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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 277 Documents
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CHARACTERISTICS OF SELECTED SUMATERAN TERTIARY COALS REGARDING THEIR PETRO- GRAPHIC ANALYSES BUKIN DAULAY; BINARKO SANTOSO
Indonesian Mining Journal Vol 11 No 1 (2008): INDONESIAN MINING JOURNAL Vol. 11 No. 1 February 2008
Publisher : Balai Besar Pengujian Mineral dan Batubara tekMIRA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30556/imj.Vol11.No1.2008.599

Abstract

Type and rank variation of selected Sumateran (Ombilin and Bukit Asam) Tertiary coals were as- sessed by petrographic examination of 170 samples. The coals are dominated by vitrinite, common liptinite and rare inertinite and mineral matter. Vitrinite macerals are dominated by detrovitrinite and telovitrinite. Resinite, cutinite and suberinite are the dominant liptinite macerals in the coals. Inertinite macerals in the coals consist of semifusinite, sclerotinite and inertodetrinite. The higher vitrinite re- flectance of some coals is a result of the local and variable effects of igneous intrusions in both areas. Similarities in the type and rank characteristics in the coals reflect their geological setting, climatic influence and peat conditions.
APPLICATION OF REVERSE FLOTATION METHOD FOR THE UPGRADING OF IRON OXIDE CONTAINED IN CALCINE LATERITE ORE PRAMUSANTO PRAMUSANTO; NURYADI SALEH; MUTA’ALIM MUTA’ALIM; YUHELDA DAHLAN; Muchtar Aziz
Indonesian Mining Journal Vol 11 No 1 (2008): INDONESIAN MINING JOURNAL Vol. 11 No. 1 February 2008
Publisher : Balai Besar Pengujian Mineral dan Batubara tekMIRA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30556/imj.Vol11.No1.2008.600

Abstract

Reverse flotation was adopted for Indonesian iron-rich laterite ore from Pomalaa to float siliceous minerals in the separation of iron mineral. Nickel siliceous mineral such as garnierite is one of the silicate minerals containing in laterite ore that are undesirable and must be eliminated from the ore before used as raw material for iron making industry. Calcine laterite product was obtained from reduction process in rotary kiln for 3 hours at 900 °C by transforming limonite/goethite to magnetite containing Fe 45.6 % and Ni 1.16 %. The reverse flotation tests were focused on the separation of iron mineral from nickel mineral using amine complex, ARMAC-C, a commercially available amine thioacetate as collector. Influences of pulp pH, dosages of collector amine complex and frother, and also solid percent of pulp on the reverse flotation of calcine laterite ore were investigated. The optimal condition was obtained at pH 10, collector 1000 g/t and frother 25 g/t at solid percent of 30%. The test results show that after one-stage rough reverse flotation the concentrate had Fe and Ni grades of 77.5% and 0.5% with recoveries of 57.3% and 33.7%, respectively. Therefore, it is possible to use iron-rich lateritic ore to produce magnetic concentrates by using magnetizing roasting followed by reverse iron flotation.
EFFECT OF DISPERSING AND STABILIZING ADDITIVES ON RHEOLOGICAL CHARACTERISTICS OF THE UPGRADED BROWN COAL WATER MIXTURE DATIN F. UMAR; BUKIN DAULAY
Indonesian Mining Journal Vol 11 No 1 (2008): INDONESIAN MINING JOURNAL Vol. 11 No. 1 February 2008
Publisher : Balai Besar Pengujian Mineral dan Batubara tekMIRA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30556/imj.Vol11.No1.2008.601

Abstract

The preparation of upgraded brown coal water mixture (UBCWM) by using an Indonesian upgraded coal that was produced by an upgraded brown coal (UBC) process in pilot scale, was carried out to obtain the effect of dispersing and stabilizing additives on rheological behaviour of the UBCWM. Three kinds of anionic dispersing additives, naphthalene sulfonate formaldehyde condensate (NSF), polymethacrylate (PMA) and polystyrene sulfonate (PSS) and three kinds of stabilizing additives, carboxyl methyl cellulose (CMC) an organic material a derivative of cellulose, rhansam gum (S-194) and gellan gum (S-60) some kinds of bio poly sacharide the trade mark of Dainippon Pharma- ceutical Co. Ltd. were used in this study. Results indicate that the addition of NSF 0.3 wt% together with S-194 0.01 wt% is effective in preparing UBCWM with good slurry ability and stability, based on its rheological characteristics (apparent viscosity at shear rate of 100 s-1 and yield stress at zero point of shear rate). Since the price of S-194 is expensive, the addition of CMC 0.01 wt% is also effective in preparing stable UBCWM.
THE INFLUENCE OF ACTIVATED ZEOLITE ON THE DECREASING OF NH3 CONCENTRATION IN FISH POND WATER Daman Suyadi; M. Ulum A. Gani
Indonesian Mining Journal Vol 11 No 1 (2008): INDONESIAN MINING JOURNAL Vol. 11 No. 1 February 2008
Publisher : Balai Besar Pengujian Mineral dan Batubara tekMIRA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30556/imj.Vol11.No1.2008.602

Abstract

A research on the utilization of zeolite from Tadisi Village, Sumarorang, Polmas, West Sulawesi had been carried out. The objective of this research is to identify the influence of activated zeolite both physically and chemically on the decreasing of NH3 concentration in fish pond water. The physical activation in this research was done by heating of zeolite samples at the temperature of 100, 200 and 300°C , while the chemical activation was carried out by using reagent of NaOH with the concentration of 2 N. The particle size of the zeolite used in this research was – 4 + 10 mesh and the weight of activated zeolite samples put into the fish pond water samples were 1; 5; and 10 grams with contact time of 0, 1, and 5 days, respectively. The optimal result of this research indicated that by the addition of 5 grams of the activated zeolite (which had been activated at the temperature of 300°C with contact time for one day), the NH3 concen- tration of fish pond water samples decreased as much as 54.97 %. The addition 10 grams of the activated zeolite (which had been activated by NaOH with concentration of 2 N with contact time for five days showed the optimum result by decreasing of the NH3 concentration in fish pond water samples as much as 45.01 %.
STUDY OF IN SITU CYANIDE DETOXIFICATION ON GOLD PROCESSING TAILING AT PONGKOR GOLD MINE Lili Tahli; Tatang Wahyudi
Indonesian Mining Journal Vol 11 No 1 (2008): INDONESIAN MINING JOURNAL Vol. 11 No. 1 February 2008
Publisher : Balai Besar Pengujian Mineral dan Batubara tekMIRA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30556/imj.Vol11.No1.2008.603

Abstract

Currently, gold processing unit at Pongkor mine processes cyanide-containing waste at the end pipe or known as final process. Due to the increase of environmental awareness from the community, such a process needs to be re-evaluated. This relates to tight regulation regarding safe waste prior to releasing to the nature. Conflicts will arouse when population at surrounding area increases fast. To anticipate such conflicts, the gold processing unit of Pongkor mine proposes a scenario dealing with waste processing improvement from the end pipe process to the whole one. It includes reagent use optimization and waste minimization including its recycle. In situ cyanide detoxification is one of waste minimization processes conducted at Pongkor mine. In terms of comparing which one of the methods is the best in reducing cyanide within wastes, a series of cyanide reduction tests employed Inco’s and Degussa methods at a laboratory scale. To reduce high cyanide concentration of the wastes, the used reagents in Inco’s method include Na2 S2O5, CuSO4.5H2O and pressured by the air while Degussa method applied H2O2 and CuSO4.5H2O. The results from this experiment suggest that Inco’s technology is able to detoxify cyanidation effluents better than that of Degussa technology.
COMPARATIVE PETROGRAPHY OF OMBILIN AND BAYAH COALS RELATED TO THEIR ORIGIN BINARKO SANTOSO; BUKIN DAULAY
Indonesian Mining Journal Vol 10 No 3 (2007): INDONESIAN MINING JOURNAL Vol. 10 No. 3 October 2007
Publisher : Balai Besar Pengujian Mineral dan Batubara tekMIRA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30556/imj.Vol10.No3.2007.608

Abstract

Two coalfields have been contrasted and compared on the basis of qualitative and quantitative stud- ies of macerals and minerals. Petrological comparison of the coals indicates that vitrinite and liptinite contents within Ombilin coal are higher than those of the Bayah coal. The inertinite content of both coals is somewhat similar. Mineral matter of Bayah coal is higher than that of Ombilin coal. The vitrinite reflectance and rank of the Ombilin coal is higher and thus, its coal rank (sub-bituminous to anthracite) is better than that of the Bayah coal (sub-bituminous to medium volatile bituminous). A clear distinction between the Ombilin and Bayah coals is not possible with petrographic methods alone, and other geological parameters have to be considered. The maceral compositions of the Ombilin and Bayah coals are slightly different from each other due to intrusion effect. In the thermally affected coals from both areas, liptinite generally cannot be distinguished from vitrinite and therefore it appears to contain high proportion of vitrinite (>90 %). However, thermally unaffected coals from both coalfields contain <90 % of vitrinite. Liptinite maceral is common in coals unaffected by contact alteration with some samples containing up to 10 %. In contrast, thermally affected coals have trace amounts of liptinite. Both thermally affected and affected coals contain rare inertinite with some samples containing up to 7 %. In some cases, coals with high inertinite content have a relatively high amount of mineral matter. The Ombilin and Bayah coals show variable vitrinite reflectances, due to igneous intrusion factor. Coal of lower rank has been metamorphosed to bituminous or anthracitic ranks. The extent of rank increase depends primarily on distance from the intruding igneous rock, but it may also be related to size and temperature of the intrusion. As the vitrinite reflectance (Rvmax) values of the Ombilin coal (0.62-4.69 %) are higher compared to the Bayah coal (0.53-1.23 %), this suggests that the heat source to the thermally affected coals is closer in the Ombilin coal than that of in the Bayah coal.
EFFECT OF COAL UPGRADING ON RHEOLOGY OF COAL WATER MIXTURE DATIN F. UMAR; BUKIN DAULAY; HIROMOTO USUI; YOSHIYUKI KOMODA
Indonesian Mining Journal Vol 10 No 3 (2007): INDONESIAN MINING JOURNAL Vol. 10 No. 3 October 2007
Publisher : Balai Besar Pengujian Mineral dan Batubara tekMIRA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30556/imj.Vol10.No3.2007.609

Abstract

Coal water mixture (CWM) is coal-water slurry in which particles of coal with a certain particle size distribution are suspended in water. CWM is required to have the highest possible coal concentration and a moderate viscosity in order to make handling easy. The main purpose of this study is to obtain the effect of coal upgrading on the rheology of CWM in terms of finding the most suitable dispersing additive in producing CWM with highest coal concentration. Two kinds of coal, raw and upgraded coal, from three areas in Indonesia have been used. Three kinds dispersing additives, i.e. formalin conden- sation product of naphthalene sulfuric acid (NSF), polystyrene sulfonic acid (PSS) and poly (meth) acrylate (PMA) were tested to produce CWM with good flow characteristics. The rheology of CWM was prepared, measured by a stress control type rheometer (Rheometric Scientific Co. Ltd., SR-5) in steady shear mode at 25ºC. The apparent viscosity of upgraded coals showed a better slurry-ability of CWM as a function of coal concentration for every dispersing additive compared to the raw coal.
K/AR DATING OF BUKIT ASAM AND BUKIT KENDI INTRUSIONS RELATED TO AGE OF MATURITY AND INCREASING OF COAL QUALITY IN TANJUNG ENIM AREA, SOUTH-SUMATERA HARRY UTOYO UTOYO
Indonesian Mining Journal Vol 10 No 3 (2007): INDONESIAN MINING JOURNAL Vol. 10 No. 3 October 2007
Publisher : Balai Besar Pengujian Mineral dan Batubara tekMIRA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30556/imj.Vol10.No3.2007.610

Abstract

Coal bearing Muara Enim Formation is widely spread in Muara Enim, especially in Tanjung Enim District, South-Sumatera Province. Field observations display increasing maturity and quality towards Bukit Asam and Bukit Kendi intrusions. Potassium argons age analysis revealed that Bukit Asam is 0,9203 ± 0,26 million years in age and Bukit Kendi is 1,1472 ± 0,29 million years in age respectively, while Bukit Serilo displays negative age. These K/Ar ages result revealed that increasing maturity and quality of coal of the Bukit Asam and Bukit Kendi have taken place since 1,14 million years.
COASTAL CHARACTERISTICS OF IRON SAND DEPOSITS IN INDONESIA HANANTO KURNIO
Indonesian Mining Journal Vol 10 No 3 (2007): INDONESIAN MINING JOURNAL Vol. 10 No. 3 October 2007
Publisher : Balai Besar Pengujian Mineral dan Batubara tekMIRA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30556/imj.Vol10.No3.2007.611

Abstract

Coastal features of Indonesia are controlled by the geology and geomorphology of the hinterland and the bordering adjacent marine environments. Tectonic instability manifested as frequent earthquakes combined with volcanic eruptions and sea level changes also affect Indonesian coastline. Unstable air and heavy rainfall zone known as intertropical convergence zone (ITC) which migrates to the north and south of the equator together with orographic factor of mountain ranges in Sumatra, Java and Nusatenggara are also controlling coastal landforms. Large sediment quantities resulted from a com- bination of deeply weathered rock in steep elevated hinterlands and frequent heavy rainfall are trans- ported to the coast and built extensive deltas and broad coastal plains. Iron sands in Sumatra, Java, Bali and Nusatenggara Islands are largely derived from denudation of andesite and old andesite forma- tion enriched in magnetite and ilmenite minerals. In certain cases periodic eruptions of active volca- noes supply fluvial sand to maintain the prograding shoreline. Wave regime in Indonesian coastal waters resulted from strong swells of Indian Ocean in the south and Pacific Ocean in the northeast has much influence various coastal features. Coastal zones especially the southern parts of the Neogene Sunda Banda magmatic arc are the area of potential and producing iron sand deposits which extend from northern Sumatra to eastern Indonesia. Beach sediments enriched in magnetic minerals of such coastal zones are typically black or grey. The iron sand deposits have been mined either by state company or by local people. Small scale mining helps to improve the economy of the commu- nity. Application of regulations and good guidances of these artisanal minings will not destructive to the natural environments.
PHILLIPSITE MINERAL IN DEEP SEA SEDIMENT FROM SINGLE CORE IN ROO RISE, INDIAN OCEAN MIMIN K. ADISAPUTRA; HARTONO HARTONO
Indonesian Mining Journal Vol 10 No 3 (2007): INDONESIAN MINING JOURNAL Vol. 10 No. 3 October 2007
Publisher : Balai Besar Pengujian Mineral dan Batubara tekMIRA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30556/imj.Vol10.No3.2007.612

Abstract

During the MD III - IMAGES IV Expedition, one of the cores that has length around 30.30 m below sea floor (bsf) was obtained using gigantic piston corer from the depth of 3,884 m below sea level (bsl). This core (MD982156) is located in Roo Rise, Indian Ocean, south of East Jawa, outer part of Jawa Trench. The sediment consists of abundance planktonic foraminifera in the upper part while in the lower part, there is no planktonic one. The latter is mostly composed of phillipsite-rich sediment (± 40%) that is possibly derived from tephra. The base of the core between the depths of 30 – 30.30 m bsf is composed of clay sediment, consisting of minerals derived from zeolite group (phillipsite), gibbsite, and other cryptocrystalline masses. Phillipsite was deposited as an authigenic deep sea sediment, whereas gibbsite is usually deposited within bodies of water. Besides, there are also nanno- plankton accumulated in the crystal of phillipsite. This part has an age of Late Miocene or older. This fact is supported by the overlain layer containing planktonic foraminifera species Sphaeroidinellopsis seminulina of Late Miocene age (N17). The thickness and the lateral continuity of this layer are still unknown.

Page 16 of 28 | Total Record : 277

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