Yuhong Design Calcination of Limestone in Rotary Kiln

Lime rotary kiln Introduction:
Lime rotary kiln is the key equipment for the calcination of bauxite, clinker, limestone, etc.. According to the capacity of bauxite plant, clinker or cement plant, etc., we can help you select different size of rotary kiln,which is usually from 900mm to 4000mm.  
Lime rotary kiln is mainly composed of kiln shell, refractory bricks, supporting device, supporting device with catch wheel, transmission device, lubrication device, mobile kiln head and sealing device at the end of the kiln.

Lime rotary kiln Feature:
1.  Lime rotary kiln capacity is big which is suitable for large-scale active lime production line, and the 2200TPD lime rotary kiln production line  has been put into operation in the world and many lime rotary kiln with  150-500TPD has been built with good operation situation which is suitable for applying in middle or small scale lime production.

2.The structure of kiln body is simple, airflow is unblock, the gas containing S could be exhausted in time meanwhile the S during burning is hard to adhering so the sulphur content of products is low which could meet the steel-making requirements. At the same time material will go ahead evenly inside kiln with even heating, so the quality of production is stable and crude burning rate and over-burning rate is very low thus it could calcine high activity lime for steel-making. Under the same condition, lime activity produced by rotary kiln which could be 340-380ml or even 400ml is over 30ml higher on average than that manufactured by gas kiln.
 
3. Rotary Kiln could directly calcine 10-50mm fine power limestone, normally 0-30mm fine power limestone accounting for 30-40% of total volume which couldn't be used for other type kiln. Complying with the fineness of steel raw material, sintering gradually takes use crude lime instead of limestone, as fine limestone couldn't be used comprehensively. Rotary kiln production line could not only use good limestone ore resources, but also meets the lime industry sustainable development policies.
 
4. Utilizing vertical preheater in kiln end could adequately use high temperature smoke created by calcining inside of kiln which could initially pre-break down from normal temperature preheating. This could not only largely increase output of rotary kiln, but also fully decrease heat consumption each unit product.
 
5. Utilizing vertical cooler in kiln head could not only cool quickly of high temperature lime and increase activity, but also it is convenient for conveying and saving. Meanwhile it could gain high temperature 2nd wind when entering into kiln, which could efficiently increase temperature inside of kiln, decrease burning consumption.
 
6,The temperature of smoke discharged from vertical preheater of kiln end is low, normally it is between 280-350ºC, whose dust containing is about 20g/Nm3,  this could make simple and efficient follow-up smoke treatment meanwhile the gas after treated could meet the environment protection standard.
 
7. The most important advantage of lime produced by rotary kiln is stable.  Not only for adaptability of manufacturing capacity, but also for adequately utilizing good limestone ore resources.
 

Lime rotary kiln Feature Working Principle
Rotary kiln is composed of cylinder, gears, support device, kiln liner and kiln tail sealing equipment, kiln head hood and combustion. Cylinder as heated pivoting part, made of high quality carbon steel plate, is supported on the support device by tire, and there is mechanical or hydraulic pressure catch wheel on the first or some gear in order to control the turning of cylinder. Because of the need of installation or maintenance, the bigger rotary kiln has auxiliary gears, which makes cylinder gyrate more slowly. To prevent cold air come in and dust overflow, the reliable kiln tail and head sealing equipment is installed on feed and discharge end.