In addition to sphalerite, which was the main component, the concentrate contained a small amount of pyrrhotite and an impurity amount of chalcopyrite. The oxidation of these sulfides in ferric sulfate solutions was described by the following simplified reactions: sphalerite: ZnS + 2Fe 3+ → Zn 2+ + S 0 + 2Fe 2+ chalcopyrite: …

The optimal leaching condition was determined as 150 g/L H 2 SO 4, 0.95 times of theoretic amount of sphalerite concentrate for 4 h at 90 °C while using particles in the range of 74–58 μm. The leaching efficiencies were 94.8% of indium, 96.1% of zinc and 92.8% of iron, respectively, and a Fe 2 + /Fe 3 + molar ratio of 7.5 in the leach ...

Section snippets Samples and characterization studies. The sphalerite flotation concentrate was obtained from the Lowshan Processing plant. Particle sizes of a sample range from 150 to 25 μm with a d 80 of 54 μm (Fig. S1). The chemical composition of the representative sample was analyzed using atomic absorption spectroscopy (AAS) …

For example, the nonferrous metal sulfide ore usually contains paragenic galena, sphalerite, and pyrite, and even associated chalcopyrite. The paragenic or associated minerals are numerous and also have very low content. ... Concentrate experiences thickening, filtration, and if necessary, drying, to become concentrate …

Lab-scale experiments of direct leaching of zinc from sphalerite concentrate (D80 particle size = 100 m) were carried out in a 0.5 M sulfuric acid solution at 353 K under …

Carbonate-hosted Pb–Zn deposits frequently contain significant amounts of critical metals such as germanium in sphalerite. However, the textural and chemical controls leading to Ge enrichment remain poorly constrained. Based on textural observations and laser-ablation (multi-collector) inductively coupled plasma mass …

The effect of particle size on the leaching of metal from the zinc concentrate was studied. In these experiments, the initial sulphuric acid concentration 5% (v/v), leaching temperature (333 K), pulp density (10%) and the amount of ammonium persulphate 20% (w/v) were maintained constant as shown in Fig. 1.The results show that the decrease in …

Ternary DES (ChCl:PTSA:EG) can be used for sphalerite concentrate leaching. •. Zinc dissolution improves with higher temperature and time. •. Longer milling boosts …

sphalerite concentrate. Kinetic models were also evaluated to determine the rate-limiting step of the sphalerite leaching; it was concluded that the type of the sulfur layer formed in the residue (porous or non-porous) depends on the type of the oxidant used in the leaching media, which determines the dissolution kinetics of zinc.

Zinc mostly exists in the form of sulfides, mainly including sphalerite (ZnS) and marmatite (nZnS·mFeS). ... Zinc sulfide concentrate is used to reduce the Fe 3+ in the solution into Fe 2+. Conditions: temperature 90–95 °C, sulfuric acid content 50–60 g/, and duration 5–7 h. ... Then thickening will separate iron-lead slag. The zinc ...

Special attention is given to research related to the kinetics and mechanism of sphalerite oxidation in an acidic medium influenced by various oxidants, such as …

Porphyry copper deposits are important sources of copper and typically processed by flotation to produce copper concentrates. As mining areas become deeper, the amounts of impurities, such as sphalerite, can be …

High-temperature ferric leaching is a promising method to improve the recovery of nonferrous metals from sulfide ores and concentrates. In this study, differences in the leaching kinetics of a sphalerite concentrate using chemical and biogenic ferric …

Thickening and Filtering. Both concentrates are thickened and filtered. The thickened lead concentrate is filtered on the Disc Filter. Thickened fluorspar concentrate, at approximately 60% solids here, has a high filter capacity of approximately 2000 pounds per sq. ft. per 24 hours.

In this study different strategies were employed for adapting Acidithiobacillus ferrooxidans cells to both Zn 2+ ions and high grade sphalerite concentrate. The serial subculturing was found to be a very efficient strategy for adapting A. ferrooxidans cells to higher Zn 2+ concentrations, as well as high grade sphalerite …

Thickening and Filtering of Zn and Pb The final lead and zinc concentrates are pumped by concentrate pumps to Thickeners for …

DOI: 10.1016/j.mineng.2022.107792 Corpus ID: 251633300; Comparison of sphalerite concentrate leaching by chemical and microbially produced ferric sulfate @article{Muravyov2022ComparisonOS, title={Comparison of sphalerite concentrate leaching by chemical and microbially produced ferric sulfate}, author={Maxim Muravyov …

The In contents are relatively high in Sp4 and Sp5. This is owing to that the liberated In would concentrate in the fluids and is hard to access to other sulfides other than sphalerite. ... Sphalerite is the main Zn-bearing mineral in ... with different thicknesses for each layer and accompanied by thickening or thinning at different …

Leaching of indium from an indium-and iron-bearing sphalerite concentrate in sulfuric acid– ferric sulfate solution was examined. The effects of various parameters were studied. Increases in the stirring speed, temperature, ferric ion and sulfuric acid concentrations, and decreases in the particle size, enhanced the indium leaching rate. Scanning electron …

The paper deals with bacterial leaching of sphalerite. The data include progress curves for leaching of the concentrate in terms of Zn, Cu, and Cd solubilization. Plots of the Zn and Cu data followed a relationship predicted by a chemical rate equation. Reaction rates for Zn and Cu were inversely related to initial particle size of the concentrate. A pulp density in …

The effect of particle size on the extraction of zinc, indium and iron from sphalerite concentrate is shown in Fig. 1.It shows from Fig. 1 that the extraction percentage of zinc, indium and iron increases significantly as the size of the particles decreases. This effect is due to the increase in the interfacial area of leaching reaction …

This work presents a study for chemical leaching of sphalerite concentrate under various constant Fe 3+ concentrations and redox potential conditions. The effects of Fe 3+ concentration and redox potential on chemical leaching of sphalerite were investigated. The shrinking core model was applied to analyze the experimental results.

Reduction of dissolved ferric iron (Fe 3+) to ferrous iron (Fe 2+) with sphalerite (zinc sulphide) concentrate (Red Dog, Alaska) as the reducing agent was studied in an isothermal batch reactor under nitrogen flow. The influence of temperature (75–95 °C), initial concentration of ferric iron (0.1–0.3 mol/L), reducing agent-to-ferric …

Ferric leaching of ZnS from a Cu-Zn-Pb concentrate is studied. Two kinetics regimes for sphalerite leaching with ferric sulphate are proposed. A non-porous film of S 0 hinders the mass transfer to ZnS surface. The behaviour of ZnS in a bulk concentrate is similar to the rest of studies.

Sphalerite Occurrence. Formed under a wide range of low- to high-temperature hydrothermal conditions; in coal, limestone, and other sedimentary deposits.. Sphalerite, the most important ore of the zinc …

The activation energy of the rate constant kr for the pure sphalerite and zinc concentrate was found to be 66.4 and 67.6 kJ/mol respectively. The dissolution rate increased as the 0.43 power of ...

The leaching of sphalerite concentrate was conducted using a DES with a consistent solid to liquid ratio of 3.6%. The experimental parameters, including temperature, leaching time, and ball milling time, were varied within 40–100 °C, 20–1440 min, and 0–24 h, respectively. For the leaching process, once the DES reached the desired ...

Thickening and Filtering of Zn and Pb. The final lead and zinc concentrates are pumped by concentrate pumps to Thickeners for dewatering prior filtration. The thickener underflow at approximately 50% solids is pumped to a Disc Filter by means of a Diaphragm pump. The filter cakes pass to concentrate bins for storage. Zn Pb Plant Sampling

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. Effects of ...

As a typical solid-gas-liquid suspension with polydispersity and complex interactions inside, the flow and deformation performance of micro-mineral processing slurry is usually determined using non-Newtonian rheology, since it displays common rheological behaviors including shear thickening, shear thinning, shearing yield, and compressing …