Sand processing and storage
Aerated concrete is made from the raw materials silica sand, lime, cement, gypsum (anhydrite), aluminium powder/paste, and water.
The precisely measured raw sand and the required quantity of water are fed into the wet ball mill where the raw sand is processed into sand slurry. The consistency of the sand slurry is defined exactly in terms of sand slurry density and grinding fineness. The throughput of the mill is adapted to the production capacity of the AAC factory in respect of the required maximum density of the aerated concrete. The milling process itself is carried out by means of grinding bodies (Cylpebs or steel balls).
After the grinding process, the sand slurry is pumped into sand slurry tanks for storage. Integrated stirrers serve to maintain the optimum consistency.