CN104129972B - Process for producing sintered brick by using ultrahigh-content fly ash - Google Patents
Process for producing sintered brick by using ultrahigh-content fly ash Download PDFInfo
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- CN104129972B CN104129972B CN201410352207.5A CN201410352207A CN104129972B CN 104129972 B CN104129972 B CN 104129972B CN 201410352207 A CN201410352207 A CN 201410352207A CN 104129972 B CN104129972 B CN 104129972B
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
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Abstract
The invention provides a process for producing a sintered brick by using ultrahigh-content fly ash. The invention optimally selects the granularity gradation of the shale powder, introduces a single-layer drying process system capable of realizing large-scale continuous production, solves the problems of low stacking strength and easy deformation in the drying process of the ultrahigh-doping-amount fly ash sintered brick, further improves the stability of the product through multiple processes of stirring, forced mixing, roasting and heat preservation time prolonging and the like, successfully realizes the large-scale industrial production of the ultrahigh-doping-amount fly ash, has high yield and excellent strength of the obtained sintered brick, further reduces the weight, and effectively reduces the sintering energy consumption. The invention adopts the kiln top and the hanging structure made of the sintered refractory material, improves the acid corrosion resistance of the kiln body, can effectively adapt to the production of the fly ash sintered brick with high sulfur content and high carbon content, solves the problem that the fly ash of the circulating fluidized bed power plant is difficult to utilize, and improves the resource utilization rate.
Description
Technical field
The present invention relates to a kind of production technology of building clinker, particularly a kind of superelevation is mixedThe technique that amount flyash is produced fired brick.
Background technology
For a long time, the leading products of China's heavy clay industry are solid clay bricks always, clay brickPreparation exist problems such as damaging environment, production coal consumption height. And the fine coal being produced by thermal power plantAsh annual emissions is high, piles up and takes up an area more than 100 ten thousand mu, pollutes very serious. And utilize flyashThe like waste is made building brick, be development energy-conservation, save land, profit is useless, insulation, heat insulation newThe main direction of type materials for wall. Meanwhile, Properties of CFB is as a kind of resource-conservingUnit, can effectively utilize the low-calorie energy, but meanwhile, the fine coal of its generationAsh is that a kind of carbon content is higher, is difficult to the waste residue being utilized by cement, non-sintered article. How highVolume, effectively utilize fly ash in electric power plant, especially Properties of CFB flyash, alwaysIt is a technical difficult problem.
While making coal ash sintering brick, the homogenizing of material is most important for the quality of brick body, itsThe prerequisite of middle homogenizing is the refinement of bonding base-material. Traditional handicraft generally adopts hammer mill, cageFormula disintegrating machine, high speed fine cracking double roller machine carry out fragmentation to binding agent material such as shale, and fineness is generally controlledBuilt in below 3 millimeters. Use the shale powder of this granularity, the volume general control of flyash existsBelow 25wt%, otherwise by the product percent of pass that is difficult to reach satisfied, product strength is affected,Because doping quantity of fly ash is low, roasting process is also wanted artificial outer more fat coal, the energy thrown simultaneouslyConsumption is high. And while adopting higher doping quantity of fly ash, the wet base intensity of coal ash sintering brick is low,Dry shrink greatly, residual moisture is large, causes under traditional process conditions, wet base is very easily out of shape,Cracking, intensity is low, and yield rate is not high. And under traditional working condition, use from power plantThe flyash of high sulfur content time, large to the corrosion infringement on sintering oven kiln top, the maintenance of kiln body andUpkeep cost is high, is unsuitable for long-term large-scale industrial production.
Therefore, for efficiently utilizing the especially a large amount of fine coal from recirculating fluidized bed power plant of flyashAsh, provides the building of environmental protection to wipe material, still needs the further selection to material, Yi JixiangThe techniques such as the batch mixing of answering, dry, moulding, sintering are improved.
Summary of the invention
For overcoming the defect of traditional coal ash sintering brick manufacture craft, Improving The Quality of Products and propertyCan, applicant is through studying for a long period of time, proposed superelevation dosage flyash sintered brick of the present inventionProduction technology, it comprises raw material preparation, batch mixing, ageing, moulding, dry and calcination steps,Wherein:
Described raw material preparation process comprises: shale is sent into disintegrating machine and carry out fragmentation, then send intoThe further micronization processes of flour mill, the granularity of the shale powder after micronization processes below 2mm,Wherein the particle below 1mm at least accounts for 80wt%; Prepare flyash according to certain proportion scaleWith the shale powder after micronization processes, described proportion scale is that flyash accounts for flyash and refinement placeThe gross weight of the shale powder after reason be 62-78wt%;
Described drying steps comprises: adopt large cross-section tunnel formula individual layer hothouse to be dried, becomeThe adobe of type individual layer in hothouse is piled up, and between adobe, nothing laminates, the wind pushing temperature of hothouseBe 110～130 DEG C, be 36 to 48 hours drying time;
Described calcination steps comprises: in large cross-section tunnel kiln, carry out, firing temperature is1050-1100 DEG C, whole roasting time is 42-50 hour.
Further, the disintegrating machine in described raw material preparation process is hammer mill or high-speed fineIn broken twin rollers any, flour mill is pendulum type ring roll pulverizer. Preferably, after described micronization processesShale powder in, granularity is less than the 35-45wt% that accounts for of 0.25mm.
By the operation of grinding again after fragmentation, can effectively reduce on the one hand shale powder granularity,And promote the particle size uniformity of particle; On the other hand, after grinding, in shale powder particleSharp-pointed corner is ground off, and major part presents subglobose shape. Under same granularity, ballGrating between shape particle and flyash is better, and the bonding skeleton structure forming evenly, by forceSpend, be conducive to the realization of superelevation content fly ash. In addition the surface of tiny spheric granules,Activity is high, is more conducive to the carrying out of sintering process, can reduce sintering energy consumption, and is also conducive to burnThe raising of knotting strength. And controlling in grain composition, through repetition test, find only to need pageThe granularity of rock dust is below 2mm, and wherein the particle below 1mm at least accounts for 80wt%, grainDegree is less than the 35-45wt% that accounts for of 0.25mm, and just can reach good effect, and needn't mistakeCarefully, otherwise can cause very large equipment cost and refinement to manage required power consumption everywhere.
Further, described batch mixing step comprises: according to the proportion scale in raw material preparation process,Shale powder after flyash and micronization processes is sent into bar type batch mixer, carry out mixed processing; MixedAfter closing evenly, send in first biaxial rneader, add normal-temperature water and stir; StirAfter, send in second biaxial rneader total with the shale powder after flyash and micronization processesWeighing scale adds more than 80 DEG C hot water or the water vapour of 13-20wt% to stir.
By batch mixing-stirring-stir again, can effectively improve the uniformity of mixing raw materials, makeBe distributed in flyash to shale powder uniform particles, be conducive to the raising of moulding and sintering strength.In addition, can also be by repeating step 2-3 time that above-mentioned batch mixing-stirring-again stirs, furtherImprove compounding effect. Digestion time after batch mixing is preferably more than 72 hours. To the one-tenth of adobeType preferably adopts two-stage vacuum extruder for blocks extrusion molding, and extrusion pressure is 2.5～3.5MPa,The vacuum of extruder is-0.15Mpa～-0.09Mpa that the mud bar so obtaining is closely knit and surperficialBright and clean, obtain product quality more excellent.
Further, in described drying steps, adopt tower blower that dry-heat air is sent into dryChamber, and by the finger-like fork truck of automated handling loading system control, the adobe of moulding is piled up to dryOn dry car; On described drying cart, be fixedly installed multiple layer tray, on every layer of pallet, only pile up individual layerAdobe, the distance between adjacent two layers pallet is at least 1.5 times of the adobe height piled up; TreatAfter being dried, unload by the finger-like fork truck of automated handling loading system control.
Traditional drying chamber is piled up for laminating, is adopted and send air-heater to send heat, and base substrate is yielding, dryEfficiency is lower, effect is poor, qualification rate is lower. The present invention's employing is fixedly installed multiple layer trayDrying cart, has realized in enormous quantities, individual layer drying process, with traditional tunnel drying cell structure phaseThan, between base substrate, laminate without any, significantly improve dry contact-making surface, thoroughly eliminateBecause adding flyash that plasticity is lower to laminate the risk of distortion; The tower blower simultaneously adopting willDrying medium is sent into hothouse, forms strong side direction perturbation and circulation, has significantly improved dryEffect. In addition, adopt Large Criss-section Tunnel Dryer, be conducive to dry gas between the adobeFully flow, and contribute to the homogenising in temperature field, further improved dry mass. AdoptAbove-mentioned drying process, dry qualification rate is that more than 99% (traditional drying chamber is used traditional raw material to closeLattice rate is only 85% to 90%), show as residual moisture low, be only 2～4% (traditional dryingsChamber residual moisture is 6～8%).
Kiln top and the hanging of the large cross-section tunnel kiln further, using in described calcination steps adoptT-shaped sintered refractory block structure, section width is 6.4-7.0m, is preferably 6.9m, and described inComprise calcination steps first stage intensification, second stage heat up and insulation operation. First stageHeating process is to be warming up to first stage intensification end temp, institute with the speed of 35-40 DEG C/hStating first stage intensification end temp is 600 DEG C-650 DEG C, and second stage heating process is fromOne-phase intensification end temp is warming up to firing temperature with the speed of 70～90 DEG C/h, insulation workOrder is for keeping constant temperature until roasting finishes at firing temperature.
Traditional tunnel cave top, generally adopts " Cathode life furred ceiling ", its heat-resisting waterIn mud, contain higher alkalescence, and flyash, especially circulating fluid bed coal ash sulfur content isHeight, can produce sour gas in sintering process, very easily destroys heat resistance concrete ceiling structure, withThe kiln roof construction of Shi Chuantong adopts heat resisting steel suspension hook, also poor for sour corrosion defense.
The present invention uses T-shaped hanging firebrick structure. T-shaped hanging structure adopts the T designingType refractory material, transfers to refractory factory mould molding sintering on request to make High-Alumina TType refractory brick, then it is upper to be fixed on secondary beam (H beam) by heat resisting steel structure, a square formation formula of formationTunnel kiln top, the space between it and on composite construction, adopt a certain amount of commonType alumina silicate fiber felt, volcano rock wool, etc. sealing and covering, forms a complete kiln top and tiesStructure. This kiln roof construction directly contacts flame by refractory brick, not only high temperature resistant, has also solved anti-The problem that corrosive problem and thermal stress discharge. Its acidity for flyash has extremely strong exempting fromEpidemic disease power, in the service life of significantly having improved tunnel cave, is particularly suitable for flyash doping amount in raw materialHigher situation, can accomplish substantially non-maintaining, efficiently solve conventional tunnel kiln acid resistance low,Safeguard the defects such as frequent, maintenance cost is high.
In the present invention, also temperature-rise period is carried out to the control becoming more meticulous, by accurate segmentation controlHeat up and sintering circuit, make volatilization matter the obtaining effectively under controlled speed in base substrateGet rid of, and make temperature field distribution and the variation of adobe inside in temperature-rise period more even, haveEffect has reduced sintering warpage and contraction situation, has further improved yield rate and product intensity.
In addition,, in raw material of the present invention, can also further add gangue composition.
Such scheme of the present invention, can, for manufacturing porous brick, hollow brick, also can be used forManufacture solid brick.
Generally, the present invention is optimized selection by the granularity grating to shale powder, drawsEnter can large-scale continuous production individual layer drying process system, solved superelevation content fly ashThe problem of structure and strength stability in the dry run of fired brick, and pass through repeatedly to stir,The technical process such as Forced Mixing, heat stepwise insulation, have further improved the stable of product structureProperty, successfully realize superelevation content fly ash large-scale industrial production, obtain the one-tenth of fired brickProduct rate is high, excellent strength, and weight further alleviates, and has effectively reduced sintering energy consumption simultaneously,And improved preparation efficiency, thus be conducive to the further promotion and application of coal ash sintering brick,Have industry application and market value.
Brief description of the drawings
Fig. 1 tunnel type individual layer hothouse generalized section.
1-moisture-eliminating blower, the 2-heat pipe of blowing, the tower blower of 3-, the 4-masonry of blowing, 5-is dryCar.
Detailed description of the invention
Embodiment 1:
Get the raw materials ready by weight:
Name of material weight portion
62 parts, flyash
38 parts of hard shales
Hard shale is sent into fragmentation in hammer mill, then send into pendulum type ring roll pulverizer and enterStep refining processing, the granularity of the shale powder after micronization processes below 2mm, wherein 1mmFollowing particle accounts for 82wt%, and the particle below 0.25mm accounts for 35wt%. By flyash andShale powder after levigate is sent to sends into bar type batch mixer, carries out mixed processing; After mixing,Send in first biaxial rneader, add normal-temperature water and stir; After stirring, send intoIn two road biaxial rneaders, in the gross weight of the shale powder after flyash and micronization processes, addThe hot water that enters 90 degree of 15wt% stirs.
Afterwards, the material after stirring is sent into the ageing of ageing storehouse more than 72 hours. Ageing is goodMaterial by two-stage vacuum extruder for blocks extrusion molding, extrusion pressure is 3.5MPa, extruderVacuum be-0.15Mpa.
The adobe of moulding is sent into large cross-section tunnel formula individual layer hothouse dry, be specially by finger-likeFork truck is put to being fixedly installed on the drying cart 5 of multiple layer tray, only piles up individual layer on every layer of palletAdobe is treated. Air-supply heat pipe 2 connects tower blower 3 and air-supply masonry 4. Adopt tower air-supplyDevice 3 is sent into hot blast in hothouse, and air temperature is 125 DEG C, and be 40 hours drying time,Dried remaining moisture content is 2.5wt%. The hot blast that tower blower 3 is sent tunnel cave hereDeliver to the hothouse bottom, reach the effect of abundant heat exchange. The humid air producing after dry willMoisture-eliminating blower 1 by hothouse afterbody is discharged. Drying cart 5 adopts Multi-layer bracket formula drying cart 5,Every one deck bracket is only placed one deck product, laminate without any, has evaded that powdered coal ash makesWet base intensity is low, easy because laminating the problem of distortion.
After being dried, unload by the finger-like fork truck of automated handling loading system control,And adobe is sent into section width is that the large cross-section tunnel kiln of 6.9m carries out roasting. First withThe speed of 35 DEG C/hour heats up most 620 DEG C, is warming up to afterwards with the speed of 85 DEG C of hour1050 DEG C and in the insulation of this temperature, whole roasting time is 48 hours. Nature after roasting completesCooling, obtain superelevation dosage flyash sintered brick of the present invention.
Embodiment 2:
Get the raw materials ready by weight:
Name of material weight portion
65 parts, flyash
35 parts of hard shales
Hard shale is sent into fragmentation in hammer mill, then send into pendulum type ring roll pulverizer and enterStep refining processing, the granularity of the shale powder after micronization processes is below 1.8mm, whereinParticle below 1.5mm accounts for 85wt%, and the particle below 0.25mm accounts for 40wt%. By powderCoal ash and levigate after shale powder send into bar type batch mixer, carry out mixed processing; After mixing,Send in first biaxial rneader, add normal-temperature water and stir; After stirring, send intoIn two road biaxial rneaders, in the gross weight of the shale powder after flyash and micronization processes, addEntering 18% water or water vapour stirs.
Afterwards, the material after stirring is sent into the ageing of ageing storehouse more than 72 hours. Ageing is goodMaterial by two-stage vacuum extruder for blocks extrusion molding, extrusion pressure is 3MPa, extruderVacuum is-0.1Mpa.
The adobe of moulding is sent into large cross-section tunnel formula individual layer hothouse dry, be specially by finger-likeFork truck is put to being fixedly installed on the drying cart 5 of multiple layer tray, only piles up individual layer on every layer of palletAdobe is treated. Air-supply heat pipe 2 connects tower blower 3 and air-supply masonry 4. Adopt tower air-supplyDevice 3 is sent into hot blast in hothouse, and air temperature is 115 DEG C, and be 48 hours drying time,After dry, remaining moisture content is 2.2wt%. The hot blast that tower blower 3 is sent tunnel cave here sendTo the hothouse bottom, reach the effect of abundant heat exchange. The humid air producing after dry will be byThe moisture-eliminating blower 1 of hothouse afterbody is discharged. Drying cart 5 adopts Multi-layer bracket formula drying cart 5,Every one deck bracket is only placed one deck product, laminate without any, has evaded that powdered coal ash makesWet base intensity is low, easy because laminating the problem of distortion.
After being dried, it is that the large cross-section tunnel kiln of 6.9m carries out that adobe is sent into section widthRoasting. First heat up most 600 DEG C with the speed of 38 DEG C/hour, afterwards with 90 DEG C/hour'sSpeed is warming up to 1100 DEG C and in the insulation of this temperature, and whole roasting time is 44 hours. RoastingNaturally cooling after completing, obtain superelevation dosage flyash sintered brick of the present invention.
Embodiment 3:
Get the raw materials ready by weight:
Name of material weight portion
70 parts, flyash
30 parts of clays
All the other production technologies are identical with embodiment 1, and difference is only to use high speed fine cracking double roller machineCarry out the fragmentation of clay, and firing temperature is set in to 1080 DEG C
Embodiment 4:
Get the raw materials ready by weight:
Name of material weight portion
72 parts, flyash
28 parts of hard shales
All the other production technologies are identical with embodiment 1, and difference is only that the wind pushing temperature of hothouse is128 DEG C, be 38 hours drying time, and firing temperature is set in to 1070 DEG C
Embodiment 5:
According to the production technology of embodiment 2, difference is only to carry out in accordance with the following steps roasting:Heat up most 650 DEG C with the speed of 40 DEG C/hour, be warming up to the speed of 70 DEG C/hour afterwards1100 DEG C and in the insulation of this temperature, whole roasting time is 42 hours. Nature after roasting completesCooling, obtain superelevation dosage flyash sintered brick of the present invention.
Above-described embodiment does not form the protection restriction to this technical scheme, for thisThe those of ordinary skill of bright described technical field, without departing from the inventive concept of the premise,Can also make some simple deduction or replace, all should be considered as belonging to protection scope of the present invention.
Claims (6)
1. a preparation method for coal ash sintering brick, comprises raw material preparation, batch mixing, ageing, moulding, dry and calcination steps, it is characterized in that:
Described raw material preparation process comprises: shale is sent into disintegrating machine and carry out fragmentation, then send into the further micronization processes of flour mill, the granularity of the shale powder after micronization processes is below 2mm, and wherein the particle below 1mm at least accounts for 80wt%, and granularity is less than the 35-45wt% that accounts for of 0.25mm; Prepare the shale powder after flyash and micronization processes according to certain proportion scale, described proportion scale is that flyash accounts for the 62-78wt% of the gross weight of the shale powder after flyash and micronization processes;
Described batch mixing step comprises: according to the proportion scale in raw material preparation process, the shale powder after flyash and micronization processes is sent into bar type batch mixer, carry out mixed processing; After mixing, send in first biaxial rneader, add normal-temperature water and stir; After stirring, send in second biaxial rneader, in the gross weight of the shale powder after flyash and micronization processes, add 13-20wt% water vapour to stir;
Described drying steps comprises: adopt large cross-section tunnel formula individual layer hothouse to be dried, the adobe of moulding individual layer in hothouse is piled up, and between adobe, without laminating, the wind pushing temperature of hothouse is 110～130 DEG C, and be 36 to 48 hours drying time; Adopt tower blower that dry-heat air is sent in hothouse; Finger-like fork truck by the control of automated handling loading system is piled up the adobe of moulding to drying cart; On described drying cart, be fixedly installed multiple layer tray, only pile up individual layer adobe on every layer of pallet, the distance between adjacent two layers pallet is at least 1.5 times of the adobe height piled up; After to be dried completing, unload by the finger-like fork truck of automated handling loading system control;
Described calcination steps comprises: in large cross-section tunnel kiln, carry out, firing temperature is 1050-1100 DEG C, whole roasting time is 42-50 hour, and kiln top and the hanging of described large cross-section tunnel kiln adopt T-shaped sintered refractory block structure, and the section width of described large cross-section tunnel kiln is 6.4-7.0m.
2. preparation method claimed in claim 1, is characterized in that, the disintegrating machine in described raw material preparation process be in hammer mill, high speed fine cracking double roller machine any, flour mill is pendulum type ring roll pulverizer.
3. preparation method claimed in claim 1, is characterized in that, described digestion time is more than 72 hours.
4. preparation method claimed in claim 1, is characterized in that, described forming step adopts two-stage vacuum extruder for blocks extrusion molding, and extrusion pressure is 2.5～3.5MPa, and the vacuum of extruder is-0.15Mpa～-0.09Mpa.
5. preparation method claimed in claim 1, is characterized in that, the section width of described large cross-section tunnel kiln is 6.9m.
6. preparation method claimed in claim 5, is characterized in that, described calcination steps comprises that first stage intensification, second stage heat up and insulation operation, wherein:
First stage heating process is to be warming up to first stage intensification end temp with the speed of 35-40 DEG C/h, and described first stage intensification end temp is 600 DEG C-650 DEG C;
Second stage heating process is to be warming up to firing temperature from first stage intensification end temp with the speed of 70～90 DEG C/h;
Insulation operation is for keeping constant temperature until roasting finishes at firing temperature.
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| CN201410352207.5A CN104129972B (en) | 2014-07-23 | 2014-07-23 | Process for producing sintered brick by using ultrahigh-content fly ash |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107879726B (en) * | 2017-12-05 | 2021-03-02 | 洛阳理工学院 | Preparation method of fly ash sintered brick |
| CN109665816A (en) * | 2019-02-20 | 2019-04-23 | 梅州市梅县区金蔡建材厂 | A kind of sintering heat-reserving brick and preparation method thereof |
| CN110577407A (en) * | 2019-09-19 | 2019-12-17 | 孟津青城古建制品有限公司 | Method for controlling sintering curve of antique city wall brick |
| CN111978096B (en) * | 2020-08-17 | 2022-05-31 | 浙江天地环保科技股份有限公司 | Fly ash-based ceramic water permeable brick sintered by two-step method and preparation method thereof |
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| CN1246460A (en) * | 1999-10-08 | 2000-03-08 | 山东省济宁鲁西实业总公司 | Technology for sintering bricks containing high content of powdered coal ash and coal gangue as binder |
| CN1260336A (en) * | 2000-01-20 | 2000-07-19 | 王凤年 | Production technique for high-dosage flyash sintered brick |
| CN1339415A (en) * | 2000-08-22 | 2002-03-13 | 日照绿卡经贸有限责任公司 | High strength flyash brick and its preparing method |
| CN1654401A (en) * | 2004-09-15 | 2005-08-17 | 贾守富 | Process for producing clinker brick by using fly ash shale |
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| CN1246460A (en) * | 1999-10-08 | 2000-03-08 | 山东省济宁鲁西实业总公司 | Technology for sintering bricks containing high content of powdered coal ash and coal gangue as binder |
| CN1260336A (en) * | 2000-01-20 | 2000-07-19 | 王凤年 | Production technique for high-dosage flyash sintered brick |
| CN1339415A (en) * | 2000-08-22 | 2002-03-13 | 日照绿卡经贸有限责任公司 | High strength flyash brick and its preparing method |
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