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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 257 Documents

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INDICATION OF GRAIN ENLARGEMENT IN DRY GRINDING PROCESS USING A ROD MILL, OBSERVED AT INCREASED MILLING TIME Sedarta Sedarta; Lismawaty Lismawaty; Mahyuzar Masri
Indonesian Mining Journal Vol 18, No 2 (2015): INDONESIAN MINING JOURNAL Vol. 18 No. 2 June 2015
Publisher : Puslitbang tekMIRA

The aim of the study is to determine whether size distribution and grain properties of the milling product can be controlled by rod size, milling time or a combination of both. Milling experiments had been carried out using rod of 9.8, 23.8, and 46.0 cm respectively as well as milling time of 30, 60, 210, 360 and 600 minutes. Grain properties were studied by sieve analysis and binocular microscope. The entire rod sizes and 30-minutes mill- ing time yielded grain enlargement as a result of van der Waals forces among colliding particles with the help of dampness as a binding media. The longer the milling time, the more coalesce the grains. It is also known that the smaller the particles, the lesser the particle density but the brighter the grain appearance. For all combina- tions, grain enlargement took place within size of -60 +100# showing the highest weight proportion in the period of 286.54 minutes.

PETROGRAPHIC STUDY ON GENESIS OF SELECTED INERTINITE-RICH COALS FROM JAMBI SUBBASIN NINING S. NINGRUM; BINARKO SANTOSO
Indonesian Mining Journal Vol 12, No 3 (2009): INDONESIAN MINING JOURNAL Vol. 12 No. 3 October 2009
Publisher : Puslitbang tekMIRA

Genesis of the coal macerals in the studied area depends particularly on the tectonic and geologic setting. The coals formed in the Jambi Subbasin, which is the back-arc basin associated with the fluvial to deltaic environment results in both rich in vitrinite and inertinite contents. The vitrinite content is associated with the bright lithotype deposited in the wet-swampy area; whereas the inertinite is associated with the dull lithotype deposited in the dry-swampy area. The presence of mineral matter causes the dull lithotype as well. The presence of the liptinite maceral cannot be correlated with the lithotypes. This maceral composition is the extreme phenomenon, because most of the Sumateran coals contain very low inertinite content (<5%) with very high vitrinite content (>80%). The coals contain low ash and low (0.1-0.4%) to medium sulphur (1.3- 1.6%) contents. The above evidence is the answer of the extreme evidence, and this is the objective of presenting this paper. Methods applied in this study include in-situ coal sampling for microscopic analyses, which are petrographic determination and reflectance examination. The samples were also analysed for their proximate according to ASTM (2002).

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 : Puslitbang tekMIRA

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.

PETROGRAPHIC PROPERTIES OF PALAEOGENE SOUTHERN BANTEN COAL SEAMS WITH REGARD TO GEOLOGIC ASPECTS BINARKO SANTOSO
Indonesian Mining Journal Vol 13, No 2 (2010): INDONESIAN MINING JOURNAL Vol. 13 No. 2 June 2010
Publisher : Puslitbang tekMIRA

The Palaeogene coal deposits occur in three coalfields in the Banten Province, which are distributed in Bayah, Cihideung and Cimandiri. The Bayah coals (Eocene Bayah Formation) mainly comprise vitrinite and subordinate inertinite and are of sub-bituminous A to high volatile bituminous A ranks (0.60-0.79%). The Cihideung coals (Eocene Bayah Formation) are of sub-bituminous A to medium volatile bituminous ranks (0.53-1.23%) and composed mainly of vitrinite. The Cimandiri coals (Oligocene Cijengkol Formation) are composed of variable proportions of vitrinite in the main and inertinite in very minor amounts. The rank of the coals is sub-bituminous A and high volatile bituminous A varying between 0.64% and 0.83% in vitrinite reflectance. Evaluation of these coals indicates that they tend to have similar coal petrographic properties and were formed in a littoral-neritic environment. Some of the coals, especially the Cihideung coals, show the highest vitrinite content and higher rank (0.99-1.23%), which is high A-medium volatile bituminous, due to an intrusive activity. Most of the coals have high contents of mineral matter (pyrite), mainly in the Bayah coals (2-13%), and this indicates that the coals were influenced by marine incursion during their deposition.

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 : Puslitbang tekMIRA

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.

MINERALIZATION OF THE BUSANG PROSPECT, EAST KALIMANTAN Harry Utoyo
Indonesian Mining Journal Vol 17, No 1 (2014): INDONESIAN MINING JOURNAL Vol. 17 No. 1 FEBRUARY 2014
Publisher : Puslitbang tekMIRA

Busang prospect occurs in the Kalimantan Volcanic belt of East Kutai Regency, East Kalimantan. The prospect occupied the undulated morphology known as Bukit Busang. It is approximately 150 km southwest of the Kelian mine. Geologically, the Busang prospect is hosted within the volcanic rocks (tuff, breccia, dacite and adesite). The volcanic sequences are intruded by the Oligo-Miocene Atan Diorite. The hydrothermal alteration consists of silicification and argillic assemblages. Silicification is the presence of quartz and opaline silica while the argillic alteration is characterized by the presence of illite-kaolin clay. Mineralogy of the deposit comprises of gold, minor chalcopyrite, lead, sphalerite, pyrite and marcasite. Style of mineralization is quartz veins and dissemination within the host rocks. Analytical results from quartz samples show that the content of gold ranges from 0.016-66,06 ppm, Cu : 29-1810 ppm, Pb : 925-117675 ppm and Zn : 197-24908 ppm. The fluid inclusion measurement from two quartz veins indicate that the homogenization temperature ranges from 317.3-323.0ºC. The fluid salinity is very low, 0.5 wt % NaCl. On the basis of mineralogy, hydrothermal alteration, quartz textures and homogeniza- tion temperature, the Busang prospect is categorized as a low sulfidation epithermal type. The genetic model of the Busang prospect is possibly due to the intrusion of the Oligo-Miocene Atan Diorite.

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 : Puslitbang tekMIRA

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.

PROCESS MINERALOGY FOR EVALUATING MINERALOGY, PHYSICAL AND CHEMICAL CHARACTERS OF THE TAILINGS COMES FROM GOLD PROCESSING Tatang Wahyudi
Indonesian Mining Journal Vol 17, No 3 (2014): INDONESIAN MINING JOURNAL Vol. 17 No. 3 OCTOBER 2014
Publisher : Puslitbang tekMIRA

Based on mineralogy, physical and chemical analyses, character of gold-processing tailings from Pongkor showed relatively complex condition. Gold particles were normally included by either sulfide (pyrite, chalcopyrite, galena, arsenopyrite, sphalerite etc.) or silicate minerals (mainly quartz). The inclusion structure performed single, double or multiple forms. Single inclusion meant that gold particle(s) was encased by one mineral phase while double and multi inclusions implied that the gold was sheathed by two or more phases. Gold was distributed along the micro-cracks of either similar or different phase. Chemical analyses showed that Pongkor tailings were characterized by several elements that might be ineffective for gold leaching by cyanide. Preg-robbing solution might be occurred.

FACTORS CONTROLLING PETROGRAPHIC COMPOSITION OF NEOGENE TENGGARONG COALS-KUTAI BASIN-EAST KALIMANTAN Binarko Santoso
Indonesian Mining Journal Vol 19, No 3 (2016): INDONESIAN MINING JOURNAL VOL. 19 NO. 3, October 2016
Publisher : Puslitbang tekMIRA

Petrographic composition of the Neogene Tenggarong coals in the Kutai Basin-East Kalimantan indicates its geological setting. The aim of this study is to obtain an understanding of the geologic aspects controlling the petrographic composition of the coals.Variation of type and rank in the coals was determined by petrographic examination of twenty-two samples. The coals are absolutely dominated by vitrinite, common liptinite and rare inertinite and mineral matter. Vitrinite macerals are dominated by detrovitrinite and telovitrinite. Cutinite and resinite are the dominant liptinite macerals in the coals. The inertinite macerals include semifusinite, inertodetrinite and sclerotinite. Clay and pyrite are the dominant mineral matters in the coals. The type differences largely reflect climatic influence and differences in peat conditions. Rank of the coals, in general, depends largely on the stratigraphic position. Reflectance measurements on the coals indicate that there is a slightly difference in rank. The coals are sub-bituminous rank (Rvmax of 0.40-0.47%). The change in vitrinite reflectance of the coals is due to the thicker cover/overburden on the high rank coals. Nevertheless, the vitrinite reflectance is higher in some coals in the Loa Kulu area (Rvmax of 0.48-0.57%) due to its stratigraphic position that is at the bottom of the sequence. The type and rank characteristics of the coals clearly influence the utilization. The coals are suited to utilize for direct combustion and therefore, the major utilization potential would be for power generation.

REMOVAL OF METALLIC IMPURITIES FROM QUARTZ SAND USING OXALIC ACID Suratman Suratman
Indonesian Mining Journal Vol 18, No 3 (2015): INDONESIAN MINING JOURNAL Vol. 18 No. 3 October 2015
Publisher : Puslitbang tekMIRA

Quartz sand of Mojosari deposit from Rembang, Central Java has been beneficiated using oxalic acid to en- hance its purity, especially that is associated with the removal of iron oxide impurities. The removal of metallic impurities has been studied under experimental conditions to optimize the process parameters such as oxalate concentration (0.1-0.5M), leaching temperature (25-50°C) and pH of solution (1-5). The optimum leaching pro- cess removed iron from originally 1.44% to reach a level of 0.243% (82% removal of iron) with the SiO2 content increases from 95.50 up to 97.77%. The obtained beneficiated quartz sand matches the required Fe level for glass insulating fibers industry, which is less than 0.3%. The best result was yielded under experimental condi- tion using oxalic acid at concentration of 0.3M, pH 1, temperature of 40°C for 4 hours of leaching process. The experimental results of this study have opened up a practically significant and technically viable approach for the production of quartz sand suitable for glass insulating fiber industry.

Page 3 of 26 | Total Record : 257

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Contact Name
Bachtiar Efendi

Contact Email
bachtaireaje@gmail.com

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

Editorial Address
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Location
Kota bandung,

Jawa barat

INDONESIA