leaching pper ammonia

(PDF) Ammonia Leaching: A New Approach of Copper Industry ...

Ammonia leaching is a promising method for processing low-grade copper ores, especially those containing large amounts of oxidized copper. In this paper, we study the effect of Si-containing ...

Ammonia Leaching: A New Approach of Copper Industry in ...

Dec 10, 2013 Ammonia and ammonium salts have been recognized as effective leaching agents in hydrometallurgical processes due to low toxicity and cost, easy recovery and high selective recovery of metals. New research findings on considerable advantages of leaching by these agents and elimination of problems associated with acid leaching have resulted in a new approach in the world to this method.

Novel treatment for mixed copper ores: Leaching ammonia ...

Ammoniacal leaching for dissolution of copper oxides. • The pH in leaching should be controlled between pH 9–10. • Ammonia leaching does not alter copper sulfides. • PLS precipitates with S or SO 2 to form CuS and/or Cu2S. • Excess sulfur (150–200%) is more suitable for precipitation of Cu. •

(PDF) Ammonia leaching in the copper industry: a review

The effect of copper and ammonia addition on gold leaching kinetics was studied in the present paper. It will be shown that when the solutions do not contain copper, the addition of ammonia ...

Ammonia/nitric Acid Leaching of Copper- Cobalt Oxidized Ore

the best leaching efficiency for copper, in their feasibility of copper leaching from an industrial sludge using ammonia solution. This present work will develop the effect of nitric acid/ammonia ratio on the leaching of rich - cobalt copper oxidised ore. It will also evaluate the effect of key parameters (time, ammonia concentration, and pH ...

AMMONIA LEACHING IN THE COPPER INDUSTRY: A REVIEW

Ammonia leaching was first used for recovery of non-ferrous metals such as copper from oxide ores or ores containing pure copper, but gradually the use of this technology was developed from more ...

(PDF) Treatment of a Copper-Rich Gold Ore by Ammonia ...

The ammonia–cyanide leach system was first patented over 100 years ago and stands out as a unique method of selectively leaching up to 90% Au and <1% Cu from oxidised copper–gold ores using ...

TREATMENT OF A COPPER - RICH GOLD ORE BY AMMONIA

improved to >90%. Similarly, the pretreatment of the ore by ammonia leaching was shownto lead to high gold extractions (98%), in subsequent cyanide leaching with significant reductions in the consumption of cyanide. This appeared to be linked with the ready dissolution/removal of copper during ammonia leaching.

Leaching of Malachite Ore in NH3-Saturated Water ...

Jun 24, 2004 In this study, the leaching kinetics of malachite [CuCO3Cu(OH)2], an oxidized copper ore, was investigated in water saturated with ammonia gas. In the experiments, the ammonia concentration of the solution, the particle size of the ore, the temperature, the stirring speed, and the solid-to-liquid ratio were chosen as parameters. It was determined that the leaching rate of malachite

Use of Ammonia Salts in Selective Copper Extraction from ...

Jun 03, 2020 The highest copper extraction efficiency was obtained in the leaching process that was conducted with the solutions obtained by mixing ammonia salts in the best conditions. Accordingly, as a result of 6 h of leaching at 30 °C in the presence of 22.5% NH 4 OH and 100 g/L (NH 4 ) 2 S 2 O 8 , 91.47% of the copper was transferred into the solution ...

Use of Ammonia Salts in Selective Copper Extraction from ...

The highest copper extraction efficiency was obtained in the leaching process that was conducted with the solutions obtained by mixing ammonia salts in the best conditions. Accordingly, as a result of 6 h of leaching at 30 °C in the presence of 22.5% NH 4 OH and 100 g/L (NH 4 ) 2 S 2 O 8 , 91.47% of the copper was transferred into the solution ...

Leaching of Malachite Ore in NH3-Saturated Water ...

Jun 24, 2004 In this study, the leaching kinetics of malachite [CuCO3Cu(OH)2], an oxidized copper ore, was investigated in water saturated with ammonia gas. In the experiments, the ammonia concentration of the solution, the particle size of the ore, the temperature, the stirring speed, and the solid-to-liquid ratio were chosen as parameters. It was determined that the leaching rate of malachite

COPPER(II) EXTRACTION FROM AMMONIA LEACH SOLUTION

Ammonia leaching of sulfide copper concentrates generate buffer type liquors (pH ranges from 9 to 10), because of the excess of ammonia and significant amount of ammonia sulfate as a leaching agent. Metals such as Cu, Ni, Co and Zn occur in ammonia systems as a cationic amminacomplexes. Alkalinity of the solution and free

Processing Copper-Gold Ores with Ammonia or Ammonia ...

A low grade copper flotation tailing from Telfer containing 1.2% Cu as chalcocite and cuprite and 5 gt-t Au was leached with ammonia, cyanide and ammonia-cyanide mixtures to extract copper and/or gold. Direct cyanidation extracted both copper and gold but consumed about 30 kgt 1 NaCN. Pre-leaching the tailing with an aerated ammonia solution containing...

Optimal Conditions for Ammonia Leaching of Copper ...

Ammonia leaching can be used in non-oxidative, oxidative and reductive leaching [16]. The ammonia leaching process is more environment friendly than conventional acid heap leaching, which uses sulphuric acid to dissolve copper and cobalt [11]. The reported difficulty encountered with the ammonia leaching approach, however,

DEVELOPMENT AND IMPLEMENTATION OF SOLVENT

Leaching of copper can be accomplished with ammonia solution in which metal such as copper is selectively extracted while restricting the dissolution of iron or manganese. Both metals can pose a real problem in the subsequent stages of hydrometallurgical processing -

Ammoniacal thiosulphate leaching of gold ore

concentration. The leaching is improved significantly at a particular ratio of ammonia to thiosulphate concentration and that ratio varies from ore to ore. Copper ions act as an oxidant and the gold dissolution increases substantially in the presence of them. The gold leaching is minimum in the presence of an inert

Leaching of gold and copper minerals in cyanide deficient ...

Fundamental studies recently published have shown that the addition of ammonia decreased the gold leach rate in the absence of copper, had little effect on the leaching of gold by Cu(CN) 3 2−, but does increase the leaching kinetics when the major cyanide species present is Cu(CN) 2 − (Jeffrey et al., 2002). The presence of copper(II) was ...

Eliminating Copper from Gold Ore

The copper and ammonia are recovered from the preliminary leach solution by distillation, the copper remaining as an oxide precipitate. The success of this process will depend largely upon the relatively complete solubility in ammonia of those copper minerals which dissolve in cyanide.

Recent Developments in Copper Hydrometallurgy

New Copper Products Copper powder technology yPotential replacement for cathode to rod ySpecialty copper powders Copper powder process reduces or eliminates the following: yManual harvesting of cathodes yCell cleaning yStainless blank repairs and replacement yStripping machines ySlippery or brittle cathodes Focused on reducing costs and improving

Leaching of copper from tailings using ammonia/ammonium ...

Aug 03, 2010 Abstract: The leaching of copper from the tailings of Baifang Copper Mine in Hunan province in China by aqueous ammonia/ammonium chloride solutions has been studied. The tailings belong to a low-grade and high-alkaline copper ore. The effect of leaching time, the concentration of ammonia, solid/liquid ratio and temperature were investigated.

Kinetic analysis of Cu and Zn dissolution from printed ...

The optimum leaching condition was at 313 K, 400 rpm agitation, in excess reagents (75 ml 2 M ammonia with 25 ml 17.5 M H 2 O 2 for 1 g dust) with efficient copper recovery. The kinetic model shows the reaction is chemical and mixed reaction controlled, with Cu and Zn complexation activation energies estimated to 47.39 and 33.12 kJ/mol ...

LEACHING OF MALACHITE ORE IN AMMONIUM SULFATE

ammonia leaching of oxidized copper ores, as the dissolution reactions happen at mildly acidic or basic conditions, some metal impurities, which pass into the solution during the dissolution of ore, precipitate because of the high pH of the solution. Besides, am-monia forms stable complexes with copper

Selective leaching of a copper ore by an electromembrane ...

Leaching of copper ores occurs by means of either acid leaching or ammonia leaching. It is known that acid leaching is not suitable for ores which contains carbonates such as covellite or limestone. In such case, ammoniac leaching is performed although it is often carried on with both high pressure and elevated temperature.

DEVELOPMENT AND IMPLEMENTATION OF SOLVENT

Leaching of copper can be accomplished with ammonia solution in which metal such as copper is selectively extracted while restricting the dissolution of iron or manganese. Both metals can pose a real problem in the subsequent stages of hydrometallurgical processing -

Processing Copper-Gold Ores with Ammonia or Ammonia ...

A low grade copper flotation tailing from Telfer containing 1.2% Cu as chalcocite and cuprite and 5 gt-t Au was leached with ammonia, cyanide and ammonia-cyanide mixtures to extract copper and/or gold. Direct cyanidation extracted both copper and gold but consumed about 30 kgt 1 NaCN. Pre-leaching the tailing with an aerated ammonia solution containing...

CA1153984A - Ammonia leaching - Google Patents

AMMONIA LEACHING Abstract-of 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 ...

Optimal Conditions for Ammonia Leaching of Copper ...

Ammonia leaching can be used in non-oxidative, oxidative and reductive leaching [16]. The ammonia leaching process is more environment friendly than conventional acid heap leaching, which uses sulphuric acid to dissolve copper and cobalt [11]. The reported difficulty encountered with the ammonia leaching approach, however,

Selective leaching of a copper ore by an electromembrane ...

Leaching of copper ores occurs by means of either acid leaching or ammonia leaching. It is known that acid leaching is not suitable for ores which contains carbonates such as covellite or limestone. In such case, ammoniac leaching is performed although it is often carried on with both high pressure and elevated temperature.

Leaching of copper from tailings using ammonia/ammonium ...

Aug 03, 2010 Abstract: The leaching of copper from the tailings of Baifang Copper Mine in Hunan province in China by aqueous ammonia/ammonium chloride solutions has been studied. The tailings belong to a low-grade and high-alkaline copper ore. The effect of leaching time, the concentration of ammonia, solid/liquid ratio and temperature were investigated.

Leaching - an overview ScienceDirect Topics

The copper content of the solution varies from less than 1 g/L to several grams per liter. Other leaching methods include ammonia leaching, which is used for certain copper oxide ores. These methods are called leach-precipitation-flotation and are applied to mixed sulfide ores.

Thiosulfate-copper-ammonia leaching of pure gold and ...

Thiosulfate-copper-ammonia leaching of pure gold and pressure oxidized concentrate 1081 Δ𝑓=−𝐶𝑓 Δ𝑚, (1) where C f is the sensitivity factor for the crystal used (56.6 Hz cm 2/µg), f is the frequency (Hz) and Δm is mass change (µg). A saturated silver-calomel electrode (Radiometer 401) SCE +0.241 V vs. SHE was

LEACHING OF MALACHITE ORE IN AMMONIUM SULFATE

ammonia leaching of oxidized copper ores, as the dissolution reactions happen at mildly acidic or basic conditions, some metal impurities, which pass into the solution during the dissolution of ore, precipitate because of the high pH of the solution. Besides, am-monia forms stable complexes with copper

Leaching Kinetics of Gold Involved in the System S2O32 ...

Thiosulphate gold leaching is an alternative technology to the cyanidation of gold ores. Ethylenediaminetetraacetic acid is referred to as EDTA.A study on the leaching kinetics of gold involved in the system S2O32--EDTA-Cu2+ for the gold in this paper. The effect of temperature and of the addition of copper has been also analyzed, temperature has a remarkable effect over the overall reaction ...

Oxidation and Cyanide as an Oxidation Catalyst in Pressure ...

The leaching section of the mill consists of two parallel circuits of eight series connected digesters, preceded by a preheat tank. ... Copper-Ammonia Complex – The use of copper-ammonia in the range of 2 pounds of copper sulfate and 8 pounds of NH3 per ton of ore did not enhance the extraction of uranium for the ores tested.

Adsorption of Copper Complexes on Anion Exchange Resin in ...

The leaching of copper using thiosulfate reagent as an alternative reagent to cyanide has been investigated . ... Hence, limiting the presence of oxygen and ammonia in the leach solution would be worthy to investigate the adsorption of copper complexes on anion exchange resins. Anion exchange resin

The selective leaching of copper from a gold–copper ...

ores with ammonia–cyanide, and their plant control and operation has been published by Muir (2011). The application 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

The treatment of copper-gold ores by ammonium thiosulfate ...

The application of ammonium thiosulfate for the treatment of copper-gold ores has been investigated. Leaching studies were conducted with copper minerals, copper minerals with gold addition to solution and copper-gold samples of different copper and gold grades. The behaviour of thiosulfate, tetrathionate and sulfate in solution was studied using ion chromatography. The copper sulfide minerals ...