A maximum recovery of 83.6% Cu and 77.2 % Co were achieved at 80ºC using 150 mM of citric acid. The recovery of copper and cobalt from the oxidized ore using fungal metabolic acid was found to be ...

Sulfuric acid leach solution is the conventional liquid bridge used for copper ore agglomeration, but these agglomerates exhibit poor stability when compared to the agglomerates formed using ...

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 ...

Copper extraction from primary copper sulfide ore from a typical porphyry copper deposit from Antofagasta, Chile, was investigated after leaching with a chloride-ferrous media at two temperatures. The …

Abstract 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 …

Boiling the sulphides with strong sulphuric acid in an iron pot; Dissolving out the sulphate of copper and silver in a lead- lined tank, leaving a residue containing the gold and lead of the sulphides, 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 leaching reagent (dilute sulfuric acid) is sprayed through sprinklers on top of the heap pile and allowed to trickle down …

Copper tailing is the residual ore left after copper extraction during a floatation process, which is more difficult to recycle as compared to the copper slag. ... Each sulfuric acid leaching experiments of copper tailings was repeated three times, and the average value of these three values was used to reported to avoid any errors.

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. ... J. Morales, and E. Muñoz, Ionic liquids as additives for acid leaching of copper from sulfidic ores ...

The principal copper-bearing mineral in the ore is chrysocolla. Dilute sulfuric acid solutions containing from 30 to 35 grams per liter of acid are used to leach the ore. The pregnant liquors and wash waters obtained from the vat leaching operation are pumped to a precipitation plant where the copper is recovered by use of iron scrap.

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.

sulfuric acid concentrations and decrease in the particle size of ore. Leaching of about 92.5% of copper is achieved using 0.125-0.074 mm ore particle size at a reaction temperature of 353 K for 180 min reaction time with 150 g/dm3 sulfuric acid. The solid/liquid ratio was maintained constant at 1:15.

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 …

The leaching of a copper-containing pyrite-based ore using hydrogen peroxide and sulfuric acid has been studied. The mechanisms involved in the reaction, …

conducted. In category A, oxide and sulphide ores were separately leached with sulphuric acid where particle size influence was investigated and the best size identified as well as the optimum pH value. Category B, the sulphide ore was leached with sulphuric acid in conjunction with hydrogen peroxide. An improvement in copper and cobalt dissolution

dissolution of copper oxide ore. Figure 3. E ect of sulphuric acid concentration on the dissolution of copper oxide ore. ratio of 10 mL/g is found to be optimal for leaching of copper using H2SO4. This can be explained in a way that the leaching agent is in excess of the calculated amount for the extraction of copper. After 75 min of

For each experiment, 40 mL of various sulfuric acid solutions of 0.4–2.0 M and 10 g of ore sample were employed to dissolve the copper and iron incorporated in the malachite ore. Then, the impure copper solution was treated with hydrogen peroxide (H 2 O 2 ) to ensure that all iron (II) ions were converted to iron (III).

However, it was noticed that the copper leaching began to reach equilibrium state at 60 min so is iron leaching whilst at the same equilibrium time interval cobalt dissolution continued to rise. Conclusion. The progress of reactions between copper, cobalt and iron in copper oxide ore and sulphuric acid under different reaction conditions was ...

The first stage is an oxidation leaching using sulphuric acid (120 kg/tonne ore) at an Eh of 900 mV for 2 h. Then, the reduction stage takes place in 2 h with SO2 gas sparging for Mn and Co ...

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 ...

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 …

The multimetallic sulfide copper ore containing large amounts of lead and iron was roasted in air atmosphere in the presence of calcium oxide, and the calcinate obtained was leached in sulfuric acid solution to extract copper. Characterization of the raw materials, calcinates and leach residues was conducted by using XRD and SEM/EDS …

Dump leaching should not work; and yet it does. This study investigated the leaching of coarse-sized copper sulphide ore, with top sizes ranging from 150 to 250 mm. The simulated run-of-mine ore sizes were leached for more than six months. ... The model was deployed to investigate the leaching kinetics of an oxide copper ore by sulphuric …

The results of experimental investigation on the study of leaching kinetics of copper oxide ore in sulphuric acid solution were discussed. The effect of time, pH, stirring speed and temperature on the extend of dissolution was investigated. The XRD analysis indicated that copper is mainly in the form of malachite mineral CuCO 3 (OH) 2. The ...

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 outlined below. The …

Reactions by which specific copper minerals are dissolved in leaching, either with sulfuric acid or sulfuric acid plus ferric iron were given by Van Arsdale: Azurite Cu3 (OH)2· (CO3)2 + 3H2SO4 ↔ …

In the pre-treatment tests, acid leaching with/without the addition of hydrogen peroxide (4.5-45 kg H2O2 per tonne ore) was carried out to eliminate the copper interference. A separate test using ...

Mineralogical requirements are similar to those for conventional heap leaching: oxide copper minerals which dissolve quickly in sulfuric acid are desirable. Copper sulfides have been leached in situ, but sulfide mineralization poses additional challenges, as an oxidant such as ferric sulfate must be delivered to the ore (see Section …

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 H 2 SO 4 and 0.5 M H 2 O 2), in proportions forming a slurry 10% w/w. The leaching process is found to occur in two stages, the first corresponding to an exothermic, peroxide-mediated dissolution, and the second ...