— 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 …
— 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. …
— 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 …
— 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 …
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 concentration, …
— 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...
— 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 …
— 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 work aims a novel approach, analogous to LPF, but with specific differences that include leaching with ammonia instead of acid, keeping alkaline pH (pH …
— 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/ammonium chloride solution and its dynamics ammonia/ (ammonium chloride leaching time, the concentration of ammonia, solid/liquid ratio and temperature 75 Guo-dong and Qing, 2010 ...
— 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 …
— 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. …
— 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 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 … Expand
In this case, there would be no additional step needed to separately remove the iron from the solution. Fig. 4 Ammonium carbonate 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) Fig. 6 Ammonium nitrate leaching of tailings (leaching time 120 min, solid/liquid ratio 1/10, a ...
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 mine tailings in 2005 (Hansen et al., 2005), acid leaching of copper and zinc from flotation tailings using a H2SO4 solution ...
— 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%.
— 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 using ammonia solution were lower than those obtained using both acids. Manganese recoveries were lower than Cu, as ammonia solution is more selective towards Cu than Mn .
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 …
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 …
— 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).
— 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 …
— 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 …
— The addition of ammonia in the leaching system also produces a large amount of wastewater and tailings containing ammonia or ammonium. The water hazard class regulation (WGK) issued by Germany has clearly stipulated that ammonium ion (NH4+) is a low-hazard substance to water (WGK=1), while ammonia (NH3) is a …
— 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 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 …
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 …
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.
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 …
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 ...
