Leaching Sulfides by Sulphuric Acid: Copper. Previous. ... In the case of ordinary ores the amount of this loss per ton of ore is generally small, although the percentage of the total silver in the ore be …
Sulfuric acid (H 2 SO 4) is a strong acid. It is an odorless, clear to dark brown, oily liquid that is corrosive. Sulfuric acid has many industrial purposes and is produced in greater quantities than any other chemical worldwide. In metal mining, sulfuric acid is used to leach copper oxide minerals. In one process, a solution of sulfuric acid laden
The dissolution of copper minerals is basically simple decomposition in the case of oxidized minerals, and oxidization-reduction for sulfide minerals. The resultant products are water soluble. The reactions of the common copper minerals with sulfuric acid and ferric sulfate are briefly …
The biotechnological copper leaching process involves the irrigation of ore materials or technogenic waste-containing metal sulfides using sulfuric acid solutions and iron salts, as well as the introduction of …
This study examines the potential for use of biogenic sulphuric acid for leaching of a low-grade Brazilian ore containing 0.64% copper occurring as brochantite, Cu 4 SO 4 (OH) 6, and as malachite, Cu 2 CO 3 (OH) 2. Ore was agglomerated with
The sulphuric acid leaching behaviour of copper oxide ore was applied in various kinetic models and interpreted graphically and assessed by the correlation coefficient (R 2) represented in Table 3. The highest value of correlation coefficient determines the fitting kinetic equation model that follows the dissolution of the element.
DOI: 10.1016/J.JTICE.2021.04.005 Corpus ID: 235575013; Leaching kinetics and predictive models for elements extraction from copper oxide ore in sulphuric acid @article{Apua2021LeachingKA, title={Leaching kinetics and predictive models for elements extraction from copper oxide ore in sulphuric acid}, author={M. Clotilde Apua …
The recovery of copper strongly promoted from 2 to 90% by increasing sulfuric acid concentration from 0.3 to 1.8 M. The increase in the solid-to-liquid ratio …
There is a significant number of literature reports on leaching of copper oxide ores in sulfuric acid solutions [7,8,9], processing of flotation waste in H 2 SO 4 solutions [10, 11], recovery of copper from waste of electrical [12, 13] and electronic equipment (WEEE) [14, 15] or extraction of copper from spent catalyst [16,17,18].
We compared copper extraction from ore 1) by addition of sulphuric acid to leach solution to maintain a pH of 2.0 and 2) by biological formation of sulphuric acid from S o oxidation in the ore bed. In the case of (1), the pH of the recirculating leach solution was adjusted 4 to 5 times weekly to pH 2.0 by addition of 5 M H 2 SO 4.In the case of …
The leaching of copper tailings in the sulfuric acid solution may involve the reactions shown in eqn (5)–(10). 11,24,25 The Gibbs free energy (Δ G °) is calculated to be −101.81 kJ mol −1 for Fe 3 O 4, −203.58 kJ mol −1 …
The aim of this study was the recovery of copper from the oxide copper ore by froth flotation and agitating sulphuric acid (H2SO4) leaching. The ore with 4.21% copper grade used in this study was ...
Yulong copper mine is located in the Changdu region in the eastern mountainous area of Tibetan Plateau, where the elevation of mining area is over 4500 m. At present, the oxide ores from Yulong No. II bodies are refractory to direct agitation leaching in sulfuric acid media under normal leaching conditions. In this research, 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, …
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 problem is to convert the sulphide into the oxide form. ... The Leaching of Dolomitic-Copper Ore Using Sulphuric Acid Under Controlled Conditions~!~!2010-06 ...
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, temperature and pH on the recovery of copper from chalcopyrite. The samples were ground and mixed with water and sulphuric acid to …
Recent focus on hydrometallurgical methods for non-sulfide copper ores prompted a study on leaching a copper oxide ore containing 2.22% Cu, 44.9% SiO2, …
It can be seen from Eq. () that the higher the Fe 3+ concentration, that is, the higher the redox potential, the higher the leaching rate of chalcopyrite.Hirato et al. [] testified that the leaching of chalcopyrite showed parabolic-like kinetics initially and then showed linear kinetics, and that Fe 3+ influenced the leaching rate of copper and the …
However, while Walter and Verner (1963) used a concentrated acid leach following pre-leaching, Donati et al. (2014) used a sulfuric acid bake at 250–300 °C followed by water leaching. Approximately 85% of the niobium, 75% of the tantalum, 90% of the rare earth elements and 99% of the uranium dissolved during the acid bake/leach …
When leaching with sulphuric acid lixiviants, and if the ore contains no sulphides or sulphates, the acid cost may constitute a preponderating proportion of the expense, and a source of cheap acid becomes a vital factor. ... Extraction of copper from suitable ore by leaching methods is generally assumed to cost less than the combined …
parallel reactivity of dolomitic-copper with sulphuric acid was not demonstrated [14]. A comparison of the effect of low and high dolomite on leaching of copper was not found in literature. Fig. (1). The shrinking core model for the leaching of dolomitic-copper ore. The ions from the acid migrate by diffusion from bulk
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 …
This paper provides an overview of hydrometallurgical copper extraction studies in which liquid extraction technology has been used with four copper deposits of different compositions. The sulfuric …
The objective of this study was to investigate the impact of acid curing/agglomeration of the Zaldivar ore on copper extraction and acid consumption, 2. ... of clinochlore with sulfuric acid while the copper sulfate was probably produced by the reaction of copper oxide with sulfuric acid. After leaching and washing, the six new …
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 …
Research on chalcopyrite leaching represents a great challenge, given its importance as one of the most abundant copper minerals and its significant role in global copper extraction. This study aimed to evaluate the effects of different parameters on chalcopyrite leaching by hydrogen peroxide as a strong oxidizing reagent in sulfuric …
A new concept for copper (Cu) metal leaching by the simultaneous use of cupric ions (Cu2+) and oxygen (O2) was proposed to improve Cu metal leaching in sulfuric acid. According to this concept, Cu2+ oxidizes Cu metal into cuprous ion (Cu+), and O2 oxidizes Cu+ into Cu2+. The improvement in Cu leaching efficiency from Cu …
The result shows that the copper leaching efficiency increased with an increase of sulfuric acid concentration from 135 g·L-1 to 270 g·L-1. The copper leaching efficiency was close to using sulfuric acid concentration 270 g·L-1 at 18 h. However, too high acidity (405 g·L-1) hindered copper leaching within 14 h. The leaching …
The sulphuric acid was found to be effective in recovering copper from chalcopyrite with efficiencies of 72 to 93 % for 75 micron particle size and 65 to 84% for the 212 micron …
The dissolution of carbonate gangue minerals, which are often ubiquitous in copper deposits, leads to the consumption of large amounts of acid during the leaching of such ores, which can make the process uneconomical (Habashi, 1970, Habashi, 1980, You-Cai et al., 2013).Table 1 shows the acid consumption and estimated time to …
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 ...
Chalcopyrite (CuFeS2) is commonly used ore in production of copper, but leaching of this ore is very slow and inefficient due to "passivation" during leaching at atmospheric conditions. In this study, in order to overcome drawbacks of the passivation layers, the concentrate supplied from Eti Bakır A.Ş. Küre Plant in Turkey was roasted at …
