Sulphide Leaching
Mixtures of hypochlorous and hydrochloric acid (the former a very powerful oxidizing agent) help leach sulphide ores, the overall reaction being: MS + Cl(aq) ^ MCl2 (aq) + S The technique can be used …
ore leaching sulfide
Efficient Acid Leaching of Low Carbonate Copper Oxide Ore: …
Harichandan and Mandre 13 used sulfuric acid with concentrations of 1 M and 3 M for the leaching of a mixed oxide-sulfide copper ore containing 67.19% SiO 2 and considered the concentration of 1 M as the optimal acid concentration. They concluded that the leaching efficiency increased with increasing the leaching time to 120 min, and it …
Direct Leaching of sulfides: Chemistry and applications
The sulfide minerals associated with copper, nickel, zinc, lead, and molybdenum concentrates are described according to their thermodynamic stability zones on Eh-pH diagrams. From these zones, the chemistry associated with various thermodynamically feasible decomposition paths is discussed, and process developments associated with …
EXTRACTING METALS FROM SULFIDE ORES
Since the sulfide ore-body is conducting, the anodic and cathodic processes can occur at different places. Thus, ore-bodies, when exposed to weathering processes, develop a zonal arrangement of different mineral associations, which reflect different degrees of oxidation. ... Effective bacteria in sulfide leaching include Thiobacillus ...
In-place leaching of primary sulfide ores: Laboratory …
The leaching mechanism involves mixed kinetics and includes a surface reaction within a moving reaction zone plus pore diffusion of dissolved oxygen through the reacted …
Metals Extraction from Sulfide Ores with Microorganisms: …
Metal recovery from metal sulfide ore is carried out by chemolithotrophic bacteria like Acidithiobacillus ferrooxidans and Acidithiobacillus thiooxidans. The same is done by heterotrophic microorganisms in non-sulfide ores. ... Such agents can decrease the recalcitrant behavior of sulfide ores for leaching the metals and improve dissolution ...
Acid leaching of oxide-sulfide copper ore prior the …
Sokić et al. [7] performed acid leaching of copper from a copper oxide-sulphide ore excavated from the copper mine Cerovo, a part of the RTB Bor. These authors reported the leaching degree of ...
Sulfidic gold ore leaching by cysteine in the presence of …
To determine how the ore's sulfide and carbonaceous matter content affected the leaching, a portion of the ore was calcined at 800 °C for 4 h before leaching. The X-ray diffraction analysis (XRD, Rigaku Ultima IV, Akishia, Japan) using Cu Kα (40 kV, 40 mA) of the ore before and after roasting at 800 °C is shown in Fig. S2.
Efficient Synchronous Extraction of Nickel, Copper, …
Thus, the sulfation roasting‒water leaching process developing an efficient and eco-friendly pathway to simultaneous …
Ore column leaching with thermophiles: I, copper sulfide ore
1. Introduction. The discovery of mineral sulfide-oxidising thermophiles in a large scale simulation of copper ore heap leaching (Murr and Brierley, 1978) increased interest in their potential application in acidic ore dump and heap leaching.Two morphologically-distinct, rod-shaped, moderately thermophilic bacteria described at that …
Recovery of gold from sulfide refractory gold ore: Oxidation …
Different from traditional high-temperature roasting, concentrated sulfuric acid was used as both an oxidant and leaching agent in a sulfide-encapsulated refractory gold ore to decompose the ...
Copper Mining and Processing: Processing Copper Ores
Copper processing is a complicated process that begins with mining of the ore (less than 1% copper) and ends with sheets of 99.99% pure copper called cathodes, which will ultimately be made into products for everyday use.The most common types of ore, copper oxide and copper sulfide, undergo two different processes, hydrometallurgy and …
Study of Factors Affecting the Copper Ore Leaching Process
In the 1970–90s, it was suggested that different additives be used to intensify the sulfide copper ore leaching process with acid solutions, such as sulfuric and nitric iron (III) and ammonium salts, fluoride ions, surface-active substances, oxygen, ozone, sodium chloride, nitrates and chlorides of alkaline, and alkaline earth metals [1,2,3,4 ...
Oxidation of sulfide mineral and metal extraction analysis in …
The role of additives and the effect of microwave power on the decomposition of sulfide minerals in gold ore can be observed from the extraction rate of soluble metals during the water leaching of roasted ore. The results of this study can be seen in Fig. 5. Roasting without NaClO 3 with limited O 2 content resulted in relatively low metal ...
Copper Sulfide
All copper sulfides require the presence of Fe 3+ and O 2 as oxidizing agents for leaching to occur. The copper sulfide is oxidized by Fe 3+.The resulting Fe 2+ is reoxidized to Fe 3+ by O 2.The Fe(II)/Fe(III) redox couple acts in a catalytic manner in these reactions (shown for elevated-temperature reaction conditions where the sulfur-containing product …
(PDF) Leaching of Copper Sulphides
Three copper sulphide leaching and refining processes are discussed: total pressure oxidation, ferric sulphate leaching and copper chloride leaching. ... CLC ore body. The optimal rea ctor ...
(PDF) Hydrometallurgical Processing of Low-Grade Sulfide Ore …
When using heap leaching, ore grades can be significantly lower than in the conventional metallurgical technologies. For example, for the heap leaching process used by the Finnish Company "Talvivaara Mining Company Plc" at its nickel mine situated in the subarctic zone of the north-east of Finland, average nickel grade amounts to 0.27% ...
Intensification of Sulfide Copper-Nickel Ore Heap Leaching …
With the aim of intensification, improving economic efficiency, and controlling sulfide ore heap bacterial leaching features and leaching regimes are studied for lean copper-nickel ore with the participation of a bioreagent-oxidant prepared by iron-oxidizing micro-organisms and concentrated adsorption immobilization in a separate …
Leaching of a pyrite-based ore containing copper using …
The oxidation of sulfide-based ores is industrially relevant as it facilitates the extraction of valuable metals and eliminates undesired elements from an ore. Even though oxidation can be done thermally (pyrometallurgy), solution-based (hydrometallurgical) methods are currently sought as they represent a more sustainable option. Here, the …
Recovery of gold from sulfide refractory gold ore: Oxidation …
Sulfide refractory gold ore and pyrite used in each experiment were provided by a gold producing company in Hunan Province of China. The sulfide refractory gold ore and pyrite were dried for 12 h by vacuum drying oven at 60 °C, then ground and passed through a 200-mesh size screen thoroughly. ... Palladium and gold leaching from …
Bacterial leaching of a sulfide ore by Thiobacillus …
Bacterial leaching of a sulfide ore containing pyrite, chalcopyrite, and sphalerite was studied in shake flask experiments using Thiobacillus ferrooxidans and Thiobacillus thiooxidans strains isolated from mine sites. The Fe 2+ grown T. ferrooxidans isolates solubilized sphalerite preferentially over chalcopyrite leaching 7–10% Cu, …
Progress in bioleaching: fundamentals and mechanisms of …
Bioprospecting has led to the discovery of halotolerant Acidihalobacter spp., capable of sulfide ore leaching at high chloride concentrations (Khaleque et al. 2019). Nevertheless, it is well known that microorganisms can be adapted to harsh conditions by repeated cultivation under increasing selection pressure in the laboratory, ...
(PDF) Leaching of Copper Sulphides
Three copper sulphide leaching and refining processes are discussed: total pressure oxidation, ferric sulphate leaching and copper chloride leaching. The effect of mineralogy on the choice of...
Sulfide Ore
Sulphide ores were mostly created by (i) the intrusion of molten magma from the mantle into the crust of the earth and (ii) the formation of localized metal-rich sulphide ore …
Full article: The Direct Leaching of Nickel Sulfide Flotation
Roasting of nickel bearing sulfide concentrates followed by leaching has been practised at two operations in Canada, the Falconbridge iron ore plant and the Inco iron ore recovery plant, both treating nickeliferous pyrrhotite concentrates from their mill operations and one operation in Finland, the Kokkola refinery, treating pyrite-pyrrhotite ...
A fundamental study of the alkaline sulfide leaching …
In the present paper, a kinetic study of gold leaching in alkaline sulfide solutions is presented. For the gold leaching system, both a complexing lixiviant and an oxidant are required to effect dissolution. It will be shown that sulfide is an effective lixiviant, and the polysulfides are effective oxidants. 2. EXPERIMENTAL
Copper Ore Types: Sulfides vs. Oxides | INN
Copper-containing rock, or copper ore, holds only a small percentage of copper. Most of the rock is unwanted material, typically referred to as gangue.There are two main types of copper ore that ...
Metallurgist & Mineral Processing Engineer
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THE LEACHING OF A SULPHIDE ORE
In the present investigation the leaching mechanism of a Ni-Cu-Co-sulphide concentrate has been studied in an oxidative pressure-acid medium. The ore consisted of pyrrhotite, …
Experimental and theoretical study on strengthening leaching of sulfide
The ore sample for the treatment ore heap was the sulfide ore used previously in the bacterial leaching desulfurization experiment, and the control group sample was the sulfide ore to which an equivalent amount of water (rather than treatment solution) had been added.
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