Dec 01, 2010 Effect of L/S. The ore (− 98 + 74 μm) was leached in solution containing 0.46 mol/L sulfuric acid for 120 min at 140 °C at different L/S ratios ranging from 6 to 10. The obtained data plotted in Fig. 7 show that L:S ratio affected significantly the leaching recovery of iron and silica but zinc
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Jul 01, 2011 The study for the effect of sulfuric acid concentration on the extraction of zinc and the dissolution of silica was carried out by varying concentrations in the 80–160 g/L sulfuric acid range.The following leaching conditions were applied: time: 60 min, temperature: 120 °C, and air pressure: 0.6 MPa.The results are shown in Fig. 2, which show that the dissolution of silica increased ...
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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
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May 01, 2010 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 optimum conditions employed, up to 99.25% of zinc extraction and 0.20% silica dissolution are obtained.
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Apr 01, 2000 Leaching of low-grade zinc silicate ore with sulfuric acid was studied. Extraction efficiency of about 94% of the zinc present in the ore was achieved under the following conditions: particle size −200+270 mesh, temperature 70°C, reaction time 180 min, acid concentration 10%, and solid:liquid ratio 1:20 g/ml.
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Jan 01, 1996 hydrometallurgy ELSEVIER Hydrometallurgy40 (1996) 37-I9 Hydrometallurgical treatment of zinc silicate ore from Thailand M.G. Bodas Non-Ferrous 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
MoreApr 01, 2000 Leaching of low-grade zinc silicate ore with sulfuric acid was studied. Extraction efficiency of about 94% of the zinc present in the ore was achieved under the following conditions: particle size −200+270 mesh, temperature 70°C, reaction time 180 min, acid concentration 10%, and solid:liquid ratio 1:20 g/ml.
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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 ...
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Jan 15, 2021 An integrated hydrometallurgical process was used for the zinc leaching and purification from a zinc ore containing 9.75 wt% zinc. The zinc minerals
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Mar 01, 1986 The "fast leaching" technique, which makes use of the water-starved nature of the silicate--acid system shows distinct promise. Recovery of zinc of more than 80% is reported. INTRODUCTION Large heaps of ancient slag have been reported in the Zawar area of Rajasthan (India) [1]. Zawar is located 44 km south of Udaipur in Rajasthan.
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Feb 15, 2017 Similar results were observed with sulfuric acid leaching of zinc silicate calcine and ferric sulfate leaching zinc sulfides by Souza et al. , . The decrease in the Zn leaching rate with the solid to liquid ratio ( Fig. 6 ) can be explained by the decrease in the solid ZLRs particles per amount of leachant in the reaction mixture.
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Sulphuric acid leaching of zinc and copper from Nigerian Complex Sulphide Ore in the presence of hydrogen peroxide by P.A. Olubambi*†, J.O. Borode†, and S. Ndlovu* Synopsis The leaching of zinc and copper from Nigerian bulk sulphide ore with sulphuric acid in
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A solution of monosilicic acid (Si (OH) 4) was produced by leaching willemite (Zn 2 SiO 4) in sulphuric acid. Precipitation was monitored by measuring the turbidity and silica concentration in solution at regular intervals. Transmission Electron Microscopy (TEM) was used to examine the precipitate morphology. Variables known to influence silica ...
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Feb 17, 2021 2020-2-20 The ore deposit of Skorpion Zinc is unique as it is a primary oxide/silicate/carbonate zinc deposit, which cannot be concentrated by flotation. The absence of sulphur offers an advantage in that no sulphur or sulphuric acid disposal is required. The ore is leached directly in sulphuric acid to produce zinc sulphate. More
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minerals). The leaching experiments were performed using sulphuric acid solutions, whereby the kinetics of copper leaching was investigated with respect to acid concentration and solid to liquid ratio. The copper concentration in the leach solution ranged from 0.80 to 1.75 g dm-3. The total Cu recovery rate ranged from 30 to 56 %, whereas the
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Abdel-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
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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.
MoreJun 01, 2002 The sulfuric acid used has a concentration of 96% by weight and a density of 1.84 g/ml. Other chemical reagents such as Fe 2 O 3, ZnO, SiO 2, MgO, CaO, Al 2 O 3, and ZnSO 4 7H 2 O are of analytical purity.. 2.2.. ProcedureTwenty grams of ground zinc silicate ore with a particle size of 100–125 μm was employed for each experiment. The sulfuric acid used for each run was 6.3 ml, which is 1 ...
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Hydrometallurgy, 15 (1986) 267--280 267 Elsevier Science Publishers B.V., Amsterdam -- Printed in The Netherlands ZINC RECOVERY FROM ZAWAR ANCIENT SILICEOUS SLAG RAKESH KUMAR and A.K. BISWAS* Department of Metallurgical Engineering, Indian Institute of Technology, Kanpur-208016, U.P. (India) (Received December 6, 1984; accepted in revised form ...
MoreJan 15, 2021 An integrated hydrometallurgical process was used for the zinc leaching and purification from a zinc ore containing 9.75 wt% zinc. The zinc minerals
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leaching in (0.25, 0.5, 1 and 2 (mol.L-1)) sulfuric acid solutions. The subsequent leaching was performed in the optimized acid concentrations at temperatures of (25, 45, 65 and 85 °C) for (0.5, 1, 1.5 and 2 hour) at each temperature. A variable speed stirrer operated at a speed of 100rpm was maintained during in all leaching experiments at 1MPa.
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The sulfuric acid leaching of zinc plant residues was studied in an attempt to find a suitable hydrometallurgical method for zinc recovery. The parameters evaluated consist of reaction time, Solid-to-liquid-ratio, reaction temperature, agitation rate and pH. The results of kinetic analysis of the leaching data under various experimental conditions indicated that there is a reaction controlled ...
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the off gas which is suitable for sulfuric acid manufacture. Secondary Lead Processing The chief source of old scrap is lead-acid batteries and other sources include cable coverings, pipe, sheet, and other lead-bearing metals. Over 70% of the world's total output of lead is consumed in the manufacture of lead-acid storage batteries.
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Xu 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 iron content in sulfuric acid medium. Hydrometallurgy 102(1-4): 91-94.
Moreminerals). The leaching experiments were performed using sulphuric acid solutions, whereby the kinetics of copper leaching was investigated with respect to acid concentration and solid to liquid ratio. The copper concentration in the leach solution ranged from 0.80 to 1.75 g dm-3. The total Cu recovery rate ranged from 30 to 56 %, whereas the
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pyrite increases zinc dissolution [9]. On the other hand, Souza et al. [10], suggested that the iron content has small affect on the leaching kinetics of the silicate concentrate by sulphuric acid. Ferric and cupric ions, bacteria, oxygen, and other oxidants have been used as leaching
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May 18, 2018 Acid leaching using sulfuric acid as solvent is usually considered to be effective in treating the zinc oxide materials, but there are many limitations for the materials containing silicates
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Jun 12, 2018 The current research was investigated the mechanism of coal demineralization and the effect of leaching parameters on high ash coal and study the characterization of pre and post-treated coal. The two high ash Indian coal selected from Mahanadi Coalfield Limited, Odisha, pulverized to 375, 230 and 180 µm particle size were undergone simultaneous acid and alkali treatment at a different ...
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temperature sulphuric acid pressure leaching of nickel silicate ore from the deposit "Rudinci". [7] With respect to nickel leaching and selectivity, they obtained satisfactory results. They observed that addition of KMnO 4 during the leaching results in decrease of iron content in the leach solution.
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Sulphuric acid is added to maintain pH. An outline of microbial leaching of copper is shown in Fig. 21.9. Microbial leaching of copper has been widely used in the USA. Australia, Canada, Mexico, South Africa and Japan. In the USA 200 tonnes of copper is recovered per day. Uranium Leaching
MoreSKORPION ZINC: OPTIMISATION AND INNOVATION J. Gnoinski ... 2.1 Leaching Leaching of zinc oxide ores by sulfuric acid are generally described in terms of the Read more Mechanochemical leaching of refractory zinc silicate ...
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Oct 08, 2011 Zinc MetallurgyZINC EXTRACTION PROCESSEST he most important raw material for production of Zinc is Zinc Sulphide (ZnS) orecommonly known as Sphalerite. Next in the importance are Zinc Carbonates (Calamine/Smithsonite) and Zinc Silicate. Most of the zinc production worldwide originatesfrom sulphide ores.The principal processes by which zinc is ...
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The Rammelsberg ore processing involves leaching of a cupellation residue with dilute sulfuric acid. The solution is treated with zinc slabs to obtain crude indium sponge which is further dissolved in acid and indium of four-nine purity (99.99%) cemented by either aluminum strips or a zinc
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