Organic acid leaching of base metals from copper granulated slag and evaluation of mechanism

Meshram, Pratima; Bhagat, Lalit; Prakash, Uday; Pandey, B.D.; Abhilash, .

doi:10.1080/00084433.2017.1293900

Cited by 22 publications

(10 citation statements)

References 12 publications

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“…Experimental flasks were incubated on a rotary shaker at 120 rpm for 0.5-15 h at 308-328 K (35-55 • C). On termination of the experiment, the values of pH and E h were measured with a pH-millivolt meter and contents of the flasks were filtered [15] using Whatman No. 42 paper.…”

Section: Methodsmentioning

confidence: 99%

Processing of Waste Copper Converter Slag Using Organic Acids for Extraction of Copper, Nickel, and Cobalt

et al. 2020

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An innovative, economical, and environmentally sound hydrometallurgical process has been proposed for recovering Cu, Ni, and Co from copper-rich converter slag by organic acids. In the leaching experiments, the effects of organic acid concentrations, pulp density, temperature, and time were investigated. Optimum recovery of 99.1% Cu, 89.2% Ni, 94% Co, and 99.2% Fe was achieved in 9–10 h at 308 K (35 °C) temperature and 15% pulp density with 2 N citric acid using <45 µm particles. Pourbaix diagrams of metal-water-citrate systems were supplemented to examine solubility of ligands at the desired conditions. Furthermore, the leaching mechanism was based on the SEM-EDS (energy-dispersive X-ray spectroscopy) and XRD characterization as well as the leaching results obtained.

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Section: Methodsmentioning

confidence: 99%

Processing of Waste Copper Converter Slag Using Organic Acids for Extraction of Copper, Nickel, and Cobalt

et al. 2020

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“…Hydrometallurgy is considered as the promising way to recover such metals from the copper slag [9][10][11][12][13][14]. Among other hydrometallurgical processes, sulfuric acid leaching is recognized as the most convenient process for this because of the producing huge amount of acid on the metallurgical plants.…”

Section: Introductionmentioning

confidence: 99%

Copper ammonia leaching from smelter slag

Nadirov

Turan

Karamyrzayev

2019

Int. j. biol. chem.

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Copper smelter slag can be considered as an important source for using in the copper hydrometallurgy. Ammonia leaching seems to be attractive for processing copper slag. Under the influence of ammonia, copper, which is part of the minerals of copper, forms soluble ammonia complexes, while iron precipitates as insoluble compounds. In the present work, the possibility of leaching the copper smelter slag (1.26 wt.% Cu) of the Balkhash smelter using NH 4 OH solutions was considered. The effect of experimental factors (leaching duration, reagent concentration, temperature, stirring rate, as well as a solid-to-liquid ratio) on the extraction of copper into solution was studied. It was found that the extraction of copper into solution increases with increasing temperature (in the studied range 298-333 K), pulp density (up to 10 pct) and stirring rate (up to 800 rpm). The concentration of NH 4 OH almost does not affect on the level of copper extraction in the range of 1-4 M. The following experimental conditions provide the recovery of 65% of Cu into ammonia solution: 1M NH 4 OH, T = 333 K, particle size 90% < 200 mesh, solid-to-liquid ratio 10 pct, stirring rate 800 rpm, and leaching duration 180 min, 65% of copper is extracted into the solution. Shrinking core model with mixture kinetics was used to describe the process of ammonia leaching of copper from smelter slag. The activation energy and pre-exponential factor for the reactions of copper dissolution were calculated to be 16.2 ± 0.7 kJ/mol and 0.138 ± 0.001 min-1 , respectively. The relatively low value of the activation energy indicates that the rate of the overall leaching process is controlled mainly by the processes of mass transfer rather than by the rate of chemical reactions of copper dissolution.

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“…This situation has prompted much research on the recovery of copper and other base metals from copper metallurgical slags [2]. Most of the studies on the recovery of copper and other base metals from copper metallurgical slags have been conducted in acidic sulphate media, either in the absence or presence of an oxidant, in both atmospheric and pressure conditions [3][4][5][6][7][8][9]. In contrast, only a few papers have been published on the leaching of copper and other base metals from copper metallurgical slags in ammonia [7,8,10] and acidic chloride solutions [8,11].…”

Section: Introductionmentioning

confidence: 99%

“…However, chloride media are generally known to be more aggressive than sulphate media [12]. In addition, research has been done into bioleaching [13,14] and the effect organic (citric acid) on selective acid leaching [9]. Besides leaching, sulphation roasting of slag with sub sequential water leaching and flotation of the slag remained the two methods to which researchers most focused on copper extraction.…”

Section: Introductionmentioning

confidence: 99%

Dissolution of copper from smelting slag by leaching in chloride media

Dimitrijević

Urošević

Milić

et al. 2017

J min metall B Metall

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Leaching of copper smelting slag in chloride media was studied. The lixiviants used were aqueous solutions of hydrochloric acid (0.5-2.0 M HCl) as well as hydrogen peroxide and hydrochloric acid (0.5-3.0 M H 2 O 2 , 1.0 M HCl). The maximum final copper extraction from the slag of 73% was attained with 3 M H 2 O 2 , at room temperature after 120 minutes of reaction. At the same time, 55% of the iron from the slag was also dissolved. The copper extraction increased during the first 60 minutes of reaction and essentially ceased thereafter. Because of a rapid catalytic decomposition of hydrogen peroxide, it should be added contiuously to the leach suspension rather than at once at the begining of the experiment. In fact, it appears that almost complete dissolution of copper from the slag is achievable after about 4 hours of leaching by implementing the method of continuous lixiviant addition. Also, it seems that the final iron extraction could be limitied to as low as 20% by using this method.

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Organic acid leaching of base metals from copper granulated slag and evaluation of mechanism

Cited by 22 publications

References 12 publications

Processing of Waste Copper Converter Slag Using Organic Acids for Extraction of Copper, Nickel, and Cobalt

Processing of Waste Copper Converter Slag Using Organic Acids for Extraction of Copper, Nickel, and Cobalt

Copper ammonia leaching from smelter slag

Dissolution of copper from smelting slag by leaching in chloride media

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