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

In order to comprehensively recover copper from a copper mine, the process of copper recovery from tailings by ammonia leaching is investigated. The results show that the …

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 mine tailings in 2005 (Hansen et al., 2005), acid leaching of copper and zinc from flotation tailings using a H2SO4 solution ...

 — In this study, a cleaner metal extraction method for sulfide tailings using combined leaching with an ammonia solution and novel alkaline bacterium was proposed to solve the previously mentioned problems. Based on our findings, the following conclusions can be drawn: •

DOI: 10.1109/ICCCENG.2010.5560449 Corpus ID: 29359400; Leaching of copper from tailings using ammonia/ammonium chloride solution and its dynamics @article{Zhao2010LeachingOC, title={Leaching of copper from tailings using ammonia/ammonium chloride solution and its dynamics}, author={Guo-dong Zhao and …

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 …

 — Copper leaching from ore using ammonia should be followed by selective extraction of copper using the extraction agent in the solvent extraction process. LIX63 was the first extraction agent used in …

 — This study investigated the usage conditions of five different ammonia salts as leaching reactants for the purpose of selective extraction of copper from tailings.

 — 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 …

The initial content of copper in the tailings was 1109 mg Cu/kg of dry tailing, where close to 40% of the sample in weight corresponded to a soluble fraction. ... the technique envisaged consists in the copper dissolution by …

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 these …

 — The recent revolution of technology makes copper find a wide array of applications in electrical, construction, machinery, and defense industries, among others due to its excellent properties of ductility, malleability, and corrosion resistance, among others. However, with the rise in the development of electrical and electronic products, a …

 — LIU et al [12] investigated the dissolution kinetics of low-grade copper ore in ammonia-ammonium chloride solution. The results indicate that the malachite is dissolved easily and chrysocolla is extracted difficultly in ammoniacal solution and bornite is not dissolved in ammonia leaching without oxidants. ... Ammonia leaching for tailings from ...

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 ...

 — Semantic Scholar extracted view of "Leaching kinetics of low-grade copper ore containing calcium-magnesium carbonate in ammonia-ammonium sulfate solution with persulfate" by Zhi-xiong Liu et al. ... Dissolution kinetics of low grade complex copper ore in ammonia-ammonium chloride solution. W. Liu M. Tang Chao-bo Tang Jing He Shenghai …

 — To identify which material sources could be suitable for leaching with ammonia, a preliminary screen of eight primary and secondary materials was performed with both synthetic and biogenic ammonia poised at a total ammonia concentration of 1 mol L −1.After a contact time of 24 h, target metals Cu, Zn or Ni generally dominated in the …

 — 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/S1003-6326(09)60235-1 Corpus ID: 55527376; Dissolution kinetics of low grade complex copper ore in ammonia-ammonium chloride solution @article{Liu2010DissolutionKO, title={Dissolution kinetics of low grade complex copper ore in ammonia-ammonium chloride solution}, author={W. Liu and Mo-tang Tang and Chao …

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 main important …

 — Chalcopyrite is the most abundant copper mineral and its bioleaching has been the subject of several studies due to its refractory nature when submitted to hydrometallurgical processes. Moreover, the growing worldwide demand for copper requires the processing of low-grade ores or mining tailings for which hydrometallurgical …

 — 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 ...

 — This study presents the novel idea of a cyanide-free leaching method, i.e., glycine-ammonia leaching in the presence of permanganate, to treat a low-grade and copper-bearing gold tailing. Ammonia played a key role as a pH modifier, lixiviant and potential catalyst (as cupric ammine) in this study. Replacing ammonia with other pH …

 — 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.

 — MoO3 is a widely accessible foundation material and the primary compound used to produce numerous molybdenum products. The ore was first roasted, and the leaching behavior of concentrated molybdenite mineral was assessed. The optimal conditions for the leaching process were identified in the second step, and in a …

 — 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 …

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

In order to comprehensively recover copper from a copper mine, the process of copper recovery from tailings by ammonia leaching is investigated. The results show that the optimal condition is 1∶1.6 quality ratio of tailings and 25%～28% ammonia solution, 30℃ leaching temperature, 16d leaching period, 0.22mol/L assistant addition. The results can …

 — 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 this study, the dissolution conditions and dissolution kinetics of copper from malachite in the presence of organic acid (C4H6O6) as an organic leaching reagent were examined. The effects of particle size, acid concentration, time, solid/liquid ratio, temperature, and mixing speed on the dissolution process of copper were investigated. …

 — A comparison leaching with alkaline bacteria, ammonia or a combination of the two clearly indicated that copper recovery was remarkably better with combination that Cu extraction rate increased from 4.42% (48 days, ammonia leaching) or approximately 20% (30 days, alkaline bacterial leaching) to 29.57% (30 days, combined leaching).