FTIR study of thionocarbamate adsorption on sulfide minerals

Leppinen, Jaakko; Basilio, C.I.; Yoon, Roe‐Hoan

doi:10.1016/0166-6622(88)80008-8

Cited by 50 publications

(31 citation statements)

References 6 publications

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“…through both the C=O and C=S groups. The present infrared study is supported by the findings of others [15][16][17][18]. In addition, the present infrared evidence suggests that the interaction between the oxygen-to-copper bond is stronger than the sulfur-to-copper bond in agreement with literature reports [15,19].…”

Section: Infrared Spectroscopic Analysissupporting

confidence: 95%

Synthesis and reaction with metal ions of a new thionocarbamate

Zhong

2011

Res Chem Intermed

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The synthesis and research of a novel thionocarbamate N,N 0 -diethoxycarbonyl-O,O 0 -(1,4-butylidene) dithionocarbamate which contains two ester and two thioamide groups are reported. This compound was characterized by elemental analysis, UV spectrum, infrared spectrum, mass spectrum, and 1 H NMR and 13 C NMR spectroscopy. Additionally, the metal ion-collector interaction in organic solution was put into practice. The results of UV spectroscopic analysis showed that this dithionocarbamate with a new structure exhibited a stronger complex ability with Cu 2? than with Ni 2? or Fe 3? . Furthermore, infrared spectroscopic analysis implicated that this dithionocarbamate binds to Cu 2? through both the C=O and C=S groups. Bench-scale flotation tests were also carried out, verifying that it has a higher copper flotation recovery and better selectivity to sulfide ores containing Cu compared with universal collectors.

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Section: Infrared Spectroscopic Analysissupporting

confidence: 95%

Synthesis and reaction with metal ions of a new thionocarbamate

Zhong

2011

Res Chem Intermed

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“…Leppinen er a1. 6 used ATR spectroscopy to study ethyl xanthate adsorption on finely ground sulphide mineral powders under controlled potential.…”

Section: Introductionmentioning

confidence: 99%

In situ FTIR study of ethyl xanthate adsorption on gold, silver and copper electrodes under controlled potential

Talonen¹,

Rastas²,

Leppinen

1991

Surface & Interface Analysis

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The applicability of a spectroelectrochemical metbod to the problems related to flotation was studied. The object of the study was to investigate the adsorption of ethyl xanthate on gold, silver and copper surfaces. Spectra were obtained using subtractively normalized interfacial Fourier tramform infrared spectrowopy, which allows potential control of the electrode while recording an infrared spectrom at the electrode surface. For each metal, a good correlation exists between the spectral intensities of the product of the surface reaction and the voltammogram of the metal electrode immersed in xanthate solution. On gold, xanthate is oxidized to dixanthogen, which is then adsorbed onto the gold surface. In the case of both silver and copper, xanthate reacts with the surface in two separate steps. The first comprises chemisorption of xanthte, the result beiig a monolayer of metal xanthate-like surface compound. The second, more anodic, step is the formation of multilayers of metal xanthte.

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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: 89%

“…Smart (1991) indicated that the hydrophilic oxidation species may be removed by the addition of a large amount of xanthate collectors. However, Leppinen et al (1988) reported that thionocarbamate collectors were not capable of removing the oxidation species from pyrite surface even with a high dosage. Therefore, pyrite depression by the oxidising condition is more pronounced when using thionocarbamate collector in this study.…”

Section: Pre-aeration Before Cleaner Flotationmentioning

confidence: 99%

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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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FTIR study of thionocarbamate adsorption on sulfide minerals

Cited by 50 publications

References 6 publications

Synthesis and reaction with metal ions of a new thionocarbamate

Synthesis and reaction with metal ions of a new thionocarbamate

In situ FTIR study of ethyl xanthate adsorption on gold, silver and copper electrodes under controlled potential

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

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