Leaching Method. The support rock itself may be a lowgrade copper ore. The ratio of support rock to concentrate is in the range of 5:1 to 10:1 by weight. The heap is inoculated with thermophilic bacteria and a process leach solution consisting of sulfuric acid, ferric iron and nutrients is applied to the heap.

Ammonia leaching for the removal of copper was performed at 1 mol/L NH3 and the cyanide leaching of the residue was carried out at g/L NaCN. The reactors were agitated by overhead stirrers at a constant stirring speed of 600 r/min. Air was supplied to the reactors at a flow rate of 2 L/min.

After ammonia traditional cyanide leaching, ammonia cyanide system pretreatment of the tailings with mol/L NH3 + allows selective leaching of gold from coppergold ores mol/L NH4+, which resulted in a copper extraction of with remarkably reduced consumption of cyanide [18].

Leaching can be divided into two types, namely, acid leaching and ammonia leaching [7,8], named after the leaching agent employed. Acid and ammonia leaching are suitable for treating the copper oxide ores, which have acidic silicate and carbonate alkaline gangues, respectively.

rather than leaching both gold and copper followed by cyanide and copper recovery. One of these applications is the cyanide–ammonia process to leach gold over copper from oxidized ores which has been applied for over a century in the treatment of different gold–copper ores (Muir, 2011). The cyanide–ammonia system to leach gold over copper from oxidized ores has been studied using

USA US46167A USA USA US A US A US A US 46167 A US46167 A US 46167A US A US A US A US A US A US A Authority US United States Prior art keywords copper ammonia ore leaching steam Prior art date Legal status (The legal status is an assumption and is not a legal conclusion.

Many of these problematical goldcopper ores could possibly be processed economically for gold recovery using a novel ammoniacal cyanide leaching system which utilises a copperammoniacyanide complex as an effective lixiviant for gold, yet limits copper dissolution and conserves cyanide.

Atmospheric pressure leaching application for the recovery of copper and nickel from lowgrade sources 257 Material characterization Copper tailings samples from Nchanga in the Zambian Copperbelt region and lowgrade nickel ore from Waterval Boven in the Mpumalanga Province of South Africa were used in the test work. The samples were supplied by

Abstract: The leaching kinetics of copper from lowgrade copper ore was investigated in ammoniaammonium sulfate solution with sodium persulfate. The effect parameters of stirring speed, temperature, particle size, concentrations of ammonia, ammonium sulfate and sodium persulfate were determined.

May 01, 2011· Read "A review of the selective leaching of gold from oxidised copper–gold ores with ammonia–cyanide and new insights for plant control and operation, Minerals Engineering" on DeepDyve, the largest online rental service for scholarly research with thousands of academic publications available at your fingertips.

copper scrap leaching ammonia · By this step of leaching copper values with aqueous ammonium carbonate at elevated temperatures in the presence of an oxygencontaining gas, an aqueous leach liquor is obtained containing ammonia complexes of copper carbonate, principally Cu(NH 3) 4 CO 3, and ammonia complexes of copper sulfate, principally Cu(NH 3) 4 SO 4.

An extensive literature survey on the principles and applications of ammonia leaching processes in hydrometallurgy is presented in this paper. The combination of ammonia anal ammonium salts is known to be a powerful lixiviant used in hydrometallurgical processes. Many metals can be extracted using the mixture of ammonia/ammonium.

copper mining and processing – from mine to copper plate. information on copper mining and copper processing . The above flowsheet shows a basic copper mine process, from mine to metal. »More detailed. leaching tank in plant copper extraction agitation. ammoniaammonium chloride .

These procedures were the toxic characteristic leaching procedure (tclp), the extraction procedure toxic test (ep tox), and method 1312 (m1312). Tclp and ep tox use acetic acid; m1312 uses a 6040 mixture of sulfuric and nitric acids. Samples from mill tailings from 12 mines located in 5 different Western States were used in the tests.

Pretreatment of the ore by ammonia The evaluation of the experimental data using leaching is found to remove reactive copper (73%), dissolution of copper as the response shows that leading to ready extraction of gold (%) in subsequent increasing the concentration of NaCN and NH3 has a cyanide leaching even at low cyanide levels ( g/L positive synergistic effect on the dissolution of copper .

Copper Leaching Insitu Acid Production Oxide ore Underlying secondary and primary ore FLOTATION Leach Circuit Flotation Tailings Oxygen Acid HEAP LEACH SX/EW Raffinate to Leach Raffinate to Heap Leach Freeport's Morenci and Bagdad POX plants Generate excess acid in leaching circuit for oxide leach

copper SXEW in order to make LME Grade 'A' specification. The copper flotation step is inherently inefficient for cobalt, with recoveries typically from 40% for oxides up to 80% for sulphides, so there is a substantial amount of cobalt contained in tailings dams that could be recovered – .

Bacterial Leaching. On investigation it was found that naturally occurring bacteria were oxidizing iron sulfides and the resulting ferric sulfate was acting as an oxidizer and leachant for copper sulfides. These bacteria were given the name ferrooxidans for their action in oxidizing iron sulfides.

The first option in this cate that about 20% of all gold deposits have significant copper miner gory is the selective leaching of copper prior to cyanidation alization commonly associated with chalcopyrite, tetrahedrite, for gold using reagents such as dilute acid, iron(III), cop tennantite, as well as bornite and chalcocite in certain ores (Muir per(II)/chloride or ammonia (Muir et al., 1989).

easily been leached by using ammonia at atmospheric condition. Ammonia leaching is also selective in that it will not dissolve all available nonspecific metals, such as iron and manganese, along with the copper or cobalt, as sulphuric acid does. More Ammonia leaching can be used in nonoxidative, oxidative and reductive leaching [5].

In this study, the leaching effect of copper oxide ore was investigated using ammonium chloride solution as leaching agent. The effects of temperature, concentration of ammonium chloride, average particle size and stirring speed on the leaching of copper oxide ore were investigated.

tailings, but also other valuable metals from flotation tailings by cupric chloride leaching. Experiments were conducted to determine the effect of cupric and chloride ion concentrations on the dissolution of gold, copper, nickel, cobalt, zinc, and iron. 2 Materials and Methods In this study, the raw material investigated was flotation tailings.