Dalam rangka. evaluasi tunpukan terak II yang terda.pat di daerah Peleburan, T:irnah Indonesia Mentok (PELTlM) atas dasar kandungan Tantalum (Ta), Niobium (Nb), Tungsten (W) dan Timah (Sn), maka dari turrpukan terak II tersebut telah diarnbil conto-conto dengan cara. pent>oran (menakai Bor Bangka) •Kegiatan pengambilan_conto-conto …
The discovery of the- negative belt of gravity anomalies along the trenches in Indonesia by Vening Meinesz has awakened geologists and geophysicists to developing ideas of,the formation of island arc systems and mountain building processes. The modern tectonics which is still, according to the author, a hypothesis should be proved, although s~e g…
laporan ini merupakan risalah risalah hasil hasil kerja bagian Proyek Be.him Galian Industri. Proy-ek pemetaan dan penyelidiken mineral di Daerah dalam tab 1972 - 1973. Dalam periode in1 telah dilalcukan Penyelidikan penyelidikan pendahuluan/eksplorasi pendahuluan terhadap endapan endapan bentonit, P…
Indonesia merupakan negara vulkanik•atau daerah gunung api yang termasuk pad.a busur da1am (inner are). Busur dalam ini terdiri dari gugusan pulau pulau gunungapi baik yang ma• sih aktif maupun yang sud.ah nonaktif. Pu.1au pulau ini melipu ti pulau Sumatera, Jawa, Bali, Lombok, Sumbawa, Flores, Alor Wetar dan Sulawesi bagian barat dan u…
A method i:. described for the preparation of trace element reference materials by a co-precipitated gel technique. The technique is applied to the manu- facture of multi-element calibration standards for the analysis of geological materials by direct-reading emission spectrome…
Hydrocracking is probably the most versatile of modern petroleum processes. This versatility has been achieved by the development of specific families of catalysts, of processing schemes designed to allow these catalysts to function efficiently and optimal refining relationships between hydrocraking and other refining processes.
The processing of concentrates of ilmenite and titanomagnetite in an induction-coupled plasma torch is decribed. A mixture of FeO and TiO2 was produced from ilmenite and a mixture of FeO, TiO2 and Fe2O3 from titanomagnetite. The result indicate that plasma proccesing of these minerals may be useful in indutrial applcations.
Interference effects in the determination of trace elements by atomatic-absorption spectrophotometry in applied geochemistry have been studied by a statistical appraisal and described in terms of a simple two-parameter mathematical model. The experimental design incorporated features that would allow possible deviations from the model to be detected…
Interpretation of regional geochemical survey data requires consideration of the effects of bedrock geochemistry, weathering and other secondary factors tending to modify the bedrock-soil-stream sediment relationship. Visual interpretation of complex multielement data may only serve to recognize the obvious
The expanding world fertilizer demand for phosphate rocks as .a primary source of phosphate fertilizers and the conti nuous utilization of the high-grade ores have stimulated efforts to beneficiate low-grade ores to minimize the impurities in phosphate concentrates for chemical processing. The basic neficiation technology of phosphate rock processin…