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A Study on Leaching of Zinc Oxide Ore in Ammonium …

In this paper, the leaching effect of zinc oxide ore was investigated using ammonium sulfate solution as leaching agent. The effects of temperature, concentration of ammonium sulfate, average particle size and stirring speed on the leaching of zinc …

LEACHING Zn FROM THE LOW-GRADE ZINC OXIDE ORE …

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, …

Leaching performance of low grade zinc oxide ore in the ...

technology for zinc oxide ore, which is approved by a lot of researchers made both at home and abroad. Particularly, the ammonia leaching and its joint technology is the main development direction concerning the low grade zinc oxide ore [2,3,4,5]. The zinc oxide ore from Kashi, Xinjiang Autonomous Region is a typical low grade one with

Leaching and solvent extraction purification of zinc from ...

2021-1-15 · An integrated hydrometallurgical process was used for the zinc leaching and purification from a zinc ore containing 9.75 wt% zinc. The zinc minerals in the ore were hemimorphite, willemite, and ...

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

2010-12-1 · 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 slightly.

Production of zinc and lead concentrates from lean ...

2011-12-1 · The lean zinc oxidized ore was firstly ground to a size below 0.2 mm, followed by alkaline leaching at 90 °C for 120 min in NaOH solution, in which both zinc and lead are effectively extracted. Lead concentrates were then highly selectively and quantitatively produced from the leach solution by adding sodium sulfide as precipitant.

Extraction of gallium and germanium from zinc refinery ...

2016-9-1 · The leaching of silicon increased from 0.12% to 3.56% when the L/S ratio increased from 4 to 10. It has been demonstrated that silica gel is easy to generate with a high L/S ratio and high acid concentration in the leaching of zinc silicate ore (Hua et al., 2002, Harbuck, 1993, Bodas, 1996). Therefore, the leaching behaviors of silica vary with ...

Technological Research of Zinc Extraction from Elazığ ...

In this study, the exraction of zinc from simitsonite (ZnCO 3) ore was investigated.The effect of various leaching parameters on the zinc dissolution was studied. Investigating leach parameters are leaching temperature (298-338K), leaching time (5-360min), sulphuric acid concentration (0.1-4M), particle size (-16, -200 mesh), liquid-solid ratio (5-100ml/g) and constant stirring speed (600rpm).

The Effect of Zinc Ion Concentration and pH on the ...

2017-2-4 · Since zinc is more reactive than iron, two reaction mechanisms could have possibly been occurring at the same time, i.e., the dissolution of zinc oxide ore by sulfuric acid and the displacement of iron in solution by zinc in zinc oxide forming iron hydroxide. Keywords: dissolution kinetics; leaching; zinc ions; zinc oxide 1.0 INTRODUCTION

Leaching of a zinc ore and concentrate using the Geocoat ...

This is compared to leaching with a strain of the mesophile Acidithiobacillus ferrooxidans, which has been adapted to the high levels of zinc and the presence of the low-grade ore, and which was ...

Catalytic-Oxidative Leaching of Low-Grade Complex Zinc …

The catalytic-oxidative leaching of a mixed ore, which consists of low-grade oxide copper ore and oxide zinc ore containing ZnS, was investigated in ammonia-ammonium sulfate solution. The effect of the main parameters, such as mass ratio of copper ore to zinc ore, liquid-to-solid ratio, concentration of lixivant, leaching time, and temperature, was studied.

Leaching behaviour of zinc from a smithsonite ore in ...

2019-2-5 · Keywords: alkaline leaching, calcium zincate, nonsulfide zinc ore, smithsonite, zinc carbonate 1. Introduction Zinc is an industrially important bluish-white, lustrous, low boiling point metal, and often used for galvanization and alloying. It has a valence of +2 and may form complexes with ammonia, halide ions, etc. (Graf, 2005; ILZSG, 2017).

(PDF) Leaching of a zinc ore and concentrate using the ...

Leaching of a zinc ore and concentrate using the Geocoat™ technology. Minerals Engineering, 2011. D. Soleimani. Download PDF. Download Full PDF Package. This paper. A short summary of this paper. 37 Full PDFs related to this paper. Read Paper.

Research on Leaching Performance of Low Grade Zinc …

Leaching test on the oxidized zinc ore from Kashi, Xinjiang Autonomous Region is studied in the (NH 4 ) 2 SO 4 -NH 3 -H 2 O system; Systematic studies are made to show the effects of various factors on the leaching rate of zinc. The optimum conditions for leaching is finally confirmed, i.e., the grinding fineness is 80% -74um, concentration of ammonium sulfate is 2mol/L, concentration of ...

CN1236081C

The present invention relates to technology for leaching zinc oxide ore, particularly to a method for leaching zinc ore containing high iron and silicon, which belongs to the technique of wet metallurgy. The method of the present invention comprises: neutral leaching: zinc oxide ore powder and sulfur acid solution are simultaneously added and by stirred, the initial pH value of acid is from 3 ...

(PDF) HYDROMETALLURGICAL TREATMENT OF NON …

Leaching of low grade ore (5.7% Zn) gave a lower zinc recovery (80%) compared to the high grade ore. This may be due to the presence of very large quantity of silica in the …

Direct Leaching of Low-Grade Zinc Oxide Ore Containing ...

2019-3-16 · Consumption of zinc metal has been rapidly increased in the world. Zinc metal exists as oxide, sulfide, carbonate and silicate ores, among which zinc oxide ores have not been mined because it is very difficult to separate zinc from gangue or to concentrate using the conventional flotation processes. In the current study, a low-grade zinc oxide ore containing 5.9% Zn, 33.4% Fe and 13.7% Mn was ...

Alkaline Leaching of Low Grade Complex Zinc Oxide Ore ...

Alkaline leaching is an important way for treating low grade metal oxide ore, which has some advantages such as low corrosion and low pollution compared to acidic leaching. In order to recover the zinc from a low grade complex zinc oxide ore in which the grade of Zn and Fe are 13 wt.% and 40.2 wt.%, respectively, and 52.8% of Zn is contained in siderite, 34.63% in limonite and 11.55% in ...

Zinc Pressure Leaching (ZPL)-Zinc

Home > Metal Extracting > Zinc. Zinc Pressure Leaching (ZPL) There are many applications of pressure leaching, mature technology of aluminum oxide extraction, nickel extraction from nickel sulfide ore and lateriate-nickel ore as well as zinc leaching especially from sphalerite. It is further prolonged to copper metallurgy, rare metal extraction ...

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.

HYDROMETALLURGICAL TREATMENT OF NON-SULFIDE …

2016-5-17 · Abstract: Acid leaching of Egyptian zinc ore from the Um Gheig area was carried out with sulfuric acid. This study determines the optimum conditions for dissolution of non-sulfide zinc ore. The optimum conditions are 25% -74 m particle size, 45 °C temperature, 2 h leaching time, 1.1 stoichiometric molar ratio of H 2 SO

Alkaline leaching Zn and its concomitant metals from ...

2009-7-1 · Affecting factors, such as ore size, leaching temperature, holding time, alkaline concentration and liquid: solid ratio (volume/weight) (L/S), were studied to leach refractory hemimorphite [Zn 4 (Si 2 O 7)(OH)·H 2 O] zinc oxide ores with NaOH solution in this paper. The impact of leaching recovery of Zn and its concomitant metals was checked through experiments.

Alkaline leaching Zn and its concomitant metals from ...

Abstract Affecting factors, such as ore size, leaching temperature, holding time, alkaline concentration and liquid: solid ratio (volume/weight) (L/S), were studied to leach refractory hemimorphite [Zn4(Si2O7)(OH)·H2O] zinc oxide ores with NaOH solution in this paper. The impact of leaching recovery of Zn and its concomitant metals was checked through experiments.

Extraction of Zinc from Smithsonite by Ammonia Leaching

2020-1-8 · The aim of the study was extraction of zinc from smithsonite by ammonia leaching on cerussite flotation tailings. Initial lead and zinc grades of the ore were 13.31% and 27.86%, respectively. As a result of a series of cerussite flotation tests, a lead concentrate containing 63.25% Pb was produced with 82.76% recovery. After that,

Leaching of Lead and Zinc from a Low-Grade Oxide Ore …

2021-9-20 · ABSTRACT: Leaching of a low-grade lead and zinc oxide ore was studied by an organic reagent, citric acid. The quadratic mathematical models were developed for the relationship among the influential parameters and lead and zinc recoveries. Leaching rate was strongly affected by the interactive effects of factors.

METHOD FOR LEACHING ZINC FROM A ZINC ORE

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[PDF] Leaching and solvent extraction purification of zinc ...

An integrated hydrometallurgical process was used for the zinc leaching and purification from a zinc ore containing 9.75 wt% zinc. The zinc minerals in the ore were hemimorphite, willemite, and calcophanite. Main gangue minerals were quartz, goethite, hematite, and calcite. Central composite design (CCD) method was used to design leaching experiments and the optimum conditions were found as ...

© University of Science and Technology Beijing and ...

2021-4-27 · zinc oxidized ore, wollastonite, blast furnace slag and so on[1 0,34-37]. To realize the comprehensive utilization of zinc oxidized ore, an improved and effective process was developed. First, the mixture of zinc oxid ore andized (NH 4) 2SO 4 was roasted. After water-leaching and filtration, zinc and small amounts of iron entered into the filtrate

Bioleaching Experiments on a Low-Grade Complex Zinc …

When dealing with a low-grade complex Zinc ore from Inner Mongolia, problems of low leaching rate, high energy consumption, low economic benefits and pollution were encountered. To treat this low-grade zinc ore economically and effectively, bioleaching was used. This approach produces reliable data for an environmentally friendly and efficient processing of the zinc ore.