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The most notable way that reducing energy helps the environment is by decreasing power plant and general industry emissions. Coprocessing of wastes in cement rotary kilns is the use of suitable waste materials in cement manufacture processes for energy recovery and raw material conservation. The correct use of wastes and by-products as alternative fuels and raw materials (AFR) has a range of environmental and socio-economic advantages, notably through the important role of cement kilns in recycling and recovery programmes due to their high level of temperatures and residence time with economic and ecological benefits. The objective of this work is to reach high substitution rates regarding the total quantity of alternative materials required in cement manufacture by determining a range of limit values for waste streams and waste content proportions with respect to the main raw materials and waste compositions and limit values for emissions and clinker quality.