copper ore acid leaching

The process requires the use of hydrochloric acid as leaching solution when treating copper ores, which may be produced in the plant itself. The operation is very simple, using sulphuric acid and NaCl as raw materials. Our experiences have been done with solutions containing 36 grs. of hydrochloric acid per liter of solution in order to have …

A required amount of 75 g/L. sulphuric acid solution was used and 5 g of the ground copper oxide ore with a solid to liquid. ratio of 13%. Leaching parameters such as leaching time from 0.25 – 4 ...

Hydrometallurgical extraction accounts for about 20% of total primary copper production. Most of this is produced by heap leaching. Heap leaching consists of trickling H2SO4-containing lixiviant ...

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, Solvent Extraction (SX) and Electrowinning (EW). Depending on ore characteristics other …

A new concept for copper (Cu) metal leaching by the simultaneous use of cupric ions (Cu 2+) and oxygen (O 2) was proposed to improve Cu metal leaching in sulfuric acid.According to this concept, …

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 …

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. Microorganisms are used because they can: lower the production costs. cause less environmental pollution in …

The dominating copper phases in the slag are Cu, Cu 2 O and CuFeO 2 (XRD and SEM-EDS). Leaching copper from these phases using sulfuric acid has a fast dissolution kinetics. Smaller particle size, higher temperature (up to 40 °C) and increasing mixing power (up to 0.26 kW/m 3) enhance the leaching kinetics.

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 ...

In this study, weak acid in the curing and leaching stages of copper ore was incorporated, and we analyzed its effect on the dissolution of copper and final impurities. The weak acid corresponds to a wastewater effluent from sulfuric acid plants produced in the gas treatment of copper smelting processes. This effluent is basically water with high acidity …

The leaching of copper maximum in a sample was in the order of leaching of copper in three ores is as Sample C>sample D>Waziristan chalcopyrite. The experiments showed that the untreated raw oxidized copper ore show significant leaching which is 9.5% for saline and 35.5% for fertile soils respectively.

Leaching of ore by dilute sulphuric acid compared to acid produced 0 10 20 30 40 50 60 biologically in the ore bed days We compared copper extraction from ore 1) by addition of sulphuric Fig. 1. Change in leach …

Olubambi et al. (2006) studied the leaching of zinc and copper from Nigeria bulk sulfide ore with sulfuric acid in the presence of hydrogen peroxide (H 2 O 2 ), with the aim to investigate the ...

The best conditions for leaching ore were determined as follows: sulfuric acid (49–76 g/l) for 16 days. Copper oxides are recovered in the solution at a rate of 99%. Sulfide copper is present in 0.15% of the sulfuric acid leach cake. It is clear that the copper oxides have been completely transformed to sulfate solution.

Here, the leaching of a sulfide ore (32% Fe, 2% Cu) is investigated using a mixture of sulfuric acid and hydrogen peroxide (0.15 M H2SO4 and 0.5 M H2O2), in proportions forming a slurry 10% w/w ...

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 ...

Heap leaching generates a pregnant leach solution (PLS) containing 1–6 g/L Cu²⁺, which is sent to solvent extraction and electrowinning for copper production.

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 ...

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 … See more

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.

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. …

For instance, Liu et al. found that the leaching kinetics of a low-grade complex copper ore in ammonia-ammonium chloride solution followed the diffusion process with the activation energy of 23.279 kJ/mol. Seo et al. reported that the leaching kinetics of a Cu-Co ore in the sulfuric acid and hydrogen peroxide system followed the shrinking …

1. Introduction. Heap leaching is a low-cost, flexible hydrometallurgical process for recovering valuable metals from low-grade ores (Nosrati et al., 2012).In this process, the ore bed must be porous and permeable to permit flow of the leach solution (Lewandowski and Kawatra, 2009a).However, fine particles usually migrate into the …

Asghar Azizi. 646 Accesses. 6 Citations. Explore all metrics. Abstract. In this study, the reject fraction of the jaw crusher, located in the first part of the crushing circuit, …

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 nitric acid pre-treatment improved the extraction of gold and silver in subsequent cyanide leaching (1.5 g/L NaCN) to 82% Au and 87.5% Ag with a concomitant decrease (up to 54%) in cyanide ...

When processing copper through heap leaching, vast quantities of ore and ... Acids are introduced to copper-bearing ore, seeping through and dissolving copper and any other metals, including radionuclides. The liquid that "leaches" through the rocks is collected. This liquid contains the dissolved copper, known as a pregnant leach solution ...

Sulfuric acid solution containing ferric iron is the extractant for industrial heap bioleaching of copper sulfides. To start a heap bioleaching plant, sulfuric acid is usually added to the irrigation solution to maintain adequate acidity (pH 1.0–2.0) for copper dissolution. An industrial practice of heap bioleaching of secondary copper sulfide ore …

Heap leaching is a firm extractive metallurgical technology facilitating the economical processing of different kinds of low-grade ores that are otherwise not exploited. hydrometallurgy leaching gangues clays minerals heap leaching agglomeration. 1. Introduction. According to Toro et al. [ 1], copper mining is an industry that is in constant ...

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. ... The source of sulphuric acid for leaching is usually a major ...

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 …