Jurnal Puslitbang tekMira (Teknologi Mineral dan Batubara)
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ANALYSIS ON TERMS OF TRADE OF INDONESIA’S NICKEL
No full textThe import-export trade of nickel Indonesia until 2013 was always in a less prestigous position. It is due to the entire production of nickel is exported in raw materials, while nickel is continued to be imported to meet the industrial needs of stainless steel, nickel alloys, batteries and nickel metal alloys in the country. This study aims to analyze the advantages and disadvantages of export and import of nickel with a terms of trade analysis in net barter, which measures the ratio of the nickel export price with imports price, and gross barter measures the ratio of the nickel export volume to the import volume. Net barter of the analysis results shows that in 2007, the nickel export price was only 0.0121 times than the nickel import price, while gross barter indicates that the export volume was 11044.87 times compared to the import volume. Volume and value of the exports are in nickel ore), while imports in nickel oxide sinters, product of nickel metallurgy, nickel alloys, nickel waste and scrap and nickel powders and flakes. The analysis overview of nickel gives an indication that international trade (export-import) of nickel has not provided an optimal impact on the national and regional economy
ANALYZING CHEMICAL KINETICS OF COAL GASIFICATION IN MINI GASIFIER REACTOR
No full textCoal gasification is a chemical reaction that has a purpose to change the original solid coal into gaseous compounds. Converting the coal into gaseous compounds will make the combustion process easier and results in increasing combustion efficiency. The sulfur and nitrogen are also easier to be separated in order to obtain cleaner flue gas. This paper presents kinetic analysis of coal gasification reactions in mini gasifier (or known as GasMin in Bahasa) reactor. The results show that the increase of the air-coal ratio (ACR) affected the maximum temperature of the reactor, which means that an increase of the intake air flow rate will increase the amount of oxygen for combustion reaction. Meanwhile, the increase of the team coal ratio (SCR) will increase flow rate of the mixture of air-steam feed. As a result, the ability of coal gasification has also increased. This will increase gasification efficiency around 3-5% which then will also increase the gas yield. The maximum value of SCR was 0.06, further than that of the yield gas and the q- value will slightly decrease. The simulation result showed that the producer gas was dominated by CO with 26.72% mole fraction; H2 with 14.06% mole fraction, and N2 with 47.88% mole fraction. Meanwhile CO2, CH4 and O2 mole fraction were 5%, 0.24%, and 1.20% respectivel
