Twice each day, in the morning and at twilight, one half portion (a pras) of incense was burnt on the altar. Additionally, the blood of the inner sin-offerings, such as the bull and goat that were chosen by lottery on Yom Kippur, was sprinkled upon the Incense Altar. 
The Incense Altar Structure
Contents:   Part I,    Part II,    Part III,    Part IV,    Part V,    Part VI,    Part VII