Porous AAC Block Machinery Fully Automatic Fly Ash Block Making
Our equipments produce AAC sand lime brick.Aerated concrete block
material with cement,lime, gypsum and quartz sand,aluminum foam, It
is a fine porous block after the steam pressure curing , the
specifications for 600mm x (200, 250, 300(100) mm * 150, mm, 200).
According to the different density mainly, aerated concrete block
specifications are B05, B06 two levels, the average compressive
strength is not less than 2.5 MPa and 3.5 Mpa, respectively. The
thermal conductivity is less than 0.13 W / mK and 0.16 W / mK.The
main materials as below are sand, cement, lime and aluminum powder.
425 # cement shall be acceptable.
The sand shall be requested as standard JC/T 622<sand for
silicate building products>, The more quartz content, the better
result of production.
Table3-1 Chemical content of sand
Table3-2 Granulation of sand
The lime shall be requested as JC/T 621-2009<lime for silicate
4. Aluminum powder
The aluminum powder shall be requested as JC/T 407-2008<aluminum
powder for AAC
General Processing Description
1. After crushing, the lime & gypsum grains are stored in
vertical silo, the granularity should be no more than 25mm. Then
the grains are fed into ball mill by separate belt scale, and will
be sent to granular cementation silo when granularity reaches
2. Mill the sand to slurry in wet ball mill and put the slurry into
tank for storage.
3. Add the sand slurry, granular cementation materials & cement
which are scaled as per proportion into the casting tank equipped
with stirrer for mixing, a certain amount of steam should be
entered into the stirrer for increasing the raw materials
temperature to 40~45℃.
4. After mixing of 3~4min, open the discharger valve of aluminum
powder, feeding into the tank, and continue mixing about 40
seconds, then pour the mixed slurry into mould for casting. The
whole cycle is 6~8min.
5. Transport the casting cake with mould to curing zone for foaming
and concreting, environment temperature is 40~45℃ and curing time
is 90~150min; and then pull out them from the curing zone when the
strength reach the lowest cutting strength.
6. Transport the mould with casting cake to cutting zone. A titling
machine separates the cake from the mould and put the cake onto
loading car after 90 degree overturning. After vertical cutting
& cross cutting the cake turns into blocks (L ± 3mm ~ W ± 1.5mm
~ H ± 0.6mm), then the ground turning device turns 90 degree and
place the blocks onto autoclave base plate.
7. The loading car transports the cakes into autoclave with
temperature 190℃ and steam pressure 1.2MPa, autoclaving cycle is
12H. The tail steam of the autoclave will be recycled into other
autoclaves and/or to curing zone by pipe for completely
8. After autoclaving, the blocks are put in different stacks, and
the separate moulds are transported to mold cleaning zone for
cleaning and continuously production.
9. The waste materials will be collected into a waste slurry tank,
where mixed with fresh materials in a correct proportion for
5. Technological data
Mixing cycle: 6 ~ 7 minutes
Casting temperature: 40 ~ 45℃
Curing time: 2.5 ~ 3.0h
Environment temperature for curing: 45 ~ 55℃
Autoclave loading /unloading: 0.5h
Vacuuming: 0.5h (0 ~ -0.05MPa)
Pressure up: 1.5h (0.06 ~ 1.2 MPa)
Constant pressure: 7h (1.2 MPa)
Pressure down: 1.5 h (1.2 ~ 0MPa)