Lytag Produced by Rotary Kiln

The lytag produced by rotary kiln is mainly in Russia, the United States, Britain, Germany, Poland, Japan and so on. Among which the Russian exists most, the annual production capacity is about 2000000 m3. the scale of production lines: the majority of 100000m3/y. The performance of main products: ultra light weight aggregate (250kg/ m3-500kg/ m3, bulk density, cylinder pressure 0.9MP-2.0MP, water absorption rate 11%-15%, diameter 5mm-40mm) and high-strength haydite (bulk density 800kg/m3-1000kg/m3, cylinder pressure 6MP-8MP, water absorption the rate of <10%, particle size 5mm-20mm). The amount of fly ash is at least 10%-15%, up to 60%-80%, most of which is 30%-40%.
In our country, the production of lytag from the rotary kiln is started by Fushun building materials company in 1965. The average bulk density of the ceramic is 484kg/m3, and the annual yield is about 7000 m3. An annual output of 15000 m3 lytag production line in 1974: fly ash content is 70%-75%, clay 25%-30%, the bulk density of ceramic 600kg/m3-900kg/m3, cylinder pressure strength 3.8MPa-9.8, water absorption 9%-10%, particle diameter 5-20mm.
The production practice shows that the production of lytag in rotary kiln method of ultra light weight aggregate, there are certain requirements for fly ash: SiO2 45%-60%, Al2O3<24% Fe2O3, 4%-8%, CaO+MgO=3%-5%, the fineness of fly ash 88μm sieve residue should be less than 30%, loss is 4%-13%. If the Al2O3 is more than 24%, the output of the fly ash is relatively reduced, it is difficult to exceed 50%; If the content of Fe2O3, CaO+MgO, loss is insufficient, the corresponding additive should be added.
The requirements of fly ash is relatively low for producing ordinary or high strength lytag by rotary kiln, It has no special requirements of Fe2O3, Al2O3 and other content, as long as effective measures to be taken, ordinary or high strength lytag can be produced.
For decades production practice at home and abroad show that the use of fly ash production of artificial lightweight aggregate, ceramsite, with ash, energy-saving effect is good, excellent product quality, wide application range, good economic benefits, social benefits as long as one of the advantages of the project, in accordance with the local and surrounding market demand, we should make fast, effective and sustainable development lytag.