Institut za rudarstvo i metalurgiju Bor

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Table 2. Degrees of metal leaching with water from concentrate after sulphatization Element Leaching degree, % Cu 96.7 Fe 98.3 Ag 0.2 In the first phase of leaching, the zinc, copper and iron are removed from concentrate. The second phase is presented by the cyanide leaching for the aim of silver transfer into solution. Cyanide Leaching of Silver Laboratory investigations for cyanide leaching experiments on samples were carried out on the sulphatization process products after the recovery of copper, zinc and iron. Leaching parameters are: • Temperature: 25 o C • S:L ratio: 1:2 • NaCN concentration: 0.15% • Stiring rate: 800 min -1 • Oxidant: oxygen • Leaching time: 8 h • NaOH concentration: 0.03% • pH: 10 - 11 The result of cyanide leaching test, obtained after 8 h of leaching, was 71.8 % Ag. Silver Leaching with Thiourea Directly from Concentrate The test of untreated concentrate leaching was carried out with thiourea as the reagent. The main advantage of this reagent is that it eliminates the pre-treatment concentrate processes of roasting and leaching. The economic effect is also achieved since leaching is the process with small power consumption (at temperature of 40 o C). A sample of 100 g of sulphide concentrate was treated with thioruea solution and addition of oxidizer at temperature of 40 o C. The results are shown in Table 3. Table 3. Metals leaching degree Element Leaching degree, % Ag 47.40 Zn 2.76 Fe 14.01 Pb 0.008 Cu 1.16 This preliminary test has shown that the silver leaching from untreated concentrate is possible. The following investigation will be aimed to the defining of optimal technological leaching parameters. CONCLUSION Based on the obtained experimental results of investigation the silver leaching from sulphide concentrate from the »Rudnik« mine, it could be concluded the following: 1. Low temperature sulphatization of concentrate leads to the destruction of present metal sulphides 2. Leaching degree of non-ferrous metals (copper, iron and zinc) over 95 % was obtained by leaching of sulphatization products with water 3. Silver leaching degree of 71.8 % was obtained by cyanide leaching of silver in the presence of oxidant 4. Silver leaching degree of 47.4 % was obtained by direct leaching of silver with thiourea from concentrate. Acknowledgements The authors are grateful to the Ministry of Science and Technological Development for financial support (Project TR : 19002) No 1,2010. 87 MINING ENGINEERING
REFERENCES [1] G. Hilson, A. Monhemius, Journal of Cleaner Production, vol. 14, 2006, 1158-1167. [2] N. Geoffroy, F. Cardarelli, JOM, Avgust 2005, 47-50. [3] Lorenzen, L.; Van Deventer, J.S.J. Mechanism of leaching of gold from refractory ores, Minerals Engineering'92, n. 5, 1992, p. 1377, [4] M. Almeida, Materials Research, 2001, vol. 4, n. 4, 305-314. [5] Lorenzen, L.; Van Deventer, J.S.J. Mineralogical identification of refractory gold ores by means of the selective decomposition of minerals, Proceedings of the International Conference on Extractive Metallurgy of Gold and Base Metals, 1992, p. 171, [6] Zhang, Y. Z. Evaluation of thiourea consumption for gold extraction from complex and refractory gold ores, Proceedings of the 1996, 125 th TMS Annual Meeting, 1996, p. 443. No 1,2010. 88 MINING ENGINEERING
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INSTITUT ZA RUDARSTVO I METALURGIJU
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KOMITET ZA PODZEMNU EKSPLOATACIJU Y
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Analizirajući ovaj način uzorkova
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SADRŽINA UPROŠĆENOG RUDARSKOG PR
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COMMITTEE OF UNDERGROUND EXPLOITATI
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area is constantly increased. Figur
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CONTENT OF THE SIMPLIFIED MINING PR
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U morfološkom smislu, teren predst
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Rezultati terenski istraživanja i
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In morphological terms, the terrain
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GEO-MECHANICAL FEATURES OF THE TERR
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Sl. 3. Smičući naponi u konstrukc
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Na modelu bojom su razgraničeni od
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Figure 3. Shear stresses in collect
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Dumped material and collector eleme
Page 40 and 41: KOMITET ZA PODZEMNU EKSPLOATACIJU Y
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Page 68 and 69: Where is: Δ - volumetric density o
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da zaštiti podzemne vode od kontam
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• Otpadne vode od samog postrojen
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Practically, the “in-situ” expl
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• Waste water created during the
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geotektonska zona prema severoistok
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Osmatrani režim izdašnosti i temp
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Sl. 4. Kružni dijagram hemijskog s
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15. Nikl (Ni) 0,012±0,00500 UP-919
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alneoterapijskih i sportsko-rekreat
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phase are presented by andesite bas
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Figure 1. Hydro-geology maps of the
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Spring 2 Figure 3. Circle diagram o
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12. Lead (Pb)
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ecreational activities. The beginni
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UTICAJ GRANULOMETRIJSKOG SASTAVA ML
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SADR@AJ CONTENS D. Sokolović, D. E
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Institut za rudarstvo i metalurgiju Bor

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