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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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MACERAL AND MINERAL ANALYSIS OF LEBAK COALS REGARDING THEIR UTILISATION BINARKO SANTOSO; BUKIN DAULAY
Indonesian Mining Journal Vol 10 No 2 (2007): INDONESIAN MINING JOURNAL Vol. 10 No. 2 June 2007
Publisher : Balai Besar Pengujian Mineral dan Batubara tekMIRA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30556/imj.Vol10.No2.2007.617

Abstract

Type and rank variations of Lebak coals were derived from twenty-eight samples of Palaeogene coalfield (Bayah, Cimandiri and Cihideung) and Neogene coalfields (Bojongmanik) using petrographic analy- ses. The Lebak coals are dominated by vitrinite, liptinite and minor inertinite and mineral matter as well. The coal type, in terms of maceral and mineral compositions, reflects climatic influences and differences in peat conditions. Higher vitrinite reflectance of Palaeogene coals, compared to Neogene ones, is a result of higher regional coalification level in the basin, associated with greater cover and local effect of igneous intrusion. The Palaeogene coals have better quality than the Neogenes and is also supported by higher specific energy. The coals that are vitrinite-rich, liptinite and inertinite-poor are suitable for direct combustion.
PRODUCTION OF SYNTHESIS GAS FROM INDONESIAN LOW RANK COALS USING FLUIDIZED BED GASIFICATION REACTOR SLAMET SUPRAPTO; NURHADI NURHADI
Indonesian Mining Journal Vol 10 No 2 (2007): INDONESIAN MINING JOURNAL Vol. 10 No. 2 June 2007
Publisher : Balai Besar Pengujian Mineral dan Batubara tekMIRA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30556/imj.Vol10.No2.2007.618

Abstract

In relation to the objective of securing energy and raw material supplies for industries and increasing of low rank coal utilization; research on the production of synthesis gas from Indonesian coal has been carried out. Low rank coal samples and a fluidized bed reactor which was equipped with gas purification system have been used. The coal samples used were Adaro coal (sub bituminous), Mulia and Gunung Bayan (lignitic coals). Gasifying agent was also varied and consisted of oxygen, oxygen/ steam mixture and steam. Stoichiometric ratio of oxygen/carbon was kept at one half and oxygen/ steam ratio was one. The gasification temperature was kept constant at 900ºC. The composition of gas products were analyzed using a gas chromatograph with molsieve and porapak columns. The results showed that there was a good correlation between gasifying agent, coal used, quality and quantity of synthesis gas.
INDONESIAN LOW RANK COAL RESOURCES TO WHICH UBC TECHNOLOGY IS COMMERCIALLY APPLICABLE BUKIN DAULAY; BINARKO SANTOSO; IKIN SODIKIN
Indonesian Mining Journal Vol 10 No 2 (2007): INDONESIAN MINING JOURNAL Vol. 10 No. 2 June 2007
Publisher : Balai Besar Pengujian Mineral dan Batubara tekMIRA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30556/imj.Vol10.No2.2007.619

Abstract

Low rank coal (LRC) that constitutes more than 65% of the national coal resources has to be utilized optimally in order to achieve the security of domestic energy supply and an optimum mix of primary energy consumption by the year 2025. The LRC can be upgraded to higher rank coal, both for export and domestic use, particularly for existing industries. Upgraded Brown Coal (UBC) process is one of the best upgrading technologies that can be implemented. Moreover, the low cost production of LRC and the availability of infrastructures would be the more attractive for UBC commercialization. Based on the coal quality specification recommended in this paper, the total moisture of the LRC varies from25.33 to 57.89% (typical 35 - 40%, as received/ar) and its calorific value ranges from 2,504 to 4,900 kcal/kg (typical 3,000 - 4,000 kcal/kg, ar). The ash content of the recommended LRC is less than 10% (typical <5%, dry basis/db) and the sulphur content is typical <0.5% (db). The LRC located in East and South Kalimantan is more attractive for UBC commercialization compared to LRC located in South Sumatera. Most of the LRC in South Sumatera is located far inland that makes the transporta- tion cost for UBC equipment and product become expensive.
APPLICATION OF SIMPLE DISPLACEMENT MONITORING SYSTEM FOR ROCK/SOIL MOVEMENT AT BINUNGAN MINE OPERATION OF PT. BERAU COAL ZULFAHMI ZULFAHMI
Indonesian Mining Journal Vol 10 No 2 (2007): INDONESIAN MINING JOURNAL Vol. 10 No. 2 June 2007
Publisher : Balai Besar Pengujian Mineral dan Batubara tekMIRA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30556/imj.Vol10.No2.2007.620

Abstract

This monitoring result illustrates the real slope stability and could be used as datat for back analysis to obtain the real shear strength (c and ö).Study of monitoring system application to detect soil/rock movement at mine slope was conducted bya team from tekMIRA in 2006. The location of trial run was Binungan Mine Operation, PT. Berau Coal. The team used combinations of simple, accurate and relatively low cost monitoring equipment consists of radio modem, data logger and potential trans- ducer. Potential transducers were connected to the observation points using a wire line. When the movement occurs along the mine slope, the wire line will cause a difference potentiometer voltage. The results show a good value of linearity with value of r-square between 0.964 and 0.98
OVERBURDEN TREATMENT TECHNOLOGY IN ACID MINE DRAINAGE PREVENTION ALI RAHMAT KURNIAWAN; Retno damayanti
Indonesian Mining Journal Vol 10 No 2 (2007): INDONESIAN MINING JOURNAL Vol. 10 No. 2 June 2007
Publisher : Balai Besar Pengujian Mineral dan Batubara tekMIRA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30556/imj.Vol10.No2.2007.621

Abstract

The prevention and control of acid drainage is a major issue for mine operators at sites where sulfide minerals occur. On going risk assessment of acid drainage potential and sulfidic waste management during planning, development, operation and closure of mining developments will result in substantial environmental and economic benefits. Overburden treatment technology must be identified and imple- mented in order to minimize the production of acid mine drainage (AMD). There are many treatment technologies for AMD prevention at surface mining such as alkaline addition and special handling. Overburden analysis (OBA) refers to determination of the acidity or alkalinity producing potential. The addition of alkaline material to surface mine backfill can be an effective method of compensating for overburden and reduce the potential for acid mine drainage. Special handling methods fall into four categories: blending, encapsulation, submergence and alkaline redistribution. Special handling is most effective in conjunction with other best management practices such as alkaline addition. Moni- toring during and after mining is necessary to evaluate special handling techniques.
NUMERICAL MODELLING AND SLOPE STABILITY ANALYSIS FOR OPTIMIZING OPEN PIT COAL MINE AT BINUANG SOUTH KALIMANTAN I GDE SURATHA
Indonesian Mining Journal Vol 10 No 1 (2007): INDONESIAN MINING JOURNAL Vol. 10 No. 1 February 2007
Publisher : Balai Besar Pengujian Mineral dan Batubara tekMIRA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30556/imj.Vol10.No1.2007.626

Abstract

The objective of the numerical modelling study and slope stability analysis using the finite element method (FEM) is to determine the optimum pit slope design. Many simulations were carried out by varying the overall pit slopes and the depth of the open pit coal mines. The pit slope with a safe condition in stability and a reasonable waste-coal ratio was chosen as the optimum pit slope design. According to the result of this study, some revisions on the existing pit slope design are needed. It is also recommended to develop a monitoring system, especially for instability monitoring and groundwa- ter level fluctuations behind the slope surfaces that could threaten the slope stability.
STUDY ON UTILIZING FLY ASH FOR CASTABLE REFRACTORY I GUSTI NGURAH ARDHA; MUCHTAR AZIZ
Indonesian Mining Journal Vol 10 No 1 (2007): INDONESIAN MINING JOURNAL Vol. 10 No. 1 February 2007
Publisher : Balai Besar Pengujian Mineral dan Batubara tekMIRA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30556/imj.Vol10.No1.2007.627

Abstract

Fly ash could be utilized as alumina and silica sources material. It could be treated by the following processes of demagnetisation, sinterization, grinding, mixing with crushed bricks as well as fired cement to create acid based on castable refractory. Sinterization changes alumina and silica signifi- cantly into mullite. The standard measurement of pyrometric cone equivalent (PCE) is used to under- stand the temperature resistance of the studied castable refractory based fly ash. The temperature resistance seems to increase after contacting with high temperature at longer time or repeatedly until reaching its Si-Al stabilization phase.
COAL LIQUEFACTION IN INDONESIA: CURRENT STATUS AND FUTURE PROGRAMME NINING S. NINGRUM; BUKIN DAULAY
Indonesian Mining Journal Vol 10 No 1 (2007): INDONESIAN MINING JOURNAL Vol. 10 No. 1 February 2007
Publisher : Balai Besar Pengujian Mineral dan Batubara tekMIRA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30556/imj.Vol10.No1.2007.628

Abstract

The Presidential Decree No. 5/2006 and Presidential Instruction No. 2/2006 about Supply and Exploi- tation of Liquefied Coal as Other Fuel has instructed the interrelated department, including the Ministry of Energy and Mineral Resources, to bring about the development of coal liquefaction plant in Indone- sia, and make use of its product - in the form of oil fuel. To implement the instruction, the Coordinating Ministry for Economic Affairs issued Decision Letter, No. KEP-11/M.EKON/02/2006 about Coordina- tor of Team Action Programmed Supply and Use of Alternative Energy and KEP-01/D.III.M.EKON/02/ 2006 about Technical Coordinator Action Programme Supply and Use of Alternative Energy. Some activities that have been done by the coal liquefaction team in 2006 were the socialization of coal liquefaction to introduce the coal liquefaction technology to the investors. It is expected that the investors will be interested in investing their financial capital in the coal liquefaction.
THE EFFECT OF DISPERSING AND STABILIZING ADDITIVE ON THE STABILITY OF UPGRADED COAL WATER MIXTURE DATIN F. UMAR; BUKIN DAULAY; HIROMOTO USUI; YOSHIYUKI KOMODA
Indonesian Mining Journal Vol 10 No 1 (2007): INDONESIAN MINING JOURNAL Vol. 10 No. 1 February 2007
Publisher : Balai Besar Pengujian Mineral dan Batubara tekMIRA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30556/imj.Vol10.No1.2007.629

Abstract

The upgraded brown coal water mixture (UBCWM) stability with several dispersing and stabilizing additives was studied based on coal sedimentation time history. UBCWM was filled up in a settling column; which has four holes in the upper, upper middle, bottom middle and middle side to take samples. Results indicate that the addition of Naphthalene sulfonate formaldehyde condensate (NSF) as dispersant together with S-194 some kinds of bio polysacharide with long branches produced by Dainippon Pharmaceutical Co. Ltd. as stabilizer, produces UBCWM with the best stability compare with that by using polystyrene sulfonate (PSS) and polymethacrylate (PMA) together with carboxyl methyl cellulose (CMC) and S-60 also some kinds of bio polysacharide, but without branches pro- duced by Dainippon Pharmaceutical Co. Ltd . Even the addition of S-194 results UBCWM with good stability, from the economical point of view, the addition of S-194 is a problem. The price of S-194 is expensive, whereas CMC is abundant and cheap. Therefore, the use of CMC as stabilizing additive was also effective in preparing stable UBCWM according to the stability of the UBCWM by using S- 194 and CMC is not significantly different.
ASSESSMENT OF INDIGENOUS MICROORGANISM FOR NATURAL ATTENUATION OF ABANDONED MINE SITE SRI HANDAYANI
Indonesian Mining Journal Vol 10 No 1 (2007): INDONESIAN MINING JOURNAL Vol. 10 No. 1 February 2007
Publisher : Balai Besar Pengujian Mineral dan Batubara tekMIRA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30556/imj.Vol10.No1.2007.630

Abstract

Soil samples taken from an abandoned gold mine site in East Kalimantan exhibited high concentra- tion of manganese (9,830-13,190 mg/L), iron (340-8,060 mg/L) and arsenic (160-510 mg/L). However, the indigenous microbial population was found to be present at high level (> 107 CFU/g), indicated that the site matrix did not appear to be inhibitory and relatively favorable to microbial growth. Furthermore, laboratory microcosm studies showed that the indigenous microorganisms possessed a considerable bioremoval potential of contaminated metal at the site. Those results suggested that natural attenua- tion of metal bioremoval would occur under present site condition.

Page 17 of 28 | Total Record : 277

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