Therefore, ammoniacal leaching can be applied for the recovery of copper from a variety of systems including flotation tailings, scrap metal, scrap brass and mattes ( Park et al., 2007; Sengupta et al., 2009 ). Ammonia in solid, liquid and gaseous states is …
In this research, the results for the dissolution of Mn and Cu from a black copper mineral are exposed, evaluating the reducing effect of NaCl for MnO 2 through pre-treatment of agglomerate and curing, and subsequently leaching in standard condition with the use of a reducing agent (Fe 2+ ). High concentrations of chloride in the agglomerate ...
Roasting exposed the concentrate to temperatures of 680°C prior to leaching with water and ammonia and ammonia–ammonium chloride. Alternatively, direct leaching was completed at 90°C, in which oxygen was injected in the ammonia–ammonium chloride leach. Results confirmed that copper can be …
Operation The Copper Chloride Leaching Process consists of the following main steps: Concentrate repulp Atmospheric chloride leaching Leaching residue thickening, filtration, wash, and stabilization Copper solvent extraction (conversion from chloride to sulfate) Silver recovery from raffinate Copper electrowinning Additional gold recovery circuit:
The solubilities of copper hydroxide Cu(OH) 2, copper oxide CuO, atacamite Cu(OH) 1.5 Cl 0.5, malachite Cu 2 (OH) 2 CO 3 and chessylite Cu 3 (OH) 2 (CO 3) 2 in …
In this study, a new hydrometallurgical recovery technology of leaching copper from waste computer mainboards (WCM) has been presented using ammonia-ammonium chloride buffering solution as leachant and hydrogen peroxide solution ( AR, 30% w/w) as oxidant. The influences of aqueous ammonia concentration, ammonium …
at different concentrations of ammonium hydroxide, ammonium carbonate, ammonium nitrate, ammonium chloride, and am-monium persulfate. The copper extraction …
Therefore, ammoniacal leaching can be applied for the recovery of copper from a variety of systems including flotation tailings, scrap metal, scrap brass and …
Alkaline leaching with highly selective ammoniacal complexing agents is an interesting alternative for the treatment of copper concentrates. This treatment is beneficial for copper recovery because it …
One of the biggest challenges for the gold industry in the 21st century is the presence of copper in gold containing ore bodies. This is because copper consumes large quantities of cyanide. In additi
Sulfidic copper–lead–zinc tailings can pose a significant environmental threat, ranging from generation of acid mine drainage (AMD) to dam failures. On the other hand, they can also be considered as… Expand 10 PDF View 1 excerpt, cites background
This paper reports on research work treating converter slag containing high percentages of copper (36 wt%) using ammonium hydroxide at room temperature. Variables analyzed are solution pH, agitation, temperature, NH 4 …
Ammoniacal/ ammonium salt leaching study With the aim of extracting copper selectively from the WPCBs, a leaching reagent perfectly needed to react specifically and only with copper and be inert to other metals. Copper ions, in solutions with acidic pH values, are stable and also form stable complexes at alkaline pH (6.5–11.0).
In this study, the atmospheric leaching method was applied to extract valuable elements, including copper, zinc, and copper oxide, from a polymetallic ore that was considered a tailing in the...
Deep recovery of copper: leaching with ammonium salt system. For recovery of copper in the copper concentrate, copper concentrate with different size was used as raw material of leaching, using environmentally friendly ammonium salt leaching system. 3 mol/L ammonia solution and 2 mol/L ammonium chloride solution were …
Deep recovery of copper: leaching with ammonium salt system For recovery of copper in the copper concentrate, copper concentrate with different size was used as raw material of leaching, using environmentally friendly ammonium salt leaching system. 3 mol/L ammonia solution and 2 mol/L ammonium chloride solution were …
The generally accepted chemistry for dissolving metallic copper in ammoniacal ammonium carbonate solution makes use of the reaction between cupric ammonium carbonate and metallic copper to oxidize the copper and form cuprous ammonium carbonate.
Reduced ore samples were obtained from the reduction roasting of a limonitic laterite. The extraction of nickel and cobalt from the reduced ore was conducted by selective chlorination in the temperature range of 300–500 °C using aluminum chloride hexahydrate as the chlorination agent, and followed by water leaching at 80 °C.
The production of metallic copper from low-grade copper ores is generally carried out by hydrometallurgical methods. Leaching is the first prerequisite of any hydrometallurgical process. Solutions containing ammonia may allow for selective leaching of the copper from the ore. In this study, the leaching kinetics of malachite, which is an oxidized …
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Discussion. The copper ion in the aqueous solution of exists predominantly as [Cu (H 2 O) 6] 2+. This complex ion imparts a characteristic pale blue color to the solution. Since ammonia is a weak base, when it is added, …
Results and Discussion 4.1 Dissolution of Cu in an ammonia solution containing ammonium sulfate In order to investigate a leaching behavior of copper, copper plates were immersed and stirred in a solution of 7 kmol m-3NH 3and 1 kmol m-3(NH4)2SO4containing 0.5 kmol m-3Cu(II) at 313 K.
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 …
In this study, we propose a novel temperature-programmed ammonium chloride (NH4Cl) roasting–water-leaching process to extract nickel (Ni), cobalt (Co), and copper (Cu) from polymetallic sulfide ...
Copper forms water soluble and very stable ammonia complexes - [Cu (NH 3 ) 4 ] 2+ and that is why it can be easily leached …
Abstract The leaching of copper from the tailings of Baifang Copper Mine in Hunan province in China by aqueous ammonia/ammonium chloride solutions has …
When concentrated ammonia solution (ammonium hydroxide) is added to a clear, light blue, aqueous solution of copper (II) chloride, a powdery, light blue precipitate of copper (II) hydroxide forms. Further addition of …
This study investigated the usage conditions of five different ammonia salts as leaching reactants for the purpose of selective extraction of copper from tailings.
chloride solution [13], complex copper in ammonia-ammonium chloride solution [14], malachite ore in ammonium nitrate solutions [15], tenorite and cuprite in ammonium media [16,17]. Ammonia leaching has not been carried out for converter slags. Therefore, the main objective of this research work is to leach a slag from a Peirce-Smith converter ...