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University of Melbourne
1.
Ng, Wei Sung.
Novel temperature-responsive polymers as flocculants and collectors in froth flotation.
Degree: 2017, University of Melbourne
URL: http://hdl.handle.net/11343/207989
► In recent decades, the study of stimuli-responsive polymers has unlocked a host of potential applications in various fields of research, including drug delivery systems, tissue…
(more)
▼ In recent decades, the study of stimuli-responsive polymers has unlocked a host of potential applications in various fields of research, including drug delivery systems, tissue engineering, wastewater treatment, chemical sensing, gel actuation, food and beverage packaging, and textiles. The use of these materials revolves around their ability to exhibit a sharp change in properties following variations in environmental conditions, such as pH, temperature, light, magnetic fields, chemical concentrations, and mechanical force. A common example is poly(N-isopropyl acrylamide) (PNIPAM), a temperature-responsive polymer which remains hydrophilic in solution when maintained below a specific transition temperature, termed the lower critical solution temperature (LCST). Upon heating above the LCST, the polymer undergoes a reversible coil-to-globule transition into an insoluble state, displaying hydrophobic properties.
The ability of the thermo-responsive materials to switch between hydrophilic and hydrophobic behaviour under a change in temperatures can potentially be used to assist in separation processes that sort and recover compounds based on differences in surface wettability. The treatment of minerals with froth flotation is one such process, which separates valuable particles from unwanted gangue based on the differential water wettability of particle surfaces. A selective surfactant, termed a “collector”, is typically added in flotation to preferentially modify the surface of the desired particles to reduce the water wettability. The hydrophobic surface facilitates attachment onto bubbles introduced in flotation, which in turn recovers and concentrates the targeted particles into a high-grade product. Conversely, the unwanted gangue remains hydrophilic and is discarded as waste tailings.
This thesis seeks to explain whether temperature-responsive materials are able to function as selective collectors in froth flotation, and to discover new opportunities by exploiting the thermo-switchable properties of the polymers. A possible area for improvement involves the treatment of valuable fine particles below 20 µm in size, which are typically difficult to recover under normal flotation conditions in practice. The use of temperature-responsive materials can potentially enhance recoveries by inducing the formation of particle aggregates through the hydrophobic transition of the polymer such that the resulting aggregates are sufficiently large to be recovered via flotation. Furthermore, the coating of fine valuable particles on coarser gangue particles typically results in grade dilution. This could be prevented with the use of thermo-responsive polymers, as the selective aggregation of the fine valuables effectively acts as a desliming process. The tuneable hydrophilic-hydrophobic properties of the polymer also allows for potential use as a depressant, which performs the opposite function of a collector, under a temperature switch.
The focus of this work is to investigate the performance of temperature-responsive…
Subjects/Keywords: temperature-responsive polymers; selective flocculation; froth flotation
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APA (6th Edition):
Ng, W. S. (2017). Novel temperature-responsive polymers as flocculants and collectors in froth flotation. (Doctoral Dissertation). University of Melbourne. Retrieved from http://hdl.handle.net/11343/207989
Chicago Manual of Style (16th Edition):
Ng, Wei Sung. “Novel temperature-responsive polymers as flocculants and collectors in froth flotation.” 2017. Doctoral Dissertation, University of Melbourne. Accessed January 20, 2021.
http://hdl.handle.net/11343/207989.
MLA Handbook (7th Edition):
Ng, Wei Sung. “Novel temperature-responsive polymers as flocculants and collectors in froth flotation.” 2017. Web. 20 Jan 2021.
Vancouver:
Ng WS. Novel temperature-responsive polymers as flocculants and collectors in froth flotation. [Internet] [Doctoral dissertation]. University of Melbourne; 2017. [cited 2021 Jan 20].
Available from: http://hdl.handle.net/11343/207989.
Council of Science Editors:
Ng WS. Novel temperature-responsive polymers as flocculants and collectors in froth flotation. [Doctoral Dissertation]. University of Melbourne; 2017. Available from: http://hdl.handle.net/11343/207989

University of Alberta
2.
Parrent, Marc Donald.
Separation of Pyrolusite and Hematite by Froth
Flotation.
Degree: MS, Department of Chemical and Materials
Engineering, 2012, University of Alberta
URL: https://era.library.ualberta.ca/files/s7526c991
► Due to challenges faced by the Wabush mine, the separation of pyrolusite and hematite using froth flotation was investigated. Using sodium oleate as a collector,…
(more)
▼ Due to challenges faced by the Wabush mine, the
separation of pyrolusite and hematite using froth flotation was
investigated. Using sodium oleate as a collector, micro-scale
flotation testing identified conditions for selective separation of
pyrolusite and hematite. When applied to Wabush iron ore on a
bench-scale, direct flotation produced hematite concentrates
meeting the target of 90% mass pull at 40% Mn rejection. Two
separate bench-scale conditions achieved the target; the first at
pH 11 using 200 g/t sodium oleate, and the second at pH 9 using 200
g/t sodium oleate and 250 g/t potato starch. Fourier transform
infrared spectroscopy (FTIR) was used to study adsorption of oleate
on pyrolusite and hematite. At pH 11 oleate was bound to hematite
via a mixture of inner-sphere monodentate mononuclear (ISMM) and
open-sphere surface hydration-shared (OS-HS) modes, while
adsorption on pyrolusite was primarily ISMM with contributions from
(OS-HS) and inner-sphere bidentate binuclear (ISBB)
modes.
Subjects/Keywords: selective flotation; iron ore; sodium oleate; pyrolusite; hematite; flotation
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APA ·
Chicago ·
MLA ·
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CSE |
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APA (6th Edition):
Parrent, M. D. (2012). Separation of Pyrolusite and Hematite by Froth
Flotation. (Masters Thesis). University of Alberta. Retrieved from https://era.library.ualberta.ca/files/s7526c991
Chicago Manual of Style (16th Edition):
Parrent, Marc Donald. “Separation of Pyrolusite and Hematite by Froth
Flotation.” 2012. Masters Thesis, University of Alberta. Accessed January 20, 2021.
https://era.library.ualberta.ca/files/s7526c991.
MLA Handbook (7th Edition):
Parrent, Marc Donald. “Separation of Pyrolusite and Hematite by Froth
Flotation.” 2012. Web. 20 Jan 2021.
Vancouver:
Parrent MD. Separation of Pyrolusite and Hematite by Froth
Flotation. [Internet] [Masters thesis]. University of Alberta; 2012. [cited 2021 Jan 20].
Available from: https://era.library.ualberta.ca/files/s7526c991.
Council of Science Editors:
Parrent MD. Separation of Pyrolusite and Hematite by Froth
Flotation. [Masters Thesis]. University of Alberta; 2012. Available from: https://era.library.ualberta.ca/files/s7526c991

University of Oulu
3.
Hartmann, R. (Robert).
Flotation using cellulose-based chemicals.
Degree: 2018, University of Oulu
URL: http://urn.fi/urn:isbn:9789526219806
► Abstract Flotation is a well-known and widely used technique for the separation of particles smaller than 250 µm, but efficient performance requires the use of…
(more)
▼ Abstract
Flotation is a well-known and widely used technique for the separation of particles smaller than 250 µm, but efficient performance requires the use of various synthetic chemicals which can potentially damage the health of humans and animals and pollute the environment. Consequently, their replacement through a more environment-friendly and sustainable alternative has been demanded. One promising candidate is cellulose, which is an abundant natural polymer that is environment-friendly and can be treated chemically and physically to yield tailored properties and thus a potential for use in processes such as flotation.
This work focuses on the use of cellulose-based reagents in flotation processes to replace the often harmful conventional reagents derived from mineral oil, plant oils or animal fats. The physico-chemical properties of cellulose differ from those of conventional reagents, leading to differences in performance during flotation. In particular, the chemical and morphological heterogeneity of cellulose affects its properties and thus its interaction with minerals and water. Consequently, its use requires the study of the fundamentals of flotation and their application including the physico-chemical heterogeneity of cellulose to determine the optimum conditions and enable efficient performance. This work focuses on the determination of the thermodynamic surface energetics of solid particles and changes in this after reagent adsorption, using the inverse gas chromatography technique in a dry atmosphere. Furthermore, interactions between cellulose and minerals immersed in water are investigated using the DLVO theory, the interaction forces between cellulose and the minerals being derived and correlated with flotability. The importance of free surface charges is then considered by investigating the electric surface potential of cellulose-coated minerals in connection with particle-bubble attachment efficiency. At the same time, conventional amphiphilic reagents are used and its performances are related to cellulose-based reagents.
Tiivistelmä
Vaahdotus on kaivannaisteollisuudessa laajasti käytössä oleva prosessi, jonka avulla saadaan erotettua tehokkaasti pieniä, alle 250 µm kokoisia partikkeleita. Vaahdotuksen apuaineena käytetään erilaisia synteettisiä kemikaaleja, jotka voivat aiheuttaa harmia ympäristölle. Siksi niiden korvaaminen ympäristöystävällisemmillä vaihtoehdoilla on tärkeää. Yksi lupaava vaihtoehto korvaavaksi materiaaliksi on selluloosa. Selluloosa on uusiutuva ja ympäristöystävällinen luonnonpolymeeri, josta voidaan valmistaa kemiallisesti ja fysikaalisesti käsittelemällä erilaisia biokemikaaleja. Näitä voidaan soveltaa erilaisissa prosesseissa, myös vaahdotuksessa.
Tässä työssä keskitytään selluloosapohjaisten kemikaalien käyttöön vaahdotuksessa tavanomaisten, usein haitallisten synteettisten kemikaalien korvaamiseksi. Selluloosan fysikaaliskemialliset ominaisuudet eroavat synteettisten vaahdotuskemikaalien ominaisuuksista, mikä vaikuttaa niiden vuorovaikutukseen mineraalien ja veden…
Advisors/Committee Members: Illikainen, M. (Mirja).
Subjects/Keywords: DLVO theory; Free Energy of Interaction; aminated cellulose nanocrystals; electrostatic heterogeneity; selective flotation; DLVO teoria; nanokiteinen selluloosa; selektiivinen flotaatio; sähköstaattinen heterogenisuus; vapaa energia
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❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Hartmann, R. (. (2018). Flotation using cellulose-based chemicals. (Doctoral Dissertation). University of Oulu. Retrieved from http://urn.fi/urn:isbn:9789526219806
Chicago Manual of Style (16th Edition):
Hartmann, R (Robert). “Flotation using cellulose-based chemicals.” 2018. Doctoral Dissertation, University of Oulu. Accessed January 20, 2021.
http://urn.fi/urn:isbn:9789526219806.
MLA Handbook (7th Edition):
Hartmann, R (Robert). “Flotation using cellulose-based chemicals.” 2018. Web. 20 Jan 2021.
Vancouver:
Hartmann R(. Flotation using cellulose-based chemicals. [Internet] [Doctoral dissertation]. University of Oulu; 2018. [cited 2021 Jan 20].
Available from: http://urn.fi/urn:isbn:9789526219806.
Council of Science Editors:
Hartmann R(. Flotation using cellulose-based chemicals. [Doctoral Dissertation]. University of Oulu; 2018. Available from: http://urn.fi/urn:isbn:9789526219806
4.
ΛΑΖΑΡΙΔΗΣ, ΝΙΚΟΛΑΟΣ.
ΕΚΛΕΚΤΙΚΗ ΑΠΟΜΑΚΡΥΝΣΗ ΙΟΝΤΩΝ ΧΑΛΚΟΥ, ΨΕΥΔΑΡΓΥΡΟΥ ΚΑΙ ΑΡΣΕΝΙΚΟΥ ΑΠΟ ΥΔΑΤΙΚΑ ΔΙΑΛΥΜΑΤΑ ΜΕ ΤΕΧΝΙΚΕΣ ΕΠΙΠΛΕΥΣΗΣ.
Degree: 1991, Αριστοτέλειο Πανεπιστήμιο Θεσσαλονίκης (ΑΠΘ); Aristotle University Of Thessaloniki (AUTH)
URL: http://hdl.handle.net/10442/hedi/1804
► THE SCOPE OF THIS WORK IS TO INVESTIGATE THE FEASIBILITY OF THE SELECTIVE SEPARATION OF COPPER, ZINC AND ARSENIC IONS FROM DILUTE AQUEOUS SOLUTIONS USING…
(more)
▼ THE SCOPE OF THIS WORK IS TO INVESTIGATE THE FEASIBILITY OF THE SELECTIVE SEPARATION OF COPPER, ZINC AND ARSENIC IONS FROM DILUTE AQUEOUS SOLUTIONS USING FLOTATION TECHNIQUES. THE FLOTATION TECHNIQUES USED WERE: ION FLOTATION, PRECIPITATE FLOTATION AND ADSORBING COLLOID FLOTATION. THE CONTINUOUS FLOW EXPERIMENTS WERE CONDUCTED BY DISPERSED-AIR IN A FLOTATION COLUMN. THE BATCH EXPERIMENTS WERECARRIED OUT WITH DISSOLVED-AIR JARS. THE SELECTIVE SEPARATION WAS SUCCESSFULLYACHIEVED BY SELECTIVE PRECIPITATION FOLLOWED BY FLOTATION. THE SELECTIVE PRECIPITANTS WERE: SODIUM SULFIDE, XANTHATE SALT AND DITHIO-CARBONATE SALT.
Ο ΣΚΟΠΟΣ ΤΗΣ ΔΙΑΤΡΙΒΗΣ ΕΙΝΑΙ Η ΜΕΛΕΤΗ ΤΗΣ ΔΥΝΑΤΟΤΗΤΑΣ ΕΚΛΕΚΤΙΚΟΥ ΔΙΑΧΩΡΙΣΜΟΥ ΙΟΝΤΩΝ ΧΑΛΚΟΥ, ΨΕΥΔΑΡΓΥΡΟΥ ΚΑΙ ΑΡΣΕΝΙΚΟΥ ΑΠΟ ΑΡΑΙΑ ΥΔΑΤΙΚΑ ΔΙΑΛΥΜΑΤΑ, ΜΕ ΤΗ ΧΡΗΣΙΜΟΠΟΙΗΣΗ ΤΕΧΝΙΚΩΝ ΕΠΙΠΛΕΥΣΗΣ. ΟΙ ΤΕΧΝΙΚΕΣ ΠΟΥ ΧΡΗΣΙΜΟΠΟΙΗΘΗΚΑΝ ΗΤΑΝ: ΙΟΝΙΚΗ ΕΠΙΠΛΕΥΣΗ, ΕΠΙΠΛΕΥΣΗ ΙΖΗΜΑΤΟΣ, ΕΠΙΠΛΕΥΣΗ ΜΕ ΠΡΟΣΡΟΦΗΣΗ ΣΕ ΚΟΛΛΟΕΙΔΕΣ. ΟΙ ΣΥΣΚΕΥΕΣ ΠΟΥ ΧΡΗΣΙΜΟΠΟΙΗΘΗΚΑΝ ΗΤΑΝ: ΔΙΑΛΥΜΕΝΟΥ ΑΕΡΑ (ΑΣΥΝΕΧΗΣ ΡΟΗ) ΚΑΙ ΔΙΑΣΠΑΡΜΕΝΟΥ ΑΕΡΑ(ΣΥΝΕΧΗΣ ΡΟΗ). Η ΕΚΛΕΚΤΙΚΗ ΑΠΟΜΑΚΡΥΝΣΗ ΕΠΙΤΕΥΧΘΗΚΕ ΜΕ ΕΚΛΕΚΤΙΚΗ ΚΑΤΑΒΥΘΙΣΗ ΚΑΙΑΚΟΛΟΥΘΗΣΕ Η ΕΠΙΠΛΕΥΣΗ. ΩΣ ΕΚΛΕΚΤΙΚΗ ΚΑΤΑΒΥΘΙΣΤΙΚΗ ΧΡΗΣΙΜΟΠΟΙΗΘΗΚΑΝ ΤΑ: ΘΕΙΟΥΧΟ ΝΑΤΡΙΟ, ΞΑΝΘΟΓΟΝΙΚΟ ΑΛΑΣ ΚΑΙ ΔΙΘΕΙΟΚΑΡΒΑΜΙΔΙΚΟ ΑΛΑΣ.
Subjects/Keywords: ADSORBING COLLOID FLOTATION; Dispersed-air flotation; Dissolved-air flotation; ION FLOTATION; PRECIPITATE FLOTATION; SELECTIVE FLOTATION OF COPPER-ZINC-ARSENIC; ΕΚΛΕΚΤΙΚΗ ΕΠΙΠΛΕΥΣΗ ΧΑΛΚΟΥ-ΨΕΥΔΑΡΓΥΡΟΥ-ΑΡΣΕΝΙΚΟΥ ΙΟΝΙΚΗ ΕΠΙΠΛΕΥΣΗ; Επίπλευση διαλυμένου αέρα; ΕΠΙΠΛΕΥΣΗ ΔΙΑΣΠΑΡΜΕΝΟΥ ΑΕΡΑ; ΕΠΙΠΛΕΥΣΗ ΙΖΗΜΑΤΟΣ; ΕΠΙΠΛΕΥΣΗ ΜΕ ΠΡΟΣΦΡΟΦΗΣΗ ΣΕ ΚΟΛΛΟΕΙΔΕΣ
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❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
ΛΑΖΑΡΙΔΗΣ, . (1991). ΕΚΛΕΚΤΙΚΗ ΑΠΟΜΑΚΡΥΝΣΗ ΙΟΝΤΩΝ ΧΑΛΚΟΥ, ΨΕΥΔΑΡΓΥΡΟΥ ΚΑΙ ΑΡΣΕΝΙΚΟΥ ΑΠΟ ΥΔΑΤΙΚΑ ΔΙΑΛΥΜΑΤΑ ΜΕ ΤΕΧΝΙΚΕΣ ΕΠΙΠΛΕΥΣΗΣ. (Thesis). Αριστοτέλειο Πανεπιστήμιο Θεσσαλονίκης (ΑΠΘ); Aristotle University Of Thessaloniki (AUTH). Retrieved from http://hdl.handle.net/10442/hedi/1804
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
ΛΑΖΑΡΙΔΗΣ, ΝΙΚΟΛΑΟΣ. “ΕΚΛΕΚΤΙΚΗ ΑΠΟΜΑΚΡΥΝΣΗ ΙΟΝΤΩΝ ΧΑΛΚΟΥ, ΨΕΥΔΑΡΓΥΡΟΥ ΚΑΙ ΑΡΣΕΝΙΚΟΥ ΑΠΟ ΥΔΑΤΙΚΑ ΔΙΑΛΥΜΑΤΑ ΜΕ ΤΕΧΝΙΚΕΣ ΕΠΙΠΛΕΥΣΗΣ.” 1991. Thesis, Αριστοτέλειο Πανεπιστήμιο Θεσσαλονίκης (ΑΠΘ); Aristotle University Of Thessaloniki (AUTH). Accessed January 20, 2021.
http://hdl.handle.net/10442/hedi/1804.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
ΛΑΖΑΡΙΔΗΣ, ΝΙΚΟΛΑΟΣ. “ΕΚΛΕΚΤΙΚΗ ΑΠΟΜΑΚΡΥΝΣΗ ΙΟΝΤΩΝ ΧΑΛΚΟΥ, ΨΕΥΔΑΡΓΥΡΟΥ ΚΑΙ ΑΡΣΕΝΙΚΟΥ ΑΠΟ ΥΔΑΤΙΚΑ ΔΙΑΛΥΜΑΤΑ ΜΕ ΤΕΧΝΙΚΕΣ ΕΠΙΠΛΕΥΣΗΣ.” 1991. Web. 20 Jan 2021.
Vancouver:
ΛΑΖΑΡΙΔΗΣ . ΕΚΛΕΚΤΙΚΗ ΑΠΟΜΑΚΡΥΝΣΗ ΙΟΝΤΩΝ ΧΑΛΚΟΥ, ΨΕΥΔΑΡΓΥΡΟΥ ΚΑΙ ΑΡΣΕΝΙΚΟΥ ΑΠΟ ΥΔΑΤΙΚΑ ΔΙΑΛΥΜΑΤΑ ΜΕ ΤΕΧΝΙΚΕΣ ΕΠΙΠΛΕΥΣΗΣ. [Internet] [Thesis]. Αριστοτέλειο Πανεπιστήμιο Θεσσαλονίκης (ΑΠΘ); Aristotle University Of Thessaloniki (AUTH); 1991. [cited 2021 Jan 20].
Available from: http://hdl.handle.net/10442/hedi/1804.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
ΛΑΖΑΡΙΔΗΣ . ΕΚΛΕΚΤΙΚΗ ΑΠΟΜΑΚΡΥΝΣΗ ΙΟΝΤΩΝ ΧΑΛΚΟΥ, ΨΕΥΔΑΡΓΥΡΟΥ ΚΑΙ ΑΡΣΕΝΙΚΟΥ ΑΠΟ ΥΔΑΤΙΚΑ ΔΙΑΛΥΜΑΤΑ ΜΕ ΤΕΧΝΙΚΕΣ ΕΠΙΠΛΕΥΣΗΣ. [Thesis]. Αριστοτέλειο Πανεπιστήμιο Θεσσαλονίκης (ΑΠΘ); Aristotle University Of Thessaloniki (AUTH); 1991. Available from: http://hdl.handle.net/10442/hedi/1804
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
5.
ΜΑΛΛΙΑΡΗΣ, ΔΗΜΟΣΘΕΝΗΣ.
ΣΥΜΒΟΛΗ ΣΤΟΝ ΕΜΠΛΟΥΤΙΣΜΟ ΧΡΩΜΙΤΗ ΜΕ ΤΗ ΜΕΘΟΔΟ ΤΗΣ ΕΠΙΠΛΕΥΣΗΣ.
Degree: 1992, Εθνικό Μετσόβιο Πολυτεχνείο (ΕΜΠ); National Technical University of Athens (NTUA)
URL: http://hdl.handle.net/10442/hedi/2132
► THE OBJECTIVES OF THE RESEARCH WERE: 1. THE DETERMINATION OF AN ORIGINAL FLOTATION REAGENT COMBINATION FOR THE EFFICIENT RECOVERY OF THE GREEK CHROMITES FROM VOURINOS-KOZANI…
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▼ THE OBJECTIVES OF THE RESEARCH WERE: 1. THE DETERMINATION OF AN ORIGINAL FLOTATION REAGENT COMBINATION FOR THE EFFICIENT RECOVERY OF THE GREEK CHROMITES FROM VOURINOS-KOZANI AREA. 2. THE QUALITATIVE AND QUANTITATIVE OPTIMIZATION OF THE ABOVE PROCESSING FLOW SHEET CONDITIONS. 3. THE STUDY OF THE MECHANISM OF ACTION OF FLOTATION REAGENTS. MORE THAN 40 FLOTATION REAGENTS WERE TESTED. THE ACTION OF NA2SIO3, NAOH, C.M.C., TITRIPLEX AND TALL OIL WAS STUDIED. THE COMBINATION OF THE ABOVE REAGENTS RESULTED IN THE OPTIMUM RECOVERY OF FLOTATION. THE RESULTSOF THE PROCESS WERE EXCELLENT IN THE CHROMITES WITH SERPERTINE GAUGUES BUT MEDIUM IN THE CHROMITES WITH OLIVINE GAUGUES.
Ο ΣΚΟΠΟΣ ΤΗΣ ΕΡΕΥΝΑΣ ΗΤΑΝ: 1. Ο ΠΡΟΣΔΙΟΡΙΣΜΟΣ ΠΡΩΤΟΤΥΠΟΥ ΣΥΝΔΥΑΣΜΟΥ ΑΝΤΙΔΡΑΣΤΗΡΙΩΝ ΕΠΙΠΛΕΥΣΗΣ ΤΩΝ ΕΛΛΗΝΙΚΩΝ ΧΡΩΜΙΤΩΝ ΤΗΣ ΠΕΡΙΟΧΗΣ ΒΟΥΡΙΝΟΥ ΚΟΖΑΝΗΣ. 2. Η ΑΡΙΣΤΟΠΟΙΗΣΗ ΤΩΝ ΣΥΝΘΗΚΩΝ ΤΗΣ ΠΑΡΑΠΑΝΩ ΜΕΘΟΔΟΛΟΓΙΑΣ. 3. Η ΔΙΕΡΕΥΝΗΣΗ ΤΟΥ ΜΗΧΑΝΙΣΜΟΥ ΔΡΑΣΗΣ ΤΩΝ ΠΑΡΑΠΑΝΩ ΑΝΤΙΔΡΑΣΤΗΡΙΩΝ. ΕΞΕΤΑΣΘΗΚΑΝ ΠΑΝΩ ΑΠΟ 40 ΑΝΤΙΔΡΑΣΤΗΡΙΑ ΕΠΙΠΛΕΥΣΗΣ. ΜΕΛΕΤΗΘΗΚΕ ΣΕ ΒΑΘΟΣ Η ΕΠΙΔΡΑΣΗ ΤΩΝ ΑΝΤΙΔΡΑΣΤΗΡΙΩΝ ΤΟΥ ΠΥΡΙΤΙΚΟΥ ΝΑΤΡΙΟΥ,ΤΟΥ TI-TRIPLEX, ΤΟΥ C.M.C., ΤΟΥ ΚΑΥΣΤΙΚΟΥ ΝΑΤΡΙΟΥ ΚΑΙ ΤΟΥ ΛΙΠΑΡΟΥ ΟΞΕΟΣ, ΚΑΘ'ΟΤΙ Ο ΣΥΝΔΥΑΣΜΟΣ ΤΩΝ ΠΑΡΑΠΑΝΩ ΑΝΤΙΔΡΑΣΤΗΡΙΩΝ ΑΠΕΔΩΣΕ ΤΑ ΚΑΛΥΤΕΡΑ ΑΠΟΤΕΛΕΣΜΑΤΑ. ΤΑ ΑΠΟΤΕΛΕΣΜΑΤΑ ΤΗΣ ΕΠΙΠΛΕΥΣΗΣ ΗΤΑΝ ΑΡΙΣΤΑ ΣΤΟΥΣ ΣΕΡΠΕΝΤΙΝΙΟΥΧΟΥΣ ΧΡΩΜΙΤΕΣ ΚΑΙ ΜΕΤΡΙΑ ΣΤΟΥΣ ΟΛΙΒΙΝΟΥΧΟΥΣ ΧΡΩΜΙΤΕΣ.
Subjects/Keywords: ANIONIC FLOTATION; CHELATION OF CATIONS; Dispersion; NEUTRALIZATION OF CATIONS; SELECTIVE FLOCCULATION; ΑΝΙΟΝΙΚΗ ΕΠΙΠΛΕΥΣΗ; Διασπορά; ΕΚΛΕΚΤΙΚΗ ΣΥΣΣΩΜΑΤΩΣΗ; ΕΞΟΥΔΕΤΕΡΩΣΗ ΚΑΤΙΟΝΤΩΝ; ΣΥΜΠΛΟΚΟΠΟΙΗΣΗ ΚΑΤΙΟΝΤΩΝ
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APA (6th Edition):
ΜΑΛΛΙΑΡΗΣ, . (1992). ΣΥΜΒΟΛΗ ΣΤΟΝ ΕΜΠΛΟΥΤΙΣΜΟ ΧΡΩΜΙΤΗ ΜΕ ΤΗ ΜΕΘΟΔΟ ΤΗΣ ΕΠΙΠΛΕΥΣΗΣ. (Thesis). Εθνικό Μετσόβιο Πολυτεχνείο (ΕΜΠ); National Technical University of Athens (NTUA). Retrieved from http://hdl.handle.net/10442/hedi/2132
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
ΜΑΛΛΙΑΡΗΣ, ΔΗΜΟΣΘΕΝΗΣ. “ΣΥΜΒΟΛΗ ΣΤΟΝ ΕΜΠΛΟΥΤΙΣΜΟ ΧΡΩΜΙΤΗ ΜΕ ΤΗ ΜΕΘΟΔΟ ΤΗΣ ΕΠΙΠΛΕΥΣΗΣ.” 1992. Thesis, Εθνικό Μετσόβιο Πολυτεχνείο (ΕΜΠ); National Technical University of Athens (NTUA). Accessed January 20, 2021.
http://hdl.handle.net/10442/hedi/2132.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
ΜΑΛΛΙΑΡΗΣ, ΔΗΜΟΣΘΕΝΗΣ. “ΣΥΜΒΟΛΗ ΣΤΟΝ ΕΜΠΛΟΥΤΙΣΜΟ ΧΡΩΜΙΤΗ ΜΕ ΤΗ ΜΕΘΟΔΟ ΤΗΣ ΕΠΙΠΛΕΥΣΗΣ.” 1992. Web. 20 Jan 2021.
Vancouver:
ΜΑΛΛΙΑΡΗΣ . ΣΥΜΒΟΛΗ ΣΤΟΝ ΕΜΠΛΟΥΤΙΣΜΟ ΧΡΩΜΙΤΗ ΜΕ ΤΗ ΜΕΘΟΔΟ ΤΗΣ ΕΠΙΠΛΕΥΣΗΣ. [Internet] [Thesis]. Εθνικό Μετσόβιο Πολυτεχνείο (ΕΜΠ); National Technical University of Athens (NTUA); 1992. [cited 2021 Jan 20].
Available from: http://hdl.handle.net/10442/hedi/2132.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
ΜΑΛΛΙΑΡΗΣ . ΣΥΜΒΟΛΗ ΣΤΟΝ ΕΜΠΛΟΥΤΙΣΜΟ ΧΡΩΜΙΤΗ ΜΕ ΤΗ ΜΕΘΟΔΟ ΤΗΣ ΕΠΙΠΛΕΥΣΗΣ. [Thesis]. Εθνικό Μετσόβιο Πολυτεχνείο (ΕΜΠ); National Technical University of Athens (NTUA); 1992. Available from: http://hdl.handle.net/10442/hedi/2132
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Virginia Tech
6.
Yildirim, Ismail.
Surface Free Energy Characterization of Powders.
Degree: PhD, Mining and Minerals Engineering, 2001, Virginia Tech
URL: http://hdl.handle.net/10919/27525
► Microcalorimetric measurements and contact angle measurements were conducted to study the surface chemistry of powdered minerals. The contact angle measurements were conducted on both flat…
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▼ Microcalorimetric measurements and contact angle measurements were conducted to study the surface chemistry of powdered minerals. The contact angle measurements were conducted on both flat and powdered talc samples, and the results were used to determine the surface free energy components using Van Oss-Chaudhury-Good (OCG) equation. It was found that the surface hydrophobicity of talc increases with decreasing particle size. At the same time, both the Lifshitz-van der Waals (gSLW) and the Lewis acid-base (gSAB) components (and, hence, the total surface free energy (gS)) decrease with decreasing particle size. The increase in the surface hydrophobicity and the decrease in surface free energy (gS) can be attributed to preferential breakage of the mineral along the basal plane, resulting in the exposure of more basal plane surfaces to the aqueous phase.
Heats of immersion measurements were conducted using a flow microcalorimeter on a number of powdered talc samples. The results were then used to calculate the contact angles using a rigorous thermodynamic relation. The measured heat of immersion values in water and calculated contact angles showed that the surface hydrophobicity of talc samples increase with decreasing particle size, which agrees with the direct contact angle measurements. A relationship between advancing water contact angle qa, and the heat of immersion (-DHi) and surface free energies was established. It was found that the value of -DHi decrease as qa increases.
The microcalorimetric and direct contact angle measurements showed that acid-base interactions play a crucial role in the interaction between talc and liquid. Using the Van Oss-Chaudhury-Goodâ s surface free energy components model, various talc powders were characterized in terms of their acidic and basic properties. It was found that the magnitude of the Lewis electron donor, gS-, and the Lewis electron acceptor, gS+, components of surface free energy is directly related to the particle size. The gS- of talc surface increased with decreasing particle size, while the gS+ slightly decreased. It was also found that the Lewis electron-donor component on talc surface is much higher than the Lewis electron-acceptor component, suggesting that the basal surface of talc is basic.
The heats of adsorption of butanol on various talc samples from n-heptane solution were also determined using a flow microcalorimeter. The heats of adsorption values were used to estimate % hydrophilicity and hydrophobicity and the areal ratios of the various talc samples. In addition, contact angle and heat of butanol adsorption measurements were conducted on a run-of-mine talc sample that has been ground to two different particle size fractions, i.e., d50=12.5 mm and d50=3.0 mm, respectively. The results were used to estimate the surface free energy components at the basal and edge surfaces of talc. It was found that the total surface free energy (gS) at the basal plane surface of talc is much lower than the total surface free energy at the edge surface. …
Advisors/Committee Members: Yoon, Roe-Hoan (committeechair), Luttrell, Gerald H. (committee member), Adel, Gregory T. (committee member), Jordan, J. L. (committee member), Wightman, James P. (committee member).
Subjects/Keywords: Hysterisis; Contact angle; Edge surface; Basal surface; Surface free energy; Microcalorimeter; Aspect ratio; Areal ratio; Anatase; Selective flocculation; Hydroxamates; Hydrophobicity; Polymer flocculant; Kaolin; Immersion; Acidity; Flotation; Adsorption; Basicity; Interfacial surface tension; Talc; Apolar; Polar; Equilibrium spreading pressure
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Record Details
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❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Yildirim, I. (2001). Surface Free Energy Characterization of Powders. (Doctoral Dissertation). Virginia Tech. Retrieved from http://hdl.handle.net/10919/27525
Chicago Manual of Style (16th Edition):
Yildirim, Ismail. “Surface Free Energy Characterization of Powders.” 2001. Doctoral Dissertation, Virginia Tech. Accessed January 20, 2021.
http://hdl.handle.net/10919/27525.
MLA Handbook (7th Edition):
Yildirim, Ismail. “Surface Free Energy Characterization of Powders.” 2001. Web. 20 Jan 2021.
Vancouver:
Yildirim I. Surface Free Energy Characterization of Powders. [Internet] [Doctoral dissertation]. Virginia Tech; 2001. [cited 2021 Jan 20].
Available from: http://hdl.handle.net/10919/27525.
Council of Science Editors:
Yildirim I. Surface Free Energy Characterization of Powders. [Doctoral Dissertation]. Virginia Tech; 2001. Available from: http://hdl.handle.net/10919/27525
.