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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 263 Documents
 1   2   3   4   5 
PETROGRAPHIC CHARACTERISTICS OF SELECTED TERTIARY COALS FROM WESTERN INDONESIA ACCORDING TO THEIR GEOLOGICAL ASPECTS Binarko Santoso
Indonesian Mining Journal Vol 20 No 1 (2017): INDONESIAN MINING JOURNAL VOL. 20 NO. 1 April 2017
Publisher : Balai Besar Pengujian Mineral dan Batubara tekMIRA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30556/imj.Vol20.No1.2017.178

Abstract

Selected Tertiary coals from the western part of Indonesia (Sumatera, Kalimantan and Java) indicate similarities and differences in type and rank characteristics. These coals reflect their geological setting, particularly for intrusive and stratigraphic aspects. Type and rank of the coals were assessed by petrographic examination. The coals are mainly dominated by vitrinite, common liptinite and rare inertinite and mineral matter. Vitrinite macerals are dominated 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 type differences largely reflect climatic influence and differences in peat conditions. In spite of short geological history, the coals exhibit variable vitrinite reflectances. The high vitrinite reflectance of the coals is a result of higher regional coalification levels in the basins associated with greater cover and effects of igneous intrusions.
EXTRACTING SILVER FROM ANODE SLIME AFTER LEAD AND GOLD SEPARATIONS Isyatun Rodliyah; Siti Rochani
Indonesian Mining Journal Vol 20 No 1 (2017): INDONESIAN MINING JOURNAL VOL. 20 NO. 1 April 2017
Publisher : Balai Besar Pengujian Mineral dan Batubara tekMIRA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30556/imj.Vol20.No1.2017.180

Abstract

Anode slime, a byproduct from the process of copper electrorefining into the copper cathode, contains several valuable elements that can be extracted after Cu and Pb separations. Another alternative route for extracting the precious metals is still needed in terms of gaining more economical route. This research aims to seek the new route to extract the precious metals, especially silver from anode slime. In these experiments, the anode slime was obtained from PT Smelting Gresik. The lead was separated to produce the residue which was then chlorinated to extract the gold. Later the residue was used for extracting the silver by dissolving it in ammonium hydroxide solution with varying time dissolutions and concentrations and later dissolving in hydrochloric acid to form silver chloride which was reduced to metallic silver. These experiments had two trials. The first one related to directly using residual chlorination after gold separation and the second one employed the same residual chlorination but processed through de-chlorination by adding sodium carbonate. The result showed that the highest silver recovery of 53.56% related to 5 M ammonium hydroxide concentration, the temperature of 30°C, dissolution time of 60 minutes. Recovery of 53.78% was achieved at 7 M ammonium hydroxide, the temperature of 30°C, dissolution time of 60 minutes. The feed of those experiments came from direct residual chlorination, while chlorination residue that underwent de-chlorination produced silver recovery of 94.95% with leaching conditions of 5 M ammonium hydroxide, the heating temperature of 30°C and leaching time of 60 minutes. The latest recovery was relatively high resulted in the process could be scaled up to a continuous system.
DISTRIBUTION CHARACTERISTICS OF FERRO-TITANIUM OXIDE MINERAL ON LOW-GRADE IRON SAND Suratman Suratman
Indonesian Mining Journal Vol 20 No 1 (2017): INDONESIAN MINING JOURNAL VOL. 20 NO. 1 April 2017
Publisher : Balai Besar Pengujian Mineral dan Batubara tekMIRA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30556/imj.Vol20.No1.2017.181

Abstract

Iron sand is known as one of the sources of TiO2 in the form of ilmenite or titanomagnetite mineral. Iron-titanium oxide mineral contained in Indonesia iron sand are classified as titanomagnetite. Indonesia possesses a lot of iron sand deposits such as at southern coast of Cilacap, Kebumen and other areas. The iron sand consists of magnetic and non-magnetic minerals as either loses or bound materials. Fractionation of Cilacap iron sand which employed three types of sieve (40, 60 and 80 meshes) showed that the iron sand is dominant in -40+60 fraction (68.38 g) while the most amount of iron and titania contents occurred at fraction of -80 mesh, namely 11.62 and 1.46%. Magnetic separation showed that the finer the particles and the higher the magnetic intensity, the higher the derived iron and titania. The process has also successfully increased the TiO2 content more than 5 times, from 0.325 to 1.67%.
MAKING OF IRON NUGGET FROM CONCENTRATED IRON SAND USING MINI-SIZED ROTARY KILN Nuryadi Saleh; Siti Rochani; Hasudungan Eric Mamby
Indonesian Mining Journal Vol 20 No 1 (2017): INDONESIAN MINING JOURNAL VOL. 20 NO. 1 April 2017
Publisher : Balai Besar Pengujian Mineral dan Batubara tekMIRA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30556/imj.Vol20.No1.2017.183

Abstract

The availability of energy becomes a major problem in the construction of iron mineral-based smelter to produce ferrous metals in the form of pig iron. Therefore, it is necessary to develop the Krupp-Renn technology that based on coal as a reducing agent to produce pig iron in the form of nuggets. Such a technology employs a rotary kiln that consumes less energy than other furnaces. In this study, reduction process of iron sand concentrates with coal as the reductant was accomplished in a mini-sized rotary kiln (0.6 m diameter and 6 m length). The process of iron nugget making from iron sand concentrate was conducted in two (2) stages, namely oxidation and reduction processes. The former was accomplished at a temperature above 800°C for 2 (two) hours to produce hematite phase. While the later was carried out at 1250-1300°C for 6-8 hours. Both processes produced iron nuggets that contained more than 90% Fe. The highest Fe content reached 96.49% Fe. Such a nugget could meet the requirement for steel making.
DESORPTION OF GOLD AND SILVER FROM ACTIVATED CARBON Lili Tahli; Tatang Wahyudi
Indonesian Mining Journal Vol 20 No 1 (2017): INDONESIAN MINING JOURNAL VOL. 20 NO. 1 April 2017
Publisher : Balai Besar Pengujian Mineral dan Batubara tekMIRA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30556/imj.Vol20.No1.2017.184

Abstract

Experiments of gold and silver elution were conducted using several parameters, either fixed or varying parameters. Ethanol volume, temperature and percent solid belonged to varying parameters while loaded carbon, stirring rate, concentrations of NaOH and NaCN served as fixed parameters. The experiment results showed that the optimum condition for such a process included 20% of ethanol volume, 80°C of temperature and solid fraction of 25%. Using such condition, the experiment was conducted for 10-hour contact time and yielded the highest desorption percentages for gold and silver, namely 80.10 and 70.73% respectively. The derived contents of gold and silver were 295.16 and 159.38 ppm while their achieved weights were 56.080 and 30.601 µ g. The fact that the achieved contents of gold and silver was close to the requirements for electrowinning process, it is suggested that the next process using a semi-continue one in terms of gaining a result that satisfies the requirement for electrowinning.
EXTRACTION OF LEAD FROM GALENA CONCENTRATES USING FLUOSILICIC ACID AND PEROXIDE Dessy Amalia; Yunita Ramanda; Maryono Maryono
Indonesian Mining Journal Vol 20 No 1 (2017): INDONESIAN MINING JOURNAL VOL. 20 NO. 1 April 2017
Publisher : Balai Besar Pengujian Mineral dan Batubara tekMIRA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30556/imj.Vol20.No1.2017.187

Abstract

A study on lead extraction from lead concentrate had been conducted. Galena is usually associated with other sulfide ores such as sphalerite.The lead concentrate was able to be extracted and purified into its metal through a leaching process using a selective solvent of fluosilicic acid (H2SiF6). Parameters used in this process include ratio (dose) of reactant (H2SiF6:H2O2), temperature (without heating; 30; 50; 70; 80; and 90°C) and particle size (-100+150#, -150+200#, -200+325, dan -325#).The best extraction was achieved using the particle size of -325 mesh. The amount of extracted lead was increased due to the rise of temperatureand dose of fluosilicic. The amount of peroxide addition was determined by its optimum influence on the lead extraction because its excess would produce PbSO4. The influence of H2SiF6 and H2O2doses was calculated using ANOVA.
THE OCCURRENCE OF METHANE GAS SEEPAGES IN THE UPPER KETUNGAU AREA, WEST KALIMANTAN Hermes Panggabean
Indonesian Mining Journal Vol 8 No 01 (2005): INDONESIAN MINING JOURNAL Vol. 8 No. 1 February 2005
Publisher : Balai Besar Pengujian Mineral dan Batubara tekMIRA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30556/imj.Vol8.No01.2005.205

Abstract

Uplifting event on the Boyan Melange, that formerly known as the Semitau High in West Kalimantan has resulted in the separated Ketungau and Melawi Basins in the Late Cretaceous or Early Tertiary time. Initial stage of sedimentary deposition within the Ketungau Basin occurred in Early Eocene, depositing a fluvial conglomerate unit that subsequently changes upwards into a shallow marine and lacustrine unit of the Kantu Formation. The Eocene Kantu Formation consists of alternating dark grey and laminated carbonaceous shale, mudstone and siltstone with coal seam intercalations and the Ketungau Formation, which is composed of alternating dark grey and laminated carbonaceous shale, claystone, siltstone with coal seam intercalations inferred to be able performed as a source rocks for initial biogenic methane. On the other hand, the Oligo-Miocene Tutoop Sandstone that consists of dominantly a coarse- to fine-grained clastic unit may potentially conduct as a secondary reservoir rock for coalbed methane. Gas seepages that have been observed on surface along the tributary of Peturau and Sebuntung Rivers in the Upper Ketungau region is presumed to be derived from a coalbed methane source within the Kantu and Ketungau Formations. The methane gas is assummed to be ascending on surface through structural faults that trending NW-SE direction.
VITRINITE REFLECTANCE VARIATION OF OMBILIN COAL ACCORDING TO ITS PETROGRAPHIC ANALYSIS Binarko Santoso; Bukin Daulay
Indonesian Mining Journal Vol 8 No 01 (2005): INDONESIAN MINING JOURNAL Vol. 8 No. 1 February 2005
Publisher : Balai Besar Pengujian Mineral dan Batubara tekMIRA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30556/imj.Vol8.No01.2005.207

Abstract

Rank and type variations of the Ombilin coals were studied by petrographic examination of thirty-six samples. The coals are mainly dominated by vitrinite and rare exinite, inertinite and mineral matter.  Vitrinite macerals are dominated by detro- and telovitrinite. Cutinite, liptodetrinite and suberinite are the dominant exinite macerals in the coals. Inertinite macerals in the coals include sclerotinite, inertodetrinite and semifusinite. Mineral matter is rare in the coals consisting of clay and pyrite. The type differences largely reflect climatic influence and differences in peat conditions. The higher vitrinite reflectance of some of the coals is a result of igneous intrusion. The thermally affected coal has vitrinite reflectances between 3.39% and 4.69% indi- cating a coalification stage of anthracite; whereas the thermally unaffected coal is between 0.55% and 0.77% with ranks of sub-bituminous to high volatile bituminous, as classified by the Australian classifica- tion. The thermal effect has also an impact to the vitrinite content in the coals. The thermally affected coals contain 86-99% vitrinite, whereas the thermally unaffected coals contain 80-96% vitrinite. This is because in the thermally affected coals, exinite cannot be distinguished from vitrinite, and it appears to contain high proportion of vitrinite.
UPGRADING OF INDONESIAN LOW RANK COAL BY STEAM DRYING METHOD Datin Fatia Umar; Bukin Daulay; Hiromoto Usui; Slamet Suprapto
Indonesian Mining Journal Vol 8 No 01 (2005): INDONESIAN MINING JOURNAL Vol. 8 No. 1 February 2005
Publisher : Balai Besar Pengujian Mineral dan Batubara tekMIRA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30556/imj.Vol8.No01.2005.208

Abstract

Experiments were carried out to produce upgraded coals with low moisture content by steam drying method. An Indonesian low rank coal, Berau coal with moisture content of 16.13% and calorific value of 5324 cal/g in air dried basis (adb) was treated by steam drying at temperature of 225 - 300°C in an autoclave to study process temperature effect. The results of proximate and ultimate analyses show that moisture content decrease by increasing the temperature process. The moisture content reduces to 0.86% and the calorific value increases up to 6760 cal/g in adb when the coal has been treated at the temperature of 300°C. Furthermore, the specific surface area and combustion characteristics of coals were influenced by the upgrading process.
THE OPTIMALIZATION OF LUBRICANT WASTE RECYCLING WITH LOW RANK COAL AS CONTAMINANT ABSORBANCE Nining Sudini Ningrum; Ika Monika
Indonesian Mining Journal Vol 8 No 01 (2005): INDONESIAN MINING JOURNAL Vol. 8 No. 1 February 2005
Publisher : Balai Besar Pengujian Mineral dan Batubara tekMIRA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30556/imj.Vol8.No01.2005.209

Abstract

The research of lubricant waste recycling by means of low rank coal as absorbent is one of the ways to render efficient the oil consumption also to maximize the value of low rank coal. This research is a continuation research with a fixed variable, in which the amount of coal is increased to 20% from the amount of the lubricating oil and the heating time which took 2 hours was variated with the heating temperature variable from 150°C to 350°C, the size of coal granule –8+10, -12+14 and –20+24 mesh. The research output shows that the optimum temperature of the lubricating oil recycling by means of coal as absorbent is reached in the temperature of 300°C for the coal with the size –12+14 mesh. In this condition Ca content reduce from 1447 to 150 ppm, Zn reduce from 887 to 17,4 ppm, Fe reduce from 47,1 to 43,5 ppm, Ni reduce from 15,4 to 6,2 ppm and Cr and Cu are all absorbed. The coal resulted from the recycling process can be used as a direct fuel with the calorific value between 5000 to 6500 cal/g and the colour of the lubricating oil resulted from separation (base oil) is yellowish dark.

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