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Research paperReductiondissolution of cobalt oxide in acid
1997年1月1日· Abstract The kinetics of cobaltocobaltic oxide (Co 3 O 4) dissolution in sulphuric acid have been investigated The dissolution rate is significantly enhanced by the use of Na 2 SO 3 in aqueous media for the reduction of Co 3+ to Co 2+ The2010年5月22日· The reaction orders of dissolution for hydrogen ions in sulfuric acid and EDTA (dlogW/dpH = 05 ± 01) and for anions (dlogW/dlog[An −] = 05 ± 01) are determined A specific feature of the dissolution kinetics in EDTA is a maximum in the dissolution rate of the cobalt oxides at pH −1Kinetics of dissolution of cobalt oxides in acidic media
Kinetics of dissolution of cobalt oxides in acidic media
2010年1月1日· Abstract The kinetics of dissolution of cobalt oxides Co2O3 and Co3O4 in aqueous solutions of acids (H2SO4, EDTA) is experimentally studied Dissolution rate W increases with the temperatureThe kinetics of cobaltocobaltic oxide (Co3O4) dissolution in sulphuric acid have been investigated The dissolution rate is significantly enhanced by the use of Na2SO3 in aqueous media for the reduction of Co3+ to Co2+ The dissolution was studied as a function of rate of agitation, leaching time, acid concentration, temperature and Na2SO3Reductiondissolution of cobalt oxide in acid ' media: a kinetic
(PDF) Dissolution of cobalt (III) using simultaneously
2018年2月9日· The leaching of cobalt carbonate is very fast in sulfuric acid media But the leaching of cobalt (III) oxide needs a presence reducingThe kinetics of cobaltocobaltic oxide (Co 3 O 4 ) dissolution in sulphuric acid have been investigated The dissolution rate is significantly enhanced by the use of Na 2 SO 3 in aqueous media for the reduction of Co 3+ to Co 2+ Reductiondissolution of cobalt oxide in acid media: a kinetic
Kinetics of Dissolution of Cobalt Oxides in Acidic Media Springer
Abstract—The kinetics of dissolution of cobalt oxides Co 2O 3 and Co 3O 4 in aqueous solutions of acids (H 2SO 4, EDTA 1) is experimentally studied Dissolution rate W increases with the temperature or the EDTA concentration The reaction orders of dissolution for hydrogen ions in sulfuric acid and EDTA2018年1月26日· The activation energy of the process is Ea (H2SO4) = = 70 kJ/mol, Ea (EDTA) = 60 kJ/mol, for copper oxide the activation energy is 73 ± 05 kJ/mol The simulation of the processes showed that theKinetic of Cobalt and Copper Oxides Dissolution in Acidic Media
Assessing the Oxidative Degradation of NMethylpyrrolidone
2020年3月4日· 1 Introduction Semiconductor device fabrication is the process used to create integrated circuits that are present in electrical and electronic devices []The fabrication process shown in Figure 1 begins with a wafer of semiconductor material and includes a sequence of photographic and chemical processing steps during which2014年2月1日· Cobalt white alloy containing cobalt as high as 42% is obtained from cobalt oxide concentrates processed by electric reduction furnaces This kind of alloy has become an important form of cobalt resource exported by Africa (Bai, 2007) Intensive studies have been performed on the dissolution of cobaltcontaining alloys to extract cobaltThe influence of Cl− on the electrochemical dissolution of cobalt
Electrochemical Recovery of Cobalt from Cobalt Oxide in an
2021年8月4日· Cobalt is widely used in such industrial applications as magnets, high strength materials, and rechargeable lithiumion batteries 1 Especially, the demand for Co as a constituent of the cathode active materials of lithiumion batteries has been increasing remarkably because lithiumion batteries are a key component of electrified vehicles,The rate of nickel (II) and nickel (III) oxide dissolution in sulfuric, hydrochloric, and nitric acids was measured as a function of the acid concentration and temperature, and a kinetic model of this process is suggested The limiting step of the dissolution process is the passage of the complexes forming on the oxide surface into the solutionDissolution Kinetics of Nickel (II) and Nickel (III) Oxides in Acid Media
Enhancing the stability of cobalt spinel oxide towards Nature
2022年2月14日· Although the benefits of making a mixed oxide towards OER have been proposed in several recent studies 14,15,16,17,18,19,20,21, the marked improvement of the activity and stability in acid makes2012年2月4日· Abstract and Figures Samples of clay containing 815% iron oxide and 2749% alumina were leached in hydrochloric acid The effects of concentration of acid, time and temperature on the rate ofKinetics of dissolution of iron oxide in clay in hydrochloric acid
(PDF) Leaching recovery of zinc, cobalt and manganese from zinc
2007年9月1日· dissolution of cobalt oxide in acid media: a kinetic study”, Hydrometallurgy It has been observed that the reduction leaching of Mn in the presence of pyrite is 025 and 10 order with2017年12月1日· Noble metals Mass spectrometry Electrocatalyst In this study, the electrochemical transient dissolution of polycrystalline silver, gold, iridium, palladium, platinum, rhodium, and ruthenium is examined in 005 M NaOH alkaline electrolyte as a function of electrode potential An inductively coupled plasma mass spectrometerThe Electrochemical Dissolution of Noble Metals in Alkaline Media
Comparing the extent of the dissolution of coppercobalt ores
The maximum cobalt extracted was about 38% in tartaric acid compared to about 80% in sulphuric acid media The dissolution of copper and cobalt is governed by the extent to which the two acids dissociate, which is quantified by their respective dissociation constants (pKa) The lower the pKa value, the higher the dissociation rateAlthough the degradation of OER activity over iridium oxide was observed in both acidic and alkaline solutions, 13,101 mechanistic studies on the dissolution of iridium have been reported only in acidic solutions 62,71,72,104 Two types of dissolution pathways were proposed: (1) dissolving via redox of the iridium centre as Ir 3+ (5) in Fig 1a and b, (2)Recent advances in understanding oxygen evolution reaction mechanisms
Iridium As Catalyst and Cocatalyst for Oxygen
2014年3月19日· Among noble metal electrocatalysts, only iridium presents high activity for both the oxygen reduction reaction (ORR) in acid medium, in the oxide form, and the oxygen evolution reaction (OER) in acidThe kinetics of cobaltocobaltic oxide (Co 3 O 4 ) dissolution in sulphuric acid have been investigated The dissolution rate is significantly enhanced by the use of Na 2 SO 3 in aqueous media for the reduction of Co 3+ to Co 2+ The dissolution was studied as a function of rate of agitation, leaching time, acid concentration, temperature and NaReductiondissolution of cobalt oxide in acid media: a kinetic
Solvometallurgical recovery of cobalt from lithium
Only DESs comprising relatively strong organic acids combined with choline chloride were able to leach cobalt Ethylene glycol, being the weakest acid considered in this study, could not leach cobalt 52 However, although2013年9月1日· The leaching processes of zinc plant purification residue in sulfuric acid solution were investigated with respect to the effects of sulfuric acid concentration, reaction temperature, and particle size A particle size of 75–80 μm was required to leach 998% cobalt and 9197% zinc at 70 °C for 20 min when the sulfuric acid concentration wasAcid leaching kinetics of zinc plant purification residue
Microbial Leaching for Recovery of Nickel and Cobalt from
2021年2月18日· The acids produced have dual activities that are lowering the pH of media and increase in efficient microbial load Different organic acids are secreted by several heterotrophic fungus and bacteria engages in bioleaching process such as citric, lactic, gluconic, formic, oxalic (Table 1 ) 90% of nickel recovery had been investigated byAnodic dissolution, socalled anodic electrosynthesis, is the most wellknown electrochemical synthesis route for the preparation of MOFs [71] In anodic dissolution, an electrode is immersed in a solution containing a supporting electrolyte and the organic linker When an oxidation voltage or current is applied, the electrode (anode) dissolvesAnodic Dissolution an overview | ScienceDirect Topics
Electrochemical processing in molten salts RSC Publishing
The electroreduction procedure involves the dissolution of the uranium and plutonium oxide granules or powder typically into a molten chloride system such as LiCl–Li 2 O at 650 °C ; the careful control of saltsoluble fission products is needed to prevent the slowing of the reduction process 46,47 It has been demonstrated that this initial step in the2023年6月1日· Mixed transition metal oxide electrodes were prepared by dip coating and heat treatment • Sb incorporated CoFe oxides electrodes shows good stability for OER in acid media • Distortion occurred in the FeCoO x electrode under acidic conditions for OER • Structure of the FeCoSbO x electrode was maintained for OER in acidic media •Sb incorporated into oxides enhances stability in acid during the
Leaching Cobalt from a NickelContaining CopperCobalt
2022年2月3日· The cobalt ore deposit contains nickel which is caused by atomic substitution Cobalt oxide deposits are difficult to dissolve especially in tetravalent form (eg Co 2 O 3) since Co 3+ becomes soluble only after converted to Co 2+ [2, 6, 8] Upon contact with an acid (H 2 SO 4), the Co 2+ would dissolve (Eq 1) leaving Co 3+ unreactiveStrongly oxidizing conditions are required for the dissolution of noble metals Aqua regia, a mixture of concentrated nitric acid and concentrated hydrochloric acid in a 1: 3 volume ratio, is a wellknown lixiviant for gold, platinum and palladium, while rhodium can be dissolved if it is in a finely divided form Several recycling processes to recover precious metals fromDissolution of noble metals in highly concentrated acidic salt