(PDF) Improved Copper/Iron Selectivity in Solvent Extraction …
Copper Leaching, Solvent Extraction, and Electrowinning Technology, 2nd ... [11,12] prior to discharge into the natural water receiving bodies. ..... They were able to recover the 80% of Cu(II ...
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it F erroox idans
Representative chemical reactions involved in the leaching of copper ore. Oxidation of Elemental Sulfur 2S0 + 302 + 2H 2O ? 2H2 SO4 7 Leaching of Copper Oxide Ores Cu3 (OH) 2(CO 3)2 + 3H2SO4- 3CuS04 2 2 ... Prior to initiating the leaching proc-ess, the mine tailings are piled into dumps over water impermeable sur-faces. These dumps may be …
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Acid curing and agglomeration for heap leaching
The effect of curing time as a function of copper extraction prior to leaching was evaluated using different concentrations of sodium chloride (NaCl), potassium nitrate (KNO 3) and sulphuric acid (H 2 SO 4). A 23% copper dissolution was obtained prior to leaching using 25 kg/t NaCl, 15 kg/t H 2 SO 4 and 15 days of curing time.
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Acid leaching of oxide-sulfide copper ore prior the …
Reduction of "oxide copper", by acid leaching prior the flotation concentration, can increase the overall copper efficiency up to more than 70% in the single-stage leaching, achieving an ...
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Metals | Free Full-Text | The Effects of Sulphuric Acid and
An option to improve the leaching efficiency of chalcopyrite is pretreatment prior to leaching. Pretreatment variables, such as the curing time and the addition of chloride, can increase the kinetics of copper extraction, particularly for sulphide ores. However, there has been little research on the topic. The reactions that govern this …
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Towards fundamentally based heap leaching scale-up
Heap leaching is broadly used chiefly for the copper, uranium and gold extraction (Ghorbani et al. (2016). Staden and Petersen, (2021) proposed procedure for the scaled up laboratory column ...
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WO2015031943A1
Prior art keywords copper leaching gold precious metal glycine Prior art date Application number PCT/AU2014/000877 Other languages French (fr) Inventor Jacobus Johannes EKSTEEN Elsayed Abdelrady …
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Processing of chalcopyrite ore by heap leaching and flotation
Chalcopyrite ore was obtained from the Quebrada Blanca mine in northern Chile. The ore contained 0.52% copper, with > 95% of that copper being present as chalcopyrite.Prior to use, the ore was crushed to − 13 mm, resulting in a P 80 of 11.4 mm and a fines (− 150 μm) content of 4%. Table 1 details the chemical composition and …
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How copper dump leaching works
1. Introduction. A widely used method for exploiting secondary sulphide copper deposits involve leaching the ore in heaps or dumps. In both instances, ore piles …
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Copper Leaching Practices
Copper in the Western United States is produced from low-grade ore bodies found predominately in igneous host rocks, chiefly quartz monzonite, quartz porphyry, monzonite … See more
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Pretreatment of Copper Sulphide Ores Prior to Heap …
This study presents a review of various pretreatment methods prior to heap leaching to aid in the dissolution of copper from sulphide ores. Different variables of …
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Ammoniacal Solvoleaching of Copper from High-Grade Chrysocolla …
The dissolution of these carbonate minerals consumes large volumes of acid. Therefore, leaching of copper from chrysocolla under alkaline conditions has also been explored [16,17,18]. Habashi and Dugdale proposed pre-heating (at 500–600 °C and inert atmosphere) prior to ammoniacal leaching for the recovery of copper from chrysocolla .
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Pretreatment of copper ore prior to heap …
research copper ores (copper oxide and copper sulfide ores) were crushed by a jaw crusher and by HPGR and the products evaluated for particle damage, as well as by …
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In situ leaching of copper: Challenges and future …
We review pilot and commercial in situ leaching of copper. • We include a table of key variables from previous operations. • We review challenges with flow …
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Producing Copper Nature's Way: Bioleaching
The "Gall-Copper Process" was recorded as being used during the Song Dynasty (960-1271AD). Copper was precipitated from solution by dipping iron into the blue vil solution - a process identified as early as 150 BC …
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LEACHING OF COPPER CONCENTRATES
copper oxides have been in common use for some time. Prior to the development of the Sherritt-Gordon process for nickel and cobalt in which copper is recovered as high grade …
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Precipitation of copper from cyanide leach solutions using …
To eliminate the interference of copper with cyanide leaching, various pretreatment options including flotation, pre-leaching (acid or alkaline) and pre-aeration were tested for the selective removal of copper prior to cyanide leaching (Bas et al., 2012, Bas et al., 2015; Yazici et al., 2015).
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Selective leaching of copper and zinc from primary …
Copper leaching was the result of local corrosion and differences in leaching against the synthetic (NH 4) 2 CO 3 control could be accounted for by pH shifts from …
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Leaching of Copper Ores: Effects of Operating Variables
A maximum copper dissolution of about 87 % can be recovered at a leaching temperature of 45 oC, 462 m particle size, 0.2 N hydrochloric acid, 1.0 g/L solid to liquid ratio, and 1000 rpm stirring ...
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Recovery of valuable metals from copper slag | SpringerLink
2.2.1 Sulfation roasting–water leaching. Prior to the sulfation roasting process, 50 g ground copper slag powder was placed in a porcelain crucible, and then uniformly mixed with the desired 98% sulfuric acid. ... To achieve a high copper leaching rate, the addition of sulfuric acid must exceed 70 wt%. Given these considerations, 80 …
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Pressure Leaching of Copper Slag Flotation Tailings in …
No sulfur (S) peak was detected by XPS because of the high flotation recovery of sulfide minerals in the copper slag prior to leaching (Figure Figure1 1). For this reason, copper, cobalt, and zinc in the flotation tailings were mostly in …
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Microbiology Research | Free Full-Text | Options for …
In the present work the effect of alkaline sulfide leaching (ASL) on the extraction of copper and zinc from low-grade copper concentrate containing chalcopyrite, tennantite, sphalerite, and pyrite during batch and continuous bioleaching experiments was studied. It was demonstrated that ASL and further bioleaching may be a promising …
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Recovery of Copper by Solution Mining Methods
prior to applying a leaching solution to liberate a desired ... Copper as well as a number of other commodities are harvested by solution mining methods. Water-soluble salts such as potash (sylvite), rock salt (halite), thenardite (sodium sulfate) and nahcolite (sodium bicarbonate) are commonly derived from massive sedimentary deposits by
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Progress in bioleaching: part B, applications of microbial …
Copper leaching with chloride has several positive advantages when compared to sulfate-based ... BioPro™ was applied to refractory ore in an "on/off" leach pad cycle that required removal of the biooxidized ore prior to neutralization and subsequent cyanidation to recovery gold. Interestingly, this operation also experienced extremes of ...
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Treatment of a Copper Rich Gold Ore by Ammonia …
This appeared to be linked with the ready dissolution/removal of copper during ammonia leaching. Keywords: ammoniacal cyanide leaching, pre-treatment, lead nitrate, copper-gold ore, gold ... These findings suggest that ammonia kg prior to pretreatment cyanidation of gold can be suitably used for copper-bearing refractory gold ores as also noted ...
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Copper Recovery from Printed Circuit Boards Using …
In this work, exploratory tests on copper electrowinning was carried out directly in the ammonia leaching solutions, without any prior purification treatment, despite their low copper concentrations. The experimental leaching conditions to produce the pregnant leaching solutions were: 500 rpm; L/S ratio of 20; 2 times the stoichiometric …
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Hydrometallurgical considerations in processing arsenic …
Bench pressure cyanidation of the copper pilot residues confirmed that up to 90% silver extraction was feasible, with extractions being sensitive to the upstream copper leaching conditions. Arsenic precipitation within the leaching vessel in most cases was >97% and the factors influencing final arsenic in the leach filtrate are presented.
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In situ leaching of copper: Challenges and future prospects
This review includes a discussion of lessons from past commercial and experimental copper ISL work, with a focus on leaching without prior fragmentation. A review of this topic is important at this time because over 30 years have passed since the last comprehensive compilation of data from copper ISL projects (Ahlness and Pojar, …
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Management of Copper Heap Leach Projects: A Geologist's Perspective
Copper production by heap leaching, coupled with solvent extraction and electrowinning (SX-EW), is a well-established technology, with an annual output of about 3.7 million tonnes (Mt) of copper metal. Ores presently amenable to copper heap leaching include copper oxides and secondary copper sulfides. Most copper deposits amenable …
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A Review of the Cyanidation Treatment of Copper-Gold …
Separating high-copper-containing ores selectively prior to the leaching process is an option in order to reduce the impact of the copper content. For example, the Red Dome Mine in Australia selectively mines and …
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