A fundamental study of the alkaline sulfide leaching of …
In the present paper, the alkaline sulfide system was studied as an alternative to cyanide for recovering gold from elemental sulfur. It was found that the dominant lixiviant for gold in this …
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Copper Mining and Extraction Sulfide Ores- Crusher …
The smelter for sulfide ores produces sulfur dioxide gas. This is scrubbed from the flue gases to make sulfuric acid for leaching copper from oxide ores. Scrubbing sulfur dioxide also protects the environment. For example: FeO(s) + SiO 2 (s)→ FeO.SiO 2 (slag) This is very similar to the removal of impurities in the blast furnace.
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A FUNDAMENTAL INVESTIGATION OF THE HIGH …
pressure within a gold operation to reach the highest percent recovery, no matter what kind of ore is presented for treatment. For double refractory gold ores, the most crucial unit operation is performed by the roaster by creating a high temperature oxidation of the ore. An efficient roasting operation creates a
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Gold Ore Roasting Techniques
A more recent paper, "Roasting of Arsenical Gold Ores and Concentrates" by F. R. Archibald contains a bibliography listing 23 references on the subject of roasting gold and silver ores. There are four general types of roasting furnace in use: the horizontal, multiple-spindle type, of which the Edwards furnace and modifications of it are ...
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Recovery of gold from sulfide refractory gold ore: Oxidation …
Recovering gold from sulfide refractory gold ore has been an important guarantee for the sustainable development of gold industry, while there are many challenges in the …
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Copper Ore Types: Sulfides vs. Oxides
Types of copper ore: Oxides. As mentioned, copper oxide ores are not as attractive an exploration target as copper sulfide ores due to their lower grade. However, in some cases low-grade copper oxide ores can still be economically mined because they can be processed at a lower cost than copper sulfide ores. Oxidized copper orebodies may be
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Smelting Sulfide Gold Ores
A conventional flotation-smelting process has been proposed to recover the platinum group metal (PGM) values from the sulfide ores. With the development of a low temperature roasting, acidic bromine leaching process by The Minerals Laboratory of BHP Minerals, substantial PGM recoveries from oxide and mixed oxide/sulfide ores are now possible.
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Mixed Copper and Gold Ore Concentrates …
Sulfide ores are usually processed using pyrometallurgy, while oxide ores are usually processed using hydrometallurgy. Gold ores can occur alongside copper ores, as some gold deposits are ...
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Optimization of microwave-assisted roasting: Box-behnken …
Resources of high-grade gold ore that is easy to mine and process have declined rapidly [[4], [5], [6], [7]].In recent years, there has been a decline in gold ore grades in relatively shallow mines [8].Therefore, finding high-grade gold ore deposits has become difficult [9].The mining industry is gradually turning its attention to RGO due to the decline in high-grade ore reserves [10, 11].
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A Brief Introduction to Copper Oxide Ores | Fote Machinery
Brochantite type copper oxide ore. Brochantite type copper oxide ore is dominated by copper alum minerals. It is a middle-difficult-to-beneficiate copper oxide ore. Flotation and chemical beneficiation can be used to recover copper. And the combined method shall be used if the gangue mineral is carbonate. Native copper oxide ore
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Types of Copper Deposits in the World | INN
Iron oxide-copper-gold (IOCG) deposits are highly valuable concentrations of copper, gold and uranium ores. ... Sulfide ores are processed via froth floatation to obtain copper concentrate. Copper ...
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The effect of sulfide minerals on the leaching of gold in …
The oxidation of gold and some sulfide minerals in solutions containing 5 mmol L − 1 cyanide and 50 mmol L − 1 sodium perchlorate as background electrolyte was studied using linear sweep voltammetry, and the polarization curves are shown in Fig. 1.It can be seen that gold oxidation commences at − 620 mV and approaches a diffusion limited current of 15 A m …
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Copper Oxide Flotation
Oxflo's selectivity for Gold/Silver is also shown by the "red" points. ... (the so called "mixed sulfide-oxide" ores) and, consequently, not treated by leaching-SX (the latter is widely practiced on low-grade ores from the "oxide …
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The leaching kinetics of an oxide gold ore with iodide/iodine …
Highlights Two gold ores were subjected to iodide/iodine leaching. The carbonaceous ore showed only 20% gold extraction. Gold extraction from the oxide ore reached 89% in 24 h. A power law rate equation was applied to model the gold extraction kinetics. Gold leaching rate was first order with respect to tri-iodide concentration.
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Establishing thE ProcEss MinEralogy of gold orEs
Some epithermal deposits may be free-milling (such as the oxidized portion) but more commonly contain significant amounts of sulfides in which gold occurs as tiny inclusions or …
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A fresh approach to sulfide ores
T he copper mining industry is reaching a turning point. Surface oxide deposits are depleting and copper miners are turning their attention to untapped sulfide ores found deeper underground. However, sulfides require …
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A fundamental study of the alkaline sulfide leaching …
chalcopyrite. These ores are often refractory, as the gold is encapsulated within the sulfide matrix. In order to recover the gold, the host matrix must be destroyed. Over the past 100 years, roasting or smelting has been the dominant method for oxidising sulfide bearing gold ores and concentrates. However, with the cost associated with treating SO
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Leaching of an oxide gold ore with chloride/hypochlorite …
An oxide gold ore was subjected to chloride/hypochlorite leaching at room temperature. The effects of three factors, including Ca(OCl) 2 vs. NaOCl, OCl − concentration, and HCl concentration on gold leaching performance were investigated. Due to formation of CaOCl + complex in solution and hence less reactivity, calcium hypochlorite produces a …
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Comparative investigations on sulfidic gold ore processing: …
Microbial enhanced sulfide oxidation is one of the alternatives to roasting or pressure oxidation (POX). High grade whole ores or upgraded sulfide concentrates can be processed using POX or roasting processes but the high capital and operating costs often prohibit to process lower grade materials using these process methods.
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A Review of the Cyanidation Treatment of Copper-Gold Ores …
Globally, copper, silver, and gold orebody grades have been dropping, and the mineralogy surrounding them has become more diversified and complex. The cyanidation process for gold production has remained dominant for over 130 years because of its selectivity and feasibility in the mining industry. For this reason, the industry has been adjusting its methods …
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Fire Assay Flux & Litharge Composition
In some highly basic oxidised ores as much as 3 grams of charcoal powder is required for 1 A.T, of ore, as the oxide must always be completely reduced to FeO, but generally from 1 to 1½ grams is enough. If there is much Fe2O3 in the ore (e.g., roasted pyrites) the slag is often rich, 3 or 4 per cent, of the gold being lost.
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Why are the sulfide ores generally converted to an oxide …
The concentrated ore must be converted into a form which is suitable for reduction. Usually the sulphide ore is converted to oxide before reduction. Oxides are easier to reduce. Thus isolation of metals from concentrated ore involves two major steps viz., (a) conversion to oxide, and (b) reduction of the oxide to metal.
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sulfide oxide ore and coal mineral processing
Konik Kırıcı Satın Al. sulfide vs oxide gold ores flotation in mining copper and gold oxide ore Jun 20, 2018 Copper processing is a complicated process that begins with mining of the ore The most common types of ore, copper oxide and copper sulfide, undergo two purify copper from copper sulfide ores, in four basic steps 1 froth flotation, are collected and may be refined to …
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Oxidative pretreatment of refractory gold ore using …
The pretreatment of refractory gold ore is a complex chemical process. In addition to the oxidation of pyrite, some side reactions also occur. The phase changes of refractory gold ore before and after pretreatment are shown in Fig. 11. The main phases of refractory gold ore include quartz (SiO 2), pyrite (FeS 2), and dolomite (CaMg(CO 3) 2 ...
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Supergene Oxidized Gold-Silver Deposits in the Americas: …
Oxidation can make sulfide-bearing gold-silver deposits economic by converting refractory gold-silver–bearing sulfide minerals to minerals that can be leached by dilute cyanide solutions. The use of cyanide heap leaching or tank leaching enabled open-pit mining of low-grade oxidized gold deposits starting in the 1960s.
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A Pretreatment of Refractory Gold Ores Containing Sulfide …
The use of thiosulfate to extract gold from refractory ores is promising because of its non-toxicity and high selectivity. Sulfide minerals (i.e., pyrite, arsenopyrite, chalcopyrite), major gold carriers in refractory gold ores, however, hinder gold extraction due to the high consumption of a lixiviant. In this study, a new method to improve gold extraction from sulfide …
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Development and optimization of mixed sulphide/oxide …
sulphide/oxide copper-gold vein deposit. Until June 2009, the sulphide and oxide minerals were respectively recovered by the well established xanthate flotation of sulphides and acid leaching of soluble oxide copper. The mixed (transitional) sulphide/oxide ores were stockpiled in the absence of an economic processing route due to their poor ...
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Sulfide And Oxide Gold Ore
Midnight Sun Discovers "Ore Shale" Type Copper Cobalt Nickel. Midnight Sun Discovers "Ore Shale" Type Copper Cobalt Nickel Gold All holes encountered shale units with base metal sulfide Oxide and 71 0 88 8 17
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Nickel Sulfide Versus Laterite : The Hard Sustainability …
Nickel is commonly present in two principal ore types – sulfide or laterite ores. Sulfide ores are typically derived from volcanic or hydrothermal processes and usually include copper (Cu) and/or cobalt, and sometimes other precious metals such as gold or platinum and palladium (generally grouped as platinum group metals or PGMs).
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Recovery of platinum group metals from oxide ores—TML Process …
A conventional flotation-smelting process has been proposed to recover the platinum group metal (PGM) values from the sulfide ores. With the development of a low temperature roasting, acidic bromine leaching process by The Minerals Laboratory of BHP Minerals, substantial PGM recoveries from oxide and mixed oxide/sulfide ores are now possible.
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