· The zinc vapor is oxidized, and the formed oxide is conducted to the second stage of neutral leaching. The zinc silicate coming along with the zinc oxide is not dissolved, but circulates back into the furnace, so that it does not constitute any drawback for the
READ MOREand zinc was present as zinc sulfate heptahydrate (ZnSO4.7H2O), zinc ferrite (ZnFe2O4) and zinc silicate (2ZnO.SiO2) in the leach residues. Initially, water leaching experiments were carried out to determine water soluble amount of blended ...
READ MORESilica is detrimental to the recovery of zinc from zinc bearing siliceous materials. The difficulties involved in the hydrometallurgical processing of silica are well documented, the major problem being the formation of gels. These are extremely difficult to separate from solution, creating serious problems.
READ MOREPrevious processes, both pyrometallurgical and hydrometallurgical, for treating zinc silicate ores are reviewed. Some comparisons are made with the new continuous leaching process recently developed by the Electrolytic Zinc Company of Australasia Limited. These comparisons, based on tests with two different zinc silicate ores, demonstrate the simplicity and effectiveness of the new process.
READ MOREKinetics of sulphuric acid leaching of a zinc silicate calcine
READ MORE· The leaching of zinc silicate concentrates with high- and low-iron content was studied. Iron was found to be present as mainly hematite and franklinite. The rate of zinc extraction increased gradually with sulphuric acid concentration in the range 0.1 to 1 mol/L.
READ MOREThe invention relates to a method for the leaching of oxidized ores and in particular zinc ores. The ore, wherein the valuable metals are at least partially in silicate form, are routed to an acidic leaching stage in conditions where the silicate decomposes and the ...
READ MOREOutotec''s zinc silicate and carbonate leaching process provides high zinc recovery while still controlling silicon leaching and the removal of silica. After leaching, iron removal and solution purification or zinc solvent extraction steps produce a solution suitable for zinc electrowinning with a final zinc …
READ MORE· The alkaline leaching kinetics of a zinc silicate ore assaying 34.1% Zn, 11.1% Fe and 22.9% SiO 2 is studied in sodium hydroxide solutions. Speciation diagrams indicate zinc dissolution as [Zn(OH) 4 ] 2− and SEM analysis showed a progressive reduction in particle size during leaching which supports the shrinking particle model.
READ MORE· The processing of zinc silicate ores is becoming more attractive due to the depletion of zinc sulfide ores as well as the restriction on sulfur emissions during their processing, . In industry, the leaching process is performed in a cascade reactor unit comprising two stainless steel reactors.
READ MORERecent developments of acid leaching and solvent extraction of zinc silicate ores have produced renewed commercial interest. However, the leaching kinetics of these concentrates has received little attention. This work, therefore, addresses the leaching of a zinc silicate concentrate in sulphuric acid. The effects of particle size (0.038–0.075mm), temperature (30–50°C) and initial acid ...
READ MOREThe present work is concerned with the kinetic study of pressure leaching of zinc silicate ore in sulfuric acid solutions. The effects of leaching temperature, particle size, sulfuric acid concentration and agitation speed on the zinc extraction were evaluated. The results ...
READ MOREXu H, Wei C, Li C, Fan G, Deng Z, et al. (2010) Sulfuric acid leaching of zinc silicate ore under pressure. Hydrometallurgy 105(1-2): 186-190. Li C, Wei C, Xu HS, Li M, Li X, et al. (2010) Oxidative pressure leaching of sphalerite concentrate with high indium and
READ MORERob Francis. GENERAL PAPER Repair of Single Coat Inorganic Zinc Silicate Coatings R A Francis1, D Ellis2 & A L Walker3 1 Connell Wagner, South Melbourne, Victoria 2 SA Water, Adelaide, South Australia 3 VicRoads - GeoPave, Burwood East, Victoria This paper was first presented at the Corrosion Control 007 conference in Sydney on the 25 - 28 ...
READ MORE· Pressure acid leaching of zinc silicate ores selectively separates valuable zinc from silica and iron, replacing conventional pyrometallurgical and hydrometallurgical methods. This study determines the optimum conditions for the dissolution of zinc silicate concentrates and achieves a higher zinc extraction (> 97%), lower iron (< 0.77%) and silica dissolution (< 4%) with a high selectivity.
READ MORE· Zinc silicate deposits even from sameregion can quitevariable zincsilicate ore Guangxiprovince Chinadisplays highly variable composition zinc,iron, calcium, magnesium silicathough dominantmineral leachingexperiments, analyticalgrade sulfuric acid massfraction
READ MORE· Perry, W. Refining zinc silicate ore by special leaching technique. Chem. Eng. 73, 182–184 (1966). CAS Google Scholar 11. Bodas, M. Hydrometallurgical treatment of zinc silicate ore from ...
READ MOREZinc silicate ore was characterized mineralogically and the results showed that zinc exists mainly as hemimorphite and smithsonite in the sample. Sulfuric acid pressure leaching of zinc silicate ore was carried out to assess the effect of particle size, sulfuric acid concentration, pressure, reaction time and temperature on the extraction of zinc and the dissolution of silica. Under the ...
READ MOREleaching of zinc silicates and an activation energy of 59.5±2.9 kJ/mol wasobtainedforthedissolutionkineticsofacalcinedzincsilicate.The same model was applied afterwards to the leaching of non-calcined
READ MOREPressure leaching of zinc silicate ore in sulfuric acid medium LI Cun-xiong(), XU Hong-sheng(), DENG Zhi-gan(), LI Xing-bin(), LI Ming-tin(), WEI Chang( ) Faculty of Metallurgical and Energy Engineering, Kunming University of
READ MOREThe kinetics of zinc silicate leaching in sodium hydroxide Hydrometallurgy, 2010 Victor Oliveira Download PDF Download Full PDF Package This paper A short summary of this paper 37 Full PDFs related to this paper READ PAPER The kinetics of zinc silicate ...
READ MOREThe silicate bearing residue is treated in a Waelz process, so that the major part of the silicic acid contained in the silicates is combined in the iron silicate slag formed in the Waelz process, and the zinc is returned into leaching mainly in oxidic form.
READ MOREMetais Zinc (VMZ) has devised an integrated process to treat both zinc sulphides and silicates (Souza et al., 2007). The process consists of the leaching of zinc silicate ores (willemite, Zn 2SiO 4, and hemi-morphite, Zn 4Si 2O 7(OH) 2·H 2O), in the same plant
READ MORE· 1. Environ Technol. 2015;36(23):2977-86. doi: 10.1080/09593330.2014.982715. Epub 2014 Dec 1. Mechanisms of zinc incorporation in aluminosilicate crystalline structures and the leaching behaviour of product phases. Tang Y(1), Shih K(1). Author information: (1)a Department of Civil Engineering, The University of Hong Kong, Pokfulam Road, Hong Kong, SAR People''s Republic of …
READ MOREThe present work shows that the kinetics of sodium hydroxide leaching of zinc silicate is chemically controlled with an activation energy of 67.8 ± 9.0 kJ/mol. ConclusionsThe alkaline leaching kinetics of a zinc silicate ore assaying 34.1% Zn, 11.1% Fe and 22.9% SiO 2 was studied.
READ MORELeaching Kinetics Zinc silicate Shrinking core model Gelatinous silica layer A new mathematical model was developed for leaching of zinc ores containing silicates such as hemimorphite which ...
READ MOREAbstract: The leaching kinetics of zinc silicate in ammonium chloride solution was investigated. The effects of stirring speed (150−400 r/min), leaching temperature (95−108 C), particle size of zinc silicate (61−150 μm) and the concentration of ammonium
READ MORElonger leaching duration on extraction rate of Zn. As leaching duration gets longer, extraction rate of zinc gets higher both for 5 and 7 M concentrations. The maximum extraction rate was 76.66% using 7M of NH 3 for 12 hours. References
READ MOREEffect of iron in zinc silicate concentrate on leaching with sulphuric acid A.D. Souzaa, P.S. Pinab, F.M.F. Santosb, C.A. da Silvab, V.A. Leãob,⁎ a Votorantim Metais Zinc. BR 040, Km 284 — CEP 39.205-000, Três Marias, MG, Brazil b Hydrometallurgy Laboratory Núcleo de Valorização de Materiais Minerais — Dept. Metallurgical and Materials Engineering.
READ MORE58% and 20% germanium occurred in the ferrite and silicate phases, respectively. Leaching of zinc residue with high germanium was investigated as a process to recover germanium. It was found to be much more effective using sulfur dioxide as a reductant.
READ MOREAbdel-Aal, E.A., "Kinetics of sulfuric acid leaching of low grade zinc silicate ore", Hydrometallurgy, 2000, 55, 247. has been cited by the following article: Article Kinetics of Simultaneous Dissolution of Zinc and Manganese from Electrolyte Paste of Spent Zinc 1, ...
READ MORESuch metal immobilization may indicate that the significance of fungi in effecting metal mobilization from mineral ores such as zinc silicate and zinc sulfide is rather limited, especially if compared with bacterial sulfide leaching.
READ MOREA process of leaching silicated zinc ores with sulfuric acid in which the ore is reacted at elevated temperature with at least a stoichiometric amount of sulfuric acid, treating products of the reaction with a predetermined quantity of hot water, filtering the zinc sulfate ...
READ MORE"The kinetics of zinc silicate leaching in sodium hydroxide," Hydrometallurgy, 102 (1–4) (2010), 43–49. CrossRef Google Scholar [6] Z.L.Yin et al., "Dissolution of zinc silicate (hemimorphite) with ammonia-ammonium chloride solution," Hydrometallurgy, 103 (1–4 ...
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