Effect of process variables on leaching behavior and kinetics …

The results showed that the nitric acid concentration had the most significant effect on the leaching rate. The leaching rate of 98.02% was achieved under the following optimal leaching conditions: a nitric acid concentration of 18%, a leaching time of 32 min, a solid–liquid ratio of 1:30, and a leaching temperature of 60 °C.

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The Effect of Aeration on Chalcocite Heap Leaching

The Effect of Aeration on Copper Leaching Kinetics. Figure 2 shows the copper concentration in the PLS and the cumulative extraction with and without aeration. Despite the lower cyanide soluble copper grade and larger particle size in the heap with aeration, which are unfavorable conditions for leaching, the aerated heap yielded PLS …

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Effect of water quality on the leaching of a low-grade copper sulfide ore

Copper extractions from a low-grade, ground copper sulfide ore (0.7% Cu) leached in three media were freshwater < seawater > double-strength seawater and pH 1.5 ⩾ pH 2; 84% extraction was achieved in pH 1.5 seawater in 28 days at 23 °C.Cu-oxide and carbonate dissolved completely and chalcocite was altered to secondary covellite, some …

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Agglomeration of fine-sized copper ore in heap leaching …

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 …

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Leaching of Copper Ores: Effects of Operating …

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 ...

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Concurrent leaching of copper and cobalt from a copper–cobalt ore …

A study involving the leaching of Cu and Co from a Cu Co ore in sulfuric acid (H 2 SO 4), citric acid (CA) and oxalic acid (OA) using hydrogen peroxide (H 2 O 2) as oxidant, was carried out.The ore was characterised by x-ray fluorescence (XRF), x-ray diffraction (XRD) and scanning electron microscopy coupled with energy-dispersive x …

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Effect of temperature on leaching behavior of copper …

Effect of temperature on leaching behavior of copper minerals with different occurrence states in complex copper oxide ores Author(s): Gai-rong WANG, Yuan-yuan LIU, Lin-lin TONG, Zhe-nan JIN, Guo-bao CHEN, Hong-ying YANG Pages: 2192-2201 Year: 2019 ...

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Effect of a pre-treatment with hydrochloric acid on the …

In the chalcopyrite leaching field, historically some authors have applied pre-treatments to sulfide copper ores before the leaching, where the pre -treatment with H. 2SO 4 and NaCl had reported promising results [1721]. Pre-treatment - is a necessary step to improve the leaching of copper oxide and secondary sulfide ores.

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Cyanide Leaching of Copper-Gold-Silver Ores

A technical and economical trade-off analysis of the cyanide and acid leaching processes is presented in order to establish under what conditions cyanide copper leaching is a competitive ...

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Leaching of Copper Ores: Effects of Operating Variables

in a total estimate of 60 million tons of copper ore reserves, with an average grade of 1.63 % [17]. There are many studies published in the literature on the leaching of non …

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Effect of Chloride and Ferrous Ions on Improving Copper Leaching …

Although the importance of black copper ores is well established, many topics remain to be studied. This manuscript describes the efforts to improve copper recovery from refractory ores on a pilot scale. Preliminary tests provided the water dose to form a stable and compact agglomerate of 89 L per ton of ore and an acid dosage of 40 kg per ton of ore. …

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Leaching of Copper Ores: Effects of Operating …

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:

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Enhanced leaching of copper from refractory oxidized copper ore …

To investigate the effect of time on the copper leaching rate, leaching tests were conducted on the ores using both the acidic system with CaF 2 and regular acid leaching at varying times. The experiments were conducted under controlled conditions of 120 kg/t sulfuric acid dosage, 5wt% CaF 2 dosage, and 60 °C leaching temperature …

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Agglomeration and leaching behaviors of copper oxides with …

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 …

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Effect Of Leaching On Permeability Of Drill Cores From A Copper Ore …

This paper discusses a laboratory investigation that studied the microscale flow characteristics of copper ores and the variation in flow behavior resulting from flow of leach solution. Fractures in 40- and 100-mm-diam (1.5- and 4-in.-diam) cores were first mapped by visual inspection. The permeability of cores to water-stressed in a triaxial …

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Acid leaching of oxide-sulfide copper ore prior …

The main important parameters in ammonia leaching of malachite ore are determined as leaching time, ammonia/ammonium concentration ratio, pH, solid/liquid ratio, leaching temperature, and …

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Copper Acid Leaching Plant

The main methods of processing copper oxide ore are: Flotation and Leaching. For copper oxide ore with large mud content and easy to mud, the traditional sulfidation flotation recovery rate is low, and it is difficult to solve the problem of mud interference; the stirred leaching method has the advantages of short leaching cycle and high copper …

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Copper Leaching Using Mixed Explosive-and-Reagent Pretreatment of Ore

Abstract The mixed explosive-and-reagent effect exerted on a cemented mineral mass, which simulated an ore body, by explosive charges arranged in reagent solutions was investigated. Pretreatment of the model material by explosive injection of different reagent systems leads to pre-oxidation of copper contained in the material, …

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Types, Difficulties in Ore Dressing and Technological …

These factors require continuous optimization of the dressing process of refractory oxidized copper ores to improve efficiency and recovery. 04 05 Refractory oxide copper ore beneficiation process. For refractory copper oxide ores, the following are the current main mineral processing processes and technological developments: 1.

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The Application of Diagnostic Leaching to Copper and Gold Ores

Abstract. Three different refractory carbonaceous gold ores from the Carlin operation in northeastern Nevada were investigated to characterize the effect of passivation treatments on the nature of ...

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(PDF) Leaching of malachite ore in ammonium sulfate …

In this research work, the leaching behavior of a copper oxide ore sample prepared from the Qaleh-Zari copper mine with a very high grade of 5.4% Cu (malachite and azurite) was investigated to ...

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Process Mineralogical Factors Affecting the Beneficiation of …

As the resources of easily processed gold ore are decreasing, refractory gold ore has gradually become the main ore source for gold production. The so-called refractory gold ore refers to gold ore with low total recovery rate of dressing and smelting, poor economic benefits, and process technology subject to environmental restrictions. This …

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December 2021 Effect of LixTRA Leaching Aid in Heap …

conditions, such as in heap leaching of gold ores. However, for heap leaching of copper oxide ores and microbial leaching of sulfidic ores, most of the readily available binders are not capable to withstand the extreme acidic environment and the attack by microbial organisms (Bouffard, 2005). These environments weaken the bonds formed, causing

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Leaching Oxidized Copper Ores: Effect Of Strength Of …

LEACHING OXIDIZED COPPER ORES; EFFECT OF STRENGTH OF ACID IN LEACHING SOLVENT 1 By John D. SuIlivan 2 and G. L. Oldri~ht3 INTRODUCTION In …

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Kinetics of Hydrochloric Acid Leaching of Copper …

Kinetics of Hydrochloric AcidLeaching of Copper. from its Ore. Yousef Mubarak. Department of Chemical Engineering, American University of Beirut, Lebanon, [email protected]. ABSTRACT. The …

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Efficient Acid Leaching of Low Carbonate Copper Oxide Ore: …

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, …

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(PDF) A Study on the Selective Leaching of the Copper

This study were carried out sulfation roasting and selective leaching test for the effective recovery of copper component in concentrate obtained by froth floatation of Autrallian low grade copper ...

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The effect of sulfide minerals on the leaching of gold in …

The oxidation of gold and some sulfide minerals in solutions containing 5 mmol L − 1 cyanide and 50 mmol L − 1 sodium perchlorate as background electrolyte was studied using linear sweep voltammetry, and the polarization curves are shown in Fig. 1.It can be seen that gold oxidation commences at − 620 mV and approaches a diffusion …

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Effect of temperature on leaching behavior of copper …

The coupling of washing with adsorption process can be adopted for the treatment of soils contaminated with heavy metals pollution. However, the complex environment of soil and the competitive behavior of leaching chemicals considerably restrain adsorption capacity of adsorbent material during washing process, which …

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