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what is the 21 world 39s rotary kiln

A precalciner rotary kiln system 1 for cement manufacture According to the invention there is provided an oxygen source 20 connected to the hot air duct 16 leading to the precalciner 10 of the precalciner rotary kiln system through a dosage unit comprising an endless header pipe 22 provided around the hot air duct and connected to the oxygen source through an oxygen inlet line 23

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