CN210796253U - Industrial production system of sludge autoclaved brick - Google Patents
Industrial production system of sludge autoclaved brick Download PDFInfo
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- CN210796253U CN210796253U CN201920582758.9U CN201920582758U CN210796253U CN 210796253 U CN210796253 U CN 210796253U CN 201920582758 U CN201920582758 U CN 201920582758U CN 210796253 U CN210796253 U CN 210796253U
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Images
Classifications
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
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- Treatment Of Sludge (AREA)
Abstract
The utility model discloses an industrial production system of mud autoclaved brick, include: the device comprises a first mixing and stirring device, a sludge deep dehydration device, a raw material coarse crushing device, a sludge powdering device, a raw material middle crushing device, a raw material fine crushing device, a second mixing and stirring device, a digestion device, a third mixing and stirring device, a wheel grinding device, a press forming device, a static maintenance device and an autoclaved maintenance device. The utility model discloses a system, to sludge dewatering efficient and energy consumption low, with low costs, land area is few, usable multiple solid waste, mud doping amount is high, and friendly to the environment, and odorless and harmful gas produce in the production process. The produced sludge autoclaved brick has good strength.
Description
Technical Field
The utility model relates to an industrial production system of mud autoclaved brick belongs to mud utilization technical field.
Background
The sludge refers to solid, semi-liquid and liquid wastes generated by sewage treatment plants, generally has a water content of about 80 percent, and contains a large amount of organic matters and a certain amount of heavy metals, viruses, pathogens, parasitic ova and other harmful substances. How to reasonably solve the world problem of sludge treatment and disposal and achieve the treatment targets of reduction, stabilization, harmlessness and reclamation becomes a problem which needs to be solved urgently in society.
At present, the sludge treatment and disposal in China mainly have the following process directions, and each process direction has advantages and disadvantages: firstly, drying incineration is adopted, the reduction and stabilization of the process are obvious, but the investment is large, the operation cost is high, and dioxin can be generated under the condition of irregular flue gas treatment; secondly, aerobic composting is adopted, the process is more in application, but the problem that heavy metals exceed the standard exists, the fertilizer can only be used for landscaping, the occupied area is large, the problem of odor pollution exists, and site selection is difficult; thirdly, anaerobic digestion, the process is applied more abroad, but the operation efficiency is low due to the low organic matter content of domestic sludge, and a plurality of projects are in a shutdown state after construction; and fourthly, landfill is carried out after deep dehydration, the process has small investment and low operation cost, is more applied in recent years, but has the problem of secondary pollution, and only embodies reduction and stabilization of sludge treatment without harmlessness and reclamation.
In view of the disadvantages and problems of the above disposal methods and the urgent need of sludge treatment, the methods for preparing building materials by using sludge have been endless in recent years, especially the method for producing bricks by using sludge, and many related patents and applications have been granted and applied in recent years, but careful study will find that many methods are in laboratory stage, and once applied to practical industrial production, it will be found that: firstly, due to the gelatinous property of the sludge, a large amount of sludge with the water content of 80 wt% or sludge cakes with the water content of 30-60 wt% after deep dehydration or heat drying is very difficult to be uniformly mixed with other raw materials, sludge agglomeration often occurs, so that the strength 'weak point' in a brick blank is caused, and the produced brick has the phenomena of small sludge mixing amount, unstable quality, poor strength, unwilling use of brick units and poor market prospect; and secondly, in the sludge dehydration step, if the deep dehydration process is used, only the water content is dehydrated to 40-60 wt%, and if the heat drying process is used, the energy consumption is high, and a large amount of odor is generated in the operation process.
The above background disclosure is only provided to aid understanding of the inventive concepts and solutions of the present invention, and it does not necessarily pertain to the prior art of this patent application, and it should not be used to assess the novelty and inventive step of this application without explicit evidence to suggest that such matter has been disclosed at the filing date of this patent application.
SUMMERY OF THE UTILITY MODEL
The utility model discloses a main aim at overcomes prior art's the aforesaid is not enough, provides a sludge autoclaved brick's industrialization production system, and this system uses solid waste to make the sludge autoclaved brick of high strength, high sludge mixing volume as the main raw materials to sludge dewatering is efficient and the energy consumption is low, with low costs, area is few, usable multiple solid waste, and sludge mixing volume is high, and friendly to the environment, and odorless and harmful gas produce in the production process.
In order to achieve the above purpose, the utility model provides a following technical scheme:
an industrial production system of sludge autoclaved bricks comprises a first mixing and stirring device, a sludge deep dehydration device, a raw material coarse crushing device, a sludge powdering device, a raw material middle crushing device, a raw material fine crushing device, a second mixing and stirring device, a digestion device, a third mixing and stirring device, a wheel rolling device, a press forming device, a static curing device and an autoclaved curing device;
the first mixing and stirring device is used for conditioning and modifying sludge, namely: mixing sludge with FeCl3Mixing and stirring with quicklime;
the sludge deep dehydration device is used for carrying out filter-pressing dehydration on the modified sludge so as to reduce the water content of the sludge to be below 40-60 wt%;
the raw material coarse crushing device is used for coarsely crushing the sludge subjected to filter pressing dehydration to obtain sludge particles with the particle size of 5-30 mm; also used for the coarse crushing operation in the preparation process of the calcareous raw materials and the preparation process of the aggregate;
the sludge powdering device is used for further drying and crushing the sludge particles which are coarsely crushed and naturally dried and have the water content of 30-50 wt% and the particle size of 5-30 mm to obtain sludge dry powder with the particle size of 100-200 meshes and the water content of 10-15 wt%;
the raw material fine crushing device is used for finely crushing the coarse crushed calcareous raw materials in the preparation process of the calcareous raw materials to obtain the calcareous raw materials with the particle size of 100-200 meshes;
the raw material crushing device is used for performing medium crushing on the coarsely crushed aggregate in the aggregate preparation process to obtain the aggregate with the particle size of 0.05-100 mm;
the second mixing and stirring device is used for carrying out first mixing of raw materials, and the first mixing is as follows: mixing the prepared siliceous raw material, the calcareous raw material, the aggregate and the additive in proportion with water, and uniformly stirring; wherein the mass part ratio of the siliceous raw material, the calcareous raw material, the aggregate and the additive is 20-120: 6-23: 10-50: 0-3, and the added water accounts for 5-20 wt% of the total weight of the mixture mixed for the first time;
the digestion device is used for carrying out digestion reaction on the material stirred by the second mixing and stirring device;
the third mixing and stirring device is used for carrying out the second mixing of the raw materials, and the second mixing is that: adding cement and water into the material obtained by the digestion reaction, mixing and uniformly stirring; wherein the amount of the added cement and the amount of the added water are respectively 0-20 wt% and 0-20 wt% of the total amount of the mixture of the second mixing; wherein, the adding amount of cement and water is controlled according to the strength requirement of the brick;
the wheel milling device is used for performing wheel milling on the material stirred by the third mixing and stirring device so as to discharge air in the material;
the press forming device is used for press forming the blank obtained after the wheel is rolled and milled to obtain a brick blank;
the static maintenance device is used for performing static maintenance on the green bricks;
and the autoclaved curing device is used for carrying out autoclaved curing on the green bricks which are subjected to the static curing so as to obtain finished sludge autoclaved bricks.
Compared with the prior art, the utility model discloses the above-mentioned industrial production system who provides mud autoclaved brick has following advantage:
1) the sludge dry powder with the particle size of 100-200 meshes and the water content of 10-15 wt% prepared by the sludge powder making device can greatly increase the specific surface area of the sludge in the raw materials so as to fully perform hydration reaction with the calcareous raw materials to generate hydration products, thereby greatly increasing the using amount of the sludge; the device does not need a heat source, and crushing and drying are completed at the same time, so that the investment cost and energy consumption are greatly reduced compared with that of a heat drying device, and no odor or harmful gas is generated;
2) according to the material characteristics of the raw materials, a coarse crushing device, a medium crushing device and a fine crushing device are reasonably selected, so that the energy consumption of the industrial production system is the lowest;
3) the high-temperature high-pressure steam curing device is adopted, so that the hydration reaction is strengthened, the effects of disinfection, sterilization and deodorization are achieved, living cells, pathogenic microorganisms and the like in sludge are effectively killed, the investment cost is greatly reduced compared with the traditional sintering process equipment tunnel kiln, the energy consumption is lower, odor and harmful gases cannot be generated, the process flow time is greatly shortened, the occupied area is greatly reduced, and the high-temperature high-pressure steam curing device is particularly important at present when the land is increasingly short.
Drawings
FIG. 1 is a production flow chart of the industrial production system of the sludge autoclaved brick of the present invention.
Detailed Description
The present invention will be further described with reference to the accompanying drawings and specific embodiments.
The utility model discloses a concrete embodiment provides an industrial production system of sludge autoclaved brick to various mud such as life, industry make the sludge autoclaved brick of high strength, high mud mixing volume as the main materials. The sludge adopted in the utility model can be, for example, domestic sewage sludge, printing and dyeing sludge, papermaking sludge, heavy metal sludge, industrial wastewater sludge, water supply sludge and the like.
Referring to fig. 1, an industrial production system of sludge autoclaved blocks includes: first mixing and stirringThe device, the deep dehydration device of mud, the coarse crushing device of raw materials, mud make powder device, the garrulous device in raw materials, the fine crushing device of raw materials, second mixing stirring device, digestion device, third mixing stirring device, wheel device, press forming device, quiet maintenance device and evaporate and press the maintenance device. The first, second and third mixing and stirring devices are all mixers, such as forced mixers, twin-shaft mixers, etc., as long as the devices in the field can mix and stir raw materials, and the first mixing and stirring device is used for conditioning and modifying sludge, namely: mixing sludge with FeCl3Mixing with quicklime. The sludge deep dehydration device is a membrane filter press or a high-pressure plate-and-frame filter press, and is used for performing filter-pressing dehydration on the modified sludge so as to reduce the water content of the sludge to 40-60 wt%. The raw material coarse crushing device can be a jaw crusher or an impact crusher, and any equipment capable of performing raw material coarse crushing in the field can be used for performing coarse crushing on the sludge subjected to filter pressing dehydration to obtain sludge particles with the particle size of 5-30 mm; also used for the coarse crushing operation in the preparation process of the calcareous raw materials and the preparation process of the aggregate. The sludge powdering device is used for further drying and crushing the sludge particles which are coarsely crushed and naturally dried and have the water content of 30-50 wt% and the particle size of 5-30 mm to obtain the sludge dry powder with the particle size of 100-200 meshes and the water content of 10-15 wt%. The raw material fine-crushing device can be, for example, a ball mill, a rod mill, a Raymond mill or the like, any equipment capable of finely crushing raw materials in the field can be used for finely crushing the coarse-crushed calcareous raw materials in the preparation process of the calcareous raw materials so as to obtain the calcareous raw materials with the particle size of 100-200 meshes. The raw material intermediate crushing device can be, for example, a hammer crusher, a cone crusher, a roller crusher or the like, any equipment capable of performing intermediate crushing of raw materials in the field can be used for performing intermediate crushing on coarsely crushed aggregates in the aggregate preparation process to obtain aggregates with the particle size of 0.05-100 mm. The second mixing and stirring device is used for carrying out first mixing of the raw materials, and the first mixing is as follows: taking the prepared siliceous raw material, the calcareous raw material, the aggregate and the additive in proportion and adding water as a first batch of material, and uniformly mixing and stirring in a second mixing and stirring device; wherein,the mass part ratio of the siliceous raw material to the calcareous raw material to the aggregate to the additive is 20-120: 6-23: 10-50: 0-3, and the added water amount is 5-20 wt% of the total amount of the mixture mixed for the first time. And the digestion device, namely the digestion bin, is used for carrying out digestion reaction on the material stirred by the second mixing and stirring device. The third mixing and stirring device is used for carrying out the second mixing of the raw materials, and the second mixing is that: adding cement and water into the material obtained by the digestion reaction to serve as a second batch of material, and mixing and uniformly stirring the materials in a third mixing and stirring device; the amount of the added cement and the amount of the added water are respectively 0-20 wt% and 0-20 wt% of the total amount of the mixture mixed for the second time, and the control is required according to the strength requirement of the brick, for example, when the current material reaches the brick making strength requirement, the step does not need to add cement and water. And the wheel milling device, namely the wheel mill, is used for performing wheel milling on the material stirred by the third mixing and stirring device so as to discharge most of air in the material. A press-forming apparatus such as a full-automatic hydraulic brick press is used to press-form a blank obtained after wheel milling to obtain a green brick. And the static maintenance device is a static maintenance line and is used for performing static maintenance on the green bricks. And the autoclaved curing device such as an autoclave is used for carrying out autoclaved curing on the green bricks subjected to the static curing so as to obtain finished sludge autoclaved bricks. The conveying of the raw materials among the devices of the system can adopt a belt conveyor.
With continued reference to FIG. 1, the process of producing sludge autoclaved blocks by the system of the present invention comprises: preparing a siliceous raw material, a calcareous raw material, an aggregate and an additive; mixing the raw materials for the first time; carrying out digestion reaction on raw materials; mixing the raw materials for the second time; grinding by using a wheel; pressing and forming; standing and maintaining; and (5) steam pressure curing.
Preparation of siliceous raw material: the siliceous raw material comprises sludge dry powder, fly ash and a certain amount of high silicon material. The preparation process of the sludge dry powder comprises the following steps: deep dehydration of sludge: adding FeCl into the sludge3And quicklime, stirring in the first mixing and stirring device (such as forced stirrer and double-shaft stirrer) to condition and modify sludge, and pumping the modified sludge to the sludge deep dehydration device (such as membrane filter press or high-pressure plate-and-frame filter press) for filter pressing and dehydrationWater, so that the water content of the sludge is reduced to 40-60 wt%; sludge crushing and drying: crushing the sludge after deep dehydration into particles with the particle size of 5-30 mm by using the raw material coarse crushing device (such as a jaw crusher and an impact crusher), and naturally drying for several days to reduce the water content by 10-20 wt%; sludge powdering: and conveying the sludge particles obtained by crushing and drying into a sludge powdering device integrating drying and crushing by using a belt conveyor, and simultaneously drying and crushing to obtain sludge dry powder with the water content of 10-15 wt% and the particle size of 100-200 meshes. Wherein, the membrane filter press adopted during the deep dehydration of the sludge can dehydrate the modified sludge to the water content of 50wt percent to 60wt percent, and the high-pressure plate-and-frame filter press can dehydrate the modified sludge to the water content of 40wt percent to 50wt percent. The drying and crushing integrated machine used in sludge powdering can adopt industrial automatic production equipment for dehydrating sludge into dry sludge powder as disclosed in the utility model with the patent number of 200820110960.3; or the crushing and drying integrated machine with the patent application number of 201920071500.2 can simultaneously complete further drying and crushing of sludge particles to obtain the sludge dry powder, and the crushing and drying integrated machine does not need a heat source, so that the energy consumption is greatly saved.
Conveying the fly ash into a storage bin by using a screw conveyor for standby; according to SiO in the sludge dry powder and the fly ash2The content and the dosage proportion need to be supplemented with a certain amount of high silicon material (SiO)2Content higher than 60 wt%), such as river sand/river sand, it is fed into a raw material fine-crushing device such as a ball mill, and pulverized into powder with particle size of about 100 meshes, and is fed into a bin by a screw conveyor for standby.
Preparing a calcareous raw material: adopting one of quicklime and carbide slag and gypsum; wherein the quick lime or the carbide slag is 5-20 parts by weight, and the gypsum is 1-3 parts by weight. When the calcareous raw material is prepared, the calcareous raw material is sent into a raw material coarse crushing device (such as a jaw crusher and a back-impact crusher) and a raw material fine crushing device (such as a ball mill, a rod mill or a Raymond mill) in sequence, and is crushed into powder with the particle size of about 100 meshes (such as 100-200 meshes) for later use; the calcareous material may also include a suitable amount of cement such as portland cement under the designation po42.5.
Preparation of aggregate: when the crushing device is used, one or more of various solid wastes such as construction wastes, furnace slag, water granulated slag, coal gangue, steel slag and the like are crushed by a raw material coarse crushing device (such as a jaw crusher and an impact crusher) and a raw material medium crushing device (such as a hammer crusher, a cone crusher or a roller crusher) in sequence until the particle size is 0.05-10 mm for later use.
Preparation of the additive: one or more of an excitant, a water reducing agent, a reinforcing agent and an early strength agent are selected, and the additives are prepared for later use due to less dosage.
First mixing of raw materials: after the required raw materials are prepared, the first mixing of the raw materials can be carried out in the second mixing and stirring device (such as a forced mixer or a double-shaft mixer): mixing the prepared siliceous raw material, the calcareous raw material, the aggregate and the additive in proportion with water, and uniformly stirring; wherein the mass part ratio of the siliceous raw material, the calcareous raw material, the aggregate and the additive is 20-120: 6-23: 10-50: 0-3, and the added water amount is 5-20 wt% of the total amount of the mixture mixed for the first time. In a specific embodiment, the following mass portion ratios can be adopted: the weight portion ratio of the sludge dry powder to the fly ash to the river sand or the river sand to the lime or the carbide slag to the gypsum to the aggregate to the additive is 10-50: 0-20: 5-20: 1-3: 10-50: 0-3.
The raw materials which are uniformly mixed and stirred for the first time are sent into a digestion device, namely a digestion bin, by a belt conveyor to carry out digestion reaction, wherein the digestion time is preferably 0.5-12 hours. And then, respectively conveying the materials after the digestion reaction, cement and water into a third mixing and stirring device (such as a forced stirrer or a double-shaft stirrer) by using a conveyor to carry out secondary mixing of the raw materials, wherein the amount of the cement and the water added is 0-20 wt% and 0-20 wt% of the total amount of the mixture of the secondary mixing respectively, and the stirring time is 3-5 min. Wherein, the adding amount of the cement and the water is controlled according to the strength requirement of the brick during the second mixing of the raw materials, for example, if the current raw materials reach the strength requirement of the brick, the cement and the water can be mixed without adding.
And then, conveying the materials obtained after the secondary mixing into a wheel milling device, namely a wheel mill, by using a belt conveyor for wheel milling, so that most of air in the materials is removed, and the activity and homogenization degree of the mixture are improved, thereby being beneficial to forming of the brick blank, wherein the wheel milling time is 5-10 min.
And (3) carrying out press forming after the wheel milling is finished, and conveying the blank subjected to the wheel milling to a press forming device (such as a full-automatic hydraulic brick press) by a belt conveyor for press forming, wherein the forming pressure is 10-35 MPa. Thereby obtaining green bricks. And (3) loading the formed brick blanks to a steam curing trolley from a stacking machine, and pushing the brick blanks to a static curing device, namely a static curing line, by a light rail for static curing, wherein the static curing time is 3-50 hours.
And finally, the steam curing trolley filled with the statically stopped brick blanks is pulled into a steam curing device such as a still kettle by a winch or a tractor to perform steam curing, the steam pressure of the steam curing is 0.1-2.3 MPa, the steam temperature is 100-220 ℃, the curing time is 4-15 hours, the effective proceeding of hydration reaction is ensured, and steam is provided by a steam boiler in the still kettle. And (4) finishing the autoclaved curing to obtain a finished sludge autoclaved brick, drawing the autoclaved trolley out of the autoclave by a winch or a tractor, and stacking the autoclaved trolley in a finished product stacking yard by using a brick unloading machine.
The system provided by the present invention is described in terms of workflow and validation of beneficial effects by several embodiments.
Example 1
1) Preparation of siliceous raw material:
1.1) deep dehydration of sludge: metering municipal sewage sludge with water content of 80 wt% in a storage bin, pumping the municipal sewage sludge to a forced mixer, and sequentially adding 1 wt% of FeCl3Mixing with 2 wt% of quicklime, stirring uniformly, conditioning, modifying, pumping to a membrane filter press, performing filter pressing dehydration, and dehydrating to obtain a mud cake with the water content of 60 wt%; wherein FeCl is added3And the content of quicklime respectively accounts for sludge and FeCl3And 1 wt% and 2 wt% of the total amount of quicklime.
1.2) sludge crushing and drying: coarsely crushing the deeply dehydrated mud cakes into particles of 5-30 mm by using a jaw crusher, and naturally air-drying for 1 day, wherein the water content is further reduced by about 10 wt% to obtain sludge particles with the water content of 50 wt%;
1.3) sludge powdering: conveying sludge particles with the particle size of 5-30 mm and the water content of 50 wt% after natural air drying into industrial automatic production equipment of sludge dry powder obtained by dehydrating sludge with the patent number of 200820110960.3 by using a belt conveyor, further drying and crushing to obtain sludge dry powder with the particle size of 100 meshes and the water content of 15 wt%, and conveying the prepared sludge dry powder into a storage bin for later use by using a screw conveyor;
1.4) conveying the fly ash into a storage bin by a screw conveyor for standby;
1.5) according to SiO in the sludge dry powder and the fly ash2The content and the dosage proportion (shown in table 1) need to be supplemented with a certain amount of high silicon material river sand, the river sand is sent into a ball mill by a belt conveyor and is crushed into powder with the particle size of about 100 meshes, and the powder is sent into a storage bin by a screw conveyor for standby;
TABLE 1 main chemical composition of siliceous raw Material (wt%)
| Raw materials | SiO2 | CaO | Al2O3 | Fe2O3 | MgO | P2O5 | Loss on ignition |
| Sludge dry powder | 35.26 | 1.57 | 16.75 | 9.78 | 1.26 | 0.37 | 13.25 |
| Fly ash | 52.37 | 2.98 | 25.67 | 7.72 | 1.13 | 0.26 | 4.15 |
| River sand | 76.56 | 3.57 | 10.66 | 5.12 | 1.55 | 0.35 |
2) Preparing a calcareous raw material:
2.1) feeding quicklime blocks and gypsum blocks into a jaw crusher and a ball mill respectively by a belt conveyor, crushing the quicklime blocks and the gypsum blocks into powder with the particle size of about 100 meshes, and feeding the powder into respective bins by screw conveyors respectively for standby;
2.2) delivering the ordinary Portland cement marked Po42.5 into a silo by a screw conveyor for standby.
3) Preparation of aggregate: the construction waste is sent into a jaw crusher and a hammer crusher by a belt conveyor in sequence to be crushed into particles with the particle size of 0.05-10 mm, and then the particles are sent into a storage yard by the belt conveyor for standby.
4) Preparation of the additive: taking sodium hydroxide as an excitant and sodium chloride as an early strength agent, and preparing the excitant and the early strength agent for later use.
5) First mixing of raw materials: taking 15 wt% of sludge dry powder, 35 wt% of fly ash, 10 wt% of river sand, 8 wt% of lime, 2 wt% of gypsum, 29.9 wt% of aggregate and 0.1 wt% of additive (0.05 wt% of each of sodium hydroxide and sodium chloride) according to the proportion, and respectively feeding the materials into a forced mixer by using a conveyor. Then, 15 wt% of water is added and stirred uniformly for 5 min. The mass fraction of water here is the mass fraction based on the total mass of the mixture which is first mixed (i.e. after addition of water).
6) Digestion: and (3) conveying the mixture obtained by the first mixing into a digestion bin by using a belt conveyor for digestion reaction, wherein the digestion time is 5 hours.
7) And (3) mixing the raw materials for the second time: and (3) conveying the digested mixture into a forced mixer by using a conveyor, adding 5 wt% of cement and 12 wt% of water, and uniformly mixing for 5 min. The proportions of the cement and water added are based on the total mass of the mixture (i.e., after the addition of water and cement) mixed at this time.
8) Grinding by using a wheel: and (4) conveying the mixture uniformly mixed and stirred in the second time into an edge runner mill by using a belt conveyor for edge runner milling for 10 min.
9) And (3) pressing and forming: and (3) conveying the blank rolled by the wheel rolling machine to a full-automatic hydraulic brick press by a belt conveyor for press forming, wherein the forming pressure is 20 MPa.
10) Standing and maintaining: and (3) loading the formed brick blanks to a steam curing trolley from a stacking machine, and pushing the brick blanks to a static line by a light rail for static curing, wherein the static curing time is 6 hours.
11) Steam pressure curing: and (3) pulling the steam curing trolley filled with the statically stopped brick blanks into the autoclave by a winch or a tractor for steam curing, wherein the steam pressure of the steam curing is 1.3MPa, the steam temperature is 180 ℃, and the curing time is 11 hours.
And (3) performing inspection test on 80 parts of the prepared sludge autoclaved brick to obtain: the average compressive strength is 21.89Mpa, the average flexural strength is 5.21Mpa, the average compressive strength after a freeze-thaw test is 20.9Mpa, the dry mass loss is 0.2-1.1%, and the requirements of MU20 high-class products in GB11945-1999 autoclaved sand-lime brick are met.
Example 2
1) Preparation of siliceous raw material:
1.1) deep dehydration of sludge: metering municipal sewage sludge with water content of 80 wt% in a storage bin, pumping the municipal sewage sludge to a double-shaft stirrer, and sequentially adding 1 wt% of FeCl3Mixing with 2 wt% of quicklime, stirring uniformly, conditioning, modifying, pumping to a membrane filter press, performing filter pressing dehydration, and dehydrating to obtain a mud cake with the water content of 60 wt%; wherein FeCl is added3And the content of quicklime respectively accounts for sludge and FeCl3And 1 wt% and 2 wt% of the total amount of quicklime.
1.2) sludge crushing and drying: coarsely crushing the deeply dehydrated mud cake into particles of 5-30 mm by using an impact crusher, and naturally air-drying for 3 days, wherein the water content is further reduced by about 15 wt% to obtain sludge particles with the water content of 45 wt%;
1.3) sludge powdering: conveying the sludge particles with the particle size of 5-30 mm and the water content of 45 wt% after natural air drying into a crushing and drying integrated machine with the patent application number of 201920071500.2 by using a belt conveyor, further drying and crushing to obtain sludge dry powder with the particle size of 100 meshes and the water content of 12 wt%, and conveying the prepared sludge dry powder into a storage bin by using a spiral conveyor for later use;
1.4) conveying the fly ash into a storage bin by a screw conveyor for standby;
1.5) according to SiO in the sludge dry powder and the fly ash2The content and the dosage proportion (shown in table 2) need to be supplemented with a certain amount of high silicon material river sand, the river sand is sent into a rod mill by a belt conveyor and is crushed into powder with the particle size of about 100 meshes, and the powder is sent into a storage bin by a screw conveyor for standby;
TABLE 2 main chemical composition (wt%) of siliceous material
| Raw materials | SiO2 | CaO | Al2O3 | Fe2O3 | MgO | P2O5 | Loss on ignition |
| Sludge dry powder | 35.26 | 1.57 | 16.75 | 9.78 | 1.26 | 0.37 | 13.25 |
| Fly ash | 52.37 | 2.98 | 25.67 | 7.72 | 1.13 | 0.26 | 4.15 |
| River sand | 76.56 | 3.57 | 10.66 | 5.12 | 1.55 | 0.35 |
2) Preparing a calcareous raw material:
2.1) feeding quicklime blocks and gypsum blocks into a reaction crusher and a rod mill respectively by a belt conveyor, crushing the quicklime blocks and the gypsum blocks into powder with the particle size of about 100 meshes, and feeding the powder into respective bins by screw conveyors respectively for standby;
2.2) delivering the ordinary Portland cement marked Po42.5 into a silo by a screw conveyor for standby.
3) Preparation of aggregate: the construction waste is sent into a reaction crusher and a cone crusher successively by a belt conveyor to be crushed into particles with the particle size of 0.05-10 mm, and then the particles are sent into a storage yard by the belt conveyor for standby.
4) Preparation of the additive: taking sodium hydroxide serving as an exciting agent and polyvinyl alcohol serving as a reinforcing agent, and preparing the sodium hydroxide and the polyvinyl alcohol serving as a reinforcing agent for later use.
5) First mixing of raw materials: taking 25 wt% of sludge dry powder, 25 wt% of fly ash, 15 wt% of river sand, 8 wt% of lime, 2 wt% of gypsum, 24.9 wt% of aggregate and 0.1 wt% of additive (0.05 wt% of each of sodium hydroxide and polyvinyl alcohol) according to the proportion, and respectively feeding the mixture into a double-shaft stirrer by using a conveyor. Then, 15 wt% of water is added and stirred uniformly for 5 min. The mass fraction of water here is the mass fraction based on the total mass of the mixture which is first mixed (i.e. after addition of water).
6) Digestion: and (3) conveying the mixture obtained by the first mixing into a digestion bin by using a belt conveyor for digestion reaction, wherein the digestion time is 5 hours.
7) And (3) mixing the raw materials for the second time: and (3) conveying the digested mixture into a double-shaft stirrer by using a conveyor, adding 5 wt% of cement and 12 wt% of water, and uniformly stirring for 5 min. The proportions of the cement and water added are based on the total mass of the mixture (i.e., after the addition of water and cement) mixed at this time.
8) Grinding by using a wheel: and (4) conveying the mixture uniformly mixed and stirred in the second time into an edge runner mill by using a belt conveyor for edge runner milling for 10 min.
9) And (3) pressing and forming: and (3) conveying the blank rolled by the wheel rolling machine to a full-automatic hydraulic brick press by a belt conveyor for press forming, wherein the forming pressure is 20 MPa.
10) Standing and maintaining: and (3) loading the formed brick blanks to a steam curing trolley from a stacking machine, and pushing the brick blanks to a static line by a light rail for static curing, wherein the static curing time is 6 hours.
11) Steam pressure curing: and (3) pulling the steam curing trolley filled with the statically stopped brick blanks into the autoclave by a winch or a tractor for steam curing, wherein the steam pressure of the steam curing is 1.3MPa, the steam temperature is 180 ℃, and the curing time is 11 hours.
And (3) performing inspection test on 80 parts of the prepared sludge autoclaved brick to obtain: the average compressive strength is 16.79Mpa, the average flexural strength is 4.51Mpa, the average compressive strength after a freeze-thaw test is 15.9Mpa, the dry mass loss is 0.3-0.9%, and the requirements of MU15 high-class products in GB11945-1999 autoclaved sand-lime brick are met.
Example 3
1) Preparation of siliceous raw material:
1.1) deep dehydration of sludge: metering municipal sewage sludge with water content of 80 wt% in a storage bin, pumping the municipal sewage sludge to a forced mixer, and sequentially adding 1 wt% of FeCl3Mixing with 2 wt% of quicklime, stirring uniformly, conditioning, modifying, pumping to a membrane filter press, performing filter pressing dehydration, and dehydrating to obtain a mud cake with the water content of 60 wt%; wherein FeCl is added3And the content of quicklime respectively accounts for sludge and FeCl3And 1 wt% and 2 wt% of the total amount of quicklime.
1.2) sludge crushing and drying: coarsely crushing the deeply dehydrated mud cakes into particles of 5-30 mm by using a jaw crusher, and naturally air-drying for 3 days, wherein the water content is further reduced by about 15 wt% to obtain sludge particles with the water content of 45 wt%;
1.3) sludge powdering: conveying the sludge particles with the particle size of 5-30 mm and the water content of 45 wt% after natural air drying into a crushing and drying integrated machine with the patent application number of 201920071500.2 by using a belt conveyor, further drying and crushing to obtain sludge dry powder with the particle size of 100 meshes and the water content of 12 wt%, and conveying the prepared sludge dry powder into a storage bin by using a spiral conveyor for later use;
1.4) conveying the fly ash into a storage bin by a screw conveyor for standby;
1.5) according to SiO in the sludge dry powder and the fly ash2The content and dosage proportion (see table 2), need to supplement a certain amount of high silicon material river sand, send it into Raymond mill with the belt conveyor and pulverize to the powder with particle size of about 100 meshes and send into the feed bin with the screw conveyor for subsequent use;
TABLE 2 main chemical composition (wt%) of siliceous material
2) Preparing a calcareous raw material:
2.1) feeding quicklime blocks and gypsum blocks into a jaw crusher and a Raymond mill respectively by a belt conveyor, crushing the quicklime blocks and the gypsum blocks into powder with the particle size of about 100 meshes, and feeding the powder into respective bins by screw conveyors for standby;
2.2) delivering the ordinary Portland cement marked Po42.5 into a silo by a screw conveyor for standby.
3) Preparation of aggregate: the construction waste is sent into a jaw crusher and a roller crusher by a belt conveyor in sequence to be crushed into particles with the particle size of 0.05-10 mm, and then the particles are sent into a storage yard by the belt conveyor for standby.
4) Preparation of the additive: taking sodium hydroxide serving as an exciting agent and polyvinyl alcohol serving as a reinforcing agent, and preparing the sodium hydroxide and the polyvinyl alcohol serving as a reinforcing agent for later use.
5) First mixing of raw materials: taking 25 wt% of sludge dry powder, 20 wt% of fly ash, 15 wt% of river sand, 13 wt% of lime, 2 wt% of gypsum, 24.9 wt% of aggregate and 0.1 wt% of additive (0.05 wt% of each of sodium hydroxide and polyvinyl alcohol) according to the proportion, and respectively feeding the mixture into a forced mixer by using a conveyor. Then, 15 wt% of water is added and stirred uniformly for 5 min. The mass fraction of water here is the mass fraction based on the total mass of the mixture which is first mixed (i.e. after addition of water).
6) Digestion: and (3) conveying the mixture obtained by the first mixing into a digestion bin by using a belt conveyor for digestion reaction, wherein the digestion time is 5 hours.
7) And (3) mixing the raw materials for the second time: and (3) conveying the digested mixture into a forced mixer by using a conveyor, adding 5 wt% of cement and 12 wt% of water, and uniformly mixing for 5 min. The proportions of the cement and water added are based on the total mass of the mixture (i.e., after the addition of water and cement) mixed at this time.
8) Grinding by using a wheel: and (4) conveying the mixture uniformly mixed and stirred in the second time into an edge runner mill by using a belt conveyor for edge runner milling for 10 min.
9) And (3) pressing and forming: and (3) conveying the blank rolled by the wheel rolling machine to a full-automatic hydraulic brick press by a belt conveyor for press forming, wherein the forming pressure is 20 MPa.
10) Standing and maintaining: and (3) loading the formed brick blanks to a steam curing trolley from a stacking machine, and pushing the brick blanks to a static line by a light rail for static curing, wherein the static curing time is 6 hours.
11) Steam pressure curing: and (3) pulling the steam curing trolley filled with the statically stopped brick blanks into the autoclave by a winch or a tractor for steam curing, wherein the steam pressure of the steam curing is 1.3MPa, the steam temperature is 180 ℃, and the curing time is 11 hours.
And (3) performing inspection test on 80 parts of the prepared sludge autoclaved brick to obtain: the average compressive strength is 15.89Mpa, the average flexural strength is 4.12Mpa, the average compressive strength after a freeze-thaw test is 15.19Mpa, the dry mass loss is 0.5-1.2%, and the requirements of MU15 high-class products in GB11945-1999 autoclaved sand-lime brick are met.
The foregoing is a more detailed description of the present invention, taken in conjunction with the specific preferred embodiments thereof, and it is not intended that the invention be limited to the specific embodiments shown and described. To the technical field of the utility model belongs to the prerequisite of not deviating from the utility model discloses, can also make a plurality of equal substitution or obvious variants, performance or usage are the same moreover, all should regard as belonging to the utility model's scope of protection.
Claims (8)
1. An industrial production system of sludge autoclaved bricks is characterized by comprising a first mixing and stirring device, a sludge deep dehydration device, a raw material coarse crushing device, a sludge powder making device, a raw material middle crushing device, a raw material fine crushing device, a second mixing and stirring device, a digestion device, a third mixing and stirring device, a wheel rolling device, a press forming device, a static curing device and an autoclaved curing device;
the first mixing and stirring device is used for conditioning and modifying the sludge;
the deep sludge dewatering device is used for performing filter-pressing dewatering on the modified sludge so as to reduce the water content of the sludge to 40-60 wt%;
the raw material coarse crushing device is used for coarsely crushing the sludge subjected to filter pressing dehydration to obtain sludge particles with the particle size of 5-30 mm; also used for the coarse crushing operation in the preparation process of the calcareous raw materials and the preparation process of the aggregate;
the sludge powdering device is used for further drying and crushing the sludge particles which are coarsely crushed and naturally dried and have the water content of 30-50 wt% and the particle size of 5-30 mm to obtain sludge dry powder with the particle size of 100-200 meshes and the water content of 10-15 wt%;
the raw material fine crushing device is used for finely crushing the coarse crushed calcareous raw materials in the preparation process of the calcareous raw materials to obtain the calcareous raw materials with the particle size of 100-200 meshes;
the raw material crushing device is used for performing medium crushing on the coarsely crushed aggregate in the aggregate preparation process to obtain the aggregate with the particle size of 0.05-100 mm;
the second mixing and stirring device is used for mixing the first batch of materials;
the digestion device is used for carrying out digestion reaction on the material stirred by the second mixing and stirring device;
the third mixing and stirring device is used for mixing a second batch of materials;
the wheel milling device is used for performing wheel milling on the material stirred by the third mixing and stirring device so as to discharge air in the material;
the press forming device is used for press forming the blank obtained after the wheel is rolled and milled to obtain a brick blank;
the static maintenance device is used for performing static maintenance on the green bricks;
and the autoclaved curing device is used for carrying out autoclaved curing on the green bricks which are subjected to the static curing so as to obtain finished sludge autoclaved bricks.
2. The system for industrially producing sludge autoclaved bricks according to claim 1, wherein the first mixing and stirring device, the second mixing and stirring device and the third mixing and stirring device comprise a forced mixer or a biaxial mixer.
3. The system for industrially producing sludge autoclaved blocks as claimed in claim 1, wherein the sludge deep dehydration means comprises a membrane filter press or a high-pressure plate and frame filter press.
4. The system for industrially producing sludge autoclaved bricks according to claim 1, wherein the raw material coarsely crushing apparatus comprises a jaw crusher or an impact crusher.
5. The system of claim 1, wherein the means for breaking the material comprises a hammer mill, a cone mill, or a roller mill.
6. The system for industrially producing a sludge autoclaved brick as claimed in claim 1, wherein the raw material fine crushing device comprises a ball mill, a rod mill or a Raymond mill.
7. The system for industrially producing sludge autoclaved bricks according to claim 1, wherein the press molding device is a fully automatic hydraulic brick press.
8. The system for industrially producing sludge autoclaved bricks according to claim 1, wherein the autoclave curing device is an autoclave.
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