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Sulfuric acid leaching of zinc silicate ore under pressure

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 0.44 mol/L is sufficient to extract more than 99% zinc and dissolve about 8.8% iron and 16.1% silica in 60 min. No further zinc was leached with more

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Kinetics of sulphuric acid leaching of a zinc silicate calcine

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.

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Kinetics of sulfuric acid leaching of low-grade zinc

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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Dissolution and Removal of Silicates in Acid Leaching

It was found that a maximum zinc extraction (95% Zn) was obtained at a 4.5 M concentration of sulphuric acid in 3 h leaching at 70°C, keeping the solid:liquid weight ratio at 1:5 Iron and

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US4070260A Process of sulfuric acid leaching silicated

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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Pressure leaching of synthetic zinc silicate in sulfuric

Jul 01, 2011· Xu et al. (2010) also studied sulfuric acid leaching of zinc silicate ore under pressure, and the experimental results obtained show that the pressure leaching can selectively separate valuable zinc from silica and iron. Willemite and hemimorphite are two universal types of zinc oxide ore as expressed in Eqs.

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Hydrometallurgical treatment of zinc silicate ore from

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

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The Precipitation of Silica from Acidic Zinc Leach Liquors

Batch precipitation studies of silica from sulfuric acid solutions have revealed valuable information about the processes occurring. 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

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Leaching of Metals from Hydrometallurgical Residue by

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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Precipitation of silica from zinc process solution

Nov 16, 2017· Precipitation of silica in concentrated sulfuric acid solutions was studied with laboratory-scale batch experiments. The effects of initial silicic acid concentration, temperature, and sulfuric acid concentration were studied. It was observed also in this work that the high ionic strength of the leaching solution drastically decreased the solubility of silica.

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Kinetics of Sulfuric Acid Leaching of Low-Grade Zinc

Bodas [4] performed leaching of zinc silicate ore by sulfuric acid and found that the maximum zinc extraction (95% Zn) was obtained at a 4.5 M concentration of sulfuric acid in 3 h of leaching at

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Pressure leaching of synthetic zinc silicate in sulfuric

The pressure leaching of synthetic zinc silicate is studied in the present paper. Five key parameters were explored, namely, sulfuric acid concentration, the final pH of leaching pulp, leaching

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Recovery of Zinc from Zinc Oxide Ore by Sulfuric Acid Leaching

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

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Process of sulfuric acid leaching silicated zinc ores

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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Precipitation of silica from zinc process solution

Nov 16, 2017· Precipitation of silica in concentrated sulfuric acid solutions was studied with laboratory-scale batch experiments. The effects of initial silicic acid concentration, temperature, and sulfuric acid concentration were studied. It was observed also in this work that the high ionic strength of the leaching solution drastically decreased the solubility of silica.

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Leaching and solvent extraction purification of zinc from

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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(PDF) Leaching of zinc from a lead-zinc flotation tailing

Ferric sulphate/sulfuric acid leaching of zinc from a Pb-Zn flotation tailing sample was investigated in detail. 0.5 mol L -1 ferric sulphate was found to be enough to dissolve both oxidized and

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Production Zinc India

In a leaching stage the zinc oxide is separated from the other calcines. sulfuric acid is used to do this. The zinc content dissolves whereas iron precipitates and lead and silver remain undissolved. However, the dissolved solution contains some impurities which need to be eliminated in order to obtain a high-purity zinc product at the end of

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The Effect of Zinc Ion Concentration and pH on the

liquid boundary film, despite the possible change in solution viscosity caused by silica gel formation. Jarupisitthorn et al. (2002) also observed similar results as they studied the effect of stirring speed. Finally, Abdel-Aal (2000) studied the effect of particle size on kinetics of sulphuric acid leaching of low grade zinc silicate ore.

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LEACHING OF LOW-GRADE COPPER ORES: A CASE STUDY

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

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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Kinetic Analysis of Isothermal Leaching of Zinc from Zinc

soda. Other workers studied the dissolution of zinc from zinc silicate ore [12-14] and carbonate ore [15]. Abdel-Aal [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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Studies on Leaching and Recycling of Zinc from Rayon Waste

Zinc is an important nonferrous metal used in various metallurgical, chemical, and textile industries. In textile industries, a waste sludge containing zinc hydroxide is generated during the manufacture of rayon yarn. The two sludge samples were used for the experimental work. The National rayon contained a high value of zinc (18.90%), 13.0% Ca, and 7.63% Si, whereas the sample from Baroda

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leaching of zinc ore at skorpion

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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Production Zinc India

In a leaching stage the zinc oxide is separated from the other calcines. sulfuric acid is used to do this. The zinc content dissolves whereas iron precipitates and lead and silver remain undissolved. However, the dissolved solution contains some impurities which need to be eliminated in order to obtain a high-purity zinc product at the end of

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The Effect of Zinc Ion Concentration and pH on the

liquid boundary film, despite the possible change in solution viscosity caused by silica gel formation. Jarupisitthorn et al. (2002) also observed similar results as they studied the effect of stirring speed. Finally, Abdel-Aal (2000) studied the effect of particle size on kinetics of sulphuric acid leaching of low grade zinc silicate ore.

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Precipitation of silica from zinc process solution

Nov 16, 2017· Precipitation of silica in concentrated sulfuric acid solutions was studied with laboratory-scale batch experiments. The effects of initial silicic acid concentration, temperature, and sulfuric acid concentration were studied. It was observed also in this work that the high ionic strength of the leaching solution drastically decreased the solubility of silica.

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InternationalJournal of Mineral Processing

for leaching of both willemite and hemimorphite in different acidic media. They found that the dissolution was mixed chemical/diffusion controlled in hemimorphite and chemically controlled in the case of willemite. Abdel-Aal (2000) investigated the kinetics of sulfuric acid leaching of low- grade zinc silicate

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LEACHING OF A Cu-CoORE FROM CONGO USING

Variation of solution Eh and pH during the leaching, (a) 0.732M sulphuric acid at 20oC and (b) 0.732M sulphuric acid and (0.018-0.054M) hydrogen peroxide at 20 and 25oC. Figure 3.X-ray diffraction peaks of hand-picked grains of minerals (green malachite and gray heterogenite) Table 1. XRF Analysis (%) of samples of different size fractions

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Silica precipitation from electrolytic zinc solutions.

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

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LEACHING Zn FROM THE LOW-GRADE ZINC OXIDE ORE IN

temperature, leaching time, stirring speed and liquid-to-solid ratio on the zinc leaching from low-grade zinc oxide ore in a NH3-H3C6H5O7-H2O system were studied. The results showed that the zinc leaching rate is only 4.7% when the citric acid concentration is 0 M, and the leaching efficiency of Zn increased with increasing

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leaching of zinc ore at skorpion

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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LEACHING OF LOW-GRADE COPPER ORES: A CASE STUDY

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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INFLUENCE OF CHALCOPYRITE STRUCTURE ON THEIR

During the chalcopyrite leaching by sodium nitrate and sulfuric acid solution, leaching rate decreases with increasing the time and a part of chalcopyrite mineral grains remains in the leach residue. In chalcopyrite concentrate, 95.5 % of chalcopyrite mineral occurs as in liberated grains, and the rest is in association with gangue minerals,

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Recovery of Zinc and Silver from Zinc Acid-Leaching

May 31, 2021· Zinc-leaching residue (ZLR) is a strongly acidic hazardous waste; it has poor stability, high heavy metal levels, and releases toxic elements into the environment. ZLR has potential as a valuable resource, because it contains elevated levels of zinc and silver. In this paper, the recovery of zinc (Zn) and silver (Ag) from ZLR wastes from zinc hydrometallurgy workshops using water leaching

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Leaching behavior of zinc and copper from zinc refinery

The results obtained also show that the leaching rates of zinc and copper are 98.1% and 98.7%, respectively, and that the filtration speed is 526.32 L/(m2·h) under the conditions of sulfuric acid concentration of 140 g/L, leaching temperature of 160°C, leaching time of 3.0 h, oxygen partial pressure of 0.75 MPa, stirring speed of 600 r/min

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INVESTIGATION OF THE KINETICS OF SULPHURIC ACID

until leaching zinc from sulphuric acid. However, zinc-rich calamine-containing ore of the Schаimerden de-posit is not actually used to leach zinc to sulphuric acid from it. Today, the ore is used in the costly Waelz pro-ISSN 0543-5846 METABK 60(1-2) 113-116 (2021) UDC UDK 669.5:549.1:661.25:66.067:536.777=111

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Experimental Study on Valuable Metals Dissolution from

Due to the influence of silica gel which was obtained in beginning of leaching, the higher the concentration of sulfuric acid is not conducive to dissolution of the valuable metal elements. The dissolution degree of Fe, Cu, Co and Ni were 92.83%, 96.76%, 93.62% and 63.41% respectively.