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Hydrolysis of metallic ions in mineral processing circuits and its effect on flotation Laskowski, J. (Janusz), 1936-; Castro Flores, Sergio H.

Abstract

Hydrolysis of metallic ions depends on pH and the products of hydrolysis either activate flotation, can lead to inadvertent activation of gangue particles, but can also depress flotation of valuable components. One of the most recently studied topics is the use of seawater in flotation. Seawater is a concentrated NaCl solution (about 0,6 mole/L) that also contains considerable amount of Mg²⁺ and Ca²⁺ ions. The hydrolysis products of Mg²⁺ strongly depress flotation of molybdenite over the pH ranges over which they form in the process water. This effect can be eliminated by removal of hydrolysing ions from the process water or by carrying out the flotation at the pH over which such a hydrolysis can be avoided. The former can be exemplified by prior precipitation of the harmful hydrolysing ions as, for example, in the University of Concepcion Patent. The latter can be exemplified by the use of metabisulfite to depress pyrite in the flotation of Cu-Mo sulfide ores in seawater, the process that is carried out at much lower pH which avoids formation of Mg²⁺ hydrolysis products.

Item Metadata

Title
Hydrolysis of metallic ions in mineral processing circuits and its effect on flotation
Creator
Laskowski, J. (Janusz), 1936-; Castro Flores, Sergio H.
Contributor
Conference of Metallurgists (56th : 2017 : Vancouver, B.C.)
Date Issued
2017-04
Description
Hydrolysis of metallic ions depends on pH and the products of hydrolysis either activate flotation, can lead to inadvertent activation of gangue particles, but can also depress flotation of valuable components. One of the most recently studied topics is the use of seawater in flotation. Seawater is a concentrated NaCl solution (about 0,6 mole/L) that also contains considerable amount of Mg²⁺ and Ca²⁺ ions. The hydrolysis products of Mg²⁺ strongly depress flotation of molybdenite over the pH ranges over which they form in the process water. This effect can be eliminated by removal of hydrolysing ions from the process water or by carrying out the flotation at the pH over which such a hydrolysis can be avoided. The former can be exemplified by prior precipitation of the harmful hydrolysing ions as, for example, in the University of Concepcion Patent. The latter can be exemplified by the use of metabisulfite to depress pyrite in the flotation of Cu-Mo sulfide ores in seawater, the process that is carried out at much lower pH which avoids formation of Mg²⁺ hydrolysis products.
Subject
Activation; Adsorption; Depression; Flotation; Ion hydrolysis; Metallic ions; Seawater
Genre
Conference Paper
Type
Text
Language
eng
Date Available
2017-04-27
Provider
Vancouver : University of British Columbia Library
Rights
Attribution-NonCommercial-NoDerivatives 4.0 International
DOI
10.14288/1.0347200
URI
http://hdl.handle.net/2429/61397
Affiliation
Applied Science, Faculty of; Non UBC; Mining Engineering, Keevil Institute of
Peer Review Status
Unreviewed
Scholarly Level
Faculty
Rights URI
http://creativecommons.org/licenses/by-nc-nd/4.0/
Aggregated Source Repository
DSpace

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Attribution-NonCommercial-NoDerivatives 4.0 International