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The use of ToF-SIMS and microflotation to assess the reversibility of binding of CMC onto talc

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Title: The use of ToF-SIMS and microflotation to assess the reversibility of binding of CMC onto talc
Authors: Parolis, L.A.S.1 Lesley.Parolis@uct.ac.za, van der Merwe, R.1, van Leerdam, G.C.2, Prins, F.E.3, Smeink, R.G.3
Source: Minerals Engineering. Aug2007, Vol. 20 Issue 10, p970-978. 9p.
Subjects: Adsorption (Chemistry), Flotation, Separation (Technology), Solution (Chemistry)
Abstract: Abstract: Carboxymethyl cellulose (CMC) is commonly used as a depressant for talcaceous minerals. To assess whether CMC depressants are strongly, or weakly and reversibly bound to the surface of talc, desorption experiments were conducted on New York talc. The floatability was monitored through microflotation experiments, combined with the determination of the CMC coverage on talc by ToF-SIMS. CMC adsorption and desorption were carried out in distilled water and in electrolyte containing Ca2+ ions. CMC adsorption levels were higher using Ca2+ electrolyte, in line with the depression behavior in the microflotation tests. Washing did not affect the flotation behavior. ToF-SIMS showed that CMC coverage of the talc particles was good and the distribution homogeneous. Adsorption and subsequent desorption in distilled water however, showed a partially restored floatability after desorption, which could be related to an inhomogeneous CMC distribution on the talc surface as shown by ToF-SIMS. By additional exposure to Ca2+ ions CMC redistribution occurs causing depression. [Copyright &y& Elsevier]
Copyright of Minerals Engineering is the property of Pergamon Press - An Imprint of Elsevier Science and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
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DbLabel: Engineering Source
An: 25943145
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PubType: Academic Journal
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  Data: The use of ToF-SIMS and microflotation to assess the reversibility of binding of CMC onto talc
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  Data: <searchLink fieldCode="JN" term="%22Minerals+Engineering%22">Minerals Engineering</searchLink>. Aug2007, Vol. 20 Issue 10, p970-978. 9p.
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  Data: <searchLink fieldCode="DE" term="%22Adsorption+%28Chemistry%29%22">Adsorption (Chemistry)</searchLink><br /><searchLink fieldCode="DE" term="%22Flotation%22">Flotation</searchLink><br /><searchLink fieldCode="DE" term="%22Separation+%28Technology%29%22">Separation (Technology)</searchLink><br /><searchLink fieldCode="DE" term="%22Solution+%28Chemistry%29%22">Solution (Chemistry)</searchLink>
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  Data: Abstract: Carboxymethyl cellulose (CMC) is commonly used as a depressant for talcaceous minerals. To assess whether CMC depressants are strongly, or weakly and reversibly bound to the surface of talc, desorption experiments were conducted on New York talc. The floatability was monitored through microflotation experiments, combined with the determination of the CMC coverage on talc by ToF-SIMS. CMC adsorption and desorption were carried out in distilled water and in electrolyte containing Ca2+ ions. CMC adsorption levels were higher using Ca2+ electrolyte, in line with the depression behavior in the microflotation tests. Washing did not affect the flotation behavior. ToF-SIMS showed that CMC coverage of the talc particles was good and the distribution homogeneous. Adsorption and subsequent desorption in distilled water however, showed a partially restored floatability after desorption, which could be related to an inhomogeneous CMC distribution on the talc surface as shown by ToF-SIMS. By additional exposure to Ca2+ ions CMC redistribution occurs causing depression. [Copyright &y& Elsevier]
– Name: AbstractSuppliedCopyright
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  Data: <i>Copyright of Minerals Engineering is the property of Pergamon Press - An Imprint of Elsevier Science and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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