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Minerals
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Selective Disintegration: Theory and Practice
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Selective Disintegration: Theory and Practice

A special issue of Minerals (ISSN 2075-163X). This special issue belongs to the section "Mineral Processing and Extractive Metallurgy".

Deadline for manuscript submissions: closed (30 November 2021) | Viewed by 14108

Special Issue Editors

Dr. Tatyana Nikolayevna Aleksandrova

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Guest Editor
Saint Petersburg Mining University, St Petersburg 199106, Russia
Interests: selective disintegration and separation; gold ores; selective sulfide flotation; modeling of disintegration and separation processes
Dr. Nadezhda N. Nikolaeva

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Guest Editor
Saint Petersburg Mining university, St Petersburg 199106, Russia
Interests: selective disintegration; modeling of disintegration and separation processes

Special Issue Information

Dear Colleagues,

The effective involvement of refractory and low-grade ores in processing requires new approaches to the processes of disintegration and beneficiation, making it possible to extract valuable components economically and without significant environmental damage. The share of refractory and low-grade mineral raw materials of natural origin is constantly increasing, and scientifically valid approaches to the creation of rational, flexible technological circuits and processes have not yet been developed. The complexity of the deep processing of finely disseminated mineral raw materials is due to the difficulty of liberating valuable components and intergrown pieces during disintegration for their recovery as commercial products of conditional quality.

It is thus evident that there is a crucial need for research into the liberation of finely disseminated mineral intergrowth via selective disintegration; increasing the separation selectivity of mineral complexes; correlational studies of structural, material, and phase composition with the physical, physicochemical, and technological properties of minerals; and combined methods for the physicochemical and mathematical modelling of the disintegration and separation of minerals, with experimental research as well as the development of theory of the intergranular breakage of mineral complexes.

We welcome fundamental studies (experimental as well as theoretical) in the field of selective disintegration, deep and complex investigations of the interrelation of structural, material, and phase composition with the physical, physicochemical, and technological properties of minerals; physicochemical and mathematical modelling of disintegration processes; as well as articles containing analyses of global experiences of selective disintegration applications.

Dr. Tatyana Nikolayevna Aleksandrova
Dr. Nadezhda N. Nikolaeva
Guest Editors

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. 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 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.

Keywords

  • selective disintegration
  • equipment for selective crushing and grinding
  • theory of process fracture
  • mineralogical and petrographic features of ores
  • quantitative mineralogical analysis and rock tomography
  • selective disintegration practices in ore processing

Published Papers (5 papers)

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Research

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15 pages, 6505 KiB  
Article
Selective Disintegration Justification Based on the Mineralogical and Technological Features of the Polymetallic Ores
by Tatiana Aleksandrova, Nadezhda Nikolaeva, Anastasia Afanasova, Artyem Romashev and Valentin Kuznetsov
Minerals 2021, 11(8), 851; https://0-doi-org.brum.beds.ac.uk/10.3390/min11080851 - 07 Aug 2021
Cited by 19 | Viewed by 2389
Abstract
Deterioration of mineralogical and physical characteristics of mineral raw materials results in the formation of the primary task for the comminution processes—reduction in the size of ore to obtain a material with a certain granulometric composition, which in turn is achieved by overgrinding [...] Read more.
Deterioration of mineralogical and physical characteristics of mineral raw materials results in the formation of the primary task for the comminution processes—reduction in the size of ore to obtain a material with a certain granulometric composition, which in turn is achieved by overgrinding of raw materials and, consequently, an increase in energy costs. The work aimed to justify the possibility of selective disintegration of mineral assemblages of polymetallic ores of various genesis at the stage of crushing based on in-depth investigation and revealing of interrelation and mutual influence of mineralogical-geochemical features, textural-structural and technological properties. Structural and textural features have been studied by the methods of computed X-ray microtomography. Experimental and theoretical investigations of mineralogical and technological parameters of raw materials, as well as research on crushing using different types of crushers, made it possible to substantiate the possibility of selective disintegration for polymetallic ores. Full article
(This article belongs to the Special Issue Selective Disintegration: Theory and Practice)
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15 pages, 7859 KiB  
Article
Analysis of the Effect of Dry Magnetic Separation on the Process of Ferruginous Quartzites Disintegration
by Darya Nikolaevna Shibaeva, Alena Arkad’evna Kompanchenko and Sergey Vasil’evich Tereschenko
Minerals 2021, 11(8), 797; https://0-doi-org.brum.beds.ac.uk/10.3390/min11080797 - 22 Jul 2021
Cited by 6 | Viewed by 2089
Abstract
The paper considers the results of the application of dry magnetic separation on samples of ferruginous quartzites of the Kostomuksha ore field, represented by refractory ore, free-milling ore, and their mixture. The assessment of the influence of the ore texture on the technological [...] Read more.
The paper considers the results of the application of dry magnetic separation on samples of ferruginous quartzites of the Kostomuksha ore field, represented by refractory ore, free-milling ore, and their mixture. The assessment of the influence of the ore texture on the technological parameters of dry magnetic separation indicates their insignificant changes: the yield of the non-magnetic product varies from 12.4 to 13.5%, and the Fetotal content in the magnetic product increases by 1.11–1.14 times. A decrease of at least 15% in the number of harmful impurities was found: S by 16.2–17.3%, SiO2 by 15.5–21.1%, and Al2O3 by 39.1–48.4%. The authors have performed a comparative assessment of the granularity of the initial ore and the magnetic product with the measurement of energy consumption, as well as an analysis of the magnetite liberation on particle sizes of less than 2 mm. It was found that due to the release of a non-magnetic product in the amount of 12.3–14.5%, represented by non-magnetite or weakly mineralized rock varieties, energy consumption for the crushing process is reduced by at least 5%. The mineral liberation assessment showed that mainly free magnetite is contained in the −0.4 mm fineness class. It was found that in the magnetic separation product of the refractory ore sample, the amount of liberated magnetite in the size class −1 + 0 mm increases by 12.1% compared to the initial ore sample. For the free-milling ore sample, the opposite trend is observed: a decrease in the amount of free magnetite by 30.9% in the magnetic product. Analysis of the magnetite liberation in the mixture indicates deterioration in the results obtained during the separate crushing of refractory and free-milling ore and a decrease in the amount of liberated magnetite in the magnetic product by 60% compared to the initial ore. Full article
(This article belongs to the Special Issue Selective Disintegration: Theory and Practice)
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17 pages, 6139 KiB  
Article
Semi-Autogenous Wet Grinding Modeling with CFD-DEM
by Vladislav Lvov and Leonid Chitalov
Minerals 2021, 11(5), 485; https://0-doi-org.brum.beds.ac.uk/10.3390/min11050485 - 01 May 2021
Cited by 7 | Viewed by 3340
Abstract
The paper highlights the features of constructing a model of a wet semi-autogenous grinding mill based on the discrete element method and computational fluid dynamics. The model was built using Rocky DEM (v. 4.4.2, ESSS, Brazil) and Ansys Fluent (v. 2020 R2, Ansys, [...] Read more.
The paper highlights the features of constructing a model of a wet semi-autogenous grinding mill based on the discrete element method and computational fluid dynamics. The model was built using Rocky DEM (v. 4.4.2, ESSS, Brazil) and Ansys Fluent (v. 2020 R2, Ansys, Inc., United States) software. A list of assumptions and boundary conditions necessary for modeling the process of wet semi-autogenous grinding by the finite element method is presented. The created model makes it possible to determine the energy-coarseness ratios of the semi-autogenous grinding (SAG) process under given conditions. To create the model in Rocky DEM the following models were used: The Linear Spring Rolling Limit rolling model, the Hysteretic Linear Spring model of the normal interaction forces and the Linear Spring Coulomb Limit for tangential forces. When constructing multiphase in Ansys Fluent, the Euler model was used with the primary phase in the form of a pulp with a given viscosity and density, and secondary phases in the form of air, crushing bodies and ore particles. The resistance of the solid phase to air and water was described by the Schiller–Naumann model, and viscosity by the realizable k-epsilon model with a dispersed multiphase turbulence model. The results of the work methods for material interaction coefficients determination were developed. A method for calculating the efficiency of the semi-autogenous grinding process based on the results of numerical simulation by the discrete element method is proposed. Full article
(This article belongs to the Special Issue Selective Disintegration: Theory and Practice)
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10 pages, 1823 KiB  
Article
Particle Size Effects on Selectivity in Confined Bed Comminution
by Holger Lieberwirth and Lisa Kühnel
Minerals 2021, 11(4), 342; https://0-doi-org.brum.beds.ac.uk/10.3390/min11040342 - 26 Mar 2021
Cited by 5 | Viewed by 1949
Abstract
Confined bed comminution in high-pressure grinding rollers (HPGRs) and vertical roller mills (VRMs) was previously used preferably for grinding comparably homogeneous materials such as coal or clinker. Meanwhile, it started to complement or even replace tumbling mills in ore beneficiation with ore and [...] Read more.
Confined bed comminution in high-pressure grinding rollers (HPGRs) and vertical roller mills (VRMs) was previously used preferably for grinding comparably homogeneous materials such as coal or clinker. Meanwhile, it started to complement or even replace tumbling mills in ore beneficiation with ore and gangue particles of rather different breakage behaviors. The selectivity in the comminution of a mixture of particles with different strengths but similar particle size distribution (PSD) of the constituents in a particle bed was investigated earlier. The strength of a material is, however, also a function of particle size. Finer particles tend to be more competent than coarser ones of the same material. In industrial ore processing using confined bed comminution, this effect cannot be neglected but even be exploited to increase efficiency. This paper presents research results on this topic based on experimental investigations with model materials and with natural particles, which were stressed in a piston–die press. It appeared that the comminution result substantially depends on the material characteristics, the composition of the mixture and the PSD of the constituents. Conclusions will be drawn for the future applications of selective comminution in mineral processing. Full article
(This article belongs to the Special Issue Selective Disintegration: Theory and Practice)
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Review

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22 pages, 38619 KiB  
Review
Production Methods for Regular Aggregates and Innovative Developments in Poland
by Tomasz Gawenda
Minerals 2021, 11(12), 1429; https://0-doi-org.brum.beds.ac.uk/10.3390/min11121429 - 17 Dec 2021
Cited by 4 | Viewed by 3167
Abstract
The aim of this article is to present possibilities of producing aggregates with an increased content of regular particles in some well-known examples, as well as to present previously unused methods of aggregate production. Traditional aggregate production systems require the use of three [...] Read more.
The aim of this article is to present possibilities of producing aggregates with an increased content of regular particles in some well-known examples, as well as to present previously unused methods of aggregate production. Traditional aggregate production systems require the use of three or four grinding stages (depending on the particle size of the feed), but fine fractions contain approximately 10% irregular grains on average. The conducted research has shown that in innovative patented technological systems, it is possible to obtain regular aggregates with a share of irregular grains below 3%. The separated irregular aggregates can be crushed again or used for other purposes. The advantages of such inventions include less grinding stages, reduced dust, and lower energy consumption. Regular aggregates also have benefits compared to typical ones. The analyzed aggregate products from various mines showed that regular aggregates have better properties, for example, higher resistance to grinding and abrasion. This article also describes the advantages of using such aggregates for concrete or other applications. Full article
(This article belongs to the Special Issue Selective Disintegration: Theory and Practice)
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