— 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 …
WhatsApp: +86 18221755073
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
WhatsApp: +86 18221755073
— 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 …
WhatsApp: +86 18221755073
— 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 …
WhatsApp: +86 18221755073
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
WhatsApp: +86 18221755073
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 …
WhatsApp: +86 18221755073
— 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 …
WhatsApp: +86 18221755073
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 …
WhatsApp: +86 18221755073
— 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 ...
WhatsApp: +86 18221755073
— 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 …
WhatsApp: +86 18221755073
— 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 …
WhatsApp: +86 18221755073
— 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 ...
WhatsApp: +86 18221755073
— Ammonia leaching is a promising method for processing low-grade copper ores, especially those containing large amounts of oxidized copper. In this paper, we …
WhatsApp: +86 18221755073
— 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 …
WhatsApp: +86 18221755073
— 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 ...
WhatsApp: +86 18221755073
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 ...
WhatsApp: +86 18221755073
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, …
WhatsApp: +86 18221755073
— 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 …
WhatsApp: +86 18221755073
— 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 …
WhatsApp: +86 18221755073
— 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%.
WhatsApp: +86 18221755073
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 …
WhatsApp: +86 18221755073
— 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 an ammonia-ammonium chloride-water solution were calculated using an exponential computation method based on both mass balance and charge balance equations. The …
WhatsApp: +86 18221755073
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 ...
WhatsApp: +86 18221755073
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 …
WhatsApp: +86 18221755073
— 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 …
WhatsApp: +86 18221755073
— 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 …
WhatsApp: +86 18221755073
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 …
WhatsApp: +86 18221755073
— 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 …
WhatsApp: +86 18221755073
— The experiments of agitation leaching were carried out in aqueous ammonia/ammonium carbonate solution, to recover copper from the flotation tailings of …
WhatsApp: +86 18221755073
— 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. …
WhatsApp: +86 18221755073
— 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...
WhatsApp: +86 18221755073
— This study investigated the usage conditions of five different ammonia salts as leaching reactants for the purpose of selective extraction of copper from tailings.
WhatsApp: +86 18221755073
— 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.
WhatsApp: +86 18221755073
— 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 …
WhatsApp: +86 18221755073