The recycling of Cu from WPCBs has attracted increasing attention during the last two decades [5,6]. As a more sustainable process, ammonium salts ((NH 3 ) 2 SO 4, (NH 3 ) 2 CO 3 and NH 4 Cl) and ...
An alternative system to cyanide as a leaching agent is presented for the recovery of gold and silver from cyanicide minerals. These minerals are characterized by the presence of copper and carbonaceous minerals in their composition, therefore increasing both the consumption of reagents and energy requirements for the …
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 ...
Fig. 1 shows that the most critical variable was the solid concentration in the leaching solution, wherein the copper extraction rate increased by 23% (for similar pH values and NH 3 level). This coincides with several investigations, which showed that the lower the S/L ratio, the higher the kinetics of copper dissolution. The more significant …
DOI: 10.1016/j.mineng.2023.108418 Corpus ID: 263281019; Selective extraction of nickel and cobalt from disseminated sulfide flotation cleaner tailings using alkaline glycine-ammonia leaching solutions
Thus, in this study, to recover valuable metals and reduce pollution, a cleaner metal extraction method from copper sulfide tailings using a combined leaching …
By addition of ammonia and oxygen, metallic copper and copper oxides are Fig. 3 Ammonia leaching of tailings (leaching time 120 min, solid/liquid ratio 1/10, a 20 °C; b 30 °C; c 40 °C; d 50 °C; e 60 °C) Mining, Metallurgy & Exploration As seen in the figure, with the increased concentration of ammonium hydroxide, there was a significant ...
Heap leaching generates a pregnant leach solution (PLS) containing 1–6 g/L Cu²⁺, which is sent to solvent extraction and electrowinning for copper production.
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 …
The current study investigated a hybrid approach using aqueous ammonia as a pH modifier for glycine-based lixiviant systems to leach copper from chalcopyrite while maintaining surface...
The experiments of agitation leaching were carried out in aqueous ammonia/ammonium carbonate solution, to recover copper from the flotation tailings of waste copper oxide residue.
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.
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 …
Copper Leaching - Free download as PDF File (.pdf), Text File (.txt) or read online for free. This document reviews ammonia leaching in the copper industry. It provides a brief history of ammonia leaching, including some of the earliest industrial applications in the early 20th century. It also summarizes a few notable processes developed over time, …
Based on previous studies on chalcopyrite leaching [17,18], the examples of copper dissolution in this study may be represented as shown in Reactions (6) glycine and (7), which explain the improvement sively reported that both ammonia and can leach copper efficiently by complexa-of copper 2+ or Cu(NH3)42+) and copper glycinate (Cu(Gly)2 ...
Minerals 2022, 12, 612 3 of 12 ores. The study showed that 85.1% of gold was dissolved into leachate from different ores by leaching with glycine (1.5 kg/t) and potassium permanganate (3 kg/t) for ...
The experiments of agitation leaching were carried out in aqueous ammonia/ammonium carbonate solution, to recover copper from the flotation tailings of waste copper oxide residue. The main copper minerals contained in the flotation tailings are chrysocolla, malachite, and cuprite, with the copper grade of 1.12%. Effects of lixiviant …
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.
Controlling thiosulfate and oxygen concentration is also critical to the gold leaching process in copper-ammonia-thiosulfate solutions [73,75]. ... system will produce a large amount of wastewater and tailings containing ammonia or ammonium, which may cause great damages to the surrounding environment. ... system for leaching gold …
The tests used in the physical characterization of the copper tailings using standard methods are specific gravity (Pycnometer test), residual moisture content (Gravimetric method), loss on ignition ... Only Cu extraction yields at 90 min using ammonia leaching were slightly comparable to H 2 SO 4 leaching at pH 3. All the other recoveries ...
In pyrometallurgical processes refining copper, the main source of loss in the conversion stage is from slag. 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, NH4OH …
Ammonia leaching primarily relies on the complexation of NH 3 with Ni 2+ and Co 2+ to generate stable ammonia complexes Ni(NH 3) 6 2+ and Co(NH 3) 6 3+ [23], [24]. Therefore, it is commonly used as a powerful reagent for the selective leaching of Ni and Co from materials that contain those metals as a result [25].
The comparison of leaching with alkaline bacteria, ammonia, or their combination undoubtedly shows that copper recovery is significantly higher when combined with an increase in Cu extraction ...
Leaching of copper from tailings using ammonia–ammonium chloride solution and its dynamics Ammonia– ammonium chloride Leaching time, the concentration of ammonia, solid/ liquid ratio and ...
A comparison between using ammonia and sodium hydroxide as pH modifiers was conducted and the leaching performance of glycine-ammonia has been found to be superior based on both metal extractions and leaching kinetics. The use of resin-in-leach (RIL) to recover Ni and Co from glycine-ammonia leaching solution …
that copper could be selectively recovered from tailings. Keywords Copper .Extraction .Tailings .Leaching .Ammoniasalts 1 Introduction Copper production methods vary based on the characteristics of the ore that is used as the raw material. In general, pyro-metallurgical methods are used for sulfur-containing copper
For instance, the possibile evaluation of copper bioleaching from flotation tailings on a benchscale, commissioning and industrial tests (Kondrat'eva et al., 2012; Yin et al., 2017), electro-dialytic remediation of copper …
The leaching kinetics of low-grade copper ore with high-alkality gangues was studied in ammonia-ammonium sulphate solution. The main parameters, such as ammonia and ammonium sulphate concentrations, particle size, solid-to-liquid ratio and reaction temperature, were chosen in the experiments. The results show that the increase of …
AMMONIA LEACHING IN THE COPPER INDUSTRY: A REVIEW . V Radmehr. 1, S M J Koleini. 2, ... Leaching of copper from tailings using ammonia/ammonium chloride solution and its dynamics
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 low-grade ore resources for zinc and copper provided that novel economically feasible metal extraction and metal recovery …
Article: Copper recycle from sulfide tailings using combined leaching of ammonia solution and alkaline bacteria
Wu Heng-shan and some other investigators have made leaching experiments of copper tailings by using acid and ammonia separately and shown the feasibility of secondary recovery of copper tail-ings[2]. However, the period of leaching required in their studies is so long that it cannot be a satisfactory solution in the process …
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. The …
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 pres-sure of 0.8 MPa. Under …
Selective extraction of copper from tailings was successively investigated by Turan et al. [21] using a mixture of ammonia salts as leaching reactants and managed to obtain a copper recovery of 91 ...
The experiments of agitation leaching were carried out in aqueous ammonia/ammonium carbonate solution, to recover copper from the flotation tailings of waste copper oxide residue. The main copper minerals contained in the flotation tailings are chrysocolla, malachite, and cuprite, with the copper grade of 1.12%.