Effects from changes in pulp nature after ultrasonic conditioning on high-sulfur coal flotation

Kang, Wenze; Xun, Hai-xin; Kong, Xiao-hong; Li, Mingming

doi:10.1016/s1674-5264(09)60093-4

Cited by 20 publications

(22 citation statements)

References 5 publications

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“…They found that the effective separation of chalcopyrite from pyrite was attributed to the desorption of metal hydroxide precipitates, as hydrophilic species, from the surface of the chalcopyrite by ultrasonic treatment. This result can be supported by the conclusion presented by Kang et al [26], who showed a negative effect on the floatability of pyrite during desulfurization in coal flotation with ultrasonication generated by a UGD model multi-function ultrasonic transmitter (20 kHz and 0.2 kW). Table 5 presents the ultimate grades and recoveries acquired in the presence and absence of the ultrasonic bath in the flotation experiments.…”

Section: Effect Of the Ultrasonic Bathsupporting

confidence: 81%

“…Acoustic cavitation in a multi-phase system leads to the generation of submicron (nano)-sized bubbles on particle surfaces, which enhances the particle-bubble contact angle. Sound irradiation may change the pH value, surface tension, and oxidation-reduction potential of flotation pulp with a certain variation in local temperature, dissolved oxygen, conductivity, and pressure [26,27].…”

Section: Introductionmentioning

confidence: 99%

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An Improvement on Selective Separation by Applying Ultrasound to Rougher and Re-Cleaner Stages of Copper Flotation

et al. 2020

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It has been known that the power ultrasound is used as a pretreatment and rarely applied as a simultaneous method to improve grade and recovery during froth flotation processes. This work aimed at investigating the impact of simultaneously used ultrasonic waves under variant operating configurations on the flotation of representative porphyry copper ore during rougher and re-cleaner stages. For this purpose, four different operating outlines were examined as (I) conventional flotation, (II) homogenizer, (III) ultrasonic bath, and (IV) combination of a homogenizer and an ultrasonic bath. The ultrasonic vibration was generated by the homogenizer (21 kHz, 1 kW) in the froth zone and ultrasonic bath (35 kHz, 0.3 kW) in the bulk zone. The rougher and re-cleaner flotation experiments were conducted using Denver-type mechanically agitated cells with 4.2 and 1 L capacities, respectively. The results showed that using the homogenizer (at 0.4 kW) slightly affected the selectivity separation index of chalcopyrite and pyrite, although it positively increased the grade of chalcopyrite from 21.5% to 25.7%. The ultrasonic-assisted flotation experiments with the ultrasonic bath and its combination with the homogenizer (0.4 kW) (i.e., configurations III and IV) led to an increase of approximately 16.1% and 26.9% in the chalcopyrite selectivity index compared to the conventional flotation, respectively. At the cleaning stage, a lower grade of aluminum silicate-based minerals was obtained desirably in every ultrasonic-treated configuration, which was supported with the water recoveries. Finally, applying the homogenizer and its combination with the ultrasonic bath were recommended for re-cleaner and rougher stages, respectively. Further fundamental and practical knowledge gaps required to be studied were highlighted.

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Section: Effect Of the Ultrasonic Bathsupporting

confidence: 81%

Section: Introductionmentioning

confidence: 99%

An Improvement on Selective Separation by Applying Ultrasound to Rougher and Re-Cleaner Stages of Copper Flotation

et al. 2020

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“…When power ultrasound is applied to a liquid in sufficient power, frequency and intensity, the liquid is alternately subjected to compression and expansion forces giving rise to cavitation bubbles [20]. The application of power ultrasound into a liquid containing a mixture of solid particles makes the bubbles collapse near a solid surface, a high-speed jet of liquid is driven into the particles, and this jet can deposit enormous energy densities at the site of impact [21].…”

Section: Introductionmentioning

confidence: 99%

Further Investigations on Simultaneous Ultrasonic Coal Flotation

Özkan

2017

Minerals

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This study investigates the flotation performance of a representative hard coal slime sample (d 80 particle size of minus 0.2 mm) obtained from the Prosper-Haniel coal preparation plant located in Bottrop, Germany. Flotation was carried out with a newly designed flotation cell refurbished from an old ultrasonic cleaning bath (2.5 L volume) equipped with a single frequency (35 kHz) and two different power levels (80-160 W) and a sub-aeration-type flotation machine operating at a stable impeller speed (1200 rpm) and air rate (2.5 L/min). The reagent combination for conventional and simultaneous ultrasonic coal flotation tests was Ekofol-440 at variable dosages (40-300 g/t) with controlling water temperature (20-25 • C) at natural pH (6.5-7.0). The batch coal flotation results were analyzed by comparing the combustible recovery (%) and separation efficiency (%) values, taking mass yield and ash concentrations of the froths and tailings into account. It was found that simultaneous ultrasonic coal flotation increased yield and recovery values of the floated products with lower ash values than the conventional flotation despite using similar reagent dosages. Furthermore, particle size distribution of the ultrasonically treated and untreated coals was measured. Finely distributed coal particles seemed to be agglomerated during the ultrasonic treatment, while ash-forming slimes were removed by hydrodynamic cavitation.

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“…This is most probably due to the progressive removal of the secondary particles or oxide layers from the particle surfaces by the ultrasonic application leading to a better collector adsorption. This observation is in line with the previous studies where the ultrasonic application was found to result in higher recoveries at better selectivity when applied before and during flotation (Aldrich and Feng, 1999;Celik et al, 2002;Ozkan., 2006;Ozkan and Kuyumcu., 2006;Cilek and Ozgen, 2009;Kang et al;Ozkan et al, 2012;Gungoren et al, 2017;Cao et al, 2017;Ghadyani et al, 2018;Ozun et al, 2019;Gungoren et al, 2019;Chen et al, 2020). When the ultrasonic application was applied to the floated particles followed by the re-flotation of these particles, the flotation behavior of the two minerals separated very sharply.…”

Section: Effect Of Ultrasonic Application For Separate Pyrite and Galmentioning

confidence: 99%

“…In the mineral pulp, this phenomenon forms liquid jets with the speeds in the order of 100 m/sec. These jets can remove surface coatings from minerals, and even eliminate oxidation (Kang et al, 2009, Cao et al, 2017. Therefore, the use of the ultrasonic application has been investigated by several studies for improving flotation efficiency before flotation (Aldrich and Feng, 1999;Celik et al, 2002) or during flotation (Ozkan and Kuyumcu, 2006, Cilek and Ozgen, 2009, Ozkan et al, 2012Gungoren et al 2017;Ghadyani et al, 2018;Ozun et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

Investigating the effects of ultrasonic energy on the flotation behavior of pyrite and galena minerals

Horasan¹,

Tanriverdi²,

Çiçek³

et al. 2020

Physicochem. Probl. Miner. Process.

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Although pyrite is one of the more abundant minerals of the earth crust, it has low economic value. When it reports to the concentrate during flotation along with the valuable minerals, it decreases the grade of the valuable minerals and leads to an increase in smelting costs. Numerous modifications have been suggested in the literature to increase the selective recovery of pyrite containing base metalsulfide ores. The use of ultrasonic applications is one such method. In this study, the effect of the ultrasonic application on the flotation behavior of galena and pyrite mineral was investigated through systematic Hallimond Tube experiments. In the initial phase of the experiments, the optimum flotation conditions (particle size, pH, amount of air, and amount of reagent) were determined for the two minerals. Subsequent experiments were carried out under these optimums to distinguish the effect of the ultrasonic application. The influence of how the ultrasonic application was applied (i.e. before and during the conditioning stage or before the re-flotation of the concentrate) was also studied. It was observed that the ultrasonic application had a strong activating influence if it was administered before or during the conditioning stage. The effect was similar to whether the minerals were floated individually or from their mixtures. However, when it was applied to a flotation concentrate before reflotation, it selectively displayed a depressant action for the pyrite to the extent that no depressants were needed. The results conclusively showed that the ultrasonic application could drastically improve the selectivity of the complex ores.

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Effects from changes in pulp nature after ultrasonic conditioning on high-sulfur coal flotation

Cited by 20 publications

References 5 publications

An Improvement on Selective Separation by Applying Ultrasound to Rougher and Re-Cleaner Stages of Copper Flotation

An Improvement on Selective Separation by Applying Ultrasound to Rougher and Re-Cleaner Stages of Copper Flotation

Further Investigations on Simultaneous Ultrasonic Coal Flotation

Investigating the effects of ultrasonic energy on the flotation behavior of pyrite and galena minerals

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