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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 269 Documents
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SEPARATION OF WARINGIN HEAVY MINERAL SANDS FROM CENTRAL KALIMANTAN NURYADI SALEH; PRAMUSANTO PRAMUSANTO
Indonesian Mining Journal Vol 15 No 1 (2012): INDONESIAN MINING JOURNAL Vol. 15 No. 1 February 2012
Publisher : Balai Besar Pengujian Mineral dan Batubara tekMIRA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30556/imj.Vol15.No1.2012.472

Abstract

Central Kalimantan has grown rapidly as a heavy mineral producer. Zircon is the main mineral concentrate, but other valuable heavy minerals are present. With particular interest in the upgrading of zircon and its recovery, tekMIRA’s laboratory has developed benefi ciation steps of heavy minerals to produce marketable zircon con- centrate. Using a series of concentration equipments that includes spiral concentrator, shaking table, magnetic separator and electrostatic separator; the content of zircon in the end concentrate reaches up to 65% ZrO2.
THE USE OF SUB-BITUMINOUS COAL IN COMBINATION FIRING FOR TILE, BRICK AND LIMESTONE BURNING SUMARYONO SUMARYONO
Indonesian Mining Journal Vol 15 No 1 (2012): INDONESIAN MINING JOURNAL Vol. 15 No. 1 February 2012
Publisher : Balai Besar Pengujian Mineral dan Batubara tekMIRA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30556/imj.Vol15.No1.2012.473

Abstract

Combination fi ring of fi rewood and bituminous coal was recommended to reduce fi rewood consumption and to increase energy effi ciency. However, bituminous coal deposit in Indonesia has been depleted, therefore the use of sub-bituminous coal for combination fi ring should be promoted. In this work the use of sub-bituminous coal for combination fi ring was investigated in tile, brick and limestone burning. The calorifi c value of the sub-bituminous coal was only 4.6% lower than the value of bituminous coal. The increase in energy effi ciencies using sub- bituminous coal were lower than that of using bituminous coal. Compared with the use of fi rewood alone the increase in energy effi ciencies using combination fi ring of fi rewood and sub-bituminous coal in tile, brick and limestone burning were 45.7, 53.6 and 28.3% respectively. While, in the use of bituminous coal, the increase were 70.8, 75.1 and 91.9% respectively. In the combination fi ring, the fi rewood substituted by coal using sub-bituminous coal were smaller than the use of bituminous coal, i.e. for tile, brick and limestone burning, using sub- bituminous coal the substituted fi rewood were 47.7, 44.6 and 45.0% respectively while using bituminous coal there were 54.5, 50.0 and 66.0% respectively. It was revealed that the superiority of bituminous coal come from its higher content of high hydrocarbon volatiles which produced higher radiative fl ame resulting more effi cient burning processes.
DOMESTIC MARKET OBLIGATION (DMO) POLICY AND ITS IMPLEMENTATION STRATEGIES RIDWAN SALEH
Indonesian Mining Journal Vol 15 No 1 (2012): INDONESIAN MINING JOURNAL Vol. 15 No. 1 February 2012
Publisher : Balai Besar Pengujian Mineral dan Batubara tekMIRA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30556/imj.Vol15.No1.2012.474

Abstract

The increasing of coal consumption in various industries in Indonesia causes the increasing of coal domestic demand. On the other hand, the sharp increasing of coal production almost 16 times during 17 years is exported (75%) in majority. By using the polynomial quadratic approach, in year 2025, coal production is projected as 741 million tons (176% to National Energy Policy target as 421 million tons), coal exports as 509.3 million tons (275% to National Energy Policy target as 185 million tons) and domestic demand as 236 million tons. This is in accordance with the National Energy Policy (KEN=Kebijakan Energi Nasional) target. The presence of Government Regulation Number 34 year 2009 on the Domestic Market Obligation (DMO) is a breakthrough to solve the above problems. It is a challenge for the government as a regulatory board to implement this policy. Some strategic alternatives to implement this policy is by using the Budget Activities Plan (Rencana Kegiatan Anggaran Belanja = RKAB) instruments optimally, control system effectivity, and punish- ment applying consistency.
EFFECT OF BOKASHI BOTTOM ASH DOSAGES ON THE GROWTH OF VETIVER GRASS (Vetiveria zizanioides) AND ITS LEAD CONTENT NUNUNG SONDARI
Indonesian Mining Journal Vol 14 No 3 (2011): INDONESIAN MINING JOURNAL Vol. 14 No. 3 October 2011
Publisher : Balai Besar Pengujian Mineral dan Batubara tekMIRA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30556/imj.Vol14.No3.2011.481

Abstract

The experiment was conducted at a greenhouse of Agricultural Faculty of Winaya Mukti University Tanjungsari Sumedang, West Java, from May to October 2009. The objective of this research was to see the effect of the bokashi bottom ash application on the growth and of vertiver grass and its lead content. The experiment used the environmental design of Randomized Block Design (RBD) that consist of five treatments and is repeated five times. The factor was the bokashi bottom ash dosages ( 0,5,10, 15, and 20 t ha-1 ). The results show that the application of bokashi bottom ash affected the growth of vetiver grass, except shoot root ratio. The dosage of 15 t ha-1 presented a good effect to the plant height, the number of leaves and tillers. The bokashi bottom ash with dosage of 20 t ha-1 wasthe best effect in absorbing lead applied to vetiver grass.
EFFECTS OF TEMPERATURE AND NUTRIENT FEED ON THE PRODUCTION OF OXALIC ACID BY ASPERGILLUS NIGER SRI HANDAYANI
Indonesian Mining Journal Vol 14 No 3 (2011): INDONESIAN MINING JOURNAL Vol. 14 No. 3 October 2011
Publisher : Balai Besar Pengujian Mineral dan Batubara tekMIRA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30556/imj.Vol14.No3.2011.482

Abstract

Oxalic acid is an important organic material used for rare earth metal extraction precipitator, metallic equip- ment purificant and purification of industrial minerals. Aspergillus niger is known to be able to produce a high concentration of oxalic acid using glucose as carbon and energy sources. For further process optimiza- tion, submerged fermentation experiments were carried out to study the effect of temperature and nutrient feed on the production of oxalic acid from medium containing glucose 35g/L. An increase in temperature process from 25 to 30°C allowed the productivity to significantly increase from 75.50 to 81.06% of theoretical yield with a final oxalic acid concentration of 17.04 g/L reached after 9 days of process. When operating at more controlled fermentor with fed-batch system, both productivity and oxalic acid concentration were markedly improved (88.01% of theoretical yield and 19.52 g/L respectively). The later system gave excel- lent yield almost 90% of theoretical yield as a prerequisite of economical value.
PRELIMINARY STUDY OF PARTICLE SIZE MEASUREMENT OF FINE PHOSPHATE ROCKS USING DYNAMIC LIGHT SCATTERING METHOD AGUS WAHYUDI; SARIMAN SARIMAN; SITI ROCHANI
Indonesian Mining Journal Vol 14 No 3 (2011): INDONESIAN MINING JOURNAL Vol. 14 No. 3 October 2011
Publisher : Balai Besar Pengujian Mineral dan Batubara tekMIRA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30556/imj.Vol14.No3.2011.483

Abstract

Particle size measurement is an important role in the utilization of phosphate rocks for nanofertilizer. In this study, the phosphate rocks from Wonosari and Ciamis were milled by planetary ball mill (PBM) into submicron size (0.19 μm). Measurements of the submicron size were conducted using a dynamic light scattering (DLS) method, i.e. iluminating. The milled products were also compared to the milled zeolite and bentonite from the same PBM. There is a relationship between the particle milled size and its chemical composition. The correlation is interpreted as the result of different hardness in minerals content.
ORGANIC PETROLOGY OF SELECTED COAL SAMPLES OF EOCENE KUARO FORMATION FROM PASIR AREA-EAST KALIMANTAN BINARKO SANTOSO
Indonesian Mining Journal Vol 14 No 3 (2011): INDONESIAN MINING JOURNAL Vol. 14 No. 3 October 2011
Publisher : Balai Besar Pengujian Mineral dan Batubara tekMIRA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30556/imj.Vol14.No3.2011.485

Abstract

Eight samples of Eocene Kuaro Formation were taken from Pasir area, East Kalimantan to be examined their lithotype, maceral, mineral matter and rank of the coals in terms of geologic factors. The samples were analysed according to the ASTM (2009). The result shows the dominance of brighter lithotypes and vitrinite over liptinite, inertinite and mineral matter. There is a strong correlation between lithotype and maceral composition of the coals. The brighter lithotypes have high vitrinite content. This indicates that the coals were formed under a wet condition. The presence of high content of pyrite and calcite reflects marine incursion, in which the coals were deposited under paralic and shallow marine environment. Thus, this environment strongly supports the above correlation, where the coals were formed under the wet condition. The slight differences in the coal type can be caused by the relatively short period of peat accumulation and similarity in climate during the peat formation, and slight differences in geological setting during the Eocene period. Vitrinite reflectance (Rvmax%) values show similar ranks (mostly subbituminous A to high volatile bitumi- nous C) with a slight difference due to the thickness of cover during the coalification.
LEACHING THE LEAD FROM ANODE SLIME BY AMMONIUM ACETATE SOLUTION Isyatun Rodliyah; Ngurah Ardha; Nuryadi Saleh; M. Zaki Mubarok
Indonesian Mining Journal Vol 14 No 3 (2011): INDONESIAN MINING JOURNAL Vol. 14 No. 3 October 2011
Publisher : Balai Besar Pengujian Mineral dan Batubara tekMIRA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30556/imj.Vol14.No3.2011.488

Abstract

Selective leaching the lead from anode slime from PT. Smelting (PTS) was investigated. The presence of large amount of lead in electrometallurgical anode slime courses of extraction of precious metals (Au, Ag) and other valuable metals (Bi, Se, Te, Pt and Pd) from the slime is more difficult. A process for taking off lead content in anode slime was subjecting the latter to first and second-stage leaching in a medium of an ammonium acetate solution at temperature not exceeding 80°C. Whereby lead dissolution is maximized and other metals are minimized. The effects of various parameters such as solvent concentration, leaching time, temperature, and solid/liquid ratio on the percent extraction of lead were studied. The highest recovery of lead is attained 94.9% Pb at the leaching temperature of 70°C, solvent concentration of 8 M and percent solid 20% after 120 minutes of leaching time. The leaching kinetics of lead sulfate in an ammonium acetate solution followed the ash diffusion control model and this further confirms that the activation energy of leaching is found to be 4.8 kcal/mol, to show that rate reaction can increased by mixing.
MINERALOGICAL CHARACTERS OF KARANG PANINGAL EPITHERMAL VEIN DEPOSITS, WEST JAVA TATANG WAHYUDI
Indonesian Mining Journal Vol 14 No 2 (2011): INDONESIAN MINING JOURNAL Vol. 14 No. 2 June 2011
Publisher : Balai Besar Pengujian Mineral dan Batubara tekMIRA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30556/imj.Vol14.No2.2011.493

Abstract

Karang Paningal gold-ore deposits belong to the epithermal deposits. As hydrothermal deposits, the alter- ation that occurs in this area comprises argillitization, sericitization and silicification. The gold is included within several veins that perform three texture types, namely chalcedony, comb and vuggy. Based on its mineral contents and vein deposit types, mineralization at Karang Paningal took place in two stages that was early epithermal process producing comb-vuggy vein deposit and final epithermal deposit retaining chalcedony vein deposit. Zone of prospective mineralization takes place within vein and rocks beneath and above veins
GEOLOGIC ASPECTS CONTROLLING MACERAL AND MINERAL MATTER CONTENT OF SATUI COALS- SOUTH KALIMANTAN BINARKO SANTOSO
Indonesian Mining Journal Vol 14 No 2 (2011): INDONESIAN MINING JOURNAL Vol. 14 No. 2 June 2011
Publisher : Balai Besar Pengujian Mineral dan Batubara tekMIRA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30556/imj.Vol14.No2.2011.494

Abstract

Coal deposits were formed in Tertiary sequexnces in Satui area of Asem-Asem Basin, South Kalimantan. The coals were deposited in paralic to neritic environments. Lithotype of Satui coals is dominated by bright- banded and banded. Petrographically, vitrinite and liptinite are the dominant macerals in the Eocene coals. Inertinite is a minor component. Mineral content is relatively high in most of the coals. There is a significant relationship between lithotype and petrographic observations; the brighter coal is in association with the vitrinite-rich coal. The differences in the coal type are due to the interaction of geologic factors. There is a good correlation among lithotype, petrographic composition and geologic aspects that clearly influence the characteristics of the coals. The ranks of the Eocene coals ranging from brown coal to high volatile bitumi- nous indicate a normal regional coalification.

Page 10 of 27 | Total Record : 269

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