High-pressure oxidative acid leaching on carbonaceous sulfide ore was investigated. • Optimized leaching parameters yielded over 97% copper extraction from the ore. • Selective dissolution of copper over iron is achieved when free acidity is ≈10 g/L. • A linear relation between log[Fe] and log[free acidity] in the PLS was established. •Web

The present invention discloses a new process for leaching sulfide minerals consisting of leaching crushed ore in a vat reactor, wherein the leaching solution is fed with an ORP value close to the upper limit suitable for leaching and the exiting leaching solution leaves the reactor with an ORP above the lower limit suitable for leaching the ore.Web

Copper-containing rock, or copper ore, holds only a small percentage of copper. Most of the rock is unwanted material, typically referred to as gangue. There are two main types of copper ore that ...Web

The traditional route for extracting copper from sulfide ores is smelting. Yet there is a growing case for leaching sulfides from lower grade ore bodies and especially for those ore bodies containing problematic elements like …

The imbalance between raw materials of high economic importance and their supply has increased the search for new approaches to obtain valuable elements from mining tailings. In this study, the extraction of copper, zinc, and lead from sulfidic tailing in sulfate–chloride media was investigated. A 33 Box–Behnken design was applied to …Web

The primary sulfide minerals of copper have been difficult to leach for the purpose of direct copper extraction. In particular, chalcopyrite has been observed to …Web

In general, the hydrometallurgical process of sulfide ore including the heap leaching 12, acid leaching 13, and ammonia …Web

In our previous study, the leaching efficiency of artificial indigenous and exogenous microbial communities on a mixed oxide-sulfide copper ore with and without energy substrate was investigated, indicating that indigenous community was inferior due to their low activity (Ma et al., 2017b).Web

In the 1970–90s, it was suggested that different additives be used to intensify the sulfide copper ore leaching process with acid solutions, such as sulfuric and nitric iron (III) and ammonium salts, fluoride ions, surface-active substances, oxygen, ozone, sodium chloride, nitrates and chlorides of alkaline, and alkaline earth metals [1,2,3,4 ...Web

The mechanisms of bioleaching of sulphide ore by A. ferrooxidans are divided into direct and indirect mechanisms. ... L. Wang, A. Wu, E. Kabwe, X. Chen, and R. Yan, "Copper recycle from sulfide tailings using combined leaching of ammonia solution and alkaline bacteria," Journal of Cleaner Production, vol. 189, pp. 746–753, 2018.Web

High-pressure oxidative acid leaching on carbonaceous sulfide ore was investigated. • Optimized leaching parameters yielded over 97% copper extraction from …Web

The ore sample for the treatment ore heap was the sulfide ore used previously in the bacterial leaching desulfurization experiment, and the control group sample was the sulfide ore to which an equivalent amount of water (rather than treatment solution) had been added.Web

Recovering gold from sulfide refractory gold ore has been an important guarantee for the sustainable development of gold industry, while there are many challenges in the treatment of sulfide refractory gold ore, such as environmental pollution and low gold recovery. In this study, A novel method for gold recovery from refractory gold ore was …Web

As shown in Figure 3, conventional cyanide leaching results in a low extraction of 46%, which may be associated with the use of a sulfide refractory gold ore. Salazar-Campoy et al. [ 22 ] obtained 37.9% …Web

H 2 O 2 Oxidation Leaching. Hydrogen peroxide is a strong oxidant, which has a significant effect on the leaching of insoluble copper sulfide ore. In addition, the product after oxidizing the mineral with hydrogen peroxide is water, which is highly environmentally friendly.Web

Sulfide refractory gold ore and pyrite used in each experiment were provided by a gold producing company in Hunan Province of China. The sulfide refractory gold ore and pyrite were dried for 12 h by vacuum drying oven at 60 °C, then ground and passed through a 200-mesh size screen thoroughly. ... Au in the ore, leaching residue and …Web

The authors describe the opportunities of low-grade sulfide ores and mine waste processing with heap and bacterial leaching methods. By the example of gold and silver ores, we analyzed specific issues and processing technologies for heap leaching intensification in severe climatic conditions. The paper presents perspectives for heap …Web

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 …Web

Abstract. The kinetics and mechanisms of dissolution of the major base metal sulphide minerals, pyrite, chalcopyrite, galena and sphalerite in acidic (chloride) …Web

Bioprospecting has led to the discovery of halotolerant Acidihalobacter spp., capable of sulfide ore leaching at high chloride concentrations (Khaleque et al. 2019). Nevertheless, it is well known that microorganisms can be adapted to harsh conditions by repeated cultivation under increasing selection pressure in the laboratory, ...Web

The first report in this recurring series on microbial processes in the minerals industries was published in 2003 (Olson et al. 2003), followed by an update after 10 years (Brierley and Brierley 2013) with bioleaching and biooxidation of sulfide minerals, primarily copper (in the case of bioleaching) and refractory gold ores (biooxidation) matured to …Web

Since the sulfide ore-body is conducting, the anodic and cathodic processes can occur at different places. Thus, ore-bodies, when exposed to weathering processes, develop a zonal arrangement of different mineral associations, which reflect different degrees of oxidation. ... Effective bacteria in sulfide leaching include Thiobacillus ...Web

3.2. Gold Bioleaching from Sulfide Ore Concentrate and e-Waste by R. tolerans and R. mucosus. Gold leaching yields from gold ore concentrate and e-waste by R. tolerans and R. mucosus were as shown in Figure 1 and p-values from two- and one-way ANOVA were as shown in Table 3 and Table 4, respectively.Web

Welham, Johnston, and Sutcliffe (Citation 2008) patented a process for leaching of base metal oxide and sulfide ores and concentrates which involved curing the ore or concentrate with either an oxidizing or reducing agent or metal-complexing ligand followed by leaching in an aqueous solution of ammonium carbonate and ammonia at …Web

The leaching of copper sulfide and copper oxide ores entails partial dissolution to cupric sulfate with sulfuric acid and iron sulfate. The presence of pyrites in many ore deposits, and its reaction with water and oxygen to form iron sulfate and …Web

Leaching of Cu is normally carried out by dump or heap leaching processes which is cost efficient in terms of installation and operation and requires use of acidophilic iron oxidising bacteria A. ferrooxidans to retain Fe in its oxidized form to cause solubilization of Cu from copper sulfide ore (Panda et al. 2015; Wang et al. 2020; Yin et al ...Web

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 ...Web

Copper processing is a complicated process that begins with mining of the ore (less than 1% copper) and ends with sheets of 99.99% pure copper called cathodes, which will ultimately be made into products for everyday use.The most common types of ore, copper oxide and copper sulfide, undergo two different processes, hydrometallurgy and …Web

After 20 days of leaching, the low-grade ore reached the acceptable percentage of gold dissolution (53%). Even so, the high-grade ore had been leached for 10 days, ... High-grade sulfide ore (Au: 0.26 wt%); Primarily composed of gold (as free visible particles greater than 2 mm), pyrite, quartz, and galena with chalcopyrite and sphalerite …Web

A smelting workaround. The traditional route for extracting copper from sulfide ores is smelting. Yet there is a growing case for leaching sulfides from lower grade ore bodies and especially for those …Web

Bioleaching may be effectively used to extract nonferrous metals from sulfide ores and concentrates. At the same time, some minerals are refractory and their bioleaching rate is often comparatively low that does not allow the required metal extraction rate to be achieved. In the present work, we studied the two-stage process, which included stages …Web

Metals extraction with microbes is not a novel approach; it has been applied for centuries; however, mechanism stays unknown. Isolation of A. ferrooxidans proves the role of microorganism in leaching. Today, A. ferrooxidans is most extensively characterized and commercially used for bioleaching [].Since 1970s, the number of microorganisms …Web

2.1. Overview and Industrial Applications. Leaching is defined as "the treatment of complex substances, like a mineral, with a specific solvent, able to separate its soluble parts from the insoluble ones" [].The process is used for the production of a concentrated solution of valuable solid material or to remove an insoluble solid from a …Web

The recovery of zinc (Zn) and lead (Pb) from a citric leach solution of a non-sulfide type ore flotation tailing was examined utilizing sulfuric acid precipitation followed by solvent extraction using di(2-ethylhexyl) phosphoric acid (D2EHPA) as the extractant. Following lead precipitation (98.9%) with sulfuric acid, the pregnant leach solution was …Web

Metal recovery from metal sulfide ore is carried out by chemolithotrophic bacteria like Acidithiobacillus ferrooxidans and Acidithiobacillus thiooxidans. The same is …Web

Sulphide Leaching system; Absence of oxidizing agents. Acid leaching: Dilute acids dissolve some metal sulphides with liberation of H 2 S, e.g. ... Copper sulphate can be used to separate Copper from Nickel in a sulphide ore or Copper from Fe in Cu -Fe sulphide ore. CuSO 4 solution can also be used for removing Pb, Zn, and Fe from …Web

Dissolution of sulfide ores requires oxidative leaching conditions, then ISR can be conducted by applying bacterial leaching, a technology which is established in …Web

Sulphide ores were mostly created by (i) the intrusion of molten magma from the mantle into the crust of the earth and (ii) the formation of localized metal-rich sulphide ore …Web