Flocculation performance of anionic starch in oil sand tailings

Zhao, Nana; Bitar, H.; Zhu, Yunyin; Xu, Yuming; Shi, Zhiqing

doi:10.2166/wst.2018.405

Cited by 4 publications

(3 citation statements)

References 18 publications

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“…Na-CMS is a polymer produced on an industrial scale and is used in oil and gas [6,7], textile [8,9,10], pharmaceutical [11,12] industries, is used as a stabilizer for aqueous solutions, suspensions and emulsions, occulants, adhesive etc. [13,14,15]. In addition, aqueous solutions of Na-CMS are more stable and less prone to biodegradation compared to starch [16].…”

Section: Introductionmentioning

confidence: 99%

Investigation of the physicochemical properties of aqueous solutions of sodium salt of carboxymethyl starch obtained in the solid phase by viscometric methods

Saparov,

Makhkamov

2023

Preprint

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By chemical modification of corn starch with sodium monochloroacetate in the solid phase, samples of sodium salt of carboxymethyl starch (Na-CMS) with different degrees of substitution (DS) were synthesized. In the synthesis of Na-CMS, solvents such as water, methanol, ethanol, butanol, and isopropyl alcohol were used as humectants in the reaction mixture. The viscosity of dilute aqueous solutions of Na-CMS was studied by capillary viscometry. It is shown that dilute solutions of Na-CMS exhibit properties characteristic of polyelectrolytes. The rheological properties of aqueous solutions of the synthesized Na-CMS samples were studied by the method of rotational viscometry. By changing the shear rate gradient over a wide range, the values of the shear stress and the effective viscosity of the solutions at different temperatures were determined. At the same time, the obtained data showed that aqueous solutions of Na-CMS belong to non-Newtonian liquids in the entire studied temperature range. It was also found that the dynamic viscosity of Na-CMS solutions decreases with an increase in their DS. The activation energy of the viscous flow of Na-CMS solutions was determined, the value of which shows that the polymer macromolecules interact with each other through hydrogen bonds.

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Section: Introductionmentioning

confidence: 99%

Investigation of the physicochemical properties of aqueous solutions of sodium salt of carboxymethyl starch obtained in the solid phase by viscometric methods

Saparov,

Makhkamov

2023

Preprint

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“…de Oliveira et al reported that chitosan, a cationic natural polysaccharide, modified with 3-chloro-2-hydroxypropyltrimethylammonium chloride, may be successfully used to treat oil sands MFT . Zhao et al reported that carboxymethylated starch (anionic starch) is also capable of dewatering oil sands tailings …”

Section: Introductionmentioning

confidence: 99%

“…16 Zhao et al reported that carboxymethylated starch (anionic starch) is also capable of dewatering oil sands tailings. 17 Very recently, we described the preparation of thermoresponsive starch nanoparticles (SNPs) by treating SNPs with butene oxide. 18 The resulting hydroxybutylated SNPs exhibited thermoresponsivity when the molar substitution (MS) was greater than 1.…”

Section: Introductionmentioning

confidence: 99%

Thermoresponsive Starch for the Flocculation of Oil Sands Mature Fine Tailings

Zheng

Taylor

2020

Environ. Sci. Technol.

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The reclamation of land and recovery of water from tailing ponds created during bitumen extraction from oil sands is a major technical and environmental challenge. In the current study, thermoresponsive hydroxybutylated (HB) corn starch (HB-CS) and potato starch (HB-PS), with lower critical solution temperatures (LCSTs) ranging from 36 to 45 °C, were examined as flocculants for oil sands mature fine tailings (MFT). The ability of different doses of the HB-CS and HB-PS to flocculate 2 and 10 wt % MFT, prepared by diluting 35 wt % MFT in tap water, in terms of the initial settling rate (ISR), supernatant turbidity (ST), sediment solids content (SSC), and water recovery (WR), was examined at temperatures below and above their LCSTs. The thermoresponsive HB-CS and HB-PS were good flocculants of MFT, and their thermoresponsive behavior was essential for optimal results in that they were considerably more effective in several aspects at temperatures above their LCSTs than below. In terms of ISRs, the HB-PS was a considerably better flocculant than the HB-CS, and this was especially so with the 10 wt % MFT. With the HB-PS, the ISR was lower when using diluted MFT prepared with tap water as opposed to simulated oil sands process water.

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Polymeric flocculation of oil sands tailings: Unveiling rheological indicators and dynamics of bitumen release

Sasar,

Johnston,

Santagata

2024

Can J Chem Eng

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Polymeric flocculation is widely used to accelerate the dewatering and consolidation of oil sands fluid fine tailings (FFTs). Optimizing flocculation requires a fundamental understanding of the changes to the internal structure of the material with polymer addition. Key challenges include sensitivity of flocculation to polymer dose, mixing conditions, and composition of individual FFTs. Moreover, despite the environmental implications, little is known of the effects of flocculation on the mobility of the residual organics present in the tailings. In this paper, advanced rheological tests are used to probe the formation and development of the polymer–clay structure during flocculation in near‐real time. This is achieved through a novel setup for controlled delivery of the polymer directly into the measuring cell of a rheometer. This enables continuous monitoring of the rheological parameters during the flocculation process and yields consistent and reproducible samples. An optical monitoring system is used to relate rheological measurements to water release and to changes in the surface accumulation of the residual bitumen. The water‐release polymer dose is found to be associated with a distinct rheological response highlighting the potential use of rheometry for polymer dosing/mixing optimization in real time and on a continuous basis in thickeners and inline flocculation systems.

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Flocculation performance of anionic starch in oil sand tailings

Cited by 4 publications

References 18 publications

Investigation of the physicochemical properties of aqueous solutions of sodium salt of carboxymethyl starch obtained in the solid phase by viscometric methods

Investigation of the physicochemical properties of aqueous solutions of sodium salt of carboxymethyl starch obtained in the solid phase by viscometric methods

Thermoresponsive Starch for the Flocculation of Oil Sands Mature Fine Tailings

Polymeric flocculation of oil sands tailings: Unveiling rheological indicators and dynamics of bitumen release

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