STUDI PROSES HYDROTHERMAL DAN HIDROGENASI TERHADAP PEMBATUBARAAN BUATAN SERTA PEMANFAATANNYA SEBAGAI BAHAN BAKU KOKAS

• Main Author: YUNITA BAYU NINGSIH, RR.
• Format: Theses
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/44954
• Institution: Institut Teknologi Bandung

Most of Indonesian coal is low rank coal that requires upgrading process to increase its added value. On the other hand, the need for coke in Indonesia has increased. It is indicated by the establishment of some steel smelting companies that use coke as one of its material in the process. The type of coal that is suitable for making high quality coke is hard coking coal, whereas most of Indonesia coking coal is semi soft coking coal and soft coking coal. Therefore it is required to upgrade the low rank coal and the soft coking coal, so they can be utilized as raw material for coke. The objective of this study is to investigate the effect of hydrothermal process on artificial coalification and the influence of hydrogenation on coal caking properties. Additionally, this study also aims at obtaining the description of the coke-making from domestic raw materials that have undergone hydrothermal process and hydrogenation. <br /> <br /> <br /> Low rank coal from Jambi, coking coal from Tuhup and coking coal Marunda were used. Hydrothermal experiments for low rank coal Jambi were conducted in an autoclave at 300-3750C and 10-40 bar for 30 minutes, while for coking coal the experiments were carried out at 300-3750C and 50-150 bar for 30 - 180 minutes. Hydrogenation process was only conducted for low rank coal at 4000C with pressure as between variable 10-40 bar. <br /> <br /> <br /> The results showed that the significant artificial coalification in low rank coal Jambi occurred through hydrothermal process. By hydrothermal process, the value of reflectance for low rank coal Jambi increased from 0.27% to 0.85%, the calorific value increased from 5,714 cal / g to 7596.39 cal / g, the volatile matter content decreased from 45.8% adb to 34,15% adb, the oxygen content decreased from 26.13% to 13.95% adb and the carbon content increased from 63.73% to 76.12% adb. Thus, it can be concluded that artificial coalification reaction take places during the hydrothermal treatment of low rank coal Jambi, from subbituminous to high volatile bituminous A. Hydrothermal process also produced the hydrophobic material with water absorption capability of 0.02% per day in average. Through the process of hydrogenation, the value of free swelling index of low-rank Jambi increased from 0 (zero) to 1.5 (one point five), the oxygen content decreased from 14,56% to 2.29% adb and the hydrogen content increased from 4,76% to 7.25% adb. Carbonization of low rank Jambi, that has undergone hydrothermal and hydrogenation process, has produced coke with a compressive strength of 64.75 kg/cm2, the carbon content of 84.91% adb and the calorific value 9421.10 cal/g. Carbonization of Tuhup and Marunda coking coal that have through hydrothermal processing produces coke with the compressive strength of 68.35 kg/cm2 and 68.17 kg/cm2, the carbon content of 89.3% and 89.58% adb and 9826.05 cal / g and the calorific value of 9851.45 cal / g.