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investigation of steps of ferric leaching and:

Investigation of steps of ferric leaching and biooxidation ...

2014-12-21 · We examined the ferric leaching and biooxidation steps in a two-step biooxidation process of a gold-bearing sulfide concentrate containing pyrrhotite

Investigation of steps of ferric leaching and biooxidation ...

We examined the ferric leaching and biooxidation steps in a two-step biooxidation process of a gold-bearing sulfide concentrate containing pyrrhotite

Investigation of Steps of Ferric Leaching and Biooxidation ...

Investigation of Steps of Ferric Leaching and Biooxidation at the Recovery of Gold from Sulfide Concentrate January 2015 Applied Biochemistry and Microbiology 51(1)

[Investigation of stages of chemical leaching and ...

We examined the chemical leaching and biooxidation stages in a two-stage biooxidation process of an auriferous sulfide concentrate containing pyrrhotite

Investigation of Stages of Chemical Leaching and ...

Chemical leaching of the concentrate (slurry density at 200 g/L) by ferric sulfate biosolvent (initial concentration at 35.6 g/L), which was obtained by microbial

An Investigation into the Ferric Leaching of Chalcopyrite ...

2021-1-24 · An Investigation into the Ferric Leaching of Chalcopyrite - a Sub-Process in the Bioleaching of Chalcopyrite by Elizabeth Geethika Jeevaratnam B.Sc. (Eng.)

Production of a ferric chloride coagulant by leaching an ...

2020-9-1 · The leaching period of time adopted was 15, 30, 60, 120, 240, 360, and 480 min. After the leaching step, the ferric chloride was filtered to remove process

An investigation into the leaching kinetics of cobaltite ...

A method for the extraction of cobalt from cobalt-arsenic-sulfide (cobaltite) ores or concentrates has been identified. The method utilizes an atmospheric oxygen-acidic

Influence of Ferric and Ferrous Iron on Chemical and ...

2013-12-24 · chemical leaching of chalcopyrite was increased 4-fold in the presence of 0.1 M ferrous iron compared with 0.1 M ferric iron. Cordoba . et al. [8] studied the

Leaching of Copper Sulphides - SAIMM

2016-6-8 · This additional step is likely to improve the economics of the circuit if there are sufficient precious metals in the concentrate. Figure 1. Simplified flowsheet

Ferric Chloride Leaching

2018-10-15 · Ferric chloride leaching can be made selective, and more than 99 pct lead extraction can be obtained in 15 min. Additional leaching time increases solubilization of chalcopyrite and sphalerite. Because leaching and filtration were performed batchwise in

An investigation into the ferric leaching of chalcopyrite ...

An investigation into the ferric leaching of chalcopyrite : a sub-process in the bioleaching of chalcopyrite ... Recent research has suggested that different passivating layers are formed during the various stages of chalcopyrite leaching. These include a ferric hydroxy sulfate layer

Ferric chloride leach-electrolysis process for production ...

The new process consists of leaching lead sulfide concentrate with a ferric chloride-sodium chloride solution to produce lead chloride, and fused-salt electrolysis of lead chloride to produce lead metal and chlorine. The chlorine is used to regenerate ferric chloride in the leach solution.

An investigation of the thermodynamics and kinetics of

When the activity ratio of hydrogen ion to ferric ion is low, and especially when the concentration of Fe 3+ is greater than 0.15 M, oxidative dissolution of PbS becomes the controlling reaction. The dissolution can be represented by a shrinking core model with a surface chemical reaction as the rate controlling step.

An investigation into the leaching kinetics of cobaltite ...

A method for the extraction of cobalt from cobalt-arsenic-sulfide (cobaltite) ores or concentrates has been identified. The method utilizes an atmospheric oxygen-acidic ferric sulfate leach, at temperatures up to 373 K (100°C), to place the cobalt in solution. Extraction of 80 pct of the cobalt was obtained within 24 h and the tests indicate that greater and more rapid extractions are ...

Ferric and Cupric Chloride Leaching of Valuable Metals ...

2019-9-30 · Proceedings of EMC 2019 821 Ferric and Cupric Chloride Leaching of Valuable Metals from Process Residues Pelin Altinkaya1, 2, Ivan Korolev1, 2, Eero Kolehmainen1, Mika Haapalainen1, Mari Lundström2 1 Outotec Research Center, P.O. Box 69, Kuparitie 10, 28101 Pori, Finland 2 Aalto University, School of Chemical Engineering, P.O. Box 16200, 002150 Espoo, Finland

Influence of Ferric and Ferrous Iron on Chemical and ...

2013-12-24 · chemical leaching of chalcopyrite was increased 4-fold in the presence of 0.1 M ferrous iron compared with 0.1 M ferric iron. Cordoba . et al. [8] studied the influence of ferric iron on chalcopyrite dissolution at low and high solution potentials and found that although ferric iron was responsible for the oxidation of chalcopyrite, ferrous

Investigation of kinetics and mechanism of the sulfating ...

2018-9-13 · Investigation of kinetics and mechanism of the sulfating roasting process of chalcopyrite concentrate for water-leaching Shahram Daneshpajooh*, Mohammadreza Mozdianfard Department of Chemical Engineering, Engineering Faculty, University of Kashan, Kashan, Iran ... presence and absence of ferric oxide (Fe2O3) [16].

Leaching of Copper Sulphides - SAIMM

2016-6-8 · This additional step is likely to improve the economics of the circuit if there are sufficient precious metals in the concentrate. Figure 1. Simplified flowsheet indicating the integration of total POX in a copper heap leach circuit. Figure 2. Simplified ferric leaching flowsheet. Figure 3. Copper chloride leach process. Leaching

Dissolution mechanism of the oxidation process of ...

2021-5-1 · This process accounts for the hindered dissolution in the late leaching stage. Additionally, from the good leaching findings in 318 K-Fe 2+, the contribution of ·OH in the reaction of Fe 2+ with O 2 during copper-bearing mineral dissolution needs to be carefully considered in future

Ferric ion as a leaching medium (Journal Article) | OSTI.GOV

The new process consists of leaching lead sulfide concentrate with a ferric chloride-sodium chloride solution to produce lead chloride, and fused-salt electrolysis of lead chloride to produce lead metal and chlorine. The chlorine is used to regenerate ferric chloride in the leach solution.

Ferric and Cupric Chloride Leaching of Valuable Metals ...

2019-9-30 · Proceedings of EMC 2019 821 Ferric and Cupric Chloride Leaching of Valuable Metals from Process Residues Pelin Altinkaya1, 2, Ivan Korolev1, 2, Eero Kolehmainen1, Mika Haapalainen1, Mari Lundström2 1 Outotec Research Center, P.O. Box 69, Kuparitie 10, 28101 Pori, Finland 2 Aalto University, School of Chemical Engineering, P.O. Box 16200, 002150 Espoo, Finland

An investigation into the leaching kinetics of cobaltite ...

A method for the extraction of cobalt from cobalt-arsenic-sulfide (cobaltite) ores or concentrates has been identified. The method utilizes an atmospheric oxygen-acidic ferric sulfate leach, at temperatures up to 373 K (100°C), to place the cobalt in solution. Extraction of 80 pct of the cobalt was obtained within 24 h and the tests indicate that greater and more rapid extractions are ...

Influence of Ferric and Ferrous Iron on Chemical and ...

2013-12-24 · chemical leaching of chalcopyrite was increased 4-fold in the presence of 0.1 M ferrous iron compared with 0.1 M ferric iron. Cordoba . et al. [8] studied the influence of ferric iron on chalcopyrite dissolution at low and high solution potentials and found that although ferric iron was responsible for the oxidation of chalcopyrite, ferrous

Speciation of the Sulfuric Acid-Ferric Sulfate-Ferrous ...

2016-11-23 · iii The importance of the cathodic ferric ion reduction reaction on the overall leaching process is progressively increased when increasing the nominal Fe3+/Fe2+ ratio and temperature. Leaching is under anodic control when the nominal Fe3+/Fe2+ ratio is around 1:1, whereas at higher nominal Fe3+/Fe2+ ratios and temperatures it is under mixed control.

Recovery of Silver, Gold, and Lead From a Complex

LEACHING Ferric Chloride Because Wong (7) extensively investi­ gated extraction of lead from galena con­ centrates, only minimal effort was ex­ pended to investigate the FeC13 leaching phase of the process. However, because Wong's work was with a high-grade galena concentrate (74 pct Pb), some research

Kinetics and mechanisms of gold dissolution by ferric ...

Chloride leaching provides major advantages for hydrometallurgical processing, as it supports high metal solubility, enhanced redox po-tentials and high leaching rates (Liddicoat and Dreisinger, 2007). Ac-cording to Abe and Hosaka (2010), ferric ion can be an effective oxidant in chloride media for gold leaching, gold dissolution occurring at ...

Investigation of kinetics and mechanism of the sulfating ...

2018-9-13 · Investigation of kinetics and mechanism of the sulfating roasting process of chalcopyrite concentrate for water-leaching Shahram Daneshpajooh*, Mohammadreza Mozdianfard Department of Chemical Engineering, Engineering Faculty, University of Kashan, Kashan, Iran ... presence and absence of ferric oxide (Fe2O3) [16].

Leaching and Selective Recovery of Cu from Printed

2020-5-25 · the leaching of Cu from PCBs. When the particle size was lower, the leaching e ciency increased. For instance, when the particle size was 0–500 m in size, the leaching e ciency was 67% after 4 h (50 mM ferric sulfate concentration, 20 C, and 150 rpm) of leaching, but when the particle size was

Investigation of kinetics and mechanism of the sulfating ...

2018-9-9 · Investigation of kinetics and mechanism of the sulfating roasting process of chalcopyrite concentrate for water-leaching Shahram Daneshpajooha,*, Mohammadreza Mozdianfarda, Hassan Ebrahimib ... presence and absence of ferric oxide (Fe2O3) [16].

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