Garuda - Garba Rujukan Digital

Preliminary Study of Rare Earth Element and Yttrium (REY) Content of Coal In Sangatta Coalfield, East Kalimantan, Indonesia Anggara, Ferian; T.B.M. Petrus, Himawan; Patria, Aulia Agus; Bangun, Aya Shika
Indonesian Journal on Geoscience Vol 7, No 3 (2020)
Publisher : Geological Agency

DOI:10.17014/ijog.7.3.305-314Kutai Basin is known as one of the most prolific sedimentary coal basins in Indonesia. Coal-bearing sequence in Kutai Basin is mainly Miocene to Eocene in age in which the coal seams are mostly in Miocene strata. Researchers have found that REY concentration in some coals and coal ashes are equal to or higher than that of the conventional deposit, as such coal deposit has become an important source for REY. Moreover, REY recovery as by-product from coal deposits could alleviate the â€œdirtyâ€ into â€œcleanâ€ coal energy. Referring to this shifted paradigm, a study on REY in Indonesian coal has put interest not only for researchers, but also for all stakeholders in this country. In this particular study, Sangatta coalfield in East Kalimantan was chosen as the area to observe the REY concentration. This area has been set due to its interesting geological setting, especially Pinang Dome that might have coal deposit with enriched REY. For the analyzed samples, drill cores were collected and then observed closely using polished section, inductively coupled plasma atomic emission spectroscopy (ICP-AES), and inductively coupled plasma mass spectrometry (ICP-MS). Based on the collected data, the highest REY concentration in coal deposit is located in the nearest part of the Pinang Dome. The REY content in coal deposit is associated with hydrothermal fluids and sediment source. These data suggest that there is a significant effect on Pinang Dome in the REY content in the coal deposit.

Spatial Variability in Macro- and Microtextures of A Tropical Intermontane Peatland: Preliminary Investigation into The Kutai Lake Peat System, East Kalimantan, Indonesia Anggara, Ferian; Muchitawati, Guritno Safitri; Moore, Tim. A.; Septantia, Afrina
Indonesian Journal on Geoscience Vol 8, No 2 (2021)
Publisher : Geological Agency

DOI:10.17014/ijog.8.2.275-296Peat deposits of the Muara Siran, East Kalimantan area, were investigated for their vertical and lateral succession, to examine the characteristic variability, particularly its macro- and microtextures. The deposits are situated in the Kutai Basin, in the vicinity of several Cenozoic coal deposits. Peat samples were taken from twenty-seven coring sites in the area, using a MacCaulay peat corer. The Muara Siran peatlands lie between the Kedang Kepala and Belayan Rivers. Siran Lake lies between these rivers and within the peat system. The peat thickness varied from 0.5 m to 12 m. Decomposed sapric peat formed the basal and margins of the deposit, overlain by moderately decomposed hemic peat in the central part of the peatlands, though both sapric and hemic peat types are interbedded at the margins of the mire. The fibric peat types were found mostly at the top of the mire and only distal from any active streams. Twenty-four samples of peat were freeze-dried for petrographic analyses of both plant part and maceral analyses using a reflected microscope. On the average, the dominant plant parts were stems and wood (i.e. secondary xylem). Maceral composition was mostly from the huminite group (on the average 89%), particularly the macerals humodetrinite and textinite. Macroscopic peat type and microscopic composition are linked. Fibric peat was found to be rich in wood and textinite. Hemic was mostly composed of stems and wood with textinite and humodetrinite as the most abundant macerals. Sapric peat has near equal proportions of stems, wood, and macerated tissue. Humodetrinite is the most abundant maceral in sapric. The average ash and sulfur content were low, 1.29 wt.% and 0.11 wt.%, respectively. Understanding the physical characteristics of inland peat as in Muara Siran peatland is essential to build knowledge of how inland peat is formed and what makes it different from coastal peat. Muara Siran is a unique, relatively small peatland in the central eastern Kalimantan which is still considerably pristine, hence may serve the aim of this study well. Â

Spatial Variability in Macro- and Microtextures of A Tropical Intermontane Peatland: Preliminary Investigation into The Kutai Lake Peat System, East Kalimantan, Indonesia Anggara, Ferian; Muchitawati, Guritno Safitri; Moore, Tim. A.; Septantia, Afrina
Indonesian Journal on Geoscience Vol 8, No 2 (2021)
Publisher : Geological Agency

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17014/ijog.8.2.275-296

DOI:10.17014/ijog.8.2.275-296Peat deposits of the Muara Siran, East Kalimantan area, were investigated for their vertical and lateral succession, to examine the characteristic variability, particularly its macro- and microtextures. The deposits are situated in the Kutai Basin, in the vicinity of several Cenozoic coal deposits. Peat samples were taken from twenty-seven coring sites in the area, using a MacCaulay peat corer. The Muara Siran peatlands lie between the Kedang Kepala and Belayan Rivers. Siran Lake lies between these rivers and within the peat system. The peat thickness varied from 0.5 m to 12 m. Decomposed sapric peat formed the basal and margins of the deposit, overlain by moderately decomposed hemic peat in the central part of the peatlands, though both sapric and hemic peat types are interbedded at the margins of the mire. The fibric peat types were found mostly at the top of the mire and only distal from any active streams. Twenty-four samples of peat were freeze-dried for petrographic analyses of both plant part and maceral analyses using a reflected microscope. On the average, the dominant plant parts were stems and wood (i.e. secondary xylem). Maceral composition was mostly from the huminite group (on the average 89%), particularly the macerals humodetrinite and textinite. Macroscopic peat type and microscopic composition are linked. Fibric peat was found to be rich in wood and textinite. Hemic was mostly composed of stems and wood with textinite and humodetrinite as the most abundant macerals. Sapric peat has near equal proportions of stems, wood, and macerated tissue. Humodetrinite is the most abundant maceral in sapric. The average ash and sulfur content were low, 1.29 wt.% and 0.11 wt.%, respectively. Understanding the physical characteristics of inland peat as in Muara Siran peatland is essential to build knowledge of how inland peat is formed and what makes it different from coastal peat. Muara Siran is a unique, relatively small peatland in the central eastern Kalimantan which is still considerably pristine, hence may serve the aim of this study well. Â

Recovery of Rare Earth Elements and Yitrium from non-Magnetic Coal Fly Ash using Acetic Acid Solution Hotden Manurung; Widya Rosita; I Made Bendiyasa; Agus Prasetya; Ferian Anggara; Widi Astuti; Dagus Resmana Djuanda; Himawan Tri Bayu Murti Petrus
Jurnal Metal Indonesia Vol 42, No 1 (2020): Metal Indonesia
Publisher : Balai Besar Logam dan Mesin

The increasing need of REY has been observed in industries such as catalyst industry, metallurgy, military, health and renewable energy resources. REY such as Ce, Nd, Y, and Eu has a prominent evidence to improve material properties such as high electropositive, good conductivity and renewable energy. Due to this increasing need of REY, exploration of alternative source has been conducted. One of the promising alternative sources is coal fly ash. The conventional method to recover REY from coal fly ash using inorganic acids is harmful to the environment. Thus, the exploration of REY extraction from coal fly ash using organic acid has been proposed in this study. The leaching agent was acetic acid applied for all operating condition. Regarding to the mineralization of REY in the form of siliceous minerals (non-magnetic coal fly ash). Silicate digestion was conducted using sodium hydroxide 8 M with solid-to-liquid of 25% to decompose the siliceous mineral. Further, the REY bound siliceous mineral will change to REY(OH)3. Temperature as one of the operating conditions was varied. The maximum recovery of leaching 20.58 %, 43.53 %, 17.38%, 40.96 %, 18.45 % and 32.74 % were achieved for Ce, Dy, La, Nd, Y and Yb respectively at temperature of 90 0C pH 1.74 and 120 minutes. For some metals, increasing the temperature higher than 70 0C does not provide any significant effect for REY recovery such as La and Ce.

Estimated Emplacement Temperatures for a Pyroclastic Deposits from the Sundoro Volcano, Indonesia, using Charcoal Reflectance Analyses Agung Harijoko; Nanda Ayu Safira Mariska; Ferian Anggara
Indonesian Journal on Geoscience Vol 5, No 1 (2018)
Publisher : Geological Agency

DOI: 10.17014/ijog.5.1.1-11This study applies the charcoalification measurement method to infer the emplacement temperature of pyroclastic flow deposits erupted from the Sundoro Volcano, Indonesia. This pyroclastic flow partially covered the Liyangan archeological site, a site where Hindu temples were constructed approximately 1,000 years ago. Five samples of charcoal collected from this area were analyzed for reflectance and elemental composition. Charcoalification temperatures were determined based on mean random optical reflectance values (Ro) plotted on published Ro-Temperature curves. Charcoalification temperatures were also estimated using a published formula based on the charcoal’s hydrogen to carbon (H/C) ratio. These two methods for determining pyroclastic flow deposition temperatures indicated that the pyroclastic deposits that entombed the Liyangan archeological site ranged from 295° to 487°C when they were deposited. This study used very simple, rapid, precise, and low-cost methods of charcoalification temperature measurement to infer the emplacement temperature of a pyroclastic deposit. This estimation procedure could be applied widely to predict emplacement temperatures in volcanic area in Indonesia to enhance volcanic hazard mitigation.

Syn-sedimentary Mafic Volcanics in the Eocene Coal-bearing Tanjung Formation, Senakin Peninsula, South Kalimantan (Borneo), Indonesia Tim Allen Moore; Mike C. Friederich; Jessica Trofimovs; Ferian Anggara; D. Hendra Amijaya
Indonesian Journal on Geoscience Vol 7, No 1 (2020)
Publisher : Geological Agency

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17014/ijog.7.1.65-85

DOI:10.17014/ijog.7.1.65-85Syn-sedimentary mafic volcanism has been identified within a rift setting (Eocene Tanjung Formation) in the Senakin Peninsula, southeast Kalimantan. Fine-grained, dark-grey basalt lava occurs and has prominent vertically oriented columnar jointing. Petrographically, the basalt is composed of small euhedral pyroxene, olivine, and lath-shaped plagioclase phenocrysts within a very fine-grained dark coloured groundmass. A volcaniclastic unit also occurs and in outcrop has sharp contacts with underlying and overlying sedimentary mudstone. The unit is composed of cm-scale clasts of fine-grained to glassy textured basalt with vesicles of varying size and abundance. Euhedral pyroxene phenocrysts are observed within the clasts, although some with overprinting alteration. Palagonite alteration on the margins of some clasts is noted and is indicative of mafic composition volcanic material that has come into contact with sea water. Presence of bivalve and coral fragments in sandstone and mudstone underlying the volcaniclastic unit indicates emplacement into a marine environment. Core description from 33 locations over an 18 km transect length show that both the basalt and volcaniclastic sediments are extensive throughout the east Senakin area. Lithological relationships and compositional similarities between the basalt and volcaniclastic sediment suggest they are related and were contemporaneous with sedimentation within the Tanjung Formation. It is proposed that the basalt unit is designated the Tanah Rata Basalt Member of the Tanjung Formation. If a wider distribution occurs for the volcaniclastic unit it is proposed that it is termed the Gumbil Volcaniclastic Member of the Tanjung Formation.

Preliminary Study of Rare Earth Element and Yttrium (REY) Content of Coal In Sangatta Coalfield, East Kalimantan, Indonesia Ferian Anggara; Himawan T.B.M. Petrus; Aulia Agus Patria; Aya Shika Bangun
Indonesian Journal on Geoscience Vol 7, No 3 (2020)
Publisher : Geological Agency

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17014/ijog.7.3.305-314

DOI:10.17014/ijog.7.3.305-314Kutai Basin is known as one of the most prolific sedimentary coal basins in Indonesia. Coal-bearing sequence in Kutai Basin is mainly Miocene to Eocene in age in which the coal seams are mostly in Miocene strata. Researchers have found that REY concentration in some coals and coal ashes are equal to or higher than that of the conventional deposit, as such coal deposit has become an important source for REY. Moreover, REY recovery as by-product from coal deposits could alleviate the “dirty” into “clean” coal energy. Referring to this shifted paradigm, a study on REY in Indonesian coal has put interest not only for researchers, but also for all stakeholders in this country. In this particular study, Sangatta coalfield in East Kalimantan was chosen as the area to observe the REY concentration. This area has been set due to its interesting geological setting, especially Pinang Dome that might have coal deposit with enriched REY. For the analyzed samples, drill cores were collected and then observed closely using polished section, inductively coupled plasma atomic emission spectroscopy (ICP-AES), and inductively coupled plasma mass spectrometry (ICP-MS). Based on the collected data, the highest REY concentration in coal deposit is located in the nearest part of the Pinang Dome. The REY content in coal deposit is associated with hydrothermal fluids and sediment source. These data suggest that there is a significant effect on Pinang Dome in the REY content in the coal deposit.

Spatial Variability in Macro- and Microtextures of A Tropical Intermontane Peatland: Preliminary Investigation into The Kutai Lake Peat System, East Kalimantan, Indonesia Ferian Anggara; Guritno Safitri Muchitawati; Tim. A. Moore; Afrina Septantia
Indonesian Journal on Geoscience Vol 8, No 2 (2021)
Publisher : Geological Agency

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17014/ijog.8.2.275-296

DOI:10.17014/ijog.8.2.275-296Peat deposits of the Muara Siran, East Kalimantan area, were investigated for their vertical and lateral succession, to examine the characteristic variability, particularly its macro- and microtextures. The deposits are situated in the Kutai Basin, in the vicinity of several Cenozoic coal deposits. Peat samples were taken from twenty-seven coring sites in the area, using a MacCaulay peat corer. The Muara Siran peatlands lie between the Kedang Kepala and Belayan Rivers. Siran Lake lies between these rivers and within the peat system. The peat thickness varied from 0.5 m to 12 m. Decomposed sapric peat formed the basal and margins of the deposit, overlain by moderately decomposed hemic peat in the central part of the peatlands, though both sapric and hemic peat types are interbedded at the margins of the mire. The fibric peat types were found mostly at the top of the mire and only distal from any active streams. Twenty-four samples of peat were freeze-dried for petrographic analyses of both plant part and maceral analyses using a reflected microscope. On the average, the dominant plant parts were stems and wood (i.e. secondary xylem). Maceral composition was mostly from the huminite group (on the average 89%), particularly the macerals humodetrinite and textinite. Macroscopic peat type and microscopic composition are linked. Fibric peat was found to be rich in wood and textinite. Hemic was mostly composed of stems and wood with textinite and humodetrinite as the most abundant macerals. Sapric peat has near equal proportions of stems, wood, and macerated tissue. Humodetrinite is the most abundant maceral in sapric. The average ash and sulfur content were low, 1.29 wt.% and 0.11 wt.%, respectively. Understanding the physical characteristics of inland peat as in Muara Siran peatland is essential to build knowledge of how inland peat is formed and what makes it different from coastal peat. Muara Siran is a unique, relatively small peatland in the central eastern Kalimantan which is still considerably pristine, hence may serve the aim of this study well.

KARAKTERISASI DAN PEMANFAATAN LUMPUR SIDOARJO UNTUK CAMPURAN BAHAN BAKU PEMBUATAN BRIKET Kezia Kartika Windya Kezia Kartika Windya; Wahyu Wilopo Wahyu Wilopo; Ferian Anggara Ferian Anggara
Jurnal Geomine Vol 6, No 3 (2018): Edisi Desember 2018
Publisher : Universitas Muslim Indonesia

Briket merupakan bahan bakar alternatif yang terbuat dari sisa bahan organik dengan campuran bahan perekat organik maupun anorganik untuk memperbaiki karakteritik biomassa. Penggunaan lumpur Sidoarjo digunakan sebagai bahan perekat anorganik serta kandungan unsurnya dapat meningkatkan nilai kalori briket. Penelitian ini dilakukan untuk mengetahui karakteristik dan nilai optimum briket yang dihasilkan dari penggunaan lumpur Sidoarjo. Hal tersebut dikarenakan briket yang dihasilkan ditentukan oleh karakteristik lumpur sebagai mineral lempung. Karakteristik lumpur dan biomassa yang diteliti meliputi mineralogi yang dilakukan dengan cara XRD (x-ray diffraction), kandungan unsur kimia lumpur dengan metode SEM-EDX (scanning electron microscope), ICP (Inductively Coupled Plasma) dan Gravimetri, serta nilai kalor dengan metode Bomb calorimetter. Karakteristik briket dihasilkan dengan analisis proksimat, nilai kuat tekan dan nilai kalor. Mineralogi lumpur Sidoarjo adalah smektit, plagioklas, kuarsa, pirit, monmorilonit, ilit dan kaolinit. Kandungan senyawa kimia lumpur menunjukkan SiO2 (47,51%), Al2O3 (20,09%), Fe2O3 (7,28%), CaO (1,57%). Kandungan unsur lumpur menunjukkan Fe (33,5%) Al (9,36%), Si (1,08%). Nilai kalori briket yang dihasilkan dari penggunaan lumpur semakin meningkat. Kuat tekan briket yang dihasilkan memenuhi standar dan menunjukkan bahwa briket tidak mudah pecah. Karakteristik briket dengan campuran perekat lumpur Sidoarjo menghasilkan peningkatan nilai kalor yag cukup tinggi sebesar 5971,59 kal/gr, kadar lengas 5,67%, volatile matter 14,60%, kadar abu 8,1%, kadar karbon tertambat 71,62%, nilai kuat tekan 76,10 kg/cm2. Data pengujian analisis proksimat, nilai kalor dan nilai kuat tekan memperlihatkan pengaruh penggunaan lumpur Sidoarjo dapat memenuhi standarisasi briket berdasarkan acuan SNI (Standard Nasional Indonesia).

Karakteristisasi Petrografi dan Geokimia Batubara Formasi Bobong Daerah Taliabu, Provinsi Maluku Utara Supardin Nompo; Donatus Hendra Amijaya; Ferian Anggara
Jurnal Geomine Vol 9, No 1 (2021): Edisi April 2021
Publisher : Universitas Muslim Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33536/jg.v9i1.764

Formasi Bobong yang melampar di daerah Pulau Taliabu merupakan formasi pembawa batubara yang berumur jura. Penelitian ini bertujuan untuk menganalisis karakteristik petrografi organik dan geokimia di daerah penelitian. Metode yang digunakan meliputi observasi lapangan dan pengambilan sampel batubara dengan metode channel sampling ply by ply. Analisis laboratorium yang dilakukan terhadap 10 sampel batubara meliputi analisis petrografi organik, proksimat, ultimat, gross calorific value (nilai kalori). Batubara Formasi Bobong terdiri dari 3 seam, yaitu seam 1 dengan ketebalan 0,5 m hingga1 meter, seam 2 dengan tebal 1 meter dan seam 3 dengan tebal 0,50 m hingga 0,90 meter. Ketiga seam batubara tersebut secara dominan termasuk dalam litotipe bright coals dan banded bright coals. Batubara tersebut memiliki gross calorific 13.896,26-15.362,54 (Btu/lb) dan nilai proksimat berupa karbon tertambat 36,10 - 43,86 (%, adb), kandungan zat terbang 38,25 - 47,91 (%, adb), kandungan air 6,54 – 12,23 (%, adb) dan kandungan abu 64,46 - 21,31 (%, adb). Batubara seam 1, seam 2 dan seam 3 di daerah penelitian merupakan high volatile A bituminous coals. Ultimat pada batubara Formasi Bobong adalah karbon 64,46 - 74,75 (%, daf), hidrogen 6,27 - 6,92 (%, daf), nitrogen 0,76 - 0,87 (%, daf), sulfur 4,41 - 7,93 (%, adb) dan oksigen 9,45 - 18,07 (%, daf). Sedangkan untuk nilai maseral berupa vitrinit adalah 69,75 – 77,52 (%, vol), liptinit 17,56 - 22,50 (%, vol) dan inertinit 3,60 - 7,75 (%, vol).

Title

Found 41 Documents
Search

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Title Search

Found 41 Documents Search

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Title

Found 41 Documents
Search