Agitation leaching is a promising technology in hydrometallurgy for treating copper–cobalt oxide ores. In this work, the behavior of oxide ores containing around 2.3% Cu and 0.3% Co received from Congo was investigated for varying particle size, acidity, pulp density, temperature, leaching time, and reduction potential. XRD, optical microscopy …

XRD pattern of leaching residues (a) with weak acid and (b) without weak acid, and of (c) copper ore. SEM-BSE image for leaching residues (×1000) and the SEM-EDS for the particle in the red ...

In copper dump leaching, run-of-mine ore is irrigated with acidic leaching solution to generate aqueous cupric ions for further processing. The very large size of the ore particles being leached, as much as two meters in diameter, should preclude any significant metal recovery. Dump leaching should not work; and yet it does.

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, …

In process scheme 1, indirect bioleaching (IBL), the ore bed porosity is assumed to be completely filled with the leaching solution and leaching of copper sulfides occurred just with the 3 g/L of ferric contained in the incoming leaching solution produced in an external bioreactor (Pakostova et al., 2017; Biomore, 2018).

Extraction of copper from suitable ore by leaching methods is generally assumed to cost less than the combined expense of concentration, smelting, and refining, and experimental data tend to confirm this opinion. At the Butte-Duluth plant, which is handling in excess of 100 tons of oxidized ore daily, the copper is said to cost $0.085 …

Leaching processes of metallic copper or ores containing copper in the divalent state have been the subject of many research works in recent years [9], ... Determination of the optimum conditions for leaching of malachite ore in H 2 SO 4 solutions. Chem. Eng. Technol., 24 (2001), pp. 409-413. View in Scopus Google Scholar …

The ore treated in the Pueblo Viejo gold leaching process contains copper, which is removed from the process as copper sulphide. This application utilizes high-quality reactor tec hnology and Paques

Abstract. Based on the extensive experience of heap leaching operations, crushed ore agglomeration can be successfully considered and utilized as a pretreatment step for the heap leaching of ores containing significant amounts of fines and clay minerals. The drum agglomeration is considered as a pretreatment step for the heap leaching of …

Leaching of copper from a Jordanian copper ore has been studied using a stirred batch reactor with hydrochloric acid as the main …

Optimal leaching was achieved and further refined for the ASR in a two-step indirect leaching system with biogenic ammonia. Copper leaching was the result of local corrosion and differences in leaching against the synthetic (NH 4) 2 CO 3 control could be accounted for by pH shifts from microbial metabolism, subsequently altering free NH 3 ...

Deep-eutectic solvents containing iodine can be used for dissolution of sulfide minerals. 28–30 Copper-containing sulfidic gold ores have been leached in ionic liquids. 31 Different authors have investigated the …

How copper dump leaching works 1. Introduction. A widely used method for exploiting secondary sulphide copper deposits involve leaching the ore in... 2. Materials …

Leaching processes can be defined as the selective removal and/or extraction of metallic values from a mineral, causing a suitable solvent of the leaching …

This study is limited in general to percolation leaching as it is the most widely used method to give proper contact of solvent with the ore to effect extraction of the copper. One of the important factors in percolation leaching is the size reduction necessary for copper recovery within reasonable time limits. It is …

In copper dump leaching, run-of-mine ore is irrigated with acidic leaching solution to generate aqueous cupric ions for further processing. The very large size of the …

There are two main types of copper ore that are of interest: copper oxide ores and copper sulfide ores. ... That allows for simultaneous leaching with sulfuric acid to produce a copper sulfate ...

In situ leaching has a huge potential for low-grade ore deposits and deeply buried ore bodies (> 1 km below the land surface) for which conventional mining and processing is uneconomical. Besides uranium (U), the commodities gold (Au), copper (Cu), nickel (Ni), rare earth elements (REE), and scandium (Sc) have been successfully …

For the hydrometallurgical treatment, bio heap leaching of 40,000 t of low-grade ore using agglomeration and aeration was proven to achieve a copper recovery of 32.6% for the chalcopyrite portion of the ore over 326 days of operation. On the economic side, the operating cost of the process per tonne of copper cathode for both processes …

Leaching of Oxide Copper Ores by Addition of Weak Acid from Copper Smelters by Giselle Araya 1, Norman Toro 2,3,*, Jonathan Castillo 1, Danny Guzmán 1, Alexis Guzmán 1, Pía Hernández 4, Ricardo I. Jeldres 4 and …

its first leaching additive that is compatible with the entire Leach à SX EW process. History Heap leaching copper from oxide and secondary sulfide ores has been practiced commercially since the late 1960's. This methodology is mostly used for low-grade ores and involves the following basic processing steps: Mining, Crushing, Leaching,

The composition of copper ore samples was analyzed with the use of fluorescence and chemical methods. Table 1 shows the content of the main valuable component—copper—as well as metals with the highest content that affect the leaching process. Table 1. Amount of copper and other metals in copper ore samples (%).

To solve the problem of low permeability and lower extraction rates of high-mud ores, a surfactant was added as a penetrant to the pregnant leaching solution …

Typical copper electrolyte solution produced from leaching of copper ore, contains 25–60 g/L of copper and 0.1–10 g/L of iron in the electrowinning stage (Evans, 2003; Habashi, 1998). These industrial processes operate in temperatures of 40–60 °C, pH of 1 and current densities in the range of 20–45 mA/cm 2 are used ( Moats and Free ...

Bruynesteyn A, Duncan DW. Effect of particle size on the microbiological leaching chalcopyrite bearing ore. Solution Mining Symposium 1 974. Google Scholar D'Andrea D, Chamberlain PG, Fletcher LR, Ground characterization for in situ copper leaching. Proceedings of the Las Vegas Symposium on Leaching and Recovering Copper from …

The industrial operation applied to the leaching of copper sulfides considers the formation of a heap of material to be leached. Heap leaching requires ore preparation, primarily size reduction, to maximize mineral-leach interaction and placement of an impervious base to prevent leach loss and contamination of water bodies . A drip …

This work investigates the effect of an agglomeration and curing pretreatment on leaching of a copper sulfide ore, mainly chalcopyrite, using mini-columns in acid-nitrate-chloride media. Ten pretreatment tests were conducted to evaluate different variables, namely the addition of nitrate as NaNO3 (11.7 and 23.3 kg/ton), chloride as NaCl (2.1 …

In copper mining, various physicochemical processes ... Subsequently, the influence of pyrite on copper leaching was explored. High-pressure leaching tests examined factors like acid concentration, oxygen pressure, temperature, pulp density, free acid, and iron precipitation. Conducted in a 2 L autoclave, the experiments revealed that …

Leaching of copper from a Jordanian copper ore has been studied using a stirred batch reactor with hydrochloric acid as the main lixiviant, under the following conditions: temperature 25 – 45 oC ...

1. Introduction. In situ leaching (ISL) is the circulation of a fluid through an ore deposit to dissolve a target metal or mineral, with subsequent return of the liquor to the surface for processing. In some cases, lixiviant is applied to formations using a system of injection and recovery wells (see Fig. 1 ).