Two tires are all you need: modern kiln technology

The development of the two-tire kiln emerged in the late 1970s as a consequence of improving precalciner technology. As the precalcining rate approached 95% the rotary kiln had only to perform clinkering processes. To accomplish this task a 10-12:1 length to diameter (L/D) ratio is sufficient. The development has significant mechanical as well as process advantages, as the kiln may now be supported simply on two-tire stations. Since the first successful installation of a true two-tire kiln in 1980, many other installations have come on line, all of them successful. The vast industrial experience now available clearly shows that the two-tire kiln is applicable for all modern precalciner pyro-systems regardless of raw mix, fuel type or production requirements