Jul 31 2017 · Each shaft produces approx 120 kg h CPC or 3 8 tph for all 32 shafts respectively 92 tons per day and kiln Calcination The Green Petroleum Coke feed on top of the shaft kiln the coke moves downward through the kiln where due to the slow movement of the coke through the Calcining unit all coke particles reach maximum Calcination temperature