sulphuric acid leaching in zinc silicates india

sulphuric acid leaching in zinc silicates india

Sulfuric acid leaching of zinc silicate ore under pressure ...

Dec 01, 2010  They found that neutralization, coagulation and precipitation of silicic acid with Al3+ ions distinctly improved zinc recovery. Subsequently, Bodas (1996) developed a process for leaching zinc silicate ores from Thailand using sulfuric acid as the leachant and Magnafloc 156 as

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.

Pressure leaching of zinc silicate ore in sulfuric acid ...

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.

Pressure leaching of synthetic zinc silicate in sulfuric ...

Jul 01, 2011  Based on equivalent calculations, 94.2 g/L sulfuric acid concentration is the stoichiometric amount required to leach this synthetic zinc silicate, the experimental results show that 100 g/L sulfuric acid was sufficient to extract more than 97% Zn, and no further zinc was leached with more acid.

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.

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...

Leaching and solvent extraction purification of zinc from ...

Jan 15, 2021  Maximum Zn leaching efficiency reached 83.81% at 30% solid, 22.05wt% sulphuric acid concentration, 45 °C, leaching time = 2 h as well as particle size of 300 µm (d 80). In this condition, the ...

Dissolution and Removal of Silicates in Acid Leaching ...

In recent years much emphasis has been placed on the leaching of zinc silicate ores by sulphuric acid, because these are the next best source for zinc after sulphide ores.

Sulphuric acid leaching of zinc and copper from Nigerian ...

Sulphuric acid leaching of zinc and copper from Nigerian Complex sulphide ore also be catalyzed into hydroxyl radicals, which are extremely reactive. The dissolution of ores using sulphuric acid in conjunction with hydrogen peroxide has been studied and successful results were obtained. Jiang et

KINETICS AND MECHANISM OF SPHALERITE LEACHING BY

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

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 ...

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 ...

Kinetics of Pressure Acid Leaching of Zinc from Zinc ...

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 ...

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 ...

Studies on Leaching and Recycling of Zinc from Rayon Waste ...

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.

(PDF) Kinetics of leaching of zinc from sphalerite ...

The recovery of zinc from sphalerite concentrate by oxidative leaching with ammonium, sodium and potassium persulphates in sulphuric acid media is reported in this investigation.

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.

KINETICS AND MECHANISM OF SPHALERITE LEACHING BY

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

Almalyk MMC - Zinc - Sulphuric Acid

Cadmium workshop consists of offices leaching, cementation and dissolution of cadmium sponge, electrolysis of cadmium, cadmium and melting cathode area to obtain technical zinc sulfate. 6. Sulfuric acid plant , recycles waste gases roasting plant to produce sulfuric acid.

(PDF) Ammonia Leaching: A New Approach of Copper Industry ...

Ammonia leaching is being proposed for using in copper metallurgy as an alternative to sulfuric acid leaching [15][16] [17] [18][19]. The main advantages of ammonia leaching of copper-and zinc ...

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

Pressure leaching of zinc silicate ore in sulfuric acid ...

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 ...

Zinc Metallurgy - SlideShare

Since zincsulphide mineral is not easily leached, it is first converted into zinc oxide, which is easilyleached. This is predominantly accomplished by roasting of zinc concentrate in fluid bed roastersand fixation of SO2 bearing off gases thus generated as sulphuric acid by contact process.

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 ...

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 ...

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

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

Kinetics of Pressure Acid Leaching of Zinc from Zinc ...

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 temperature.

KINETICS AND MECHANISM OF SPHALERITE LEACHING BY

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

Zinc Metallurgy - SlideShare

Since zincsulphide mineral is not easily leached, it is first converted into zinc oxide, which is easilyleached. This is predominantly accomplished by roasting of zinc concentrate in fluid bed roastersand fixation of SO2 bearing off gases thus generated as sulphuric acid by contact process.

Almalyk MMC - Zinc - Sulphuric Acid

Cadmium workshop consists of offices leaching, cementation and dissolution of cadmium sponge, electrolysis of cadmium, cadmium and melting cathode area to obtain technical zinc sulfate. 6. Sulfuric acid plant , recycles waste gases roasting plant to produce sulfuric acid.

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,

Nand Kumar Lakhchaura - General Manager - VEIL at Tata ...

• Head Operations of Zinc and sulphuric acid manufacturing processes (Fluid bed Roasting, Acid plant, Leaching, Purification, Electrowinning Moore cake treatment in Kiln at Zinc Smelter Debari. • Streamlining of processes to achieve volume in an environmentally friendly manner.

Copper extraction - Wikipedia

Copper extraction refers to the methods used to obtain copper from its ores.The conversion of copper consists of a series of physical and electrochemical processes. Methods have evolved and vary with country depending on the ore source, local environmental regulations, and other factors.. As in all mining operations, the ore must usually be beneficiated (concentrated).

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

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/(m 2 h) under the conditions of sulfuric acid concentration of 140 g/L, leaching temperature of 160 C, leaching time of 3.0 h, oxy-

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

Sulfuric Acid Leaching on Low Grade Oxide Ore Scientific.Net

In this paper, sulfuric acid leaching was carried out to assess the effect of several parameters on metal extraction in a low grade complex gossan ore in which the grade of zinc and iron is 13% and 40.2%, respectively. Parameters, such as sulfuric acid concentration, liquid to solid ratio and leaching temperature, were studied. The results show that the zinc leaching rate is almost 80%, while ...