50000 cbm per year Silica sand / fly ash Autoclaved aerated concrete AAC block production line
Basic Introduction of AAC Block:
Autoclaved Aerated Concrete (AAC) is a siliceous material (sand, fly ash and silicon tailings such as waste porcelain clay, stone processing waste materials, blast furnace slag, etc.) and calcareous materials (lime, cement) as the main raw material, mixing fat gas agent (aluminum powder), by ingredients, mixing, casting, preraising, cutting, autoclave, curing process made of light porous silicate products, because by the hair contains a lot of gas even after the small pores, hence the name of aerated concrete.
Advantages of AAC Block:
1, Lightweight:The aerated concrete dry bulk density generally is 400-800kg/m3, equivalently to clay brick 1/3, normal concrete 1/5, lower than normal light-weight aggregate concrete and hollow
brick, hollow clay brick. so, using aerated concrete as wall material can lighten the building self weight, and then reduce the size of building foundation, girder and pillar etc. Structure, save building material and project cost, improve the building shock resistance.
Several common building material volume density (kg/m3)
||lime and sand brick
2, Fireproof: Most of the major raw materials is inorganic materials, so it has good fire resistance, and do not emit harmful gases when meet fire. Fire 650 degrees, as a refractory material, the thick up of 90mm walls can reach to 245 minutes fire resistance, 300mm thick up wall can reach to 520 minutes fire resistance.
3,Sound insulation: Due to a unique porous structure, so it has a sound absorption capacity. The sound absorption capacity can reach of 10mm thick wall up to 41 db.
4, Insulation: As the material inside has a large numbers of the pores and porous, which has a good thermal insulation properties. The Thermal conductivity is 0.11-0.16W/MK, as 1/4-1/5 of brick. Typically, the insulation effect of 20cm thick aerated concrete wall is equivalent to 49cm thick solid brick walls ordinary.
5, Permeability: Result of material by the composition of many independent small pores, the moisture absorption is slow, in the volume of absorbent is 5 times of clay saturation do. When used in the bathroom, the wall can be treated to interface directly paste tiles.
6, Anti-seismic:The same building structure, improve the two seismic than the brick level.
7, Green: Manufacturing, transportation, all use the process of pollution, to protect arable land, saving energy, is one kind of a green building material.
8, Durability: material strength is stability, in the specimens tested after one year of atmospheric exposure; the intensity increased by 25%, and remained stable after ten years.
9, Shortcut: it has good machinability, can be sawed, planed, drilled, nailed, and available appropriate as bonding of adhesive material, so create favorable conditions for building construction.
10, Economies: An integrated lower cost than using more than 5% of solid clay bricks, and can increase the usable area, greatly enhance the utilization of floor space.
Main raw material of AAC block:
1, Sand(fly ash): meet standard JC/T622-1996, technical requirements: SiO2s >65%, 0.08mm residue on sieve <20%, CaCO3<10%, So3<2%, clay<8%, no impurity.
2, Lump quick lime: meet standard JC/T621-1996, technical requirements: A-CaO>65%, slacking time 8-15min, slacking temperature >65°C, burnt lime content <8%, ash content <10%, MgO <5%.
3, Gypsum: technical requirement: Dihydrate gypsum or phosphogypsum, SO2 content >35%.
4, Aluminium powder or aluminum paste: solids content >65%,
5, Cement: meet standard GB175-92, 32.5R bulk cement.
1, Material-milling Equipments:
a. Crusher: Lime, gypsum, and such kind of bulk material need to be crushed as the first step in AAC Plant.
b. Ball mill: The AAC material must be fully grinded in order to make better reaction. Ball Mill is used widely, it has two types: dry and wet, can be chosen upon requirement.
2, Material Metering Equipments: Computer Control Automatic Metering System is commonly used as measurement of raw materials.
3, Material mixing and casting equipments: Mixer, it’s the slurry mixing machine, also is slurry casting machine.
4, Cutting Machine: the AAC blank is formed after casting and precuring, as the size is too large, it must be cut to achieve the required product size.
5, Autoclave: Autoclave is a device for silicate hydration products to get physical and mechanical properties.
6, Boiler: the boiler supports for the autoclave and preheat furnace and other facilities with heat.