Judul: Laterit Iron Ore Reduction from Bayah, Banten Province with Coal Reductor.
Abstrak: Iron ore is one of the most usually found metal in Indonesia. The energy problems faced by the national steel industry can be reduced by using coal reductor. Indonesia is a country which has coal reserves at least 38.8 billion tons. The objectives of this research are to enrich laterite iron ore in iron rock with benefiziation, to get optimum temperature of laterite iron ore rediction, and to compare the final reduction result between calcite and bentonite addings. This research covers several stages, includes sample preparation, iron ore analysis (includes silicate, total Fe, and Fe2+), spons iron producing (iron ore reduction), spons iron analysis (includes total Fe and metal Fe), calcite and bentonite chemical composition analysis (includes CaO, MgO, and silicate), and coal analysis (includes moisture contain, volatile matter (vm), fixed carbon (fc) contain, and ash contain). Based on the results of the research is that the silicate content decreased after the benefiziation from 5.90% to 2.69%, which total Fe content has been increased from 56.70% to 64.51%. The used coal was a type of sub-degree bituminus with 47.19% fixed carbon which it was quite effective for reduction process. The function of the bentonit addings was as a sticker which can make the pellet was more better and made the metalization contain was higher than the calcite addings with respectively percentage are 82.11% and 80.63%. The range of optimum temperature of the iron ore laterit reduction from bayah is 1000oC to 1100oC. Laterit iron ore from bayah could be used as alternative raw materials for steel production.
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Judul: Biodesulfurisasi batubara Bukit Asam menggunakan Thiobacillus ferrooxidans
Abstrak: Coal is a very important non-renewable energy resource in Indonesia and many industries depend on this resource. In coal burning process, coal produces hazardous waste contains high sulfuric compound that harmful for environment as well as human. In order to reduce sulfur content in the coal, several methods could be applied. One of them is biodesulfurization of coal using T. ferrooxidans. Main objectives of this research are: 1) to know the most effective strain of T. ferrooxidans in order to reduce sulfur content in coal, and 2) to know ability of T. ferrooxidans in order to reduce sulfur content in a bioreactor. The experiments consisted of three main steps, that are: 1) Stock culture rejuvenation, 2) Strain selection, and 3) Coal desulfurization in a bioreactor. Medium that used in this research is according to Leathen et al. (1956). The result of this research show that T. ferrooxidans ICBB 9100 is the most effective strain for coal desulfurization. T. ferrooxidans strain ICBB 9100 can reduce sulfur content 77.53% within 12 days. By treatment of the coal in bioreactor, sulfur content was reduced 62.89% within 2 days by T. ferrooxidans strain ICBB 9100. Key words: coal, biodesulfurization, T. ferrooxidans
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Judul: Penerbangan Otomatis Pesawat Tanpa Awak Jenis Sayap Tetap dengan iNav
Abstrak: Pesawat tanpa awak (UAV) dapat dikendalikan secara manual dengan remote control atau secara otomatis dengan flight controller (FC). Salah satu jenis UAV adalah sayap tetap yang memiliki bentuk seperti pesawat terbang pada umumnya. Penelitian ini bertujuan untuk melakukan penerbangan otomatis pada UAV jenis sayap tetap dengan mengkonfigurasi perangkat FC. UAV yang digunakan adalah model SkySurfer X8 dengan bentang sayap 1.4 m. FC yang digunakan adalah Matek F405-Wing yang dikonfigurasi dengan perangkat lunak iNav. Berdasarkan hasil uji terbang, UAV berhasil terbang secara otomatis mengikuti skenario yang diberikan. Skenario terjauh berupa persegi berukuran 600×600 m pada ketinggian 100 m, yang ditempuh dalam waktu sekitar 2 menit dengan kecepatan sekitar 65 km/jam. Diharapkan prosedur perakitan, konfigurasi, operasi, dan hasil data uji terbang dapat menjadi acuan dalam penelitian selanjutnya.
Keyword: iNav, penerbangan otomatis, pesawat tanpa awak, sayap tetap