Jurnal Puslitbang tekMira (Teknologi Mineral dan Batubara)
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ANALISIS STATUS KEBERLANJUTAN KEGIATAN PERTAMBANGAN BATUBARA DI KOTA SAMARINDA PROVINSI KALIMANTAN TIMUR
No full textKegiatan pertambangan batubara di Kota Samarinda berdampak terhadap dimensi ekonomi, lingkungan, sosial, hukum, infrastruktur dan teknologi. Penelitian ini mengkaji indeks keberlanjutan dari dimensi-dimensi tersebut di atas terhadap kegiatan pertambangan di Kota Samarinda. Temuan dari penelitian ini adalah: 1) masyarakat mempunyai persepsi yang negatif terhadap kegiatan pertambangan, 2) indeks keberlanjutan multidimensi sebesar 47.57 yang termasuk sebagai kurang berkelanjutan.Untuk memperbaiki indeks keberlanjutan tersebut, kebijakan harus difokuskan pada pengendalian tingkat gangguan kegiatan pertambangan batubara terhadap ekosistem, dan harus didukung dengan penegakan hukum terhadap perusakan lingkungan, pengembangan kemampuan sumber daya manusia dan pengembangan masyarakat
REDUCTION OF GOETHITIC IRON ORE USING THERMOGRAVIMETRIC METHOD
No full textCompared to main iron ore minerals, either hematite or magnetite, Indonesian goethite is relatively abundant. However, this is not common to be used as feed material in iron making industries. Limitation in Indonesian high quality iron ore resources, the iron making industries have to seek another iron source such as the low grade iron ore of goethitic ore. Evaluation using thermogravimetric method was employed for analyzing behavior of goethitic composite pellet during reduction. The data show that reduction of goethitic iron ore is started by transforming goethite to hematite and then followed by iron reduction. The reduction was started by Fe3O4 formation at 442 °C and Fe at 910 °C. At those temperatures the composite pellet lost its weight. Identifying the FeO is hardly difficult due to the short range of phase existence
STUDY OF BATCH SCALE-UP BENTONITE ACTIVATION USING SULFURIC ACID
No full textAs a commodity for industrial applications, bentonite is needed in a large number of tonnages. Indonesia retains about 6 hundred million tons of bentonite resources, but its quality does not yet satisfy industrial spesifi cation. Most Indonesian bentonite is calcium-bentonite type. Therefore, it is necessary to activate the material to en- hance its absorption ability for decolorizing crude palm oil in cooking oil industries. This research was aimed to obtain the optimal bleaching power in order to decolorize the crude palm oil effectively. The batch scale bentonite activation used raw material from Sarimanggu, Tasikmalaya district, West Java. Since 40 %-solid gave a better average bleaching power value than that of 20 %, the activation was then focused at seeking the best condition with regards to the activition time (hour) and reagent dosages (sulfuric acid). The batch up scale of this research refered to the use of a 100-kg bentonite as the feed. The feed size was -10 mesh. The use of sulfuric acid was2.5 to 20 % (equivalent to 0.13 to 1.02 N) for 20 % solid and 2.5 to 15 % (equivalent to 0.34 to 2.04 N) for 40 % solid. A series of activation times was 1, 2, 3, 4, and 5 hours. It started when sulfuric acid has been depleted. Sampling was completed for each hour when a sample was neutralized until pH = 7. The sample was dried and the rest of bentonite slurry was fl owed into a dilution tank to be neutralized using water. Condition of 1-hour activation and 7.5 %-sulfuric acid (equivalent to 1.02 N) provided the best bleaching power value (88 %)