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Publications (10 of 15) Show all publications
Karlkvist, T. (2017). Selectivity in Calcium mineral flotation - An analysis of novel an existing approaches. (Doctoral dissertation). Luleå University of Technology
Open this publication in new window or tab >>Selectivity in Calcium mineral flotation - An analysis of novel an existing approaches
2017 (English)Doctoral thesis, comprehensive summary (Other academic)
Alternative title[sv]
Selektivitet vid flotation av Kalciummineral - En analys av nya och existerande tillvägagångssätt
Place, publisher, year, edition, pages
Luleå University of Technology, 2017
Series
Doctoral thesis / Luleå University of Technology 1 jan 1997 → …, ISSN 1402-1544
Keywords
Froth flotation, Mineral processing, Adsorption, Mineral specific reagents, surfactant
National Category
Mineral and Mine Engineering
Research subject
Mineral Processing
Identifiers
urn:nbn:se:ltu:diva-63132 (URN)978-91-7583-914-1 (ISBN)978-91-7583-915-8 (ISBN)
Public defence
2017-06-20, F531, 14:11 (English)
Opponent
Supervisors
Available from: 2017-05-16 Created: 2017-05-16 Last updated: 2018-03-01Bibliographically approved
Rosenkranz, J. & Karlkvist, T. (Eds.). (2016). Conference in Minerals Engineering 2016 (ed.). Paper presented at . Luleå: Luleå tekniska universitet
Open this publication in new window or tab >>Conference in Minerals Engineering 2016
2016 (English)Collection (editor) (Other academic)
Place, publisher, year, edition, pages
Luleå: Luleå tekniska universitet, 2016
National Category
Metallurgy and Metallic Materials
Research subject
Mineral Processing
Identifiers
urn:nbn:se:ltu:diva-21706 (URN)c608c892-4fa0-447b-951e-5ea3319c4cef (Local ID)c608c892-4fa0-447b-951e-5ea3319c4cef (Archive number)c608c892-4fa0-447b-951e-5ea3319c4cef (OAI)
Note
Godkänd; 2016; 20160315 (janros)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-03-01Bibliographically approved
Karlkvist, T., Patra, A., Bordes, R., Holmberg, K. & Rao, H. (2016). Flotation selectivity of novel alkyl dicarboxylate reagents for calcite-fluorite separation (ed.). Tenside Surfactants Detergents, 53(6), 516-523
Open this publication in new window or tab >>Flotation selectivity of novel alkyl dicarboxylate reagents for calcite-fluorite separation
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2016 (English)In: Tenside Surfactants Detergents, ISSN 0932-3414, E-ISSN 2195-8564, Vol. 53, no 6, p. 516-523Article in journal (Refereed) Published
Abstract [en]

A series of amino acid-based surfactants with a fixed alkyl chain length and with two carboxyl groups separated by a spacer of one, two or three carbon atoms have been synthesized and evaluated as potential collectors for flotation of calcite and fluorite. A monocarboxylate amino acid-based surfactant having the same length of the hydrocarbon tail was also included in the study. Experiments using a Hallimond flotation tube showed that although the flotation reagents solely differs in terms of spacer, their efficacy in terms of flotation recovery varied very much. Whereas on calcite at pH 10.5 only the monocarboxylate collector gave a high yield, on fluorite at the same pH both the monocarboxylate and the dicarboxylate collectors with one carbon between the carboxyl groups gave good results. On calcite at the natural pH the monocarboxylate collector was most efficient but the dicarboxylate collectors with a two- and a three-carbon spacer also gave a reasonable recovery. On fluorite at the natural pH the dicarboxylate collectors with a two- and a three-carbon spacer were most efficient. The potential and the flotation recovery of the mineral particles as afunction of added collector was assessed and the adsorption was also monitored by diffuse reflectance infra-red spectroscopy. Taken together, the results showed that small changes in the head group region of the collector can radically affect flotation recovery. This type of knowledge is important to understand flotation selectivity in a mixture of similar minerals.

National Category
Metallurgy and Metallic Materials
Research subject
Mineral Processing; Future mining (AERI)
Identifiers
urn:nbn:se:ltu:diva-7761 (URN)10.3139/113.110471 (DOI)000388868300001 ()2-s2.0-84997683955 (Scopus ID)62cb80ee-2701-4146-bbac-57a22fff99fa (Local ID)62cb80ee-2701-4146-bbac-57a22fff99fa (Archive number)62cb80ee-2701-4146-bbac-57a22fff99fa (OAI)
Note

Validerad; 2017; Nivå 2; 2016-12-19 (andbra)

Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved
Karlkvist, T., Pålsson, B., Fredriksson, A. & Rao, H. (2016). Novel alkyl aminodicarboxylate reagents for mineral specific flotation (ed.). In: (Ed.), 2016 SME Annual Conference and Expo: The Future for Mining in a Data-Driven World, Phoenix, United States, 21 - 24 February 2016. Paper presented at SME Annual Conference & Expo : 21/02/2016 - 24/02/2016 (pp. 807-810). New York: Society for Mining, Metalurgy and Exploration
Open this publication in new window or tab >>Novel alkyl aminodicarboxylate reagents for mineral specific flotation
2016 (English)In: 2016 SME Annual Conference and Expo: The Future for Mining in a Data-Driven World, Phoenix, United States, 21 - 24 February 2016, New York: Society for Mining, Metalurgy and Exploration, 2016, p. 807-810Conference paper, Published paper (Refereed)
Abstract [en]

Separation of different calcium minerals have long been an interesting and challenging problem. In this investigation calcium mineral separation is examined by: microflotation, zeta potential measurement and adsorption, using novel collectors having two functional groups instead of one. In theory, by varying the distance between the functional groups, it could be possible to preferentially target one calcium mineral by matching the spatial distance between the sites on the mineral surface. In this investigation two new surfactants have been tested to estimate their ability to float apatite and/or calcite.Preliminary findings show that an increase in distance between the functional groups favors one mineral over the other, and this might be due to differences in the mineral surface structure.

Place, publisher, year, edition, pages
New York: Society for Mining, Metalurgy and Exploration, 2016
National Category
Metallurgy and Metallic Materials
Research subject
Mineral Processing; Future mining (AERI)
Identifiers
urn:nbn:se:ltu:diva-27903 (URN)2-s2.0-84988442693 (Scopus ID)17bc58cd-af11-42cb-bd7b-4192ff4d6ee4 (Local ID)9781510825659 (ISBN)17bc58cd-af11-42cb-bd7b-4192ff4d6ee4 (Archive number)17bc58cd-af11-42cb-bd7b-4192ff4d6ee4 (OAI)
Conference
SME Annual Conference & Expo : 21/02/2016 - 24/02/2016
Note

Godkänd; 2015; 20160614 (palle)

Available from: 2016-09-30 Created: 2016-09-30 Last updated: 2018-03-01Bibliographically approved
Rosenkranz, J. & Karlkvist, T. (Eds.). (2015). Conference in Minerals Engineering 2015 (ed.). Paper presented at . Luleå: Luleå tekniska universitet
Open this publication in new window or tab >>Conference in Minerals Engineering 2015
2015 (English)Collection (editor) (Other academic)
Place, publisher, year, edition, pages
Luleå: Luleå tekniska universitet, 2015
National Category
Metallurgy and Metallic Materials
Research subject
Mineral Processing
Identifiers
urn:nbn:se:ltu:diva-21717 (URN)d1ae94f7-6fdf-4584-b2d7-53e8091ce932 (Local ID)d1ae94f7-6fdf-4584-b2d7-53e8091ce932 (Archive number)d1ae94f7-6fdf-4584-b2d7-53e8091ce932 (OAI)
Note
Godkänd; 2015; 20150616 (janros)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-03-01Bibliographically approved
Karlkvist, T., Patra, A., Kota, H. R., Bordes, R. & Holmberg, K. (2015). Flotation selectivity of novel alkyl dicarboxylate reagents for apatite-calcite separation (ed.). Journal of Colloid and Interface Science, 445, 40-47
Open this publication in new window or tab >>Flotation selectivity of novel alkyl dicarboxylate reagents for apatite-calcite separation
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2015 (English)In: Journal of Colloid and Interface Science, ISSN 0021-9797, E-ISSN 1095-7103, Vol. 445, p. 40-47Article in journal (Refereed) Published
Abstract [en]

The investigation aims to demonstrate the conceptual thoughts behind developing mineral specific reagents for use in flotation of calcium containing ores. For this purpose, a series of dicarboxylate-based surfactants with varying distance between the carboxylate groups (one, two or three methylene groups) was synthesized. A surfactant with the same alkyl chain length but with only one carboxylate group was also synthesized and evaluated. The adsorption behavior of these new reagents on pure apatite and pure calcite surfaces was studied using Hallimond tube flotation, FTIR and ζ potential measurements. The relation between the adsorption behavior of a given surfactant at a specific mineral surface and its molecular structure over a range of concentrations and pH values, as well as the region of maximum recovery, was established. It was found that one of the reagents, with a specific distance between the carboxylate groups, was much more selective for a particular mineral surface than the other homologues. For example, out of the four compounds synthesized, only the one where the carboxylate groups were separated by a single methylene group floated apatite but not calcite, whereas calcite was efficiently floated with the monocarboxylic reagent, but not with the other reagents synthesized. This selective adsorption of a given surfactant to a particular mineral surface relative to other mineral surfaces as evidenced in the flotation studies was substantiated by ζ potential and infra-red spectroscopy data

National Category
Metallurgy and Metallic Materials
Research subject
Mineral Processing
Identifiers
urn:nbn:se:ltu:diva-10025 (URN)10.1016/j.jcis.2014.11.072 (DOI)000350006700006 ()25596367 (PubMedID)2-s2.0-84921051820 (Scopus ID)8c78bb41-0a29-4bee-b260-10091965f006 (Local ID)8c78bb41-0a29-4bee-b260-10091965f006 (Archive number)8c78bb41-0a29-4bee-b260-10091965f006 (OAI)
Note

Validerad; 2015; Nivå 2; 20141205 (andbra)

Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved
Rosenkranz, J. & Karlkvist, T. (Eds.). (2014). Conference in Minerals Engineering 2014 (ed.). Paper presented at . Luleå: Luleå tekniska universitet
Open this publication in new window or tab >>Conference in Minerals Engineering 2014
2014 (English)Collection (editor) (Other academic)
Place, publisher, year, edition, pages
Luleå: Luleå tekniska universitet, 2014
National Category
Metallurgy and Metallic Materials
Research subject
Mineral Processing
Identifiers
urn:nbn:se:ltu:diva-21694 (URN)b674f856-e9fb-4244-b8d0-3445207e0fa0 (Local ID)b674f856-e9fb-4244-b8d0-3445207e0fa0 (Archive number)b674f856-e9fb-4244-b8d0-3445207e0fa0 (OAI)
Note
Godkänd; 2014; 20140414 (janros)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-03-01Bibliographically approved
Karlkvist, T. (2014). Design and Development of Mineral Structure Specific Collectors in Flotation (ed.). (Licentiate dissertation). Paper presented at . Luleå: Luleå tekniska universitet
Open this publication in new window or tab >>Design and Development of Mineral Structure Specific Collectors in Flotation
2014 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

The success of mineral flotation processes depends on the hydrophobization of the surface for the desired mineral particles whilst keeping, or making, all other minerals hydrophilic. This is achieved by adding several reagents to the flotation pulp to adsorb selectively at the mineral/water interface. The reagents (surface active agents) which selectively adsorbs on minerals to be floated are called collectors. It is realized that many of these commonly used reagents are highly toxic and often potential threats to the environment. Use of many of theseconventional chemicals will therefore be restricted soon and must eventually be stopped. An immediate effort is necessary to develop alternative eco-friendly reagents in order to continue to extract valuable minerals from ores. In addition, with the steady depletion of high grade, relatively easy to process ores, the mineral industry is confronted with a challenging task of finding more efficient techniques so as to exploit low grade, complex and disseminated typeof ore deposits and old tailing dumps. The development of new selective and environmentally acceptable substances containing almost tailor-made reagents is thus inevitable for sustainability. Several known chelating agents have been appropriately modified to make those behave as selective flotation collectors with some degree of success. The problem is that almost all of the chelating groups form complexes with almost all of the transition and many non-transition metals. As a consequence, absolute selectivity does not exist. Besides beingunsatisfactory from a scientific viewpoint, it assumes that the metal ion specificity observed for a functional group in bulk aqueous system would remain valid during surface chelation at the interface, while in actual practice, the specificity based on metal ion is neither valid nor useful where the cations participating in the complexation reactions are the same, for example separation among the calcium minerals.It is clear that a selective reagent should be based on the reagent interactions not merely with the metal ion on the surface, but with the whole surface. It is more appropriate to design reagents having functional groups so spaced that those are compatible with the relative positions of the metal ion sites available on the surface, that is, to design not just metalspecificbut structure-specific reagents. The understandings of molecular interactions involved in the recognition of surfaces by organic molecules in biomineralization process suggest the possibility of reagents specific to the crystal structure. These understandings have been successfully applied to the rational design and synthesis of molecules either for the control of crystal morphology or to inhibitcrystal growth processes through the recognition of specific crystal surfaces. The idea of molecules consisting of two groups having appropriate spacing between them to achieve structural compatibility during interaction with surface exhibit structure-specificity is of direct relevance to the reagents selectivity in flotation processes. The present investigation aims to develop and distinguish mineral specific reagents with two functional groups for use in flotation of calcium containing minerals. For this purpose, a series of dicarboxylate-based surfactants with varying spacing between the carboxylate groups (one, two or three methylene groups) were synthesized. As reference, a surfactant withthe same alkyl chain length but with only one carboxylate group in the polar part was synthesized. The adsorption behavior of these new reagents on pure apatite, calcite and fluorite mineral surfaces was studied using Hallimond tube flotation, ζ-potential and FTIR measurements. The relation between the adsorption behavior of a given surfactant on a specific mineral surface and its molecular structure over a range of concentration and pH values, as well as the region of maximum recovery were established. It was found that one of the reagents, with a specific distance between the carboxylate groups, was much moreselective for a particular mineral surface than the other homologues synthesized. This selective adsorption of a given surfactant to a particular mineral surface relative to other mineral surfaces as evidenced in flotation studies is substantiated by ζ-potential and infrared spectroscopy data. Our investigation revealed that it is possible to design and develop mineral specific reagents in flotation.

Place, publisher, year, edition, pages
Luleå: Luleå tekniska universitet, 2014
Series
Licentiate thesis / Luleå University of Technology, ISSN 1402-1757
National Category
Metallurgy and Metallic Materials
Research subject
Mineral Processing
Identifiers
urn:nbn:se:ltu:diva-18421 (URN)88b97431-ae2b-426e-b82d-8bf62bfca6ae (Local ID)978-91-7439-949-3 (ISBN)978-91-7439-950-9 (ISBN)88b97431-ae2b-426e-b82d-8bf62bfca6ae (Archive number)88b97431-ae2b-426e-b82d-8bf62bfca6ae (OAI)
Note
Godkänd; 2014; 20140430 (andbra); Nedanstående person kommer att hålla licentiatseminarium för avläggande av teknologie licentiatexamen. Namn: Tommy Karlkvist Ämne: Mineralteknik/Mineral Processing Uppsats: Design and Development of Mineral Structure Specific Collectors in Flotation Examinator: Professor Kota Hanumantha Rao, Institutionen för samhällsbyggnad och naturresurser, Luleå tekniska universitet Diskutant: PhD, Principal Scientist Beena Rai, Tata Research Development and Design Centre, Pune, India Tid: Fredag den 13 juni 2014 kl 10.00 Plats: F531, Luleå tekniska universitetAvailable from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-03-01Bibliographically approved
Patra, A., Karlkvist, T., Rao, H., Fredriksson, A., Bordes, R. & Holmberg, K. (2014). Design and development of novel mineral-specific collectors for flotation (ed.). Paper presented at International Mineral Processing Congress : 20/10/2014 - 24/10/2014. Paper presented at International Mineral Processing Congress : 20/10/2014 - 24/10/2014.
Open this publication in new window or tab >>Design and development of novel mineral-specific collectors for flotation
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2014 (English)Conference paper, Oral presentation only (Refereed)
Abstract [en]

Almost all of the flotation reagents used today were discovered by continued application of empirical methods and/or trial and error experimentation. Moreover, with the metal-ion specific approach used so far, it is difficult to separate the minerals containing the same constituent metal ion. A critical assessment of molecular recognition processes involved in biomineralization suggested the possibility of using reagents which are surface specific. The concept that the molecules consisting of two or more functional groups having appropriate spacing between those so as to achieve structural/stereochemical compatibility during interaction with the mineral surface exhibit structure-specificity is thought to be extended to the design of specific collectors in flotation processes. In the present study, for the first time, a rational design of surface active molecules, and thereby the recognition of crystal faces (of minerals) by these molecules through structural and stereochemical matching is being utilized successfully to selectively float various minerals. For this purpose, carboxylate-based collectors (for mineral specific flotation of calcium minerals) as well as xanthate-based collectors (for mineral specific flotation of sulphide minerals) with a fixed alkyl chain length but having two functional groups with varying geometrical distances (separated by a spacer of one, two and three carbon atoms) between them have been synthesized. In this article, we have discussed the design, synthesis, purification of these novel mineral specific collectors as well as their important solution parameters in relation to flotation processes.

National Category
Physical Chemistry Metallurgy and Metallic Materials
Research subject
Chemistry of Interfaces; Mineral Processing
Identifiers
urn:nbn:se:ltu:diva-32389 (URN)6e1ec01b-f440-4b68-834f-f21ec913fd43 (Local ID)6e1ec01b-f440-4b68-834f-f21ec913fd43 (Archive number)6e1ec01b-f440-4b68-834f-f21ec913fd43 (OAI)
Conference
International Mineral Processing Congress : 20/10/2014 - 24/10/2014
Note
Godkänd; 2014; 20150824 (andbra)Available from: 2016-09-30 Created: 2016-09-30 Last updated: 2018-04-16Bibliographically approved
Karlkvist, T., Patra, A., Rao, H., Bordes, R., Holmberg, K. & Fredriksson, A. (2014). Molecular recognition in mineral flotation: Selectivity in apatite-calcite system (ed.). Paper presented at International Mineral Processing Congress : 20/10/2014 - 24/10/2014. Paper presented at International Mineral Processing Congress : 20/10/2014 - 24/10/2014.
Open this publication in new window or tab >>Molecular recognition in mineral flotation: Selectivity in apatite-calcite system
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2014 (English)Conference paper, Oral presentation only (Refereed)
Abstract [en]

The present investigation aims to develop and distinguish mineral specific reagents with two functional groups for use in flotation of calcium containing minerals. For this purpose, a series of dicarboxylate-based surfactants with varying length between the carboxylate groups (one, two or three methylene groups) were synthesized. As reference, a surfactant with the same alkyl chain length but with only one carboxylate group in the polar part was synthesized. The adsorption behavior of these new reagents on pure apatite and calcite mineral surfaces was studied using Hallimond tube flotation, FTIR and ζ potential measurements. The relation between the adsorption behavior of a given surfactant on a specific mineral surface and its molecular structure over a range of concentration and pH values, as well as the region of maximum recovery were established. It was found that one of the reagents, with a specific distance between the carboxylate groups, was much more selective for a particular mineral surface than the other homologues synthesized. This selective adsorption of a given surfactant to a particular mineral surface relative to other mineral surfaces as evidenced in flotation studies is substantiated by ζ potential and infra-red spectroscopy data.

National Category
Physical Chemistry Metallurgy and Metallic Materials
Research subject
Chemistry of Interfaces; Mineral Processing
Identifiers
urn:nbn:se:ltu:diva-34992 (URN)84938844701 (Scopus ID)9556eee6-e2b7-4c8d-81e9-ae4ad6be9cbc (Local ID)9556eee6-e2b7-4c8d-81e9-ae4ad6be9cbc (Archive number)9556eee6-e2b7-4c8d-81e9-ae4ad6be9cbc (OAI)
Conference
International Mineral Processing Congress : 20/10/2014 - 24/10/2014
Note
Godkänd; 2014; 20150824 (andbra)Available from: 2016-09-30 Created: 2016-09-30 Last updated: 2018-04-16Bibliographically approved
Organisations
Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0002-7524-7767

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