Flotation of monazite in the presence of calcite part I: Calcium ion effects on the adsorption of hydroxamic acid

W. Zhang; R. Q. Honaker; J. G. Groppo

doi:10.1016/j.mineng.2016.09.020

Flotation of monazite in the presence of calcite part I: Calcium ion effects on the adsorption of hydroxamic acid

W. Zhang, R. Q. Honaker, J. G. Groppo

Research output: Contribution to journal › Article › peer-review

118 Scopus citations

Abstract

The dissolution of minerals provides elevated concentrations of alkaline earth metal ions such as calcium (Ca²⁺) in water which may have a significant influence on flotation performance. The effects of Ca²⁺ ions dissolved from calcite surfaces on the flotation performance of a monazite-calcite system have been investigated using micro-flotation tests followed by fundamental collector adsorption studies. The results indicate that specially adsorbed CaOH⁺ via hydrogen bonding competed with hydroxamic acid for the phosphate-oxygen active sites on the monazite surface and decreased its hydrophobicity due to hydration. Electrostatically adsorbed CaOH⁺ on monazite increased the adsorption density of hydroxamic acid through a chelating interaction. At higher dosages of calcium and hydroxamic acid, bulk and surface precipitation of calcium-hydroxamate occurs in the monazite-calcium-hydroxamic acid system.

Original language	English
Pages (from-to)	40-48
Number of pages	9
Journal	Minerals Engineering
Volume	100
DOIs	https://doi.org/10.1016/j.mineng.2016.09.020
State	Published - Jan 1 2017

Bibliographical note

Publisher Copyright:
© 2016 Elsevier Ltd

Keywords

Calcite
Calcium ions
Flotation
Hydroxamic acid
Monazite

ASJC Scopus subject areas

Control and Systems Engineering
General Chemistry
Geotechnical Engineering and Engineering Geology
Mechanical Engineering

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10.1016/j.mineng.2016.09.020

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title = "Flotation of monazite in the presence of calcite part I: Calcium ion effects on the adsorption of hydroxamic acid",

abstract = "The dissolution of minerals provides elevated concentrations of alkaline earth metal ions such as calcium (Ca2+) in water which may have a significant influence on flotation performance. The effects of Ca2+ ions dissolved from calcite surfaces on the flotation performance of a monazite-calcite system have been investigated using micro-flotation tests followed by fundamental collector adsorption studies. The results indicate that specially adsorbed CaOH+ via hydrogen bonding competed with hydroxamic acid for the phosphate-oxygen active sites on the monazite surface and decreased its hydrophobicity due to hydration. Electrostatically adsorbed CaOH+ on monazite increased the adsorption density of hydroxamic acid through a chelating interaction. At higher dosages of calcium and hydroxamic acid, bulk and surface precipitation of calcium-hydroxamate occurs in the monazite-calcium-hydroxamic acid system.",

keywords = "Calcite, Calcium ions, Flotation, Hydroxamic acid, Monazite",

author = "W. Zhang and Honaker, {R. Q.} and Groppo, {J. G.}",

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year = "2017",

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doi = "10.1016/j.mineng.2016.09.020",

language = "English",

volume = "100",

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T2 - Calcium ion effects on the adsorption of hydroxamic acid

AU - Zhang, W.

AU - Honaker, R. Q.

AU - Groppo, J. G.

PY - 2017/1/1

Y1 - 2017/1/1

N2 - The dissolution of minerals provides elevated concentrations of alkaline earth metal ions such as calcium (Ca2+) in water which may have a significant influence on flotation performance. The effects of Ca2+ ions dissolved from calcite surfaces on the flotation performance of a monazite-calcite system have been investigated using micro-flotation tests followed by fundamental collector adsorption studies. The results indicate that specially adsorbed CaOH+ via hydrogen bonding competed with hydroxamic acid for the phosphate-oxygen active sites on the monazite surface and decreased its hydrophobicity due to hydration. Electrostatically adsorbed CaOH+ on monazite increased the adsorption density of hydroxamic acid through a chelating interaction. At higher dosages of calcium and hydroxamic acid, bulk and surface precipitation of calcium-hydroxamate occurs in the monazite-calcium-hydroxamic acid system.

AB - The dissolution of minerals provides elevated concentrations of alkaline earth metal ions such as calcium (Ca2+) in water which may have a significant influence on flotation performance. The effects of Ca2+ ions dissolved from calcite surfaces on the flotation performance of a monazite-calcite system have been investigated using micro-flotation tests followed by fundamental collector adsorption studies. The results indicate that specially adsorbed CaOH+ via hydrogen bonding competed with hydroxamic acid for the phosphate-oxygen active sites on the monazite surface and decreased its hydrophobicity due to hydration. Electrostatically adsorbed CaOH+ on monazite increased the adsorption density of hydroxamic acid through a chelating interaction. At higher dosages of calcium and hydroxamic acid, bulk and surface precipitation of calcium-hydroxamate occurs in the monazite-calcium-hydroxamic acid system.

KW - Calcite

KW - Calcium ions

KW - Flotation

KW - Hydroxamic acid

KW - Monazite

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DO - 10.1016/j.mineng.2016.09.020

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VL - 100

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JO - Minerals Engineering

JF - Minerals Engineering

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Flotation of monazite in the presence of calcite part I: Calcium ion effects on the adsorption of hydroxamic acid

Abstract

Bibliographical note

Keywords

ASJC Scopus subject areas

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