The effect of cellulose nanocrystals and pH value on the flotation process for extraction of minerals

Krivoshapkina, Elena F.; Mikhaylov, Vasily I.; Perovskiy, Igor A.; Торлопов, М. А.; Ryabkov, Yu. I.

doi:10.1007/s10971-019-04983-8

Cited by 8 publications

(3 citation statements)

References 33 publications

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“…Another size reduction method applies only to chemical processes. An example of cellulose nanostructures obtained by catalytic solvolysis carried out in the mixture with acetic acid and octanol-1 (Torlopov et al, 2015) is presented in a paper of Krivoshapkina et al (2019). Cellulose nanoparticles were 20 nm diameter and 220 nm length.…”

Section: Functionalised Nanocelluloses -Novel and Greener Alternativementioning

confidence: 99%

Evolution of ideas towards the implementation of nanoparticles as flotation reagents

Legawiec¹,

Polowczyk²

2020

Physicochem. Probl. Miner. Process.

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The paper discusses an idea of nanoparticles application to the flotation process. Due to the growing awareness of the environmental impact of industry and legal restrictions, the directions of research on new chemicals used in mineral processing, as well as in the other branches of industry are changing. The flotation reagents of the future should be, or are expected to be, readily biodegradable, but also their products should be harmless to the environment. A review of the works presented here presents an overview of the state-of-the-art application of nanostructures from early reported polystyrene nanoparticles to the most promising cellulose nanostructures which can be successfully adapted to the desired amphiphilicity parameters through simple functionalization. Limitations on the use of such nano-sized entities related to control aggregation in the flotation process and the ability to adsorb at interphase boundaries are also presented. Overall, nanoparticles can become universal flotation collectors and also an alternative to conventionally used hydrocarbon-based reagents.

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Section: Functionalised Nanocelluloses -Novel and Greener Alternativementioning

confidence: 99%

Evolution of ideas towards the implementation of nanoparticles as flotation reagents

Legawiec¹,

Polowczyk²

2020

Physicochem. Probl. Miner. Process.

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“…However, they assumed all the particles to be spherically shaped and quantified the interactions using Derjaguin, Landau, Verwey, and Overbeek (DLVO) model. 27 Another study by Hartmann et al used CNC as a collector for selective quartz flotation in the quartz-hematite mixture and determined the interactions using DLVO assuming CNCs as sphere and as a cylinder under two conditions�CNC perpendicular to mineral surface and CNC parallel to mineral surface and assumed minerals to be spherical. 28 CNCs may be useful as serpentine dispersants in nickel processing but have not yet been studied in this context.…”

Section: ■ Introductionmentioning

confidence: 99%

“…They predicted the CNC–mineral interactions are mainly electrostatic in nature where the CNCs adsorbed on the titania surface, changed titania’s surface charge from positive to negative, created a dispersed system. However, they assumed all the particles to be spherically shaped and quantified the interactions using Derjaguin, Landau, Verwey, and Overbeek (DLVO) model . Another study by Hartmann et al used CNC as a collector for selective quartz flotation in the quartz-hematite mixture and determined the interactions using DLVO assuming CNCs as sphere and as a cylinder under two conditionsCNC perpendicular to mineral surface and CNC parallel to mineral surface and assumed minerals to be spherical .…”

Section: Introductionmentioning

confidence: 99%

Cellulose Nanocrystals’ Role in Critical Mineral Beneficiation: Dual Aggregate-Dispersant Behavior Supports Environmentally Benign Nickel Processing

Khan

Shoaib

Molaei

et al. 2023

ACS Sustainable Chem. Eng.

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Environmentally unsustainable and toxic chemical flocculants and dispersants from nickel (Ni) processing contribute to industrial effluents that greatly impact biodiversity and aquatic life. Despite the industry’s efforts to reduce its ecological footprintprimarily due to the lack of commercially available biodegradable, environmentally benign, and nontoxic reagentsthese reagents continue to harm natural ecosystems. Chemicals used during the processing operations often target a specific unit operation that negatively affects downstream operations. Herein, we discover the concentration-dependent behavior of cellulose nanocrystals (CNCs) as a dispersant and flocculant, avoiding the use of various harmful chemicals in the nickel processing stages. Electrophoretic, optical brightfield microscopy, and quartz crystal microbalance-dissipation studies detected charge neutralization behavior by renewable and biodegradable CNCs, which can greatly benefit Ni processing operations. Microflotation experiments demonstrated that CNCs enhanced Ni recovery from 62 to 77 wt % and concentrate grade from 15 to 20 wt %. Settling and turbidity studies demonstrated the dual flocculant-dispersant behavior of CNCs resulting from the alignment of CNC fibers along the octahedral brucite basal and amphoteric edge plane of serpentine. CNCs can be used as dispersants during froth flotation to improve Ni beneficiation and as postprocessing flocculants for tailings management and dewatering, which is one of the major environmental and social concerns facing the mining and mineral processing industry. In addition, this study paves the way for CNCs to be used as flocculants and dispersants in a range of industries from healthcare to pharmaceuticals to semiconductor devices.

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Extraction of unburned carbon from coal fly ash

Singh

Ghorai

Kar

2022

Handbook of Fly Ash

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The effect of cellulose nanocrystals and pH value on the flotation process for extraction of minerals

Cited by 8 publications

References 33 publications

Evolution of ideas towards the implementation of nanoparticles as flotation reagents

Evolution of ideas towards the implementation of nanoparticles as flotation reagents

Cellulose Nanocrystals’ Role in Critical Mineral Beneficiation: Dual Aggregate-Dispersant Behavior Supports Environmentally Benign Nickel Processing

Extraction of unburned carbon from coal fly ash

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