The leaching of copper sulfide and copper oxide ores entails partial dissolution to cupric sulfate with sulfuric acid and iron sulfate. The presence of pyrites in many ore …
The leaching of nickel sulfide flotation tailings using activated carbon was investigated. • About 98 % nickel and copper was efficiently recovered using sulfuric acid augmented by the catalyst.
The kinetics and mechanisms of dissolution of the major base metal sulphide minerals, pyrite, chalcopyrite, galena and sphalerite in acidic (chloride) media have been …
In general, the hydrometallurgical process of sulfide ore including the heap leaching 12, acid leaching 13, and ammonia leaching 14,15. However, there are many drawbacks in the treatment of ...
The kinetic model was used to indicate the effects of these parameters on copper leaching from malachite ore in formic acid solution, considering particle size, acid concentration, leaching time, formic acid/malachite ratio, reaction temperature and stirring rate as variables.
The flowsheet discussed in this study is for treatment of 100 tons per day oxide-sulfide copper ore by the leaching process using sulfuric acid-ferric sulfate solvent. This flowsheet would also be suitable for a larger tonnage by proper sizing of the various units of equipment.
Copper sulfide ores must be concentrated before they can be economically transported and smelted. The universal technique for this concentration is froth flotation of finely ground ore. ... Type of leaching: Open agitation leach in pachuca air-stirred leach tanks: Feed: ... is leached in aqueous sulfuric acid solution to give a leach sulfate ...
Chloride solutions offer the stability to monovalent copper (cuprous ions precipitate only at solution pH > 9, cupric ions readily precipitate at solution pH of 3–4) and sulfur reports to the leaching residue in its elemental form compared with sulfuric acid leaching, where copper and sulfur are oxidized to higher oxidation stages of 2+ and 6 ...
Highlights • Acidic seawater-based media (ASM) could be utilized as an alternative of industrial freshwater. • ASM improve leaching kinetics of copper sulfide via …
Sulphide ores of copper are insoluble in dilute sulphuric acid leaching solutions, but a very high extraction can be obtained if the copper ore is in the oxidized condition.
The composition of the leach solution is chosen depending on the type of raw material subjected to leaching. These can be ... and improving leaching of copper sulfide ore in acid-nitrate-chloride ...
The leaching of copper sulfide and copper oxide ores entails partial dissolution to cupric sulfate with sulfuric acid and iron sulfate. The presence of pyrites in many ore deposits, and its reaction with water and oxygen to form iron sulfate and sulfuric acid, creates an important source of acid.
In this research, a hydrometallurgical method for recovery of copper from copper rich converter slag is investigated. The main copper containing phases of the slag are cuprite (Cu 2 O), delafossite (CuFeO 2) and metallic copper (Cu).The study investigates the effect of particle size, temperature, acid concentration, agitation and …
This process involves the leaching of copper from sulfide minerals using Fe 3+ ions, which is a strong oxidizing agent, in stirred reactors at atmospheric pressure …
The primary sulfide minerals of copper have been difficult to leach for the purpose of direct copper extraction. In particular, chalcopyrite has been observed to undergo a type of "passivation" under a variety of oxidative leaching conditions.
The leaching of sulfide copper ores of the djurleite and digenite type was effective through agglomerative pre-treatment with H 2 SO 4(conc) and NaCl, followed by leaching in an NaCl–H 2 SO 4 –O 2 media at room temperature.
The leaching of dolomitic-copper ore using sulphuric acid under controlled conditions was studied with a view to evaluating the economic value and the effect of ore pulverisation, particle size ...
The pretreatment stage had favorable effects, in terms of accelerating copper dissolution and improving leaching of copper sulfide ore in acid-nitrate-chloride media. Waste salts from caliche industry and waste brine from reverse osmosis can be used for providing the nitrate and chloride media.
Sulphide ores of copper are insoluble in dilute sulphuric acid leaching solutions, but a very high extraction can be obtained if the copper ore is in the oxidized condition. The …
The chemical binder is one of the critical factors affecting ore agglomeration behavior and leaching efficiency. In this study, we investigated the effect of the type of binder and mass fraction of the H2SO4 solution used on the curing, soaking, and leaching behavior of agglomerations. The results revealed that Portland cement (3CaO·SiO2, …
Key Terms. ore leaching: The process of recovering metals from ores by using a number of different techniques.; Microbial ore leaching (bioleaching) is the process of extracting metals from ores with the use of microorganisms. This method is used to recover many different precious metals like copper, lead, zinc, gold, silver, and nickel.
The copper sulfide minerals prevalent in many sulfide ores and dissolved during leaching are chalcocite, chalcopyrite, and covellite. Pyrite is an important mineral found in many sulfide ores and is oxidized …
When multi-metal sulfur-containing refractory gold ore is the subject of investigation, an oxidation-roasting pretreatment is applied to remove part of the sulfur and subsequent acid leaching of copper and cyanide leaching of gold.
The copper sulfide minerals prevalent in many sulfide ores and dissolved during leaching are chalcocite, chalcopyrite, and covellite. Pyrite is an important mineral found in many sulfide ores and is oxidized during leaching to …
Heap leaching is a simple means of recovering copper from oxide and oxide-sulfide ores. Although this method requires relatively low capital investment, it suffers from low copper recoveries and relatively high acid consumption.
The method depends on economics, ore type and grade and market conditions. ... Roasting to remove the sulphur and oxidise the copper for acid leaching is also an option. ... One of the important ...
Further, through the use of biooxidation, it is now possible to leach many of the copper sulfide minerals present in the ore. While chalcopyrite remains refractory to ambient temperature bioleaching, other copper sulfide minerals - the secondary sulfide minerals - such as chalcocite, covellite, bornite, etc. - are leachable by today's technology.
Substantial previous work targets copper-gold ores, but the present study focuses on a copper-silver ore, which will be leached following acidic pretreatment (sulfuric acid at pH 1) to assess the ...
Request PDF | Leaching analysis of copper and cobalt from sulfide ores in sulfuric acid-sodium chloride media. | This study investigated the effects of sulfuric acid concentration, sodium chloride ...
Against that context this paper outlines hydrometallurgical copper sulphide leaching options as alternatives to the more conventional pyrometallurgical processing route of copper sulphides.
Ouellet, Torma, and Bolduc (Citation 1975) studied the leaching of a copper-nickel sulfide concentrate and ore (refer to Table 4) containing pentlandite, pyrrhotite, and chalcopyrite, in a mixed sulfuric acid-nitric acid lixiviant.
The aim of this study was to improve the dissolution of copper sulfide ore composed mainly of chalcopyrite (1.21 wt %) and bornite (0.54 wt %) using a pretreatment before leaching. The effect of the pretreatment on …
Acid leaching of oxide-sulfide copper ore prior the flotation - A way for an increased metal recovery.pdf ... Hence, the application of cyanide to these types of ores can present some difficulty ...
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