Leaching kinetics of sphalerite with pyrite in chlorine saturated water

Ekinci, Zafer; Çolak, Sabri; Çakıcı, Avni; Saraç, Hanifî

doi:10.1016/s0892-6875(98)00006-5

Cited by 38 publications

(11 citation statements)

References 8 publications

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“…The results were, also, consistent with Arrhenius Law [3]. Other studies have alluded to this fact [1,25]. Increasing temperature, and decreasing pH and particle size positively influence the extraction of cadmium and copper from the ore [14,26].…”

Section: Discussionsupporting

confidence: 84%

The Leaching of Dolomitic-Copper Ore Using Sulphuric Acid Under Controlled Conditions~!2010-03-15~!2010-06-17~!2010-07-21~!

Ntengwe¹

2010

TOMPJ

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The leaching of dolomitic-copper ore using sulphuric acid under controlled conditions was studied with a view to evaluating the economic value and the effect of ore pulverisation, particle size, temperature and pH on the recovery of copper from chalcopyrite. The samples were ground and mixed with water and sulphuric acid to form an acid soluble copper content of 4.07 %, 8.14 % total copper and 22 % solids. The leaching was carried in duration of 0-6 hours. The sulphuric acid was found to be effective in recovering copper from chalcopyrite with efficiencies of 72 to 93 % for 75 micron particle size and 65 to 84% for the 212 micron sieve size at different pulverising times. The kinetics of dolomitic ore showed the reaction with H 2 SO 4 was second order with respect to chalcopyrite and first order with respect to dolomite and was consistent with the shrinking core model. The increase in temperature produced an increase in the recovery of copper from solids into the bulk solution. The leaching was favoured at low pH values (1.83). Profit levels for the reversed pH numbers, high to low (low to high pH), were higher than values for leaching from low to high pH numbers (high to low pH) particularly for acid sales. Since the economic evaluation showed positive profit levels for both acid and copper sales, the process was viable.

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Section: Discussionsupporting

confidence: 84%

The Leaching of Dolomitic-Copper Ore Using Sulphuric Acid Under Controlled Conditions~!2010-03-15~!2010-06-17~!2010-07-21~!

Ntengwe¹

2010

TOMPJ

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“…The classical models used for solid-uid reactions are the shrinking particle and the shrinking core (product layer) models (Levenspiel, 1972). The shrinking core model has been suggested by many authors to be valid for leaching of sphalerite (Palencia Perez and Dutrizac, 1991;Lochmann and PedlÃ k, 1995;Cheng et al, 1994;Suni et al, 1989;Ekinci et al, 1998;Babu et al, 2002). However, the opinion of the rate-determining step di ers, some authors state that rate is controlled by the chemical reaction, while others propose that the mass transfer through the product layer controls the rate.…”

Section: Introductionmentioning

confidence: 99%

Kinetic modelling of a solid–liquid reaction: reduction of ferric iron to ferrous iron with zinc sulphide

Markus

Fugleberg

Valtakari

et al. 2004

Chemical Engineering Science

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“…If the reaction is controlled by a surface chemical reaction, then the integrated rate equation of this step can be written as follows 7,18 :…”

Section: Fig 4 Effect Of Particle Size On Smithsonite Dissolutionmentioning

confidence: 99%

Dissolution Kinetics of Smithsonite in Sulfamic Acid Solution

Wu¹,

Wen²,

Yang³

et al. 2013

Asian J. Chem.

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Zinc is generally produced from zinc sulfide ores because sulfides are easier to separate from gangue minerals and easier to concentrate via conventional flotation techniques. However, sulphide ores-the primary source of zinc-are becoming depleted. Thus, oxide zinc minerals, such as zincite (ZnO), smithsonite (ZnCO 3 ), willemite (Zn 2 SiO 4 ), hemimorphite [Zn 4 Si 2 O 4 (OH) 2 ·H 2 O] and hydrozincite [Zn 5 (CO 3 ) 2 (OH) 6 ] have recently become important sources of zinc ores 1-3 .A large amount of research has been conducted on the treatment of zinc oxide ores via the hydrometallurgical method. In particular, the leaching kinetics of hemimorphite and willemite has been studied extensively 4 . On the other hand, only few studies investigated the leaching of smithsonite ore. These studies used inorganic acids as leaching reagents 5-9 . Organic acids have been used as leaching reagents in recent years [10][11][12][13] .Previous studies discussed the dissolution kinetics of smithsonite ore in ammonium chloride solution, describing the effects of reaction temperature, ammonium chloride concentration, ore particle size and stirring speed on zinc dissolution rate. The results of these studies demonstrated that the zinc leaching of ca. 91.2 % by using 84-110 mm ore particle size at a reaction temperature of 90 ºC for a 240 min reaction time with 5 mol/L ammonium chloride.This study investigated the dissolution kinetics of smithsonite by using sulfamic acid solution as an alternative leaching agent. Moreover, the effects of certain experimental parameters on the dissolution of smithsonite were investigated using a kinetic model. The dissolution rate was found to increase with increasing solution temperature, acid concentration and stirring speed, as well as with decreasing particle size. Moreover, the dissolution rate can be controlled by the shrinking core model for surface chemical reactions. The activation energy of the dissolution process was determined to be 42.86 kJ/mol. The results indicated that sulfamic acid solution could be used as a leaching agent for zinc extraction in smithsonite.

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Leaching kinetics of sphalerite with pyrite in chlorine saturated water

Cited by 38 publications

References 8 publications

The Leaching of Dolomitic-Copper Ore Using Sulphuric Acid Under Controlled Conditions~!2010-03-15~!2010-06-17~!2010-07-21~!

The Leaching of Dolomitic-Copper Ore Using Sulphuric Acid Under Controlled Conditions~!2010-03-15~!2010-06-17~!2010-07-21~!

Kinetic modelling of a solid–liquid reaction: reduction of ferric iron to ferrous iron with zinc sulphide

Dissolution Kinetics of Smithsonite in Sulfamic Acid Solution

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