CN104230372A - Process for manufacturing autoclaved aerated concrete block - Google Patents

Process for manufacturing autoclaved aerated concrete block Download PDF

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Publication number
CN104230372A
CN104230372A CN201410418306.9A CN201410418306A CN104230372A CN 104230372 A CN104230372 A CN 104230372A CN 201410418306 A CN201410418306 A CN 201410418306A CN 104230372 A CN104230372 A CN 104230372A
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milling
wet
grinding
slip
lime
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杨承秀
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CHAOHU GALAXY NEW BUILDING MATERIAL Co Ltd
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CHAOHU GALAXY NEW BUILDING MATERIAL Co Ltd
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Abstract

The invention relates to a process for manufacturing an autoclaved aerated concrete block and belongs to the technical field of building block manufacturing. A main process flow can be divided into working procedures, namely raw material treatment and slurry preparation, material proportioning, stirred casting molding, standing and cutting, autoclaved-curing, formwork removing, processing and packaging. The process has the beneficial effects that the process is simple, the proportioning ratio is precise, manufactured bricks are light in unit volume weight and good in heat insulation performance, and the sound insulation performance, the permeation resistance, the fire resistance and the building block body strength are all relatively good, so that the process is environment-friendly and resource-saving.

Description

Autoclaved aerated concrete blocks manufacturing process
Technical field:
The present invention relates to autoclaved aerated concrete blocks manufacturing process, belong to building block manufacturing technology field.
Background technology:
Autoclave aerated concrete building block adds aluminium powder in the batching with calcareous material (as cement, lime) and siliceous material (as sand, flyash, slag) to make air entraining agent, through the stirring that adds water, casting, expansion of getting angry, precuring cutting, then through the porous silicate building block of autoclave curing.
The unit weight of autoclave aerated concrete building block is 1/3rd of clay brick, and heat-insulating property is 3-4 times of clay brick, and sound-proofing properties is 2 times of clay brick, and anti-permeability performance is more than one times of clay brick, and fire performance is 6-8 times of Steel Concrete.The masonry strength of building block is about 80% of building block self-strength.
The construction property of autoclave aerated concrete building block is also very excellent, it not only can produce all size in factory, and can also carry out sawing as timber, dig, bore, follow closely, the volume ratio again due to it is larger, therefore speed of application also quickly, can be used as the packing material of various building.
Summary of the invention:
Technical problem to be solved by this invention is the defect overcoming prior art, provides a kind of autoclaved aerated concrete blocks manufacturing process.
Technical problem to be solved by this invention realizes by the following technical solutions.
Autoclaved aerated concrete blocks manufacturing process, is characterized in that: technical process can be divided into: raw material disposal and Pulp preparation, batching, stirring casting, quietly to stop and cutting, steam press maintenance, form removal, processing and packaging process, is specially:
1) raw-material process and Pulp preparation
Raw material disposal and Pulp preparation comprise lumpy material fragmentation, levigate and pulping process link:
1. the fragmentation of lumpy material:
The fragmentation of lumpy material mainly refers to the fragmentation of unslaked lime and the plaster of paris, uses jaw crusher and hammer mill, Particle size requirements < 15mm after broken.
2. lumpy material is levigate:
Saccharoid levigate, is generally divided into single-material dry grinding, single-material wet-milling, the dry grinding of two or more material mixing and Wet blend-milling, single siliceous material to add calcic useless slurry wet-milling five kinds of grinding processes.
Dry mill process and processing parameter
Dry method mix grinding mainly contains two kinds, and a kind of is that gypsum is added lime by the requirement of processing compound is jointly levigate, but during gypsum lime mix grinding, should note the cooling of grinding machine or take other preventive measures, high and dehydration forms semi-hydrated gypsum with temperature in abrasionproof; Another kind is that part flyash and calcareous material are cooperatively levigate, can prevent lime from " sticking with paste mill " phenomenon occurring, improve mill efficiency, can obtain functional epoxy glue ramming material.
Dry mill process parameter:
Go out the fineness of grind materials.It is 5 ~ 15% that single material gypsum, lime dry grind that general 0.08mm tails over, and mix grinding technique specific surface 4000 ~ 6000cm2/g or 0.063mm square hole sieve more than 15 ~ 5%.
Wet-grinding technology and relative device and processing parameter:
Wet-grinding technology and relative device major equipment is ball mill and mortar pump, slip basin.Ball mill is identical with dry method.Circulating tank after siliceous material is levigate at least should arrange two.The pulp quality of mix grinding is determined with fineness and concentration usually.Grinding machine work should grasp the granularity of material, color, foreign matter content and active situation at any time, adjusts in time according to need of production and determination data to feeding capacity and amount of water.
The wet-milling of single-material is applicable to sand, slag, flyash, and mixed wetmilling process mainly contains the Wet blend-milling of sand and lime, siliceous material adds calcareous material wet-milling, the Wet blend-milling of powder ash air-entrained concrete, hydro-thermal ball-milling technology.
Wet-milling processing parameter:
Slurry density is required to be 1.60 ~ 1.75kg/L, fineness 2800 ~ 3200cm2/g; Slag slurry requires at 2500 ~ 2800cm2/g, and density is at 1.5 ~ 1.65kg/L; To flyash slip fineness requirement 2800 ~ 3200cm2/g, density 1.60 ~ 1.75kg/L.
3. Pulp preparation
When sand or flyash are when adding water levigate, also complete pulping process simultaneously.Adopting when reaching the wet-discharged coal ash of fineness requirement also can the levigate and direct slurrying without flyash.The slurrying of dry powder coal ash, can by the feeding machine of bottom of the reservior after humidification stirrer be tentatively humidified, and feeding pulping agitator and water stir, and make the coal ash pulp meeting concentration requirement.The concentration of general production control slip is about 65%.
The preparation of liquid material and aluminium powder suspension
In order to make aluminium powder more easily be uniformly dispersed in whipping process, generally in advance aluminium powder cream is prepared into suspension.Aluminium powder suspension is formed by aluminium powder cream, grease-removing agent or suds-stabilizing agent 50 ~ 60 DEG C of hot water stirs.
2) prepare burden:
Cement 6-15%, lime 18-25%, flyash 65-70%, gypsum 3-5%, aluminium powder cream 0.07-0.08%, ratio of water to material 0.60-0.65, teeming temperature 36-40 DEG C, aluminium powder churning time 30-40s.
3) casting is stirred:
Stir pouring forming technology main Types
Stirring casting is divided into stirring cast to get angry and two stages of setting and harden.The previous stage is added in special stirrer by the program of process stipulation by the material measured at burden process to be prepared into slip, and inject mould and make its expansion of getting angry, and the latter half leaves standstill sclerosis under the envrionment conditions of processing requirement, forms base substrate.
Base substrate just supports technique:
Gas concrete slip is got angry and is expanded and leave standstill sclerosis in mould, is commonly referred to base substrate and just supports, and its facility comprises and quietly stops mould table, just supports room, just supports tunnel and just support roller-way.
Stir casting process parameters:
Cast slip optimal temperature: fly ash aeroconcretes: 36 ~ 40 DEG C
Sand Aerated Concrete: 35-38 DEG C
Cement-slag-sand: 40 ~ 45 DEG C
The denseness of slip: diffusibleness 18-20cm.
Get angry the time: 15-20 minute,
Stir the feeding sequence of gas concrete slip:
The feeding sequence of stirrer is generally followed and is first thrown pasty material and water, then throws pulverulent material, finally throws the principle of subsidiary material and material of getting angry.The churning time of slip and powder is 1 ~ 2min; The churning time of cement and mixed slurry is 2 ~ 4min; Alkali lye stirs 0.33 ~ 1min; Aluminium powder stirs 0.25 ~ 1min.Wherein, cement is reinforced unsuitable too fast, about needs lasting 1min.
4) quietly to stop:
Length between the quiet stopping time is relevant with the quiet envrionment temperature height stopped, and envrionment temperature is high, short between the quiet stopping time.Generally quiet envrionment temperature of stopping is not less than 20 DEG C, is advisable with 40-50.
The hardening index that base substrate is just supported, can cut plastic strength to weigh, is advisable with 0.045-0.08Mpa.When temperature is 50 DEG C, be 1.5 ~ 2.5h between the quiet stopping time of Aerated concrete blank.
5) cut.
6) steam press maintenance:
Maintenance pressure is 1.0 ~ 1.2MPa, and still pressure should be guaranteed supply slightly larger than 1.0 ~ 1.2MPa saturation steam in boiler house.Suitable vacuum tightness is-0.06 ~-0.07MPa, and vacuum pumping rate makes gauge pressure in still reach-0.06MPa with 30 ~ 50min.Heating-up time general 120-180min.。
7) form removal.
8) goods processing and repairing:
Process by craft or machinery, manipulative device has channeling device, plane hornwork, cork drill, handsaw.Machining equipment is sheet material milling and grinding machine and building block processing machine mainly.
Goods are repaired:
Some macroscopic irregularity of gas concrete, as long as no reaching the degree affecting structure properties and result of use, comprising losing fangle, surface damage etc. that the size that only affects outward appearance is little, generally can recover by repairing.Patching material is filled a prescription: cement 20%; The plaster of Paris 20%; Gas concrete powder (getting from milling and grinding machine dust-precipitator) 60%, repairing should be carried out in indoor, and winter is antifreeze.
9) packaging of building block.
Beneficial effect of the present invention is: technique is simple, and proportioning is accurate, and the fragment of brick unit weight of making is light, good heat insulating, and the masonry strength of sound-proofing properties, anti-permeability performance, fire performance and building block is all better, and environmental protection, economizes on resources.
Embodiment:
The technique means realized to make the present invention, creation characteristic, reaching object and effect is easy to understand, below in conjunction with specific embodiment, setting forth the present invention further.
The production of autoclaved aerated concrete blocks need determine different production technique according to the operational characteristic etc. of starting material classification, quality, major equipment, generally, technical process can be divided into: raw material disposal and Pulp preparation, batching, stirring casting, quietly to stop and the operations such as cutting, steam press maintenance, form removal, processing and packaging.
1. raw-material process and Pulp preparation
Raw material disposal and Pulp preparation comprise the process procedures such as lumpy material fragmentation, levigate and slurrying.Some enterprises may also have the operation workshop sections such as the dehydration of lime calcining, wet-discharged coal ash.
(1) fragmentation of lumpy material:
The fragmentation of lumpy material mainly refers to the fragmentation of unslaked lime and the plaster of paris.Aerated Concrete industry mainly uses jaw crusher and hammer mill, Particle size requirements < 15mm after broken.
(2) material is levigate
Saccharoid levigate, is generally divided into single-material dry grinding, single-material wet-milling, the dry grinding of two or more material mixing and Wet blend-milling, single siliceous material to add calcic useless slurry wet-milling five kinds of grinding processes.
1) dry mill process and processing parameter
Raw-material dry grinding, is applicable to various material in principle, but easily produces mine dust pollution.Sand and the many not easily dried materials of moisture content should adopt wet-milling.
Grinding machine adopts ball mill or energy-saving ball mill mostly, also has and adopts high pressure mill (Raymond mill).
The dry grinding of the dry grinding of single-material mainly lime and gypsum.But dry grinding efficiency is not high.In order to improve grinding efficiency and quality of material, can take to add grinding aid, mix grinding, spraying grinding aid, spray the technical measures such as the grinding aid aqueous solution.
Dry method mix grinding mainly contains two kinds, and a kind of is that gypsum is added lime by the requirement of processing compound is jointly levigate, but during gypsum lime mix grinding, should note the cooling of grinding machine or take other preventive measures, high and dehydration forms semi-hydrated gypsum with temperature in abrasionproof; Another kind is that part flyash and calcareous material are cooperatively levigate, can prevent lime from " sticking with paste mill " phenomenon occurring, improve mill efficiency, can obtain functional epoxy glue ramming material.
Dry mill process parameter:
Go out the fineness of grind materials.It is 5 ~ 15% that single material gypsum, lime dry grind that general 0.08mm tails over, and mix grinding technique specific surface 4000 ~ 6000cm2/g or 0.063mm square hole sieve more than 15 ~ 5%.
2) wet-grinding technology and relative device and processing parameter:
Wet-grinding technology and relative device efficiency is high, no dust pollution, is widely used in the levigate of siliceous material.
Wet-grinding technology and relative device major equipment is ball mill and mortar pump, slip basin.Ball mill is identical with dry method.Circulating tank after siliceous material is levigate at least should arrange two.The pulp quality of mix grinding is determined with fineness and concentration usually.Grinding machine work should grasp the granularity of material, color, foreign matter content and active situation at any time, adjusts in time according to need of production and determination data to feeding capacity and amount of water.
The wet-milling of single-material is applicable to sand, slag, flyash, and mixed wetmilling process mainly contains the Wet blend-milling of sand and lime, siliceous material adds calcareous material wet-milling, the Wet blend-milling of powder ash air-entrained concrete, hydro-thermal ball-milling technology.
Wet-milling processing parameter:
Pulp quality is to measure concentration and fineness is determined.Pulp quality requires according to decisions such as material kind and this kind of material quality level at that time and storage requirements, is 1.60 ~ 1.75kg/L to slurry density general requirement, the general 2800 ~ 3200cm2/g of fineness; Slag slurry general requirement is at 2500 ~ 2800cm2/g, and density is generally at 1.5 ~ 1.65kg/L; To flyash slip fineness general requirement 2800 ~ 3200cm2/g, the general 1.60 ~ 1.75kg/L of density.
(3) Pulp preparation
When sand or flyash are when adding water levigate, also complete pulping process simultaneously.Adopting when reaching the wet-discharged coal ash of fineness requirement also can the levigate and direct slurrying without flyash.The slurrying of dry powder coal ash, can by the feeding machine of bottom of the reservior after humidification stirrer be tentatively humidified, and feeding pulping agitator and water stir, and make the coal ash pulp meeting concentration requirement.Pulping process should adopt conputer controlled.The concentration of general production control slip is about 65%.
(4) preparation of liquid material and aluminium powder suspension
In order to make aluminium powder more easily be uniformly dispersed in whipping process, generally in advance aluminium powder cream is prepared into suspension.Aluminium powder suspension is formed by aluminium powder cream, grease-removing agent or suds-stabilizing agent 50 ~ 60 DEG C of hot water stirs.
Other solvable raw materials, as soda ash, borax, solvable wet goods, also answers the certain density hydrothermal solution of previously prepared one-tenth, stores metering separately.
2. prepare burden
The suitable centralized Control of burden process of Aerated Concrete, the operation of various equipment generally adopts electronic or pneumatic, and material metering measures with weight, is advisable to realize computer controlled automatic.
(1) design of proportioning
1) calcium silicon ratio:
The mole ratio of the total CaO in each composition material and the summation of total SiO2, is called that calcium silicon compares C/S.Usually, cement-lime-fly ash aeroconcretes C/S is about 0.8; The C/S value of cement-lime-sand Aerated Concrete is between 0.7-0.8.The C/S of cement-slag-sand Aerated Concrete is about 0.54.
2) ratio of water to material:
Ratio of water to material refers to the ratio of the total water content in slip and the summation of Aerated Concrete dry doses.The density of the Aerated Concrete of different varieties, material property and goods, under certain processing condition, has its best ratio of water to material.The best ratio of water to material of density 500kg/m3 cement-lime-sand Aerated Concrete is at 0.65-0.75; The best ratio of water to material of Aerated Concrete of 500kg/m3 cement-lime-flyash is at 0.60-0.75; The best ratio of water to material 0.55 ~ 0.65 of 500kg/m3 cement-slag-sand Aerated Concrete.
Meeting under process control condition, preferably adopt less ratio of water to material.
3) volume density:
The design volume density of Aerated Concrete be designed Aerated Concrete goods after completing steam press maintenance, the theoretical dry weight of unit volume.
(2) the reference proportioning of different varieties Aerated Concrete
1) cement-lime-sand mold gas concrete
According to research and a large amount of production experience, the optimum mix of cement-lime-sand mold gas concrete is as follows:
1. calcareous material total amount 38% ~ 40% (wherein, cement/lime: 0.15 ~ 0.30).
2. dry substance consumption cement 5% ~ 10%, lime 35% ~ 30%, gypsum≤3%, sand 57% ~ 60%
3. aluminium powder consumption dry substance 0.07% ~ 0.08%.
4. ratio of water to material 0.63 ~ 0.70.
5. teeming temperature 35 ~ 38 DEG C.
6. aluminium powder churning time 30 ~ 60s.
Cement should adopt silicate cement, also can use slag cement.Now, cement is preferably 1:5 with the ratio of lime.Gypsum is very responsive for delaying clearing up of lime, but consumption can not be excessive, is advisable with 2%.
2) cement-slag-sand mold gas concrete
Optimum mix is as follows:
1. cement 18% ~ 20% (ordinary Portland cement).
2. slag 30% ~ 32% (blast furnace slag).
3. sand 48% ~ 52%.
4. aluminium powder 0.07% ~ 0.08%.
5. soda ash 4kg/m3.
6. borax 0.4kg/m3.
7. soluble oil 0.6L/m3.
8. ratio of water to material 0.6 ~ 0.7
9. teeming temperature 40 ~ 45 DEG C
10. aluminium powder churning time 15 ~ 25s
Because the slag of different ironworks output is at composition with difference is very large in nature, concrete proportioning parameter, needs great many of experiments to determine.The suitable maintenance pressure of this kind of gas concrete is about 1.5Mpa.
3) cement-lime-flyash type gas concrete
Optimum mix is as follows:
1. cement 10% ~ 20%.
2. lime 20% ~ 24% (effective calcium ACaO=14% ~ 17%).
3. gypsum 5% ~ 3%.
4. flyash 63% ~ 65%.
5. aluminium powder 0.07% ~ 0.08%.
6. ratio of water to material 0.6 ~ 0.64.
7. teeming temperature 36 ~ 40 DEG C
8. aluminium powder churning time 30 ~ 40s
In formula, total consumption of cement+lime, should not adopt the value that immobilizes.When lime consumption is 20%, the optimum amount of cement is 10%.The optimum mix amount of gypsum be lime, the total consumption of cement 5%, flyash should not grind meticulous.
(3) production mix proportion calculates
In field experience proportioning and verification experimental verification basis, after determining optimum mix, calculate production mix proportion, the i.e. raw material usage of unit article.
(4) proportioning process equipment
Production batching is carried out by the proportioning determined.Starting material physical aspect for batching has three kinds, i.e. liquid material, pasty material, pulverulent material, and also have aluminium powder or aluminium powder cream in addition, feeding and the metering outfit of different material are as follows:
1) batching of pasty material
In production, siliceous material is generally first prepared into the forms such as mortar, slag slurry, coal ash pulp by wet milling process.Pasty material metering also more adopts slip test tank, and both can pass through sight glass liquid level, and adopt volume metering, gage probe also can be adopted to measure in right amount, for ease of computer control, amount is for good by weight.
2) batching of pulverulent material
General employing automatic weight weigher metering, is divided into lever and electronic sensing type two class.Electronic sensing type weigher Measuring Precision is high, can realize record and Whole Process automatically and control.
3) batching of liquid material
Conventional volumeter measuring tank metering, its volume can design on demand, existing multiplex weight metering.
4) batching of aluminium powder or aluminium powder cream
The metering aluminium powder of aluminium powder claims, and mostly be manual operation, sanitary condition is poor.Aluminium powder cream weighing balance also can control automatically.
(5) ratio range and example
Fly ash aeroconcretes
Sand Aerated Concrete ratio range and example
3. stir casting
Stirring cast is by even for the material stirring meeting proportioning requirement, makes gas concrete slip, injects mould, make it form Aerated concrete blank.
(1) pouring forming technology main Types is stirred
Stirring casting is divided into stirring cast to get angry and two stages of setting and harden.The previous stage is added in special stirrer by the program of process stipulation by the material measured at burden process to be prepared into slip, and inject mould and make its expansion of getting angry, and the latter half leaves standstill sclerosis under the envrionment conditions of processing requirement, forms base substrate.
Pouring technology is divided into mobile cast and fixed point cast two type.
The quiet process of stopping is base substrate process of setting.It is quiet that to stop hardening process mode conventional be at present quietly on the spot stop and move quietly to stop two kinds.
(2) major equipment of cast is stirred
Stirrer: stir gas concrete slip and generally adopt special gas concrete slip stirrer.Each amount of agitation should meet the slip consumption of a mould.
Gate spool: gate spool is that gas concrete slip flows into the transfer passage of mould from stirrer, is also the distributor enabling slip be full of each corner of mould quickly.Junction between gate spool and stirrer is provided with the valve controlling slip flow, is generally manually or the dynamic butterfly valve of gas (electricity).
The feeding device of stirrer: need be supporting with stirrer performance.To pasty material, general butterfly valve can accurate fast blanking; Pulverulent material, general requirement material feeder feed evenly, continuously, speed is adjustable, good seal in addition, as form material feeder, worm conveyor etc.
(3) base substrate just supports technique
Gas concrete slip is got angry and is expanded and leave standstill sclerosis in mould, is commonly referred to base substrate and just supports, and its facility comprises and quietly stops mould table, just supports room, just supports tunnel and just support roller-way.
(4) casting process parameters is stirred:
1) slip optimal temperature is poured into a mould: fly ash aeroconcretes: 36 ~ 40 DEG C
Sand Aerated Concrete: 35-38 DEG C
Cement-slag-sand: 40 ~ 45 DEG C
The denseness of slip: diffusibleness 18-20cm.
Get angry the time: 15-20 minute
2) feeding sequence of gas concrete slip is stirred
The feeding sequence of stirrer is generally followed and is first thrown pasty material and water, then throws pulverulent material, finally throws the principle of subsidiary material and material of getting angry.The churning time of slip and powder is 1 ~ 2min; The churning time of cement and mixed slurry is 2 ~ 4min; Alkali lye stirs 0.33 ~ 1min; Aluminium powder stirs 0.25 ~ 1min.Wherein, cement is reinforced unsuitable too fast, about needs lasting 1min.
3) quietly to stop
Length between the quiet stopping time is relevant with the quiet envrionment temperature height stopped, and envrionment temperature is high, short between the quiet stopping time.Generally quiet envrionment temperature of stopping is not less than 20 DEG C, is advisable with 40-50.
The hardening index that base substrate is just supported, can cut plastic strength to weigh, is generally advisable with 0.045-0.08Mpa.When temperature is 50 DEG C, be 1.5 ~ 2.5h between the quiet stopping time of Aerated concrete blank.
After being poured, relevant technological parameters to be filled in time.
Stirring technique parameter and example
Quiet shut-down skill examples of parameters
4. cut
(1) cutting technique mode
Cutting is exactly by through precuring, the base substrate reaching some strength, cuts into the goods of certain specification and size.General employing steel wire is as parting tool.
(2) facility of cutting technique
The cutting facility that gas concrete enterprise uses mainly cuts unit.Cutting machine need meet JC/T921 " steam-pressing aero-concrete cutting machine " requirement.
5. steam press maintenance
(1) steaming pressuring curing system
Steaming pressuring curing system refers to a kind of optimum relations of vapor temperature in still (pressure) and time.According to this relation, generally steam press maintenance process be divided into vacuumize, heat up, constant temperature, cooling four-stage.
Best maintenance pressure is 1.0 ~ 1.2MPa, and still pressure should be guaranteed supply slightly larger than 1.0 ~ 1.2MPa saturation steam in boiler house.Suitable vacuum tightness is-0.06 ~-0.07MPa, and vacuum pumping rate makes gauge pressure in still reach-0.06MPa with 30 ~ 50min.Heating-up time general 120-180min.Comprehensive various factors is considered, best constant temperature and pressure is 1.0 ~ 1.2Mpa, and constant temperature time is 6 ~ 7h.General temperature fall time is about 2h.
The aerating coagulation steaming pressuring curing system of three kinds of type of raw materials
(2) steam press maintenance equipment
The major equipment of steam press maintenance is autoclave.
The operation of steam pressure process mainly comprises base substrate and enters still, vacuumizes, send vapour, goes out still four procedure.Before base substrate enters still, first to check that whether the work such as safety valve, tensimeter, trap are normal; Must ensure when base substrate enters still mould car steadily, close kettle cover before first with brush, the saponified oil being mixed with graphite is embrocated in rubber seal, still door must check the whether normal locking of locking latches after closing, then logical steam tensioner sealing-ring sealing.Vacuumize and send vapour, strictly must be operated by working specification by special messenger.
Enterprise should adopt above autoclave.
(3) UTILIZATION OF VESIDUAL HEAT IN
Enterprise product energy consumption index should meet relevant regulatory requirements.In order to make full use of waste heat, aero-crete factory generally adopts " tune vapour " scheme of many stills circular flow, is transformed into the lower still of pressure by steam from the still that pressure is high, utilizes remaining vapour to produce and heats up." tune vapour " can adopt single still once to adjust vapour, two still echelon conversions, squirt pump unsteady state operation three kinds of modes.
Cement---lime---fly ash aeroconcretes steaming pressuring curing system and example
Cement---lime---sand Aerated Concrete steaming pressuring curing system and example
6. form removal
Aerated concrete products, after autoclave pull-out, is parked 1 ~ 2h and is started form removal.To sectional die and curing in the mold time, must in special form removal station form removal.For the large mould of volume at more than 4m3, all use special form removal facility.For the small mould of volume at below 4m3, availablely manually pull form removal.Quality inspection personnel grades to goods and draws class, by national Specification, stamps various mark and date manufactured.To the stool of mould, after form removal, clear up on the spot, and check its planeness, then oiling is stand-by.Cleaning oiling is carried out to the mould reconfigured.
7. goods processing and repairing
(1) goods processing
Process by craft or machinery, manipulative device has channeling device, plane hornwork, cork drill, handsaw etc.Machining equipment is sheet material milling and grinding machine and building block processing machine mainly.
(2) goods are repaired
Some macroscopic irregularity of gas concrete, as long as no reaching the degree affecting structure properties and result of use, comprising losing fangle, surface damage etc. that the size that only affects outward appearance is little, generally can recover by repairing.Patching material is filled a prescription: cement 20%; The plaster of Paris 20%; Gas concrete powder (getting from milling and grinding machine dust-precipitator) 60%, repairing should be carried out in indoor, and winter is antifreeze.
7. the packaging of building block
Wrapping machine or the packing of hand press-packing facility should be adopted.
More than show and describe ultimate principle of the present invention, principal character and advantage of the present invention.The technician of the industry should understand; the present invention is not restricted to the described embodiments; what describe in above-described embodiment and specification sheets just illustrates principle of the present invention; without departing from the spirit and scope of the present invention; the present invention also has various changes and modifications, and these changes and improvements all fall in the claimed scope of the invention.Application claims protection domain is defined by appending claims and equivalent thereof.

Claims (1)

1. autoclaved aerated concrete blocks manufacturing process, is characterized in that: technical process can be divided into: raw material disposal and Pulp preparation, batching, stirring casting, quietly to stop and cutting, steam press maintenance, form removal, processing and packaging process, is specially:
1) raw-material process and Pulp preparation
Raw material disposal and Pulp preparation comprise lumpy material fragmentation, levigate and pulping process link:
1. the fragmentation of lumpy material:
The fragmentation of lumpy material mainly refers to the fragmentation of unslaked lime and the plaster of paris, uses jaw crusher and hammer mill, Particle size requirements < 15mm after broken.
2. lumpy material is levigate:
Saccharoid levigate, is generally divided into single-material dry grinding, single-material wet-milling, the dry grinding of two or more material mixing and Wet blend-milling, single siliceous material to add calcic useless slurry wet-milling five kinds of grinding processes.
Dry mill process and processing parameter
Dry method mix grinding mainly contains two kinds, and a kind of is that gypsum is added lime by the requirement of processing compound is jointly levigate, but during gypsum lime mix grinding, should note the cooling of grinding machine or take other preventive measures, high and dehydration forms semi-hydrated gypsum with temperature in abrasionproof; Another kind is that part flyash and calcareous material are cooperatively levigate, can prevent lime from " sticking with paste mill " phenomenon occurring, improve mill efficiency, can obtain functional epoxy glue ramming material.
Dry mill process parameter:
Go out the fineness of grind materials.It is 5 ~ 15% that single material gypsum, lime dry grind that general 0.08mm tails over, and mix grinding technique specific surface 4000 ~ 6000cm2/g or 0.063mm square hole sieve more than 15 ~ 5%.
Wet-grinding technology and relative device and processing parameter:
Wet-grinding technology and relative device major equipment is ball mill and mortar pump, slip basin.Ball mill is identical with dry method.Circulating tank after siliceous material is levigate at least should arrange two.The pulp quality of mix grinding is determined with fineness and concentration usually.Grinding machine work should grasp the granularity of material, color, foreign matter content and active situation at any time, adjusts in time according to need of production and determination data to feeding capacity and amount of water.
The wet-milling of single-material is applicable to sand, slag, flyash, and mixed wetmilling process mainly contains the Wet blend-milling of sand and lime, siliceous material adds calcareous material wet-milling, the Wet blend-milling of powder ash air-entrained concrete, hydro-thermal ball-milling technology.
Wet-milling processing parameter:
Slurry density is required to be 1.60 ~ 1.75kg/L, fineness 2800 ~ 3200cm2/g; Slag slurry requires at 2500 ~ 2800cm2/g, and density is at 1.5 ~ 1.65kg/L; To flyash slip fineness requirement 2800 ~ 3200cm2/g, density 1.60 ~ 1.75kg/L.
3. Pulp preparation
When sand or flyash are when adding water levigate, also complete pulping process simultaneously.Adopting when reaching the wet-discharged coal ash of fineness requirement also can the levigate and direct slurrying without flyash.The slurrying of dry powder coal ash, can by the feeding machine of bottom of the reservior after humidification stirrer be tentatively humidified, and feeding pulping agitator and water stir, and make the coal ash pulp meeting concentration requirement.The concentration of general production control slip is about 65%.
The preparation of liquid material and aluminium powder suspension
In order to make aluminium powder more easily be uniformly dispersed in whipping process, generally in advance aluminium powder cream is prepared into suspension.Aluminium powder suspension is formed by aluminium powder cream, grease-removing agent or suds-stabilizing agent 50 ~ 60 DEG C of hot water stirs.
2) prepare burden:
Cement 6-15%, lime 18-25%, flyash 65-70%, gypsum 3-5%, aluminium powder cream 0.07-0.08%, ratio of water to material 0.60-0.65, teeming temperature 36-40 DEG C, aluminium powder churning time 30-40s.
3) casting is stirred:
Stir pouring forming technology main Types
Stirring casting is divided into stirring cast to get angry and two stages of setting and harden.The previous stage is added in special stirrer by the program of process stipulation by the material measured at burden process to be prepared into slip, and inject mould and make its expansion of getting angry, and the latter half leaves standstill sclerosis under the envrionment conditions of processing requirement, forms base substrate.
Base substrate just supports technique:
Gas concrete slip is got angry and is expanded and leave standstill sclerosis in mould, is commonly referred to base substrate and just supports, and its facility comprises and quietly stops mould table, just supports room, just supports tunnel and just support roller-way.
Stir casting process parameters:
Cast slip optimal temperature: fly ash aeroconcretes: 36 ~ 40 DEG C
Sand Aerated Concrete: 35-38 DEG C
Cement-slag-sand: 40 ~ 45 DEG C
The denseness of slip: diffusibleness 18-20cm.
Get angry the time: 15-20 minute,
Stir the feeding sequence of gas concrete slip:
The feeding sequence of stirrer is generally followed and is first thrown pasty material and water, then throws pulverulent material, finally throws the principle of subsidiary material and material of getting angry.The churning time of slip and powder is 1 ~ 2min; The churning time of cement and mixed slurry is 2 ~ 4min; Alkali lye stirs 0.33 ~ 1min; Aluminium powder stirs 0.25 ~ 1min.Wherein, cement is reinforced unsuitable too fast, about needs lasting 1min.
4) quietly to stop:
Length between the quiet stopping time is relevant with the quiet envrionment temperature height stopped, and envrionment temperature is high, short between the quiet stopping time.Generally quiet envrionment temperature of stopping is not less than 20 DEG C, is advisable with 40-50.
The hardening index that base substrate is just supported, can cut plastic strength to weigh, is advisable with 0.045-0.08Mpa.When temperature is 50 DEG C, be 1.5 ~ 2.5h between the quiet stopping time of Aerated concrete blank.
5) cut.
6) steam press maintenance:
Maintenance pressure is 1.0 ~ 1.2MPa, and still pressure should be guaranteed supply slightly larger than 1.0 ~ 1.2MPa saturation steam in boiler house.Suitable vacuum tightness is-0.06 ~-0.07MPa, and vacuum pumping rate makes gauge pressure in still reach-0.06MPa with 30 ~ 50min.Heating-up time general 120-180min.。
7) form removal.
8) goods processing and repairing:
Process by craft or machinery, manipulative device has channeling device, plane hornwork, cork drill, handsaw.Machining equipment is sheet material milling and grinding machine and building block processing machine mainly.
Goods are repaired:
Some macroscopic irregularity of gas concrete, as long as no reaching the degree affecting structure properties and result of use, comprising losing fangle, surface damage etc. that the size that only affects outward appearance is little, generally can recover by repairing.Patching material is filled a prescription: cement 20%; The plaster of Paris 20%; Gas concrete powder (getting from milling and grinding machine dust-precipitator) 60%, repairing should be carried out in indoor, and winter is antifreeze.
9) packaging of building block.
CN201410418306.9A 2014-08-22 2014-08-22 Process for manufacturing autoclaved aerated concrete block Pending CN104230372A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106116359A (en) * 2016-06-28 2016-11-16 北京建筑材料科学研究总院有限公司 A kind of special rapid-patching motar of steam-aerated concrete plate and preparation method and application
CN108558339A (en) * 2018-04-26 2018-09-21 贵州开磷磷石膏综合利用有限公司 A kind of preparation method of autoclaved aerated concrete slab
CN112171870A (en) * 2020-09-28 2021-01-05 吴秋敏 Forming method of fireproof aerated concrete block

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CN101172819A (en) * 2007-10-29 2008-05-07 苏州金通新型建材有限公司 Autoclaved aerated concrete building block and manufacturing method thereof

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CN101172819A (en) * 2007-10-29 2008-05-07 苏州金通新型建材有限公司 Autoclaved aerated concrete building block and manufacturing method thereof

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106116359A (en) * 2016-06-28 2016-11-16 北京建筑材料科学研究总院有限公司 A kind of special rapid-patching motar of steam-aerated concrete plate and preparation method and application
CN108558339A (en) * 2018-04-26 2018-09-21 贵州开磷磷石膏综合利用有限公司 A kind of preparation method of autoclaved aerated concrete slab
CN112171870A (en) * 2020-09-28 2021-01-05 吴秋敏 Forming method of fireproof aerated concrete block

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