Flocculation of Both Kaolin and Hematite Suspensions Using the Starch-Based Flocculants and Their Floc Properties

Haijiang, LI; Cai, Tao; Yuan, Bo; Li, Ruihua; Yang, Hu; Li, Aimin

doi:10.1021/ie503606y

Cited by 62 publications

(23 citation statements)

References 48 publications

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“…Several studies have shown that naturally occurring coagulants/flocculants can be used for the treatment of effluents and drinking water [5,12,16]. ese natural coagulants/flocculants, in contrast to synthetic ones, are more accessible and nontoxic [17,18]. All those advantages justify the actual rising interest for natural coagulants [12,13,19].…”

Section: Introductionmentioning

confidence: 99%

Coagulation and Sedimentation of Concentrated Laterite Suspensions: Comparison of Hydrolyzing Salts in Presence of Grewia spp. Biopolymer

Bernard

Sylvere

Patrice

et al. 2019

Journal of Chemistry

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Coagulation and sedimentation performances of aluminum sulphate and ferric chloride were comparatively investigated in presence of Grewia spp. biopolymer for the treatment of concentrated laterite suspensions. Jar tests experiments were carried out at different laterite suspension concentrations (10, 20, and 30 g/L) and pH values (5 and 7). The performances of these coagulants were assessed in terms of interfacial settling velocities and sediment concentration factors. Results showed that after addition of Grewia spp. biopolymer, sedimentation velocities were greater when ferric chloride and aluminum sulphate were used alone. When hydrolyzing salts were used alone, the highest settling velocities were obtained with 10 g/L of laterite suspension at pH 5 and settling speeds were 0.22 and 0.28 cm/min for aluminum sulphate and ferric chloride, correspondingly. Addition of Grewia spp. biopolymer led to an increase of settling velocities to 0.56 and 0.57 cm/min, respectively. The sediment concentration factor was also found to be high when Grewia spp. was added. With 30 g/L of laterite suspension, sediment concentration factors at pH 5 were 1.47 and 2.12 for aluminum sulphate and ferric chloride separately. Addition of Grewia spp. biopolymer with aluminum sulphate and ferric chloride produced more compact sludge with sediment concentration factors of 4 and 3.13, respectively. Flocs structures could successfully explain the obtained results.

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Section: Introductionmentioning

confidence: 99%

Coagulation and Sedimentation of Concentrated Laterite Suspensions: Comparison of Hydrolyzing Salts in Presence of Grewia spp. Biopolymer

Bernard

Sylvere

Patrice

et al. 2019

Journal of Chemistry

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“…In a study of the effectiveness for two types of starch-based flocculants by Haijiang Li et al (2015), suspensions of hematite and kaolin, whose charge is opposite to that of flocculants, were used. Based on the change in ζ-potential of the particles was found to be the main mechanism of clarification in this case was the neutralization of particle's charge.…”

Section: Fig 2 Curves Of the Percentage Deposition Of Suspended Parmentioning

confidence: 99%

Justification of the Choice of Flocculants for Wastewater Treatment After Magnetic Separation of Iron Ores

Patyuk¹,

Kulishenko²,

Клименко³

2019

WPT STN

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Wet magnetic separation is the most common operation in the enrichment of oxidized iron ores (Karmazin 2005, Kirnarsky 2017, Oleynik 2014). Wastewater discharged after separation is a polydisperse suspension with different physicochemical nature of the components. The particle sizes of the suspension are in the range from 3 to less than 0.005 mm, the mass yield of the smallest fraction is from 60 to 90%. The solid phase contains at least 60% silicon oxide, more than 14% iron compounds and 1,8-3,0% dust and clay particles. After reagentless sedimentation in sludge collectors, partially clarified wastewater is sent to the recycled water pools and after additional sedimentation is reused in production. In ensuring the quality of iron ore concentrates, special attention is paid to the preparation of raw materials, while the influence of the quality of recycled water is practically not considered. However, the recycled water used in the enrichment process contains a large number of fine particles, more than 80% of which have a size of less than 74 microns (Chen et al. 2017 and Jiwei Bian et al. 2018). Reagentless sedimentation method does not satisfy modern requirements due to low-speed deposition sedimentation stable suspensions of fine particle size up to 10-6-10-7 m. The complexity of enrichment for weakly magnetic iron ores is associated with their sludgingfixing of thin (less than 0.5 microns) particles on the surface of ore and non-metallic minerals (Gubin et al. 2016). As a rule, particles of quartz and clay impurities are fixed on ore particles. On non-ore particles are fixed iron hydroxide, hematite, magnetite, siderite and other iron-containing minerals. The process of adhesion of suspensions is intensified at wet enrichment in a strong magnetic field with an induction of 0.6-1.4 T. There is a decrease in the specific magnetic susceptibility of the ore phase and its increase for the non-ore one. Ravinskaya (2019) proposes to process iron ore pulp with ultrasound to eliminate the negative impact of adhering silicate's fine particles with a size of 0.001-0.005 mm. It is noted that the purification of ore and non-ore particles from adhering sludge allows to increase the yield of commercial concentrate by 2.37-4.0% and to increase the extraction of total iron into the concentrate by 3.25-3.45%. Thus, the high concentration of suspended solids of the source rock remaining in the recycled water makes it difficult to reuse it during enrichment. Therefore, it is advisable to increase the deposition rate of fine particles by adding flocculants to the water, which are widely used in such cases (Spehar et al. 2015, Van Deventer et al. 2011 and Artemiev 2017). With increasing particle deposition rate, the frequency of water turnover cycles increases, which creates favorable economic conditions for existing industries and is of considerable interest for the design of local high-speed thickeners and settling tanks, since it allows to abandon bulky sludge collectors and settling ponds that cause significant harm to the env...

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“…Large numbers of cationic flocculants have been utilized for flocculation of kaolin. Li et al . have used starch‐based cationic polymer for kaolin flocculation.…”

Section: Introductionmentioning

confidence: 99%

Flocculation of kaolin from aqueous suspension using low dosages of acrylamide‐based cationic flocculants

Suresha

Badiger

2018

J of Applied Polymer Sci

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Flocculation of kaolin from aqueous streams has become very important in view of its wide range of applications. In this work, cationic flocculants based on copolymers of acrylamide (AM) and 3‐acrylamidopropyltrimethylammonium chloride (APTMAC) were synthesized with two different mole ratios of monomers, 80 mol % of AM (CP‐8020) and 40 mol % of AM (CP‐4060). The chemical structures of copolymers were confirmed by 1H and carbon‐13 nuclear magnetic resonance (13C NMR) spectroscopy. The molecular weight (MW) and zeta potential of the copolymers were determined. High MW was obtained for copolymer with high content of AM (CP‐8020) and high zeta potential was observed for copolymer with high content of APTMAC (CP‐4060). Flocculation of kaolin suspension was performed using both CP‐8020 and CP‐4060 and the flocculation was correlated to the zeta potential and MW of the copolymers. The optimum dosages of flocculants were determined. The mechanism of flocculation was discussed in terms of charge neutralization and bridging. The flocs of kaolin were characterized in terms of moisture content and size. To the best of our knowledge, this copolymer system was used for the first time for kaolin flocculation and found out to be efficient. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 47286.

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Flocculation of Both Kaolin and Hematite Suspensions Using the Starch-Based Flocculants and Their Floc Properties

Cited by 62 publications

References 48 publications

Coagulation and Sedimentation of Concentrated Laterite Suspensions: Comparison of Hydrolyzing Salts in Presence of Grewia spp. Biopolymer

Coagulation and Sedimentation of Concentrated Laterite Suspensions: Comparison of Hydrolyzing Salts in Presence of Grewia spp. Biopolymer

Justification of the Choice of Flocculants for Wastewater Treatment After Magnetic Separation of Iron Ores

Flocculation of kaolin from aqueous suspension using low dosages of acrylamide‐based cationic flocculants

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