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Indonesian Mining Journal

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Published by PUSLITBANG Teknologi Mineral dan Batubara

ISSN : 08549931 EISSN : 25278797 DOI : -

Core Subject : Science, Social, Engineering,

Chemical Engineering, Chemistry & Bioengineering Earth & Planetary Sciences Energy Engineering Environmental Science

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 : -

Articles 264 Documents

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BIOSOLUBILIZATION OF PHOSPHATE ROCK BY Penicillium sp Sri Handayani; Suratman Suratman
Indonesian Mining Journal Vol 18, No 1 (2015): INDONESIAN MINING JOURNAL Vol. 18 No. 1 February 2015
Publisher : Puslitbang tekMIRA

Phosphorus is an essential element that regulates soil fertility. Its deficiency is replenished by chemical fertilizer made from phosphate rock. An environmentally friendly and economically alternative to chemical processing of phosphate rock is the use of phosphate solubilizing microorganisms. In this research, a potential phosphate solubilizing fungi were successfully isolated from the surface of Cijulang phosphate rock and identified as close relative of Penicillium sp. The phosphate biosolubilization capability of the fungus was tested and the influence of leaching parameters such as particle size of mineral, ore concentration (pulp density), and initial pH of medium was investigated using a shake flask study to characterize the solubilization of phosphorus by Penicillium sp. The x-ray diffraction data indicated the presence of hydroxyl apatite Ca5(PO4,CO3)3OH as the main source of phosphorus.The fungal strains of Penicillium sp produced oxalic and citric acids during fermentation of glucose which resulted in a drop pH of the growth medium. The results also indicated a potential relationship between the phosphorus biosolubilization and the production of organic acids by the fungus. In addition, particle size, ore concentration and initial pH were also shown to have significant effects on the solubilization of phosphorus from the phosphate rock. The optimal speed of attack was obtained for a surface area of substrate of .-200 mesh. A concentration of 5% solid gave the highest speed of P biosolubilization. The optimum range of initial pH was 6-7 and initial pH began to show an inhibiting effect at 4. The maximum percentage of soluble phosphorus released of 42.8% was attained using -200 mesh particle size, 5% pulp density and initial pH 6 after 16 days of process.

GEOLOGIC FACTORS CONTROLLING MINERAL CONTENT IN SELECTED TERTIARY COALS - SOUTHERN KALIMANTAN Binarko Santoso
Indonesian Mining Journal Vol 12, No 2 (2009): INDONESIAN MINING JOURNAL Vol. 12 No. 2 June 2009
Publisher : Puslitbang tekMIRA

Geologic aspects, particularly geologic history and depositional environment, have a main role in the distri- bution of mineral matter in association with maceral composition in coal. The Asem-Asem coals include Miocene and Eocene coals, which are associated with clay minerals, quartz, pyrite and carbonate. The average mean mineral content of the Miocene coals (3.9%) is lower than that of the Eocene coals (6.7%). This indicates that the lower content reflects the balance of the subsidence rate and the peat accumulation rate during the Miocene was absolutely different from those during the Eocene. Consequently, this influ- enced the mineral input to the respective peats. The lower mineral content of the Miocene coals is associated with the bright lithotypes or the vitrinite-rich coals. Otherwise, the higher one of the Eocene coals is associ- ated with dull lithotypes or the vitrinite-poor coals. Methods applied in this study include optical microscopy (reflected-white light and fluorescence mode), X- ray diffraction and scanning electron microscopy (SEM). Clay minerals dominated by kaolinite were deposited in a fresh water environment during peat formation. Most of the minerals are syngenetic in origin. However, some of them are considered to be epigenetic (these clays are in fissures). Quartz is mostly syngenetic, although epigenetic quartz is present. Pyrite takes place as grains and a replacement mineral in organic matter. Calcite is mostly epigenetic occurring in fractures and fissures.

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 : Puslitbang tekMIRA

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.

STUDY OF COMPRESSIONAL AND SHEAR WAVE VELOCITY TESTS IN THE LABORATORY AND FIELD APPLIED TO SEDIMENTARY ROCKS OF RANTAU NANGKA DISTRICT, SOUTH KALIMANTAN Zulfahmi Zulfahmi
Indonesian Mining Journal Vol 16, No 2 (2013): INDONESIAN MINING JOURNAL Vol. 16 No. 2 June 2013
Publisher : Puslitbang tekMIRA

Compressional (Vp) and shear (Vs) wave velocities within rocks are often investigated by testing in the laboratory because it is easier and cheaper. However, it is more confidence with investigation results derived from the field due to the actual situation and conditions. In the laboratory, the wave velocities are commonly measured using ultrasonic pulse velocities test. But in the field, the velocities are commonly measured directly by several methods such as cross-hole seismic, down-hole seismic, suspension logging, seismic reflection, seismic refraction and spectral analysis of the surface wave. In the present study of field insitu tests, it has used down-hole seismic method. The field insitu test is more expensive than the laboratory test. Hence, this study would evaluate and compare data derived from both of laboratory and field insitu tests. Based on the measurements correlation, it is found that regression equation for each parameter are ... for compressional wave velocities, ... for shear wave velocities, xxxxx for shear modulus, ... for ... modulus of elasticity, for bulk modulus and ... for Lame constants. This equation can be applied to correct the laboratory test data in order to get close results between the laboratory and field insitu tests.

THE USE OF 1-METHYL NAPHTHALENE AS COAL ASH REMOVAL SOLVENT Datin Fatia Umar; Gandhi Kurnia Hudaya
Indonesian Mining Journal Vol 19, No 2 (2016): INDONESIAN MINING JOURNAL VOL. 19 NO. 2 June 2016
Publisher : Puslitbang tekMIRA

Solvent extraction method is one of the methods to reduce ash content in coal to improve the energy efficiency and reduce negative environmental impacts. The use of 1-methyl naphthalene (1-MN) as a solvent in the weight ratio of coal to solvent of 1: 3, 1: 6 and 1: 9 using three coal samples obtained from a coal washing plant, namely ROM (run of mine), DC (dirty coal) and RC (reject coal) was performed. Results show that the ash content of the extracted coals no or significantly low amount (<0.3%) ash contents. The highest extraction yield was obtained at 15.38 % (daf) at DC coal sample and coal to solvent ratio of 1:9, while the lowest at 3.09 % (daf) at ROM coal sample and coal to solvent ratio of 1:3. In addition, the extraction process with a solution of 1-MN also able to reduce moisture content of the coals, as a result the calorific value of the coals were significantly increased.

ANALYSIS ON TERMS OF TRADE OF INDONESIA’S NICKEL Harta Haryadi; Bambang Yunianto
Indonesian Mining Journal Vol 19, No 1 (2016): INDONESIAN MINING JOURNAL Vol. 19 No. 1 February 2016
Publisher : Puslitbang tekMIRA

The import-export trade of nickel Indonesia until 2013 was always in a less prestigous position. It is due to the entire production of nickel is exported in raw materials, while nickel is continued to be imported to meet the industrial needs of stainless steel, nickel alloys, batteries and nickel metal alloys in the country. This study aims to analyze the advantages and disadvantages of export and import of nickel with a terms of trade analysis in net barter, which measures the ratio of the nickel export price with imports price, and gross barter measures the ratio of the nickel export volume to the import volume. Net barter of the analysis results shows that in 2007, the nickel export price was only 0.0121 times than the nickel import price, while gross barter indicates that the export volume was 11044.87 times compared to the import volume. Volume and value of the exports are in nickel ore), while imports in nickel oxide sinters, product of nickel metallurgy, nickel alloys, nickel waste and scrap and nickel powders and flakes. The analysis overview of nickel gives an indication that international trade (export-import) of nickel has not provided an optimal impact on the national and regional economy.

KINETICS ANALYSIS FOR ALUMINUM DISSOLUTION OF WEST KALIMANTAN BAUXITE THROUGH DIGESTION PROCESS Des Amalia; M. Zaki Mubarok; Hisaini Husaini
Indonesian Mining Journal Vol 17, No 2 (2014): INDONESIAN MINING JOURNAL Vol. 17 No. 2 JUNE 2014
Publisher : Puslitbang tekMIRA

Kinetics model was developed for aluminum dissolution of West Kalimantan bauxite based on shrinking core model. A series of digestion tests was carried out to study aluminum dissolution from the ore sample with particles size distribution of 100% passing 60 mesh in 129 gpL of NaOH. The digestion tests were conducted at 140; 150 and 160°C under stirring speed of 500 rpm. The experimental result shows that after a certain period of diges- tion time, thus aluminum dissolution was fluctuated due to the formation of DSP as a result of the reaction of sodium aluminate solution with reactive silica in the ore. Aluminum dissolution data were analyzed and treated with Matlab software to predict time required for complete dissolution (t). By using the obtained t, hence fittings experimental data using 3 different rate-determining steps of kinetics models (i.e. interface reaction, film diffusion and diffusion through solid product layer) and dummy data were performed. Prediction of the rate-determining step of aluminum dissolution was then made by evaluating the value of square correlation coefficient (R2) from the regression equation of the models and then obtained the activation energy. The kinetics study which considers aluminum precipitation during digestion reveals that alumina dissolution mechanism is altered from interface chemical reaction with energy activation (Ea) of 29.57 kcal/mole to difussion through reaction product (ash) layer (Ea=2.77 kcal/mole).

APPLICATION OF MULTI-ARRAY ELECTRICAL RESISTIVITY TOMOGRAPHY IN PT. BUKIT BAIDURI ENERGI COAL MINING-EAST KALIMANTAN Piter Lepong; Supriyanto Supriyanto; Sri Wahyuningsih; Hardiyanto Hardiyanto
Indonesian Mining Journal Vol 21, No 1 (2018): INDONESIAN MINING JOURNAL, Vol. 21 No. 1, April 2018
Publisher : Puslitbang tekMIRA

Multi-array Electrical Resistivity Tomography survey was conducted in coal mining concession of PT. Bukit Baiduri Energi at the Marandai pit, Loa Janan District, Kutai Kartanegara-East Kalimantan. Data acquisition has been done using the MAE-X612 unit with 48 electrodes and 5 meters interval and the maximum length of the survey was 235 meters. The aim of the survey is to analyze resistivity images from three different electrodes configurations for interpreting coal seams and other lithologies. We deployed three configurations, including Wenner-Schlumberger, Dipole-Dipole, and Pole-Dipole in one traverse. The resistivity images analyses were constrained using geological and geophysical logging. The result shows that the Wenner-Schlumberger array is the reliable result comparing to the dipole-dipole and pole-dipole arrays. This technique will apply for further assessment to provide the reliable result in this coal mining concession. Electrical Resistivity Tomography offers rapid mapping for shallow mine working up to 45-meter depth. This method can be applied to one or two hour’s measurements with 48 electrodes with maximum 5-meter electrodes interval. This method offers the possible saving of drilling cost by using resistivity profile for coal seam correlation instead of conducting more drilling.

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 : Puslitbang tekMIRA

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.

EFFECT OF COMBUSTIBLE CONTENT IN COAL ASH REFUSE ON THE EFFICIENCY OF THERMAL OIL HEATER SYSTEM HAIFA WAHYU
Indonesian Mining Journal Vol 15, No 3 (2012): INDONESIAN MINING JOURNAL Vol. 15 No. 3 October 2012
Publisher : Puslitbang tekMIRA

This paper provides an analysis on the effect of combustible content in coal ash refuse the efficiency towards combustion and heat thermal oil heater system in a coal furnace that had been studied. The study investigated the discrepancy of the actual performance of the heater compared to that as stated in the design specification. The study assumed that coal type and operational problem were the cause of deviation. Both affect combustion efficiency and the amount of reactive materials within coal ash refuse. Combustible content within the coal ash refuse was the used as the source data. Using indirect method, the amount of losses can be determined from the amount of combustibles in the coal ash refuse. The work involved measuring the temperature of oil and flue gas, analyzing the ash content and calculating the losses based on two sets of operational data. System efficiency and heat exchanger rating were calculated by reducing the amount of total losses from the full design capacity. If the reactive composition within the coal ash in combustible content, the amount of coal consumption is higher in order to attain the heat desired capacity for heating. Such a contition is caused by decreasing the energy capacity and reducing the furnace effectiveness

Page 14 of 27 | Total Record : 264

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Contact Name
Bachtiar Efendi

Contact Email
bachtaireaje@gmail.com

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Journal Mail Official
umar.antana@esdm.go.id

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Location
Kota bandung,

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