Temat: gold ore - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Pressure oxidation of pyrite-arsenopyrite refractory gold concentrate
Autorzy:: Rusanen, L.
Aromaa, J.
Forsen, O.
Powiązania:: https://bibliotekanauki.pl/articles/110051.pdf
Data publikacji:: 2013
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:: gold ore
hydrometallurgy
leaching
factorial design
Opis:: Refractory gold ores have poor gold recoveries with direct cyanide leaching. Typically the refractoriness is due to encapsulation of the gold particles inside the host mineral. To liberate gold for leaching the host mineral must be broken by mechanical or chemical means. The aim of this study was to study the effect of temperature, oxygen partial pressure and slurry density on pressure oxidation of pyrite-arsenopyrite gold concentrate. Batch oxidation tests in an autoclave were done using a factorial design. Different responses were measured and analysed to study effect of the three factors and oxidation kinet-ics. Generally, high slurry density required high temperature and oxygen partial pressure to reach com-plete oxidation. Oxidation kinetics at 225°C temperature, with 1050 kPa oxygen partial pressure and 15% slurry density was found to be fastest resulting in complete conversion of sulfides in 30 minutes. At 195°C, 700 kPa oxygen partial pressure and 10% slurry density, the oxidation kinetics for complete sul-fide conversion was about 60 minutes. Slurry densities above 10% had an adverse effect on the oxidation rate, when the temperature was below 225°C and oxygen partial pressure below 1050 kPa.
Źródło:: Physicochemical Problems of Mineral Processing; 2013, 49, 1; 101-109
1643-1049
2084-4735
Pojawia się w:: Physicochemical Problems of Mineral Processing
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Applicability of published experimental works as a knowledge source in recommendation of gold ore processing workflows
Autorzy:: Rintala, L.
Aromaa, J.
Forsen, O.
Powiązania:: https://bibliotekanauki.pl/articles/109780.pdf
Data publikacji:: 2015
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:: gold ore
leaching
case-based reasoning
process development
Opis:: The experimental work is the most time consuming and expensive part of the process design. A case-based reasoning (CBR) methodology can be used to assist in the process design. Auric Adviser is a CBR system under development for recommendation of gold ore processing workflows. In Auric Adviser the knowledge in gold ore processing is represented in two models. The first model holds the knowledge needed to recommend process chains already used in industry. The second knowledge model is intended to recommend the most efficient unit processes based on research results. The objective of this study was to analyse the information richness of journal articles and other publications concerning single process steps of gold extraction. The aim was to study the applicability of these publications as a source for the second Auric Adviser knowledge model. In this study, 25 publications concerning leaching of gold were analysed and information was extracted in a case base. The case base was taken as either a process or experimental description with clearly defined differences to other descriptions. In total, 218 cases that described results of gold leaching were extracted from the sources. The analysis of descriptions showed that the knowledge necessary for design the second Auric Adviser model can be elicited from journal articles and other publications concerning single process steps. The trends in the case description were that the gold content and process outcome were usually well described. Nevertheless, the information richness varied in descriptions of raw materials, experimental arrangements but the results were often missing details. The incompleteness of information causes challenges in the process comparison although it does not prevent the CBR system to work.
Źródło:: Physicochemical Problems of Mineral Processing; 2015, 51, 2; 707-717
1643-1049
2084-4735
Pojawia się w:: Physicochemical Problems of Mineral Processing
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Chloride–hypochlorite oxidation and leaching of refractory sulfide gold concentrate
Autorzy:: Hasab, M. G.
Rashchi, F.
Raygan, S.
Powiązania:: https://bibliotekanauki.pl/articles/110795.pdf
Data publikacji:: 2013
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:: refractory gold ore
oxidative pre–treatment
non–cyanide leaching
Opis:: In this research, oxidation of sulfide minerals and leaching of gold from a gold–bearing sulfide concentrate using chloride–hypochlorite solution was investigated. The effects of calcium hypochlorite concentration, sodium chloride concentration and initial pH of leachant on changes of the slurry pH and Eh were examined. Then, considering the stability range of the gold complex (Eh ~ 1000 mV) and for-mation of chlorine gas (pH < 3.5), the optimum leaching parameters were determined. The optimum conditions were obtained at 200 g/dm3 calcium hypochlorite, 200 g/dm3 sodium chloride and initial pH 11 (with 200 g/dm3 concentrate, stirring speed 600 rpm and temperature 25C) at which about 82% gold was extracted in 2 h.
Źródło:: Physicochemical Problems of Mineral Processing; 2013, 49, 1; 61-70
1643-1049
2084-4735
Pojawia się w:: Physicochemical Problems of Mineral Processing
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Ocena wzbogacalności flotacyjnej rudy złota
Assessment of the Gold Ore Floatability
Autorzy:: Krawczykowska, A.
Powiązania:: https://bibliotekanauki.pl/articles/318895.pdf
Data publikacji:: 2017
Wydawca:: Polskie Towarzystwo Przeróbki Kopalin
Tematy:: ruda złota
flotacja
wzbogacanie grawitacyjne
gold ore
flotation
gravity separation
Opis:: W artykule przedstawiono wyniki wzbogacania rudy złota. Do badań wykorzystano dwie próbki rudy, znacznie różniące się zawartością tego pierwiastka. Zostały one poddane operacjom przygotowawczym, polegającym głównie na głębokim rozdrobnieniu i klasyfikacji. Porównano wyniki wzbogacania flotacyjnego próbek w dwóch różnych układach wzbogacania: bezpośrednio po rozdrobnieniu oraz po wstępnym wzbogaceniu na stole koncentracyjnym. Flotacja okazała się efektywną metodą wzbogacania badanej rudy, uzyskane koncentraty cechują się wysokimi zawartościami złota, natomiast w odpadach pozostały śladowe jego ilości. Ponadto analiza wyników wykazała, że wprowadzenie wzbogacania grawitacyjnego przed procesem flotacji wpłynęło pozytywnie na jakość flotowanych koncentratów.
The article presents the results of gold ore beneficiation process. Two samples of ore, significantly differed in terms of gold content, were utilized for investigations. Samples were subjected the preparatory operations, consisting of fine comminution and classification. There were compared the results of flotational beneficiation obtained in two different processing circuits: directly after grinding and after pre-concentration operation with using the shaking table. The flotation operation has proven to be an effective method of concentration for this type of ore, the obtained concentrates were of a high gold grade, while the gold contents in tails were very low. In addition, the analysis of the results showed that application of gravity concentration prior to flotation process positively influenced the quality of flotation concentrates.
Źródło:: Inżynieria Mineralna; 2017, R. 18, nr 1, 1; 221-226
1640-4920
Pojawia się w:: Inżynieria Mineralna
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Gold leching from a Saudi ore by the nonpolluting thiosulfate process
Autorzy:: Mahmoud, M. H. H.
Awad, H. M.
Elhabib, O. A.
Powiązania:: https://bibliotekanauki.pl/articles/110379.pdf
Data publikacji:: 2015
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:: gold
extraction
leaching
thiosulfate
Saudi ore
Opis:: In all working Saudi gold mines, ores are treated using the hazardous cyanidation process. Some Saudi gold ores, such as Al-Amar, is known to be refractory to cyanidation. In this work, we have examined the extraction of gold from Al-Amar gold ore by the much environmentally safer and efficient thiosulfate process. The run of mine (ROM) and carbon-in-leach (CIL) feed, that is obtained after separation of copper concentrate from ROM, samples were found to contain 6.5 and 3.6 ppm gold, respectively. The mineralogical microscopic investigations of ROM samples confirmed that fine gold specks were scattered and encapsulated inside sulfide or quartz base minerals. This could explain the expected reason of the difficult leaching of gold by cyanidation. The X-ray diffraction analysis showed that the CIL feed contained quartz, pyrite, sphalerite and chlorite minerals. After detailed leaching studies of CIL feed, almost 70% of gold could be extracted at 0.2 M ammonium thiosulfate and 0.3 M ammonium hydroxide after 24 h. Addition of copper(II) as <0.2 mM only slightly enhanced the gold leaching in the ammoniacal thiosulfate solution. Gold leaching drastically decreased as the concentration of copper(II) increased 0.2 mM due to the degradation of S2O3²¯.
Źródło:: Physicochemical Problems of Mineral Processing; 2015, 51, 1; 59-72
1643-1049
2084-4735
Pojawia się w:: Physicochemical Problems of Mineral Processing
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Effects of lead nitrate and pre-aeration on the deportment of base/precious metals in cyanide leaching of a pyritic refractory gold concentrate
Autorzy:: Hacı, Deveci
Ersin, Yener Yazıcı
Oktay, Celep
Murat, Mercimek
Cumhur, Demirel
Serkan, Çakmak
Melih, Baki Cingöz
Ömer, Hami Kavlu
Hüseyin, Kömürcü
Powiązania:: https://bibliotekanauki.pl/articles/24085578.pdf
Data publikacji:: 2023
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:: gold
cyanide leaching
pyrite
copper
refractory ore
lead nitrate
Opis:: This study was undertaken to improve gold and silver extraction from a pyritic gold flotation concentrate, which assayed 11 g/t Au, 42 g/t Ag, 0.21% Cu, 3.57% Zn, and 31% Fe. Direct cyanide leaching of the concentrate at 1.5 g/L NaCN yielded a low gold extraction (37%), confirming its refractory nature. Effects of lead nitrate (200-500 g/t Pb(NO3)2) and pre-aeration (24 h) before cyanide leaching at 1.5-3.5 g/L NaCN were investigated. Earlier studies have focused on the impact of these parameters on gold leaching. Besides gold, this study demonstrated the behaviour of silver and base metals (copper and zinc) from the pyritic gold concentrate. Adding lead nitrate had a negligible effect on gold extraction whilst improving silver extraction. Dissolution of copper was substantially suppressed by adding lead nitrate, i.e., from 23% (no Pb(NO3)2) to 4% (500 g/t Pb(NO3)2) over 24 h. Zinc dissolution was negligible (≤0.01%). Pre-aeration of the concentrate improved the gold and silver extractions by 4-14% and 23-44% at the subsequent cyanide leaching (1.5-3.5 g/L NaCN). However, it did not affect the leaching of copper. Only negligible leaching of zinc (≤0.6%) occurred during cyanide leaching. Pre-aeration also reduced cyanide consumption in subsequent cyanide leaching (1.5 g/L NaCN), i.e., from 2.83 kg/t to 2.03 kg/t NaCN per solids. These results suggested that lead nitrate can improve silver extraction while suppressing copper dissolution, which would be advantageous in the leaching-adsorption circuit (CIP), mitigating the dissolved copper-associated problems. Pre-aeration can also be suitable for improved gold/silver extractions and reduced reagent consumption.
Źródło:: Physicochemical Problems of Mineral Processing; 2023, 59, 5; art. no. 166259
1643-1049
2084-4735
Pojawia się w:: Physicochemical Problems of Mineral Processing
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: The auriferous ore mineralisation and its zonal distribution around the Variscan Kłodzko–Złoty Stok granitoid pluton in the Sudetes (SW Poland) – an overview
Autorzy:: Mikulski, S. Z.
Speczik, S.
Powiązania:: https://bibliotekanauki.pl/articles/2059951.pdf
Data publikacji:: 2016
Wydawca:: Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:: gold
ore mineralisation
skarn
Variscan granitoids
Kłodzko–Złoty Stok pluton
Sudetes
Opis:: Due to a low level of erosion the Variscan (Carboniferous–Mississippian) Kłodzko–Złoty Stok (KZS) granitoid pluton and its metamorphic rock cover are unique examples of the ore mineralisation distribution pattern around a pluton. The KZS pluton formed from I-type magmas. It is composed mostly of high-K, metaluminous, biotite- and hornblende-rich granitoids of various compositions ranging from granodiorite to monzonite. The ore mineralisation in the KZS shows specific zonation that reflects interaction between post-magmatic mineralising fluids and country rocks of different composition. In the KZS pluton and its surroundings the mineralisation reveals high-temperature Ti-W oxides and As-Fe sulphide-arsenides plus Fe-oxides which are replaced outwards by Cu-Fe-Pb-Zn sulphides and subsequently, in the marginal parts of the pluton, by the Pb-Sb-Fe sulphide mineralisation. The specific elements and the isotopic composition of sulphur in ore minerals indicate that the metal-bearing postmagmatic-metamorphic hydrothermal fluids, despite their strong affinities to the KZS hybrid magmatic fluids, show also an influence of variable composition of country rocks. Variable alteration processes: hornfelsitisation, skarnisation, dolomitisation, serpentinitisation, pyroxenisation, biotitisation, K-feldspatisation, silicification, berezitisation, carbonatisation, prehinitisation, chloritisation, epidotisation, sericitisation, albitisation and sulphidisation developed along contacts of various rock types within the country rocks. In more fractured zones, transported elements were preferentially trapped by calcareous (Ca-rich) metamorphic rocks. Moreover, along the direct contact between granitoids and calcareous rocks a high temperature auriferous skarns with magnetite-pyrrhotite or/and löllingite-arsenopyrite mineralisation were formed. There are positive correlations between organic matter and Fe2O3 and MgO contents in skarns, suggesting remobilization of organic matter by hydrothermal fluids released during serpentinisation. The organic matter and carbonate samples have very variable δ13C and δ18O values. Most probably these are the result of isotopic re-equilibration between minerals under high temperatures. On the intimate contact of granitoids with less permeable amphibolitic hornfelses a high temperature titanite-scheelite mineralisation of veinlet-impregnation type occurred, while thermal and metasomatic alteration of the enveloping more permeable sandstones developed away from direct contact with granites, causing the formation of pyrite-rich beresites. As a rule, different types of sulphide ore mineralisation contain refractory gold captured by arsenopyrite, löllingite and/or pyrite. Moreover, the formation of contact-metasomatic ore mineralisation was accompanied by ore precipitation in veins and stockworks at a wide temperature range from 480 to 150°C during early and late fracturing stages. The younger stages also revealed variable concentration of gold. All those observations strongly indicate that the whole KZS pluton and its aureole was fertile in gold.
Źródło:: Geological Quarterly; 2016, 60, 3; 650--674
1641-7291
Pojawia się w:: Geological Quarterly
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: Increase in the Free Finely-Dispersed Gold Recovery in the Flotation Cycle
Autorzy:: Toktar, Gulmira
Bakrayeva, Akbota
Abdyldayev, Nurgali
Banks, Graig E.
Kubaizhanov, Alibek
Powiązania:: https://bibliotekanauki.pl/articles/2202319.pdf
Data publikacji:: 2023
Wydawca:: Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:: hydrometallurgy
ore
recovery
free finely dispersed gold
flotation
sulfidiser
pulp dispersion
Opis:: This article presents the results of a comparative study for the increase in the free finely dispersed gold recovery from the gold-bearing ore produced in a deposit in Kazakhstan. The following minerals were identified in the sample under X-ray phase analysis: chalcopyrite and pyrite, as well as in a finely disseminated state in silicate minerals. Gold in the ore is present mainly (40.09%) in the free form under the results of phase analysis. Flotation tests of ore beneficiation were performed in FML-1 and FML-3 flotation machines with chamber volumes of 1.0 and 3.0 liters. A flotation combined concentrate with a gold content of 15.3 g/t was obtained (concentrate yield 9.45%), with gold recovery into concentrate 82.79% in the optimal mode: the grind of 90% in the class -0.071 mm; consumption of reagents: C7 foaming agent – 30 and 60 g/t, sodium butyl xanthate – 60 and 120 g/t; the time of the main flotation – 10 minutes, the control flotation – 7 minutes, at pH = 9. Flotation tailings contained 0.33 g/t of gold. The recovery showed a fairly high 84.42% (yield of the total concentrate 20.93%) with the gold content of 7.1 g/t with the use of a sulfidizing agent (Na2S) and additional dispersion of the pulp at pH = 9.0. A gold-bearing concentrate was obtained containing 4.0 g/t Au at a fineness of -0.05 mm and 6.8 g/t Au at a fineness of +0.05 mm. The beneficiation of the pulp with a fineness of +0.05 mm gave the recovery into the final concentrate equal to 89.94%.
Źródło:: Journal of Ecological Engineering; 2023, 24, 1; 115--119
2299-8993
Pojawia się w:: Journal of Ecological Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: Szlachtowski obszar eksploatacji kruszców jako element projektowanego geoparku "Pieniny"
An exploitation area of Szlachtowa ore as an element of the future Pieniny Geopark
Autorzy:: Bartuś, T.
Kuś, T.
Powiązania:: https://bibliotekanauki.pl/articles/344507.pdf
Data publikacji:: 2010
Wydawca:: Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Stowarzyszenie Naukowe im. Stanisława Staszica
Tematy:: Szlachtowa
Pieniny
andezyt
sztolnia
kruszce
złoto
Pieniny Mts.
andesites
adit
ore
gold
Opis:: Jednym z najciekawszych obiektów projektowanego geoparku "Pieniny " będą sztolnie w Jarmucie i Potoku Pałkowskim. Ślady dziedzictwa górniczego szlachtowskiego rejonu eksploatacji kruszców cechują się wysokimi walorami naukowymi, historycznymi, edukacyjnymi i poznawczymi. Minerały kruszcowe eksploatowane w nich prawdopodobnie od XIV do XVIII w. związane są z występowaniem żył polimetalicznych i procesami hydrotermalnymi wokół intruzji andezytowych wschodniej części pienińskiej linii andezytowej (PAL). W historycznych kopalniach eksploatowano epitermalne, ubogie złoża złotonośne i srebronośne. Zagospodarowanie obiektów w ramach geoparku "Pieniny" może przyczynić się do rozładowania ruchu turystycznego w najpopularniejszych, zatłoczonych rejonach Pienin.
One of the most interesting objects of the future Pieniny geopark would be the Jarmuta and Patkowski stream adits. Traces of the mining heritage of an exploitation area of Szlachtowa ore are characterized by high scientific, historical, educational and cognitive values. The extraction of ore minerals which took place probably from XIV to XVIII century was connected with presence of polymetallic veins and hydrothermal processes around the andesite intrusions of the Eastern Polish part of the Pieniny Andesite Line (PAL). Historical mines exploited epithermal, poor gold-silver deposites. The land use within the Pieniny Geopark might contribute to reduction in tourist flows in the most popular and crowded parts of the Pieniny Mts.
Źródło:: Geoturystyka; 2010, 2; 35-58
1731-0830
Pojawia się w:: Geoturystyka
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: Założenia dla nowych projektów wierceń poszukiwawczo-badawczych rud metali w Polsce
Substantial principals of new ore metals prospecting-research drilling projects in Poland
Autorzy:: Mikulski, S.Z.
Speczik, S.
Powiązania:: https://bibliotekanauki.pl/articles/2063089.pdf
Data publikacji:: 2010
Wydawca:: Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:: złoto
miedź
molibden
cynk
wanad
złoża rud metali
wiercenia poszukiwawczo-badawcze
gold
copper
molybdenum
zinc
vanadium
metallic ore deposits
ore prospecting
Polska
Opis:: W 2006 r., w Państwowym Instytucie Geologicznym, w ramach zadań statutowych, przeprowadzono analizę prac geologicznych związanych z poszukiwaniem rud metali, w celu opracowania założeń projektu wierceń poszukiwawczo-badawczych dla rozwiązania najistotniejszych zagadnień surowcowych Polski. Zaprojektowanych zostało 20 wierceń poszukiwawczo-badawczych, o całkowitym metrażu ok. 9 tys. m, w tym 12 wierceń płytkich od 70 do 300 m oraz 8 głębokich wierceń od 600 do 1200 m. Opracowano wstępne projekty wierceń poszukiwawczo-badawczych rud: (1) Au w Sudetach i na bloku przedsudeckim, (2) Cu i/lub Au w utworach cechsztyńskich w Sudetach i na peryklinie Żar, (3) Mo–Cu typu porfirowego i (4) Zn–Pb typu MVT, w strefie kontaktu bloku małopolskiego z górnośląskim oraz (5) Ti–V w rejonie Ślęży na bloku przedsudeckim. Realizacja tych projektów wierceń pozwoli zweryfikować perspektywiczność w/w obszarów pod względem surowcowym, a w przypadku uzyskania pozytywnych rezultatów będzie miała podstawowe znaczenie dla dalszych prac poszukiwawczo-dokumentacyjnych. Ponadto umożliwi rozpoznanie budowy geologicznej w tym istotnych formacji rudonośnych.
On the base of Polish Geological Institute detailed analyses of archive geological materials the principals for new ore metals projects were established to solve important questions considering the future metal perspectives in Poland. Twenty location of the foreseen prospecting-research boreholes were selected of total length ca. 9 thousands meters. Among them 12 shallow boreholes from 70 to 300 m deep and 8 boreholes from 600 to 1200mdeep. The geological prospecting-research projects were prepared for the following perspective ores: (1) Auin Sudetes and on the Fore-Sudetic Block, (2) Cu and/orAuin Zechstein sediments in Sudetes and on the Żary Pericline, (3)Mo–Cuof porphyry type and (4) Zn–Pb of MVT type in the contact zone of Małopolska and Górnośląski Blocks (5) Ti–V in the Ślęża region on the Fore-Sudetic Block. The outcome of the considering drilling projects will have important meaning for increasing the perspective metal resources of the country. This project substantially develop recognition of the geological structure including important ore formation in Poland.
Źródło:: Biuletyn Państwowego Instytutu Geologicznego; 2010, 439 (2); 333--337
0867-6143
Pojawia się w:: Biuletyn Państwowego Instytutu Geologicznego
Dostawca treści:: Biblioteka Nauki

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