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Sustainable Utilization of Primary and Secondary Raw Materials

A special issue of Applied Sciences (ISSN 2076-3417). This special issue belongs to the section "Materials Science and Engineering".

Deadline for manuscript submissions: closed (30 April 2022) | Viewed by 7548

Special Issue Editor

Special Issue Information

Dear Colleagues,

This Special Issue aims to provide an excellent forum for scientists and engineers to share and discuss their pioneering/original findings or insightful reviews on the sustainable utilization of primary and secondary raw materials. Reports on capturing the whole/wide raw material value chain via geometallurgical or process mineralogical approach are particularly encouraged. On the other hand, any kind of contribution under the broad frame work of sustainable utilization is also welcome.

Some potential contributions are listed below under “Keywords”. One of them is the complex ore/waste beneficiation via the development of a new characterization method and/or process intensification. For example, a proper characterization of complex/heterogeneous materials is still a challenging task, since the majority of characterization methods analyze either the average characteristics of the whole material or a narrow area of specific interest [1,2]. On the other hand, the efficient beneficiation of complex ore/waste strongly supported by their characterization has been in high demand in view of economic and environmental concerns [1].

Dr. Akira Otsuki
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Applied Sciences is an international peer-reviewed open access semimonthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2400 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

[1] Otsuki, A.; Chen, Y.; Zhao, Y. Characterisation and beneficiation of complex ores for sustainable use of mineral resources: Refractory gold ore beneficiation as an example. Int. J. Soc. Mat. Eng. Res. 2014, 20, 126–135.

[2] Otsuki, A.; Bryant, G. Characterization of the interactions within fine particle mixtures in highly concentrated suspensions for advanced particle processing. Adv. Colloid Interface Sci. 2015, 226, 37–43.

Keywords

  • Geometallurgy/process mineralogy
  • Complex ore/waste
  • Characterization
  • Process intensification
  • Environmental/economic evaluation

Published Papers (2 papers)

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Research

12 pages, 13570 KiB  
Article
Palladium Nanocatalysts on Hydroxyapatite: Green Oxidation of Alcohols and Reduction of Nitroarenes in Water
by Mohammadreza Shokouhimehr, Samaneh Mahmoudi-Gom Yek, Mahmoud Nasrollahzadeh, Aejung Kim and Rajender S. Varma
Appl. Sci. 2019, 9(19), 4183; https://doi.org/10.3390/app9194183 - 7 Oct 2019
Cited by 86 | Viewed by 4420
Abstract
A green procedure is described for supporting Pd nanoparticles on hydroxyapatite (HAP), which serves as a highly-stable heterogeneous catalyst displaying excellent activity for the aqueous expeditious reduction of nitroaromatics to the corresponding amines with sodium borohydride, and oxidation of primary and secondary alcohols [...] Read more.
A green procedure is described for supporting Pd nanoparticles on hydroxyapatite (HAP), which serves as a highly-stable heterogeneous catalyst displaying excellent activity for the aqueous expeditious reduction of nitroaromatics to the corresponding amines with sodium borohydride, and oxidation of primary and secondary alcohols by hydrogen peroxide with high yields and selectivities. The structural features of the prepared catalyst are confirmed by latest techniques including field emission scanning electron microscopy, transmission electron microscopy, energy-dispersive X-ray spectroscopy, and X-ray photoelectron spectroscopy. The reusability of the heterogeneous catalyst was affirmed in the aqueous reduction of nitrobenzene and oxidation of cycloheptanol for six consecutive runs without significant loss of catalytic activity. Full article
(This article belongs to the Special Issue Sustainable Utilization of Primary and Secondary Raw Materials)
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16 pages, 2880 KiB  
Article
Mineralogical and Geochemical Constraints of the REE Accumulation in the Almásfüzitő Red Mud Depository in Northwest Hungary
by Tivadar M. Tóth, Félix Schubert, Béla Raucsik and Krisztián Fintor
Appl. Sci. 2019, 9(18), 3654; https://doi.org/10.3390/app9183654 - 4 Sep 2019
Cited by 10 | Viewed by 2211
Abstract
Detailed mineralogical and geochemical study of red mud samples from Hungary suggests geological and geochemical processes that determine the spatial distribution of certain elements inside the red mud pitfalls. The major processes are the following: (1) Heavy mineral grains (anatase, rutile, titanomagnetite, etc.) [...] Read more.
Detailed mineralogical and geochemical study of red mud samples from Hungary suggests geological and geochemical processes that determine the spatial distribution of certain elements inside the red mud pitfalls. The major processes are the following: (1) Heavy mineral grains (anatase, rutile, titanomagnetite, etc.) tend to subside due to gravitational differentiation and at present accumulate in the deepest horizons of the pitfalls. (2) Kaolinite reacts to cancrinite under hyperalkaline conditions. (3) Due to diagenetic processes, goethite-cancrinite aggregates form in situ. (4) Light mineral grains (e.g., cancrinite) move upward. (5) Cancrinite transforms to calcite at the shallowest horizons, due probably to the reaction with atmospheric CO2. All these processes have a significant role in accumulation tendencies of different groups of elements inside the pitfalls. The behaviour of chalcophile elements and the HFSE elements follow common geochemical rules and remind features of the host bauxite or even its precursor igneous or metamorphic lithologies. The REEs and Sc are possibly adsorbed on goethite and in the channels of cancrinite. Based on linear mixing model calculations, the major container of these elements is cancrinite. The proportion of the REEs and Sc in the Ti-phases, carbonates, phosphates, zircon, etc. is subordinate relative to the amount accumulated by goethite and cancrinite. Full article
(This article belongs to the Special Issue Sustainable Utilization of Primary and Secondary Raw Materials)
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