OPTIMASI TEKNIK FIRE ASSAY DAN KONDISI KUPELASI UNTUK MEMPEROLEH KOMPOSISI FLUKS TERBAIK PADA ANALISIS KADAR EMAS
DOI:
https://doi.org/10.33332/jgsm.geologi.v15i1.70Abstract
Pencarian terhadap emas tidak ada habisnya, bahkan sejak 4000 SM bahan ini sudah digolongkan sebagai logam mulia. Karena keberadaan emas di alam berada dalam keadaan heterogen dengan konsentrasi rendah, maka dibutuhkan teknik prakonsentrasi agar analisis kandungannya menjadi lebih tepat. Fire assay merupakan pilihan prakonsentrasi yang telah dikenal pada era Mesir maupun Romawi kuno. Teknik ini memang membutuhkan energi besar dan bahan campuran yang banyak walau ketepatan nilai analisisnya terbukti sangat baik. Optimasi metoda lead fire assay yang dipadukan dengan perangkat AAS pada pemeriksaan kadar emas terhadap contoh jenis pasir hitam telah dilakukan. Penelitian ini mendapatkan komposisi fluks terbaik menilik kepada jenis contoh tersebut untuk menghasilkan lead button tertinggi. Hasilnya menunjukkan bahwa reaksi fusi campuran fluks tercapai pada temperatur 1000 °C dengan pemanasan selama 60 menit. Optimasi energi dalam penjagaan kondisi furnace pada tahap kupelasi juga telah didapat dengan tingkat recovery mencapai 89,5%.
Kata kunci: emas, pasir hitam, fire assay, fluks, kupelasi
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Balaram, V., Mathur, R., Banakar, V.K., Hein, J.R., Rao, C.R.M., Rao, T.G., and Dasaram, B. 2006. Determination of The Platinum – Group Elements (PGE) and Gold (Au) in Manganese Nodule Reference Samples by Nickel Sulfide Fire-Assay and Te Coprecipitation with ICP-MS. Indian Journal of Marine Science.35(1): 7-16.
Beamish, F.E. and van Loon, J.C. 1977. Analys of Noble Metal. Academic Press, New York, Amerika Serikat
Caporali, S., Bellandi, S., Innocenti, M., Lopilato, O., Romualdi, L. and Pezzatini, G. 2010. Determination of Gold in Alloys via Potentiometric Titration; an Alternative to The Fire Assay. Gold Bulletin.42(2): 122-130.
De Neve, R. 1986. Analysis of Preciuos Metals Combining Classical Collection Procedure with Modern Instrumentation. 10th Annual IPMI Meeting, Lake Tahoe, Nevada, Amerika Serikat.
Haffty, J., Riley, L.B., and Goss, W.D. 1977. A Manual on Fire Assaying and Determination of The Noble Metals in Geological Materials. US Geological Survey Bulletin,1445 p.
Hansen, M.C.1995. Gold in Ohio. GeoFacts (9). Ohio Department of Natural Resources.
Hoffman, E.L., Clark, J.R. and Yeager, J.R. 1998. Gold Analysis – Fire Assaying and Alternative Methods. Explor. Mining Geol.7(1): 155-160.
Juvonen, R. and Vaananen, P.J. 1993. Determination of Gold in Geological Materials by Atomic Absorption after Lead Fire Assay Separation. Geological Survey of Finland, Report of Investigation:13-16.
Klemm, D., Klemm, R., and Murr, A. 2001. Gold of the Pharaohs – 6000 years of gold mining in Egypt and Nubia. African Earth Sciences.33: 643–659.
Kroner, A., Wilde, S.A., O'Brien, P.J., Li, J., Passchier, C.W., Walte, N.P. and Dunyi, L. 2005. Field Relationships, Geochemistry, Zircon Ages and Evolution of a Late Archaean to Palaeoproterozoic Lower Crustal Section in the Hengshan Terrain of Northern China. Acta Geologica Sinica.79 (5): 605-629.
Park, C.F., Jr. and R.A. MacDiarmid. 1975. Ore Deposits. San Francisco: W. H. Freeman & Company.
Petrovic, N., Budelan, D., Cokic, S. And Nesic, B. 2001. The determination of the content of gold and silver in geological samples. Journal of Serbian Chemical Society.66 (1): 45-52.
Raju, P.V.S. 2006. Comparison of Different Extraction Methods to Determine Gold in Geological Samples. Journal of Scientific & Industrial Research. 65: 65-67.
Randolph, N.G. 1993. Precious Metals. Pure & Applied Chemistry. 55 (12): 2411 – 2416.
Turan, A. and Yucel, O. 2011. The Effect of Iron and Oxidizing Fluks Addition on The Fire Assay of Low Grade Pyritic Refractory Gold Ores. Journal of Mining and Metalurgy, Section Base Metal.47(2): 219-227.
- , 2014, Black Beach Sand. http://www.ebay.com/bhp/black-beach-sand/ (diunduh 3 Februari, 2014).
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