methods 0.000 claims description 12
- 239000004372 Polyvinyl alcohol Substances 0.000 claims description 8
- 229910052799 carbon Inorganic materials 0.000 claims description 8
- 229920002451 polyvinyl alcohol Polymers 0.000 claims description 8
- 239000006227 byproduct Substances 0.000 claims description 7
- 239000003245 coal Substances 0.000 claims description 7
- 238000007906 compression Methods 0.000 claims description 7
- 230000006835 compression Effects 0.000 claims description 7
- 239000000395 magnesium oxide Substances 0.000 claims description 7
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims description 7
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 claims description 7
- 239000000203 mixture Substances 0.000 claims description 7
- 238000007664 blowing Methods 0.000 claims description 6
- PUZPDOWCWNUUKD-UHFFFAOYSA-M sodium fluoride Chemical compound [F-].[Na+] PUZPDOWCWNUUKD-UHFFFAOYSA-M 0.000 claims description 6
- 238000003756 stirring Methods 0.000 claims description 6
- 238000010438 heat treatment Methods 0.000 claims description 5
- PSHMSSXLYVAENJ-UHFFFAOYSA-N dilithium;[oxido(oxoboranyloxy)boranyl]oxy-oxoboranyloxyborinate Chemical compound [Li+].[Li+].O=BOB([O-])OB([O-])OB=O PSHMSSXLYVAENJ-UHFFFAOYSA-N 0.000 claims description 4
- 229920005610 lignin Polymers 0.000 claims description 4
- KGBXLFKZBHKPEV-UHFFFAOYSA-N boric acid Chemical compound OB(O)O KGBXLFKZBHKPEV-UHFFFAOYSA-N 0.000 claims description 3
- 239000004327 boric acid Substances 0.000 claims description 3
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 claims description 3
- 229910001634 calcium fluoride Inorganic materials 0.000 claims description 3
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 claims description 3
- 239000000292 calcium oxide Substances 0.000 claims description 3
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims description 3
- 230000004907 flux Effects 0.000 claims description 3
- 239000001866 hydroxypropyl methyl cellulose Substances 0.000 claims description 3
- 229920003088 hydroxypropyl methyl cellulose Polymers 0.000 claims description 3
- UFVKGYZPFZQRLF-UHFFFAOYSA-N hydroxypropyl methyl cellulose Chemical compound OC1C(O)C(OC)OC(CO)C1OC1C(O)C(O)C(OC2C(C(O)C(OC3C(C(O)C(O)C(CO)O3)O)C(CO)O2)O)C(CO)O1 UFVKGYZPFZQRLF-UHFFFAOYSA-N 0.000 claims description 3
- 235000010979 hydroxypropyl methyl cellulose Nutrition 0.000 claims description 3
- ZLNQQNXFFQJAID-UHFFFAOYSA-L magnesium carbonate Chemical compound [Mg+2].[O-]C([O-])=O ZLNQQNXFFQJAID-UHFFFAOYSA-L 0.000 claims description 3
- 239000001095 magnesium carbonate Substances 0.000 claims description 3
- 229910000021 magnesium carbonate Inorganic materials 0.000 claims description 3
- VTHJTEIRLNZDEV-UHFFFAOYSA-L magnesium dihydroxide Chemical compound [OH-].[OH-].[Mg+2] VTHJTEIRLNZDEV-UHFFFAOYSA-L 0.000 claims description 3
- 239000000347 magnesium hydroxide Substances 0.000 claims description 3
- 229910001862 magnesium hydroxide Inorganic materials 0.000 claims description 3
- 229920002401 polyacrylamide Polymers 0.000 claims description 3
- 239000011775 sodium fluoride Substances 0.000 claims description 3
- 235000013024 sodium fluoride Nutrition 0.000 claims description 3
- KXGFMDJXCMQABM-UHFFFAOYSA-N 2-methoxy-6-methylphenol Chemical compound [CH]OC1=CC=CC([CH])=C1O KXGFMDJXCMQABM-UHFFFAOYSA-N 0.000 claims description 2
- 238000001354 calcination Methods 0.000 claims description 2
- 239000005011 phenolic resin Substances 0.000 claims description 2
- 229920001568 phenolic resin Polymers 0.000 claims description 2
- 238000011085 pressure filtration Methods 0.000 claims description 2
- 238000002791 soaking Methods 0.000 claims description 2
- 230000002829 reductive effect Effects 0.000 abstract description 20
- 230000008901 benefit Effects 0.000 abstract description 12
- 230000008595 infiltration Effects 0.000 abstract description 5
- 238000001764 infiltration Methods 0.000 abstract description 5
- 238000004064 recycling Methods 0.000 abstract description 5
- 230000007613 environmental effect Effects 0.000 abstract description 3
- 239000007791 liquid phase Substances 0.000 description 12
- 239000002245 particle Substances 0.000 description 10
- 238000005245 sintering Methods 0.000 description 9
- 239000004927 clay Substances 0.000 description 8
- 239000010410 layer Substances 0.000 description 8
- 230000009286 beneficial effect Effects 0.000 description 6
- 238000005336 cracking Methods 0.000 description 5
- 238000010304 firing Methods 0.000 description 5
- 230000001681 protective effect Effects 0.000 description 5
- 239000000126 substance Substances 0.000 description 5
- 230000008859 change Effects 0.000 description 4
- 239000000428 dust Substances 0.000 description 4
- 239000000919 ceramic Substances 0.000 description 3
- 238000005261 decarburization Methods 0.000 description 3
- 239000008188 pellet Substances 0.000 description 3
- 238000003746 solid phase reaction Methods 0.000 description 3
- 239000002699 waste material Substances 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 229910052681 coesite Inorganic materials 0.000 description 2
- 239000000571 coke Substances 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- 229910052593 corundum Inorganic materials 0.000 description 2
- 229910052906 cristobalite Inorganic materials 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 239000008187 granular material Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000011368 organic material Substances 0.000 description 2
- 239000012071 phase Substances 0.000 description 2
- 229910052573 porcelain Inorganic materials 0.000 description 2
- 230000001737 promoting effect Effects 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 239000000377 silicon dioxide Substances 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 229910052682 stishovite Inorganic materials 0.000 description 2
- 239000002344 surface layer Substances 0.000 description 2
- 229910052905 tridymite Inorganic materials 0.000 description 2
- 239000011345 viscous material Substances 0.000 description 2
- 229910001845 yogo sapphire Inorganic materials 0.000 description 2
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 239000002956 ash Substances 0.000 description 1
- 244000052616 bacterial pathogen Species 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 150000001722 carbon compounds Chemical class 0.000 description 1
- 239000010883 coal ash Substances 0.000 description 1
- 238000009264 composting Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000005496 eutectics Effects 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 239000000295 fuel oil Substances 0.000 description 1
- 238000010413 gardening Methods 0.000 description 1
- 229910001385 heavy metal Inorganic materials 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 230000000670 limiting effect Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000010705 motor oil Substances 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 229910052604 silicate mineral Inorganic materials 0.000 description 1
- 239000002910 solid waste Substances 0.000 description 1
- GOLXNESZZPUPJE-UHFFFAOYSA-N spiromesifen Chemical compound CC1=CC(C)=CC(C)=C1C(C(O1)=O)=C(OC(=O)CC(C)(C)C)C11CCCC1 GOLXNESZZPUPJE-UHFFFAOYSA-N 0.000 description 1
- 239000010902 straw Substances 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
- 238000004056 waste incineration Methods 0.000 description 1
- 239000002023 wood Substances 0.000 description 1
Classifications
-
- 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
- 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
- C04B38/0675—Vegetable refuse; Cellulosic materials, e.g. wood chips, cork, peat, paper
-
- 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
-
- 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
- C04B33/131—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
- C04B33/132—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
- C04B33/30—Drying methods
-
- 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
- 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
- C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3205—Alkaline earth oxides or oxide forming salts thereof, e.g. beryllium oxide
- C04B2235/3206—Magnesium oxides or oxide-forming salts thereof
-
- 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
- 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
- C04B2235/36—Glass starting materials for making ceramics, e.g. silica glass
-
- 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
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/60—Aspects relating to the preparation, properties or mechanical treatment of green bodies or pre-forms
- C04B2235/606—Drying
-
- 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
- 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
-
- 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
- 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
- C04B2235/6562—Heating rate
-
- 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
- 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
- C04B2235/6565—Cooling rate
-
- 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
- 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
-
- 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
- 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
- C04B2235/658—Atmosphere during thermal treatment
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/70—Aspects relating to sintered or melt-casted ceramic products
- C04B2235/74—Physical characteristics
- C04B2235/77—Density
-
- 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
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/70—Aspects relating to sintered or melt-casted ceramic products
- C04B2235/96—Properties of ceramic products, e.g. mechanical properties such as strength, toughness, wear resistance
-
- 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)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Dispersion Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Wood Science & Technology (AREA)
- Environmental & Geological Engineering (AREA)
- Treatment Of Sludge (AREA)
Abstract
The invention provides a method for preparing ceramsite by utilizing sludge of a sewage treatment plant, belonging to the technical field of sludge recycling. The method comprises the steps of firstly, pretreating sludge produced by a sewage treatment plant and kaolin by taking the sludge of the sewage treatment plant as a main raw material and taking the kaolin, glass powder, rice hull powder, a fluxing agent and a binding agent as auxiliary materials; then mixing the sludge, kaolin, glass powder, rice hull powder and a fluxing agent according to a certain proportion to obtain a mixed material; then the mixed material is granulated for the first time to obtain a semi-finished product of spherical ceramsite raw material, raw materials are continuously added, mixed and granulated for the second time to obtain spherical ceramsite raw material, and then the spherical ceramsite raw material is put into the fly ash slurry for infiltration; and drying, preheating, roasting and cooling to finish the preparation of the sludge ceramsite. The ceramsite prepared by the method has high compressive strength and low bulk density, the cost of sludge treatment is reduced by using sludge as a main raw material to prepare the ceramsite, the secondary pollution risk of the sludge is reduced, and the ceramsite has good economic benefit and environmental benefit.
Description
Technical Field
The invention belongs to the technical field of sludge recycling, and particularly relates to a method for preparing ceramsite by using sludge of a sewage treatment plant.
Background
The sludge is a byproduct generated in the sewage treatment process of a sewage treatment plant, has the characteristics of high water content and low strength, often contains pathogenic bacteria, heavy metals, toxic harmful refractory organics and other harmful components, and is very easy to cause secondary pollution if not properly treated. Most of the traditional sludge treatment methods adopt modes such as sludge landfill, land utilization, sludge composting, sludge incineration, ocean dumping and the like, but the modes have certain disadvantages, wherein ocean dumping is strictly forbidden, the sludge landfill occupies a large amount of land resources, the sludge incineration tail gas treatment is difficult to control, and the like. Therefore, research on novel sludge treatment technologies and realization of sludge resource utilization are receiving more and more attention.
If the sludge is used as solid waste which is difficult to treat and is consumed in a large amount as a ceramsite raw material, the sludge is beneficial to realizing resource utilization of the sludge and reducing the harm to the environment; the sludge contains rich carbon compounds, and can emit a large amount of heat in the decarburization and pore-forming processes, so that the energy consumption can be reduced; the ceramsite raw material of the traditional ceramsite factory can be well expanded by generally adding a proper amount of organic materials such as heavy oil, waste engine oil, residual oil, coal powder or wood dust, for example, if sludge is used as a main raw material for producing the ceramsite, the using amount of the organic materials can be reduced, and the production cost can be reduced.
At present, people are working on how to treat the sludge, which can not only solve the problem of sludge treatment, but also change waste into valuables, so that the sludge is continuously used by people and is converted into a product which benefits the mankind. The sludge is treated by a certain method to prepare the ceramsite, so that the problem of stacking the sludge can be solved, the waste can be changed into valuable, the ceramsite can be continuously used by people, and the method is a treatment method with good environmental benefit and good economic benefit.
The ceramsite has the advantages of high strength, low density, sound insulation, noise reduction, difficult heat conduction, shrinkage resistance, rough and porous surface, large specific surface area and the like, and has wide application prospect in the aspects of building materials, water treatment, sound absorption materials, gardening matrixes and the like. The ceramsite can be classified into clay ceramsite, shale ceramsite, coal ash ceramsite and the like according to different preparation raw materials, wherein the clay and the shale belong to non-renewable resources, and related policies of China forbid exploitation or limit exploitation are provided. The chemical composition of the sludge is similar to that of the raw materials for preparing the ceramsite, so researchers consider that the sludge replaces clay, shale and other non-renewable resources to produce the ceramsite. Compared with industrial sludge, the sludge of the sewage treatment plant has large yield and relatively simple components, and becomes a key research object for preparing ceramsite by recycling sludge. Therefore, the sludge replaces clay and shale to be used as the main materials for producing the ceramsite, so that the nonrenewable resources can be protected, a large amount of sludge from a sewage treatment plant can be treated at the same time, a new way for recycling the sludge is developed, and certain economic benefits and social benefits are achieved.
Patent publication No. CN 106830892A discloses a method for preparing ceramsite by using industrial sludge, waste incineration fly ash and straws as raw materials, which does not undergo preheating and drying before calcining ceramsite raw materials at high temperature, so that decarburization is insufficient, phenomena of reduced expansion performance, internal black cores and nonuniform micropore structures, even cracking and the like occur, and the performance of the ceramsite is influenced; in addition, the temperature in the roasting process of the method is 1100-1350 ℃, although the adhesive is used, the sintering temperature is too high, so that the cracking phenomenon of the ceramsite in the roasting process is easy to occur.
Patent publication No. CN 101531500A discloses a method for firing ceramsite by using sludge, which is characterized in that in the roasting process, the ceramsite is kept for 55-60min at the maximum temperature of 1000-1100 ℃, the sintering time is too long, and the ceramsite is easy to crack and dust in the roasting process because no binder is used in the raw materials.
Therefore, in order to solve the above technical problems, it is necessary to provide a method for preparing ceramsite with good performance and low preparation cost by using sludge as a main raw material.
Disclosure of Invention
Aiming at the problems, the invention provides a method for preparing ceramsite by utilizing sludge of a sewage treatment plant, which takes sludge, kaolin, fly ash, glass powder, rice hull powder, fluxing agent and binder as raw materials to be fired into the ceramsite.
The invention is realized by the following technical scheme:
a method for preparing ceramsite by utilizing sludge of a sewage treatment plant comprises the following steps:
(1) pretreatment: pretreatment: performing pressure filtration on sludge produced by a sewage treatment plant under the ultrahigh pressure of 8-12MPa by using a sludge press-drying machine to obtain pressure-filtered sludge; crushing and thinning the dried kaolin to a fineness of 50-100 meshes;
(2) first granulation: mixing the filter-pressing sludge and the refined kaolin, and adding glass powder, rice hull powder, a fluxing agent and a binder to uniformly mix to prepare a mixed material; granulating the mixed material to obtain a semi-finished product of spherical ceramsite raw material;
(3) and (3) second granulation: continuously adding kaolin, glass powder, rice hull powder, a fluxing agent and a binder into the semi-finished product of the spherical ceramsite raw material, fully stirring and uniformly mixing, granulating again to obtain a spherical ceramsite raw material with the thickness of 10-15mm, and then soaking the spherical ceramsite raw material into slurry consisting of graphite powder and fly ash to enable a layer of slurry to be adhered to the surface of the spherical ceramsite raw material;
(4) and (3) drying: naturally drying the spherical ceramsite raw material with the slurry adhered to the surface for 2-4 days, and then drying by blowing at the temperature of 105-110 ℃ for 2-5 hours to fully remove the water in the spherical ceramsite raw material;
(5) preheating: preheating the dried spherical ceramsite raw material at the temperature of 250 ℃ and 400 ℃ for 18-25min, removing residual water in the spherical ceramsite raw material, and removing part of carbon in the spherical ceramsite raw material;
(6) roasting: transferring the preheated spherical ceramsite raw material into a roasting furnace, heating to 450-temperature-changing 600 ℃ at the speed of 5-10 ℃/min, keeping at the temperature of 450-temperature-changing 600 ℃ for 35-50min, then heating to the maximum temperature of 950-1050 ℃ at the speed of 15-20 ℃/min, keeping at the maximum temperature for 10-25min, then cooling to 350-temperature-changing 400 ℃ at the speed of 15-20 ℃/min, cooling overnight to 70-80 ℃, and finally cooling to room temperature to finish the preparation of the sludge ceramsite.
Preferably, in the step (2), the mixed material is prepared by mixing the following raw materials in parts by weight: 40-55 parts of filter-pressing sludge, 18-25 parts of kaolin, 5-10 parts of glass powder, 2-5 parts of rice hull powder, 3-5 parts of fluxing agent and 1-3 parts of binder.
Preferably, in the step (3), the spherical ceramsite raw material obtained by re-granulating is prepared by mixing the following raw materials in parts by weight: 50-60 parts of spherical ceramsite raw material semi-finished product, 10-15 parts of kaolin, 3-6 parts of glass powder, 1-2 parts of rice hull powder, 2-3 parts of fluxing agent and 1-2 parts of binder.
Preferably, the flux is one or a combination of two or more of magnesium hydroxide, magnesium carbonate, calcium fluoride, sodium fluoride, boric acid, lithium tetraborate, magnesium oxide and calcium oxide.
Preferably, the flux is magnesium oxide.
Preferably, the fluxing agent is formed by mixing calcium fluoride and lithium tetraborate according to the mass ratio of 1-2: 1.
Preferably, the fluxing agent is formed by mixing magnesium hydroxide, boric acid and calcium oxide according to the mass ratio of 1:1: 2-3.
Preferably, the fluxing agent is formed by mixing magnesium carbonate, sodium fluoride and lithium tetraborate according to the mass ratio of 0.4-0.8:1-3: 1.
Preferably, the binder is one or a combination of more than two of hydroxypropyl methylcellulose, polyvinyl alcohol, polyacrylamide, lignin and phenolic resin.
Preferably, the binder is polyvinyl alcohol.
Preferably, the binder is prepared by mixing hydroxypropyl methylcellulose and lignin according to a mass ratio of 1: 1-3.
Preferably, the binder is prepared by mixing polyvinyl alcohol, polyacrylamide and lignin according to a mass ratio of 1:2-5: 1.
Preferably, in the step (3), the mass ratio of the graphite powder to the fly ash is 1: 1-3.
Preferably, nitrogen is used as a protective gas during the roasting in the step (6), and the nitrogen flow rate is maintained at 250-300 mL/min.
Preferably, the compression strength of the ceramsite cooled in the step (6) is 25-30Mpa, and the bulk density is 400-650Kg/m3。
Preferably, in the step (1), the water content of the press-filtered sludge is 30-40%; the water content of the dried kaolin is 20-35%.
Preferably, in the step (3), the fly ash is a byproduct of a thermal power plant after coal burning.
The firing mechanism of the ceramsite is as follows: the pellets are melted at high temperature to generate proper viscosity and surface tension, simultaneously, the inside of the pellets is subjected to chemical reaction to release gas, the gas acts on a molten liquid phase to generate air holes to expand, the surface is a compact and hard glaze layer after cooling, and the inside of the glaze layer is of a closed porous structure. Two conditions for the expansion of the ceramsite are generated; firstly, the molten liquid phase has proper viscosity and surface tension at the expansion temperature; ② simultaneously can generate enough amount of gas.
Chemical component SiO in sludge2、Al2O3The ceramic powder is sintered together with the base material to form a structural framework to provide strength, and organic matters in the sludge are decomposed to generate gas in the sintering process, so that the expansion of the ceramic particles is promoted, and the reduction of the density of the ceramic particles is facilitated. Proper amount of SiO2Can promote the formation of liquid phase at 1000 ℃, wrap solid particles, fill pores in the solid particles and improve the bonding force among the particles through capillary action. During sintering, SiO2The ceramsite is a framework material, can react with other components to form silicate mineral substances, forms an eutectic point at about 1000 ℃, effectively reduces the sintering point of the material, promotes the formation of a liquid phase, and improves the characteristics of the ceramsite.
When the sludge is used as a main raw material of the ceramsite, if decarburization is insufficient, the phenomena of reduced expansibility, internal black cores, different sizes of microporous structures, even cracking and the like can occur, so that the performance of the ceramsite is influenced; when the ceramsite enters a high-temperature roasting stage, if too many coke particles exist in the ceramsite, solid-phase reaction among silicate particles can be hindered, after a liquid phase is generated, the coke particles cannot be co-melted with a molten liquid, and mutual melting and crystal phase reaction of other substances in the liquid phase are not facilitated, so that the performance of a melt is deteriorated, and the pellet expansion and the ceramsite strength are influenced.
Therefore, in the invention, the raw material ball is preheated before roasting, so as to reduce the burst caused by the rapid temperature change when the raw material ball suddenly enters a high-temperature environment and gradually generate gas; and part of carbon in the raw material balls can be removed, and the expansion performance and the strength of the ceramsite are improved.
The kaolin is soft and can be easily dispersed and suspended in water, has good plasticity and high cohesiveness, and Al in the kaolin2O3Higher content is beneficial toThe strength of the ceramsite is improved, and the roasting temperature is reduced.
The graphite powder and the fly ash slurry are coated on the surface of the spherical ceramsite raw material, so that the adhesion phenomenon among ceramsite particles during roasting of the spherical ceramsite raw material can be avoided, in addition, the fly ash can promote the viscosity of a viscous substance on the surface layer of the ceramsite to be increased, the gas is effectively inhibited from escaping from the body, micropores formed on the surface of the ceramsite are reduced, the ceramsite obtains an outer surface with regular appearance and hardness, and the unirradiated gas enables the interior of the ceramsite to form a uniform porous structure.
The glass powder can change the internal physical and chemical changes of the ceramsite in the roasting process, the liquid phase generated after the glass powder is melted can contain gas, the escape of the gas is reduced, a porous structure is formed, the density of the ceramsite is obviously reduced, and meanwhile, the melted glass powder serving as a base phase can also improve the strength of the ceramsite.
The rice hull powder is burnt into ash in the baking process of the ceramsite to form a large number of micropores, which is beneficial to increasing the porosity inside the ceramsite.
The fluxing agent can effectively reduce the sintering temperature of the liquid phase and improve the generation amount of the liquid phase, thereby promoting the smooth proceeding of the solid phase reaction.
The binder can improve the apparent density of the ceramsite, reduce the sintering temperature, and ensure that the ceramsite is not easy to crack and generate dust in the roasting process.
Compared with the prior art, the invention has the advantages and beneficial effects that:
1. the invention utilizes the sludge of the sewage treatment plant to replace clay and shale as main materials, and utilizes the sludge to produce the ceramsite, thereby having great significance for developing circular economy, implementing sustainable development strategy and protecting environment and having wide market prospect. The invention takes the sludge, the kaolin, the fly ash, the glass powder, the rice hull powder and the fluxing agent as raw materials to be fired into the ceramsite, thereby not only reducing the cost of sludge treatment and disposal and firing the ceramsite by the raw materials such as pure clay, shale and the like, having certain economic benefit, but also reducing the secondary pollution risk of the sludge, and further having certain environmental benefit.
2. The invention takes the sludge of the sewage treatment plant as the main raw material for preparing the ceramsite, the sludge has higher heat value, and part of the heat generated during the roasting of the spherical ceramsite raw material comes from the combustion of the organic matters in the sludge, thereby fully utilizing the heat released by the organic matters in the sludge in the heating process, reducing the consumption of fuel during the combustion and shortening the roasting time. Therefore, compared with the porcelain granules which are generally fired by taking clay, shale and the like as raw materials, the porcelain granules have the advantages of less energy consumption and lower production cost. The method for firing the ceramsite by utilizing the sludge of the sewage treatment plant not only saves raw materials such as clay, shale and the like, but also opens up a new way for recycling the sludge more importantly.
3. The ceramsite is prepared by firing the raw materials of sludge, kaolin, fly ash, glass powder, rice hull powder, a fluxing agent and a binder, wherein the kaolin has good plasticity and high cohesiveness, and the kaolin has high Al2O3 content, so that the strength of the ceramsite is improved and the roasting temperature is reduced; the glass powder can reduce the escape of gas, is beneficial to forming a porous structure and reduces the density of the ceramsite; the rice hull powder can form a large number of micropores, which is beneficial to increasing the porosity inside the ceramsite; the surface of the ceramsite raw material is coated with a layer of fly ash and graphite powder, so that the adhesion phenomenon among ceramsite can be avoided, and micropores formed on the surface of the ceramsite can be reduced, so that the ceramsite has a regular and hard outer surface; the fluxing agent can effectively reduce the sintering temperature of the liquid phase and improve the generation amount of the liquid phase, thereby promoting the smooth proceeding of the solid phase reaction; the binder can improve the apparent density of the ceramsite, reduce the sintering temperature, and ensure that the ceramsite is not easy to crack and generate dust in the roasting process. The compression strength of the ceramsite prepared by the method is 25-30Mpa, and the bulk density is 400-650Kg/m3。
4. The graphite powder and the fly ash slurry are coated on the surface of the spherical ceramsite raw material, so that the adhesion phenomenon among ceramsite particles during roasting of the spherical ceramsite raw material can be avoided, in addition, the fly ash can promote the viscosity of a viscous substance on the surface layer of the ceramsite to be increased, the gas is effectively inhibited from escaping from the blank, micropores formed on the surface of the ceramsite are reduced, the ceramsite obtains an outer surface with regular and hard appearance, and the gas which does not escape enables the interior of the ceramsite to form a uniform porous structure.
5. The invention carries out drying treatment on the spherical ceramsite raw material, can remove the water in the raw material balls and prevent cracking in the roasting process. The spherical ceramsite raw material is preheated before roasting, so that the cracking of the spherical ceramsite raw material caused by rapid temperature change when the spherical ceramsite raw material suddenly enters a high-temperature environment is reduced, and gas is gradually generated; and removing part of carbon in the spherical ceramsite raw material, thereby improving the expansion performance and the strength of the ceramsite. The roasting process is a dynamic balance process of generating an expansion gas escape and a proper viscosity liquid phase and inhibiting the gas escape, the final performance of the sludge ceramsite is directly influenced, and the roasting temperature, the roasting time, the roasting atmosphere and the like must be controlled well, so that the roasting temperature of the invention is controlled at 950-. The cooling function is to gradually form a hard shell on the surface of the ceramsite, so that the surface of the ceramsite is compact, and the inside of the ceramsite is a closed gap, so that the water absorption is reduced, and the strength is improved.
Detailed Description
The present invention is further illustrated by the following examples, which are provided only for illustrating the present invention and are not intended to limit the scope of the present invention.
Example 1
A method for preparing ceramsite by utilizing sludge of a sewage treatment plant comprises the following steps:
(1) pretreatment: utilizing a sludge press-drying machine to press and filter sludge produced by a sewage treatment plant under the ultrahigh pressure of 10MPa, wherein the water content is 38%; crushing and thinning the dried kaolin, wherein the fineness is 50 meshes, and the water content of the dried kaolin is 25%;
(2) first granulation: mixing the filter-pressing sludge and the refined kaolin, and adding glass powder, rice hull powder and a fluxing agent to uniformly mix to prepare a mixed material; the mixed material is prepared by mixing the following raw materials in parts by weight: 48 parts of filter-pressing sludge, 20 parts of kaolin, 6 parts of glass powder, 3 parts of rice hull powder, 4 parts of a fluxing agent and 2 parts of a binder, wherein the fluxing agent is magnesium oxide, and the binder is polyvinyl alcohol; granulating the mixed material to obtain a semi-finished product of spherical ceramsite raw material;
(3) and (3) second granulation: continuously adding kaolin, glass powder, rice hull powder, a fluxing agent and a binder into the semi-finished spherical ceramsite raw material, fully stirring and uniformly mixing, granulating again to obtain a 10mm spherical ceramsite raw material, and then putting the spherical ceramsite raw material into graphite powder and fly ash slurry for infiltration, wherein the mass ratio of the graphite powder to the fly ash is 1:2, and the fly ash is a byproduct generated after coal burning of a thermal power plant, so that a layer of fly ash slurry is adhered to the surface of the spherical ceramsite raw material; the spherical ceramsite raw material obtained by re-granulation is prepared by mixing the following raw materials in parts by weight: 53 parts of semi-finished spherical ceramsite raw material, 12 parts of kaolin, 4 parts of glass powder, 1 part of rice hull powder, 2 parts of fluxing agent and 1 part of binder;
(4) and (3) drying: naturally drying the spherical ceramsite raw material with the surface adhered with the fly ash for 4 days, and then blowing and drying for 3 hours at the temperature of 110 ℃ to fully remove the water in the spherical ceramsite raw material;
(5) preheating: preheating the dried spherical ceramsite raw material at 300 ℃ for 25min, removing residual water in the spherical ceramsite raw material, and removing part of carbon in the spherical ceramsite raw material;
(6) roasting: and transferring the preheated spherical ceramsite raw material into a roasting furnace, wherein nitrogen is used as protective gas in the roasting process, the nitrogen flow rate is kept at 250mL/min, the temperature is increased to 500 ℃ at the speed of 8 ℃/min, the temperature is kept at 500 ℃ for 40min, then the temperature is increased to the maximum temperature of 950 ℃ at the speed of 15 ℃/min, the temperature is kept for 15min at the maximum temperature, then the temperature is reduced to 400 ℃ at the speed of 15 ℃/min, the temperature is cooled to 80 ℃ overnight, and finally the temperature is cooled to room temperature, so that the preparation of the sludge ceramsite is completed.
The compression strength of the ceramsite prepared by the method is 30Mpa, and the bulk density is 400Kg/m3。
Example 2
A method for preparing ceramsite by utilizing sludge of a sewage treatment plant comprises the following steps:
(1) pretreatment: utilizing a sludge press-drying machine to press and filter sludge produced by a sewage treatment plant under the ultrahigh pressure of 8MPa, wherein the water content is 35%; crushing and thinning the dried kaolin to a fineness of 80 meshes, wherein the water content of the dried kaolin is 28%;
(2) first granulation: mixing the filter-pressing sludge and the refined kaolin, and adding glass powder, rice hull powder and a fluxing agent to uniformly mix to prepare a mixed material; the mixed material is prepared by mixing the following raw materials in parts by weight: 45 parts of filter-pressing sludge, 23 parts of kaolin, 8 parts of glass powder, 4 parts of rice hull powder, 4 parts of a fluxing agent and 1 part of a binder, wherein the fluxing agent is magnesium oxide, and the binder is polyvinyl alcohol; granulating the mixed material to obtain a semi-finished product of spherical ceramsite raw material;
(3) and (3) second granulation: continuously adding kaolin, glass powder, rice hull powder, a fluxing agent and a binder into the semi-finished spherical ceramsite raw material, fully stirring and uniformly mixing, granulating again to obtain a spherical ceramsite raw material with the thickness of 12mm, and then putting the spherical ceramsite raw material into graphite powder and fly ash slurry for infiltration, wherein the mass ratio of the graphite powder to the fly ash is 1:1, the fly ash is a byproduct of a thermal power plant after burning coal, and a layer of fly ash slurry is adhered to the surface of the spherical ceramsite raw material; the spherical ceramsite raw material obtained by re-granulation is prepared by mixing the following raw materials in parts by weight: 55 parts of semi-finished spherical ceramsite raw material, 10 parts of kaolin, 5 parts of glass powder, 1 part of rice hull powder, 2 parts of fluxing agent and 1 part of binder;
(4) and (3) drying: naturally drying the spherical ceramsite raw material with the surface adhered with the fly ash for 3 days, and then drying by blowing at 108 ℃ for 4 hours to fully remove the water in the spherical ceramsite raw material;
(5) preheating: preheating the dried spherical ceramsite raw material at 350 ℃ for 20min, removing residual water in the spherical ceramsite raw material, and removing part of carbon in the spherical ceramsite raw material;
(6) roasting: and transferring the preheated spherical ceramsite raw material into a roasting furnace, wherein nitrogen is used as protective gas in the roasting process, the nitrogen flow rate is kept at 280mL/min, the temperature is increased to 480 ℃ at the speed of 5 ℃/min, the temperature is kept at 480 ℃ for 45min, then the temperature is increased to the maximum temperature of 1000 ℃ at the speed of 18 ℃/min, the temperature is kept at the maximum temperature for 20min, then the temperature is reduced to 380 ℃ at the speed of 18 ℃/min, the temperature is cooled to 75 ℃ overnight, and finally the temperature is cooled to room temperature, so that the preparation of the sludge ceramsite is completed.
The compression strength of the ceramsite prepared by the method is 28Mpa, and the bulk density is 520Kg/m3。
Example 3
A method for preparing ceramsite by utilizing sludge of a sewage treatment plant comprises the following steps:
(1) pretreatment: utilizing a sludge press-drying machine to press and filter sludge produced by a sewage treatment plant under the ultrahigh pressure of 8MPa, wherein the water content is 40%; crushing and thinning the dried kaolin, wherein the fineness is 50 meshes, and the water content of the dried kaolin is 20%;
(2) first granulation: mixing the filter-pressing sludge and the refined kaolin, and adding glass powder, rice hull powder and a fluxing agent to uniformly mix to prepare a mixed material; the mixed material is prepared by mixing the following raw materials in parts by weight: 40 parts of filter-pressing sludge, 18 parts of kaolin, 5 parts of glass powder, 2 parts of rice hull powder, 3 parts of a fluxing agent and 1 part of a binder, wherein the fluxing agent is magnesium oxide, and the binder is polyvinyl alcohol; granulating the mixed material to obtain a semi-finished product of spherical ceramsite raw material;
(3) and (3) second granulation: continuously adding kaolin, glass powder, rice hull powder, a fluxing agent and a binder into the semi-finished spherical ceramsite raw material, fully stirring and uniformly mixing, granulating again to obtain a 10mm spherical ceramsite raw material, and then putting the spherical ceramsite raw material into graphite powder and fly ash slurry for infiltration, wherein the mass ratio of the graphite powder to the fly ash is 1:1, the fly ash is a byproduct generated after coal burning of a thermal power plant, and a layer of fly ash slurry is adhered to the surface of the spherical ceramsite raw material; the spherical ceramsite raw material obtained by re-granulation is prepared by mixing the following raw materials in parts by weight: 50 parts of semi-finished spherical ceramsite raw material, 10 parts of kaolin, 3 parts of glass powder, 1 part of rice hull powder, 2 parts of fluxing agent and 1 part of binder;
(4) and (3) drying: naturally drying the spherical ceramsite raw material with the surface adhered with the fly ash for 2 days, and then blowing and drying for 5 hours at the temperature of 110 ℃ to fully remove the water in the spherical ceramsite raw material;
(5) preheating: preheating the dried spherical ceramsite raw material at 250 ℃ for 25min, removing residual water in the spherical ceramsite raw material, and removing part of carbon in the spherical ceramsite raw material;
(6) roasting: and transferring the preheated spherical ceramsite raw material into a roasting furnace, wherein nitrogen is used as protective gas in the roasting process, the flow rate of the nitrogen is kept at 250mL/min, the temperature is increased to 450 ℃ at the speed of 5 ℃/min, the temperature is kept at 450 ℃ for 50min, then the temperature is increased to the maximum temperature of 950 ℃ at the speed of 15 ℃/min, the temperature is kept at the maximum temperature for 25min, then the temperature is reduced to 400 ℃ at the speed of 15 ℃/min, the temperature is cooled to 80 ℃ overnight, and finally the temperature is cooled to room temperature, so that the preparation of the sludge ceramsite is completed.
The compression strength of the ceramsite prepared by the method is 25Mpa, and the bulk density is 650Kg/m3。
Example 4
A method for preparing ceramsite by utilizing sludge of a sewage treatment plant comprises the following steps:
(1) pretreatment: utilizing a sludge press-drying machine to press and filter sludge produced by a sewage treatment plant under the ultrahigh pressure of 12MPa, wherein the water content is 30%; crushing and thinning the dried kaolin, wherein the fineness is 100 meshes, and the water content of the dried kaolin is 35%;
(2) first granulation: mixing the filter-pressing sludge and the refined kaolin, and adding glass powder, rice hull powder and a fluxing agent to uniformly mix to prepare a mixed material; the mixed material is prepared by mixing the following raw materials in parts by weight: 55 parts of filter-pressing sludge, 25 parts of kaolin, 10 parts of glass powder, 5 parts of rice hull powder, 5 parts of a fluxing agent and 3 parts of a binder, wherein the fluxing agent is magnesium oxide, and the binder is polyvinyl alcohol; granulating the mixed material to obtain a semi-finished product of spherical ceramsite raw material;
(3) and (3) second granulation: continuously adding kaolin, glass powder, rice hull powder, a fluxing agent and a binder into the semi-finished spherical ceramsite raw material, fully stirring and uniformly mixing, granulating again to obtain a spherical ceramsite raw material with the thickness of 15mm, and then putting the spherical ceramsite raw material into graphite powder and fly ash slurry for infiltration, wherein the mass ratio of the graphite powder to the fly ash is 1:3, and the fly ash is a byproduct generated after coal burning of a thermal power plant, so that a layer of fly ash slurry is adhered to the surface of the spherical ceramsite raw material; the spherical ceramsite raw material obtained by re-granulation is prepared by mixing the following raw materials in parts by weight: 60 parts of semi-finished spherical ceramsite raw material, 15 parts of kaolin, 6 parts of glass powder, 2 parts of rice hull powder, 3 parts of fluxing agent and 2 parts of binder;
(4) and (3) drying: naturally drying the spherical ceramsite raw material with the surface adhered with the fly ash for 4 days, and then drying by blowing at 105 ℃ for 2 hours to fully remove the water in the spherical ceramsite raw material;
(5) preheating: preheating the dried spherical ceramsite raw material at 400 ℃ for 18min, removing residual water in the spherical ceramsite raw material, and removing part of carbon in the spherical ceramsite raw material;
(6) roasting: and transferring the preheated spherical ceramsite raw material into a roasting furnace, wherein nitrogen is used as protective gas in the roasting process, the nitrogen flow rate is kept at 300mL/min, the temperature is increased to 600 ℃ at the speed of 10 ℃/min, the temperature is kept at 600 ℃ for 35min, then the temperature is increased to the maximum temperature 1050 ℃ at the speed of 20 ℃/min, the temperature is kept at the maximum temperature for 10min, then the temperature is reduced to 350 ℃ at the speed of 20 ℃/min, the temperature is cooled to 70 ℃ overnight, and finally the temperature is cooled to room temperature, so that the preparation of the sludge ceramsite is completed.
The compression strength of the ceramsite prepared by the method is 28Mpa, and the bulk density is 480Kg/m3。
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and the like that are within the spirit and principle of the present invention are included in the present invention.
Claims (10)
1. A method for preparing ceramsite by utilizing sludge of a sewage treatment plant is characterized by comprising the following steps:
(1) pretreatment: performing pressure filtration on sludge produced by a sewage treatment plant under the ultrahigh pressure of 8-12MPa by using a sludge press-drying machine to obtain pressure-filtered sludge; crushing and thinning the dried kaolin to a fineness of 50-100 meshes;
(2) first granulation: mixing the filter-pressing sludge and the refined kaolin, and adding glass powder, rice hull powder, a fluxing agent and a binder to uniformly mix to prepare a mixed material; granulating the mixed material to obtain a semi-finished product of spherical ceramsite raw material;
(3) and (3) second granulation: continuously adding kaolin, glass powder, rice hull powder, a fluxing agent and a binder into the semi-finished product of the spherical ceramsite raw material, fully stirring and uniformly mixing, granulating again to obtain a spherical ceramsite raw material with the thickness of 10-15mm, and then soaking the spherical ceramsite raw material into slurry consisting of graphite powder and fly ash to enable a layer of slurry to be adhered to the surface of the spherical ceramsite raw material;
(4) and (3) drying: naturally drying the spherical ceramsite raw material with the slurry adhered to the surface for 2-4 days, and then drying by blowing at the temperature of 105-110 ℃ for 2-5 hours to fully remove the water in the spherical ceramsite raw material;
(5) preheating: preheating the dried spherical ceramsite raw material at the temperature of 250 ℃ and 400 ℃ for 18-25min, removing residual water in the spherical ceramsite raw material, and removing part of carbon in the spherical ceramsite raw material;
(6) roasting: transferring the preheated spherical ceramsite raw material into a roasting furnace, heating to 450-temperature-changing 600 ℃ at the speed of 5-10 ℃/min, keeping at the temperature of 450-temperature-changing 600 ℃ for 35-50min, then heating to the maximum temperature of 950-1050 ℃ at the speed of 15-20 ℃/min, keeping at the maximum temperature for 10-25min, then cooling to 350-temperature-changing 400 ℃ at the speed of 15-20 ℃/min, cooling overnight to 70-80 ℃, and finally cooling to room temperature to finish the preparation of the sludge ceramsite.
2. The method for preparing ceramsite by using sludge from sewage treatment plants according to claim 1, wherein the mixed material in the step (2) is prepared by mixing the following raw materials in parts by weight: 40-55 parts of filter-pressing sludge, 18-25 parts of kaolin, 5-10 parts of glass powder, 2-5 parts of rice hull powder, 3-5 parts of fluxing agent and 1-3 parts of binder.
3. The method for preparing ceramsite by using sludge from sewage treatment plants according to claim 1, wherein the spherical ceramsite raw material obtained by re-granulating in the step (3) is prepared by mixing the following raw materials in parts by weight: 50-60 parts of spherical ceramsite raw material semi-finished product, 10-15 parts of kaolin, 3-6 parts of glass powder, 1-2 parts of rice hull powder, 2-3 parts of fluxing agent and 1-2 parts of binder.
4. The method for preparing ceramsite according to any one of claims 1-3, wherein the flux is one or a combination of two or more of magnesium hydroxide, magnesium carbonate, calcium fluoride, sodium fluoride, boric acid, lithium tetraborate, magnesium oxide and calcium oxide.
5. The method for preparing ceramsite according to any one of claims 1-3, wherein the binder is one or a combination of more than two of hydroxypropyl methylcellulose, polyvinyl alcohol, polyacrylamide, lignin and phenolic resin.
6. The method for preparing ceramsite by using sludge from sewage treatment plants according to claim 1, wherein the mass ratio of the graphite powder to the fly ash in the step (3) is 1: 1-3.
7. The method for preparing ceramsite with sludge from sewage treatment plant as recited in claim 1, wherein nitrogen is used as shielding gas during the calcination process in said step (6), and the nitrogen flow rate is maintained at 250-300 mL/min.
8. The method for preparing ceramsite with sludge from sewage treatment plant as defined in claim 1, wherein the compression strength of the ceramsite cooled in step (6) is 25-30MPa, and the bulk density is 400-650Kg/m3。
9. The method for preparing ceramsite by utilizing sludge from sewage treatment plants according to claim 1, wherein the water content of the press-filtered sludge in the step (1) is 30-40%; the water content of the dried kaolin is 20-35%.
10. The method for preparing ceramsite by using sludge from sewage treatment plants according to claim 1, wherein the fly ash in the step (3) is a byproduct of coal burning of a thermal power plant.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110423263.3A CN113292355A (en) | 2021-04-20 | 2021-04-20 | Method for preparing ceramsite by using sludge of sewage treatment plant |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110423263.3A CN113292355A (en) | 2021-04-20 | 2021-04-20 | Method for preparing ceramsite by using sludge of sewage treatment plant |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113292355A true CN113292355A (en) | 2021-08-24 |
Family
ID=77319997
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110423263.3A Pending CN113292355A (en) | 2021-04-20 | 2021-04-20 | Method for preparing ceramsite by using sludge of sewage treatment plant |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113292355A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114249480A (en) * | 2021-12-25 | 2022-03-29 | 江苏同禾药业有限公司 | Method for treating production wastewater of 6, 8-dichloro ethyl caprylate |
| CN114349527A (en) * | 2022-01-18 | 2022-04-15 | 大连交通大学 | Method for preparing sludge ceramsite by using domestic sludge |
| CN114478050A (en) * | 2021-12-23 | 2022-05-13 | 王梓远 | Sludge ceramsite and preparation method thereof |
| CN114956859A (en) * | 2022-05-23 | 2022-08-30 | 合肥工业大学 | Novel tap water plant sludge-biochar-based ceramsite filter material |
| CN116395727A (en) * | 2023-01-30 | 2023-07-07 | 河南理工大学 | Sludge ladder stage fraction utilization process |
Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA2739991A1 (en) * | 2008-10-13 | 2010-05-27 | Innovnano - Materiais Av Ancados, S.A. | Ceramic powders coated with a nanoparticle layer and process for obtaining thereof |
| CN101798140A (en) * | 2010-03-26 | 2010-08-11 | 河海大学 | Filter material for biological aerated filter and preparation method thereof |
| CN102503540A (en) * | 2011-11-10 | 2012-06-20 | 许庆华 | Spherical attapulgite activated carbon ceramsite filter material |
| CN102515834A (en) * | 2011-11-11 | 2012-06-27 | 安徽工业大学 | Preparation method of waterworks sludge ceramsites for pretreating micro-polluted water |
| CN104355674A (en) * | 2014-10-24 | 2015-02-18 | 广西大学 | Method for sintering porous ceramic material by city sludge |
| CN105541380A (en) * | 2015-12-21 | 2016-05-04 | 中国科学院过程工程研究所 | Fly ash coated sludge ceramsite and preparation method therefor |
| CN106830892A (en) * | 2017-02-24 | 2017-06-13 | 浙江益壤环保科技有限公司 | It is the method that raw material prepares haydite with industrial sludge, incineration of refuse flyash and stalk |
| CN107793169A (en) * | 2017-12-20 | 2018-03-13 | 苏州市世好建材新技术工程有限公司 | A kind of manufacture method of high rigidity refractory brick |
| CN108585934A (en) * | 2018-06-25 | 2018-09-28 | 西安科技大学 | A kind of aluminium sludge ceramsite preparation method |
| CN109336552A (en) * | 2018-11-19 | 2019-02-15 | 西安建筑科技大学 | A kind of pelletizing method and system of sludge ceramsite |
| CN109678462A (en) * | 2018-12-29 | 2019-04-26 | 武汉理工大学 | A kind of Ultralight mud ceramic granules and preparation method thereof |
-
2021
- 2021-04-20 CN CN202110423263.3A patent/CN113292355A/en active Pending
Patent Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA2739991A1 (en) * | 2008-10-13 | 2010-05-27 | Innovnano - Materiais Av Ancados, S.A. | Ceramic powders coated with a nanoparticle layer and process for obtaining thereof |
| CN101798140A (en) * | 2010-03-26 | 2010-08-11 | 河海大学 | Filter material for biological aerated filter and preparation method thereof |
| CN102503540A (en) * | 2011-11-10 | 2012-06-20 | 许庆华 | Spherical attapulgite activated carbon ceramsite filter material |
| CN102515834A (en) * | 2011-11-11 | 2012-06-27 | 安徽工业大学 | Preparation method of waterworks sludge ceramsites for pretreating micro-polluted water |
| CN104355674A (en) * | 2014-10-24 | 2015-02-18 | 广西大学 | Method for sintering porous ceramic material by city sludge |
| CN105541380A (en) * | 2015-12-21 | 2016-05-04 | 中国科学院过程工程研究所 | Fly ash coated sludge ceramsite and preparation method therefor |
| CN106830892A (en) * | 2017-02-24 | 2017-06-13 | 浙江益壤环保科技有限公司 | It is the method that raw material prepares haydite with industrial sludge, incineration of refuse flyash and stalk |
| CN107793169A (en) * | 2017-12-20 | 2018-03-13 | 苏州市世好建材新技术工程有限公司 | A kind of manufacture method of high rigidity refractory brick |
| CN108585934A (en) * | 2018-06-25 | 2018-09-28 | 西安科技大学 | A kind of aluminium sludge ceramsite preparation method |
| CN109336552A (en) * | 2018-11-19 | 2019-02-15 | 西安建筑科技大学 | A kind of pelletizing method and system of sludge ceramsite |
| CN109678462A (en) * | 2018-12-29 | 2019-04-26 | 武汉理工大学 | A kind of Ultralight mud ceramic granules and preparation method thereof |
Non-Patent Citations (2)
| Title |
|---|
| 刘景明: "由化工脱水污泥烧制陶粒", 《北京科技大学学报》 * |
| 罗绍华: "《材料科学研究与工程技术系列丛书功能材料》", 31 December 2014 * |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114478050A (en) * | 2021-12-23 | 2022-05-13 | 王梓远 | Sludge ceramsite and preparation method thereof |
| CN114249480A (en) * | 2021-12-25 | 2022-03-29 | 江苏同禾药业有限公司 | Method for treating production wastewater of 6, 8-dichloro ethyl caprylate |
| CN114349527A (en) * | 2022-01-18 | 2022-04-15 | 大连交通大学 | Method for preparing sludge ceramsite by using domestic sludge |
| CN114956859A (en) * | 2022-05-23 | 2022-08-30 | 合肥工业大学 | Novel tap water plant sludge-biochar-based ceramsite filter material |
| CN116395727A (en) * | 2023-01-30 | 2023-07-07 | 河南理工大学 | Sludge ladder stage fraction utilization process |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN113292355A (en) | Method for preparing ceramsite by using sludge of sewage treatment plant | |
| US10894741B2 (en) | Method for preparing ceramsite by using municipal sludge as raw material | |
| CN114538850B (en) | Solid waste base lightweight aggregate based on biochar internal carbonization and preparation method thereof | |
| CN110117193B (en) | Preparation method of hydrophobic ceramsite light aggregate, hydrophobic ceramsite light aggregate prepared by method and application of hydrophobic ceramsite light aggregate | |
| CN111116210B (en) | Method for preparing light ceramsite by utilizing biological coal ecological sintering waste soil | |
| CN108821621B (en) | Light high-strength ceramsite and preparation method thereof | |
| CN105016710B (en) | The method that haydite is prepared using sludge at low temperature sintering | |
| CN113735611A (en) | Method for preparing low-shrinkage porous ceramic by high-temperature self-foaming of aluminum ash | |
| CN114105610A (en) | Aluminum ash-based porous ceramic material and preparation method thereof | |
| CN110655385A (en) | Light environment-friendly ceramsite and preparation method and application thereof | |
| CN107586102A (en) | A kind of granite waste stone dust foamed ceramics and preparation method thereof | |
| CN113735475A (en) | Light ceramsite and preparation method thereof | |
| CN112430066A (en) | Light high-strength ceramsite and preparation method and application thereof | |
| CN112552072A (en) | Construction waste regenerated foamed ceramic and preparation method thereof | |
| CN113955996B (en) | Phase-change anti-crack concrete and preparation method thereof | |
| CN105130391A (en) | Method of preparing light-weight ceramic granules by sintering lake-bottom mud and municipal sludge | |
| CN111574193A (en) | Sludge ash ceramsite filter material and preparation method thereof | |
| CN113896563B (en) | Method for preparing high-strength foamed ceramic material by using boric sludge and foamed ceramic material | |
| CN111517820A (en) | High-strength ceramsite containing sludge ash and preparation method thereof | |
| CN113004872B (en) | Composite phase-change heat storage material and preparation method thereof | |
| CN113372097A (en) | Phase-change ceramsite based on waste incineration fly ash and preparation method and application thereof | |
| CN116813369B (en) | Dangerous waste base high-strength lightweight aggregate and preparation method thereof | |
| CN112441816A (en) | Porous ceramic prepared by using plasma ball mill for low-temperature sintering and preparation method thereof | |
| CN115710136B (en) | Hollow heat-insulating ceramsite and preparation method thereof | |
| CN106747620A (en) | A kind of low energy consumption sintering seepage brick and its manufacture method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20210824 |