The production line of autoclaved grey sand brick equipment is a technologically mature and high-performance production line, and its production process includes steps such as processing and handling of raw materials, batching and mixing, digestion, wheel rolling, pressing and forming, static stop of the billet, autoclaved curing, and finished product inspection and stacking. The autoclaved sand lime bricks produced through this production line have various excellent properties and are widely used in the construction field.
The autoclaved sand-lime brick production line is an automated production line that utilizes sand and lime as its primary raw materials to manufacture sand-lime bricks through a series of technological processes. Below is a detailed introduction to this production line:
I. Primary Raw Materials
Sand: It can be sourced from mountain sand, river sand, aeolian sand, or artificial sand produced by crushing rocks, as well as waste sand from industrial casting. The quality of sand must meet certain technical requirements, such as a silica (SiO2) content greater than 65% and a clay content less than 15%.
Quicklime: High-calcium, fast-digesting, and high-digestion-temperature quicklime should be selected, with a CaO content exceeding 60% and an MgO content below 5%.
Other Materials: Depending on requirements, pigments, admixtures, and production water can be added.
II. Main Equipment
The autoclaved sand-lime brick production line primarily comprises the following main and auxiliary equipment:
Crusher: Used to crush blocky raw materials like quicklime.
Ball Mill: Grinds the crushed raw materials to the required fineness for production.
Mixer: Mixes the measured quicklime, sand, and water according to the mix ratio, typically involving primary and secondary mixing processes.
Digestion Silo: Allows the mixed material from the primary mixing to digest (i.e., convert quicklime to hydrated lime), usually controlled for 2-3 hours.
Pan Mill: Enhances the plasticity of the digested mixture through pan milling, improving product quality.
Sand-Lime Brick Press: Compresses the pan-milled material into bricks, often adopting double-sided, multi-pressure molding.
Autoclave: Cures the formed bricks under high temperature and pressure to enhance their strength and performance.
Boiler: Provides steam for the autoclave, essential for the curing system.
Additionally, auxiliary equipment includes storage bins, bucket elevators, metering feeders, screw conveyors, belt conveyors, curing carts, and shuttle cars.
III. Production Process
The production process of autoclaved sand-lime bricks primarily involves the following steps:
Raw Material Processing: Crush and grind raw materials to meet production requirements.
Batching and Mixing: Mix raw materials in proportion and add water to achieve a uniform blend.
Digestion: Send the mixed material to the digestion silo for hydration, ensuring complete digestion of quicklime and improving the plasticity of the mixture.
Pan Milling: Enhance the plasticity of the digested mixture through pan milling.
Pressing and Molding: Compress the pan-milled material into bricks using a press, often with double-sided, multi-pressure molding.
Stacking and Static Resting: Place the formed bricks on curing carts and send them to the static resting line for grouping and resting.
Autoclave Curing: Cure the bricks under high temperature and pressure to improve their strength and performance.
Finished Product Inspection and Stacking: Inspect the cured bricks, stack them neatly in the yard, and allow them to stabilize before shipment.
IV. Product Performance
Autoclaved sand-lime bricks exhibit various excellent properties, including high thermal storage capacity, superior sound insulation, and non-flammability. Their standard dimensions (240mm×115mm×53mm) are identical to those of ordinary solid clay bricks, allowing direct substitution. Furthermore, they possess good frost resistance, carbonation resistance, acid and alkali resistance, and fire resistance.
V. Conclusion
The autoclaved sand-lime brick production line is a technologically mature and high-performance production line. Its production process encompasses raw material processing, batching and mixing, digestion, pan milling, pressing and molding, stacking and static resting, autoclave curing, and finished product inspection and stacking. The bricks produced through this line possess numerous superior properties, making them widely applicable in the construction industry.
