Rotary kiln - WikipediaRotary kiln (rust colored horizontal tube at right) at a Wyoming cement plant. General layout of a direct fired countercurrent rotary kiln used in cement manufacture. Rotary kiln body, with drive gear and 2 tyres (riding rings). A rotary kiln is a pyroprocessing device used to raise materials to a high temperature . The hot gases may be generated in an external furnace, or may be.rotary furnace cement,Lead Rotary Furnace - OCLLead Rotary Furnace It is most widely used furnace recycling lead wastes & smelting by-products of lead refining process.