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Electrochemical flotation of sulfides: chalcocite-ethylxanthate interactions.

Authors
Richardson-PE; Stout-JV III; Proctor-CL; Walker-GW
Source
Int J Miner Process 1984 Jan; 12(1-3):73-93
NIOSHTIC No.
10003346
Abstract
This paper discusses part of a U.S. Bureau of Mines research effort to use electrochemical techniques to control sulfide flotation with the aim of developing new methods to process low-grade, complex domestic ores. The interactions between chalcocite and ethylxanthate (EtX?) have been studied in an electrochemical-microflotation cell containing a packed bed of the mineral as a working electrode. Spectrophotometric and electrochemical techniques have shown that in the potential range ?0.7 to 0 V (SCE) at a pH of 9.2 there are at least four distinct reactions: (1) a reaction of EtX? to form ethylperxanthate at reducing potentials near ?0.5 V; (2) a reaction of EtX? with soluble Cu(II) at the open circuit potential (?0.028 V); (3) an exchange reaction whereby EtX? displaces an oxidation product; and (4) a charge transfer oxidation reaction. The exchange and charge transfer oxidation reactions occur over the same potential range (?0.5 to ?0.1 V) and are both believed to produce cuprous xanthate and possibly cupric xanthate as an adsorbed hydrophobic species. Xanthate adsorbed at ?0.1 V can be desorbed as the ethylxanthate ion at more negative potentials. The flotation response of chalcocite is also shown to parallel closely the adsorption of EtX? by reactions 3 and 4 and the reduction of the adsorbed product during cathodic decreases in potential.
CODEN
IJMPBL
Publication Date
19840101
Document Type
OP; Journal Article
Fiscal Year
1984
NTIS Accession No.
NTIS Price
Identifying No.
OP 7-84
Issue of Publication
1-3
ISSN
0301-7516
NIOSH Division
AVRC
Source Name
International Journal of Mineral Processing
State
MD
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