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Sulphuric acid leaching of zinc and copper from Nigerian Complex Sulphide Ore in the presence of hydrogen peroxide by Olubambi*†, Borode†, and S. Ndlovu* Synopsis The leaching of zinc and copper from Nigerian bulk sulphide ore with sulphuric acid in the presence of hydrogen peroxide was studied.
The 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 obtained show that the zinc extraction increases with increasing sulfuric acid concentration and leaching .
Dec 01, 2007· The high reactivity of the roasted silicate in sulphuric acid medium associated to a small difference in the surface area of the different size fractions, could have masked the effect of particle size upon the zinc leaching rate (Aydogan et al., 2005, Bobeck and Su, 1985, Ghosh et .
It was found that a maximum zinc extraction (95% Zn) was obtained at a M concentration of sulphuric acid in 3 h leaching at 70°C, keeping the solid:liquid weight ratio at 1:5 Iron and ...
It was found that a maximum zinc extraction (95% Zn) was obtained at a M concentration of sulphuric acid in 3 h leaching at 70°C, keeping the solid:liquid weight ratio at 1:5 Iron and magnesium dissolution was % and %, respectively. During leaching some silica was also dissolved (maximum 25%), which forms silicic acid.
As with oxide ores, solvent extraction and electrowinning technologies are used to recover the copper from the pregnant leach solution. Supergene sulfide ores rich in native copper minerals are refractory to treatment with sulfuric acid leaching on all practicable time scales, and the dense metal particles do not react with froth flotation media.
It was found that a maximum zinc extraction (95% Zn) was obtained at a M concentration of sulphuric acid in 3 h leaching at 70°C, keeping the solid:liquid weight ratio at 1:5 Iron and ...
Acid leaching is generally preferred, in hydrometallurgical route of separation of the value metals from spent zinccarbon type batteries. Sulfuric acid leaching in presence of a reducing agent has been tried by many researchers for efficient dissolution of manganese and zinc from the electrolyte paste of such batteries [1, 2].
Jan 01, 1996· hydrometallurgy ELSEVIER Hydrometallurgy40 (1996) 37I9 Hydrometallurgical treatment of zinc silicate ore from Thailand Bodas NonFerrous Process Division, National Metallurgical Laboratory, Jamshedpur 831 007, India Received 11 March 1994; accepted 23 September 1994 Abstract In recent years much emphasis has been placed on the leaching of zinc silicate ores by sulphuric acid.
A 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 solution from precipitated silica, washing with a further predetermined quantity of hot water (the total amount of hot ...
The dissolution or leaching behaviour of pure bulk zinc oxide and/or of zinc ferrite in sulphuric acid solution have been studied in wide range of sulphuric acid concentration and temperatures. Leaching tests with powder specimens were used to study the dissolution behavior of ZnO [2, 5] and of zinc ferrite [6,7].
Jan 29, 2004· The impurities present in both of the samples are iron, aluminum, magnesium, silica, etc. The leaching studies were carried out using alkaline, ammoniacal, and acidic solutions at different concentrations of the lixiviants at room temperature. Sulfuric acid has been found to be the suitable reagent for complete dissolution of zinc.
May 20, 2017· Ahmed IM, Nayl AA, Daoud JA (2012) Leaching and recovery of zinc and copper from brass slag by sulfuric acid. J Saudi Chem Soc. doi: / Google Scholar Altundoğan HS, Erdem M, Orhan R (1998) Heavy metal pollution potential of zinc leach residues discarded in Çinkur plant.
Zinc smelting is the process of converting zinc concentrates (ores that contain zinc) into pure zinc. Zinc smelting has historically been more difficult than the smelting of other metals, iron, because in contrast, zinc has a low boiling temperatures typically used for smelting metals, zinc is a gas that will escape from a furnace with the flue gas and be lost, unless specific ...
A solution of monosilicic acid (Si(OH)4(subscript)) was produced by leaching synthetic zinc orthosilicate (Zn2SiO4) in sulfuric acid. Precipitation was monitored by measuring the turbidity and silica concentration in solution at regular intervals. Electron microscopy .
The invention relates to a method for recovering zinc from a zinc oxide bearing material containing silicates. According to the method, the leaching of zinc compounds is carried out in circumstances where the silicates remain undissolved and consequently do not cause filtering problems. The silicate bearing residue is treated in a Waelz process, so that the major part of the silicic acid ...
temperature, leaching time, stirring speed and liquidtosolid ratio on the zinc leaching from lowgrade zinc oxide ore in a NH3H3C6H5O7H2O system were studied. The results showed that the zinc leaching rate is only % when the citric acid concentration is 0 M, and the leaching efficiency of Zn increased with increasing
(ZnFe2O4) and zinc silicate () in the leach residues. Initially, water leaching experiments were carried out to determine water soluble amount of blended leach residue, and the maximum zinc recovery was obtained as 18 %. After these trials, sulphuric acid and brine leaching were used to recover zinc and lead, respectively.
Jun 05, 2018· Batch leaching tests were carried out on zinc residue with high germanium at set pressure in stirred acid solution. The effects of SO 2, time, sulfuric acid concentration, temperature, liquidtosolid ratio, and sulphur dioxide partial pressure on the germanium dissolution were studied to optimize the leaching parameters.
It was found that a maximum zinc extraction (95% Zn) was obtained at a M concentration of sulphuric acid in 3 h leaching at 70°C, keeping the solid:liquid weight ratio at 1:5 Iron and ...
Outotec''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 .
Recent 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.
Dec 01, 2010· The results are shown in Fig. 3, which shows that the extraction of zinc and that of iron and silica increased significantly with increasing sulfuric acid concentrations and that an acid level of mol/L is sufficient to extract more than 99% zinc and dissolve about % iron and % silica in 60 min. No further zinc was leached with more ...
soda. Other workers studied the dissolution of zinc from zinc silicate ore [1214] and carbonate ore [15]. AbdelAal [12] studied the kinetic leaching in sulfuric acid solution from an Egyptian zinc silicate ore and demonstrated that the diffusion through the product layer was a .
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