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Effects of reagent scheme changes on flotation performance in ÇBİ Mill
Published in Gülhan Özbayoğlu, Çetin Hoşten, M. Ümit Atalay, Cahit Hiçyılmaz, A. İhsan Arol, Mineral Processing on the Verge of the 21st Century, 2017
Various collector mixtures were prepared by mixing different xanthates with Aerophine in different ratios. These collector mixtures were tested in laboratory to determine Cu rougher metallurgy. Xanthates used in lab tests were potassium amyl xanthate (PAX), sodium isopropyl xanthate (SIPX) and potassium amyl xanthate (PEX). Collector dosage was 20 g/t/Cu% and the collector was added to the lab rod mill with lime as in the plant. Flotation pH was adjusted to 11.5 with lime addition to grinding.
Minerals of precious metals
Published in Francis P. Gudyanga, Minerals in Africa, 2020
The conventional comminution (crushing and grinding) is followed by making a fine slurry of the powdered ore and water to which chemicals are added. Potassium amyl xanthate renders the sulphide minerals hydrophobic while carboxymethylcellulose confers hydrophilicity to the waste minerals such as talc.
Gold Ore Processing and Environmental Impacts: An Introduction
Published in Sadia Ilyas, Jae-chun Lee, Gold Metallurgy and the Environment, 2018
The quality and strength of the foam is essential when gliding free gold. There is an impression of there being an inclination for polyglycol ether-construct frothers in light of most Collector structure – singular authorities Cytec reagent subtle elements sodiumisobutyl xanthate AERO 317, potassium amyl xanthate AERO 343, xanthogenformate detailing AERO 3758, diisobutyldithiophosphate AERO 3477, mercaptobenzothiazole AERO 404, monothiophosphate AERO 6697, dithiophosphate definition Reagent S-9810, collector sythesis – mixed gatherers, dithiophosphate/monothiophosphate plan AERO 7249, monothiophosphate/dithiophosphate plan AERO 8761, dithiophosphate/monothiophosphate/dithiophosphinate, definition Reagent S-9913, dithiophosphate/mercaptobenzothiazole detailing AERO 405, dithiophosphate/mercaptobenzothiazole definition AERO 7156, thionocarbamate/dithiophosphate plan AERO 3926, thionocarbamate/dithiophosphate detailing AERO 473, modified thionocarbamate/dithiophosphate details AERO 5744/5, dicresyldithiophosphate plan reagent S-8985, modified thionocarbamate/dithiophosphate/monothiophosphate detailing reagent S-9889, ethyl octyl sulphide definition reagent S-701, and dithiocarbamate/sodium hydrosulfide detailing reagent S-3730 are some of the well-known reagents to be used as frother in gold flotation. At the point when selectivity is required or, on account of copper–gold metals, where a copper think is sold to a smelter, a weaker frother (for example, methyl isobutyl carbinol (MIBC)) is favoured. The decision of a molecule measure adjusted frother additionally is a vital thought in gold buoyancy as this advances composite molecule recuperation in the forager buoyancy circuit. When in doubt, the glycol or polypropylene glycol methyl ether frothers are perfect for this application (Klimpel, 1997). The mixed inter froth frothers have discovered wide acknowledgment in the Australian gold industry (Goold, 1990).
Application of inverse gas chromatography to bench scale flotation of sulphide ore
Published in Canadian Metallurgical Quarterly, 2023
Shiva Mohammadi-Jam, Gilberto Rodrigues da Silva, Kristian E. Waters
The nickel-copper sulphide ore was obtained from Vale’s Discovery Hill ore body (Voisey’s Bay mine, Newfoundland & Labrador, Canada). The ore was crushed in Marcy jaw crusher (Svedala Industries, Inc., U.S.A.), ground in a laboratory disc vibrating mill (T100 Siebtechnik, Germany) and sieved using a Ro-Tap Sieve Shaker (Tyler, U.S.A.) to produce a −106 µm size fraction. Potassium amyl xanthate (PAX) was obtained from Prospect Chemicals (Canada). The xanthate compound was purified by dissolving in acetone, recrystallizing by petroleum ether, and filtering out the precipitation. The purified PAX was stored under ethylene ether. The alkanes used in the surface energy experiments were decane, nonane, octane, and heptane, and the polar probe molecules were toluene and dichloromethane. All chemicals used were of HPLC grade (>99.5% purity), purchased from Sigma–Aldrich (U.S.A.).
Effect of mineral particle size on froth stability
Published in Mineral Processing and Extractive Metallurgy, 2021
Innocent Achaye, Jenny Wiese, Belinda McFadzean
A polypropylene glycol ether frother, Dowfroth 250, was used at a constant dosage of 100 ppm. A high frother dosage was necessary to run all the experiments in the bench scale continuous column under the same conditions, otherwise the froth volume obtained with coarse particles would be insufficient to get an acceptable mass flow to the concentrate. The glass wall does not offer a stabilising effect as it is hydrophilic and drainage was high at the surface. Potassium amyl xanthate (PAX) was used as collector at 25% surface coverage of pyrite, corresponding to a pyrite contact angle of 46°. The collector surface coverage was based on the BET surface area of the pyrite and assuming the cross-sectional area of the thiol head group of xanthate to be 28.8 Å (Grano et al. 1997). The collector dosage was chosen to give an intermediate particle hydrophobicity that would generate some pyrite recovery, but not high enough to destabilise the froth.
An investigation into the recovery of oxide copper from a complex copper ore using sulphidisation technique and hydroxamate and potassium amyl xanthate collectors
Published in Geosystem Engineering, 2020
Ahad Zare, Asghar Azizi, Mohammad Karamoozian
The objective of this study was to investigate the floatability of Sungun complex copper ore using the sulphidisation (slug and CPS) and the hydroxamates anionic collectors. Na2S, NaHS and (NH4)2S was applied as sulfidizer to sulphidise the copper oxide minerals. Also, the efficiency of potassium amyl xanthate (Z6) on the flotation of copper was evaluated. The results indicated that (NH4)2S had better performance as sulfidizer. The most appropriate step for the addition of (NH4)2S was the first step with a value of 300 g/t at pH of 11, stirring rate of 1250 rpm and conditioning time of 2 min. In these conditions, about 9.46% of the recovery of oxide copper improved. The use of hydroxymates as collector led to increase the recovery of oxide copper without having a negative effect on the flotation of sulphide copper, potassium octyl hydroxymate had a better result than sodium octyl hydroxymate and the use of 10 g/t of this collector caused an increase of 6.8% for oxide copper recovery. It was also found that applying Z6 associated with Z11 had a positive effect on the recovery of oxide copper. In addition, the results demonstrated that the highest oxide copper recovery was obtained using the CPS method. About 10.34% of the oxide copper recovery and 4.48% of the total copper recovery increased using this technique, and the consumption amount of (NH4)2S reduced towards slug sulphidisation.