Bench-scale flotation of chrysocolla with n-octanohydroxamate

Hope, Gregory Alan; Numprasanthai, Apisit; Buckley, Alan N.; Parker, Gretel K.; Sheldon, Guy D.

doi:10.1016/j.mineng.2012.02.002

Cited by 30 publications

(3 citation statements)

References 5 publications

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“…These chelating collectors, such as 1-phenylthiosemicarbazide and potassium octyl hydroxamate, can be used to change the contact angle of the chrysocolla's surface [13]. Hope et al [14,15] also confirmed that n-octanohydroxamate can act as a collector because the formation of multiple layers of copper hydroxamate can result in good chrysocolla recovery. These collectors exhibit superior affinities for copper oxide minerals, but their poor selectivity for gangue minerals and the expensive reagents restrict their industrial application.…”

Section: Introductionmentioning

confidence: 98%

Effect of Ethylene Diamine Phosphate on the Sulfidization Flotation of Chrysocolla

Shen

Liu

et al. 2018

Minerals

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Abstract:In this study, ethylene diamine phosphate (EDP) was employed as an activator to improve the sulfidization and flotation of chrysocolla. The micro-flotation experiment results indicated that EDP could greatly increase the flotation recovery of chrysocolla. BET and TEM measurements confirmed that the porous structure of the chrysocolla's surface would lead to large amounts of the reagents. ICP-AES analysis revealed that the addition of EDP caused more active Cu sites formed on the chrysocolla's surface, enhancing the adsorption of S 2− on its surface. Meanwhile, a redox reaction occurred between the S 2− and [Cu(en) 2 ] 2+ ions causing the Cu, S, and N in the solution to counter-adsorb onto the chrysocolla's surface by forming new complexes. During this reaction, the Cu(II) species reduced to Cu(I) species and the sulfide ions in the form of S 2− , S 2 2− , S n 2− , and SO 4 2− appeared on the mineral surface. The zeta potential measurements further revealed that the EDP-activated chrysocolla surfaces adsorbed more sulfide species and xanthate species, thereby improving the floatability of the chrysocolla.

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Section: Introductionmentioning

confidence: 98%

Effect of Ethylene Diamine Phosphate on the Sulfidization Flotation of Chrysocolla

Shen

Liu

et al. 2018

Minerals

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“…Chrysocolla interacts well with the sulfhydryl collectors commonly used for copper sulfide flotation, but floats only poorly or very slowly. Research efforts have been made to improve the flotation of chrysocolla [10][11][12][13][14]. Banza and Gock obtained covellite (CuS) and sodium silicate via mechanochemical reaction between chrysocolla and sodium sulfide [15].…”

Section: Introductionmentioning

confidence: 99%

Ammoniacal Solvoleaching of Copper from High-Grade Chrysocolla

Gijsemans

Roosen

Riaño

et al. 2020

J. Sustain. Metall.

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The copper silicate ore chrysocolla forms a large potential copper resource, which has not yet been fully exploited, due to difficulties associated with its beneficiation by flotation and metallurgical processing. Direct acid leaching of chrysocolla causes silica gel formation. Therefore, in this work, the feasibility of solvometallurgical methods to leach copper from high-grade chrysocolla while avoiding issues with silica gel formation was assessed. Ammoniacal solvoleaching was performed with a solvent comprising the chelating extractant LIX 984 N or the acidic extractant Versatic acid 10 in an aliphatic diluent (ShellSol D70 or GTL Fluid G70), combined with a small volume of aqueous ammonia. In the three-phase system, aqueous ammonia dissolves copper from milled and sieved chrysocolla, while copper is simultaneously extracted to the organic phase, releasing ammonia that can be reused for further extraction. The best results were obtained with LIX 984 N as extractant: using a 50 vol% LIX 984 N solution, about 75% of copper could be extracted after 60 min of leaching at 25 °C. The stripping of copper from the pregnant leach solution was optimized. Quantitative stripping of copper was achieved with 1.89 M sulfuric acid and the final aqueous solution of copper sulfate had a concentration of 33 g L−1. Experiments in a leaching reactor (1 L) and small battery of mixer-settlers (3 stages, 35 and 143 mL effective volume in the mixer and the settler, respectively, per stage) were successfully conducted and allowed to recover copper with a purity of 99.9%. A conceptual flow sheet has been developed. Graphical Abstract

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“…Oxidized copper ores are found in silicate or carbonate forms (Hope et al, 2012), malachite being a typical oxide mineral of zinc. Flotation is the commonly used method for beneficiation of malachite and other oxidized copper minerals (Li et al, 2015).…”

Section: Introductionmentioning

confidence: 99%

Archives of Mining Sciences

Liu¹,

Feng²,

Zhang³

2018

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The effect of ammonium sulfate on the sulfidation flotation of malachite was investigated by micro-flotation tests, scanning electron microscope (SEM) and energy dispersive spectrometer (EDS) measurements. Micro-flotation results show that the sodium sulfide concentration and strring time are difficult to control on the sulfidation flotation of malachite. However, when ammonium sulfate was used, the detrimental effect of mixing time and high dosage of sodium sulfide on the sulfidization flotation of malachite can be efficiently eliminated. SEM results showed that sulfidized film on malachite in the presence of ammonium sulfate, and EDS analysis results showed that more S element absorbed and distributed equality on the malachite surface, which was agreed well with the macro-flotation results.

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Bench-scale flotation of chrysocolla with n-octanohydroxamate

Cited by 30 publications

References 5 publications

Effect of Ethylene Diamine Phosphate on the Sulfidization Flotation of Chrysocolla

Effect of Ethylene Diamine Phosphate on the Sulfidization Flotation of Chrysocolla

Ammoniacal Solvoleaching of Copper from High-Grade Chrysocolla

Archives of Mining Sciences

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