Effect of Seawater on Sulfide Ore Flotation: A Review

The flotation process in seawater is highly complex and multifaceted, wherein the chemistry is very different to that of pure water. The high saline environment compresses the electrical double layers resulting in (i) enhancement of the floatability for surfaces that are already hydrophobic; (ii) mi...

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Bibliographic Details
Published in:Mineral Processing and Extractive Metallurgy Review 2016-11, Vol.37 (6), p.369-384
Main Authors: Jeldres, Ricardo I., Forbes, Liza, Cisternas, Luis A.
Format: Article
Language:English
Subjects:
Coatings
Double layer
Flotation
Froth flotation
Reduction
review
Saline environments
Saline water
Sea water
Seawater
sulfide ores
Sulfides
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Summary:The flotation process in seawater is highly complex and multifaceted, wherein the chemistry is very different to that of pure water. The high saline environment compresses the electrical double layers resulting in (i) enhancement of the floatability for surfaces that are already hydrophobic; (ii) mitigation of the slime coatings; (iii) increase of the entrainment; (iv) reduction of the bubbles size; and (v) better froths stability. In parallel, the secondary ions present in seawater cause a colloidal precipitation and a strong buffering effect, which difficult the operation at high alkaline condition. The objective of this review is to present a summary of the current knowledge on the subject of seawater flotation processes, highlighting the copper sulphide ores flotation. This review includes a description of the underlying flotation mechanisms affected by the presence of saline water and seawater, as well as a more practical description of industrial flotation operations.
ISSN:0882-7508
1547-7401
DOI:10.1080/08827508.2016.1218871