Jump to main content
Jump to site search
SCHEDULED MAINTENANCE Close the message box

Maintenance work is planned for Monday 16 August 2021 from 07:00 to 23:59 (BST).

Website performance may be temporarily affected and you may not be able to access some PDFs or images. If this does happen, refreshing your web browser should resolve the issue. We apologise for any inconvenience this might cause and thank you for your patience.


Issue 17, 2020

An environmentally friendly route for beneficiation of rare earth-bearing minerals by Pickering emulsification: adjusting the interfacial and formulation parameters

Author affiliations

Abstract

The performance of the Pickering emulsification process to selectively separate rare earth-bearing minerals from the associated gangue and to concentrate them in a novel environmentally friendly approach was enhanced by adjusting the interfacial conditions and the formulation parameters. The present study investigated the effects of interfacial tension, oil polarity and viscosity on the selective separation. Modifying the emulsion formulation and selecting an appropriate oil, oil to water volume ratio, and solid mass fraction can enhance the recovery and grade of rare earth bearing minerals in the product when compared with conventional flotation. Various oils with different viscosities and chemical compositions (silicone oil, oleic acid, paraffin, and kerosene) supplemented with an additive (1% 1-hexanol) to modify the interfacial tension, and a continuous phase other than water (i.e., 90% ethylene glycol) were tested. An oil viscosity of 200 cSt, oil-to-water ratio of 10%v, and a solid particle concentration of 5 wt% provided the best selectivity. Since silicone oil is not economically feasible at industrial scale, paraffin oil, which is less expensive, was tested and provided better selectivity. We employed a Niobec ore containing bastnäsite and monazite with total rare earth elements of 3.3 wt%. The recovery of a one-stage emulsification was improved significantly by up to 56% using paraffin oil. It also resulted in a product enrichment ratio of approximately 2.7.

Graphical abstract: An environmentally friendly route for beneficiation of rare earth-bearing minerals by Pickering emulsification: adjusting the interfacial and formulation parameters

Article information


Submitted
30 Mar 2020
Accepted
10 Aug 2020
First published
10 Aug 2020

Green Chem., 2020,22, 5771-5784
Article type
Paper

An environmentally friendly route for beneficiation of rare earth-bearing minerals by Pickering emulsification: adjusting the interfacial and formulation parameters

R. Avazpour, M. Latifi, J. Chaouki and L. Fradette, Green Chem., 2020, 22, 5771 DOI: 10.1039/D0GC01134G

To request permission to reproduce material from this article, please go to the Copyright Clearance Center request page.

If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.

If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.

Read more about how to correctly acknowledge RSC content.


Social activity

Search articles by author

Spotlight

Advertisements