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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 5 Documents
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Search results for , issue "Vol 9 No 1 (2006): INDONESIAN MINING JOURNAL Vol. 09 No. 1 February 2006" : 5 Documents clear
STIRRING AND NON-STIRRING METHODS USED TO MAKE SYNTHETIC DOLOMITE-BASED EPSOM SALT TATANG WAHYUDI; BUDHY AGUNG
Indonesian Mining Journal Vol 9 No 1 (2006): INDONESIAN MINING JOURNAL Vol. 09 No. 1 February 2006
Publisher : Balai Besar Pengujian Mineral dan Batubara tekMIRA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30556/imj.Vol9.No1.2006.654

Abstract

The increasing need of magnesium sulfate heptahidrat by various industries and the limited availabil- ity of this material in nature are two reasons to produce MgSO4.7H2O synthetically. Basically, such a material can be produced from dolomite. A laboratory scale of dolomite-based epsomite making which employed two crystallization processes was conducted. Those were stirring and non-stirring methods and the results showed that stirring one yielded 98.2312 to 98.7244 % MgSO4.7H2O salt. The non-stirring method produced salts of 97.5929 – 99.0378%. Yet prior to salt processing, magne- sium sulfate solution was evaporated at 100 – 110°C to get solution densities around 1.35, 1.38 and1.4 g/ml. The bigger the density the bigger the MgO and SO3 contents
DEALCALIZATION OF SOUTHERN CIANJUR BENTONITE USING AMMONIUM HYDROXIDE AND CITRIC ACID YUHELDA YUHELDA
Indonesian Mining Journal Vol 9 No 1 (2006): INDONESIAN MINING JOURNAL Vol. 09 No. 1 February 2006
Publisher : Balai Besar Pengujian Mineral dan Batubara tekMIRA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30556/imj.Vol9.No1.2006.656

Abstract

Dealcalization of southern Cianjur bentonite has been done to improve bentonite quality by reducing the alkali element (Na and Ca) content as impurities. The experiment used ammonium hydroxide and citric acid. The reaction parameters such as particle size, solution concentration, percent solid, time and contact temperature were optimized. Results of dealcalization using ammonium hydroxide ob- tained the optimum condition at particle size of -200+325 mesh, concentration of 4 N, percent solid of 10%, contact time of 36 hours and temperature of 100oC with recovery as much as 32.55% for Na and 29.14% for Ca. Meanwhile, dealcalization using citric acid, got optimum condition at particle size of - 325 mesh, concentration of 2N, percent solid of 10%, contact time of 24 hours, temperature of 100oC with recovery as much as 33.01% for Na and 30.07% for Ca. The results also showed that both solutions gave better recovery for Na rather than for Ca. In conclusion, experiment using citric acid was better than using ammonium hydroxide as demonstrated by its higher recovery of alkali elements. However, results of this work have not met the standards of bentonite for catalyst hydrocarbon crac- king.
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 : Balai Besar Pengujian Mineral dan Batubara tekMIRA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30556/imj.Vol9.No1.2006.657

Abstract

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.
STUDY OF POISON GAS OCCURRENCE AND WATER QUALITY WITHIN BAUXITE-CARRYING BARGE AT KIJANG ISLAND AHMAD FUAD AZMI TANJUNG
Indonesian Mining Journal Vol 9 No 1 (2006): INDONESIAN MINING JOURNAL Vol. 09 No. 1 February 2006
Publisher : Balai Besar Pengujian Mineral dan Batubara tekMIRA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30556/imj.Vol9.No1.2006.658

Abstract

An accident occurred in bauxite-carrying barge at Kijang Island that caused the death of 3 workers urged Mining Business Unit for Bauxite of PT Aneka Tambang to ask RDCMCT to conduct a series research on the barge. Observation on the site sampled gas and water. Results presented that NO2, SO2 and CO contents were still the threshold value as stated in a circular of Minister of Manpower no. SE.01/MEN/1997. Seawater analyses showed that all elements were still below the allowed figures except for nitrogen-ammonia (N-NH3) that exceeded the threshold value (0.213-0.47 mg/l). Based on observation on the site and laboratory analyses, oxygen deficiency within compartment was the caused of the worker death.
INDOOR AIR POLLUTION FROM BRIQUETTE-BURNING STOVES SELINAWATI T.D. SELINAWATI; Retno damayanti; HERNI KHAERUNISA
Indonesian Mining Journal Vol 9 No 1 (2006): INDONESIAN MINING JOURNAL Vol. 09 No. 1 February 2006
Publisher : Balai Besar Pengujian Mineral dan Batubara tekMIRA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30556/imj.Vol9.No1.2006.659

Abstract

Recently, the use of coal briquette has already been socialized to substitute the role of oil and firewood in the household and small industries. In general the use of coal briquette burning stoves for household and small industries purposes is often conducted indoors, with inadequate ventilation. Yet knowledge of emissions from coal briquette burning stoves and how to evaluate emission and expo- sure levels are very limited and need to be developed. Study of indoor air pollution was undertaken to evaluate SO2, CO and NOx concentrations and its exposure potentials coming from the utilization of coal briquette for household and small industries purposes. Its results were compared to the charcoal burning process. To estimate the indoor concentration and exposure potential, the single-compart- ment mass balance model was used. Results show that the total amounts of hourly emitted SO2, CO and NOx for 1 kg coal briquette burning vary from 5.32-14.71 mg kg-1; 2.76-12.54 mg kg-1 and 112- 288 mg kg-1, respectively. While those emitted from charcoal burning are 0 mg kg-1, 6.79 mg kg-1 and 201 mg kg-1. The air exchange rate gives an effect to concentration level, peak indoor concentration and duration after the burning process. The hourly average concentrations of SO2, CO and NOx in the unventilated room are 22, 42 and 10 times, respectively higher than the used standards. While for charcoal burning, those were 0, 17 and 6 times, respectively.

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