CN114671665A - Method for producing ceramsite sand by using sludge - Google Patents
Method for producing ceramsite sand by using sludge Download PDFInfo
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- CN114671665A CN114671665A CN202210409269.XA CN202210409269A CN114671665A CN 114671665 A CN114671665 A CN 114671665A CN 202210409269 A CN202210409269 A CN 202210409269A CN 114671665 A CN114671665 A CN 114671665A
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- 239000010802 sludge Substances 0.000 title claims abstract description 48
- 239000004576 sand Substances 0.000 title claims abstract description 46
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 28
- 239000000463 material Substances 0.000 claims abstract description 48
- 239000000843 powder Substances 0.000 claims abstract description 45
- 238000000034 method Methods 0.000 claims abstract description 21
- 239000002245 particle Substances 0.000 claims abstract description 21
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 19
- 239000000654 additive Substances 0.000 claims abstract description 18
- 238000001354 calcination Methods 0.000 claims abstract description 17
- 239000003245 coal Substances 0.000 claims abstract description 11
- 238000002156 mixing Methods 0.000 claims abstract description 10
- 238000012216 screening Methods 0.000 claims abstract description 10
- 238000002485 combustion reaction Methods 0.000 claims abstract description 8
- 239000011230 binding agent Substances 0.000 claims abstract description 4
- 230000000996 additive effect Effects 0.000 claims description 14
- 239000008188 pellet Substances 0.000 claims description 13
- 238000000227 grinding Methods 0.000 claims description 12
- 210000002257 embryonic structure Anatomy 0.000 claims description 11
- 238000001816 cooling Methods 0.000 claims description 10
- 238000001035 drying Methods 0.000 claims description 9
- 230000008569 process Effects 0.000 claims description 8
- 239000000853 adhesive Substances 0.000 claims description 7
- 230000001070 adhesive effect Effects 0.000 claims description 7
- 239000002002 slurry Substances 0.000 claims description 7
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims description 6
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims description 6
- 235000011941 Tilia x europaea Nutrition 0.000 claims description 6
- 239000004571 lime Substances 0.000 claims description 6
- 238000007873 sieving Methods 0.000 claims description 5
- 230000018044 dehydration Effects 0.000 claims description 4
- 238000006297 dehydration reaction Methods 0.000 claims description 4
- 210000001161 mammalian embryo Anatomy 0.000 claims description 4
- 238000003825 pressing Methods 0.000 claims description 4
- 238000005086 pumping Methods 0.000 claims description 3
- 239000010865 sewage Substances 0.000 claims description 3
- 238000005507 spraying Methods 0.000 claims description 3
- 238000003756 stirring Methods 0.000 claims description 3
- 238000005406 washing Methods 0.000 claims description 3
- 238000012545 processing Methods 0.000 claims description 2
- 239000008187 granular material Substances 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 7
- 238000001125 extrusion Methods 0.000 abstract description 7
- 230000035699 permeability Effects 0.000 abstract description 4
- 238000010521 absorption reaction Methods 0.000 description 6
- 238000005096 rolling process Methods 0.000 description 6
- 238000007599 discharging Methods 0.000 description 5
- 239000006185 dispersion Substances 0.000 description 4
- 229920002401 polyacrylamide Polymers 0.000 description 3
- 239000002994 raw material Substances 0.000 description 3
- 238000013461 design Methods 0.000 description 2
- 235000015076 Shorea robusta Nutrition 0.000 description 1
- 244000166071 Shorea robusta Species 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000013618 particulate matter Substances 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 230000009257 reactivity Effects 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 239000002910 solid waste 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
- C04B33/00—Clay-wares
- C04B33/02—Preparing or treating the raw materials individually or as batches
- C04B33/13—Compounding ingredients
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B1/00—Producing shaped prefabricated articles from the material
- B28B1/004—Devices for shaping artificial aggregates from ceramic mixtures or from mixtures containing hydraulic binder
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B11/00—Apparatus or processes for treating or working the shaped or preshaped articles
- B28B11/24—Apparatus or processes for treating or working the shaped or preshaped articles for curing, setting or hardening
- B28B11/243—Setting, e.g. drying, dehydrating or firing ceramic articles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B15/00—General arrangement or layout of plant ; Industrial outlines or plant installations
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B17/00—Details of, or accessories for, apparatus for shaping the material; Auxiliary measures taken in connection with such shaping
- B28B17/02—Conditioning the material prior to shaping
- B28B17/026—Conditioning ceramic materials
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B33/00—Clay-wares
- C04B33/02—Preparing or treating the raw materials individually or as batches
- C04B33/13—Compounding ingredients
- C04B33/132—Waste materials; Refuse; Residues
- C04B33/1321—Waste slurries, e.g. harbour sludge, industrial muds
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B33/00—Clay-wares
- C04B33/32—Burning methods
-
- C—CHEMISTRY; METALLURGY
- 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
- C04B38/009—Porous or hollow ceramic granular materials, e.g. microballoons
-
- 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
- C04B2235/3208—Calcium oxide or oxide-forming salts thereof, e.g. lime
-
- 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
- C04B2235/42—Non metallic elements added as constituents or additives, e.g. sulfur, phosphor, selenium or tellurium
-
- 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
- C04B2235/6567—Treatment time
-
- 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)
- Structural Engineering (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Dispersion Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Environmental & Geological Engineering (AREA)
- Treatment Of Sludge (AREA)
Abstract
The invention discloses a method for producing ceramsite sand by using sludge. The method comprises the following steps: s1 providing sludge, additives and binders; s2 mixing to obtain mud blank; s3 obtaining mud powder; s4, carrying out ball making treatment on the mud blank to obtain a ball material; s5 obtaining a calcined product; and S6, obtaining the ceramsite sand. The operation of the method for obtaining the ball material by the ball making treatment is as follows: s41 provides a disc-type ball making machine, a flowmeter, a water pump and a sieve disc; s42 putting the mud blank into a disc type ball making machine, and putting mud powder into a sieve disc; s43, turning on a power supply to prepare balls to obtain particles; s44, screening the particles to obtain the ball material. And the cooled output air directly enters the rotary kiln along the kiln head. The method has the advantages that the prepared ceramsite sand has good extrusion resistance and permeability resistance when in use, the finished product rate of ball making is high, the subsequent screening treatment is facilitated, the wind power can be utilized secondarily, the blowing-in and combustion promotion of coal powder during calcination are assisted, and the energy-saving effect in the whole production process is enhanced.
Description
Technical Field
The invention relates to the technical field of ceramsite sand production, in particular to a method for producing ceramsite sand by using sludge.
Background
The ceramsite is prepared by sintering various raw materials such as various clays, slates, shales, coal gangue and industrial solid wastes through ceramics, and is generally used for replacing broken stones and pebbles in concrete. The ceramsite sand has the advantages of low density, heat preservation and insulation, excellent impermeability, excellent alkali-resistant aggregate reactivity, low water absorption, good frost resistance and durability and the like, and is widely applied.
However, when the current ceramsite sand is produced, the pellets are stuck to each other during rolling and discharging, so that the yield of the manufactured ceramsite sand is low, the subsequent screening treatment is inconvenient, the wind power consumed during cooling and calcining the blast coal is large, the energy-saving effect in the whole production process is poor, and the manufactured ceramsite sand is easy to disperse in stress after water absorption and expansion, and has poor extrusion resistance and permeability resistance.
Disclosure of Invention
Therefore, a method for producing the ceramsite sand by using the sludge is needed to solve the problems that when the ceramsite sand is produced, pellets are adhered to each other during rolling and discharging, so that the yield of the produced pellets is low, the subsequent screening treatment is inconvenient, the wind power consumed during cooling and calcining the blast coal is large, the energy-saving effect in the whole production process is poor, the produced ceramsite sand is easy to disperse in stress after absorbing water and expanding, and the extrusion resistance and the seepage resistance are poor.
A method for producing ceramsite sand by using sludge, which is used for preparing ceramsite sand by using the sludge, and comprises the following steps:
s1, providing sludge, additives and binders;
s2, mixing and processing the sludge, the additive and the adhesive to obtain a mud blank;
s3, drying, grinding and sieving a certain amount of mud embryos to obtain mud powder for later use;
s4, performing ball making treatment on the mud blank to obtain a ball material;
the method for obtaining the ball material by the ball making treatment comprises the following operations:
s41, providing a disc type ball making machine, a flowmeter, a water pump and a sieve disc;
s42, putting the mud blank into a disc-type ball making machine, and putting the mud powder into a sieve tray;
s43, switching on a power supply, driving mud blanks in the disc-type ball making machine to rotate by the operation of the disc-type ball making machine, uniformly scattering mud powder into a ball making chamber by the sieve disc, pumping water quantified by a flowmeter into the ball making chamber by the water pump, and spraying the water into the ball making chamber to obtain particles after ball making;
s44, screening the particles to obtain a ball material;
s5, feeding the ball material into a rotary kiln for calcination treatment to obtain a calcined product;
the ball material is sent into a rotary kiln with an inclined inner part, the ball material rolls to a kiln head along with the rotation of the rotary kiln, meanwhile, the coal powder is sprayed into the kiln from the kiln head for combustion, and a calcined product is output along the kiln head;
s6, cooling the calcined product to obtain ceramsite sand;
in the process of S6, the cooled wind is directly introduced into the rotary kiln along the kiln head.
The prepared ceramsite sand has the characteristic of no dispersion after moisture absorption, has good extrusion resistance and permeability resistance when in use, can avoid mutual adhesion of ball materials during rolling and discharging, improves the finished product rate of ball making, facilitates subsequent screening treatment, adopts a mode that air output after cooling directly enters a rotary kiln along a kiln head for calcination, enables secondary utilization of wind power, assists blowing-in and combustion promotion of coal powder during calcination, and enhances the energy-saving effect in the whole production process.
In one embodiment, the sludge is taken from a sewage treatment plant; and/or the sludge is bottom sludge taken from any one place of rivers, lakes and rivers.
In one embodiment, the additive adopts lime powder or sulfur powder, which is used for adjusting the pH value of the sludge; the weight ratio of the additive is 0.3-0.6%.
Further, when the acidity of the sludge is too high, lime powder is doped; when the alkalinity of the sludge is too high, sulfur powder is doped.
In one embodiment, the method for obtaining the mud embryo by the mixing treatment comprises the following operations:
s21, washing the sludge with water, and removing coarse aggregate to obtain slurry;
s22, sequentially adding the additive and the adhesive into the slurry, and mixing and stirring to obtain a mixed material;
and S23, performing filter pressing and dehydration on the mixed material to obtain a mud blank.
In one embodiment, the manufacturing process of the mud powder comprises the following steps: selecting a certain amount of mud embryos, sending the mud embryos into a drying device for drying, then grinding the mud embryos into powder through a grinding machine, sieving the powder, repeatedly grinding the intercepted large-particle powder until the powder can be sieved out, and collecting the sieved mud powder.
In one embodiment, the pellets are classified according to the particle size of the particulate matter and are labeled as type a pellets, type B pellets, type C pellets, and type D pellets, respectively.
Further, the particle size specification of the A-type ball material is 0.45-0.9 mm; the specification particle size of the B-type ball material is 0.9-1.25 mm; the particle size specification of the C-type ball material is 1.0-1.70 mm; the D-type ball material has a particle size specification of 0.224-0.65 mm.
In one embodiment, in the calcining treatment process, the temperature is firstly increased to 150 ℃ and kept for 3-5 min, then is increased to 1150-1250 ℃ at a constant speed and kept for 3min, and then is taken out of the kiln.
In one embodiment, the calcined product enters a rotary cooler to be cooled by air cooling for 10-15 min, so that ceramsite sand is obtained.
Compared with the prior art, the invention has the beneficial effects that:
according to the invention, the raw materials of the ceramsite sand are adhered by doping the adhesive, so that the components in the ceramsite sand are mutually adhered, the ceramsite sand has the characteristic of no dispersion after moisture absorption, and the extrusion resistance and the permeation prevention performance of the ceramsite sand during use are improved.
According to the invention, the mud powder is uniformly scattered in the ball making process, so that a layer of mud powder is uniformly adhered to the surface of the blank, the balls are prevented from being adhered to each other during rolling and discharging, the ball making yield is improved, and the subsequent screening treatment is facilitated.
According to the invention, the mode that the cooled output air directly enters the rotary kiln along the kiln head for calcination is adopted, so that the wind power can be utilized secondarily, the blowing-in and combustion promotion of the coal powder during calcination are assisted, and the energy-saving effect in the whole production process is enhanced.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "or/and" includes any and all combinations of one or more of the associated listed items.
The embodiment provides a method for producing ceramsite sand by using sludge, which is used for preparing the ceramsite sand by using the sludge. The method comprises the following steps:
s1, providing sludge, additives and binders.
The sludge is taken from a sewage treatment plant, and/or the sludge is taken from bottom sludge of any place in rivers, lakes and rivers. The additive adopts lime powder or sulfur powder, which is used for adjusting the pH value of the sludge. The weight ratio of the additive is 0.3-0.6%. When the acidity of the sludge is too high, lime powder is doped for adjustment until the pH value reaches a design value, and when the alkalinity of the sludge is too high, sulfur powder is doped for adjustment until the pH value reaches the design value.
And S2, mixing the treated sludge, the additive and the adhesive to obtain a mud blank.
The weight ratio of polyacrylamide to additive is 1: 1-1.5, namely the weight ratio of the polyacrylamide is 1-1.5 times of that of the additive. In the embodiment, the raw materials for adhering the ceramsite sand by doping the polyacrylamide are used, so that the components in the ceramsite sand are adhered to each other, the ceramsite sand has the characteristic of no dispersion after moisture absorption, and the extrusion resistance and the permeation resistance of the ceramsite sand during use are improved.
The method for obtaining the mud embryo by mixing treatment comprises the following operations:
and S21, washing the sludge by water, and removing coarse aggregate to obtain the slurry.
And S22, sequentially adding the additive and the adhesive into the slurry, and mixing and stirring to obtain a mixed material.
And S23, performing filter pressing and dehydration on the mixed material to obtain a mud blank.
The mixed material is placed in a plate-and-frame filter press, and is made into a mud blank after filter pressing and dehydration.
S3, drying, grinding and sieving a certain amount of mud embryo to obtain mud powder for later use.
Selecting quantitative mud embryos, sending the mud embryos into a drying device for drying, grinding the mud embryos into powder by a rear grinding machine, repeatedly grinding the intercepted large-particle powder until the large-particle powder can be screened out when the powder is screened out, and collecting the screened-out mud powder.
And S4, performing ball making treatment on the mud blank to obtain a ball material.
The method for obtaining the ball material by the ball making treatment comprises the following operations:
s41, providing a disc type ball making machine, a flow meter, a water pump and a sieve disc.
And S42, placing the mud blank into a disc-type ball making machine, and placing mud powder into a sieve disc.
And S43, switching on a power supply, driving the mud blank in the disc type ball making machine to rotate, uniformly scattering mud powder into the ball making chamber by using the sieve disc, pumping water quantitatively by using the flow meter into the ball making chamber by using the water pump, and spraying the water into the ball making chamber to obtain particles after ball making.
In this embodiment, evenly spill the mud powder through the in-process at the system ball for the blank surface evenly adheres to there is the one deck mud powder, thereby avoids the ball material to glue each other when rolling and the ejection of compact, improves the yield of system ball, and has made things convenient for subsequent branch sieve to handle.
And S44, screening the particles to obtain a ball material.
The ball materials are respectively marked as A-type ball materials, B-type ball materials, C-type ball materials and D-type ball materials according to the particle sizes of the particles. The specification of the A-type ball material is 0.45-0.9 mm, the specification of the B-type ball material is 0.9-1.25 mm, the specification of the C-type ball material is 1.0-1.70 mm, and the specification of the D-type ball material is 0.224-0.65 mm.
S5, feeding the ball material into a rotary kiln for calcination treatment to obtain a calcined product;
the rotary kiln is provided with a certain inclination. In the calcining treatment process, the temperature is firstly increased to 150 ℃ and kept for 3-5 min, then is uniformly increased to 1150-1250 ℃ and kept for 3min, and then is taken out of the kiln. The ball material is fed into a rotary kiln with a certain inclination, the ball material rolls towards the kiln head along with the rotation of the rotary kiln, meanwhile, the coal powder is sprayed into the kiln from the kiln head for combustion, and the calcined product is output along the kiln head.
And S6, cooling the calcined product to obtain the ceramsite sand.
And (4) allowing the calcined product to enter a rotary cooler for air cooling for 10-15 min to obtain ceramsite sand. In the process of S6, the cooled wind is directly introduced into the rotary kiln along the kiln head.
In the embodiment, the mode that the cooled output air directly enters the rotary kiln along the kiln head for calcination is adopted, so that the wind power can be utilized secondarily, the blowing-in and combustion promotion of the coal powder during calcination are assisted, and the energy-saving effect in the whole production process is enhanced.
In summary, compared with the current ceramsite sand production, the method of the present embodiment has the following advantages: the ceramsite sand prepared by the method has the characteristic of no dispersion after moisture absorption, is good in extrusion resistance and permeability resistance during use, can avoid mutual adhesion of ball materials during rolling and discharging, improves the yield of ball making, facilitates subsequent screening treatment, adopts a mode that air output after cooling directly enters a rotary kiln along a kiln head for calcination, enables wind power to be secondarily utilized, assists blowing and combustion promotion of pulverized coal during calcination, and enhances the energy-saving effect in the whole production process.
All possible combinations of the technical features of the above embodiments may not be described for the sake of brevity, but should be considered as within the scope of the present disclosure as long as there is no contradiction between the combinations of the technical features.
The foregoing description is more specific and detailed, but is not to be taken as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.
Claims (10)
1. A method for producing ceramsite sand by using sludge is characterized by comprising the following steps:
s1, providing sludge, additives and binders;
s2, mixing and processing the sludge, the additive and the adhesive to obtain a mud blank;
s3, drying, grinding and sieving a certain amount of mud embryos to obtain mud powder for later use;
s4, performing ball making treatment on the mud blank to obtain a ball material;
the method for obtaining the ball material through the ball making treatment comprises the following operations:
s41, providing a disc type ball making machine, a flowmeter, a water pump and a sieve disc;
s42, putting the mud blank into a disc-type ball making machine, and putting the mud powder into a sieve tray;
s43, switching on a power supply, driving mud blanks in the disc-type ball making machine to rotate by the operation of the disc-type ball making machine, uniformly scattering mud powder into a ball making chamber by the sieve disc, pumping water quantified by a flowmeter into the ball making chamber by the water pump, and spraying the water into the ball making chamber to obtain particles after ball making;
s44, screening the particles to obtain a ball material;
s5, feeding the ball material into a rotary kiln for calcination treatment to obtain a calcined product;
the ball material is sent into a rotary kiln with an inclined inner part, the ball material rolls to a kiln head along with the rotation of the rotary kiln, meanwhile, the coal powder is sprayed into the kiln from the kiln head for combustion, and a calcined product is output along the kiln head;
s6, cooling the calcined product to obtain ceramsite sand;
in the process of S6, the cooled wind is directly introduced into the rotary kiln along the kiln head.
2. The method for producing ceramsite sand by using sludge as recited in claim 1, wherein said sludge is obtained from a sewage treatment plant;
and/or the sludge is bottom sludge taken from any one of rivers and lakes.
3. The method for producing ceramsite sand by using sludge as claimed in claim 1, wherein the additive is lime powder or sulfur powder, which is used for adjusting the pH value of the sludge; the weight ratio of the additive is 0.3-0.6%.
4. The method for producing ceramsite sand by using sludge as claimed in claim 3, wherein when the acidity of the sludge is too high, lime powder is added; when the alkalinity of the sludge is too high, sulfur powder is doped.
5. The method for producing ceramsite sand by using sludge as recited in claim 1, wherein said mixing process is performed to obtain a slurry embryo, and said method comprises the following steps:
s21, washing the sludge with water, and removing coarse aggregate to obtain slurry;
s22, sequentially adding the additive and the adhesive into the slurry, and mixing and stirring to obtain a mixed material;
and S23, performing filter pressing and dehydration on the mixed material to obtain a mud blank.
6. The method for producing ceramsite sand by using sludge as claimed in claim 1, wherein the manufacturing process of the sludge powder comprises the following steps:
selecting a certain amount of mud embryos, sending the mud embryos into a drying device for drying, then grinding the mud embryos into powder through a grinding machine, sieving the powder, repeatedly grinding the intercepted large-particle powder until the powder can be sieved out, and collecting the sieved mud powder.
7. The method for producing ceramsite sand by using sludge as recited in claim 1, wherein said pellets are classified according to the particle size of the granules and labeled as a-type pellets, B-type pellets, C-type pellets and D-type pellets, respectively.
8. The method for producing ceramsite sand by using sludge as claimed in claim 7, wherein the size specification of the A-type ball material is 0.45 mm-0.9 mm; the grain size specification of the B-type ball material is 0.9-1.25 mm; the particle size specification of the C-type ball material is 1.0 mm-1.70 mm; the grain size specification of the D-type ball material is 0.224-0.65 mm.
9. The method for producing ceramsite sand by using sludge as claimed in claim 1, wherein in the calcining treatment process, the temperature is firstly increased to 150 ℃ and kept for 3-5 min, and then is increased to 1150-1250 ℃ at a constant speed and kept for 3min, and then the ceramsite sand is taken out of the kiln.
10. The method for producing ceramsite sand by using sludge as claimed in claim 1, wherein the calcined product is subjected to air cooling in a rotary cooler for 10-15 min to obtain ceramsite sand.
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