What is Lytag?
The raw material used in the manufacture of lightweight aggregate 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. |
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How is Lytag made?
Lytag 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 between 1000°C and 1250°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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