Quicklime

for AAC, sand lime brick and other application for high-quality lime

In several countries high-quality lime is not available. Producers of AAC, sand lime brick, and other lime products are in urgent need for high-quality lime.

The ideal lime for AAC production is “hard burnt” or “middle burnt”. This lime has a low reactivity (slaking time of 4 - 7 (12) minutes to reach a temperature of 60 °C). The low reactivity facilitates consistent and slow rising of the AAC mix in the mould.

The ideal lime for sandlime brick and hydrated lime production is “soft burnt” or “middle burnt”. This lime has a higher reactivity (slaking time of 1- 4  minutes to reach a temperature of 60 °C). The higher reactivity facilitates quick slaking and reduces volume and through-put time in the reactor (sand lime) or slaking machine (hydrated lime).

What is important during burning?
Consistent burning of all lime stones in the shaft kiln, i.e. consistent distribution of heat inside the whole cross section of the kiln.
•    Complete calcination of all lime stones.
•    Combustion of sulphur particles (only possible athigh temperatures).

Important features of the shaft kiln
•    lowest possible kiln volume
•    low investment for steel structures
•    low investment for refractory
•    low height
•    low area for installation
•    adjustable burning temperature allows customized burning to requirement
•    use of heated cooling air during burning
     (the  ready burnt quicklime is cooled by air)
     = most effective energy use
     = lowest possible energy consumption (approx. 30 – 50 % less than rotary kiln)

Kiln sizes
The following sizes are available:
•    50 t/day quicklime
•    100 t/day quicklime
•    150 t/day quicklime
•    200 t/day quicklime
•    300 t/day quicklime

Note:

All shaft kilns can be operated at a minimum of 50 % of above mentioned capacity!
This is important when the consumption is calculated. During winter some countries need less quicklime.