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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 263 Documents

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TEST OF REMOVAL OF IRON MINERALS FROM KAOLIN USING HGMS Lili Tahli
Indonesian Mining Journal Vol 11, No 2 (2008): INDONESIAN MINING JOURNAL Vol. 11 No. 2 June 2008
Publisher : Puslitbang tekMIRA

Kaolin from Nagreg contains iron mineral particles approximately 0.58 % Fe that cause a grey color of the material . An effort to reduce iron content can be made by applying beneficiation test, using HGMS (High Gradient Magnetic Separator), so the kaolin may become white color and can reach the standard quality for paper industries. A HGMS beneficiation test was conducted at magnetic field strength of 5,000 Gauss. The experi- ments were carried out using variable flow rates of 1, 1.5, 2, 2.5, 3 and 3.5 liter per minute and slurry density of 2.5, 5, 7.5, 10, 12.5 and 15 % solid. The results of experiments show that the optimum condition with flow rate of 2.5 liters/minute gave the quality of kaolin concentrate with iron content of 0.29 %Fe.

THERMODYNAMIC SIMULATION AND VALIDATION EXPERIMENT OF NEODYMIUM OXIDE REDUCTION INTO METALLIC NEODYMIUM BY METALLOTHERMIC PROCESS Isyatun Rodliyah; Andina Septiarani; Hasudungan Erick Mamby; Zulfiadi Zulhan; Cristina Alberia Sitompul
Indonesian Mining Journal Vol 21, No 1 (2018): INDONESIAN MINING JOURNAL, Vol. 21 No. 1, April 2018
Publisher : Puslitbang tekMIRA

Neodymium (Nd) is one of the rare-earth elements (REEs) found in significant amount within monazite and bastnasite minerals. Nd is a ferromagnetic metal that is often used as a material to produce magnet, commonly known as a permanent magnet. Neodymium is alloyed with other metals such as iron and boron to form one of the strongest types of permanent magnet. This research aim is to study the reduction process of Nd-oxide into Nd-metal through the metallothermic process. The Nd metal product is expected to fulfill the material specification for a permanent magnet. Thermodynamics simulation of Nd reduction into its metal was conducted using ITB’s licensed Factsage software. A validation experiment was conducted only to the Nd metal resulting simulation. The simulations involved some parameters, i.e. temperatures (600, 700, 800, 900, 1000, 1100 and 1200 °C), types of fluxes (CaCl2and Ca(OH)2), composition of the reducing agent (1x, 2x dan 3x of the stoichiometric calculations), types of the reducing agents (Ca and Mg), and types of feeds used (Nd-oxide and Nd-chloride). The thermodynamic simulation shows that Nd metal was produced in a condition where the temperature should be1100-1200 °C using Ca as the reducing agent and CaCl2 as the flux, while the amount of reducing agent has no effect on the resulted product. Validation result of the simulations shows that the Nd metal is formed up to 49% metal in a non-oxidative condition.

THE EFFECT OF HYDROGEN PRESSURE ON THE PREPARATION OF ARTIFICIAL CAKING COAL FOR COKE BINDER NINING S. NINGRUM; Miftahul Huda; HERMANU PRIJONO
Indonesian Mining Journal Vol 14, No 2 (2011): INDONESIAN MINING JOURNAL Vol. 14 No. 2 June 2011
Publisher : Puslitbang tekMIRA

Binder of carbon compounds can be made through hydrogenation process and/or coal extraction. Hydroge- nation of coal converts the steam coal into caking one which functions as a binder or additive in the making of coke while the extraction of coal produces good quality pitch. Some coals from Tanito Harum, Baramarta and Bukit Asam were used as raw materials for binder making. Observations included effect of hydrogen pressure on the total carbon and ash contents and free swelling index as well. Coal hydrogenation was performed in a 5-litre batch type autoclave at reaction temperature of 400oC. The initial hydrogen pressure varies from 5 to 30 bars and to 1 hour reaction time. The next stage was the distillation of hydrogen product. It can be concluded that all non-caking coals used in the experiments can be converted into caking coal to be used as a binder in the coke making. The ash content within coal considerably affects the resulting binder product; binder that has low ash content is preferred.

STUDY OF BATCH SCALE-UP BENTONITE ACTIVATION USING SULFURIC ACID REZKY I. ANUGRAH
Indonesian Mining Journal Vol 15, No 2 (2012): INDONESIAN MINING JOURNAL Vol. 15 No. 2 June 2012
Publisher : Puslitbang tekMIRA

As a commodity for industrial applications, bentonite is needed in a large number of tonnages. Indonesia retains about 6 hundred million tons of bentonite resources, but its quality does not yet satisfy industrial spesifi cation. Most Indonesian bentonite is calcium-bentonite type. Therefore, it is necessary to activate the material to en- hance its absorption ability for decolorizing crude palm oil in cooking oil industries. This research was aimed to obtain the optimal bleaching power in order to decolorize the crude palm oil effectively. The batch scale bentonite activation used raw material from Sarimanggu, Tasikmalaya district, West Java. Since 40 %-solid gave a better average bleaching power value than that of 20 %, the activation was then focused at seeking the best condition with regards to the activition time (hour) and reagent dosages (sulfuric acid). The batch up scale of this research refered to the use of a 100-kg bentonite as the feed. The feed size was -10 mesh. The use of sulfuric acid was2.5 to 20 % (equivalent to 0.13 to 1.02 N) for 20 % solid and 2.5 to 15 % (equivalent to 0.34 to 2.04 N) for 40 % solid. A series of activation times was 1, 2, 3, 4, and 5 hours. It started when sulfuric acid has been depleted. Sampling was completed for each hour when a sample was neutralized until pH = 7. The sample was dried and the rest of bentonite slurry was fl owed into a dilution tank to be neutralized using water. Condition of 1-hour activation and 7.5 %-sulfuric acid (equivalent to 1.02 N) provided the best bleaching power value (88 %).

THE USE OF CYCLONE COAL BURNER TO SUBSTITUTE OIL BURNER IN ALUMINUM SMELTER USING REVERBERATORY FURNACE SUMARYONO SUMARYONO
Indonesian Mining Journal Vol 11, No 3 (2008): INDONESIAN MINING JOURNAL Vol. 11 No. 3 October 2008
Publisher : Puslitbang tekMIRA

The increasing of oil price forces the industries to alter their fuel from oil into a cheaper fuel. Undoubt- edly, coal is a promising energy alternative in Indonesia. To save the cost, altering the fuel oil into coal in industries may be accomplished just by altering the oil burner with coal burner, therefore the exist- ing equipment still can be used without much modification. The coal combustor employed should have nearly the same characteristic with the oil combustor, so that the performance of the kiln or other equipment served by the combustor is not change significantly. R & D Centre for Mineral and Coal Technology (TekMIRA) has developed cyclone combustor for coal with particle size of less than 30 mesh. The combustion is stable at the rate of 50 – 180 kg/hr coal with excess combustion air of 22 – 26%. The length of cyclones is ranged from 120 up to 220 cm, the internal diameter is 60 up to 80 cm and the combustion temperature is 1200 up to 1325°C. This combustor characteristics are nearly the same with oil combustor such as: the combustion flame may be directed; high intensity combustion, long flame; and it is not difficult to match the energy output of previous oil combustor. In this experiment the cyclone combustor was used to replace the oil combustor in a reverberatory furnace to refine aluminum from aluminum scrap by melting the material at 1000 – 1060°C. For 500 kg aluminum, the oil consumption was 47.5 litre for 2.5 hour or the average was 19 lt/hr and the energy efficiency was 29.2%. Using high ash bituminous coal with cyclone burner, the coal consumption was 129 kg for 1.8 hour or the average was 71.6 kg/hr and the energy efficiency was 17.9%. A higher efficiency was obtained by using low ash sub bituminous coal, that the coal consumption was 82 kg for 81 minutes or the average was 60 kg/hr and the energy efficiency was 29.0%. Therefore it is a good opportunity for coal to substitute fuel oil in this reverberatory furnace and many other oil fuelled processes such as in boiler, lime calcination, mineral drying etc.

MARBLE WASTE AND FLY ASH UTILIZATIONS FOR FINE CERAMIC RAW MATERIALS SUBARI SUBARI; SURIPTO SURIPTO
Indonesian Mining Journal Vol 13, No 2 (2010): INDONESIAN MINING JOURNAL Vol. 13 No. 2 June 2010
Publisher : Puslitbang tekMIRA

The possibility of using marble waste and fly ash taken from a textile industry as raw materials for producing fine ceramics was studied. Besides those two materials, clay was also used as the formed agent for ceramic body. There were four compositions noted as T1, T2, T3 and T4 that consist of marble waste 10 %, fly ash 10– 25 % and clay 65 – 80 %. They were formed by the method of slip casting.The tests pieces of these fine ceramic bodies were then fired at temperature of 600 °C. The glaze were applied to the bodies and further fired at temperature of 1150 °C in a gas kiln. Characterization results of those four composition tests show that the composition of T2 (70 % of clay, 10 % of marble waste and 20 % of fly ash) gives the best result.

MINERALIZATION OF THE SELECTED BASE METAL DEPOSITS IN THE BARISAN RANGE, SUMATERA, INDONESIA (CASE STUDY AT LOKOP, DAIRI, LATONG, TANJUNG BALIT AND TUBOH) Hamdan Z. Abidin; Harry Utoyo
Indonesian Mining Journal Vol 17, No 3 (2014): INDONESIAN MINING JOURNAL Vol. 17 No. 3 OCTOBER 2014
Publisher : Puslitbang tekMIRA

Three types of base metal occurrences discovered along the Barisan Range, Sumatera are skarn, sedex and hydrothermal styles. The skarn styles include Lokop, Latong and Tuboh, while Dairi and Tanjung Balit belong to sedex and hydrothermal deposits, respectively. The Lokop deposit is dominated by galena with minor pyrite and is hosted within interbedded meta-sandstone, slate, phyllite, hornfels and quartzite of the Kluet Forma- tion. The Skarn Latong deposit consists of galena with minor sphalerite and chalcopyrite with skarn minerals of magnetite, garnet and calcite. It is hosted within the meta-limestone of the Kuantan Formation. The Skarn Tuboh deposit is dominated by sphalerite with minor galena, pyrite, manganese, hematite and magnetite. It is hosted within interbedded meta-sandstone and meta-limestone of the Rawas Formation. The Dairi deposit belongs to the sedimentary exhalative (sedex) type. It is hosted within the sedimentary sequence of the Kluet Formation. Two ore types known are Julu and Jehe mineralization. The Julu mineralization referring to as sediment exhalative (sedex), was formed syngenetically with carbonaceous shale. Ore mineralogies consist of galena, sphalerite and pyrite. The deposit was formed within the temperature range of 236-375°C with salinity ranges from 9,3-23% wt.NaCl. The Jehe mineralization which belongs to the Mississippi Valley-Type, is hosted within dolostone of the Jehe Member. Ores comprise galena, sphalerite, pyrite, chalcopyrite, tetrahedrite and tenantite. The deposit was formed at temperature range from 193-400°C with salinity up to 38.2% wt.NaCl. The Tanjung Balit deposit belongs to the hydrothermal mineralization. The deposit is hosted within the sedimentary sequence of the Silungkang Formation. Ores consist of chalcopyrite, galena and sphalerite with minor gold and silver. Hydrothermal minerals such as silica, illite, montmorillonite, pyropilite, muskovite, siderite, diaspor, dickite, magnesite, chlorite, carbonate, rhodochrosite, analcime, alunite, smectite, ankrite, calcite, dolomite, sericite and zeolite are common found. The Tanjung Balit mineralization is formed at the temperature range from 185-350°C and belongs to meso-epithermal type.

OCCURRENCE OF PHILLIPSITE MINERAL IN SUB- SEAFLOOR OF ROO RISE-INDIAN OCEAN : A TECTONIC EROSION SYNTHESIS Dida Kusnida
Indonesian Mining Journal Vol 12, No 1 (2009): INDONESIAN MINING JOURNAL Vol. 12 No. 1 February 2009
Publisher : Puslitbang tekMIRA

A single deep-sea core (MD982156) of 30.30 meters long which is obtained during the MD III-IMAGES IV Expedition from Roo Rise - Indian Ocean in 1998 was studied. Down to 30 meters of the core length, the sediment consists of abundance planktonic foraminiferas. Below 30 meters, it is mostly composed of phillipsite mineral-rich sediment that is associated with nannoplanktons.The Paleocene authigenic phillipsite minerals associated with nannoplanktons is separated from Late Miocene to Holocene planktonic foraminiferas rich-sediments by hiatus. This hiatus or non deposi- tional in Roo Rise suggest be triggered by long Cenozoic tectonic erosion.

COASTAL AND SEAFLOOR SANDY AND GRAVELLY SEDIMENTS OF NORTHERN LOMBOK ISLAND AND ITS POTENTIAL AS CONSTRUCTION MATERIALS HANANTO KURNIO
Indonesian Mining Journal Vol 9, No 1 (2006): INDONESIAN MINING JOURNAL Vol. 09 No. 1 February 2006
Publisher : Puslitbang tekMIRA

Based on grain size analyses as well as microscopic and megascopic observations, coastal and seafloor sediments of northern Lombok Island are subdivided into 6 units : slightly gravely sand, slightly gravelly muddy sand, sand, gravelly sand, silty sand and slightly gravelly sandy mud. The slightly gravelly sand, sand and gravelly sand are of interest for its potentiality for construction material due to its widespread distribution and its low content of muddy and silty materials. Some offshore sediments are possibly landslide in origin as observed from factors such as steep seabottom slope of northern Lombok, graphic presentations of bimodal - polymodal histogram presentations as well as poorly sorted character of frequency curve diagrams and evidence from analog seismic record which demonstrates slumping of seabottom sediments.

EVALUATION OF IRON ORE FROM SOUTH KALIMANTAN AND TAILING OF PT. FREEPORT AS CATALYST PRECURSORS FOR DIRECT COAL LIQUEFACTION MIFTAHUL HUDA; HERMANU PRIJONO; NINING S. NINGRUM; SUGANAL SUGANAL
Indonesian Mining Journal Vol 13, No 1 (2010): INDONESIAN MINING JOURNAL Vol. 13 No. 1 February 2010
Publisher : Puslitbang tekMIRA

Research on catalyst derived from minerals for coal liquefaction reaction remains attractive since Indonesia has various kinds of minerals which are suitable to be used as catalyst precursors. In this research, iron ore from South Kalimantan and tailing of PT. Freeport were examined their activities to find the most suitable catalyst precursor for coal liquefaction reaction. Experiments were performed using a 0.5 litre batch type autoclave equipped with a horizontal shaking unit (54 times per minute) at reaction temperature, initial hydrogen pressure and reaction time of 400oC, 10 MPa and 1 hr, respectively. The result showed that tailing produced lower oil yield and coal conversion than those of iron ore. Tailing is suspected to experience slower hydrogen transfer rate during coal liquefaction since it produced larger pyrrhotite crystal size than that of iron ore.

Page 9 of 27 | Total Record : 263

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Home Page

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Abstract

Contact Name
Bachtiar Efendi

Contact Email
bachtaireaje@gmail.com

Phone
-

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

Editorial Address
-

Location
Kota bandung,

Jawa barat

INDONESIA