Ultra-fine coal flocculation using dual-polymer systems of ultrasonically conditioned and unmodified flocculant

Lemanowicz, Marcin; Jach, Z.; Kilian, E.; Gierczycki, A.

doi:10.1016/j.cej.2010.12.057

Cited by 39 publications

(6 citation statements)

References 41 publications

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“…3. The similar floc size and strength measurement set-up were used by Lemanowicz et al (2011) previously.…”

Section: Methodsmentioning

confidence: 99%

“…In addition to flocculant type and dosage, Sabah and Cengiz (2004) studied the effect of suspension pH on the flocculation of coal tailings. Lemanowicz et al (2011) investigated the use of ultrasound in dual polymer systems. Ejtemaei et al (2019) used mixtures of surfactants and flocculants to increase the particle settling rate and reducing filter cake moisture.…”

Section: Introductionmentioning

confidence: 99%

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Investigation of flocculation properties and floc structure of coal processing plant tailings in the presence of monovalent and divalent ions

Güngören

Kurşun

Özdemir

2020

Physicochem. Probl. Miner. Process.

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Low-rank coals are generally processed with wet methods including washing, flotation, etc. Fine-sized tailings of these processes are discharged to tailing ponds with a significant amount of associated water which contains a high amount of dissolved ions. These tailings should be dewatered employing coagulation/flocculation in terms of technological and environmental aspects. In this study, the coagulation/flocculation behavior of coal processing plant tailings obtained from Manisa, Turkey was investigated in the presence of monovalent (Na + , K +) and divalent (Mg 2+ , Ca 2+) ions and an anionic flocculant (SPP-600). First, the coagulation properties of coal tailings were determined. Then, the flocculation experiments were carried out, and the turbidity values of the suspensions were measured. Moreover, the sizes of the flocs were determined using a laser diffraction particle size analyzer to analyze the strength of the flocs. The results of the coagulation experiments showed that while divalent ions were more effective at 10-1 mol/dm 3 , higher settling rate and lower turbidity values were obtained in the presence of monovalent ions at 1 mol/dm 3 concentration. The optimum flocculant dosage was obtained as 150 g/Mg from the flocculation experiments. The floc size and strength measurements indicated that the larger flocs were obtained with Na + than Ca 2+ in the presence of the flocculant. The strongest flocs were obtained at 10-1 mol/dm 3 Ca 2+ + 150 g/Mg flocculant. It can be concluded from this study that the coagulation followed by the flocculation method can be employed to obtain fast flocculation behavior and low turbidity for the dewatering of coal tailings.

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“…3. The similar floc size and strength measurement set-up were used by Lemanowicz et al (2011) previously.…”

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Investigation of flocculation properties and floc structure of coal processing plant tailings in the presence of monovalent and divalent ions

Güngören

Kurşun

Özdemir

2020

Physicochem. Probl. Miner. Process.

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“…[4,5] Fortunately, the flocculation method can effectively reduce the turbidity of coal washing wastewater, reduce the risk to the environment and improve the safety of water quality. [6,7] The cationic polyacrylamide (CPAM) exhibits high efficiency for treatment of coal washing wastewater, mainly because negatively charged coal colloidal particles can be neutralized by CPAM, and more compact flocs are formed by adsorption and bridging. In this condition, it can accelerate the flocs sedimentation, reduce the turbidity and SS concentration of coal washing wastewater, and markedly improve the purification effect.…”

Section: Introductionmentioning

confidence: 99%

Study of microwave‐template initiated copolymerization peculiarity and evaluation on the coal floc distinctive behavior and flocculation performance

Chen

Feng

Liu

et al. 2020

J of Applied Polymer Sci

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Cationic polyacrylamide (CPAM) contains a large number of acylamino and positively charged methyl ammonium chloride groups. It has the advantages of good water solubility, strong adsorption bridging ability, enhanced charge neutralization and destabilization performance, excellent flocculation effect, and wide application. Therefore, CPAM can be used in the treatment of coal washing wastewater, and the research and development of a new flocculant with high efficiency is a hot topic in this field. Template copolymer (TPADM) of methacryloyloxyethyl trimethyl ammonium chloride (DMC) and acrylamide (AM) was synthesized by microwave‐template initiated polymerization with sodium polyacrylate (PAAS) as template. The microwave‐template initiated polymerization is abbreviated as MW‐TP. By analyzing FTIR, 1H (13C) NMR and TG/DSC of TPADM, it was found that TPADM had obvious cationic fragment structure. In addition, the association constant (KM) and the kinetics of the template reaction showed that the MW‐TP was confirmed to be free radical initiated polymerization and I Zip‐up (ZIP) polymerization mechanism, which demonstrated the formation of the cationic fragment structure again. This new cationic fragment structure greatly enhanced the ability of charge neutralization, electrical patching and adsorption bridging, thus improving the flocculation performance. Compared with cationic P(AM‐DMC) (CPADM), Commercial cationic polypropanamide (CCPAM‐1 and CCPAM‐2), TPADM had better flocculation effect on coal washing wastewater. Under the optimum flocculation conditions (dosage = 16 mg/L, pH = 7.5), suspended solid (SS) concentration and turbidity of coal washing wastewater treated by TPADM reached 14.3 mg/L and 8.7 NTU, respectively. The floc formation, breakage, and regeneration analyses showed that the cationic fragment structure in TPADM could contribute to the formation of large and high density flocculation structure (d50 ≥ 245 μm, Df ≥ 2.05), and these coal flocs can regenerate rapidly after being broken. Finally, these large and compact flocs help to accelerate the flocs sedimentation and reduce the SS concentration and turbidity of coal washing wastewater, and enhance the effect of solid–liquid separation.

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“…Some large-scale ultrasound equipment has also been used to remove organic matter from dredged silt [19]. For harmless dehydration treatment of dredged silt, a large-scale heating equipment equipped with ultrasonic facility may be designed, as schematically shown in Fig 1. It should be noted that the thermal, cavitation and mechanical effects of the ultrasound itself work differently on various materials [9,[20][21][22]. To investigate the effect of ultrasound on dredged soil drying process, a series of laboratory experiments were carried out in this study.…”

Section: Introductionmentioning

confidence: 99%

Application of ultrasound to enhance the silt drying process: An experimental study

Guo

Gan

2020

PLoS ONE

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Scientific and reasonable treatment of dredged silt can not only protect the ecological environment but also play an essential role in the utilization of silt resources. Due to high water content, low permeability and high organic matter content of the silt, a large amount of bacteria and harmful gases are often produced during the process of silt sedimentation. Thermal drying has been taken as a technically attractive method for harmless treatment of contaminated dredged silt. In this study, ultrasound technology is introduced to shorten the time needed for silt drying. A preliminary laboratory study is carried out to assess the effectiveness of ultrasound on thermal drying. A series of thermal drying tests, with and without ultrasound, were conducted on kaolin soil specimens that were prepared by settling and selfweight consolidation. The test results show that the length of drying time can be shortened by increasing temperature and ultrasound power. The drying time plays a dominant role in the determination of the total energy consumption. This is because reduction of drying time leads to significant decrease in energy consumption for thermal drying, and the energy consumption for additional ultrasound is relatively marginal. For thermal drying at temperatures 60 and 100˚C, when combined with 100 W ultrasound, the length of drying time was shortened by 44.19% and 45.16%, and the energy consumption was saved by 30.07% and 38.16%, respectively; when combined with 60 W ultrasound, the length of drying time was shortened by 4.65% and 6.45%, but the energy consumption was increased by 9.79% and 0.48%, respectively. The combination of thermal drying and 100 W ultrasound is found to be optimal in terms of drying rate and energy consumption for silt drying.

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Ultra-fine coal flocculation using dual-polymer systems of ultrasonically conditioned and unmodified flocculant

Cited by 39 publications

References 41 publications

Investigation of flocculation properties and floc structure of coal processing plant tailings in the presence of monovalent and divalent ions

Investigation of flocculation properties and floc structure of coal processing plant tailings in the presence of monovalent and divalent ions

Study of microwave‐template initiated copolymerization peculiarity and evaluation on the coal floc distinctive behavior and flocculation performance

Application of ultrasound to enhance the silt drying process: An experimental study

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