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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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ANALYSIS OF THE VALUE – ADDED FOR TAYAN BAUXITE ORE AND CHEMICAL GRADE ALUMINA Harta Haryadi
Indonesian Mining Journal Vol 19 No 3 (2016): INDONESIAN MINING JOURNAL VOL. 19 NO. 3, October 2016
Publisher : Balai Besar Pengujian Mineral dan Batubara tekMIRA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30556/imj.Vol19.No3.2016.631

Abstract

Research conducted at PT. ANTAM and PT. ICA (Indonesia Chemical Alumina) Tayan, West Kalimantan was aimed to compare the amount of company value-added from selling the bauxite ore as a raw material and the chemical grade alumina as a processed goods. This research showed that company value added from selling 850.000 tons raw meterial US $ 8.92 million it consisted of salary and wages of US $ 692.42 thousand, royalties, CSR and insurance US $ 473.87 thousand, surveyor services US $ 150.00 thousand, other services $ 45.00 thousand, corporate income tax of US $ 1.64 million, Bank interest US $ 191.77 thousand. The company profits obtained the US $ 5, 73 million was. Of the US$ 8.92 million added value and 850.000 bauxite selling, the increase of total added value was US$ 10.49 per ton. Selling the chemical grade alumina up to 300,000 tons or equivalent to 850,000 tons provided the value-added to the US $ 57.24 million that consisted of an increase in revenue salaries and wages to US$ 3.85 million. 50.75 billion, royalties, CSR and insurance of US $ 2.49 million, surveyor services and other services US $ 16.50 million, corporate income tax $ 10.39 million, Bank interest US $ 1.21 million and corporate profits to the US $ 22.00 million. The overall value added from selling the processed goods was US$ 190.44 per ton. It is indicated that selling the chemical grade alumina provides a greater profit than that of selling the raw material.
CHEMICAL AND PHYSICAL PROPERTIES OF UPGRADED BROWN COAL DATIN F. UMAR; HIROMOTO USUI; BUKIN DAULAY; IWAN RIJWAN; IKIN SODIKIN
Indonesian Mining Journal Vol 9 No 3 (2006): INDONESIAN MINING JOURNAL Vol. 09 No. 3 October 2006
Publisher : Balai Besar Pengujian Mineral dan Batubara tekMIRA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30556/imj.Vol9.No3.2006.636

Abstract

Results of proximate analyses indicate that inherent moisture of the upgraded coals decrease signifi- cantly compared to that of the raw coals. Hence, the calorific value of the upgraded coals increases. The ash content of the upgraded coals did not change obviously due to the UBC process which was conducted at low temperature. However, the volatile matter content increase slightly due to the residue plugs over coal pores to prevent re-absorb of moisture. From ultimate analyses, carbon content of the upgraded coals increases, whereas the hydrogen and oxygen contents decrease. The UBC process hardly effects to the sulfur and nitrogen contents. The equilibrium moisture of the upgraded coals was determined by using ASTM Standard method, most of them were less than 9%. The functional group of C-H and C=O of the upgraded coals were slightly less than that of the raw coals. The aromaticity of coal, all of the upgraded coals was increase. The petrography of both the raw and the upgraded coals indicates that the mean vitrinite reflectance was slightly higher in the upgraded coal compared to that of the raw coal. There was no significant quantity and textural differences of maceral in both coals. The specific surface area of the upgraded coals was lower than that of the raw coals due to the plugging of pore structure and shrinkage by residual oil addition. The briquettability of Upgraded coal briquette according to drop shatter test and compressive strength indicates good characteristics of briquette.
COALIFICATION TREND IN SOUTH SUMATERA BASIN BINARKO SANTOSO; BUKIN DAULAY
Indonesian Mining Journal Vol 9 No 3 (2006): INDONESIAN MINING JOURNAL Vol. 09 No. 3 October 2006
Publisher : Balai Besar Pengujian Mineral dan Batubara tekMIRA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30556/imj.Vol9.No3.2006.637

Abstract

Similarities and differences in rank characteristics in the Bukit Asam coals within the South Sumatera Basin reflect their geological setting, particularly influence of the intrusion of andesite bodies and stratigraphic aspect. Rank variation was determined by vitrinite reflectance measurements of one hundred and thirty-four (134) coal samples. The higher vitrinite reflectance of the coals is a result of higher regional coalification level in the basin associated with the local and variable effects of igneous intrusions, as well as the greater cover/overburden. Philosophically, the higher the temperature, the more profound the alteration occurs; and the thicker the overburden, the more profound the rank occurs as well. The thermally affected coals have vitrinite reflectances between 0.69% (high volatile bituminous) and 2.60% (anthracite), whereas those of not affected are between 0.30% (brown coal) and 0.53% (sub-bituminous) according to the Australian classification.
BENEFITS OF COAL STOCKPILE AT PALIMANAN TO ITS SURROUNDING COMMUNITY ENDANG SURYATI
Indonesian Mining Journal Vol 9 No 3 (2006): INDONESIAN MINING JOURNAL Vol. 09 No. 3 October 2006
Publisher : Balai Besar Pengujian Mineral dan Batubara tekMIRA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30556/imj.Vol9.No3.2006.638

Abstract

One of the positive impacts of coal stockpiles in Palimanan is the benefits for surrounding communi- ties. Poling of stockpile developments to people in West Palimanan shows that 81.20 % people agree to have stock pile, 8.57 % disagree and the rest is abstain. Disagreement occurs as the people are afraid with dust pollution from coal stockpiles and transportation.
MAGNETIZING ROASTING OF IRON LATERITE ORE BY SUB-BITUMINOUS COAL AS REDUCTANT NURYADI SALEH; PRAMUSANTO PRAMUSANTO
Indonesian Mining Journal Vol 9 No 3 (2006): INDONESIAN MINING JOURNAL Vol. 09 No. 3 October 2006
Publisher : Balai Besar Pengujian Mineral dan Batubara tekMIRA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30556/imj.Vol9.No3.2006.639

Abstract

The overburden of Pomalaa’s laterite ore is characterized by its high content of iron with average Fe content of 41.8 % and can be classified as iron cap deposit. As a significant iron ore resource to be used as raw material for iron and steel industry, upgrading of laterite ore is necessary to meet the requirement for iron making. The ore was treated by magnetized roasting technique followed by mag- netic separation to produce high iron content of magnetic concentrate. The ore were dominated by limonite iron minerals and has low magnetic property. However, roasting reduction treatment increased the magnetic properties of the ore due to transformation of magnetite.
PREDICTION OF MINE DRAINAGE QUALITY BY KINETIC TESTS LASMARIA SIBARANI; Retno damayanti
Indonesian Mining Journal Vol 9 No 3 (2006): INDONESIAN MINING JOURNAL Vol. 09 No. 3 October 2006
Publisher : Balai Besar Pengujian Mineral dan Batubara tekMIRA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30556/imj.Vol9.No3.2006.640

Abstract

Kinetic test is one of the methods to predict acid mine drainage. The test shows the acceleration of natural oxidation rate over those observed in the field. This may have the advantage of condensing time, and providing earlier insight into the potential for acid generation. Generally, kinetic test evalu- ates the changes in pH, sulfate, acidity and host of potential metals. However, the test also has high degree uncertainty. To minimize the uncertainty it needs to calibrate and validate the model of kinetic test by comparing prediction model with actual field sampling results. As field data availability for validation is limited, it is strongly suggested that researcher should make a continuous research from the prediction and the actual sampling using many methods.
A REVIEW OF SYN-GAS POLYGENERATION AS ONE OF SOLUTIONS TO SOLVE NATIONAL ENERGY CRISIS NURHADI NURHADI; NINING S. NINGRUM
Indonesian Mining Journal Vol 9 No 2 (2006): INDONESIAN MINING JOURNAL Vol. 09 No. 2 June 2006
Publisher : Balai Besar Pengujian Mineral dan Batubara tekMIRA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30556/imj.Vol9.No2.2006.645

Abstract

In the future, Indonesian crisis energy can be overcome by the use of coal as oil substitute. Substi- tuting oil by coal is still a problem due to unfamiliar using coal by Indonesian, inappropriate technology selection and environmental pollution. The use of coal-based syn-gas as various energy resources and chemical material can be conducted in an integrated system called syn-gas polygeneration. Syn- gas polygeneration is efficient and environmental friendly. Its process can be conducted gradually. Yet government policy is needed to start applying syn-gas polygeneration from coal gasification.
REPLACING FUEL OIL BURNER IN A ZINC BATH KETTLE FOR GALVANIZATION PROCESS BY COAL CYCLONE ONE SUMARYONO SUMARYONO
Indonesian Mining Journal Vol 9 No 2 (2006): INDONESIAN MINING JOURNAL Vol. 09 No. 2 June 2006
Publisher : Balai Besar Pengujian Mineral dan Batubara tekMIRA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30556/imj.Vol9.No2.2006.646

Abstract

Most galvanizing industries use fuel oil to maintain a zinc bath temperature within the 440 – 455°C range. The oil burner is used in a heating chamber and the flue gas is then passed into the heating space under a zinc bath kettle at a temperature of 600°C. In this works one of the oil burner would be replaced by a coal burner. The kettle dimension is 12 x 1.5 x 1.8 m for its inner length, width and depth respectively. The heating space under the kettle is divided into two sections, each section is heated by a single oil burner of 50 - 80 litres/hour burning capacity. As there is no access into the heating space to remove the accumulated ash, the employed coal combustion technique should not transfer the ash into this chamber. For this purpose a vertical cyclone coal burner is used in a section with combustion capacity of 100 - 200 kg coal/hour. To minimize ash accumulation, a cyclone dust sepa- rator is connected after the cyclone burner, thus a cleaner flue gas enters the heating chamber. The coal used is a low ash sub-bituminous type of 5,500 kcal/kg at with particle sizes less than 30 mesh. Observation of temperature fluctuation in oil heated and coal heated sections during galvanization process showed that the fluctuation in both sections are in balance, indicating that the coal heating matches fuel oil heating in this system. The fuel used are 124 kg/hour for coal and 60 l/hour for fuel oil. To maintain zinc bath temperature around 430 – 455°C within 7 days galvanizing time operation it is found that fuel consumption is 20,300 kg of coal in the coal heated section and 10,080 l fuel oil in the oil heated section. It means that 1 l fuel oil is equivalent to 2 kg of coal or coal efficiency is 18.2% lower than the oil one in this system. The ash produced by the combustion of coal which trapped by both cyclones is 80% which is accumulated in the burner and 20% in the cyclone dust separator. The energy efficiency of coal is lower than that of the fuel oil since the use of fuel oil is directly burned within heating chamber, otherwise the coal is combusted in a cyclone burner and the flue gas enters the heating chamber after a longer journey through a cyclone dust separator.
GEOLOGICAL INFLUENCE ON QUALITY OF SELECTED TERTIARY BARITO COAL BINARKO SANTOSO; BUKIN DAULAY
Indonesian Mining Journal Vol 9 No 2 (2006): INDONESIAN MINING JOURNAL Vol. 09 No. 2 June 2006
Publisher : Balai Besar Pengujian Mineral dan Batubara tekMIRA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30556/imj.Vol9.No2.2006.647

Abstract

Type and rank variation within Tertiary Barito coals of Tanjung Formation were analyzed by petro- graphic examination of ten coal samples. Vitrinite, common liptinite and rare inertinite and mi-neral matter dominate all the coals. Vitrinite macerals are dominated by detrovitrinite and telovitrinite. Resinite, cutinite and sporinite are the dominant liptinite macerals in the coals. Inertinite macerals in the coals comprise semifusinite, sclerotinite and inertodetrinite. Mineral matter consists mainly of clay and pyrite. Liptinite and inertinite contents within coals are systematically related to vitrinite content. The liptinite and inertinite contents decrease with increase of vitrinite content. The liptinite content is not related to the inertinite content. Vitrinite reflectance of Palaeogene coals ranges from 0.53% to 0.64% or sub-bituminous to high-volatile bituminous ranks, respectively, as classified by the Australian standards, and of the Neogene ones varies between 0.30% and 0.47%, classified as brown coal and sub-bituminous ranks, respectively. The slight change in vitrinite reflectance from the top to the base of the sequence is due to the thicker cover/overburden on the high rank coals. Similarities and differ- ences in the type and rank of the coals reflect their geological setting.
ANALYSIS OF BLAST VIBRATION IMPACT AT PARAMBAHAN COAL MINE, WEST SUMATERA USING SQUARE ROOT SCALED DISTANCE METHOD AGUS NUGROHO; WIROTO WIMBO PRIHONO; TATANG WAHYUDI
Indonesian Mining Journal Vol 9 No 2 (2006): INDONESIAN MINING JOURNAL Vol. 09 No. 2 June 2006
Publisher : Balai Besar Pengujian Mineral dan Batubara tekMIRA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30556/imj.Vol9.No2.2006.648

Abstract

Blasting which was conducted at Parambahan produced a series of blast vibrations that might be harmful to human safety and surroundings. Therefore, the vibrations need to be evaluated whether it was over permitted the threshold for human safety or not. One of analysis methods for this purpose is square root scaled distance. The principle of the proposed method is to assess blast vibration impact on the environment for the cases when the blasting for opening mine had been performed previously. Analysis results shows that blast vibrations at Parambahan is below the allowed threshold of blast vibration for environment. Using measurement distance from blast source of 20 to 2,000 m, the lowest measured vibration is 0.18 mm/s and the highest one is 21.0 mm/s. Those mean that blast-generated vibrations at Parambahan are still safe for human and surrounding environment.

Page 18 of 28 | Total Record : 277

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