... one kinds of calcining machine for calcining cement,limestone,kaolin and so on A Rotary kiln is a pyroprocessing device ... sulfide ores prior to metal extraction.Principle of OperationThe kiln is a cylindrical vessel, inclined slightly to the horizontal ... kiln are the shell, the refractory lining, support tyres and rollers, drive gear and internal heat exchangers. high grade rotary kiln/calcining machine ...