Bioleaching of Phosphate Minerals Using Aspergillus niger
Rare earth elements (REE) are essential in high-technology and environmental applications, where their importance and demand have grown enormously over the past decades. Many lanthanide and actinide minerals in nature are phosphates. Minerals like monazite occur in small concentrations in common rocks that resist …
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Fupeng LIU | PhD | Associate Professor
In the first leaching stage with sulfuric acid media, 92% of zinc and 94% of copper were leached resulting in significant gallium and germanium enrichment up to ca. 300%. In the second leaching ...
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Minerals | Free Full-Text | Cupric and Chloride Ions: Leaching …
In this paper, the effect of the cupric and chloride ions concentrations on copper dissolution from chalcopyrite concentrate was studied in acidified media. Variables included three different concentrations of Cu2+ (0.5, 1.5, and 2.5 g L−1), four different concentrations of Cl− (0, 5, 7, and 10 g L−1), two different pH values of 1 and 2, and a …
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Behavior and Kinetics of Copper During Oxygen Pressure Leaching …
For the leaching process of chalcopyrite solid products layer consisting of elemental sulfur, alkaline ferric sulfate and copper sulfide and etc. form the parcel covering on the surface of unreacted mineral core, and the solid product layer is difficult to dissolve in the leaching process, causing the unreacted internal mineral is hard to ...
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Heap leaching copper ore using sodium nitrate
The heap leaching of copper bearing ores is improved by using sodium nitrate as an oxidizing chemical reactive in a sulphuric acid leaching solution. In particular, the ore is crushed to <6 mm and stored in heaps less than twelve meters high. The heaps are irrigated with a dilute solution consisting essentially of sulphuric acid and sodium …
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Recovery of copper from alkaline glycine leach solution …
Glycine solutions in an alkaline environment have been shown to be able to leach copper from its oxide, native and sulfide minerals as a copper glycinate complex. This paper explores the recovery of copper from its aqueous glycinate complexes at alkaline pH through solvent extraction.Solvent extraction of copper from synthetic glycinate liquor …
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Chemical and Biological Leaching of Chalcopyrite- Elemental …
In the chemical leaching experiments at 70ºC, only 14% copper was recovered from the original chalcopyrite sample while the maximum copper extraction was 78% from bornite produced at 450ºC (90 ...
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How copper dump leaching works
Being a secondary sulphide, or supergene ore, the main copper-bearing mineral was chalcocite (Cu 2 S), with the host rock consisting of quartz monzonite with vuggy silica alterations ... Copper leaching of 4 m ore beds at different times with respect to starting particle size. Scales are shown for 80% passing size (d 80) and fines (-6.3 mm ...
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Leaching and Recovery of an Oxide Gold Concentrate Using …
Based on these studies, the environmentally friendly process consisting of thiosulfate leaching-resin adsorption recovery was developed to efficiently extract gold from an oxide gold concentrate. ... Aylmore MG (2001) Treatment of a refractory gold-copper sulfide concentrate by copper ammoniacal thiosulfate leaching. Miner Eng 14(6):615–637.
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Copper Mineral Leaching Mathematical Models—A Review
The mining industry has traditionally operated in two ways: pyrometallurgy in the case of sulfide minerals, consisting of flotation, smelting and electro-refining processes; while ... the most used to model the copper leaching dynamics (and the leaching of other minerals) are the shrinking core models (SCM) and the progressive conversion models ...
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Copper Leaching Practices
The leaching operation comprises the introduction of a sulfuric acid solution containing varying amounts of ferrous and ferric sulfate onto the surface or into the interior of the dumps for the purpose of effecting the dissolution of copper minerals. The end product of the leaching operation … See more
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Frontiers | Mineral Leaching Modeling Through Machine …
Most of the copper ores on the planet correspond to sulfides and a small part to oxides (Hernández, 2013). The mining industry has traditionally operated in two ways, pyrometallurgy in the case of sulfide ores, consisting of flotation, smelting and electro-refining processes.
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A synergistic solvent extraction system for separating copper …
This process, consisting of chloride leaching, copper solvent extraction and electrowinning, and iron hydrolysis would have the following main features: ... Hydrochloric acid leaching provides faster leaching kinetics and higher copper recovery compared with sulphuric acid leaching; • Copper is readily separated from iron in the high chloride ...
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Pretreatment of Copper Sulphide Ores Prior to Heap Leaching…
The authors Moravvej et al. studied the effects of microwave irradiation as a pretreatment for sulphides and oxidized copper ores via leaching tests in shaking flasks, to later carry out a conventional leaching process, obtaining a copper extraction of 6.05% for sulphide copper ores without pretreatment and 8.17% with pretreatment, while for ...
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Recovery of Silver and Gold from Copper Anode Slimes
1. Roasting. Copper anode slimes are roasted at 600–800°C with sulfuric acid or oxygen, which depends on the composition of slimes. During the process, selenium is evaporated in the form of SeO 2 gas. Copper is present in the form of soluble copper sulfate, which can be removed with dilute acid or water leaching. 2.
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LEACHING OF A ROASTED COPPER SULFIDE ORE
As the roasting time and temperature increase, the leaching of copper will also increase. 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. ... Page 1 of 2 clear solution. A solution consisting of 6 % sulfuric copper. However, in the titration part ...
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Semiconductor-Microbial Mechanism of Selective …
As shown in Figures Figures2 2 and and3, 3, with the change of the solution potential, the leaching efficiencies of copper and iron ions are different obviously.Changes of potential have little effect on the dissolution of chalcocite. At 640 mV of solution potential, the leaching efficiency of Cu is more than 75%, while the leaching efficiency of Fe is …
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(PDF) Leaching behaviour of low-grade copper ore in the …
The kinetics of leaching processes consisting of solid and liquid phases are ... The kinetic model was used to indicate the effects of these parameters on copper leaching from malachite ore in ...
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Leaching of copper (I) sulphide by sulphuric acid solution …
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) …
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How copper dump leaching works
A widely used method for exploiting secondary sulphide copper deposits involve leaching the ore in heaps or dumps. In both instances, ore piles are irrigated with …
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Copper(II) Chelating Agents | SpringerLink
Copper is a malleable, ductile metal that has excellent heat conductive and electricity properties. It is also a metal resistant to corrosion (Rzadkosz et al. 2014; ICGS 2018) and exhibiting antimicrobial properties (Ochoa-Herrera et al. 2011).Copper can be found in the earth's crust as pure native copper or in combination with other elements …
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Ammoniacal Solvoleaching of Copper from High-Grade Chrysocolla …
The copper silicate ore chrysocolla forms a large potential copper resource, which has not yet been fully exploited, due to difficulties associated with its beneficiation by flotation and metallurgical processing. Direct acid leaching of chrysocolla causes silica gel formation. Therefore, in this work, the feasibility of solvometallurgical methods to leach …
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Bacterial consortium for copper extraction from sulphide ore consisting …
The economic extraction of copper from low-grade ores requires low-cost processing methods such as in situ, dump and heap leaching. Bacterially assisted heap leaching of low-grade copper sulphides is a developing technology that has been applied successfully for the extraction of copper from secondary sulphide minerals such as …
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Copper Mineral Leaching Mathematical Models A Review
Heap leaching mainly requires size reduction in order to maximize the leaching minerals interaction and the placement of an impermeable base to prevent leaching loss and the contamination of water bodies [8]. The heap leaching process came into use in the mid-20th century, when the former U.S. Bureau of Mines developed heap leaching technology to
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How copper dump leaching works
The rate of copper leaching in dumps is a product of the rate of fines generation and the rate of leaching of the fines. ... Being a secondary sulphide, or supergene ore, the main copper-bearing mineral was chalcocite (Cu 2 S), with the host rock consisting of quartz monzonite with vuggy silica alterations (Yáñez et al., 2007). Ore …
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Treatment of copper concentrates containing chalcopyrite and non
The leaching of the concentrate that contained 14.7% of copper and 5.0% of zinc for three leaching cycles (total duration, 5.75 h) allowed the obtainment of a leach residue containing 15.3 and 0. ...
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Leaching of Gold from an Oxide Gold Ore with Copper…
The capability of gold leaching using copper–tartrate–thiosulfate solutions is comparable to that of cyanidation, as well as the traditional copper–ammonia–thiosulfate leaching system at elevated temperatures. ... For each test, 25.0 g gold ore was first added to the beaker, and then 100-mL solutions consisting of the required amount of ...
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Copper Mineral Leaching Mathematical Models—A …
Mineral leaching is the key unit operation in metallurgical processes and corresponds to the dissolution of metals. The study of leaching is carried out in many …
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Solvent extraction of Cu, Mo, V, and U from leach …
The composition of the leach solution is chosen depending on the type of raw material subjected to leaching. These can be acids: H 2 SO 4, HCl, HNO 3; hydroxide: …
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Kinetics of copper leaching from direct-to-blister …
In continuous direct-to-copper smelting process these two steps are combined into one. The principal advantages of this process are: isolation of SO 2 …
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