The effect of chemical composition and molecular weight of polysaccharide depressants on the flotation of talc

Shortridge, P. G., Harris, P. J., Bradshaw, D. J. and Koopal, L. K. (2000) The effect of chemical composition and molecular weight of polysaccharide depressants on the flotation of talc. International Journal of Mineral Processing, 59 3: 215-224. doi:10.1016/S0301-7516(99)00077-0


Author Shortridge, P. G.
Harris, P. J.
Bradshaw, D. J.
Koopal, L. K.
Title The effect of chemical composition and molecular weight of polysaccharide depressants on the flotation of talc
Journal name International Journal of Mineral Processing   Check publisher's open access policy
ISSN 0301-7516
Publication date 2000
Year available 2000
Sub-type Article (original research)
DOI 10.1016/S0301-7516(99)00077-0
Open Access Status
Volume 59
Issue 3
Start page 215
End page 224
Total pages 10
Place of publication Amsterdam, The Netherlands
Publisher Elsevie
Collection year 2000
Language eng
Formatted abstract
Polysaccharide reagents are frequently used in the mineral processing industry to improve the grade of the concentrate by depressing the naturally floatable gangue. A microflotation study showed that at an ionic strength of 10(-3) M KNO3, the dosage, molecular weight, and chemical composition of polysaccharide depressants affect their depressing action on talc. Viscosity readings for four carboxymethylcellulose (CMC) reagents and three modified guar gum reagents are reported, and estimates of the molecular weight of the CMCs are calculated. The natural floatability of talc was diminished when guar-based polymers were added to the system. Moreover, the depression of talc was increased as the guar molecular weight was increased. Strong depression of talc was achieved at a relatively low guar dosage; higher dosages did not further increase this depression. At 10(-3) M KNO3, the CMCs were ineffective depressants of talc. No systematic change in talc depression for differing molecular weight CMCs was observed. A small increase in depression was observed when the concentration of CMC was increased. A mechanism is proposed for the polymer-talc interactions based on these preliminary studies and information from similar studies in literature
Keyword Depressants
Flotation
Talc
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Unknown

Document type: Journal Article
Sub-type: Article (original research)
Collection: Julius Kruttschnitt Mineral Research Centre Publications
 
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Created: Mon, 08 Dec 2014, 13:53:16 EST by Karen Holtham on behalf of Julius Kruttschnitt Mineral Research Centre