Preparation of polymeric aluminum ferric chloride (PAFC) coagulant from fly ash for the treatment of coal-washing wastewater

Liang, Yan; Wang, Yufei; Jian, Li; Shen, Huidong; Zhang, Chao; Qu, Tiantian

doi:10.1080/19443994.2015.1089420

Cited by 18 publications

(14 citation statements)

References 32 publications

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“…However, aluminum is suspected to be harmful to humans and other living organisms, and ferric coagulants need a large amount of alkali to resist the pH depression that occurs during coagulation . In recent years, the number of reports on polymeric aluminum ferric chloride (PAFC) as an efficient inorganic polymer coagulant have increased . PAFC, which combines with the advantages of both poly(aluminum chloride) and poly(ferric chloride), has the characteristics not only of aluminum salt coagulants but also of iron salt coagulants.…”

Section: Introductionmentioning

confidence: 99%

Preparation and coagulation performance of hybrid coagulant polyacrylamide–polymeric aluminum ferric chloride

Wang

Jiang

Tan

et al. 2018

J of Applied Polymer Sci

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In this study, we synthesized a novel hybrid coagulant, polyacrylamide (PAM)-polymeric aluminum ferric chloride (PAFC), by the polymerization of acrylamide monomer with the redox system (NH 4 ) 2 S 2 O 8 -NaHSO 3 . The factors affecting the PAM-PAFC hybrid coagulant were investigated in an orthogonal experiment. The maximum intrinsic viscosity was observed at an initiator mass fraction of 0.5%, a polymerization temperature of 50 8C, a monomer mass fraction of 20%, and a polymerization time of 4 h, which were the optimum synthesis parameters. The spatial network structure of the PAM-PAFC hybrid coagulant was graphically determined by scanning electron microscopy. Hybrid PAM-PAFC was adopted to treat the kaolin-humic acid suspension and the synthetic dye wastewater. The effect of the coagulant dosage and pH on the coagulant experiments were examined. The coagulant experiment on the kaolin-humic acid suspension showed that the optimum treatment efficiency was achieved at a coagulants dosage of 0.6 mg/L, at which level the turbidity reductions with the inorganic PAFC coagulant, PAM-PAFC composite, and PAM-PAFC hybrid were 95.30%, 95.84%, and 98.38%, respectively. Treatment with the PAM-PAFC hybrid coagulant was also effective in removing Congo Red and Direct Fast Turquoise Blue GL; the color-removal efficiencies for these dyes were higher than 93% and 94%, respectively.

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Section: Introductionmentioning

confidence: 99%

Preparation and coagulation performance of hybrid coagulant polyacrylamide–polymeric aluminum ferric chloride

Wang

Jiang

Tan

et al. 2018

J of Applied Polymer Sci

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“…pH plays an indispensable role in the preparation of PAFC. A low pH is not conducive to hydrolysis and polymerization, while a high pH easily causes a large amount of hydroxide sol and precipitation (Yan et al 2016). Therefore, the in uence of different pH on the COD removal e ciency of land ll leachate was explored.…”

Section: Optimization Of Preparation Parametersmentioning

confidence: 99%

“…The charges and molecular chains carried by PAFC increase continuously, which improved the charge neutralization and adsorption bridging of PAFC during the occulation process. Hence, the occulation performance was optimized with the increasing T (Yan et al 2016).…”

Section: Optimization Of Preparation Parametersmentioning

confidence: 99%

“…Typically, inorganic polyaluminum iron chloride (PAFC) occulant was generally used in industry. Moreover, some research indicates that there is little residual Al and Fe in the aquatic solution after treatment (Yan et al 2016). Whereas, how to reduce the production cost of PAFC through substituting synthetic raw materials, how to further strengthen its treatment e ciency via the optimization of occulation conditions, and how to improve the quality of PAFC are scienti c problems that urgently need to be solved in the application of PAFC.…”

Section: Introductionmentioning

confidence: 99%

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Red Mud-Based Polyaluminum Ferric Chloride Flocculant: Preparation, Characterization and Flocculation Performance

Cheng

Liu

et al. 2021

Preprint

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In this work, red mud was used as raw material to extract Al and Fe with hydrochloric acid. The high-efficiency polyaluminum iron chloride (PAFC) flocculant was prepared via adjusting the pH of the leaching solution, the molar ratio of aluminum and iron, and the polymerization temperature. The effect of synthesis and flocculation conditions on the flocculation performance of aged landfill leachate was investigated. The results confirmed that the PAFC prepared at the polymerization pH of 2.5, the Al/Fe molar ratio of 8, and the polymerization temperature of 70 °C had the optimum flocculation effect. The flocculation consequences of PAFC and commercial polyaluminum iron chloride flocculant (CPAFC) under different flocculation conditions were compared. The chemical oxygen demand (COD), UV254, chroma and settlement height of PAFC at flocculant concentration of 60 g/L and solution pH of 6 were 72.2%, 79.2%, 82.9% and 9.5 cm (within 90 min), respectively. PAFC has excellent flocculation performance and can be used as a simple, potentially low-cost wastewater treatment agent in industrial applications.

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“…The Omsk CFA mainly contains 20-35 wt % alumina, 50-65 wt % silica, 5-15 wt % magnetite, and up to 6 wt % unburned carbon [1,2]. Previous research was aimed mainly at studying methods for producing alumina [3][4][5][6], ceramics [7][8][9][10], coagulants [11,12], and the extraction of the rare-earth elements [13][14][15][16][17]. Our previous research was about the leaching of alumosilicates with hydrochloric acid…”

Section: Introductionmentioning

confidence: 99%

Magnetite and Carbon Extraction from Coal Fly Ash Using Magnetic Separation and Flotation Methods

et al. 2019

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In this study, enrichment methods for coal fly ash (CFA) from Omsk thermal power station No. 4 (TPS-4) were investigated. The magnetite and unburned carbon concentrates were obtained by magnetic separation and flotation methods. The wet magnetic separation used in the study increased the magnetite content in the magnetic fraction from 10.48 to 12.72 wt % compared to dry magnetic separation. The XRD analysis showed that the magnetic fraction primarily consists of magnetite, mullite, and quartz. The SEM analysis demonstrated that magnetite is located primarily on the surface of alumosilicate spheres and has three types of shape: dendritic structures, hexagonal bulk agglomerates, and star-like structures. For the flotation tests, a low-price diesel was used as the collector. It was found that, if CFA particles of 40–71 µm are used, ~99% of unburned carbon can be recovered. It was also found by SEM that, if CFA particles of 71–100 µm are used, alumosilicates on a carbon surface prevent complete interaction of diesel with carbon particles and decrease thereby carbon recovery to 83%.

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Preparation of polymeric aluminum ferric chloride (PAFC) coagulant from fly ash for the treatment of coal-washing wastewater

Cited by 18 publications

References 32 publications

Preparation and coagulation performance of hybrid coagulant polyacrylamide–polymeric aluminum ferric chloride

Preparation and coagulation performance of hybrid coagulant polyacrylamide–polymeric aluminum ferric chloride

Red Mud-Based Polyaluminum Ferric Chloride Flocculant: Preparation, Characterization and Flocculation Performance

Magnetite and Carbon Extraction from Coal Fly Ash Using Magnetic Separation and Flotation Methods

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