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Correlation of the Electrosorption of Sulfur and Thiol Collectors With Contact Angle and Flotation.

Walker-GW; Walters-CP; Richardson-PE
Proc Int Symp Electrochem in Min & Met Proc Electrochem Soc 1984 84-10:17 pages
The hydrophobic character of a variety of base-metal sulfides was examined in the presence of sodium hydrosulfide and potassium ethylxanthate. The magnitudes of hydrophobicity induced by electrodeposition of sulfur and by electrochemical reaction between the minerals and ethylxanthate were determined by contact angle measurements on polished surfaces and by flotation of mineral particles. During flotation, mineral-reagent interactions were followed by monitoring the solution composition spectrophotometrically. The results show that on gold and chalcopyrite the oxidation of hydrosulfide to sulfur and the oxidation of ethylxanthate to dixanthogen produced hydrophobic surfaces, while on pyrite, sulfur depositon was more effective than dixanthogen in producing a hydrophobic surface. Chalcocite, in contrast to gold, chalcopyrite, and pyrite, was found to react directly with ethylxanthate and hydrosulfide, but only the metal xanthate product was hydrophobic. Covellite, which is a possible product of the reaction between hydrosulfide and chalcocite, did not react with hydrosulfide but behaved more like a catalytic surface for the deposition of sulfur.
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OP 141-84
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Proc. Int. Symp. Electrochem. in Min. & Met. Proc., Electrochem. Soc., V.84-10, 1984, pp.202-218