Special Issue "High-Tech Metals Distribution in Bauxites: From the Ore Genesis to the Bayer Process Residue"
Deadline for manuscript submissions: 31 May 2019
Bauxite is a residual rock, consisting mainly of a mixture of aluminum hydroxides, of which industrial signiﬁcance is primarily due to its proﬁtably exploitable alumina contents. In the last few decades, bauxite ores have also been considered as a possible resource for a great number of economically-interesting elements, including some High-Tech Metals (HTM) such as REEs+Y+Sc, V, Co, Ni, Ga, Ge, and In. HTM, which are generally “co-elements”, mainly recovered as byproducts of other metallic ores, are important in a wide range of modern technologies, and their availability is generally poor relative to the current demand. Assuring supplies of HTM, largely used in modern engineered materials but subject to supply risks or concerns about availability, is a compelling challenge. This Special Issue aims to publish papers dealing with HTM behavior in bauxites and in the residue of the Bayer process developed on bauxite ores (Red Muds). Papers providing the assessment of HTM content in bauxite ores and their residue and the evaluation of the structural bonding of HTM into the supergene ore minerals, in the perspective of the determination of the best treatment for making HTM amenable to low-cost recovery are also welcome.
Dr. Giovanni Mongelli
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 papers will be 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. Minerals is an international peer-reviewed open access monthly 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 1400 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.
- Bauxite ores
- Red muds
- High tech metals distribution and recovery
- Mineralogical control
The below list represents only planned manuscripts. Some of these manuscripts have not been received by the Editorial Office yet. Papers submitted to MDPI journals are subject to peer-review.
Title: Overview of Known Alkaliphilic Bacteria from Red Mud
Author: Gunther Brucha
Abstract: Alkaliphilic bacteria typically grow well at pH 9, with the most extremophilic strains growing up to pH values as high as pH 12–13. This group of bacteria have the ability to metabolically reduce alkalinity and have tolerance of high concentrations of ions and metals. Interest in extreme alkaliphiles arises because they are sources of useful, stable enzymes, and the cells themselves can be used for biotechnological and other applications at high pH. Many industrial processes produce highly alkaline wastes that are contaminated with toxic trace metals/metalloid. In this way, the use of alkaliphilic microorganisms is considered an attractive alternative method for treatment of industrial alkaline residues. Bauxite refining is one of activities that most produce highly alkaline wastes. Alumina extraction from bauxite using concentrated sodium hydroxide in the Bayer process generates a slurry and an extremely alkaline (pH of 9 to 13) byproduct known as bauxite residue or red mud. For each ton of alumina extracted from bauxite, approximately 1.5-2.0 tons of bauxite residue is generated. Disposal of such a byproduct is a serious problem at alumina plants because of environmental risks and financial costs. In this way, it is very important to know bacteria that can survive in such an extreme environmental since these bacteria could be used as a method for treatment of alkaline residues. Firmicutes has been described as one of the most representative bacterial phyla in bauxite residue, and the Bacillus genus as one of the most frequent. Different species of Bacillus were already isolated from red muds and showed a great potential for bioremediation process. For this reason, the aim of this article is to do a review about the study of alkaliphilic bacteria isolated from red mud.