Jurnal Puslitbang tekMira (Teknologi Mineral dan Batubara)
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BIOLEACHING OF LODAN QUARTZ USING Aspergillus ficuum
No full textDepending on its purity, quartz has a wide application in industry. Fungi play an important role in the quartz purification. A bioleaching study of Lodan quartz sample from Rembang, Central Java was conducted to obtain a suitable raw material for industrial applications. The microbial process using selected-indigenous fungus of Aspergillus ficuum in terms of removing iron, aluminum, and other unwanted metals within quartz. The result was then compared to the chemical leaching using pure citric and oxalic acids. The bioleaching process removed the iron (Fe2O3) from the initial content (0.78%) in the original sand sample to reach a level of 0.013% Almost 98.3% iron was removed. The bioleaching test also removed the aluminum, manganese, chrome, and titanium to a very low level within the 12-day process. The iron content in this treated quartz met the standards for optical and high-quality glass. On the other hand, the chemical leaching using pure citric and oxalic acids concentrations were equal to those that were produced by A. ficuum could only removed 70.5% of iron around 0.23% iron and 0,29 % aluminium were still remained in the sand. This fact suggested that the bioleaching method is more effective than the chemical one using the organic acids. The use of fungi to remove iron from quartz has the potential to be an effective method for upgrading the content and the commercial value of the quartz. The experimental results of this study have provided significant opportunity to use biotechnological approach for producing the quartz as a feed material for the high-quality glass industry
A GEOPHYSICAL PROSPECTING USING INDUCED POLARIZATION METHOD ON GOLD-BEARING SULFIDE DEPOSITS AT PASAWAHAN AREA, SIMPENAN SUB-DISTRICT, SUKABUMI DISTRICT, WEST JAVA
No full textInduced polarization (IP) is a geophysical imaging technique used to identify sulfidized sedimentary rocks in the form of quartz veins in Pasawahan, Sukabumi District,West Java. The voltage is then monitored through two other electrodes. The sulfide is a lense shape with resistivity of 1 – 10 W and induced polarization of 130 – 150 m sec. It is included in a 300,000-ton quartz vein
IMPROVING TAPIN KAOLIN QUALITY FOR WHITE WARE CERAMIC
No full textTapin kaolin cannot directly be utilized as raw material for white ware ceramics due to its high Fe2O3 content. It needs upgrading its quality in terms of fulfilling the specification of white ware ceramics. Such the material requires a series of process including washing, wet sieving in magnetic ferro-filter equipment and then dissolv- ing by H2SO4 10%. Based on several parameters such as Al2O3, SiO2 and Fe2O3 contents, 2-µm particle size density, whiteness and plasticity; Tapin kaolin quality develops significantly. XRD analysis shows that the mate- rial does not have maghemite anymore. Quartz is relatively low and mafic minerals are unavailable. Referring to such quality, Tapin kaolin can be used for Parian porcelain
UTILIZATION OF COAL GASIFICATION PRODUCER GAS FOR POWER GENERATION USING 10 KW SPARK IGNITION ENGINE
No full textCoal gasification is the process of converting coal into gas to ease its use and more environmentally friendly. Research and Development Center for Mineral and Coal Technology (tekMIRA) has been researching, designing, and developing a small-capacity gasifier with the brand of GasMin. This study discusses GasMin design and utilization for power generation using internal combustion engine type spark ignition engine. The result of laboratory analysis shows that the calorific value of producer gas was 1,013 kcal/Nm3, tar content was 4.04 mg/Nm3, particulate content was 11.17 mg/Nm3 and temperature of gas was 36oC. Based on characteristic of producer gas, it can be used for fuel in internal combustion engine. The internal combustion engine generator set (genset) used in this research was 10 kW spark ignition type. To be used for gas producer, some modifications were made on genset engine by replacing the function of the carburetor into mixing chamber for air and producer gas, and placed before mixing gas entering the combustion chamber.The results ofthis researchshow that the power generated was 4.8 kW, which was about 53% of maximum power on fuel. It isin accordance with the literature whichstates that de-rating of the genset engine ranges from 40-50%
EFFECT OF REAGENT VOLUME AND CONCENTRATION ON RECOVERIES OF MgO AND SO3 WITHIN SYNTHETIC DOLOMITE-BASED KIESERITE
No full textNatural kieserite is usually used for the production of epsom salt and fertilizer. Normally, the mineral is mined from geologic marine deposits and provides a soluble source of both Mg and S for plant nutrition. However, natural kieserite cannot be found in Indonesia. The fact that this country retains a lot of dolomite deposits and such a material can be processed into synthetic kieserite by sulphatization process seems promising for fertilizer industry in Indonesia. Varying the sulfuric acid concentration between 2 and 5 N and its volume from29.50 to 94.80 ml produces the MgO in MgSO4 filtrate below the specification as stated in Indonesian National Standard (14 – 19%) though its sulfur content has satisfied the requirements. It is assumed that some MgO’s (around 1.93 – 7.12%) are still available in CaSO4 deposit. To get the optimum results, an appropriate calcula- tion is required when adding sulfuric acid to the process and the solution should be in neutral condition prior to separating MgSO4 – CaSO4 as well
ANALYSIS OF TERM OF TRADE (TOT) FOR INDONESIA BAUXITE
No full textIndonesia does not have a processing unit for bauxite. As a result all raw materials are exported. In contrast, the alumina is imported to fulfill the domestic need for aluminum industry. In terms of evaluating bauxite export, term of trade (TOT) analysis was conducted. Method used to calculate the TOT is carried out using net barter of TOT formula. The parameter include the export price compared to the import one. If the bauxite price increases and the import price decreases, the TOT is surplus. Contrarily, if the export price decreases and the import price increases, the TOT is deficit. To calculate the ratio of the export volume against the import volume used the grass barter of TOT. The measured parameter is the export volume compared to the import one. If the export volume increases and the import decreases, the TOT is surplus. On the other hand, if the export volume decreases and the import volume increases, the TOT is deficit. In 2003, the net barter of TOT was 0.07 and the grass barter of TOT was 87,874, but in 2010, the net barter of TOT was 0.09 and the grass barter of TOT was 5,809.53. Results of the TOT values indicate that Indonesia was still the exporter of bauxite raw material with an average of export value was lower than that of the import one, although its volume was significant due to the very low price. Indonesian bauxite export value will increase, if the processing unit immediately establishe