Co-processing of Scrap Tires and Waste from the Re-refining of Used Lube Oil in Cement Kilns

Rogerio Jose da Silva, Renata Vitor Chaves S. G. Francisco, Alexandre Oliveira Lopes

The cement industry has a high consumption of thermal energy through the burning of fuels. The use of wastes as alternative fuels allows, through co-processing, its destruction and the use of its calorific value in the production process. Scrap tires and the wastes generated in re-refining of used motor oil has been used in co-processing in cement kilns due the increase of automotive vehicles. Co-processing has multiple variations according to its location, the productive process and its facility. This way, it is possible to reach high thermal destruction efficiency and low emission of pollutants. This paper analysis the environmental and production restrictions that determine the use limits of waste in the kiln, when the main fuels are petroleum coke or coal and the waste co-processing occurs in rotary kiln with preheaters stages, precalciner with tertiary air and grate coolers.