Slime coatings in froth flotation: A review

Yu, Yuexian; Ma, Liqiang; Cao, Mingcui; Liu, Qingxia

doi:10.1016/j.mineng.2017.09.002

Cited by 164 publications

(58 citation statements)

References 90 publications

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“…It is a hydrophobic clay mineral that can be easily entrained into froth layers, thus lowering the concentrate grade [13,14]. Moreover, clinochlore could attach on cassiterite surfaces as "slime coating", which has detrimental effect on the recovery of cassiterite in direct flotation even with an efficient collector [11,15,16]. Therefore, the separation of clinochlore from cassiterite is difficult to achieve in direct flotation due to the hydrophobic property of clinochlore surface.…”

Section: Introductionmentioning

confidence: 99%

Effect of Al (III) Ions on the Separation of Cassiterite and Clinochlore Through Reverse Flotation

et al. 2018

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Most hydrophobic clay minerals, such as clinochlore, are known to cause problems in the recovery of cassiterite. In this study, a new reagent scheme, i.e., sodium oleate (NaOL) as a collector and Al (III) ions as a depressant, for reverse flotation separation of cassiterite and clinochlore was investigated. The flotation performance and interaction mechanism were studied by microflotation tests, adsorption tests, contact angle measurements, and X-ray photoelectron spectroscopy (XPS) analysis. Results of single mineral flotation experiments showed that NaOL had a different flotation performance on cassiterite and clinochlore, and the addition of Al (III) ions could selectively inhibit the floatability of cassiterite. Reverse flotation tests performed on mixed minerals indicated that the separation of cassiterite and clinochlore could be achieved in the presence of NaOL and Al (III) ions. Adsorption experiments demonstrated that Al (III) ions hindered the adsorption of NaOL on cassiterite surfaces but exerted little influence on the adsorption of NaOL on clinochlore surfaces. Results of contact angle measurements indicated that Al (III) ions could impede the hydrophobization process of cassiterite in NaOL solution. XPS results showed that aluminum species were adsorbed onto the cassiterite surfaces through the interaction with O sites.

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Section: Introductionmentioning

confidence: 99%

Effect of Al (III) Ions on the Separation of Cassiterite and Clinochlore Through Reverse Flotation

et al. 2018

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“…With pH 10, the highest recovery was obtained. The metal recovery of tailings was not very high; the possible reason could be that the mechanical entrainment, which leads to transport of gangue material with mineral particles increases with increase in percentage of fine particles [62]. It is more likely to operate on fine particles, which are prone to be carried over in liquid due to relatively low mass (refer to Figure 6 for entrainment explanation).…”

Section: Flotationmentioning

confidence: 99%

Assessment of the Possible Reuse of Extractive Waste Coming from Abandoned Mine Sites: Case Study in Gorno, Italy

Mehta

Dino

Passarella³

et al. 2020

Sustainability

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Supply of resources, a growing population, and environmental pollution are some of the main challenges facing the contemporary world. The rapid development of mining activities has produced huge amounts of waste. This waste, found in abandoned mine sites, provides the potential opportunity of extracting raw material. The current study, therefore, focuses on testing the validation of a shared methodology to recover extractive waste from abandoned mines, and applies this methodology to a case study in Gorno, northwest Italy. The methods focused on: (1) analyzing the impact of tailings and fine fraction of waste rock (<2 mm) on plants (Cress -Lepidium Sativum) to assess usability of both as soil additive, and (2) recovering raw materials from tailings and coarse fraction (>2 mm) of waste rock, by means of dressing methods like wet shaking table and froth flotation. The results indicated that the fine fraction of waste rock and tailings did not have detrimental effects on seed germination; however, there was marked decrease in plant growth. As for the recovery of raw materials, the coarse waste rock samples, crushed to <0.5 mm, produced a recovery of Cd, Ga, and Zn-as much as 66%, 56%, and 64%, respectively-using the wet shaking table. The same samples when crushed to 0.063-0.16 mm and used for froth flotation produced a recovery of Cd, Ga, and Zn of up to 61%, 72%, and 47%, respectively. The flotation experiment on tailings showed a recovery of Cd, Ga and Zn at pH 7 of 33%, 6% and 29% respectively. The present investigation highlights the methodologies used for extracting raw materials from extractive waste.

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“…Thus, it can be deduced that the slight decrease of pyrite recovery was caused by the adsorption of aluminum hydroxyl onto pyrite surfaces, which decreased the hydrophobicity of pyrite [25,26]. In contrast, the flotation recovery of pyrite was rather low, with a value of about 14% in the presence of serpentine at pH 9, which shows that fine serpentine had an adverse influence on pyrite flotation due to the serpentine slime coatings [13]. Interestingly, the flotation recovery of pyrite was significantly improved with the addition of KAl(SO 4 ) 2 ·12H 2 O, and a maximum increasement Figure 4 shows the flotation recovery of pyrite under different conditions as a function of the pulp pH.…”

Section: Flotationmentioning

confidence: 99%

“…However, in practice, the results are not so satisfactory due to the high dosage and the lack of selectivity of the dispersant. In addition, physical methods such as ultrasonic treatment and high-intensity conditioning have been usually employed to remove the slime coatings from valuable mineral surfaces [11][12][13]. However, it appears that ultrasonic treatment and high-intensity conditioning are not efficiently economical methods.…”

Section: Introductionmentioning

confidence: 99%

A Novel Method to Limit the Adverse Effect of Fine Serpentine on the Flotation of Pyrite

et al. 2018

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A novel method to limit the adverse effect of fine serpentine on the flotation of pyrite was investigated in this paper. The flotation results showed that coarser serpentine possessed a weaker depression effect on the pyrite flotation process, and the use of KAl(SO 4 ) 2 ·12H 2 O could efficiently limit the detrimental effect of fine serpentine on pyrite with a maximum increase of pyrite recovery from 14% to 86% at pH 9.0. The results of particle size measurements and rheological measurements exhibited that the addition of KAl(SO 4 ) 2 ·12H 2 O increased the particle size of serpentine buta hrdly affected the particle size of pyrite, then limited the formation of serpentine-pyrite aggregates. Adsorption test results showed that the adsorption density of potassium butyl xanthate (PBX) onto pyrite regained with the addition of KAl(SO 4 ) 2 ·12H 2 O, thereby achieving good flotation improvement. It can be concluded that KAl(SO 4 ) 2 ·12H 2 O is likely to be an effective pyrite flotation reagent, especially in the presence of fine serpentine.Aluminum potassium sulfate dodecahydrate (KAl(SO 4 ) 2 ·12H 2 O), which is commonly known as potassium alum, has been most commonly used as an inorganic coagulant for decades due to its characteristics of nontoxicity, cheapness, and wide sources [15,16]. KAl(SO 4 ) 2 ·12H 2 O hydrolyzes to form an amorphous floc of Al(OH) 3 (s) to coagulate small particles into large flocs by its high adsorption affinity in aqueous solution [17,18]. However, the utilization of KAl(SO 4 ) 2 ·12H 2 O to remove the depressant of fine serpentine on the flotation of sulphide minerals has not been studied previously, and thus it was chosen as a potential coagulant in removing slime coatings of fine serpentine from sulphide minerals in this study. Pyrite is the most widespread and abundant of naturally occurring metal sulphides, and is always associated with magnesium silicate minerals [19,20]. Therefore, it was chosen as the valuable mineral in this paper. The effect of KAl(SO 4 ) 2 ·12H 2 O on the flotation process was evaluated through single mineral flotation, particle size measurements, rheology measurements, and adsorption measurements. Materials and Methods Samples and ReagentsThe serpentine and pyrite minerals used for all the experiments were obtained from Donghai, Jiangsu Province, and Yunfu, Guangdong Province of China, respectively. Serpentine and pyrite samples were crushed to −1 mm in a laboratory roll crusher and grounded using an agate mortar and pestle to the designed fraction. Here, −150 + 74 µm, −74 + 38 µm, and −10 µm serpentine and −150 + 74 µm pyrite particles were used for the flotation tests; the −10 µm serpentine and −150 + 74 µm pyrite particles were used for particle size measurements and rheology measurements; and the −10 µm serpentine and −38 µm pyrite particles were used for the adsorption measurements. According to the results of X-ray diffraction (XRD), shown in Figure 1, the serpentine sample constituted 98% serpentine and 2% chlorite, and the purity of pyrite was higher...

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Slime coatings in froth flotation: A review

Cited by 164 publications

References 90 publications

Effect of Al (III) Ions on the Separation of Cassiterite and Clinochlore Through Reverse Flotation

Effect of Al (III) Ions on the Separation of Cassiterite and Clinochlore Through Reverse Flotation

Assessment of the Possible Reuse of Extractive Waste Coming from Abandoned Mine Sites: Case Study in Gorno, Italy

A Novel Method to Limit the Adverse Effect of Fine Serpentine on the Flotation of Pyrite

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