P.A. Olumbabi, "Sulphuric acid leaching of zinc and copper from Nigerian Complex Sulphide Ore in the prescence of hydrogen peroxide," The Journal of the South African Institute of Mining and Metallurgy, vol. 106, pp. 765-770, 2006 Z. Rajko, N.V. Vracar and Z. Kamberovic, "Leaching of copper (I) sulphide by sulphuric acid solution with the ...

This study investigated the operating parameters that affect the kinetic dissolution of copper and cobalt from sulfidic ores. The sulfuric acid concentration, temperature, sodium chloride concentration, particle size range, and leaching time were selected to deduce the kinetic mechanism of the leaching reaction. Other parameters, …

Recently, a study on the kinetics of copper extraction from copper smelting slag by pressure oxidative leaching in sulfuric acid solution was presented by Shi et al. 76 They reported that ...

Leaching kinetics and predictive models for elements extraction from copper oxide ore in sulphuric acid M. Clotilde Apuaa,*, Mapilane S. Madibab a School of Chemical and Metallurgical Engineering ...

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].

4Cu + 8NaCN + 2H 2 O + O 2 → 4NaCu (CN) 2 + 4NaOH. (3) The formation of copper and silver cyanide complexes affects the gold recovery in both the cyanide leaching process as well as the purification and refining stages [ 7 ]. These effects mainly interfere with the gold cyanide reaction and the carbon adsorption.

A set of experimental batch leaching tests was executed to study the effect of pH, time, temperature, and stirring speed on the relative leaching yields of Cu, Co, Ni, and Fe of an oxidized copper ...

In recent years, with the increasing consumption of copper, a large number of high-grade copper ores are steadily becoming depleted [2]. Therefore, copper has to be extracted from decreasing quality of copper ores. ... Zhang et al. [32] studied neutral and then sulfuric acid leaching of zinc and copper from the alkali leaching residues of ...

Heap leaching & SX-EW is a method of extracting pure copper from oxide ore by placing the crushed ore on a pad in a heap and spraying the leaching solution, sulphuric acid, over the heap. The acid trickles through the heap and dissolves the copper mineral into solution. The leach solution collects at the bottom of the pad in a collection pond.

Jhunalyn Parantar. 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 …

In our previous work, we proposed a sulfuric acid roasting and water-leaching process to treat Chinese low-grade nickel-copper sulfide ore. The process yielded high selective extractions of nickel and copper and solved the problem of sulfuric acid accumulation in Jinchuan (located in the Gobi desert in western China, conferring a …

The beneficial effect of chloride on sulfide leaching in sulfuric acid has been widely reported over the last 3–4 decades but the reasons have not been resolved. A review of recent literature shows that sulfide leaching is complex due to alternative reaction paths, competitive reactions and interim compounds formed on solid surfaces or in ...

Ore agglomerations began to be heavily destroyed and even to disintegrate when the sulfuric acid solution concentration was higher than 30 g/L, which was caused by the excessive accumulation of reaction products and residuals. ... and E. Muñoz, Ionic liquids as additives for acid leaching of copper from sulfidic ores, Hydrometallurgy, …

In this study, the selective dissolution of copper and iron from the molybdenite (MoS 2) concentrate consisting of chalcopyrite and pyrite by acidic sodium nitrate leaching has been investigated to improve the quality of molybdenite.The influence of various leaching parameters, namely sodium nitrate (NaNO 3) and sulfuric acid (H 2 SO 4) …

Based on the Eh–pH diagram for the Se–H 2 O system, a new method is proposed for leaching selenium from copper anode slimes using a nitric acid–sulfuric acid mixture. The effects of solid/liquid ratio, HNO 3 and H 2 SO 4 concentrations, leaching temperature, and reaction time on the leaching efficiency of selenium were …

A kinetic study of the sulphuric acid leaching of oxidised copper ore, primarily malachite, was carried out. The effects of leaching time, stirring speed, acid concentration, solid to liquid ratio, reaction temperature, and particle size of the ore were investigated. Using the best conditions, the copper recovery was nearly 94% at 25 °C …

1. Introduction1.1. Occurrence and characteristics of chalcopyrite. Much of the world's economic copper resource occurs as chalcopyrite (CuFeS 2), commonly at low grades (≤ 0.5% Cu).Chalcopyrite is the dominant Cu ore mineral in most porphyry deposits, which make up an estimated 70% of the global Cu resource (Singer, 2017), and is also …

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.

The support rock itself may be a low-grade copper ore. The ratio of support rock to concentrate is in the range of 5:1 to 10:1 by weight. The heap is inoculated with thermophilic bacteria and a process leach solution consisting of sulfuric acid, ferric iron and nutrients is applied to the heap. Low-pressure blowers supply air through a system ...

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, Cu4 SO 4 (OH) 6, and as malachite, Cu2 CO 3 (OH) 2. Ore was agglomerated with elemental sulphur and sulphur-oxidizing microorganisms. Copper extraction was …

C. For category A, 100ml of sulfuric acid were used whereas for category B sulfuric acid was coupled with hydrogen peroxide in couples of (90,10); (80,20); (60,40) and (50,50) ml. In category C, the proportions of oxide and sulphide were coupled in (90,10); (80,20) and (70,30) while the volumes of sulfuric acid and

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 existing leaching process simulation models developed in ASPEN Plus provide research knowledge gaps to be explored; these include the following: (1) the leaching of ores in a mixed media, e.g., sulfuric acid—sodium metabisulfite, (2) the leaching of polymetallic ores, and (3) the consideration of the dissociation of sulfuric …

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 …

A sulfuric acid tailing granulation process followed by subsequent heap leaching of granules is proposed. Various methods of preparation and storage of the granular material are discussed. A ...

The outcome of this work has shown that the sulphuric acid bake-leach process is a possible alternative to the reductive leaching method for copper-cobalt oxide ores. Keywords Democratic Republic of Congo (DRC), Mixed Copper-Cobalt Oxide, Sulphuric Acid Baking, Sulphate, Reducing Agent, Metal Dissolution 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 obtained from Çorum-Dangaz region of Turkey. Native copper, cuprite (Cu2O), tenorite (CuO), and malachite (Cu2(OH)2/CO3) were the main …

At high-temperature pressure leaching conditions, th e f ormation of sulphuric acid from sulphides in the ore is f avoured, however at medium- and low-temperature conditions (150 – 165 o C and ...

The optimum conditions for copper leaching from the middling were identified as sulfuric acid concentration at 103.74 g/L, nitric acid concentration at 12.50 g/L and leaching time of 30.98 min ...

Nitric acid is both a strong acid and a strong oxidant, and is widely used in the leaching of copper sulfide ore. However, the nitrogen oxides produced during the leaching process of nitric acid are not easy to recover. Therefore, the economic and environmental friendliness of leaching copper with nitric acid is poor.