advantage of leaching in ammonia is lower equipment costs because ammonia is less corrosive than acid. The feed material used in this study was an oxidised coppercobalt ore sourced from Katanga Region in the DRC. A size fraction analysis was undertaken in order to determine the deportation of the copper and cobalt metals in the feed material. In the leaching tests conducted, the effect of ...

The appliion of cyanide–ammonia system to leach gold over copper from oxidised ores has been tested successfully using different gold–copper ores (Drok and Ritchie, 1997; La Brooy et al., 1991; Muir et al., 1989). However, this system in the treatment of transition or sulphidic ores gave poor gold recovery and required higher reagent concentrations (Muir, 2011). Moreover, both cyanide ...

AMMONIA LEACHING Abstractof the Disclosure An improved process for obtaining copper from a copper sulfide, in which: the copper sulfide is treated with oxygen and an aqueous leaching solution of ammonium carbonate, to form a leach liquor which contains ammonia complexes of copper sulfate and copper carbonate; the leach liquor is heated to form gaseous ammonia and carbon dioxide; the leach ...

the temperature and the reaction involved on the leaching of coppermatte. Copper (Cu) bearing matte from Impala Refinery (Pty) Ltd was used in the investigation. The experiments were conducted in a leaching cell submerged in a water bath, with ammonia concentrations (leaching solution) of, temperature of 50˚C, 60˚C and 70˚C, pH of 11 and for a time period of 130 minutes. Leaching ...

 · The temperature and stirring speed had the most pronounced effect on the copper leaching, whereas ammonia affected the leaching yield at low concentrations of ammonia. It was found that 78 pct of Cu could be extracted within 4 hours and under optimum conditions: T = 343 K (70 °C), 2M ammonia, pH, stirring speed = 900 rpm, pulp density = 10 pct (w s/v). The kinetic data were analyzed with ...

 · Ammonia leaching seems to be attractive for processing copper slag. Under the influence of ammonia, copper, which is part of the minerals of copper, forms soluble ammonia complexes, while iron precipitates as insoluble compounds. In the present work, the possibility of leaching the copper smelter slag ( wt.% Cu) of the Balkhash smelter using NH4OH solutions was considered. The .

 · Ammonia has already been established as an effective complexing agent for transition metals such as copper, nickel, cobalt, silver, and platinum. It has a number of inherent advantages as a ligand due to its low cost, low toxicity, low corrosivity, easy regeneration due to its low vapor pressure and above all good complexing ability. It is possible to dissolve gold in ammonia solution at room ...

leaching, ammonia leaching has the merits of high selectivity over gang minerals, low corrosivity and appliion in alkaline conditions [8]. MUIR et al [8] demonstrated the removal of copper (up to 95%) from an oxidised tailings via ammonia leaching, which resulted in a substantially reduced reagent consumption (from 30 kg/t to 6 kg/t NaCN) in the subsequent cyanide leaching. Despite its ...

Deutsch, Jared L., Dreisinger, David B., Silver Sulfide Leaching with Thiosulfate in the Presence of Additives Part I: CopperAmmonia Leaching, Hydrometallurgy (2013), 137, 156164. Deutsch, Jared L., Dreisinger, David B., Silver Sulfide Leaching with Thiosulfate in the Presence of Additives Part II: Ferric Complexes and the Appliion to Silver Sulfide Ore, Hydrometallurgy (2013), 137, 165172.

 · In another example, LIX 54 is used as the extractant for copper from a leach liquor derived from the ammonia leaching of copperlead dross. LIX 54 was designed for the extraction of copper from ammoniacal leach liquors. Its ease of stripping, low ammonia loading, fast kinetics, good phase separation, high copper loading, and low viscosity when fully loaded, make it ideally suited for this task ...

ammonia leaching of copper; product list. K Series Mobile Crushing Plant; Mobile Vibrating Screen; Belt Conveyer; Sand Washing Machine; S5X Series Vibrating Screen; GF Series Vibrating Feeder; Ball Mill; Raymond Mill; MW Series Micro Powder Mill; T130X Superfine Grinding Mill; MTW Trapezium Mill; LM Vertical Mill ; 5X Pendulum Roller Mill; VSI6X Series Vertical Crusher; Impact Crusher ...

in the solution, while ammonia and copper accelerated the leaching reaction. The oxidation state of copper in the thiosulfate leaching solutions are of the critical importance for the silver leaching process. Moreover, it is necessary to keep the proper molar ratio of ammonia to thiosulfate to enhance the leaching. To the contrary, the copper might be stabilized in Cu(I) and Cu(II) oxidation ...

Arbiter Plant Anaconda Montana, USA Undertook process design and startup of SX plant to recover copper from ammonia leach solution (197274) Chingola SX Project NCCM, Zambia Supervised process design for world's largest (then) copper SX project and associated pilot plant (1970) Return to Project List. Latest News Articles . Call for Papers. We are now receiving abstracts for ALTA ...

Ammonia leaching as a process ahead of cyanidation was also examinedpretreatment . Some additives were testedto reduce the copper interferences. Direct cyanide leaching of gold was carried out for comparison. EXPERIMENTAL . Ore sample . The ore sample was obtainedfrom Mastra Gold Mine, loed in Gümüşhane, Turkey. The sample was crushed to 4 mm by using a jaw and then a roll crusher. The ...

copper Pregnant Leach Solution (PLS), obtained via ammonia leaching of bottom ash, is reported to the solvent extraction (SX) section, where copper is recovered and hode copper is produced in the electrowining (EW) circuit using stainless steel blanks. The solvent extraction section consists of 4 (four) mixersettler units: 1 (one) for extraction, 2 (two) for washing and 1 (one) for ...

An improved process for obtaining copper from a copper sulfide, in which: the copper sulfide is treated with oxygen and an aqueous leaching solution of ammonium carbonate, to form a leach liquor which contains ammonia complexes of copper sulfate and copper carbonate; the leach liquor is heated to form gaseous ammonia and carbon dioxide; the leach liquor is treated with a strongly alkaline ...

 · Chmielewski T, Wódka J (1997) Recovering of silver and copper from silverbearing waste slag by ammonia leaching. Physicochem Probl Miner Process 31: 5161. [21] Ochromowicz K, Jeziorek M, Wejman K (2014) Copper(II) extraction from ammonia leach .

 · In addition to this the chemistry of the thiosulfate – ammonia – copper(II) ion system is complied due the simultaneous presence of the Cu(NH 3) 4 2+ /Cu (NH 3) 2 + redox couple and thiosulfate complexes of silver and copper. A critical comparison of the existing methodologies for the leaching and recovery of silver from different sources has recently been presented in a review article ...

In ammonia leaching cobalt extraction generally does not exceed 50%, whereas copper and nickel recoveries in excess of 85% are achieved. Since manganese nodules possess high specific surface areas, the poor cobalt recovery may be related to the presence of finely divided leach residues. Adsorption experiments have been conducted to investigate the of pH. The manganeserich phase has a stronger ...

Aqueous ammonia as a leaching abundant source of sulfide copper in the earth's crust; agent is fairly noncorrosive and leaching reactions occur and 2) it is one of the most refractory sulfide copper in relatively mild conditions [9]. The best known minerals [1]. At present, about 70% of the world's copper appliion of direct reaction of ammonia and sulfide production is carried out from ...

An increase in the leaching time resulted in more copper being leached for all lixiviant concentrations. However, leaching with 2 M ammonia solution gave a higher yield of copper compared to higher concentrations. This anomaly could be a result of cementation; Cu is displaced by Ni as Ni is a more electronegative metal than Cu .It was found that at higher concentrations more nickel was ...

In this process, ammonia leaching of sulfide minerals of copper, nickel, cobalt and iron was conducted at a. temperature of about 105 °C and air pressure of 8 ATM. Under these c onditions, copper ...