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leaching of refractory copper ore

Leaching characteristics of copper refractory ore in ...

2011-11-1 · Several researchers have reported that the recovery of copper from CRO material by an acid-leaching process is not economically feasible, due to the presence of excess gangue-acid-consuming minerals such as calcites, dolomite, asbolane and iron oxides.

Advances in high-temperature heap leaching of

2012-12-13 · in the ore is therefore of primary importance, as well as the need to generate suitable Advances in high-temperature heap leaching of refractory copper sulphide ores by S.W. Robertson*, P.J. van Staden*, and A. Seyedbagheri* Synopsis Acid heap leaching has

Leaching characteristics of copper refractory ore in ...

In this study, the influence of NH4HF2 activation on the leaching of low-grade complex copper ore in NH3-NH4Cl solution was studied. The related thermodynamic, optimization, and kinetic studies ...

Copper Leaching from Refractory Flotation Tailings

2018-4-18 · copper sulfide and free oxidation copper in the raw ore were recycled by flotation, but the other refractory copper oxides, mainly the combination copper oxide, were not thoroughly recycled and the majority were lost in the tailings. As is typical for flotation tailings containing silicate gangue minerals, high temperature leaching was used [12].

A hybrid leaching process to enhance the dissolution of ...

Chingola refractory ore (CRO) is known to exhibit low, unsatisfactory leach efficiency under conventional leaching • The hybrid leaching process can effectively leach the refractory cupriferous micas in the CRO under ambient conditions. • Agglomeration, acid curing and column leaching of the CRO enhanced overall copper dissolution to 60% •

Extraction of Copper from a Refractory Copper Oxide Ore

The study aimed to extract copper from copper oxide ores in which copper minerals had a complex association and dissemination with gangue minerals in the form of fine grain by catalytic oxidation acid leaching. Based on the research on the properties of the material and lots of experiments, the leaching process was performed. The optimum parameters of leaching process were determined as ...

INVESTIGATION OF THE AMENABILITY OF A COPPER

2020-12-24 · In this study, the amenability of a copper-rich gold ore (108 g/t Au, 1.60% Cu) to cyanide leaching was investigated. Direct cyanide leaching of the ore showed that the gold extraction was very low by 18.4% over 24 h., indicating that the ore is highly refractory.

Refractory copper ore from Nchanga, Zambia: A materials ...

Experimental investigation was conducted on a low-grade copper ore in Tajikistan with grade of 0.89% and oxidation rate of 99%, which belongs to refractory oxide copper with low-grade and high ...

(PDF) A STUDY OF LEACHING OF COPPER OXIDE ORE BY

The results show that recoveries of 98.17 % copper, 84.68 % cobalt, and 37.99 % iron can be obtained using experimental optimal conditions of 1 h leaching period at a temperature of 70 oC with a...

(PDF) Cyanidation of Refractory Gold Ores: A Review

In this paper, the effect of the oxidative pretreatment and lead nitrate addition on the cyanidation of Zarshuran refractory gold ore containing 3.32 ppm Au, 1.09% As, and 0.5% sulfur were ...

Leaching characteristics of copper refractory ore in ...

2021-8-11 · Refractory copper ores (CROs) in central Africa contain copper minerals that are locked up in a micacious solid matrix or associated with carbonate, sulfide and phosphate minerals. Several researchers have reported that the recovery of copper from CRO material by an acid-leaching process is not economically feasible, due to the presence of excess gangue-acid-consuming minerals such as

Research on Reinforcing Acid Leaching of a Refractory ...

The characteristics of Yangla copper oxide ore and acid leaching of this copper ore were investigated. The results indicate direct dump acid leaching of raw ore is not feasible for the treatment of this copper ore in practice. Sieve sizing-warming-stirring-acid leaching process was employed for the treatment of the fine grain materials below 1m, while 66.19% copper leaching efficiency and10.92 ...

A hybrid leaching process to enhance the dissolution of ...

Chingola refractory ore (CRO) is known to exhibit low, unsatisfactory leach efficiency under conventional leaching • The hybrid leaching process can effectively leach the refractory cupriferous micas in the CRO under ambient conditions. • Agglomeration, acid curing and column leaching of the CRO enhanced overall copper dissolution to 60% •

A HEAP LEACH FEASIBILITY STUDY FOR MIMBULA

2019-8-19 · The ore considered for heap leach is CRO which comprise of Mimbula, Kakosa, to mention but a few. Studies done on Mimbula ore have been on agitation leaching, high temperature and pressure leaching, treatment of refractory copper ore (TORCO) process. However, these leaching methods

Ultrasound-intensified Leaching of Gold from a Refractory

The effect of ultrasound on the acid leaching of copper from copper converter slag, 15) ammonium leaching of zinc from calamine 16) and dissolution of colemanite in sulphuric acid 17) have been investigated. The aim of this study was to investigate the effect of ultrasonic energy on the leaching of gold from the refractory gold ore.

Response Surface Methodology for Optimization of

2018-4-18 · copper sulfide and free oxidation copper in the raw ore were recycled by flotation, but the other refractory copper oxides, mainly the combination copper oxide, were not thoroughly recycled and the majority were lost in the tailings. As is typical for flotation tailings containing silicate gangue minerals, high temperature leaching was used [12].

Leaching Guide of Refractory Gold Ore - cnlitereagent

2020-2-28 · 1.What Is Refractory Gold Ore? With the development of beneficiation technology, the definition of refractory gold ore is changing. Generally speaking, refractory gold ore in leaching field is a kind of ore whose leaching rate of gold is less than 80%

Atmospheric pressure leaching application for the

2013-8-20 · Copper tailings samples from Nchanga in the Zambian Copperbelt region and low-grade nickel ore from Waterval Boven in the Mpumalanga Province of South Africa were used in the test work. The samples were supplied by Konkola Copper Mine and Bohlaba Mines Ltd, respectively. Experiments for copper leaching were conducted on raw

Likely scenarios in the microbial leaching of gold from ...

A pyritic sample obtained from the tailings of a sulfide copper-zinc ore flotation plant (Au:1.15 g/t) and a carbonaceous-argillaceous slate (CAS) sample (Au:2.17 g/t), were examined to extract the gold using microbial leaching (Daibova et al., 2019). The researchers bioleached the gold by the separate “stimulation of the natural microbiome ...

Refractory Gold Ore Treatment Methods

2016-7-14 · Metallurgical ContentGold Leaching & Processing of Arsenic OreMispickel (Arsenopyrite: FeAsS).6Leaching and Recovering Gold from Antimony MineralsStibnite (Antimony Sulphide, Sb2S2)Telluride Gold Ore ProcessingSolubility of TelluridesGold Extraction from Carbonaceous OreList Gold Refractory

Chlorination Leaching of Refractory Ores -

2021-8-12 · Chlorination leaching of floatation concentrate could be a route for treatment of refractory ores instead of roasting, BIOB or POX - some companies are also testing fine grinding and oxygen injection using shear reactors in alkaline cyanide systems. Direct leaching of ores becomes very expensive using chlorine systems.

"Refractory Copper Ore from Nchanga, Zambia: A

The Nchanga Cu-Co ore deposit of the Zambian Copperbelt, is hosted in Neoproterozoic siliciclastic-carbonate sedimentary rocks, and it consists of two orebodies: the Lower Orebody (shale) and the Upper Orebody (arkose). Refractory Cu ores present in the Upper Orebody comprise 150 Mt with average 0.87% Cu, and are characterized by inadequate recovery of copper by leaching.

Gold & Copper Bioleaching - 911 Metallurgist

2015-2-28 · A commercial application of this bacterially-assisted leaching technology would involve injection of the ferric sulfate solution into the ore deposit where it dissolves the copper. The pregnant leach solution would then be pumped to the surface where the copper

Characterization and kinetic study on ammonia leaching

2014-6-3 · sulfide mineral studied for copper extraction from sulfide ores. This is mainly due to two reasons: 1) it is the most abundant source of sulfide copper in the earth’s crust; and 2) it is one of the most refractory sulfide copper minerals [1].At present, about 70% of the world’s copper production is carried out from chalcopyrite ore through

Atmospheric pressure leaching application for the

2013-8-20 · Copper tailings samples from Nchanga in the Zambian Copperbelt region and low-grade nickel ore from Waterval Boven in the Mpumalanga Province of South Africa were used in the test work. The samples were supplied by Konkola Copper Mine and Bohlaba Mines Ltd, respectively. Experiments for copper leaching were conducted on raw

Processing of Konkola copper concen- trates and

2009-8-27 · Processing of Konkola copper concentrates and Chingola refractory ore year. Reserves are sufficient for a life of mine in excess of 30 years. This paper describes the testwork and engineering studies undertaken to examine the potential for treating KDMP’s copper sulphide concentrates by

(PDF) Application of Diagnostic Leaching Technique for ...

Characterization of refractory behaviour of complex gold/silver ore by diagnostic leaching By ibrahim alp Alkaline sulfide pretreatment of an antimonial refractory Au-Ag ore for improved cyanidation

(PDF) LEACHING OF A ROASTED COPPER SULFIDE ORE |

LEACHING OF A ROASTED COPPER SULFIDE ORE Rosselle Kim P. Castillano, Wilfredo T. Gatdula Jr., Gin Derick L. Magno, Jhunalyn H. Parantar METE 157N: HYDROMETALLURGY LABORTORY ABSTRACT Sulphide ores of copper are insoluble in dilute sulphuric acid leaching solutions, but a very high extraction can be obtained if the copper ore is in the oxidized condition.

Characterization of refractory behaviour of complex gold ...

2009-6-10 · leaching tests were also performed to shed light on the refractory characteristics of ore. The leaching tests show that the extraction of gold and silver is consistently low, i.e. ≤47% and ≤19.2%, respectively, over a leaching period of 24 h.