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The combination of reduction, roasting, acid leaching, and magnetic separation was proposed in 13. The roasting of zinc leaching residues by ammonium sulphate was described in 14, where the...
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In this work, a novel in-deep purification method of SPL by oxidation-expansion acid leaching (OEAL) was proposed. The following conclusions were obtained. • The SPL contains active, inert, and internal impurities. NaF and NaAl 11 O 17 are the main active impurities, which can be efficiently removed by alkali and acid leaching.
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Oxidation roasting has also been evaluated based on improving Ni extractability during hydrochloric acid leaching (Zhu et al. Citation 2012) or selective oxidation of iron sulfides prior to ammoniacal leaching (Leo and Georg Citation 1954).
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High temperature pressure oxidation of a low-grade nickel concentrate was examined to demonstrate the potential benefits and shortcomings of this approach. The high iron sulfide content ensured that acid generation was much greater than for higher grade concentrates. This results in the formation of basic iron sulfate phases and a …
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After roasting, acid leaching or water leaching was followed to leach out high valence chromium, Cr 2 O 7 2− or CrO 4 2− (Gu et al. 2019; Guo et al. 2014; Ji et al. 2017b; Kim et al. 2015; Teng and Xue 2019; Wang et al. 2014a; Wen et al. 2019a).. A novel environment-friendly method based on stepwise roasting had been proposed to leach out …
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Acid leaching is applied in hydrometallurgy by using inorganic acids for the dissolution of ores, e.g., oxide ores such as limonitic laterites. Sulfuric acid can also be generated by sulfur-oxidizing bacteria or archaea if elemental sulfur is added to the …
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Oxidation pressure leaching was proposed to selectively dissolve Li from spent LiFePO 4 batteries in a stoichiometric sulfuric acid solution. Using O 2 as an oxidant and stoichiometric sulfuric acid as leaching agent, above 97% of Li was leached into the solution, whereas more than 99% of Fe remained in the leaching residue, enabling a …
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A sustainable closed-loop method of selective oxidation leaching and regeneration for lithium iron phosphate cathode materials from spent batteries. Journal of Environmental Management 2022 ... Aluminum separation by sulfuric acid leaching-solvent extraction from Al-bearing LiFePO4/C powder for recycling of Fe/P. Waste Management …
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After the atmospheric hydrochloric acid leaching method is used to treat laterite ore and initially purify it, the extract that results often contains a significant amount of Fe2+ impurities. A novel metallurgical process has been proposed that utilizes microbubble aeration to oxidize Fe2+ ions in laterite hydrochloric acid lixivium, facilitating subsequent …
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Conclusions. 1. Direct oxidation sulfuric acid autoclave leaching of fine dust makes it possible to extract up to 89% of copper and 92% of zinc, and in this case there is breakdown of copper and zinc ferrites a sulfides. Arsenic is transferred into cake in the form of iron arsenate that complicates its treatment. 2.
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oxidation of pyrite, one of the most abundant minerals on earth. In general, under oxidant condition and low pH, pyrite oxidation proceeds through two basic steps: In the first step, the dissolution of pyrite to ferrous ions in an acid medium proceeds through the formation of an iron-deficient or a sulfur-rich layer rather than elemental sulfur.
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In addition, the researchers implemented methodologies that, while all focused on the extraction of metals from an acid leaching process, these techniques …
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The mobilization of metal cations from often almost insoluble minerals in ores by biological acidification, oxidation, and complexation processes is referred to as …
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The objective of this study is to explore the optimal leaching conditions for arsenic leaching in acid oxidation system and meanwhile, to investigate the kinetics of arsenic leaching process. The effects of acid concentration, liquid-to-solid ratio, agitating speed, leaching temperature and time on the extraction of Arsenic from the ash were ...
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Simultaneous pressure leaching oxidation involves the oxidation of pyrite and Au cyanidation in alkaline media, where oxidation liberates or exposes gold particles that are otherwise occluded or finely disseminated. ... for Cu extraction from chalcopyrite concentrate using acid leaching at low pressure. 3.3.4. Simultaneous Pressure …
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Here, we describe a selective recovery process that can achieve economically efficient recovery and an acceptable lithium leaching yield. Adjusting the acid concentration and amount of oxidant enables selective recovery of lithium ions. Iron is retained in the leaching residue as iron phosphate, which is easy to recycle.
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3.2 Leaching behavior in the air oxidation–water leaching process The pH value is expected to play a key role in lithium recovery via the air oxidation–water leaching process since the oxidative ability of air is closely related to pH. Fig. 2(a) shows that the leaching efficiencies of Li increase with time at different rates as the pH varies. . …
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The combined process of anaerobic roasting, persulfate leaching, and oxalic acid precipitation has been used to treat cyanide tailings, which achieved the harmless reduction and value-added utilization of the tailings while obtaining high-quality ferrous oxalate products. This paper focused on the main process and technical parameters of …
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The nitric acid leaching process is advantageous in that it can produce highly oxidizing conditions and is therefore an effective leaching agent for most sulfides . However, a disadvantage of the nitric acid leaching process is the oxidation of sulfide, both to elemental sulfur and sulfate, in many cases in almost equal parts.
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Oxygen and acid are used as oxidant and leaching agent, respectively, valuable metals can be extracted from nickel sulfide concentrate into the solutions by …
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Selective separation of Li can be achieved by oxidation roasting followed by low-acid pressure leaching. During the oxidation-roasting stage, almost all the stable LiFePO 4 cathode materials were first transformed into Li 3 Fe 2 (PO 4) 3 and Fe 2 O 3, with the most suitable oxidation-roasting temperature determined to be 550 °C.
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Hence, the phenomenon that takes place during the pre-oxidation allows a better leaching selectivity of iron toward titanium at subsequent reductive acid leaching of the pre-oxidized ilmenite.
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A thorough surface reconstruction with dual-site metal leaching induces an activity improvement by approximately two orders of magnitude, which makes the reconstructed SrCo 0.5 Ir 0.5 O 3 among the best for water oxidation in acid.
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A H2SO4–H2O2 system was developed to enhance the efficacy of vanadium extraction from roasted vanadium steel slag. The optimum parameters and the behavior of vanadium extraction were investigated …
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The kinetics of nitric acid leaching of cerium was investigated for the oxidation roasted Baotou mixed rare earth concentrate. The effects of leaching temperature, HNO 3 concentration, liquid–solid ratio (L/S) and stirring rate on rare earth extraction were studied. The XRD and SEM mapping analysis of the samples before and …
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After oxidation of NdFeB magnet powders, selective leaching with nitric acid was carried out to achieve high-purity REE-rich leaching liquor. First, the oxidation kinetics of NdFeB powders was studied in detail to …
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Dissolution of aerial oxidation products on pyrite particles in the first 15 min apparently led to a sulphur-rich surface, and was followed by slower dissolution of pyrite …
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In this paper, a scheme is proposed for the treatment of arsenic-containing lead slime by the combination of acid pressure oxidation leaching and forming scorodite. On the basis of thermodynamic calculations, the effects of six factors including acid concentration, oxygen partial pressure (pO2), liquid to solid ratio (L/S), agitating …
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The selectivity of leaching can be attributed to the oxidation of Fe 2+ to Fe 3+ by H 2 O 2. While the formic acid provides H + ions for efficient lithium leaching, ... Liu Y, et al. Recovery of lithium, iron, and phosphorus from spent LiFePO4 batteries using stoichiometric sulfuric acid leaching system. ACS Sustain Chem Eng. 2017;5(9):8017–24.
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Pressure leaching and pressure oxidation are hydrometallurgical processes applied to the extraction of many metals.The processes occur above atmospheric boiling …
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