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Why Do The Rotary Kilns Have The Same Size

The common feature of early kilns was an egg-cup shaped burning chamber, with an air inlet at the base (the "eye"), constructed of brick.Limestone was crushed (often by hand) to fairly uniform 20-60 mm (1 to 2.5 inch) lumps - fine stone was rejected.Successive dome-shaped layers of coal and limestone were built up in the kiln on grate bars across the eye.When loading was complete, the kiln was kindled at the bottom, and the fire gradually spread upwards through the charge.When burnt through, the lime was cooled and raked out through the base.Fine coal ash dropped out and was rejected with the "riddlings".Cement kiln is used for making of cement clinker and there are dry and wet methods to make cement.Metallurgy chemical kiln is used in metallurgy industry and ironworks for lean iron ore, chromium ore and ferronickel ore calcimine.Rotary kiln is used for calcimine of high aluminum vandal ochre in refractory material industry; for calcimine of calotte and aluminum hydroxide in aluminum manufacturer; for claiming of chrome sand ore and chrome powder ore in chemical plant.Lime kiln is used for baking active lime and dolomite in the steel factory and ferroalloy factory.Cross section of typical early kilnonly lump stone could be used, because the charge needed to "breathe" during firing.This also limited the size of kilns and explains why kilns were all much the same size.Above a certain diameter, the half-burned charge would be likely to collapse under its own weight, extinguishing the fire.So kilns always made 25-30 tonnes of lime in a batch.Typically the kiln took a day to load, three days to fire, two days to cool and a day to unload, so a one-week turnaround was normal.The degree of burning was controlled by trial and error from batch to batch by varying the amount of fuel used.Because there were large temperature differences between the center of the charge and the material close to the wall, a mixture of under-burned (i.E.High loss on ignition), well-burned and dead-burned lime was normally produced.Typical fuel efficiency was low, with 0.5 tonnes or more of coal being used per tonne of finished lime (15 mj/kg).Sand washer supplier : http://www.Hxjqcrusher.Com/crusher/sand-washer.Htmlcement making plant : http://www.Hxjq-crushers.Com/5.Htmvibratory feeder : http://www.China-crusher.Com/vibrating-feeder1.Htmlrotary kiln : http://www.Hxjqcrusher.Com/rotary-kiln.Htmlsand maker : http://www.China-crusher.Com/sand-maker3.Html.

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