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INDONESIA
Indonesian Mining Journal
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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ANALYSIS OF POTENTIAL ENERGY AND ENVIRONMENTAL IMPACT FROM COAL GASIFICATION THROUGH SIMULATION OF PLASMA GASIFICATION PROCESS OF INDONESIAN LOW-RANK COAL Priyo Adi Sesotyo; Muhammad Nur; Oki Muraza
Indonesian Mining Journal Vol 24, No 1 (2021): INDONESIAN MINING JOURNAL, Vol. 24 No. 1, April 2021
Publisher : Puslitbang tekMIRA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30556/imj.Vol24.No1.2021.1192

Abstract

Indonesia's coal reserve is abundant with its lower price and widely distributed than oil and natural gas. However, the coal emits high carbon dioxide gas (CO2) and sulfur compounds (H2S, SOx) to the environment during utilization. Plasma gasification can overcome those lacks using the external electric energy through a plasma torch. The chemical properties of coal have impacts on the energy content and environmental benchmarking. Using steam as a gasifying agent should be adequate to produce H2 and CO syngas. A research has been carried out to analyze and understand the benefit of using different gasifying agent for maximizing the H2 production and minimizing the environmental impact. Pure Steam (PS) gasifying agent to coal ratio of 0.4 has shown 43.76% H2 composition in syngas and cold gasification efficiency (CGE) with 37.71%. The PS to coal ratio of 0.2 has a significant carbon conversion efficiency of 4.75% and the PS to coal ratio of 0.6 has a gross energy potential of 86.5 kW. Using such the PS is significantly better than the mixture of steam oxygen (SO) as the gasifying agent since it needs to have a greater SO flow rate to have the SO to coal ratio of 1.00.
STABILITY STUDY OF OPEN MINE SLOPES AT PIT 22 GN PT KITADIN SITE EMBALUT, KUTAI KARTANEGARA REGENCY, EAST KALIMANTAN PROVINCE Tandidatu T. Deny; Sundek Hariyadi
Indonesian Mining Journal Vol 24, No 1 (2021): INDONESIAN MINING JOURNAL, Vol. 24 No. 1, April 2021
Publisher : Puslitbang tekMIRA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30556/imj.Vol24.No1.2021.1044

Abstract

The stability of slope, both on the slope of work and the final slope, is a very important aspect of slope stability, both on the slope of work and the final slope in open pit mining activities. The inconsistency of the slopes will result in the collapse of rocks around the excavation site. This happens because the condition of the rock when it has not been excavated is generally balanced. However, due to the discontinuous patterns that occur other than naturally and also due to the mining activities such as excavation, blasting and others, cause a reduction in the retaining force of the rock on the slope results in the equilibrium of the force tends to shift and is not balanced. Study of the stability of the open pit highwall slope at PIT 22 GN PT Kitadin Site Embalut, Kutai Kartanegara Regency, East Kalimantan Province was carried out with the aim to know the rock characteristics, to calculate slope geometry stable safety factors, and to recognize the type of landslide using a bishop method. The results of the modeling consist of several heights and slopes, as well as angles that is formed. Section AA’ has a safety factor value of 1.387, section BB has a safety factor of 1.482, section BB' has a safety factor value of 1.390, section DD' has a safety factor value of 1.318, section EE has a safety factor value of 2,381, section FF' has a safety factor value of 2.426, section GG' has a safety factor value of 2.424, section HH 'has a safety factor value of 2.339.
SHALLOW SEISMIC REFLECTION SURVEY FOR IMAGING DEEP-SEATED COAL LAYER - CASE STUDY FROM MUARA ENIM COAL Muhammad Rizki Ramdhani; Muhammad Abdurachman Ibrahim; Hans E. A. Siregar; Tony Rahadinata
Indonesian Mining Journal Vol 24, No 1 (2021): INDONESIAN MINING JOURNAL, Vol. 24 No. 1, April 2021
Publisher : Puslitbang tekMIRA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30556/imj.Vol24.No1.2021.1131

Abstract

Indonesia has a great potential for deep-seated coal resources. To assist and support the deep-seated coal exploration, a shallow seismic reflection method is applicable for this purpose. This study has conducted a shallow seismic reflection method in Musi Banyuasin Regency, South Sumatera Province. The Muara Enim coal target varies from 100 to 500 meters from the surface. The thickness of the coal layer varies from 2 to 10.65 meters. This study uses 48 channels with 14 Hz single geophone and Mini-Sosie as the energy source. The receiver and source interval is 15 meters. This study uses a fixed receiver and moving source configuration. From the interpreted seismic section, this study identified a deep-seated coal layer target. These layers are Mangus, Burung, Benuang, Kebon and Benakat layers. A simple interpretation is analyzed by combining the seismic amplitude characteristics and the thickness of the coal layer from the borehole data. From the interpreted seismic section, deep-seated coal layer targets have strong amplitude characteristics and are continuous from southwest to the northeast with a down-dip of around 20-30°. This study helps to inform the operator companies who develop the utilization of deep-seated coal (coalbed methane, underground coal gasification and underground coal mining) about the effective and proper geophysical method for imaging deep-seated coal layer.
THE APPLICATION OF FAILURE METHOD PROBABILITY FOR ANALYZING IN PIT DUMP STABILITY AT WEST BLOCK ‘X’ PIT PT BERAU COAL - EAST KALIMANTAN Yan Adriansyah; Rifqi Dwi Saprana; Irvan Sophian; Nur Khoirullah
Indonesian Mining Journal Vol 24, No 2 (2021): INDONESIAN MINING JOURNAL, Vol. 24 No. 2, October 2021
Publisher : Puslitbang tekMIRA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30556/imj.Vol24.No2.2021.1217

Abstract

West Block 'X' pit is one of the coal mining locations operated by the Lati Mine Operation – PT Berau Coal. Administratively, the Lati Mine is located as part of Berau Regency – East Kalimantan. The study area is located at the north side of the concession, in a syncline fold structure zone. The disposal design in this area needs to special attention from slope stability aspect due it is located on the wing of a mega syncline with a certain slope and constituent of unconsolidated materials. The pit design needs to be stable. The purpose of this study is to determine the level of stability of the in-pit dump by analyzing the current in-pit dump stability based on the value of the safety factor (FS) and the probability of failure (PoF). The method used in this study is a probabilistic analysis of slope stability based on the Morgenstern-Price method to obtain the value of the safety factor and the probability of failure. The study results show that the slope is in the safe category (stable slope) in the range of PoF values 0 – 1%, marginal slope 1 – 12%, and unstable slope above 12%. Based on such as results, it is necessary to modify the slope geometry categorized as unstable to carry out mine operation safely underneath the toe of slope.
GROWTH AND PRODUCTION OF TEA PLANT (Camellia sinensis (L.) O Kuntze) AFTER PRUNING WITH BIO-ORGANOMINERAL AMELIORANT Restu Wulansari; Faris Nur Fauzi Athallah; Eko Pranoto; Maryono Maryono; Didit Adi Darmawan; Budhy Agung Supriyanto
Indonesian Mining Journal Vol 24, No 2 (2021): INDONESIAN MINING JOURNAL, Vol. 24 No. 2, October 2021
Publisher : Puslitbang tekMIRA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30556/imj.Vol24.No2.2021.1235

Abstract

Tea plant (Camellia sinensis (L.) O Kuntze) is one of the important plantation commodities that has long been cultivated in Indonesia. Mineral based ameliorant fertilization is one of the important factors to produce high productivity and maintenance of healthy plants. Ameliorant bio-organomineral (BIOM) is a fertilizer that utilizes mineral resources, potential microbes, and organic matter. This study aimed to determine the effect of BIOM's ameliorant on plant health and tea productivity after pruning. The Randomized Block Design (RBD) was accomplished by 8 treatments and three replications (100% conventional fertilizer, 100% BIOM, 80% single fertilizer + 100% BIOM, 80% conventional fertilizer + 80% BIOM, 80% conventional fertilizer + 60% BIOM, 60% conventional fertilizer + 100% BIOM, 60% conventional fertilizer + 80% BIOM, and 60% conventional fertilizer + 60% BIOM). The results showed that there was a significant effect of the combination of conventional fertilizer and BIOM ameliorant on shoot production and pekoe percentage, but not significantly different in tipping production, pekoe shoot ratio and banji shoots. The combination of 60% conventional fertilizer and 60% BIOM showed the highest total production of 31.81 kg/plot. Shoot production in the BIOM treatment was 17.36% higher than that of the conventional fertilizer application. The application of BIOM ameliorant was able to improve the plant health after pruning on the GMB 7 clone.
EFFECT OF SULFUR IN THE REDUCTANTS ON SULFIDATION MECHANISM OF NICKEL LATERITE Fajar Nurjaman; Yuliana Sari; Anton Sapto Handoko; Fathan Bahfie; Ulin Herlina; Muhammad Miftahurrahman; Dedi Priadi; Deni Ferdian; Bambang Suharno
Indonesian Mining Journal Vol 24, No 2 (2021): INDONESIAN MINING JOURNAL, Vol. 24 No. 2, October 2021
Publisher : Puslitbang tekMIRA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30556/imj.Vol24.No2.2021.1216

Abstract

Processing nickel laterite conventionally, namely by pyrometallurgy method, requires high temperature and energy, results in a costive process. Due to its lower temperature reduction process, selective reduction with additives could be an alternative in nickel ore processing. Additives such as sulfur/sulfate have a critical role in promoting the low melting point phase. Sulfur is also found in coal. Therefore, it is important to investigate the effect of sulfur content in reductant on selective reduction of lateritic nickel ore. In this work, the effect of sulfur content (2.68% and 5% S) in anthracite coal as a reductant on selective reduction of limonitic ore was studied clearly. Nickel ore, reductant and sodium sulfate were mixed homogenously and pelletized up to 10-15 mm in diameter. Pellets were reduced using a muffle furnace at 950 to 1150°C for 60 min. Reduced pellets were crushed into -200 mesh before separating the ferronickel and its impurities using a wet magnetic separation process. The result showed that the anthracite coal with 5% S produced concentrate containing 3.56% Ni with 95,97% recovery, which is higher than 2.68% S. The sulfur content in reductant could replace the addition of sulfur/sulfate as the additives in the selective reduction of lateritic nickel ore.
EFFECT OF LOW RANK COAL TEMPERATURE AND MOISTURE CONTENT ON SLOW PYROLYSIS PROCESS Slamet Handoko; Sapta Rianda; Nurhadi Nurhadi
Indonesian Mining Journal Vol 24, No 2 (2021): INDONESIAN MINING JOURNAL, Vol. 24 No. 2, October 2021
Publisher : Puslitbang tekMIRA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30556/imj.Vol24.No2.2021.1234

Abstract

The government of Indonesia has made policies to increase the added value of coal. It can be completed using technology of slow pyrolysis. This study aimed to increase the added value of coal by analyzing the effect of temperature and water content of the feed on slow pyrolysis products. Water content variation in the feed form of coal was 10.57 wt% and 16.86 wt%. Temperature variations in the slow pyrolysis process were 500, 600, 700, and 800 ºC. Result of this research showed that the low moisture content of coal produced more char in the slow pyrolysis process. Based on the variations of the used temperature, a higher temperature of pyrolysis produced fewer char but its calorific value of coal product was also higher. The optimum operating condition was achieved at 500-600 ºC.
STUDY ON CHEMICAL CHARACTERISTICS OF COAL AND BIOMASS BLEND AND THE TENDENCY OF ITS ASH DEPOSITION Datin Fatia Umar; Taty Rohayati
Indonesian Mining Journal Vol 24, No 2 (2021): INDONESIAN MINING JOURNAL, Vol. 24 No. 2, October 2021
Publisher : Puslitbang tekMIRA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30556/imj.Vol24.No2.2021.1242

Abstract

A coal and biomasses of empty fruit bunch (EFB), mesocarp fiber (MF) and palm kernel shell (PKS) were characterized in terms of its proximate, ultimate, calorific value and ash chemical composition. Ash fusion temperature (AFT) was carried out on coal and biomass blends with a composition in weight % of 95-5; 90-10 and 85-15. The coal used in this research has high calorific value of 6,106 cal/g. Results indicate that based on the AFT, the coal-biomass blends at some composition shows a medium tendency to ash deposition. While based on the chemical composition, generally the coal-biomass blends have a low tendency to slagging but have a high tendency to fouling. Coal-biomass blend at the coal composition of 85 wt% and PKS of 15 wt% (85-15) is recommended to be applied. The less the coal is used, the less the CO2 emission, so it is expected to reduce the GHG significantly.
Abstract Indext Tatang Wahyudi
Indonesian Mining Journal Vol 25, No 1 (2022): INDONESIAN MINING JOURNAL, Vol. 25 No. 1, April 2022
Publisher : Puslitbang tekMIRA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30556/imj.Vol25.No1.2022.1320

Abstract

BIO-ORGANO MINERAL EFFECT ON SOIL FERTILITY, NUTRIENT UPTAKE, AND SWEET CORN (Zea mays L. saccharata) GROWTH PLANTED IN INCEPTISOLS SOILS Restu Wulansari; Maryono Maryono; Didit Adi Darmawan; Faris Nur Fauzi Athallah; Fardian Khairul Hakim
Indonesian Mining Journal Vol 25, No 1 (2022): INDONESIAN MINING JOURNAL, Vol. 25 No. 1, April 2022
Publisher : Puslitbang tekMIRA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30556/imj.Vol25.No1.2022.1282

Abstract

Sweet corn (Zea mays L. saccharata) is a horticultural product widely consumed by Indonesian people because of its sweetness. Corn requires sufficient nutrients to grow and produce the optimal yield so that the fertilization is a determining factor in corn cultivation. Bio-organomineral fertilizer (BIOM) is a fertilizer that combines mineral, organic, and biological elements (microorganisms). This study aims to examine the effect of BIOM on growth of sweet corn, nutrient uptake, and soil fertility. Experimental design used in this research was Randomized Block Design (RBD) with nine treatments and three replications which consist of treatments control; 1 NPK; ½ BIOM; 1 BIOM; 1 NPK + ½ BIOM; 1 NPK + ¾BIOM; 1 NPK + 1 BIOM; ¾NPK + 1¼BIOM; and ¾NPK + 1½BIOM. Effect of BIOM fertilizer at 100% dosage significantly increased the plant height, stem diameter, and canopy diameter compared to the control. BIOM fertilizer had a significant effect on the N uptake, total N, P-potential, P-available, K-potential, and K- exchangeable. The fertilizer is able to provide positive results on the growth of sweet corn, so it’s more effective for the availability of nutrients needed by sweet corn plants.

Page 23 of 27 | Total Record : 264

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