Who is Lytag Ltd?
Lytag Ltd was formed in the 60’s following a joint research project between John Laing Ltd and the BRE to develop a lightweight aggregate from pfa. The resulting successfully developed process was patented and the Lytag® LWA product registered.
At its height Lytag® LWA was produced from 4 production units in the UK, 1 in Holland, 1 in Poland and 1 in China. Due to the UK company being a subsidiary of a number of larger multi national companies over the years, the continued investment required to ensure product progress was not forthcoming and the last of the UK units finally closed in 2005. UK supplies continued with imports from our partner company in Poland.
In 2008 Lytag Ltd finally became independent and is now looking to the future with the intention of constructing new production facilities for the manufacture of Lytag® LWA. By utilising new technologies and further developing the original process, Lytag Ltd will continue to be a world leader in the production of lightweight aggregates.
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What is Lytag®?
The raw material used in the manufacture of Lytag® LWA is fly ash. This is the waste material produced from electricity production in coal-fired power stations. This aggregate is called ‘sintered pulverised fuel ash lightweight aggregate’, more commonly known as Lytag® LWA.
How is Lytag® made?
Lytag® LWA is made by pelletising the fly ash. By adding a controlled amount of water in specially designed dish pelletising pans, rounded pellets are formed. The pellets are then heated on a sinter strand to a temperature of around 1100°C.
The result is a hard, honeycombed structure of interconnecting voids within the aggregate. The particles formed are rounded in shape and range in size from 14mm down to fines; these are processed to the required grading, depending on the final use.
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