STUDY OF UTILIZATION LOW RANK COKING COAL AS A BLEND ON THE PRODUCTION OF COKES

• Main Author: Rozak Kodarif, Abdul
• Format: Theses
• Language: Indonesia
• Subjects: Teknik kimia
• Online Access: https://digilib.itb.ac.id/gdl/view/70680
• Institution: Institut Teknologi Bandung

Coke is a product of the carbonization of a mixture of metallurgical coal which functions as a carbon source in the blast furnace process. Carbon compounds in coke will react with air and produce reducing gas in the form of carbon monoxide (CO). Indonesia is a country that has the 5th largest coal reserves in the world. This potential has not been fully exploited in the steel industry because the metallurgical coal used is entirely imported in the process of making coke. Mixed metallurgical coal used in Indonesia consists of 4 groups, namely hard coking coal which has low volatile matter content (hard coking coal low volatile), metallurgical coal hard and has medium volatile matter content (hard coking coal medium volatile), metallurgical coal tends to be hard (semi-hard coking coal) and metallurgical coal tends to be soft (semi-soft coking coal). Metallurgical coal in Indonesia is classified as semi-hard coking coal and semi-soft coking coal, in this group coal tends to have high levels of volatile matter which has an impact on reducing product recovery, so the potential for utilizing domestic metallurgical coal as a substitute for imported metallurgical coal needs to be studied further. in. Based on data on the production capacity of the coke production industry of 2055 tons per day, a simulation was carried out using Aspen Plus V11 so that it is known that the use of domestic metallurgical coal in the percentage range of 15% -35% of the total mixed metallurgical coal feed to COP can increase sulfur in coke by up to 0.535% in the use of domestic metallurgical coal as much as 35%. Optimal results from the utilization of domestic metallurgical coal were obtained by using domestic metallurgical coal as much as 25% of the total mixed coal feed to COP with the quality results of water content, fixed carbon, ash, and sulfur being respectively 7.21%; 87.75%; 1.27%; 10.98% and 0.523%. Domestic metallurgical coal utilization of 25% provides potential savings of 122 million rupiahs per day or the equivalent of 44.6 billion rupiahs per year.