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Bachtiar Effendi
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INDONESIA
Indonesian Mining Journal
Published by Balai Besar Pengujian Mineral dan Batubara tekMIRA
ISSN : 08549931     EISSN : 25278797     DOI : 10.30556/imj
Core Subject : Science, Social, Engineering,
Chemical Engineering, Chemistry & Bioengineering Chemistry Energy Environmental Science Materials Science & Nanotechnology
This Journal is published periodically two times annually : April and October, containing papers of research and development for mineral and coal, including exploration, exploitation, processing, utilization, environment, economics and policy. The editors only accept relevant papers with the substance of this publication.
Arjuna Subject : Energi (semua kategori) - Energi (Lain-Lain)
Articles 5 Documents
 1 
Search results for , issue "Vol 11 No 2 (2008): INDONESIAN MINING JOURNAL Vol. 11 No. 2 June 2008" : 5 Documents clear
THE CURRENT STATUS OF IRON MINERALS IN INDONESIA Siti Rochani; SARIMAN SARIMAN; Rezky Iriansyah Anugrah; Pramusanto Pramusanto
Indonesian Mining Journal Vol 11 No 2 (2008): INDONESIAN MINING JOURNAL Vol. 11 No. 2 June 2008
Publisher : Balai Besar Pengujian Mineral dan Batubara tekMIRA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30556/imj.Vol11.No2.2008.590

Abstract

Indonesia has great iron mineral resources, comprising primary iron ore (17 %), iron sand (8 %) and lateritic iron ore (75 %). Nowadays, Indonesia’s primary iron (hematite, magnetite) has not been em- powered yet, due to the scattered area of the resources location. Meanwhile, national iron sand is commonly used for cement industries and its potency has not supported national steel industries yet because of low iron content (45-48 %). However there is an opportunity to be processed by using Ausmelt process technology. At present, lateritic iron ore is being used as coal liquefaction catalyst in the form of limonite, but hydrometallurgy would be a promising solution to beneficiate lateritic iron ore for steel industries.
TEST OF REMOVAL OF IRON MINERALS FROM KAOLIN USING HGMS Lili Tahli
Indonesian Mining Journal Vol 11 No 2 (2008): INDONESIAN MINING JOURNAL Vol. 11 No. 2 June 2008
Publisher : Balai Besar Pengujian Mineral dan Batubara tekMIRA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30556/imj.Vol11.No2.2008.591

Abstract

Kaolin from Nagreg contains iron mineral particles approximately 0.58 % Fe that cause a grey color of the material . An effort to reduce iron content can be made by applying beneficiation test, using HGMS (High Gradient Magnetic Separator), so the kaolin may become white color and can reach the standard quality for paper industries. A HGMS beneficiation test was conducted at magnetic field strength of 5,000 Gauss. The experi- ments were carried out using variable flow rates of 1, 1.5, 2, 2.5, 3 and 3.5 liter per minute and slurry density of 2.5, 5, 7.5, 10, 12.5 and 15 % solid. The results of experiments show that the optimum condition with flow rate of 2.5 liters/minute gave the quality of kaolin concentrate with iron content of 0.29 %Fe.
MAGNETIC SUSCEPTIBILITIES DISTRIBUTION AND ITS POSSIBLY GEOLOGICAL SIGNIFICANCE OF SUBMERGED BELITUNG GRANITE DIDA KUSNIDA; P. Astjario Astjario; B. Nirwana
Indonesian Mining Journal Vol 11 No 2 (2008): INDONESIAN MINING JOURNAL Vol. 11 No. 2 June 2008
Publisher : Balai Besar Pengujian Mineral dan Batubara tekMIRA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30556/imj.Vol11.No2.2008.592

Abstract

An appraisal of the marine magnetic anomalies over the Belitung water provides information on the distribution of the magnetic susceptibility values. The 0.001 to 0.003 cgs unit contour values charac- terize the zone of submerged Belitung granite coincides with the zone of less than 50 nT total mag- netic anomaly contour value. Susceptibilities distribution analyses reveal a strong correlation between magnetic susceptibility and type of granites. The nature of submerged Belitung intrusive is suggested to be granitic pluton of biotite-granite that is associated with cassiterite minerals.
THE AVAILABILITY OF INDONESIAN OIL PRODUCT THAT IS USED IN THE UPGRADED BROWN COAL PROCESS Iwan Rijwan; BUKIN DAULAY; Gandhi Kurnia Hudaya
Indonesian Mining Journal Vol 11 No 2 (2008): INDONESIAN MINING JOURNAL Vol. 11 No. 2 June 2008
Publisher : Balai Besar Pengujian Mineral dan Batubara tekMIRA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30556/imj.Vol11.No2.2008.593

Abstract

Indonesian coal has a potential to be a major future primary energy source due to its large resource, easy and low cost of exploitation, good quality and supported by appropriate infrastructure. However, more than 65% of the coal resources are categorized as LRC and this type of coal needs to be upgraded before it is used and transported for a long distance. One of the upgrading processes is UBC. Kerosene, LSWR and spray oils are used for UBC process as heating media, material for closing coal pores and oil for briquette machine, respectively. The specification and price of kerosene in Indonesia which is used for both household and industries are controlled by PT PERTAMINA. However in the case of LSWR, PT PERTAMINA does not control the quality and the price. Therefore in the market there are different of qualities and prices of LSWR. All oil refineries belong to PT PERTAMINA produces LSWR and kerosene. They guarantee the con- tinuity of oil supply to customer. They recommend to utilize a heavy aromatic for kerosene substitu- tion and asphalt and decant oil to substitute LSWR. The oil will be transported to the UBC plant from the nearest oil refinery using lorries or tankers transportation agency that is recommended by PT PERTAMINA.
PETROGRAPHIC ANALYSES OF COAL DEPOSITS FROM CIGUDEG AND BOJONGMANIK AREAS WITH REGARD TO THEIR UTILISATION BINARKO SANTOSO; NINING S. NINGRUM
Indonesian Mining Journal Vol 11 No 2 (2008): INDONESIAN MINING JOURNAL Vol. 11 No. 2 June 2008
Publisher : Balai Besar Pengujian Mineral dan Batubara tekMIRA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30556/imj.Vol11.No2.2008.594

Abstract

Geological setting of the Cigudeg and Bojongmanik areas gives rise to the coal characteristics, par- ticularly due to the depositional environment and stratigraphic aspect. Those characteristics include lithotype, type and rank of the coals. The coals formed under wet-swamp condition to result in brighter lithotype and vitrinite-rich coal. By contrast, the coals formed under dry-swamp condition to result in duller lithotype and inertinite-rich coal. The Cigudeg coals contain clay minerals and quartz, whilst the Bojongmanik coals contain pyrite and calcite. These minerals are beneficial to interpret depositional environment of the coals. Ranks of the Bojongmanik coals are somewhat higher (lignite-subbitumi- nous C-B) that those of the Cigudeg coals (lignite-subbituminous B) according to the ASTM classifi- cation. These higher ranks are due to the thicker overburden on the Bojongmanik coals in terms of stratigraphic aspect. Regarding those petrographic characteristics, both coals are suitable for fuel of direct combustion for the small-scale and home industries that are available in the surrounding areas. Therefore, the coals can economically cope with the demand of those industries.

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