A model of conditioning in the flotation of a mixture of pyrite and chalcopyrite ores

Kuopanportti, H.; Suorsa, Teemu; Dahl, Olli; Niinimäki, Jouko

doi:10.1016/s0301-7516(00)00003-x

Cited by 29 publications

(6 citation statements)

References 11 publications

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“…However, longer conditioning time (10 min) had a slightly negative influence on the flotation recoveries obtained with the straight-chain xanthates, while the flotation recovery values with SIPX and SIBX enhanced more than those obtained with 5 min of conditioning. It has been previously reported by Kuopanportti et al, 2000 that the adsorption of xanthates on a mineral surface is a rapid process and takes place in a few minutes. Thus, overconditioning in the presence of straight chain xanthates resulted in hydrophobic aggregation of galena particles.…”

Section: Resultsmentioning

confidence: 89%

“…The success of the flotation process is largely determined by the interaction of xanthates with the target mineral particles and is mainly dependent on the characteristics of the xanthate and mineral, pH, conditioning time, collector concentration, and so forth. 35 Thus, in order to determine the effect of conditioning time on flotation recovery, the flotation recovery responses of galena with 2.5−10 min conditioning intervals were investigated in the presence of 2.5 ppm collector concentration (100 mL) above neutral pH conditions, with over variables held constant. The results of flotation tests are shown in Figure 4a−c for 2.5, 5, and 10 min conditioning intervals.…”

Section: Resultsmentioning

confidence: 99%

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Determination of Optimum Parameters for Flotation of Galena: Effect of Chain Length and Chain Structure of Xanthates on Flotation Recovery

Özün

Ergen

2019

ACS Omega

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The structure of the xanthates’ hydrocarbon (C–H) chain is one of the major factors which affect flotation recovery. The effectiveness and the collecting power of xanthates increase with increasing chain length and vary depending on the chain structure: branched and straight chains. In this regard, the influences of length (2–5 carbon) and structure (straight: normal and branched: iso) of xanthate’s hydrocarbon chain on flotation recovery of galena were investigated under different experimental conditions: xanthate concentration, conditioning time, air flow rate (AFR), and air bubble size. Because of the steric effects of the chain structure, the branched chain xanthates gave lower flotation recoveries with shorter conditioning times compared to those with straight chain xanthates. Over-conditioning with straight chain xanthates resulted in hydrophobic aggregation of galena particles which resulted in the detachment of galena particles from air bubbles due to increasing weight, leading to lower flotation recoveries. In the case of flotation with different AFRs, the flotation recoveries increased with increasing AFR to 7 lph and further increase in AFR (10 lph) negatively affected the flotation recoveries when particles had insufficient hydrophobic surfaces. The maximum flotation recoveries were obtained with the addition of MIBC (methyl isobutyl carbinol) as a frother; the size of the air bubbles deceased with increasing MIBC concentration which increased higher encounter/collision probability of air bubbles with galena particles, resulting in higher flotation recoveries.

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Section: Resultsmentioning

confidence: 89%

Section: Resultsmentioning

confidence: 99%

Determination of Optimum Parameters for Flotation of Galena: Effect of Chain Length and Chain Structure of Xanthates on Flotation Recovery

Özün

Ergen

2019

ACS Omega

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“…It is believed that oxygen in the pulp helps in xanthate adsorption (Woods, 1976) and oxidation to dixanthogen (Finkelstein, 1967), whilst at high concentration it inhibits xanthate adsorption because of metal hydroxide formation at the mineral surface (Pomianowski and Leja, 1963). That is, increasing oxygen content increases the Eh, which enhances xanthate interaction with the mineral surface (Kuopanportti et al, 1997(Kuopanportti et al, , 2000. Silver content has an effect on the potential at which ethyl xanthate reacts with gold-silver alloy.…”

Section: Collector Adsorption On Free Goldmentioning

confidence: 99%

Challenges and opportunities in the recovery/rejection of trace elements in copper flotation-a review

Agorhom

Lem

Skinner

et al. 2015

Minerals Engineering

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“…The significant improvement was due to a combined effect of all the factors discussed previously: strong pyrite depression caused by the surface oxidation (Leppinen et al 1988, Smart 1991, Mielczarski et al 1998, an increased collector adsorption rate on copper and gold surfaces due to the higher Eh and DO (Kuopanportti et al 2000, Allan and Woodcock 2001, Srdjan 2010, and the surface oxidation of chalcopyrite producing hydrophobic species (Zheng and Manton 2010). The surface oxidation of pyrite can be proved by the XPS analysis.…”

Section: Regrinding Without Nitrogen Purgingmentioning

confidence: 81%

“…It has been reported that oxygen is necessary for copper and gold flotation with xanthate as the collector, because xanthate adsorption cannot proceed without oxidation (Kuopanportti et al 2000, Allan and Woodcock 2001, Srdjan 2010. Although the effect of oxygen on the adsorption of thionocarbamate collector used in this study has not been extensively studied, oxidation should also be essential for its adsorption on copper and gold minerals (Leppinen et al 1988).…”

Section: Matching Plant Performance In the Laboratorymentioning

confidence: 99%

The effect of regrinding chemistry and particle breakage mechanisms on subsequent cleaner flotation

Chen¹

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Regrinding rougher flotation concentrates is typically used to liberate valuable minerals from gangue prior to the cleaner separation stage in processing of low grade ores. Compared to the rougher flotation after primary grinding, it is usually more challenging to achieve a satisfactory performance in post-regrind cleaner flotation especially when fine particles are generated. One main factor which results in this reduction in flotation is the unsuitable particle surfaces produced after regrinding. However, this factor is not usually considered when designing and optimizing the regrinding process.Extensive studies have demonstrated that grinding chemistry can influence mineral floatability.However, earlier studies focused on primary grinding and rougher flotation rather than regrinding and cleaner flotation. In addition, different types of regrind mills are used in industry, and these provide different particle breakage mechanisms which may also influence mineral floatability.Therefore, the overall objective of this thesis study is to investigate the effects of regrinding chemistry and particle breakage mechanisms on the cleaner flotation. The implementation of regrinding in the copper and pyrite flotation circuits at Telfer gold mine was taken as a case study and four research areas were addressed with the objective of developing fundamental understanding to provide practical guidance for the plant operation. The four areas investigated are:1. Effect of regrinding chemistry on copper activation of pyrite and its flotation; 2. Separation of different copper sulphide minerals from pyrite after regrinding; 3. Importance of pulp chemistry during regrinding rougher concentrates; 4. Effect of particle breakage mechanisms on subsequent flotation.In this study, it was found that copper activation of pyrite and its flotation in the cleaner stage were affected by regrinding. In general, a decrease in surface concentration of collectors due to the increased surface area after regrinding contributed to the low pyrite recovery in the cleaner. Surface analysis revealed that both the surfaces that were carried from the rougher flotation concentrate and those which were freshly created were modified by the strong electrochemical reactions occurring inside the regrind mill. Stainless steel media promoted pyrite oxidation, especially on the copper activated surfaces. Mild steel media produced a greater amount of iron oxidation species which could adsorb on the carried surfaces. It was also found that mild steel media generated a reducing condition which favoured the copper activation on the freshly created surfaces.ii The research has also shown that the separability of chalcopyrite and chalcocite from pyrite was significantly different after regrinding, which was related to their electrochemical properties.Chalcocite was more active and therefore presented a stronger galvanic interaction with pyrite.Consequently chalcocite was more oxidised, which not only depressed its flotation but also produced sufficient copper ions...

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A model of conditioning in the flotation of a mixture of pyrite and chalcopyrite ores

Cited by 29 publications

References 11 publications

Determination of Optimum Parameters for Flotation of Galena: Effect of Chain Length and Chain Structure of Xanthates on Flotation Recovery

Determination of Optimum Parameters for Flotation of Galena: Effect of Chain Length and Chain Structure of Xanthates on Flotation Recovery

Challenges and opportunities in the recovery/rejection of trace elements in copper flotation-a review

The effect of regrinding chemistry and particle breakage mechanisms on subsequent cleaner flotation

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