Indonesia's green petroleum coke production capacity reaches 360,000 tons/year. Green Petroleum Coke (GPC) is the most widely used raw material in the manufacture of anodes for aluminium and steel smelters, but it is does not have good quality for smelting because it contains high ash, volatile matter and carbon. It is necessary to produce CPC that meets industry standards. Calcined Petroleum Coke (CPC) is produced from calcined coke technology by heating coke to a high temperature of 550-1,150 °C using a rotary kiln or vertical shaft kiln. The calcination process mostly determines the characteristic quality of the petroleum coke produced. This study will compare the advantages of product characteristics resulting from calcination technology between rotary kilns and shaft kilns and analysed calcined coke using Aspen Plus to produce high quality coke products that meet industry demand parameter standards; sulphur content (0.5-1.5%), fixed carbon (99.3%), volatile matter (0.5%) and ash (0.5%) and reduction of wasted CO2 gas emissions. thus can support the mining industry. Mining down streaming also encourages the country's foreign exchange savings and boosts the domestic economy. Thus, Indonesia can produce economical steel and smelters.