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Request PDF | On Nov 1, 2023, Abdul Hapid and others published Oxidation of sulfide mineral and metal extraction analysis in the microwave-assisted roasting pretreatment of refractory gold ore ...
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The chemistry of sulfide roasting is complex involving numerous reactions. Roasting of sulfides, in general, is exothermic and hence the temperature of the ore lump remains high enough for the desired chemical reactions to occur fairly early during the roasting process. This chapter also attempts to demonstrate as to how the …
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Dead roasting for zinc sulfide, pyrite, and gold-bearing sulfide minerals Dead roasting is the most commonly used roasting process and is mainly applied in our zinc and pyrite roasters. When using a dead-roasting process for concentrates, the sulfides are completely transformed into oxides. The gas temperature
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Pyrolysis of gold sulfide concentrate with dispensed additives of water vapor and ammonium chloride has significant promise for application: for preparation …
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The leaching behaviors of gold and silver from a complex sulfide concentrate in copper-tartrate-thiosulfate solutions were investigated in this paper. Experimental parameters, including temperature, initial pulp pH, and concentration of copper, tartrate, and thiosulfate, were systematically studied. The copper-tartrate-thiosulfate leaching system …
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Semantic Scholar extracted view of "Fluidized roasting-stage leaching of a silver and gold bearing polymetallic sulfide concentrate" by Bin Xu et al. ... Consolidation in calcines is a common problem in the oxygen-enriched air roasting of refractory gold concentrates containing sulfur and carbon when the initial temperature is greater than …
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The process of fluidized roasting-stage leaching has been developed in this paper to extract silver and gold and their associated metals including copper, zinc and antimony from a complex polymetallic sulfide concentrate. Sintering of the concentrate with high Pb content might be avoided during fluidized bed roasting under appropriate …
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Where more than one metal sulfide is present in the concentrate, the reactions are truly complex and very large in number. The composition of a product in sulfide roasting depends not only on the chemical and mineralogical composition of the concentrate, temperature, and partial pressures of O 2, SO 2, and SO 3 but also on the …
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The SEM-EDS analyses of the leach residue showed that dissolution and decomposition of pyrite in the complex sulfide concentrate leave many vacant areas and microstructures, which can effectively …
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The polymetallic sulfide concentrate used in this study had particle sizes of 71% less than 44 μm. Its chemical and mineralogical compositions are shown in Table 1. The main valuable elements of this concentrate included Ag, Cu, Au, Sb, Zn and Pb. Mineralogical phases of the concentrate were determined by quantitative X-ray …
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Specifically, roasting oxidation is a widely utilized method in the pretreatment of sulfide gold ore, aiming to break down the compact sulfide inclusions …
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The nature of gold (Au) ore deposits plays an essential role in determining the best gold recovery method as an alternative to cyanidation, considering environmental concerns. Thiourea (Tu) leaching of gold is an alternative lixiviant for treating sulfide gold ores and concentrates. The present study investigated the leaching behavior of Au …
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Gold roasting is a process, applicable to refractory ores and concentrates that contain sulfide sulfur, organic carbon, and potentially arsenic. Removal of these compounds is necessary to achieve high gold recovery (>90%) during cyanide leaching. Gold roasting is typically a metallurgical fluidized bed process.
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The technique involves the agglomeration of calcium-based SO2 sorbent with the refractory ore or concentrate before roasting. The results of the LAR pretreatment followed by …
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Outotec can deliver the three main oxidative processes for the treatment of refractory gold concentrates – BIOX, pressure oxidation, and roasting – and …
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The content of exposed and semiexposed gold increased from 34.65% to 57.56%, which was beneficial to the gold leaching. In the vacuum roasting pretreatment process of carbonaceous gold concentrate ores, the effect of temperature was obvious, and the increase of temperature was conducive to the carbothermal reduction reactions …
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ROASTING OF SULFIDE MINERALS In addition to common metals like copper, lead, zinc, and nickel a number of other metals such as antimony, bismuth, cadmium, cobalt, mercury, and molybdenum occur as sulfide minerals. Sulfides are not reduced with the most widely used redu-cing agents, carbon and hydrogen, because the free energy change for the ...
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To achieve optimum gold recovery from the certain sulfide ore body, the ore must be finely ground to achieve proper oxidation and mineral separation. The ore is separated into stockpiles after it has been mined. These stockpiles are based on gold content, sulfide content, and carbonate content.
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Let's guess there are 4 cups in a pound, correct me if I am wrong, my kitchen skills are nonexistent. So 4 cups is one pound times 8 grams Gold per cup so 32 grams per pound of concentrate. Rounding the 32 down to 1 troy ounce you have a concentrate used in the video of 2000 oz per ton. That is a world of difference from 6 oz …
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A roasting process using electric furnaces and high-pressure oxidation has been used to decompose pyrites in Au concentrates. However, the roasting process is uneconomical and involves environmental problems ... M.G. Treatment of a refractory gold-copper sulfide concentrate by copper ammoniacal thiosulfate leaching. Miner. Eng. 2001, 14, 615–637.
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The effect of bio-oxidation and neutral atmospheric oxidation pre-treatment of refractory gold concentrates on gold and silver extraction during cyanidation was investigated. A series of pre-treatment experiments was conducted on three high sulfur (> 9%) refractory concentrates with 0.92–1.25 g/t gold and 64–90 g/t silver. Cyanidation …
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Under a roasting temperature of 1200 °C, a vacuum degree of 20 Pa, and roasting time of 30 min, the gold leaching rate of carbonaceous gold concentrates increased from 2.0% to 70.64%, no SO 2 was produced, and the problem of conventional roasting waste gas treatment was effectively solved. The leaching rate of gold …
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The gold ore must be pretreated to oxidize sulfide minerals associated with gold and to remove other minerals and chemical compounds that interfere in the …
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Pyrolysis of gold sulfide concentrate with dispensed additives of water vapor and ammonium chloride has significant promise for application: for preparation (breaking down gold sulfide concentrates) with additions of 2–3%, and during roasting before melting with additions of 20–25%.
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The gold recovery from the Sand Farming was comparable to POX and roasting. Roasting calcine yielded the gold extraction of 70% while gold extraction from POX residue showed about 90%. ... High grade whole ores or upgraded sulfide concentrates can be processed using POX or roasting processes but the high capital and operating …
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The resource utilization of cyanide tailings has significant environmental and economic benefits. The efficient recovery of gold from low-grade cyanide tailings containing 1.71 g/t Au was performed by a chlorination roasting–flotation process. The effects of roasting temperature, calcium chloride, internal coke, external coke, copper sulfide …
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Furthermore, the secondary encapsulation of gold during the roasting made it difficult to obtain nearly complete gold extraction. 3.2.3. ... As and Sb bearing sulfide gold concentrate by direct cyanidation and thiosulfate leaching only reached 8.1% and 10.3%, respectively. The primary reason for these low extractions was that the most of …
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The air roasting of concentrates that are refractory because of their high sulfide content has been successful because the process is exothermic at sulfide sulfur concentrations in excess of 15% owing to the heat released on oxidizing the sulfides. ... because the gold is locked within sulfide minerals and the carbonaceous matter …
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This research focused on procedures for recovering gold from sulfide refractory gold ore in a clean and efficient way through a sequential separation method. …
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Gold roasting is a process, applicable to refractory ores and concentrates that contain sulfide sulfur, organic carbon, and potentially arsenic. Removal of these compounds is necessary to achieve high gold recovery (>90%) during cyanide leaching. Gold roasting is typically a metallurgical fluidized bed process.
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