A study on the mechanism of calcium ion in promoting the sedimentation of illite particles

Yan, Xiaohui; Wei, Lubin; Wang, Jian; Yang, Qi; Zhai, Shihua; Lu, Jianmei

doi:10.1016/j.jwpe.2021.102153

Cited by 16 publications

(6 citation statements)

References 28 publications

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“…Although the hydrophobic flocculation system of the cassiterite particles does not entirely correspond to a colloidal system, the extended DLVO theory has been successfully applied to study the interaction energy between various ore particles [13,43]. In this study, the extended DLVO theory was also used to investigate the aggregation behaviour of cassiterite particles.…”

Section: Theoretical Backgroundmentioning

confidence: 99%

“…When calculating the electrostatic interaction energy, we assumed that the positions of the two colliding particles did not change and there was no slippage. For a symmetric system, the electrostatic interaction energy can be calculated as follows [13,43]:…”

Section: Theoretical Backgroundmentioning

confidence: 99%

“…The other is to induce fine particle aggregation [12]. Fine particles can be aggregated by using electrolytes [13], polymer flocculants [14], nonpolar oils [15], microbubbles [16] or surfactants [17]. The aggregation mechanism varies depending on the added agent [18].…”

Section: Introductionmentioning

confidence: 99%

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Hydrophobic Flocculation of Fine Cassiterite Using Alkyl Hydroxamic Acids with Different Carbon Chain Lengths as Collectors

Jin

Shi

2023

Molecules

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This work investigated the hydrophobic flocculation of cassiterite using four alkyl hydroxamic acids with varying carbon chain lengths, i.e., hexyl hydroxamate (C6), octyl hydroxamate (C8), decyl hydroxamate (C10) and dodecyl hydroxamate (C12), as collectors. Microflotation tests were performed to investigate the flotation behaviour of cassiterite in the presence of the four alkyl hydroxamic acids. Focused beam reflectance measurement (FBRM) and a particle video microscope (PVM) were used to analyse and monitor the real-time evolution of the particle size distribution of cassiterite and the images of flocs during flocculation. The extended DLVO theory interaction energies between the cassiterite particles were calculated on the basis of the measured contact angle and the zeta potential of cassiterite to determine the aggregation and dispersion behaviour of the cassiterite particles. The microflotation test results suggested that the floatability of cassiterite improved with the increase in the carbon chain length of hydroxamates. FBRM, PVM images and extended DLVO theory calculation results indicated that when C6 was used as the collector, the cassiterite particles could not form hydrophobic flocs because the total potential energy between them was repulsive. When C8, C10 and C12 were used as collectors, the energy barrier amongst particles decreased with increasing hydroxamate concentration. The lowest concentrations of C8, C10 and C12 that could cause the hydrophobic aggregation of cassiterite were approximately 1 × 10−3, 1 × 10−4 and 2 × 10−5 mol/L, respectively. The aggregation growth rate and apparent floc size increased with an increasing collector concentration. Hydroxamic acid with a longer carbon chain could induce the cassiterite particles to form larger flocs at a lower concentration in a shorter time.

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Section: Theoretical Backgroundmentioning

confidence: 99%

Section: Theoretical Backgroundmentioning

confidence: 99%

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Hydrophobic Flocculation of Fine Cassiterite Using Alkyl Hydroxamic Acids with Different Carbon Chain Lengths as Collectors

Jin

Shi

2023

Molecules

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“…Although the properties of slime water in different coal preparation plants do vary, it is generally composed of clay minerals, oxide minerals, sulfide minerals, sulfate minerals, carbonate minerals and a large number of coal particles. Among them, clay minerals (mainly kaolinite, montmorillonite, illite) and quartz, which account for more than 60% of the total mineral mass, are the main reasons for the difficulties encountered in coal slurry treatment (Lin et al, 2010;Yan et al, 2021). On the one hand, these clay minerals have special crystal structures, which are prone to argillization and impact cracking, and thus produce a large number of hard-to-treat slurry.…”

Section: Introductionmentioning

confidence: 99%

“…Many studies have been published on the flocculation settlement laws of suspended particles in slime water (Chen et al, 2015(Chen et al, , 2019Y. Li et al, 2019;Kim et al, 2020;Yan et al, 2021;Zhu et al, 2021). Montmorillonite not only has large surface activity, but can also change the fluid characteristics of the liquid.…”

Section: Introductionmentioning

confidence: 99%

Study of flocculation performance and mechanism of ultrafine montmorillonite particles with NPAM

Wang¹,

Min²,

Chen³

et al. 2022

Physicochem. Probl. Miner. Process.

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Ultrafine montmorillonite particles are the main clay minerals in industrial wastewater. In order to explore the flocculation performance and mechanism of flocculant with montmorillonite, the effects of nonionic polyacrylamide (NPAM) dosage and molecular weight on flocculation effect were studied using a flocculation sedimentation experiment. The morphology of flocs was observed by metallographic microscope and scanning electron microscope, and the microscopic adsorption mechanism was studied utilizing density functional theory (DFT). The results show that the best reagent system for the montmorillonite sample is that the molecular weight of NPAM is 14 million and the added amount is 100 g/t. The floc size increases with rising NPAM dosage, forming a unique multilevel compact space network structure through polymer bridging. The adsorption energy of acrylamide on the Na-( 001) surface of montmorillonite is -108.81 kJ/mol, which is significantly higher than -50.66 kJ/mol on the None-(001) surface. Hydrogen bonding is not the main reason for the adsorption of acrylamide on the montmorillonite surface. NPAM mainly causes the flocculation and sedimentation of montmorillonite through the processes of polymer bridging and electrostatic attraction. This study can provide a theoretical basis for the design and synthesis of new flocculants.

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A brief overview on advances in water treatment process

Kumar

Bora

Chokshi

et al. 2023

3D Printing Technology for Water Treatment Applications

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A study on the mechanism of calcium ion in promoting the sedimentation of illite particles

Cited by 16 publications

References 28 publications

Hydrophobic Flocculation of Fine Cassiterite Using Alkyl Hydroxamic Acids with Different Carbon Chain Lengths as Collectors

Hydrophobic Flocculation of Fine Cassiterite Using Alkyl Hydroxamic Acids with Different Carbon Chain Lengths as Collectors

Study of flocculation performance and mechanism of ultrafine montmorillonite particles with NPAM

A brief overview on advances in water treatment process

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