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Selectivity in Calcium mineral flotation - An analysis of novel an existing approaches
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Minerals and Metallurgical Engineering. (Mineral Processing)
2017 (English)Doctoral thesis, comprehensive summary (Other academic)Alternative title
Selektivitet vid flotation av Kalciummineral - En analys av nya och existerande tillvägagångssätt (Swedish)
Place, publisher, year, edition, pages
Luleå University of Technology, 2017.
Series
Doctoral thesis / Luleå University of Technology 1 jan 1997 → …, ISSN 1402-1544
Keyword [en]
Froth flotation, Mineral processing, Adsorption, Mineral specific reagents, surfactant
National Category
Mineral and Mine Engineering
Research subject
Mineral Processing
Identifiers
URN: urn:nbn:se:ltu:diva-63132ISBN: 978-91-7583-914-1 (print)ISBN: 978-91-7583-915-8 (electronic)OAI: oai:DiVA.org:ltu-63132DiVA: diva2:1095897
Public defence
2017-06-20, F531, 14:11 (English)
Opponent
Supervisors
Available from: 2017-05-16 Created: 2017-05-16 Last updated: 2017-05-18Bibliographically approved
List of papers
1. Design and development of novel mineral-specific collectors for flotation
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, Presentation (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: 2017-05-16Bibliographically approved
2. Flotation selectivity of novel alkyl dicarboxylate reagents for apatite-calcite separation
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, 40-47 p.Article 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)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: 2017-05-16Bibliographically approved
3. Flotation selectivity of novel alkyl dicarboxylate reagents for calcite-fluorite separation
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, 516-523 p.Article 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: 2017-05-16Bibliographically approved
4. Novel alkyl aminodicarboxylate reagents for mineral specific flotation
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, 807-810 p.Conference 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: 2017-05-16Bibliographically approved
5. Synergism among collectors used for flotation of apatite and REE minerals
Open this publication in new window or tab >>Synergism among collectors used for flotation of apatite and REE minerals
(English)Manuscript (preprint) (Other academic)
National Category
Mineral and Mine Engineering
Research subject
Mineral Processing
Identifiers
urn:nbn:se:ltu:diva-63131 (URN)
Available from: 2017-04-24 Created: 2017-04-24 Last updated: 2017-05-16

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